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1
Hough, Julian. "Modelling incremental self-repair processing in dialogue". Thesis, Queen Mary, University of London, 2014. http://qmro.qmul.ac.uk/xmlui/handle/123456789/9094.
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Self-repairs, where speakers repeat themselves, reformulate or restart what they are saying, are pervasive in human dialogue. These phenomena provide a window into real-time human language processing. For explanatory adequacy, a model of dialogue must include mechanisms that account for them. Artificial dialogue agents also need this capability for more natural interaction with human users. This thesis investigates the structure of self-repair and its function in the incremental construction of meaning in interaction. A corpus study shows how the range of self-repairs seen in dialogue cannot be accounted for by looking at surface form alone. More particularly it analyses a string-alignment approach and shows how it is insufficient, provides requirements for a suitable model of incremental context and an ontology of self-repair function. An information-theoretic model is developed which addresses these issues along with a system that automatically detects self-repairs and edit terms on transcripts incrementally with minimal latency, achieving state-of-the-art results. Additionally it is shown to have practical use in the psychiatric domain. The thesis goes on to present a dialogue model to interpret and generate repaired utterances incrementally. When processing repaired rather than fluent utterances, it achieves the same degree of incremental interpretation and incremental representation. Practical implementation methods are presented for an existing dialogue system. Finally, a more pragmatically oriented approach is presented to model self-repairs in a psycholinguistically plausible way. This is achieved through extending the dialogue model to include a probabilistic semantic framework to perform incremental inference in a reference resolution domain. The thesis concludes that at least as fine-grained a model of context as word-by-word is required for realistic models of self-repair, and context must include linguistic action sequences and information update effects. The way dialogue participants process self-repairs to make inferences in real time, rather than filter out their disfluency effects, has been modelled formally and in practical systems.
2
Mujeeb, Ayeesha. "Self-assembled octapeptide gels for cartilage repair". Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/selfassembled-octapeptide-gels-for-cartilage-repair(ce161da3-4ce4-4d42-b0cc-6933fc6aa394).html.
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Molecular self-assembly provides a simple and efficient route of constructing well-defined nanostructures which may serve as extra cellular matrix (ECM) mimics. This work focuses on two specific octapeptides: FEFEFKFK and FEFKFEFK (F: phenylalanine, E: glutamic acid, K: lysine) with alternating charge distribution. The peptides were shown to self-assemble in solution and form β-sheet rich nanofibres which, above a critical gelation concentration (CGC), entangle to form self-supporting hydrogels. The fibre morphology of the hydrogels was analysed using TEM and Cryo-SEM illustrating the dense fibrillar network of nanometer size fibres. Oscillatory rheology results showed that the hydrogels possesses viscoelastic properties. By varying peptide concentration and type hydrogel stiffness, viscosity, water content, fibre density and other mechanical properties were tailored to control cell interactions and subsequent tissue growth. Bovine chondrocytes were used to assess the biocompatibility of these novel scaffolds over 21 days under 2D and 3D cell culture conditions, particularly looking into cell morphology, proliferation and matrix deposition. 2D culture resulted in cell viability and collagen type I deposition. In 3D culture, the mechanically stable gel was shown to support viability, retention of cell morphology and collagen type II deposition. Subsequently, the scaffold may serve as a template for cartilage repair. In addition, this research also focused on developing novel injectable scaffold design with in situ gelation properties to encapsulate chondrocytes for cell culture applications.
3
Xiong, Xingguo. "Built-in self-tTest and self-repair for capacitive mems devices". Cincinnati, Ohio : University of Cincinnati, 2005. http://www.ohiolink.edu/etd/view.cgi?acc%5Fnum=ucin1123038236.
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Thesis (Ph. D.)--University of Cincinnati, 2006.Title from electronic thesis title page (viewed Mar. 28, 2006). Includes abstract. Keywords: Microelectromechanical System (MEMS); Built-in Self-test (BIST); Built-in Self-repair (BISR); Yield Analysis; Reliability. Includes bibliographical references.
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XIONG, XINGGUO. "BUILT-IN SELF-TEST AND SELF-REPAIR FOR CAPACITIVE MEMS DEVICES". University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1123038236.
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Warren, James Phillip. "Self-assembling peptide hydrogels for articular cartilage repair". Thesis, University of Leeds, 2017. http://etheses.whiterose.ac.uk/17538/.
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Osteoarthritis affects millions of people globally, with damage to articular cartilage causing pain and altered mechanics during articulation. The treatment for late stage osteoarthritis is surgical intervention ultimately leading to total joint replacements. These treatments are not ideal for younger or more active patients so there is a clinical need for an early stage intervention treatment to reduce or stop the progression of osteoarthritis. It has been reported that there is a correlation between the loss of glycosaminoglycans (GAGs) from within osteoarthritic cartilage and the changes in biomechanics of the cartilage. It is hypothesized that the re-introduction of GAGs into early stage osteoarthritic cartilage through the use of permanent linkage and integration into a self-assembling peptide hydrogel matrix which could penetrate the cartilage tissue would potentially restore the resistance to deformation observed in osteoarthritic cartilage. Initially, synthetic self-assembling peptide-chondroitin sulfate (CS) conjugates were synthesized through utilizing copper-catalyzed click chemistry and subsequently characterized. The chosen peptide-CS conjugates were then incorporated into self-assembling peptide hydrogels and the morphologies and gel properties were investigated and evaluated in terms of the closest resemblance to the natural properties of the surrounding cartilage into which the hydrogels would be eventually injected. The best hydrogel candidates were then taken forward to be injected into a GAG depleted early stage osteoarthritic porcine cartilage model developed by Andres Barco (University of Leeds) where a severely GAG depleted state had been produced through a succession of surfactant and phosphate buffered saline washes. The hydrogels were doped with fluorescently labelled material which integrated into the hydrogel matrix, then injected into the cartilage tissue in a monomeric state. The hydrogels then self-assembled in situ and the deformation of the tissue was measured through creep indentation. The introduction of the peptide-CS conjugate showed significant restoration of resistance to deformation.
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Jones, Joshua K. "Empirically-based self-diagnosis and repair of domain knowledge". Diss., Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/33931.
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In this work, I view incremental experiential learning in intelligent software agents as progressive agent self-adaptation. When an agent produces an incorrect behavior, then it may reflect on, and thus diagnose and repair, the reasoning and knowledge that produced the incorrect behavior. In particular, I focus on the self-diagnosis and self-repair of an agent's domain knowledge. The implementation of systems with the capability to self-diagnose and self-repair involves building both reasoning processes capable of such learning and knowledge representations capable of supporting those reasoning processes. The core issue my dissertation addresses is: what kind of metaknowledge (knowledge about knowledge) may enable the agent to diagnose faults in its domain knowledge? In providing a solution to this issue, the central contribution of this research is a theory of the kind of metaknowledge that enables a system to reason about and adapt its conceptual knowledge. For this purpose, I propose a representation that explicitly encodes metaknowledge in the form of procedures called Empirical Verification Procedures (EVPs). In the proposed knowledge representation, an EVP is associated with each concept within the agent's domain knowledge. Each EVP explicitly semantically grounds the associated concept in the agent's perception, and can thus be used as a test to determine the validity of knowledge of that concept during diagnosis.
I present the formal and empirical evaluation of a system, Augur, that makes use of EVP metaknowledge to adapt its own domain knowledge in the context of a particular subclass of classification problem that I call compositional classification, in which the overall classification task can be broken into a hierarchically organized set of subtasks. I hypothesize that EVP metaknowledge will enable a system to automatically adapt its knowledge in two ways: first, by adjusting the ways that inputs are categorized by a concept, in accordance with semantics fixed by an associated EVP; and second, by adjusting the semantics of concepts themselves when they fail to contribute appropriately to system goals. The latter adaptation is realized by altering the EVP associated with the concept in question. I further hypothesize that the semantic grounding of domain concepts in perception through the use of EVPs will increase the generalization power of a learner that operates over those concepts, and thus make learning more efficient. Beyond the support of these hypotheses, I also present results pertinent to the understanding of learning in compositional classification settings using structured knowledge representations.
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Klement, Petr. "Analýza implementace projektu Customer Self-Repair ve společnosti HP". Master's thesis, Vysoká škola ekonomická v Praze, 2008. http://www.nusl.cz/ntk/nusl-17382.
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The aim of this diploma paper is to analyze the Customer Self-Repair project in Hewlett-Packard especially from costs and savings point of view that can be expected after the implementation of procedural changes that had to be made in the course of the project, while also indicate where mistakes were made from the perspective of project management and make suggestions on possible improvements in the future. The theoretical and methodological part is summed up a general theory concerning the problems of project management. The third chapter focuses on the practices of project management in the company, the definition stage the project should undergo and the criteria that should meet in order to pass the approval process. In the analysis of the project itself is captured the service model for the repairs of personal computers in the Europe, Middle East and Africa region. Than identification of error and procedural complications that occurred during the project. . At the end of this chapter is an analysis of actual savings and costs that can be realistically expected in the closing phase of the project. The last chapter contains a summary and suggestions for management of future projects in the company.
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Blackley, William Sinclair. "Self test and self repair strategies in VLSI architectures for high speed digital correlation". Thesis, University of Edinburgh, 1985. http://hdl.handle.net/1842/14106.
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Sarrazin, John Cody. "Ultrasonic repair of polymers fundamentals and modeling for self-healing /". Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/sarrazin/SarrazinJ0509.pdf.
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Although current research focuses within self-healing materials are advancing, most pursuits are passive systems, unlike the active biological systems they aim to mimic. In this paper an active method utilizing ultrasonic energy is explored. Ultrasonic inspection has served as an effective means toward nondestructive damage detection for decades. Also, a recent method called time-reversed acoustics allows for the redirection of acoustic waves back towards the source. The active healing method utilizes ultrasonic nondestructive damage detection to locate and categorize damage, and then provide coordinates for the redirection of an amplified ultrasonic energy to heal the material. First, the temperature change as a result of ultrasonic treatment was measured, and then a variety of dogbone samples were tensile tested, including virgin samples, damaged samples, and damaged but ultrasonically treated dogbone samples. The ultrasonic treatment increased the ultimate stress of the ultrasonically treated dogbone samples, which was a result of increased crystallinity. The crystallinity was confirmed with differential thermal analyses. The ultrasonic influence of material temperature and effect of ultrasonically treated damaged samples versus just untreated damaged samples were replicated with finite element models as a means to predict future application and use.
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Porter, Barry Francis. "An approach to generalising the self-repair of overlay networks". Thesis, Lancaster University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.507297.
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Pang, Jody Wing Chung. "Development and evaluation of self-repair concepts for composite materials". Thesis, University of Bristol, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419208.
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Lemon, Christopher Shandon. "Self-repair of actions in German: a case for embedded". Kansas State University, 2011. http://hdl.handle.net/2097/13126.
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Master of ArtsDepartment of Modern Languages
Emma Betz
Using conversation analytic methodology, this paper examines the self-repair of actions in everyday German conversation, with focus given to the replacement of verbs and the subsequent effect on actions. While study has been done on the function of recycling repair within a turn (Fox, Hayashi, Jesperson, 1996) no research has been done on the function of verb replacement and its effect on talk. This paper shows that verb replacement is a strategy employed by speakers in order to either a) negotiate what type of action is preferred within a particular TCU or b) to invoke external forces to either deflect an action, or to make a particular action available to an interlocutor. This paper concludes by discussing the specific function of this particular type of repair and how it is useful in repairing problematic actions.
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Rangel-Studer, Beatriz. "Self-repair in second language interaction: Dyad groups in action". CSUSB ScholarWorks, 2006. https://scholarworks.lib.csusb.edu/etd-project/2975.
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Describes the results of a research project that analyzes the interaction of a second language (L2) learners of English (non-native speakers (NNS)) with a native speakers (NS). The subjects of the study were four NNS and two NS of English at Imperial Valley College in Imperial, California. The first aspect of the analysis determines the way in which self-repair might be related to L2 development and the L2 learner's language proficiency level. The second aspect of the analysis determines whether the NNS use self-repair differently when the interlocutor is a NS or a NNS of English. Results of the study indicate that while there was not a correlation between overall frequency of self-repair and language proficiency, there was a relationship between frequency of particular types of repair and language proficiency.
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Garrett-Peters, Raymond. ""Coping with Unemployment: Self-Concept Repair by Displaced Managers and Professionals"". NCSU, 2005. http://www.lib.ncsu.edu/theses/available/etd-12282005-041437/.
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Research on unemployment among managers and professionals has documented the experience of job loss as stressful not only because of economic strain, but because of the damage it does to valued identities and self-conceptions. Little research, however, has examined the processes through which displaced workers collectively attempt to repair this damage. Data from participant observation in four support groups for displaced managers and professionals, plus intensive interviews with twenty-two group members, are used to develop an analysis of the self-concept repair strategies used by these relatively privileged workers. Four main strategies are identified: (a) redefining the meaning of unemployment; (b) realizing accomplishment; (c) restructuring time and activities; and (d) helping others. These strategies are argued to be oriented toward bolstering feelings of self-efficacy damaged by job loss and prolonged unemployment. The analysis shows how these self-concept repair strategies depended upon resources not readily available to blue-collar workers. Also considered are the implications of these strategies for the reproduction of class advantage and for the political mobilization of professional/managerial workers in response to recession and mass unemployment.
15
Ottery, Peter. "Using differential adhesion to control self-assembly and self-repair of collections of modular mobile robots". Thesis, University of Edinburgh, 2006. http://hdl.handle.net/1842/1396.
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This thesis presents a novel distributed control method which allows a collection of independently mobile robotic units, with two or three dimensional movement, to self-assemble into self-repairing hierarchical structures. The proposed method utilises a simple model of the cellular adhesion mechanisms observed in biological cells, allowing the robotic units to form virtually bonded aggregates which behave as predicted by Steinberg’s differential adhesion hypothesis. Simulated robotic units based on the design of the subaquatic HYDRON module are introduced as a possible platform on which the model can be implemented. The units are used to carry out a detailed investigation of the model behaviour and parameter space focusing on the two main tasks of rounding and sorting in both two and three dimensions. These tasks assess the model’s ability to reach a thermodynamically stable configuration when the aggregates consist of either a single population of units or multiple populations of units with differing adhesive properties. The results are analysed in detail with particular attention given to the role of random movements in determining the overall performance, and demonstrate that this model provides a very robust solution to these complex tasks. Finally, a possible extension of this work is presented in which the original model is combined with a genetic regulatory network controller. The performance of this composite is evaluated, and the benefits of this hybrid approach, in which a powerful control system manipulates a robust self-organising behaviour, are discussed.
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Feltner, Eleanor M. "The Use of Gesture in Self-Initiated Self-Repair Sequences by Persons with Non-Fluent Aphasia". UKnowledge, 2016. http://uknowledge.uky.edu/ltt_etds/14.
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This study examines the relationship between types of gestures and instances of self-initiated self-repair (SISR) used by persons with non-fluent aphasia (NFA), which is a type of aphasia characterized by stilted speech or signing (Papathanasiou et al., 2013), in interactions with clinicians. Conversation repairs in this study are assessed using the framework of Conversation Analysis (CA), which is an approach for describing, analyzing, and understanding social interaction (Sidnell, 2010). Previous linguistic studies have demonstrated a distinct preference for the use of gesture during a repair by persons with aphasia (Goodwin, 1995; Klippi, 2015; Wilkinson, 2013). This study draws more conclusive generalizations than previous studies about the types of gesture used in successful and unsuccessful SISR by persons with NFA through the use of the AphasiaBank corpus. Results show that there does not appear to be a connection between the overall frequencies of gesture used by persons with NFA during a phase of the repair mechanism as compared to other phases in the repair mechanism. Additionally, there is a slight tendency in this dataset for persons with NFA to have more successful repairs when they use gesture during the initiation and reparable portions of the repair mechanism.
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Kassimi, Fodhil. "Development and performance of fiber-reinforced self-consolidating concrete for repair applications". Thèse, Université de Sherbrooke, 2013. http://hdl.handle.net/11143/6636.
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Abstract: The use of self-consolidating concrete (SCC) in the concrete industry in cast-in-place applications, including repair applications, is growing given the various advantages offered in both fresh and hardened states. The present study deals with the design and performance of fiber-reinforced self-consolidating concrete (FR-SCC) as a repair material of concrete infrastructure. The study also considers the use of various steel and synthetic fibers (five fibers in total) that were used to produce FR-SCC and fiber-reinforced self-consolidating mortar (FR-SCM) that can be employed for structural and non-structural repair applications. The study evaluates the effect of material properties and mixture composition of the fibrous concrete and mortar on workability, mechanical, visco-elastic, durability, and structural behavior. The investigation that is presented in this thesis included the testing of 28 full-scale beams under four-point flexural loading. The majority of these beams were repaired by casting concrete to fill a relatively thin section along the tension zone of the beams. The repair technique was based on the FR-SCC characteristics including the maximum fiber volume and length. This technique required mixtures of high range of fluidity. The optimized FR-SCC and FR-SCM mixtures exhibited excellent flow characteristics along the 3.2-m long beams without blockage, segregation, nor debonding at the interface of repair-substrate concrete. Based on the structural characteristics of the composite beams, the overall performance of the beams repaired using the FR-SCC and FR-SCM was similar or higher (up to 2.6 times) than that of monolithic beams made with conventional vibrated concrete (CVC). The use of optimized FRSCC mixtures enabled the replacement of 50% of the tension steel reinforcement in repair sections; i.e., the number of bars in the tension zone decreased from three bars to two bars with the addition of fibers in the SCC without mitigating structural performance. The degree of prediction of crack width, cracking load/moment, ultimate loads, and deflection of various FR-SCC and FR-SCM mixture was evaluated using several design and code models. The results indicate that these code models can provide safe predictions for crack and ultimate loads, as well as crack width of FR-SCC. The deflection of FR-SCC is unsafe but predictable by these code models. In total, 18 large-scale beams were tested in four-point for flexural creep. FR-SCC incorporating steel fibers combined with expansive agent provided overall performance up to 10 times of that obtained with CVC with the same fiber type and volume. The cracking under constant load was reduced by 60% to 80% using self-consolidating fibrous mixtures made with or without expansion agents, compared to SCC without fibers. The best combination to reduce the cracking potential when the restrained shrinkage ring test was employed was obtained with SCC mixtures made with steel fibers and expansive agent. Models were elaborated to predict the time-to-cracking for FR-SCC and FR-SCM mixtures based on mixture modulus of elasticity and drying and autogenous shrinkages. The project involved extensive testing of highly flowable fibrous materials to determine drying shrinkage (nearly 260 prisms), modulus of rupture (nearly 180 prisms), as well as compressive and splitting tensile strengths and elastic modulus (nearly 2100 cylinders). Based on the results, models were proposed to predict these key material properties that affect the performance of FR-SCC and FR-SCM used in repair applications. In addition to FR-SCC, the investigation also was set to evaluate the feasibility of using fiber-reinforced superworkable concrete (FR-SWC) in construction and repair applications. Such highly flowable concrete that requires limited vibration consolidation can represent some advantages over FR-SCC (lower admixtures demand, lower risk of segregation, greater robustness, lower formwork pressure, etc.). The energy needed to ensure proper consolidation, using either vibration or rodding, applied on samples made with FR-SWC was determined. The energy requirement took into consideration the development of mechanical properties, the resistance to segregation, and the development of proper surface quality. The study also demonstrated the higher overall structural performance of optimized FR-SWC compared to the corresponding FR-SCC mixtures. The findings of the thesis on the design and performance of highly workable fiber-reinforced cementitious materials should facilitate the acceptance of such novel high-performance material in infrastructure construction and repair applications. // Résumé: L'utilisation du béton autoplaçant (BAP) dans l'industrie du béton dans les applications du coulage sur place incluant les applications de la réparation, est en croissance vu les divers avantages offerts à l'état frais et à l'état durci. La présente étude traite de la conception et la performance des bétons autoplaçants fibrés (BAPF) en tant que matériau de réparation des infrastructures en béton. L'étude considère également l'usage de différentes fibres métalliques et synthétiques (cinq fibres au total) qui ont été utilisées pour produire des BAPF et des mortiers autoplaçants fibrés (MAPF) pour des applications de réparations structurales et non structurales. L'étude évalue l'effet des propriétés du matériau et la composition des bétons et mortiers fibrés sur l'ouvrabilité, les propriétés mécaniques, viscoélastiques, de durabilité et le comportement structural. L'étude présentée dans cette thèse a inclus 28 poutres à grande échelle testées sous un chargement flexionnel à quatre points. La majorité de ces poutres a été réparée par le coulage du béton pour remplir une section relativement mince tout au long de la zone tendue des poutres. La technique de réparation a été basée sur les caractéristiques des BAPF incluant le volume maximal et la longueur maximale de fibres. Cette technique a requis des mélanges de haut niveau de fluidité. Les BAPF et MAPF ont exhibé d'excellentes caractéristiques d'écoulement le long de 3,2 m, la longueur de la poutre, sans blocage, ségrégation, ni décollement à l'interface entre le béton de base et le béton de réparation. En se basant sur les caractéristiques structurales des poutres composites, la performance globale des poutres réparées en utilisant les BAPF et les MAPF était similaire ou supérieure (jusqu'à 2,6 fois) que celle des poutres monolithiques fabriquées d'un béton conventionnel vibré (BCV). L'utilisation des mélanges de BAPF optimisés a permis de remplacer 50% du ferraillage tendu dans les sections de réparation; c'est-à-dire que le nombre des barres d'armatures dans la zone tendue a réduit de trois barres à deux barres avec l'addition de fibres dans le BAP sans mitiger la performance structurale. Le degré de prédiction de la largeur de fissures, charge de fissuration, charge ultime et déflexion de différents mélanges de BAPF et MAPF a été évalué en utilisant quelques designs et modèles de codes. Les résultats ont montré que ces modèles ont pu fournir de prédictions sécuritaires pour les charges de fissuration et ultime, ainsi que la fissuration des BAPF. La déflexion des BAPF est non sécuritaire mais reste prédictible par ces modèles de codes. En total, 18 poutres à grande échelle ont été testées en fluage flexionnel de quatre points. Des BAPF contenant des fibres métalliques combinées avec un agent expansif ont fourni une performance globale jusqu'à 10 fois celle obtenue avec un BCV contenant le même type et volume de fibres. La fissuration sous une charge constante a été réduite de 60% à 80% en utilisant des mélanges autoplaçants fibrés fabriqués avec ou sans agents expansifs, par rapport au BAP sans fibres. La meilleure combinaison pour réduire le potentiel de fissuration avec l'essai du retrait restreint a été obtenue avec des mélanges de BAP contenant de fibres d'acier et un agent expansif. Des modèles ont été élaborés pour prédire le temps de fissuration des mélanges de BAPF et MAPF basés sur le module d'élasticité du mélange et les retraits de séchage et endogène. Le projet comportait de nombreux essais sur les mélanges fibrés de haute fluidité à savoir la détermination du retrait de séchage (près de 260 prismes), le module de rupture (près de 180 prismes), ainsi que la résistance en compression, la résistance en traction et le module d'élasticité (plus de 2100 cylindres). En se basant sur les résultats, des modèles ont été proposés pour prédire ces propriétés clés qui affectent la performance des BAPF et MAPF destinés aux applications de réparation. En plus des BAPF, l'étude a aussi été faite pour évaluer la faisabilité de l'utilisation des bétons semi-fluides fibrés (BSFF) dans les applications de construction et de réparation. Tels bétons de haute fluidité requérant une consolidation limitée peuvent présenter certains avantages par rapport aux BAPF (plus faible demande en adjuvants, plus faible risque de ségrégation, robustesse supérieure, plus faible pression sur les coffrages, etc.). L'énergie nécessaire pour assurer une propre consolidation, en utilisant soit la vibration ou le piquage, appliquée sur des échantillons de BSFF a été déterminée. Les exigences de cette énergie considèrent le développement des propriétés mécaniques, la résistance à la ségrégation et la propre qualité de surface. L'étude a aussi démontré une performance structurale globale supérieure des BSFF optimisés par rapport aux mélanges de BAPF correspondant. Les conclusions de la thèse sur le design et la performance des matériaux cimentaires renforcés de fibres et de haute fluidité devraient faciliter l'acceptation de tels nouveaux matériaux de haute performance dans les applications de la construction et la réparation des infrastructures.
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Georgiadou, Effrosyni S. "Working memory, aspects of oral production and self-repair behaviour in L2". Thesis, University of Essex, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.654558.
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This study explored the relationship of complex working memory (WM) and phonological short-term memory (PSTM) to aspects of second language (L2) oral production and self-repair behaviour. The study drew on Levelt's (1989; 1983) model of speech and perceptual loop theory of monitoring while the concept of WM was based on Baddeley and Hitch's (1974) multicomponent model of WM. Complex WM refers to the cognitive capacity of simultaneous storage and processing of information while PSTM refers to the capacity of the phonological store. The participants were 84 Emirati female university students learning English in an intensive language program in Abu Dhabi. It was hypothesised that given the limited automaticity of the language building processes in less advanced EFL learners, and thus the dependence of these processes on attentional resources, speakers with higher WM and PSTM scores would perform better in terms of fluency, accuracy, lexical and syntactic complexity in a task with simultaneous online planning. In addition, a relationship of WM with the number and the types of overt self-repairs was anticipated based on the attentional demands of the monitoring processes. Complex WM was measured with a backward digit span test in patticipants' Ll and a listening span test in L2. Phonological STM was measured with a simple word-recall test in L2. Statistical analysis of the data showed a relationship of complex WM with disfluency and general grammatical accuracy, while PSTM correlated significantly with speech rate, general and specific measures of grammatical accuracy as well as lexical variety. Complex WM and PSTM were also found to correlate moderately with overall oral performance scores. No statistically significant results emerged between complex WM, PSTM and number of self-repairs, but there was a significant negative correlation between PSTM and phonological error-repairs. Overall, the findings support that WM contributes to variation in L2 oral production but not overt self-repair behaviour.
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Rizzo, Paola. "Cellular mechanisms underlying the ACE inhibitor capacity to stimulate kidney self-repair". Thesis, Open University, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.664521.
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Bowman's capsule parietal epithelial cell activation occurs in several human proliferative glomerulonephritides. The cellular composition of the resulting crescentic lesions is controversial, although a population of renal progenitor cells, which in adult healthy kidney contributes to the physiological cell turnover, has been proposed to be a major constituent. In this study we try to get light into the mediators involved in the aberrant progenitor cell proliferation and migration into the Bowman's space, which occurs in presence of an extended glomerular injury. To this aim, we studied 36 renal biopsies of patients with proliferative and non proliferative glomerulopathies. In parallel, we also analyzed the Munich Wistar Fromter rats with proliferative glomerulonephritis, characterizing for the first time a population of renal progenitor cells also in rodents. We demonstrated that dysregulated progenitor cells of the Bowman's capsule invade the glomerular tuft exclusively in proliferative disorders. In both humans and rats, up-regulation . of the CXCR4 chemokine receptor on progenitor cells was accompanied by high expression of its ligand, stromal-derived factor-1 (SDF-1) in podocytes. Parietal epithelial cell proliferation might be sustained by increased expression of the angiotensinII type1 (AT1) receptor. Treatment with the antihypertensive drug angiotensin-converting enzyme (ACE) inhibitor, reduces the number and the extension of crescents, limiting progenitor cell proliferation and migration. Moreover, ACE inhibitor normalized the expression of CXCR4, SDF-1 and ATl receptor on progenitor cells. These results suggest that glomerular crescents derive from the proliferation and migration of renal progenitors in response to injured podocytes. The SDF-1/CXCR4 axis, together with the AngII/ ATl receptor pathway, contributes to the dysregulated response of renal progenitors. Targeting the AngII/ AT1/ CXCR4 pathway may be beneficial in severe forms of glomerular proliferative disorders.
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Divband, Soorati Mohammad [Verfasser], Heiko [Akademischer Betreuer] Hamann i Mammen Sebastian [Akademischer Betreuer] von. "Adaptivity and self-repair in robot self-assembly / Mohammad Divband Soorati ; Akademische Betreuer: Heiko Hamann, Sebastian von Mammen". Lübeck : Zentrale Hochschulbibliothek Lübeck, 2020. http://d-nb.info/1215381301/34.
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Fincher, Amanda, i n/a. "Functions of Self-Initiated Self-Repairs in an Advanced Japanese Language Classroom". Griffith University. School of Education and Professional Studies, 2007. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20080613.161329.
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In the current research project the functions of self-initiated self-repairs in an advanced Japanese language classroom were investigated. From the reviewed literature it was found that repairing is possible through monitoring, which includes error detection, and involves attention and memory. Therefore, data was collected on the abilities of the participants in the current research project to repair, monitor and their attention levels and memory. There were seven methods used to collect data; participant observation, classroom interaction tape recordings, a questionnaire, stimulated recall interviews, attention test, memory and attention test and proficiency level assessments. From the participant observation, classroom interaction tape recordings and stimulated recall interviews data was collected on the repairs that the participants made and the way in which they monitored was explored. The questionnaire revealed relevant background information, such as, number of years the participants had studied Japanese, which supplemented other information collected. The attention test and memory and attention tests were used to obtain information on the participants perceptions of their levels of attention and their actual levels of attention and memory respectively. The final data collected was on the participants own perceptions of their speaking proficiency levels in Japanese and an independent judges evaluation of their levels. The results of the data collected on the way in which the participants repaired and monitored showed that overall the participants repaired and monitored in ways that had been discussed in previous research on repairing and monitoring. However, for the first known time, phenomena related to repairing and monitoring, which the researcher terms as communication strategies, are used frequently by the participants and also, that these communication strategies used and repairs made by the participants were not needed to be made. In other words, the participants in the current research project were often repairing errors that had not been made. As for the data collected on the participants attention levels and memory, no significant differences were found between the participants and neither did any differences reflect on the ways in which the participants repaired. From the proficiency level assessments, further evidence was found that supported previous research done on repairing and monitoring as well. Also, it was found that the participants under-estimated their levels of proficiency in comparison to the independent judges evaluations. Therefore, the participants both over repair and under estimate their Japanese speaking abilities. This is seen as detrimental to the participants performances in Japanese. Recommendations are made to use this data provided by Japanese language learners when repairing to guide instruction and to encourage learners to gain fluency by repairing less often than is thought necessary.
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Fincher, Amanda. "Functions of Self-Initiated Self-Repairs in an Advanced Japanese Language Classroom". Thesis, Griffith University, 2007. http://hdl.handle.net/10072/365758.
Pełny tekst źródłaStreszczenie:
In the current research project the functions of self-initiated self-repairs in an advanced Japanese language classroom were investigated. From the reviewed literature it was found that repairing is possible through monitoring, which includes error detection, and involves attention and memory. Therefore, data was collected on the abilities of the participants in the current research project to repair, monitor and their attention levels and memory. There were seven methods used to collect data; participant observation, classroom interaction tape recordings, a questionnaire, stimulated recall interviews, attention test, memory and attention test and proficiency level assessments. From the participant observation, classroom interaction tape recordings and stimulated recall interviews data was collected on the repairs that the participants made and the way in which they monitored was explored. The questionnaire revealed relevant background information, such as, number of years the participants had studied Japanese, which supplemented other information collected. The attention test and memory and attention tests were used to obtain information on the participants’ perceptions of their levels of attention and their actual levels of attention and memory respectively. The final data collected was on the participants’ own perceptions of their speaking proficiency levels in Japanese and an independent judge’s evaluation of their levels. The results of the data collected on the way in which the participants repaired and monitored showed that overall the participants repaired and monitored in ways that had been discussed in previous research on repairing and monitoring. However, for the first known time, phenomena related to repairing and monitoring, which the researcher terms as communication strategies, are used frequently by the participants and also, that these communication strategies used and repairs made by the participants were not needed to be made. In other words, the participants in the current research project were often repairing errors that had not been made. As for the data collected on the participants’ attention levels and memory, no significant differences were found between the participants and neither did any differences reflect on the ways in which the participants repaired. From the proficiency level assessments, further evidence was found that supported previous research done on repairing and monitoring as well. Also, it was found that the participants under-estimated their levels of proficiency in comparison to the independent judge’s evaluations. Therefore, the participants both over repair and under estimate their Japanese speaking abilities. This is seen as detrimental to the participants’ performances in Japanese. Recommendations are made to use this data provided by Japanese language learners when repairing to guide instruction and to encourage learners to gain fluency by repairing less often than is thought necessary.Thesis (Professional Doctorate)
Doctor of Education (EdD)
School of Education and Professional Studies
Faculty of Education
Full Text
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Boghossian, Ardemis A. (Ardemis Anoush). "An engineering analysis of natural and biomimetic self-repair processes for solar energy harvesting". Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/76478.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 2012.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 191-201).
Plants have evolved highly sophisticated mechanisms of self-repair to regenerate proteins that become photo-damaged over time. Key to this self-repair process is the reversible self-assembly of protein complexes, which is characterized by the molecular recognition of parts, kinetic trapping of meta-stable thermodynamic states, and chemical signaling to switch between states. In this thesis, we mimic such regenerative mechanisms in an effort to develop biological light-harvesting devices with prolonged lifetimes. We demonstrate the first synthetic photoelectrochemical cell capable of mimicking key aspects of the self-repair process. Surfactant addition and removal was used to signal between the disassembly and re-assembly of a photoactive complex demonstrating photo-conversion efficiencies of 40%. These dynamic complexes consist of lipid bilayer disks housing photoactive reaction centers (RCs) that align along the length of a single-walled carbon nanotube (SWNT). Application of a regeneration cycle that reversibly signals between the assembled and disassembled states extends the lifetime of the photoelectrochemical cell indefinitely and increases cell efficiency by over 300% over 168 hours. We modeled the kinetic and thermodynamic forces that drive the reversible self-assembly, and we fit this model to spectrofluorimetric measurements that monitor complex formation. The bestfit rate constants for lipid bilayer and bilayer-nanotube complex formation are 79 mM-Is'Iand 5.4x 10 mM-1 s- 1, respectively. We find that these reactions do not occur under diffusioncontrolled conditions, and the phase diagram predicts a locally optimal surfactant removal rate of 8 x 10-4 s-1. This model was subsequently fit to cyclic complex assembly and disassembly measurements, demonstrating that the forces modeled in this study may form the basis for synthetic and natural photoactive complexes capable of dynamic component repair. In an effort to extend our scope to study natural regeneration mechanisms, we established a platform for quantifying reactive oxygen species (ROS) generation in isolated chloroplasts capable of autonomous regeneration. ROS generation from illuminated chloroplasts from S. oleracea was examined in the presence of dextran-wrapped nanoceria (dNC), cerium ions (Ce3 ), fullerenol, and DNA-wrapped SWNTs. ROS concentrations were evaluated using the oxidative dyes, 2',7'- dichlorodihydrofluorescein diacetate (H2DCF-DA) and 2,3-bis(2-methoxy-4-nitro-5- sulfophenyl)-2H-tetrazolium-5-carboxanilide sodium salt (XTT). Chloroplast photoactivity was monitored throughout the illumination period using chloroplast fluorescence and the artificial, photosynthetic electron accepting dye, dichloroindophenol (DCPIP). The results of this study indicate that dNC offers a promising mechanism for effective ROS scavenging whilst preserving chloroplast photoactivity at concentrations below 5 [tM. We have also established several platforms for studying the glucose production of isolated chloroplasts for biofuel cell applications. We developed an algorithm to quantify single-molecule efflux measurements from individual, photoactive chloroplasts. Near-infrared fluorescing SWNTs have been used in previous studies to report single-molecule binding events via stochastic fluctuations in fluorescence. In this thesis, we develop and compare several algorithms for extracting concentration-dependent rates from the stochastic fluctuations. Overall, the birthand- death model most accurately predicts the rate constants, whereas the moment analysis is more accurate at large forward rates (>10-3 s-1). Glucose efflux from chloroplasts was characterized using a glucose oxidase assay, high-pressure liquid chromatography (HPLC), and a biofuel cell. Calculated export rates of 1.9 and 6 tmol/(mg chlorophyll hr) were measured using the HPLC and fuel cell, respectively. Maximum power densities of 110 pW/cm 2 were achieved with alginate encapsulated chloroplasts. In the presence of regenerative materials, such as dNC, this biofuel cell setup provides a promising platform for demonstrating a biological lightharvesting construct capable of autonomous regeneration
by Ardemis A. Boghossian.
Ph.D.
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Konrad, Wilfried, Christoph Neinhuis i Anita Roth-Nebelsick. "Competition between diffusion and advection may mediate self-repair of wax microstructures on plant surfaces". Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-202156.
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Cuticles are extracellular membranes covering the primary aerial parts of vascular plants. They consist of a multifunctional polymeric
material with embedded soluble components, called waxes and serve as the interface between plants and their atmospheric environment,
first of all protecting them from desiccation. Waxes are produced within the epidermal cells, then transported to the leaf surface and finally
integrated into the polymer or deposited upon the cuticle.
Remarkably, damaged wax layers may become repaired within a few hours. Base on an earlier hypothesis we present a theoretical framework explaining how waxes are transported through the plant epidermis by a combination of advection and diffusion. This combination suggests also a self-regulating repair mechanism, based on the assumption that intact cuticles induce an antagonistic equilibrium between advection and diffusion: whenever a wax layer is damaged, the equilibrium is disturbed in favour of advection, starting a repair process, which is intrinsically coming to an end after the cuticle has gained its original thickness.
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Oko, Mambo-Matala Ngatye-Brian. "Ampiify : Opening oportunities on outdated electronics". Thesis, Umeå universitet, Institutionen Designhögskolan, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-57131.
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The disposal of electronic waste is becoming one of the growing problems that the planet is facing. Tons of electronic waste is dumped illegally to 3rd world countries. Consequently the local people in those countries are exposed to levels of toxicity that could cause them serious diseases as well as the degradation on the natural ecosystems. The electronic waste is perceived as useless by our society, and this project aims to challenge that idea by looking at sustainable ways of manipulating electronics.
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Blok, Sherry. "Read-aloud editing : how talking about writing pushes second language learners to self-and peer-repair". Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=98911.
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Read-aloud editing aims to engage both the reader and the writer to negotiate meaning and negotiate form with the aim to self- and peer-repair. This study was divided into a three-fold focus: (1) examining feedback types, (2) examining categories of repair and (3) examining patterns of dyadic interaction (Storch, 2002). Two read-aloud editing sessions of 15 intermediate-level adult English as a second language learners (ESL) were audio-recorded and transcribed for quantitative and qualitative analysis. The results reveal that reformulations as a feedback type led to more learner repairs, whereas prompts led to more "metatalk" (Swain, 1998). Peer readers initiated and repaired more than writers and errors pertaining to incorrect grammar form tended to be repaired over other types of errors. Social relationships between the peers changed depending on how learners assumed their roles in the pairs. The findings suggest that read-aloud editing helps learners notice incongruities in their writing and find solutions by talking about writing (Nystrand, 1986).
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Imperiale, Vita. "Design and formulation of a bespoke self-healing agent for repair of multifunctional fibre reinforced polymers". Thesis, University of Bristol, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.582821.
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The aim of this investigation was to design a bespoke self-healing agent (SHA) formulation in order to achieve a fully autonomous healing functionality, which provides effective and timely in-situ repair of FRP composite laminates. The preliminary phase of the design process consisted of the identification of the SHA requirements, the choice of epoxy resins as the most suitable chemistry and, finally, the selection of the best candidate species, amongst the many commercially available. Numerous formulations were then generated by the combination of the above components. Therefore, an initial downselection process, with chemical and physical properties characterisation was necessary to consider only a limited number of formulations for mechanical properties characterization. A Mode I fracture toughness test was considered as a means of final selection, the adhesive function being one of the most important functional requirements. Finally, the recovery of residual compressive strength after impact (CAI) was used as a validation method, which was able to demonstrate and quantify the self-healing recovery within a FRP laminate. A very low viscosity epoxy based formulation with a slightly higher fracture toughness than the host composite matrix and good degree of reactivity was selected as having the best overall performance. Adhesion, as a function of time and temperature, was further assessed in this formulation. It was demonstrated that a certain degree of load bearing ability can be achieved after limited reaction extent with full recovery of load bearing ability after 6 hours at 25°C. An ageing assessment of SHA demonstrated that after seven days exposure to 60°C the formulation possessed excellent adhesive properties. The novel integration of a two-part SHA, with the components segregated within different hollow glass fibres for a fully autonomous process, required the development of a suitable manufacturing and design of the FRP laminate. The damaged and self-healed samples achieved 93% of the strength relative to the initial pristine configuration. Besides an increase in the failure load, self-healing generated a significant change in the stress-strain characteristics, which restored a degree of linearity up to failure, and a reduction in the differential strains (and hence increased buckling resistance). The bleeding of the SHA from storage in the HGF to effect healing can be implied from ultrasonic C-scan analysis, where images of self- healing samples possessed fragmented and less defined delamination contours compared to the image of damaged samples without SHA within hollow glass fibres. This investigation has demonstrated that a fully autonomous recovery of a significant proportion of compressive strength in a CFRP is possible via self-healing. For the first time it has been demonstrated that a bespoke multi-component SHA is able to bleed from embedded HGF, self-mix and react to allow recovery of up to 93% of compressive strength, notwithstanding the presence of remaining damage within the CFRP laminate
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Gharaei, Robabeh. "Production and properties of fibre webs containing self-assembling peptides for promotion of hard tissue repair". Thesis, University of Leeds, 2017. http://etheses.whiterose.ac.uk/17304/.
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Self-assembling peptides (SAPs) have attracted interest due to their potential value in therapeutics. The 11-residue family of peptides (P11-X), are able to self-assemble hierarchically into β-sheet tapes with higher order structures (ribbons, fibrils and fibres) being produced depending on peptide concentration. Previous studies of P11-X peptides aimed at tissue repair focused on hydrogel formats where their potential for deposition of hard tissue minerals in vivo was demonstrated due in part to their ability to mimic the physiochemical properties of natural extracellular matrix (ECM) of bone. However, SAP hydrogels are often associated with inherently weak and transient mechanical properties, which make their handling and fixation challenging in large load-bearing tissue defects. Accordingly, to engineer a more robust scaffold, the present research demonstrates the feasibility of producing electrospun webs composed of a biodegradable polymer, poly (e-caprolactone) (PCL) commixed with either P11-4 (Ac-QQRFEWEFEQQ-Am) or P11-8 (Ac QQRFOWOFEQQ-Am) self-assembling peptides. Morphological features of the electrospun webs investigated via scanning and transmission electron microscopies (SEM and TEM) revealed that PCL/P11-4 and PCL/P11-8 electrospun webs contain fibres in both nano- (10–100 nm) and submicron ranges (100–700 nm), whereas PCL fibre webs, produce a predominantly submicron fibre distribution. Homogeneous distribution of SAPs within the electrospun fibres was revealed via confocal microscopy. . Furthermore, it was discovered by spectroscopic analysis that SAPs exist entirely in their monomeric state in the electrospinning solution, and convert from monomeric form to β-sheet secondary conformation when converted into fibres. PCL/SAP fibres were shown to exhibit enhanced hydrophilicity compared to PCL-only fibres, and induce no cytotoxic response when cultured with L929 mouse fibroblasts. A study of the release kinetics of SAP from PCL fibres II in simulated conditions of biological pH (neutral pH of 7.4) after 7 days revealed at least 75% of P11-4 and 45% of P11-8 still remained, suggesting potential for long-term therapeutic delivery. Finally the ability of SAP embedded PCL fibrous scaffold to nucleate and support growth of bone minerals was investigated using two in vitro assays, specifically the simulated body fluid (SBF) method and the in vitro nucleation (IVN) tank method. PCL/SAP fibres were found to nucleate and support spheroidal growth of hydroxyapatite crystals and were capable of comparable mineral nucleation performance as SAP hydrogels.
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Scheit, Daniel [Verfasser], i Heinrich Theodor [Akademischer Betreuer] Vierhaus. "Fault-tolerant integrated interconnections based on built-in self-repair and codes / Daniel Scheit. Betreuer: Heinrich Theodor Vierhaus". Cottbus : Universitätsbibliothek der BTU Cottbus, 2011. http://d-nb.info/1016457804/34.
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Rieger, Caroline Lea Anne Marie. "Self-repair strategies of English-German bilinguals in informal conversations, the role of language, gender, and linguistic proficiency". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ59662.pdf.
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Tatu, Rigwed R. "Development and Characterization of aPoly (l-lactic acid)/ Poly (e-caprolactone) Self-Expanding Patch forFetoscopic Repair of Myelomeningocele". University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535635832679162.
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Wiesener, Markus [Verfasser]. "Corrosion and self-repair studies of metal alloys and alloy coatings for applications in light-weight constructions / Markus Wiesener". Paderborn : Universitätsbibliothek, 2015. http://d-nb.info/1077247036/34.
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Mayen, Daniel. "Effect of various chemical admixtures and binder combinations of workability of high-performance, self-consolidating concrete used in repair". Mémoire, Université de Sherbrooke, 2005. http://savoirs.usherbrooke.ca/handle/11143/1273.
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Abstract : It is well known that the winter in Quebec is particularly harsh and poses high demand on concrete performance, especially that used in infrastructure applications. Government agencies, in charge of repair and rehabilitation of such infrastructure, must work to restore the concrete and to extend the lifetime of structures. The objective of this research is to develop high-performance, self-consolidating concrete intended for repair applications that will facilitate the casting of slim and highly reinforced sections while ensuring adequate durability and service life. The performance of fresh concrete made with several Chemical admixture and hydraulic binder combinations has been evaluated. In total, five different brands of admixtures along with four binder types were used in this investigation. Two different approaches were used in proportioning the concrete to ensure proper stability: the use of low water-cementitious ratio, or the use of a moderate water-cementitious ratio (w/cm) with a Viscosity-Enhancing Agent (VEA) to enhance cohesiveness. Optimized mixtures were assessed for key workability characteristics, including: static stability, dynamic stability, and rheological parameters. The mixtures had initial slump flow of 660 ± 20 mm and maximum surface settlement of 0.5%. Some mixtures were made with synthetic fibres and initial slump flow of 700 ± 20 mm. // Résumé : Il est bien connu que l’hiver québécois est particulièrement agressif pour les ouvrages en béton. Les organismes publics doivent de plus en plus compter avec des travaux de réfection afin de réparer les structures existantes pour en prolonger la durée de vie. Le but de cette recherche est de développer un béton autoplaçant destiné aux travaux de réparation qui puisse faciliter la construction d’ouvrages minces et fortement renforcés. Cinq différents adjuvants et quatre différents liants hydrauliques ont été utilisés pour la fabrication d’un tel béton autoplaçant. Deux différentes approches ont été utilisées : l’une avec un faible rapport eau/liant sans agent colloïdal et l’autre avec un rapport eau/liant modéré avec agent colloïdal. La stabilité dynamique, la stabilité statique et les paramètres rhéologiques ont été mesurés lors des différents essais. Les propriétés du béton autoplaçant incluaient un étalement de 660 ± 20 mm et une stabilité statique limitée à une valeur maximale de 0,5%, mesurée avec une colonne de tassement de 700 mm. Des fibres ont été incorporées au béton autoplaçant et ses propriétés ont été améliorées jusqu’à un étalement de 700 ± 20 mm.
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Torp, Løkkeberg Stine. "Risking the social bond when communicating unpleasant information : how self-relevant appraisals and feelings explain distancing and repair motivations". Thesis, University of Kent, 2016. https://kar.kent.ac.uk/60955/.
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This thesis focuses on the communication of unpleasant information in six experimental studies. Specifically, the experimental studies investigate how withholding and/or disclosing unpleasant information is appraised by the communicator in three various ways (degree of severity, concern for one's self-image and concern for one's social-image in the eyes of others), how these appraisals relate to three core feelings (felt rejection, felt inferiority and felt shame), and how these explain two main motivations (wanting to distance oneself from the other, wanting to repair the social bond with the other) across various social bonds (both private and professional). In the two first studies it was found that disclosing unpleasant information caused the communicator to report significantly less distress (lower levels of appraisals, feelings and motivations) compared to when the communicator withheld the unpleasant information. In studies three to six, it was found that, when communicators disclosed the unpleasant information, the prototypical communication strategy of being person-centred caused the communicator to feel significantly less distress (lower levels of appraisals, feelings and responses) than if two other prototypical ways of communicating were used (the fully direct strategy and the fully indirect strategy). In all six studies, I found that the motivation of wanting to distance oneself from the other was explained by a "concern for one's social-image → felt rejection" pathway, while the motivation to repair the social bond with the other was explained by a "concern for one's self-image → felt shame" pathway. The thesis argues the importance of disclosing the unpleasant information and of disclosing it in a person-centred way.
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Dufour, Alexandre. "Combination of self-assembling peptide hydrogel and autologous chondrocytes for cartilage repair : Preclinical study in a non-human primate model". Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1257.
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Le cartilage a une capacité de régénération très limitée car il n'est pas vascularisé. Laréparation de ce tissu est un défi et les techniques chirurgicales actuelles sont insatisfaisantes à longterme. Le cartilage est donc un bon candidat pour l'ingénierie tissulaire. La transplantation dechondrocytes autologues (TCA) a été la première thérapie cellulaire développée en rhumatologie maiscette procédure implique une amplification des cellules qui aboutit à une perte du phénotypechondrocytaire (perte de l'expression du collagène de type II, protéine majoritaire du cartilage), auprofit d'un phénotype fibroblastique (caractérisé par l'expression du collagène de type I, retrouvé dansles tissus fibreux). La TCA conduit donc à une greffe de chondrocytes dédifférenciés produisant unfibrocartilage, dont les propriétés mécaniques sont inférieures à celles du cartilage articulaire.Aujourd'hui, les agences de santé au niveau international s'accordent pour dire que cette procédurenécessite d'être améliorée, par un meilleur contrôle du phénotype cellulaire et l'utilisation debiomatériaux pour mieux combler les lésions articulaires. Il s'agit donc de passer de la thérapiecellulaire à l'ingénierie tissulaire du cartilage.L'objectif de nos travaux a été d'évaluer la capacité d'un gel innovant de peptides autoassemblants,l'hydrogel IEIK13, à jouer le rôle de support pour des chondrocytes humains afin qu'ilsproduisent une matrice cartilage sous l'action de facteurs chondrogéniques. L'objectif visé a été lacréation d'un gel cartilage implantable par arthroscopie. Le défi a été de surmonter la dédifférenciationdes chondrocytes inhérente à leur amplification et incontournable pour augmenter le réservoircellulaire. L'amplification de chondrocytes humains a été réalisée en présence de FGF-2 et d'insuline(cocktail FI) puis leur redifférenciation a été induite en gel IEIK13 sous l'action de BMP-2, d'insuline etd'hormone T3 (cocktail BIT). C'est la combinaison sélective des deux cocktails qui permet la séquencedédifférenciation-redifférenciation. Le phénotype des chondrocytes et la nature de la matriceextracellulaire synthétisée en gel ont été évalués dans un premier temps in vitro, par des analyses dePCR en temps réel, Western-blots et d'immunohistochimie. Dans un second temps, nous avonstransplanté le gel cartilage dans des lésions articulaires de genou d'un modèle original de primate nonhumain(singe cynomolgus), un type de gros animal dont la posture et le fonctionnement desarticulations s'apparentent à l'homme. Nos études d'imagerie non invasive (telle qu'elle est pratiquéechez l'homme) et immunohistochimiques trois mois après implantation montrent une réparationsatisfaisante des lésions, en comparaison avec les lésions laissées non comblées. L'ensemble de nosrésultats montre pour la première fois que l'hydrogel IEIK13 est un biomatériau favorable pourreconstruire le cartilage et que le primate non-humain est un modèle préclinique unique pour évaluerl'efficacité de l'ingénierie tissulaire du cartilageCartilage is not vascularized and presents poor capacity of self-regeneration. Repairing thistissue is a challenge and current surgical techniques are not satisfactory in the long term. Cartilage isthus a good candidate for tissue engineering. Autologous chondrocyte transplantation (ACT) was thefirst cell therapy developed for cartilage repair. This procedure implies amplification of cells whichresults in chondrocyte dedifferentiation (loss of expression of type II collagen, the major protein ofcartilage and acquisition of expression of type I collagen, the major protein found in fibrous tissues).Thus, ACT results in implantation of fibroblastic cells producing fibrocartilage with biomechanicalproperties inferior to native articular cartilage. The international health agencies agree that ACT needsto be improved with better control of the chondrocyte phenotype and use of biomaterials. Therefore,cell therapy of cartilage needs to move towards tissue engineering of cartilage.The objective of our study was to evaluate the capacity of an innovative self-assemblingpeptide (IEIK13) to support cartilage matrix production by human chondrocytes. Our goal was to createa cartilage gel that can be implanted by arthroscopy. A main challenge was to meet the problem ofchondrocyte dedifferentiation induced by cell amplification necessary to increase the cellularreservoir. Amplification of human chondrocytes was performed in the presence of FGF-2 and insulin(cocktail FI), and redifferentiation was subsequently induced in IEIK13 gel with BMP-2, insulin, andtriiodothyronine T3 (cocktail BIT). The specific combination of these two cocktails alloweddedifferentiation-redifferentiation of chondrocytes. The status of the chondrocyte phenotype and thenature of the extracellular matrix secreted in gel were first assessed in vitro by real-time PCR, Westernblottingand immunhostochemistry analyses. With a view of clinical application, we then transplantedIEIK13-engineered cartilages into defects created in knees of an original model of non-human primate(cynomolgus monkey), a type of large animal whose anatomy and biomechanics mimic human. Ournon-invasive imaging analyses and our inmmunohistochemical studies performed three months afterimplantation show correct reparation of the lesions, in comparison with the defects left untreated.Altogether, our results demonstrate for the first time that IEIK13 is a suitable biomaterial for cartilagerepair and that cynomolgus monkey represents a unique preclinical model to evaluate efficiency ofcartilage tissue engineering
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Saatchi, Sanaz 1980. "A novel osteochondral composite consisting of a self-assembling peptide hydrogel and 3D printed polycaprolactone scaffold : potential for articular cartilage repair". Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/17949.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004.Includes bibliographical references (p. 133-135).
Degenerative diseases, such as osteoarthritis, and traumatic injuries are both prominent causes of cartilage defects. Due to its avascular nature, adult human cartilage displays limited capacity for regeneration. Current surgical treatments to induce a spontaneous repair response rely on access to the subchondral bone region. These procedures result in fibrocartilage generation, as opposed to hyaline cartilage, that is variable in structure, composition, and durability. Furthermore, the success rates of these surgeries are also variable. Deficiencies in these cartilage repair methods motivate investigation into a tissue engineering means of repairing or regenerating cartilage. Various composites designed to emulate a cartilage and bone interface are under investigation. The aim of this study was to conceive a means of integrating a chondrocyte-seeded peptide hydrogel with an interconnected porous 3D printed polycaprolactone (PCL) scaffold to create a novel osteochondral construct. The self-assembling peptide hydrogel has been shown to provide an environment that maintains chondrocyte phenotype and viability. Furthermore, the 3D scaffold fosters extracellular matrix production and chondrocyte division. PCL is a bioresorbable and biocompatible polymer scaffold, capable of supporting the attachment of both osteogenic and chondrogenic cells and cell-specific extracellular matrix production, that can be integrated with the peptide hydrogel to constitute an osteochondral construct. A primary advantage of the 3D printing technology is the ability to control the microarchitecture and macroarchitecture of the PCL scaffold in a layer by layer fashion. Integration of the peptide hydrogel into the porous PCL scaffold may be enhanced by creating a gradient of porosity
(cont.) at the interface of the materials, while the lower portion of the PCL scaffold would possess a scaffold microarchitecture optimized for bone ingrowth. Through the use of an agarose mold, the construction of an osteochondral composite consisting of the chondrocyte-seeded peptide hydrogel and porous PCL scaffold was made possible in an integrated, controlled, and repeatable fashion. PCL was found to act as an inert material with regard to chondrocyte behavior, as chondrocyte morphology, viability, extracellular matrix production, and biosynthesis rates proved to be analogous to those seen in the chondrocyte-seeded peptide hydrogel only systems previously studied. A distinction in the microarchitecture of the PCL scaffold, 70% porosity versus 90% porosity, was not found to markedly impact chondrocyte behavior in the peptide hydrogel. The efficacy of the peptide hydrogel material selection was illustrated by comparison to a chondrocyte-seeded agarose hydrogel and PCL composite, with an agarose hydrogel serving as a more traditional means of studying chondrocyte behavior. Biochemical, mechanical, and histological characterization of the peptide hydrogel and porous PCL construct delineate the potential use of this composite for osteochondral defect repair. Future studies may involve dynamic compression of the composite to stimulate extracellular matrix synthesis and accumulation, and in vivo investigations to demonstrate the clinical impacts of such a construct on cartilage repair.
by Sanaz Saatchi.
S.M.
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Toonstra, Jenny L. "THE RELATIONSHIP BETWEEN PATIENT EXPECTATIONS, FUNCTIONAL OUTCOME, SELF-EFFICACY, AND REHABILITATION ADHERENCE FOLLOWING CARTILAGE REPAIR OF THE KNEE: A SEQUENTIAL EXPLANATORY ANALYSIS". UKnowledge, 2014. http://uknowledge.uky.edu/rehabsci_etds/20.
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Patient expectations have been shown to be a major predictor of outcomes. Furthermore, fulfilled expectations have been linked to increased patient satisfaction and rehabilitation adherence. Expectations may be influenced by a variety of factors, including patient characteristics, pre-operative function, or disease characteristics. However, it is currently unknown what factors and to what degree they may influence patient expectations prior to knee surgery. Furthermore, understanding the importance and values of those expectations for recovery using qualitative methods has not previously been conducted in this patient population.
A mixed methods design was used. Twenty-one participants scheduled to undergo cartilage repair of the knee, including autologous chondrocyte implantation, osteochondral allograft transplantation, or meniscal transplant were included. During their pre-operative visit, participants completed an expectations survey (Hospital for Special Surgery (HSS) Knee Surgery Expectations Survey) and the Knee Injury and Osteoarthritis Outcome Score (KOOS) as a measure of functional ability. At their first post-operative visit, patients completed the Self-Efficacy for Rehabilitation Scale (SER). Rehabilitation adherence was collected by the participant’s rehabilitation provider. A selected sample of 6 participants participated in a semi-structured interview 6 months following surgery to better understand their expectations for recovery. Pearson correlation coefficients were used to determine relationships between expectations and KOOS scores, SER scores, and measures of adherence.
Results demonstrated that patients have moderate expectations for recovery and these expectations were positively associated with pre-operative pain, activities of daily living, and knee-related quality of life as measured by the KOOS. In addition, a negative relationship was found between patient expectations and adherence with home exercises, use of a brace, and weight-bearing restrictions. Four qualitative themes emerged as participants’ described how previous recovery experiences shaped their recovery following cartilage repair of the knee. Patient education, pre-habilitation, and the use of psychological skills during rehabilitation may help to manage patient expectations, improve rehabilitation adherence, and assist clinicians in providing more focused and individualized patient care.
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Palmer, Gemma. "The role of self-compassion in mood repair for people with recurrent depression with and without experience of mindfulness-based cognitive therapy". Thesis, University of Exeter, 2018. http://hdl.handle.net/10871/34079.
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Systematic Review - Recent studies have identified potential change within interpersonal relationships following mindfulness-based interventions such as MBSR and MBCT; however, few studies have explored this in a clinical sample, from the participants’ perspective. This study aimed to explore this phenomenon by synthesising qualitative studies to answer the following question: How do people with a mental health diagnosis experience interpersonal change following MBSR and MBCT. A systematic search strategy identified 117 studies, of which 12 met the final inclusion criteria. A thematic synthesis was conducted based on the protocol developed by Thomas and Harden (2008). The thematic synthesis revealed an overall theme of connection, with subthemes of ‘the group as a community’; ‘reconnecting with the self’; ‘skill development’ and ‘reconnecting with others’. These themes were further synthesised to consider the interconnections between them. This revealed two points of interest: the power of the group community and intra- to inter-personal development. These themes were explored in relation to existing literature. The results are discussed in relation to the limitations of the study, and future research recommendations are considered. Empirical Paper - Mindfulness-based cognitive therapy (MBCT) have been shown to be effective in reducing the impact of cognitive reactivity (CR) and improving outcomes for people with recurrent depression. It has been proposed that this effect may be mediated by the cultivation of self-compassion; however, there is limited research into this mechanism. This study aimed to explore the lived experience of a sad mood induction and compassionate repair in people with currently remitted recurrent depression, with and without experience of MBCT. Sixteen participants were recruited (10 MBCT, six non-MBCT). Participants underwent a two-phase mood manipulation, sad mood induction and loving-kindness meditation (directed to a loved one and the self) and completed self-report measures before and after each task. Following this, participants engaged in a semi-structured interview exploring their experiences. The results showed both mood manipulations were successful, and mood repair was apparent within all but one of the participants. The interviews were analysed using thematic analysis, identifying six key themes: vulnerability versus tolerance of depression; immersion versus transience of cognitive and emotional reactivity; avoidance versus tolerance of compassion; self-criticism versus self-acceptance; locus of control and mechanisms of repair. No differences were observed between the two groups in their qualitative or quantitative responses to the mood manipulations; however, those in the MBCT group with a greater level of current MBCT practice, appeared more able to transcend negative thinking and utilise the Loving Kindness Meditation (LKM) more effectively for both themselves and others. The results are discussed in relation to study limitations and their implication to clinical practice.
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Sheehan, Benjamin T. "Customer service chatbots: Anthropomorphism, adoption and word of mouth". Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/121188/1/Benjamin_Sheehan_Thesis.pdf.
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Chatbots can be configured to provide customer service. This thesis submits two quantitative studies to support the idea that a chatbot's perceived humanness is important to consumers. Preliminary results suggest that the anthropomorphism of a chatbot leads to increases in adoption and recommendation intent. Furthermore, the source of the anthropomorphic perceptions appears linked to a chatbot's use of specific linguistic stratagems which can be manipulated by practitioners and researchers.
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Röde, Silja. "English as a lingua franca in political talk : The use of self-repair and repetition as clarification strategies in political interviews with Jean-Claude Juncker". Thesis, Stockholms universitet, Engelska institutionen, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-156937.
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This study investigates the use of two communicative strategies in particular, namely self- repair and repetition, in political interviews with Jean-Claude Juncker where English is used as a lingua franca (ELF). While ELF has received increasing attention throughout the past years, with a variety of researched genres ranging from higher education (e.g. Björkman 2011; Kaur 2011; Mauranen 2006) and business (Bjørge 2010; Firth 1996; Ehrenreich 2009; Pullin Stark 2009) to domestic settings (e.g. Klötzl 2014; Pietikäinen 2014), the genre of political interviews remains largely under-researched – despite it being such a highly international and high-stakes domain. Therefore, the aim of the present research is to include this domain to the list of researched genres, and thereby to gain a better understanding of how a politician uses ELF in his official role. The data comprises four interviews with the president of the EU-commission, Jean-Claude Juncker, with a total interview-time of 35 minutes. The interviews have been transcribed in their entirety for the purpose of the present study, and the data was analysed drawing on conversation analytic approaches. Both self-repair and repetition were frequently identified as clarification strategies in the data and their functions comply to a large extent with previous findings from ELF research (e.g. Kaur 2011; Lichtkoppler 2007; Mauranen 2006). Repetition was found to be used as a strategy to specify utterances and ensure understanding and self-repair to either right the wrongs or raise explicitness. In addition to that, the use of repetition showed some interview-genre related functions as well, such as the use of repetition to influence and interrupt the regular turn-taking structure of interviews. This study shows that the use of ELF is in fact to a certain extent different in political interviews than in other researched genres, and therefore suggests that further studies within this genre would significantly contribute to the field of research into ELF.
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Mohammadi, Mohammad Reza [Verfasser]. "Stability and self-repair of amorphous cobalt/nickel oxyhydroxides for electrocatalytic water oxidation investigated by electrochemical protocols combined with X-ray absorption spectroscopy / Mohammad Reza Mohammadi". Berlin : Freie Universität Berlin, 2019. http://d-nb.info/1188239988/34.
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Goyal, Abhilash. "Methodologies for low-cost testing and self-healing of rf systems". Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/44705.
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This thesis proposes a multifaceted production test and post-manufacture yield enhancement framework for RF systems. This framework uses low-cost test and post-manufacture calibration/tuning techniques. Since the test cost and the yield of the RF circuits/sub-system directly contribute to the manufacturing cost of RF systems, the proposed framework minimizes overall RF systems' manufacturing cost by taking two approaches. In the first approach, low-cost testing methodologies are proposed for RF amplifiers and integrated RF substrates with an embedded RF passive filter and interconnect. Techniques are developed to test RF circuits by the analysis of low-frequency signal of the order of few MHz and without using any external RF test-stimulus. Oscillation principles are used to enable testing of RF circuits without any external test-stimulus. In the second approach, to increase the yield of the RF circuits for parametric defects, RF circuits are tuned to compensate for a performance loss during production test using on-board or on-chip resources. This approach includes a diagnosis algorithm to identify faulty circuits within the system, and performs a compensation process that adjusts tunable components to enhance the performance of the RF circuits. In the proposed yield improvement methodologies, the external test stimulus is not required because the stimulus is generated by the RF circuit itself with the help of additional circuitry and faulty circuits are detected using low-cost test methods developed in this research. As a result, the proposed research enables low-cost testing and self-healing of RF systems.
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Boutobza, Slimane. "Outils de génération de structures BIST/BISR pour mémoires". Grenoble INPG, 2002. http://www.theses.fr/2002INPG0166.
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Les Systems on Chip (SoC) actuels intègrent en général une grande proportion de mémoires enterrées. Ces mémoires sont de plus en plus denses et occupent des surfaces très importantes dans le circuit (jusqu'à 80%). Ces mémoires peuvent présenter un grand taux de défauts affectant ainsi d'une façon conséquente le rendement total du circuit. La qualité de la mémoire et donc cruciale pour la qualité de l'ensemble du circuit. D'autre part, la réduction du coût du développement passe par la réduction du coût du test. Enfin, le management de la complexité de test des structures de plus en plus complexes (e. G. , il existe actuellement des SoC contenant plus de 400 mémoires enterrées !), ne peut se faire d'une manière efficace sans la disposition et l'intégration des techniques de test les plus avancées. La clé du succès d'une bonne stratégie de test passe par les exigences d'une qualité élevée du test et de son automatisation. À travers la première partie des travaux réalisés dans cette thèse, nous avons tenté de répondre à l'exigence de la qualité de test en présentant un ensemble assez diversifié de solutions de test intégré (BIST) pour mémoires. Ces solutions couvrent les différents types de test d'une mémoire: test de caractérisation et de débuggage des processus de fabrication instables, test de production, test durant la phase opérationnelle et test d'analyse des défauts. Ces solutions permettent de palier aux limitations des techniques BIST existantes, telles que le meilleur compromis couverture de fautes/coût en surface et la garantie d'un test à la fréquence nominale. Ce dernier point a été pris en compte en proposant une technique d'optimisation temporelle (appelée Rapid BIST) des architectures BISTs élaborées, qui permet une réduction du temps de test et une meilleure couverture de faute en assurant un test à la fréquence nominale même pour les mémoires très rapides (afin de couvrir les fautes de délai). Ces différents avantages sont offerts sans pour autant négliger le coût additionnel en surface. Nous avons également développé une technique CBISR (Column BISR) qui permet d'assurer un rendement de production élevé et une durée de vie prolongée en particulier pour les mémoires de grandes tailles. La seconde partie de cette thèse adressait le problème de la génération automatique des solutions élaborées en concevant et implémentant un outil de synthèse de structures BIST/BISR pour mémoires. Cet outil innove à la fois par l'approche de son implémentation et par les fonctionnalités offertes. Afin de permettre une implémentation efficace, il utilise une approche originale de synthèse de BIST pour les tests de mémoires. Cette approche est basée sur la notion de perturbation par rapport à un axe médian représenté par les tests Marchs. Hormis quelques tests électriques, cette approche de synthèse permet de synthétiser (sur le tas) n'importe quel algorithme de test pour mémoires en une architecture BIST compacte. D'autre part, cette approche est suffisamment flexible pour pouvoir supporter la synthèse des algorithmes de test qui pourront être développés. Il suffit pour cela de supporter leurs perturbations. Les blocs matériels bas niveau sont conçus en utilisant un langage de description spéciale (CHDL) qui est lui-même modélisé sous forme de structure de données écrites dans un langage haut niveau (C++). L'outil implémente un ensemble assez large de solutions BIST/BISR notamment ceux développés dans le cadre de cette thèse. Il offre une indépendance vis à vis de : - La technologie à utiliser, en offrant des descriptions RTL synthétisables. - L'environnement de conception, en générant des scripts de synthèse pour une variété d'outils de synthèse (AMBIT, Design Compiler), et des scripts de simulation pour les simulateurs les plus connus. - Du langage de description de matériel supporté par l'environnement de conception, en décrivant les architectures implémentées dans un langage interne de haut niveau (CHDL) qui pourront ensuite être translatées en langage VHDL et/ou VERILOG. Il offre enfin un mécanisme pour explorer l'espace des solutions en prenant en compte différentes stratégies d'optimisation afin de délivrer l'architecture optimale, suivant le coût en surface, et/ou la fréquence de fonctionnement, et/ou la couverture de faute et/ou la capacité de réparationModern Systems on Chip usually include large embedded memories. These memories occupy the largest part of the circuit (up to 80% of the total circuit area). Furthermore, memories are more dense than logic and thus, more prone to faults. Therefore, the quality of the memory is crucial for the overall quality of the chip. On the other hand, the reduction of the development cost passes from the reduction of the test cost. Finally, the management of the test complexity of the increasingly complex structures cannot be made with an effective manner without the provision and integration of the advanced test techniques. In the first part of the present thesis, we try to answer to test quality requirement by presenting various memory Built In Self-Test (BIST) solutions that cover all the tests required for memory: characterization test, production test, field test and defects analysis test. The proposed solutions allow handling the limitations of the existing memory BIST techniques, such as the selection of the best trade-off between fault coverage/area overhead and the guarantee of the at-speed testing. We developed also a CBISR (Column Built In Self Repair) technique that allows a significant yield improvement and a prolonged product life in particular for large memories. The second part of this thesis addresses the problem of the automation of the BIST/BISR solutions generation. This is done by designing and implementing a synthesis tool for memories BIST/BISR. This tool innovates at the same time by its implementation approach and the offered features. In order to allow an effective implementation, it uses an original approach of BIST synthesis of the memory tests. This approach is based on the concept of disturbance by report to a median axis represented by the March tests. Except some electric tests, this synthesis approach allows to synthesize any memory test algorithm. Furthermore, by supporting the disturbances of these algorithms, this approach is flexible enough to allow supporting the synthesis of new test algorithms that could be introduced in the future. It offers finally, a mechanism to explore the solutions space by taking into account various optimization strategies in order to deliver optimal architecture, with respect to area cost, the operation frequency, the fault coverage and the repair efficiency
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Sandberg, Fransson Emelie, i Petra Olgarsson. "Bubblan som sprack - Isabella Löwengrips kriskommunikation genom bloggen". Thesis, Umeå universitet, Institutionen för kultur- och medievetenskaper, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-169607.
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The research conducted in The Bubble That Burst – Isabella Löwengrip’s Crisis Communication Through Blog Posts aims to answer how Isabella Löwengrip attempted to save both her and her companies images during a crisis in the fall of 2019. Benoit’s Image Repair Theory and Goffman’s Self-Presentation Theory were combined to create the framework of this study. The material studied were blog posts uploaded onto her personal blog that mainly concerned the crisis during the months of October and November 2019. To demonstrate how the crisis evolved, additional material was added from February 2020. A textual rhetorical analysis method was used to investigate how Löwengrip aimed to persuade the blog’s readers that both she and her companies are still trustworthy. The results showed that Löwengrip used several Image Repair as well as rhetorical strategies. Löwengrip also changed her self-presentation during the crisis. Furthermore, it demonstrates how aware she is about her image. Additionally, the personal character of the blog medium makes the crisis communication more emotionally based and relationship building than traditional Image Repair and crisis communication efforts.
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Mendes, Henry Silvério. "Análise de ligação entre o substrato de concreto antigo e concreto auto adensável com lançamento subaquático". Universidade Federal de Uberlândia, 2009. https://repositorio.ufu.br/handle/123456789/14135.
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The objective of this paper is to present the results of the connection between a substrate
and self-compacting concrete with underwater launch simulating the repairs to concrete
structures submerged in various applications. Therefore, we used samples of "old" concrete
structures extracted from the Power Plant Itumbiara the state of Goiás, which was
considered substrates. The concrete used in this work follows the parameters established
strengths in the research completed in 2003 by the laboratory of Furnas Centrais Elétricas
and has been adjusted to the materials (gravel and sand) found in the city of the Minas
Gerais.
The results are from the sample concrete of vertical and horizontal joints of the bodyspecimens
prismatic concrete substrates and kept submerged and extracted after a year, so
almost complete hydration.
The analysis relating to the launch of concrete indicate that it is entirely feasible production
for small applications. Visibility during the concreting was hampered by increased
turbidity of the water produced by the concrete, so you must reduce the presence of a direct
flow of water in concrete. The analysis was by comparing the results of the testimonies and
bodies-of-proof. We observed an increase in strength in direct relation to the diameter of
the testimony. In the samples concrete of 50 mm x 100 mm was obtained a coefficient of
variation of 9.00% giving the concrete a low variability. The testimonies of concrete
compounds and submerged concrete substrate (with seal inclined) had a resistance value
84% over the bodies-of-proof. The tensile strength by diametrical compression of the
testimony amounted to 54% of the reference value. Can also check the interface between
substrate concrete and after the break.O objetivo deste trabalho é apresentar os resultados do estudo da ligação entre um substrato e o concreto auto-adensável com lançamento subaquático simulando a realização de reparos em estruturas de concreto submersas em diversas aplicações. Para tanto foram utilizadas amostras de concreto antigo provenientes de estruturas extraídas da Usina Hidrelétrica de Itumbiara no estado de Goiás, que foram considerados substratos, o concreto utilizado no presente trabalho segue os parâmetros de dosagens estabelecidos na pesquisa concluída em 2003 pelo laboratório de Furnas Centrais Elétricas e foi ajustado aos materiais (brita e areia) encontrados na região de Uberlândia do Estado de Minas Gerais. Os resultados obtidos são provenientes de testemunhos das juntas verticais e horizontais dos corpos-de-prova prismáticos concretados com substratos e mantidos submersos e extraídos após um ano, portanto, a hidratação quase completa. As análises relativas ao processo de lançamento do concreto indicam que é totalmente viável sua produção para pequenas aplicações. A visibilidade durante a concretagem foi dificultada pelo aumento de turbidez da água produzida pelo concreto, portanto deve-se diminuir a presença de um fluxo de água direto no concreto. As análises foram por comparação entre os resultados dos testemunhos e dos corpos-de-prova. Foi observado um aumento da resistência em relação direta ao diâmetro do testemunho. Nos testemunhos de 50 mm x 100 mm obteve-se um coeficiente de variação de 9% dando ao concreto uma variabilidade baixa. Os testemunhos compostos de concreto submerso e substrato de concreto (com junta inclinada) obtiveram uma resistência com valor 84% em relação os corpos-de-prova. A resistência à tração por compressão diametral dos testemunhos correspondeu a 54% do valor de referência. Também pode ser verificada a interface entre substrato e concreto após a ruptura.
Mestre em Engenharia Civil
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Chagnon, Lucie. "Formulation et caractérisation de revêtements polyuréthane hydrodiluables présentant des propriétés d'autoréparation". Thesis, Mulhouse, 2012. http://www.theses.fr/2012MULH8495.
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L’objectif de la thèse concerne la compréhension des mécanismes physico-chimiques qui gouvernent la résistance à l’abrasion/rayure, la protection de surface et la porosité de formulations polymères aqueuses déposées en films minces pour des applications « peintures industrielles ». Dans une première étape, l’ensemble des propriétés physiques et chimiques de deux formulations polymères aqueuses contenant des résines industrielles acryliques polyhydroxylées ont été déterminées. La deuxième étape a été, quant à elle, axée sur l’étude de l’impact des variations de la structure tridimensionnelle du réseau sur les propriétés de résistance à la rayure et d’autoréparation des films, en particulier par activation thermiqueThis thesis deals with the understanding of physical chemistry mecanisms who give to a material its abrasion / scratch resistance properties, surface protection and porosity of aqueous polymer formulations deposited in thin films for ‘industrial painting" applications. In a first step, all the physical and chemical properties of two aqueous polymer formulations containing polyhydroxy acrylic industrial resins were determined. The second step was, meanwhile, focused on the study of the impact of changes in the three-dimensional network structure on the properties of resistance to scratching and self-repairing films, particularly by thermal activation
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Tomczyk, Daniel A. Sewell Kenneth W. "An exercise in story repair a guided written disclosure protocol for fostering narrative completeness of traumatic memories /". [Denton, Tex.] : University of North Texas, 2008. http://digital.library.unt.edu/permalink/meta-dc-6043.
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Imran, Naveed. "Autonomous Recovery of Reconfigurable Logic Devices using Priority Escalation of Slack". Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5949.
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Field Programmable Gate Array (FPGA) devices offer a suitable platform for survivable hardware architectures in mission-critical systems. In this dissertation, active dynamic redundancy-based fault-handling techniques are proposed which exploit the dynamic partial reconfiguration capability of SRAM-based FPGAs. Self-adaptation is realized by employing reconfiguration in detection, diagnosis, and recovery phases.
To extend these concepts to semiconductor aging and process variation in the deep submicron era, resilient adaptable processing systems are sought to maintain quality and throughput requirements despite the vulnerabilities of the underlying computational devices. A new approach to autonomous fault-handling which addresses these goals is developed using only a uniplex hardware arrangement. It operates by observing a health metric to achieve Fault Demotion using Reconfigurable Slack (FaDReS). Here an autonomous fault isolation scheme is employed which neither requires test vectors nor suspends the computational throughput, but instead observes the value of a health metric based on runtime input. The deterministic flow of the fault isolation scheme guarantees success in a bounded number of reconfigurations of the FPGA fabric.
FaDReS is then extended to the Priority Using Resource Escalation (PURE) online redundancy scheme which considers fault-isolation latency and throughput trade-offs under a dynamic spare arrangement. While deep-submicron designs introduce new challenges, use of adaptive techniques are seen to provide several promising avenues for improving resilience. The scheme developed is demonstrated by hardware design of various signal processing circuits and their implementation on a Xilinx Virtex-4 FPGA device. These include a Discrete Cosine Transform (DCT) core, Motion Estimation (ME) engine, Finite Impulse Response (FIR) Filter, Support Vector Machine (SVM), and Advanced Encryption Standard (AES) blocks in addition to MCNC benchmark circuits. A significant reduction in power consumption is achieved ranging from 83% for low motion-activity scenes to 12.5% for high motion activity video scenes in a novel ME engine configuration. For a typical benchmark video sequence, PURE is shown to maintain a PSNR baseline near 32dB. The diagnosability, reconfiguration latency, and resource overhead of each approach is analyzed. Compared to previous alternatives, PURE maintains a PSNR within a difference of 4.02dB to 6.67dB from the fault-free baseline by escalating healthy resources to higher-priority signal processing functions. The results indicate the benefits of priority-aware resiliency over conventional redundancy approaches in terms of fault-recovery, power consumption, and resource-area requirements. Together, these provide a broad range of strategies to achieve autonomous recovery of reconfigurable logic devices under a variety of constraints, operating conditions, and optimization criteria.Ph.D.
Doctorate
Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering
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Tomczyk, Daniel A. "An exercise in story repair: A guided written disclosure protocol for fostering narrative completeness of traumatic memories". Thesis, University of North Texas, 2008. https://digital.library.unt.edu/ark:/67531/metadc6043/.
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The present study sought to build on the large body of past research into written disclosure of traumatic memories. This research has consistently found that participants who write about their traumatic experiences realize long-term physiological and psychological health benefits. More recently, it has been found that those participants who realize the most benefits are those who progressively include more elements of a good narrative, or story, in their writing about a traumatic experience over several sessions. Therefore, research has begun to examine the role of language and the structure of language in the health benefits gained from written disclosure of traumatic memories. A guided written disclosure protocol was designed for the present study, which sought to aid participants in supplying an increasing amount of narrative structure to their written disclosures of a single traumatic experience. Participants (N = 30) completed several measures of psychological and physiological health prior to and one month after completing the guided written disclosure protocol. Analyses revealed that participants who completed all four writing sessions showed statistically significant reductions in symptoms of general psychological distress, obsessive-compulsive symptoms, and intrusive and avoidant symptoms related to the traumatic experience. No significant self-reported physiological health benefits were found. The clinical and research implications of these findings are discussed.
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Булгакова, Юлія Вадимівна, Юлия Вадимовна Булгакова, Yuliya V. Bulhakova i Yu V. Bulgakova. "Розвиток системи управління діяльністю вантажних вагонних депо в умовах сучасного ринку". Thesis, Видавництво Дніпропетровського національного університету залізничного транспорту імені академіка В. Лазаряна, 2013. http://eadnurt.diit.edu.ua:82/jspui/handle/123456789/1738.
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Булгакова, Ю. В. Розвиток системи управління діяльністю вантажних вагонних депо в умовах сучасного ринку : авт. дис. к. е. н.: 08.00.04 / Ю. В. Булгакова ; Дніпропетр. нац. ун-т залізн. трансп. ім. акад. В. Лазаряна. - Д. : Вид-во Днiпропетр. нац. ун-ту залізн. трансп. iм. акад. В. Лазаряна, 2013. - 21 с. : рис.
ГРНТИ 73.29.51 УДК 338.47:629.47(043.3) Захист - 1 листопада 2013 р.UK: АНОТАЦІЯ Дисертаційна робота присвячена питанню формування та розвитку системи управління діяльністю вантажних вагонних депо за рахунок: удосконалення концептуального підходу до формування системи управління діяльністю вантажних вагонних депо в умовах сучасного ринку; удосконалення системи управління діяльністю вагонних депо з організацією окремого акціонерного товариства; удосконалення організаційної структури управління вагонними депо; розвитку інструментів визначення укрупненого бюджету вантажних вагонних депо; розвитку методичного підходу щодо визначення вартості реконструкції та технічного переоснащення існуючих вантажних вагонних депо України. У дисертаційній роботі удосконалено науково-методичний підхід щодо оптимізації потужності вагонних депо в умовах зниження попиту на ремонт вантажних вагонів за рахунок визначення раціональної кількості вагонних депо, спеціалізації їх на ремонті одного або двох типів рухомого складу, впровадження в них потокового методу ремонту, забезпечення функціонування вагонних депо на рівні виробничої потужності, що дозволить знизити собівартість ремонту вагонів та підвищити ефективність вантажних перевезень.
RU: АННОТАЦИЯ Для обеспечения потребностей предприятий и организаций в перевозке грузов с максимальным качеством и скоростью необходимы современный подвижной состав, успешный менеджмент, разумная тарифная политика и эффективные вагонные депо. В условиях современного рынка возникла необходимость в развитии системы управления деятельностью грузовых вагонных депо и усовершенствовании научно-методического подхода к оптимизации их мощности в условиях снижения спроса на ремонт грузовых вагонов. В результате исследования научных трудов ведущих ученых и специалистов, которые занимались вопросами управления деятельностью предприятий железнодорожного транспорта, установлено недостаточную теоретическую, методическую и практическую оценку данной проблемы, которая в условиях современного рынка выходит на первый план, поскольку от качества и уровня себестоимости деповского ремонта зависит рабочее состояние грузового парка вагонов. Диссертационная работа посвящена вопросу системы управления деятельностью вагонных депо. Поставленная цель исследования была достигнута благодаря: - усовершенствованию концептуального подхода к формированию системы управления деятельностью грузовых вагонных депо в условиях современного рынка; - усовершенствованию научно-методического подхода к оптимизации мощности вагонных депо в условиях современного рынка; – усовершенствованию системы управления деятельностью вагонных депо с формированием отдельного акционерного общества; – усовершенствованию организационной структуры управления вагонны-ми депо; – развитию инструментов определения укрупненного бюджета грузовых вагонных депо; – развитию методического подхода к определению укрупненной стоимости реконструкции и технического переоснащения вагонных депо. В диссертационной работе усовершенствован концептуальный подход к формированию системы управления деятельностью грузовых вагонных депо в условиях современного рынка, сущность которого в отличие от существующего состоит в разделении функций ремонтной и эксплуатационной деятельности вагонных депо за счет выделения эксплуатационных депо, перепрофилирования деятельности, передачи в аренду или ликвидации неэффективных ремонтных депо, разделения других ремонтных депо между публичным акционерным обществом «Украинськи зализныци» и акционерным обществом по деповскому ремонту грузовых вагонов, что позволит снизить расходы на их эксплуатацию с помощью разработки новой организационной структуры. Усовершенствован научно-методический подход к оптимизации мощности вагонных депо в условиях снижения спроса на ремонт грузовых вагонов за счет определения рационального количества вагонных депо, специализации их на ремонт одного или двух типов подвижного состава, внедрения в них поточного метода ремонта, обеспечения функционирования вагонных депо на уровне производственной мощности, что позволит снизить себестоимость ремонта вагонов и повысить эффективность грузовых перевозок. Усовершенствована система управления деятельностью вагонных депо, которая отличается от существующей формированием отдельного акционерного общества по деповскому ремонту грузовых вагонов и адаптацией его деятельности к условиям современного рынка за счет развития элементов системы управления: объекта и субъекта управления, поставки ресурсов, технологии ремонтного производства, сбыта ремонтных услуг, мониторинга результатов деятельности вагонных депо, что позволит повысить эффективность их деятельности. Усовершенствована организационная структура управления вагонными депо, которая в отличие от существующей предусматривает децентрализацию управления их деятельностью за счет формирования новой бюрократической структуры дивизионного типа, в которой создан центральный офис и обособленные структурные подразделения (вагонные депо), в которых предложены центры доходов, расходов и прибыли, что позволит повысить эффективность их функционирования с помощью использования организационно-распорядительного метода. Получили последующее развитие инструменты определения укрупненного бюджета вагонных депо за счет установления зависимостей между отдельными элементами эксплуатационных расходов и основными параметрами помещений вагонных депо, которые позволяют с существенным снижением трудоемкости расчетов и достаточной точностью прогнозировать годовые эксплуатационные расходы. Получил последующее развитие методический подход к определению укрупненной стоимости реконструкции и технического перевооружения вагонных депо, который позволит снизить трудоемкость прямых расчетов с помощью индексного метода.
EN: ANNOTATION The thesis is dedicated to the problem of forming and development of car depots activity management by means of: improving of conceptual approach to the formation of the control system of the freight car depots activity in the conditions of current market; improving the system of management of car depots activity with the organization of the separate joint-stock company; organizational structure improvement of car depots management; development of consolidated budget determination instruments of freight car depots; development of methodical approach to the cost determination of reconstruction and technical reequipment of existing freight car depots in Ukraine. The thesis improves the scientific and methodical approach to optimization of car repair enterprise capacity in the conditions of the demand decrease for freight car repair by means of determination of the car depots rational number, their specialization in the repair of one or two types of rolling stock, the introduction of the flow repair method, support of depots operation at the capacity level, which will significantly reduce the cost of car repairing and increase the efficiency of freight transportations.