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Bylander, Thomas C. "Consolidation : a method for reasoning about the behavior of devices /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487266691095527.
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Casey, Brendan (Brendan Anthony). "The consolidation and strength behavior of mechanically compressed fine-grained sediments." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/90039.
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Thesis: Ph. D. in Geotechnical and Geoenvironmental Engineering, Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, 2014.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 251-259).
This thesis investigates the consolidation and shear strength behavior of saturated fine-grained sediments over the effective stress range of 0.1 to 100 MPa. The research makes use of samples which are resedimented in the laboratory from natural soils. In addition to practical benefits, resedimentation allows for isolation and quantification of individual factors influencing behavior such as composition, consolidation stress and overconsolidation ratio (OCR). Ko-consolidated triaxial compression tests were performed on eight resedimented soils at room temperature. The results demonstrate conclusively that the conventional assumption of these soils exhibiting constant normalized properties is not valid when behavior is evaluated over a significant stress range. The direction and rate at which a soil's strength properties vary depend on its composition, with high plasticity soils showing a much more rapid reduction in both normalized undrained strength and critical state friction angle with increasing stress compared to low plasticity soils. For all soils, increasing consolidation stress results in a more ductile stress-strain response during undrained shearing as strain to failure increases and the amount of post-peak strain softening reduces at each OCR. Variations in strength properties as a function of stress level and soil type are closely linked to Ko, with higher values of Ko associated with both lower friction angles and lower undrained strengths. During virgin compression, high plasticity soils display a rapid increase in Ko and values in excess of 0.80 have been measured at high stresses. The permeability behavior of a large number of resedimented soils has been investigated over a permeability range of 10-¹⁴ m² to 10-²⁰ m² and a porosity range of about 0.75 to 0.20. The permeability-porosity relationship for a soil can be correlated to its liquid limit, which provides a robust indicator of the combined effects of pore size distribution and clay minealogy on behavior. Virgin compression behavior is strongly influenced by composition at low stresses, although at high stresses all fine-grained soils display a similar compression behavior regardless of their composition. The conventional 'Terzaghi' definition of effective stress is shown to be applicable to fine-grained sediments at pore pressures up to at least 10 MPa.
by Brendan Casey.
Ph. D. in Geotechnical and Geoenvironmental Engineering
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Hansen, Steven Matthew. "Influence of Consolidation and Interweaving on Compression Behavior of IsoTruss™ Structures." BYU ScholarsArchive, 2004. https://scholarsarchive.byu.edu/etd/15.
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Composite IsoTruss™ structures incorporate intersecting longitudinal and helical members. At the intersections, the fiber tows can be interwoven to achieve mechanical interlocking for increased joint integrity. Interlocking introduces gaps and curvilinear fiber paths similar to the crossovers in filament-wound structures, potentially facilitating local delamination within the members, thus reducing the strength and/or damage tolerance of the structure. Optimizing the interlocking pattern at the joints along with efficient consolidation minimizes these effects.
Joint specimens were fabricated using a specially designed machine. Specific tow intersection patterns at the joint were: 1) Completely encapsulating the longitudinal member with the tows of the helical member; and 2) Interweaving the tows of the helical member with the tows of the longitudinal member. Consolidation was accomplished using: 1) a braided sleeve; 2) a coiled sleeve; 3) a sparse spiral Kevlar® wrap; 4) a polyester shrink tape sleeve; 5) twisting the entire bundle of longitudinal fiber tows; and 6) cinching the joints using aramid fiber.
Ultimate compression strength and stiffness is directly related to the straightness of the tows in the longitudinal members at the intersections. An encapsulated joint reduces member strength by only 4.6%; whereas, an interwoven joint reduces member strength by 30.5%. The fiber paths of the longitudinal member in encapsulated joints are straighter than in interwoven joints, resulting in an average strength difference of 26.2%.
Physical properties, strength, and stiffness show that consolidation quality directly affects performance. Consolidation using sleeves provides high quality consolidation, high strength, and high stiffness. Encapsulated joints consolidated using sleeves have an average ultimate strength and Young's modulus 34% and 21% higher, respectively, than encapsulated joints consolidated using other methods. Interwoven joints consolidated using sleeves have an average ultimate strength and Young's modulus 28% and 19% higher, respectively, than interwoven joints consolidated using other methods. Consolidating specimens using a braided sleeve yields the highest quality based on consistency, strength, and stiffness. Consolidating specimens by twisting the longitudinal member yields the lowest strength and stiffness. These conclusions will be applied to IsoTrussâ„¢ grid structure design and manufacturing technology.
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Nam, Sookie. "Settling and sedimentation behavior of fine-grained materials." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/42677.
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Channeling has already been an observed phenomenon that often occurs during settling and sedimentation processes of finer materials. However, it has been regarded as a minor factor affecting settling process, e.g. settling velocity or consolidation rate. In this study, settling behaviors of talcs, kaolins and attapulgite were reviewed by experiments with small and large settling columns with special focus on channel formation during sedimentation. The large settling column is equipped with twenty eight measuring points, which are connected to pressure transducers for measuring pore pressure changes during settling. Throughout the study, channel formation was observed and related to the experimental conditions affecting it. The excess pore pressure changes were measured during the large column tests. Channels occurred under flocculation in zone settling and also in consolidation zones; pressure drop was observed near channels in some cases. It was apparent that channels work as a facilitator to dissipate the excess pore water pressure. It is summarized that not only initial concentration but also the material properties, such as specific gravity and shape of particles, can affect the channel formation.Master of Science
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Budnik, Aimee Helen. ""IDENTIFYING PREDICTORS FOR PRIMARY PREVENTION ACTIVITIES IN LOCAL HEALTH DEPARTMENTS: UNDERSTANDING THE ROLE OF CONSOLIDATION"." Kent State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=kent1543629941331548.
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Xu, Dapeng. "Time effects on soil behavior : a particulate-scale study on the mechanisms of secondary consolidation and ageing /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202006%20XU.
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Karim, Md Rezaul. "Simulation of long-term consolidation behavior of soft sensitive clay using an elasto-viscoplastic constitutive model." 京都大学 (Kyoto University), 2006. http://hdl.handle.net/2433/136140.
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Lent, David D. "Learning and Memory and Supporting Neural Architecture in the Cockroach, Periplaneta americana." Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/193804.
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The cockroach, with its large brain and physiological resilience, holds many advantages for the development of behavioral paradigms. The work presented here provides a foundation for, and describes the results of, the implementation of studies of neural correlates of learning and memory on restrained animals.Using the antennal projection response (APR) as an indicator of learning and retention, several learning paradigms have been developed. A visual-olfactory associative and a gustatory-olfactory aversive conditioning paradigm demonstrated a plastic behavior that could be driven in an intact and immobilized cockroach. Conditioning the APR to a visual cue paired with an olfactory cue characterized the role of unilateral and bilateral olfactory input in learning and memory. While unilateral olfactory input is sufficient to learn a visual-olfactory association, bilateral olfactory input is necessary for long-term retention of the association. This comparison identified a critical time period in which memory is consolidated. This time period was subsequently used to analyze gene expression during memory consolidation.The split-brain cockroach preparation was developed to investigate what parts of the brain are necessary and sufficient for learning and retention of a visual-olfactory association; this preparation was also used to examine learning-induced changes in test tissue versus control tissue provided by the same animal. Evidence suggests that half of a brain is sufficient for a visual-olfactory association to be established and sufficient for retention of that association between 12 and 24 hours. However, the entire brain is necessary for long-term memory to be established. Using the split-brain cockroach simultaneously as the control and the test subject, learning-induced alterations in the microglomerular synaptic complexes of the calyces were identified in the trained half, but not in the naïve half.Using the APR, spatial learning and memory was examined. Multiple representations of space were revealed in the brain of the cockroach. Cockroaches represent space in terms of an olfactory gradient map, as well as the visuospatial relationship between objects. When both representations of space can be utilized by the cockroach to localize a cue, the positional visual cue is the one that determines the behavioral response.
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Denham, Martha H. "The Use of Laboratory Testing to Understand the Behavior of Collapsible Soil Upon Wetting." PDXScholar, 1992. https://pdxscholar.library.pdx.edu/open_access_etds/4664.
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In developing a constitutive model that could predict the settlement due to the collapse, several goals needed to be met. These were to gain an understanding of the collapse phenomenon, knowing the soil properties at the natural water content and how they change after collapse, and develop and test the new model. It was felt that laboratory testing could be of use. The types of test conducted included use of the Oedometer, Pressuremeter, and Triaxial tests. The material that was used for the testing was a "generic" soil manufactured out of diatomite. In all of the tests the soil was tested dry and saturated in order to establish state limits of the soil. Next, the soil was loaded dry then inundated which initiated the collapse of the soil. The stress and strains were continually recorded. From the testing it was concluded that there is a stress-strain region where after collapse the soil looses considerable strength. With increasing stress and strain the soil eventually becomes stronger. From the triaxial tests, the stress-strain data from this "region of collapse" was used in a constitutive model. Stress paths from the Oedometer and Pressuremeter tests were then successfully applied to the model. The constitutive model used was an elasto plastic model. The elastic and plastic strain components were provided using functions for yielding, hardening, plastic potential, and failure as proposed by Paul Lade in his work on cohesionless, frictional materials. Results from the conventional triaxial shear tests and isotropic compression tests were used to derive the values of the functions for the model. The end result was three dimensional surfaces for failure, yielding, plastic work and plastic potential for the dry and saturated soil in the zone of collapse.
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Chen, Tao. "The mechanical properties and oxidation behavior of nanocrystalline NiAl synthesized via shock consolidation of mechanically alloyed powders of Ni and Al." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/20029.
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Ellmore, Timothy Michael. "The Speed of Associative Learning and Retrieval in Humans and Non-Human Primates." Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/195717.
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The conversion of a memory from an initially fragile state to an enduring representation requires cellular, molecular, and systems-level brain network changes. This reorganization is hypothesized to involve time-dependent neuroanatomical changes that may differentially support some types of remote versus recent memory, and may also influence the latency to decide and complete responses during retrieval. To quantify the timecourse of learning and retrieval after different retention durations, a paradigm is developed to measure in humans and monkeys the retrieval speed of visuomotor associations, which require an intact hippocampus for initial acquisition but not for retrieval after days or weeks. Two components of retrieval speed, a decision time to initiate movement and a velocity-dependent movement completion time to complete a motor response, are shown to change differently relative to a pre-retention baseline. Movement completion times decrease across repetitions within single learning session, and continue to decrease from the level reached at the end of learning following retention. Decision times also decrease within the learning session, but increase on the first post-retention retrieval attempt as a function of retention interval duration. Extensive practice is required for decision times to reach a level below that obtained at the end of learning, and the transition from a long- to short-latency decision depends on the number and spacing of practice trials. The findings are discussed in a framework in which post-retention processing time is influenced by the speed of visual identification, the time to retrieve the associative relationship from long-term memory, and the time to plan and execute a motor response. The creation of sparser, long-lasting visual form representations and strengthened cortico-striatal connections predict behavioral efficiency gains in visual identification and motor responses after learning. Decision times could be fast and automatic following extensive practice when the neural representation may become stored permanently in cortico-cortical and cortico-striatal linkages, or could increase after retention because of several cognitive and neural factors, including interference and frontal inhibition of the hippocampal system to prevent new learning before choice feedback. The experimental results are discussed in the context of the existing literature on memory consolidation.
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Yun, SeongKyu. "Development of the numerical procedure to describe multi-dimensional behavior of the alternating Pleistocene foundations." Kyoto University, 2020. http://hdl.handle.net/2433/245842.
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Ferreira, de Medeiros Gabriela. "Impact of CBG deficiency on emotional and cognitive processes." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0072/document.
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La grande diversité des réponses de stress observée entre individus a pour origine des facteurs génétiques en interaction avec des facteurs environnementaux. Certaines réponses peuvent être moins adaptées et accroitre la vulnérabilité de l’individu aux divers troubles et pathologies liées au stress. La CBG est une glycoprotéine plasmatique impliquée dans la biodisponibilité des glucocorticoïdes, un des principaux médiateurs de la réponse au stress. Des études génétiques ont montré que des polymorphismes du gène codant la CBG ont un impact significatif sur la réponse des glucocorticoïdes au stress. Pour comprendre les mécanismes de l’impact de la CBG sur l’action des glucocorticoïdes et les conséquences sur les réponses endocriniennes et comportementales de stress, notre équipe a développé un modèle de souris déficiente pour le gène Cbg. Ces souris présentent une réponse diminuée des glucocorticoïdes au stress, associée à un niveau élevé de comportement émotionnel de type dépressif. Cette thèse a pour but d’explorer plus en profondeur les altérations physiologiques et comportementales des souris Cbg ko. Nous avons montré que le niveau plus faible de glucocorticoïdes observé chez la souris Cbg ko provient d’une élimination plasmatique plus importante. Une étude chez la souris Cbg ko femelles a montré que les estrogènes se surimposent à la déficience en CBG pour induire des comportements de type dépressif. Nous avons également démontré que la déficience en CBG conduit a une atténuation de la sensibilité comportementale et endocrinienne au stress chronique. Enfin, nous avons observé une détérioration de la mémoire long terme de ces souris. Par ailleurs, nous montrons que dans des conditions de stress chronique associé à un régime alimentaire déséquilibré le métabolisme du glucose était altéré chez les animaux déficients en CBG. Ces résultats renforcent l’importance du rôle de la CBG influençant l’ensemble des mécanismes d’actions des glucocorticoïdes par la modulation de leurs niveaux et de leur disponibilitéThe great diversity in the response to stress observed among individuals originates from their genetic background in interaction with environmental factors. Some responses can be less adaptive and increase the vulnerability to develop stress-associated disorders. CBG is a plasma glycoprotein that regulates the bioavailability of glucocorticoids, one of the main mediators of the stress response. Genetic studies pointed out variations in the gene coding for CBG as a major factor influencing the glucocorticoid response to stress. To better understand the mechanisms involved and the consequences on endocrine and behavioral responses to stress, our team has developed a mouse model of CBG deficiency. These mice present blunted glucocorticoid response to stress associated with increased despair-like behaviors. This thesis aimed at further exploring the physiological and behavioral alterations presented by the Cbg ko mice. We showed that the lower glucocorticoid levels observed in Cbg ko mice stems from their higher clearance from plasma. A study performed on Cbg ko female mice revealed that estrogens outpass CBG deficiency in inducing despair-like behavior. Additionally, we evidenced that CBG deficiency leads to lower behavioral and endocrine sensitivity to chronic stress, and we observed impairment of hippocampal-dependent long-term memory in these mice. Finally, we found that chronic stress combined to high-fat diet leads to alteration in glucose metabolism in CBG deficient animals. These findings reinforce the important role of CBG influencing the broad range of actions of glucocorticoids by modulating their levels and availability
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Weinblatt, Brian. "An Examination of Academic Decision-Making During Two University Mergers." University of Toledo / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1341245360.
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De, Sousa Vanessa Alexandre. "The impact of a merger on the motivational levels and organisational culture of amalgamated beverage industries employees in country region." Thesis, Bloemfontein : Central University of Technology, Free State, 2006. http://hdl.handle.net/11462/69.
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Thesis (M. Tech.) -- Central University of Technology, Free State, 2006In today’s dynamic and uncertain business environment, employees are required to work together to achieve a common goal. An organisation cannot survive without a highly motivated and progressive workforce. Management need to be highly innovative and adaptive, to survive the intensity of competition and change. This study is based on the conviction that enhancing and sustaining employee motivation is a manager’s major function. In effect, management need to create and maintain a culture that fosters motivation, and determine whether employees are culturally adaptable, when two established cultures merge as one. Against this background, the focus fell on attaining optimum performance and a culture that evokes a spirit of co-operation and is conducive to motivating employees to work willingly and effectively. The Amalgamated Beverage Industry was selected for the purpose of this study. The perceptions and opinions of management and that of the lower level employees were examined to determine the impact on the work motivational levels and organiastional culture within Country Region employees. A probable influence was also given on the possible factors contributing to the maintained level of organisational culture and the high motivational levels within ABI. Attention was also focused on culture change and its possible impact on employees.
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Dal, Bó Micheli. "Comunicação e comportamento organizacional no contexto de aquisição de empresa." reponame:Repositório Institucional da UCS, 2015. https://repositorio.ucs.br/handle/11338/1376.
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As empresas buscam, além da sobrevivência, diferenciar-se em um ambiente marcado pela competitividade. Deste modo, as operações de F&A (fusão e aquisição) tornam-se comuns, trazendo mudanças estruturais e culturais às empresas e afetando o comportamento organizacional. Isso se reflete em resistência às modificações propostas, o que pode determinar o fracasso dos processos. Nesse contexto, a comunicação pode ser fundamental, auxiliando nos processos de mudanças como um todo. Esta pesquisa teve por objetivo analisar a relação entre comunicação e o comportamento organizacional em uma empresa de processamento de proteína animal, que passou por constantes mudanças após um processo de aquisição. O método foi exploratório (estudo de caso) e quantitativo, sendo a população escolhida formada pelos funcionários operacionais, totalizando 584 pessoas. A coleta de dados foi realizada por meio de 258 questionários distribuídos por sorteio. Os dados foram analisados com auxílio do software SPSS versão 22.0. Os principais resultados indicam que a comunicação possui correlação positiva e significativa com as dimensões motivação, oportunidade de participação, incertezas sobre ambiente futuro e comprometimento organizacional. Na análise dos dados demográficos, foi possível concluir que o comprometimento organizacional apresenta variabilidade significativa em relação à idade dos respondentes e a dimensão motivação por recompensas externas apresenta variabilidade significativa em relação aos respondentes que residem ou não na vila da empresa. O grau de escolaridade responde por variabilidade significativa nas dimensões comprometimento organizacional e motivação pela satisfação das necessidades básicas.Submitted by Ana Guimarães Pereira (agpereir@ucs.br) on 2016-11-22T15:25:16Z No. of bitstreams: 1 Dissertacao Micheli Dal Bó.pdf: 1360808 bytes, checksum: fddb12653e1893d4fde09601f058df52 (MD5)
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Companies seek, in addition to survival, differentiate themselves in a competitive environment. In this way, operations of M&A (merger and acquisition) are common businessevents, bringing structural and cultural changes and affecting organizational behavior in affected companies. This may cause resistance to the proposed changes, which can determine failure of the M&A process. In this context, communication can be critical and can help the change process as a whole. This research aimed to analyze the relationship between communication and dimensions of organizational behavior in an environment of changes by way of acquisition. The method was exploratory (case study) and quantitative. A survey questionnaire was applied to 258 people randomly selected from a population of 584 front line employees. The data were analyzed using the SPSS software version 22.0. Main results indicate that communication has positive and significant correlation with motivation, opportunity to participate, uncertainty about the future and organizational commitment. In the analysis of demographic data, it was observed that organizational commitment has significant variability in relation to age of the respondents. Motivation due to external rewards had significant variability in relation to respondents who reside or not in the village built on the company's property. Level of education responded for significant variability in organizational commitment and motivation due to satisfaction of basic needs.
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Hopeck, Janell Marie. "Face-to-face communication versus memo communication to announce mergers and acquisitions the importance of media richness." CSUSB ScholarWorks, 2011. https://scholarworks.lib.csusb.edu/etd-project/140.
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The purpose of this study was to examine the current research on mergers and acquisitions which includes organizational factors, such as communication processes, and their impact on employee reactions. The current study addresses this issue through a simulated M&A announcement laboratory experiment with 156 CSUSB undergraduate students.
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Thomas, Stephen David. "The consolidation behaviour of gassy soil." Thesis, University of Oxford, 1987. http://ora.ox.ac.uk/objects/uuid:f13acb0c-3e1b-4122-b497-341869846561.
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The consolidation behaviour of gassy soil has been studied in a programme of experimental and theoretical research. This research is of particular importance to the offshore geotechnical industry as the presence of gas in the seabed can have a dramatic effect on the material properties of a marine sediment. Initial numerical modelling based on existing unsaturated soil theory combining the gas and the water phase into a compressible fluid in the pores of compressible soil skeleton failed to simulate the soil behaviour previously observed experimentally at Oxford. Therefore, there was scope for further study in this field. Chapters 2 to 4 describe the experimental preparation, consolidation technique and experimental results of the two series of tests on artificially prepared gassy soil samples. The results of these tests indicated that the gas appeared to be affected by the total stress rather than the pore water pressure, with the saturated soil matrix outside the gas voids being controlled by the consolidation stress. Chapter 5 presents the one-dimensional numerical modelling of the experimental results. Poor simulations were again made using compressible fluid theory. Treating the gas as compressible solid inclusions embedded in a saturated soil matrix, however, resulted in excellent simulations of the observed pore water pressures and settlements. Chapter 6 attempts to explain the results of the experimental and numerical modelling in terms of elastic and plastic soil behaviour. This includes the introduction to the double compressibility model in which the deformation behaviour of the saturated matrix is governed by changes in consolidation stress, whereas that of the gas is governed by changes in total stress. Chapter 7 presents the development of the governing gassy soil consolidation equations under both plane strain and axisymmetric conditions. Chapter 8 describes the approximation of the governing consolidation equations using the Galerkin finite element method in terms of nodal displacements and pore water pressures. The resulting finite element approximation is subsequently formulated for rectangular elements under plane strain and axisymmetric conditions in Chapter 9. The remainder of the thesis describes the structure of the finite element model DCFEM2 and the constitutive relationships that are required for such a model. The code is verified with existing analytical solutions and then is used to simulate the observed gassy soil behaviour under laboratory and field conditions.
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Kavanaugh, Bryan Palmer Schindler Anton K. "Creep behavior of self-consolidating concrete." Auburn, Ala, 2008. http://repo.lib.auburn.edu/EtdRoot/2008/SUMMER/Civil_Engineering/Thesis/Kavanaugh_Bryan_38.pdf.
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Beusch, Peter. "Contradicting management control ideologies : a study of integration processes following cross-border acquisitions of large multinationals /." Göteborg : BAS Publ, 2007. http://www.gbv.de/dms/zbw/548620407.pdf.
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Rui, Charles. "Cidadania organizacional e outras variáveis comportamentais atuantes em um ambiente de fusão." reponame:Repositório Institucional da UCS, 2011. https://repositorio.ucs.br/handle/11338/605.
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As organizações mudam suas práticas de gestão, muitas vezes realizando fusão, em razão de fatores externos como mudanças ou problemas sociais, políticos, ambientais e econômicos. Também variáveis internas como saúde financeira, estilos de gestão, diferenças culturais, níveis diferentes de conhecimento, envolvimento e comprometimento reduzido, medo, entre outros, podem influenciar o comportamento nas organizações. A empresa foco desta pesquisa, denominada Alfa, com objetivos estratégicos de expandir seus negócios, e ser mais competitiva no mercado, em dezembro de 2008 vendeu parte de sua composição acionária (49%) para uma empresa caracterizada como Beta. Dentro desse contexto, esta pesquisa foi desenvolvida com funcionários da empresa Alfa, localizada na cidade de Caxias do Sul. O objetivo deste trabalho foi medir aspectos de comportamento organizacional em um ambiente de fusão de empresas. A pesquisa foi classificada como exploratória (estudo de caso), do tipo quantitativo, cujos dados foram processados utilizando-se técnicas tais como: análise fatorial, Anova e regressão linear múltipla. Foram utilizadas escalas pré-validadas para o bloco de comportamento organizacional e foi desenvolvida uma escala para medir e identificar as variáveis qualificadoras num ambiente de fusão. Como resultados foram identificados, entre os respondentes, graus moderados de comportamento organizacional com variabilidade significativa em diferentes subgrupos da população. As variáveis comportamentais significativas, extraídas do instrumento de pesquisa foram: comprometimento organizacional, cidadania organizacional (iniciativa, lealdade e fidelidade) e satisfação no trabalho. Em relação às variáveis qualificadoras da fusão apareceram significativas: trabalho e tarefa, motivação e comunicação. Percebeu-se que o conjunto de variáveis comportamentais identificadas podem ser responsáveis pela definição da cultura organizacional, a qual representa a forma de agir, de liderar, de resolver conflitos, de solucionar os problemas, de obter resultados, isto é, a maneira de administrar a empresa.Submitted by Marcelo Teixeira (mvteixeira@ucs.br) on 2014-06-05T16:07:10Z No. of bitstreams: 1 Dissertacao Charles Rui.pdf: 2448400 bytes, checksum: cdd07738126dd6361aeb34d131e344ba (MD5)
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Organizations change their management practices, sometimes after a process of merging, due to external factors such as changes or social, politics, environmental, and economic problems. It also happens due to internal variables such as financial health, management styles, cultural differences, different levels of knowledge, reduced commitment, fear, and others that may influence behavior of the organizations. The company, focus of this research, named Alpha, with the strategic purpose of expanding their businesses and to be more competitive in the market, sold part of it s shareholding (49%) to a company described as Beta in December, 2008. Within this context, this research was carried out with Alfa employees, in Caxias do Sul. The purpose of this study was to measure aspects of organizational behavior in a company merger environment. The research was classified as quantitative, exploratory (a case study), in which the data were processed using statistical techniques like factor analysis, Anova and multiple regression analysis. Pre-tested scales were used for the organizational behavior set and a new scale was developed to measure and identify the qualifying variables in a merger environment. The results identified moderate degrees of organizational behavior among the respondents, with significant variability in different sample subgroups. The significant behavioral variables extracted from the research instrument were: organizational commitment, organizational citizenship (initiative, loyalty and fidelity), and job satisfaction. The merger qualifying variables extracted were: work and task, motivation, and communication. It was noticed that the set of behavioral variables identified may be responsible for defining organizational culture, which represents the way of acting, leading, resolving conflicts, solving problems, achieving results, i.e., the way of managing the company.
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Ovando, Shelley Efrain. "Stress-strain behaviour of granular soils tested in the triaxial cell." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/7891.
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Harb, H. M. "An investigation into the normal consolidation behaviour of viscous clays." Thesis, Bucks New University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378379.
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Jarad, Nidal. "Temperature impact on the consolidation and creep behaviour of compacted clayey soils." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0251/document.
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La consolidation des sols argileux est un enjeu majeur dans le domaine de la géotechnique pour la conception des ouvrages. Ceci est notamment le cas lorsque les sols argileux peuvent être exposés à des cycles thermiques, comme dans le cas des géostructures géothermiques, dépôts de stockage des déchets nucléaires, stockage de chaleur dans les remblais, etc. Ces changements de température pourraient avoir une incidence sur le comportement de consolidation des sols, tant du point de vue de la consolidation primaire que du fluage. Dans ce contexte, cette étude a examiné l'impact de la température sur le comportement de consolidation et du fluage d’argiles compactées saturées. L’impact de la nature du sol et de son histoire mécanique a été considéré. Une cellule œdométrique à température contrôlée a été utilisée pour effectuer des essais à vitesse de déformation constante (CRS) pour différentes vitesses de déformation (0,002% / min à 0,02% / min) dans une gamme de température comprise entre 5 ° C et 70 ° C. Deux argiles compactées, avec différentes histoires de chargement mécanique, ont été utilisés. Les résultats indiquent que les indices de compression et de gonflement pour les deux matériaux ne sont que légèrement modifiés par une augmentation de la température allant de 5 à 70°C. En revanche, la pression de préconsolidation des deux argiles diminue à mesure que la température augmente, cet effet étant cependant fonction de la nature du sol considéré. Le coefficient de consolidation augmente lorsque la température augmente pour les deux matériaux, ainsi que la conductivité hydraulique. La perméabilité intrinsèque reste stable en fonction de la température. L'indice de fluage augmente lorsque la température augmente pour les deux argiles. En outre, l'histoire des chargementsmodifie l’impact de la température sur le comportement mécanique. Ainsi, les résultats montrent une dilatation thermique pour les sols fortement surconsolidées et une contraction thermique des échantillons faibles et normalement consolidés. Cette étude a ainsi permis de mettre en évidence l’impact relatif d’un certain nombre de paramètres sur l’évolution du comportement des argiles compactées avec la températureConsolidation of clay soils is one of the main challenges in engineering design and construction. Clayey soils could be exposed to thermal cycles in some engineering applications such as geothermal piles, nuclear waste storages, heat storage in embankments, etc. These temperature changes could affect the primary consolidation as well as the creep behaviour of the soils. In this context, this study investigated the impact of temperature on consolidation behaviour and creep behaviour of saturated compacted clays. In addition, the impact of stress history and clay nature on the temperature dependent mechanical and hydraulic behaviours was also considered. Temperature controlled oedometric cells were employed to perform constant rate of strain (CRS) consolidation tests for different strain rates (0.002%/min to 0.02%/min) within a temperature range of 5° C to 70o C. Two different compacted saturated clays with different stress histories were used in these CRS tests (clay A: PI=31%, clay B: PI=23.8%). The results showed that the compression and swelling indices for both materials changed slightly with temperature and strain rate alteration. The preconsolidation pressure of both clays decreased as the temperature increased, but less in the case of clay B, while it decreased as the strain rate decreased for both materials. The hydraulic conductivity increased with temperature while the intrinsic permeability remained unchanged in the investigated range of temperature. The creep index increased as the temperature increased for both clays. In addition, the stress history has an impact on the temperature dependent mechanical and hydraulic behaviour of clay soils. Results showed a thermal dilation for highly overconsolidated soils and a thermal contraction for low and normally consolidated samples. The relative impact of several parameters on the modification of the behaviour of compacted clays with temperature was also assessed
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Chan, Chung Yie. "Centrifuge modelling of behaviour of piles in consolidating ground /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202004%20CHAN.
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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2004.Includes bibliographical references (leaves 180-185). Also available in electronic version. Access restricted to campus users.
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Nguyen, Van Tuan. "Apport de la modélisation multiphasique à l’analyse du comportement macroscopique de matériaux renforcés par fibres." Thesis, Paris Est, 2013. http://www.theses.fr/2013PEST1034/document.
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Une modélisation récente, qualifiée de multiphasique, permettant de décrire le comportement des ouvrages en sols renforcés par inclusions a été développée et intégrée dans un code de calcul par éléments finis. Le champ d'application de cette approche a été étendu pour rendre compte du comportement macroscopique de matériaux à fibres tels que le plâtre, le béton de fibres, les ouvrages en sol renforcés par des fibres et les tissus osseux qui présentent une microstructure constituée d'une matrice et d'une distribution de fibres plus ou moins longues orientées dans toutes les directions de l'espace. Cette approche est d'abord mise en œuvre pour déterminer le comportement élastique du composite à fibre, les résultats obtenus sont comparés à ceux fournis par les schémas d'estimation dilué et de Mori Tanaka, basés sur la solution d'Eshelby, la suite de ce travail est consacrée au développement du modèle dans le cadre d'un comportement anélastique des constituants. Des solutions analytiques ont été développées permettant de retrouver le comportement macroscopique des matériaux à fibres sous certaines sollicitations simples dans le cadre d'un comportement élasto-plastique ou élastique-fragile des différents constituants. Le modèle est par la suite mis en œuvre numériquement dans le cadre de la méthode des éléments finis permettant d'accéder à la réponse de structures en matériaux à fibresA multiphase model has been recently developed and integrated into a finite element based code for the analysis and design of soil structures reinforced with linear inclusions. This approach is extended to account for the macroscopic behavior of fiber reinforced materials such as plaster, concrete fiber, soil reinforced by short fibers and bone tissues, which are constituted of a matrix and a distribution of continuously oriented fibers. The proposed model is performed to evaluate the elastic macroscopic stiffness of the composite material, the obtained results are compared to those deriving from the dilute and Mori-Tanaka estimations. The model is then extended to take into account a nonelastic behavior of the constituents. Starting from the derivation of some analytical solutions to boundary value problems involving fiber reinforced materials in the context of elasto-plastic and brittle behavior of the matrix and fibers, a f.e.m.-based code is developed and applied to simulating the behavior of some typical structures
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Ting, Chi Man Roger. "Controlled gradient consolidation of soft soils with reference to the development of Kâ†o." Thesis, University of East London, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.258762.
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Cohen, Michael I. "Structural Behaviour of Self Consolidating Steel Fiber Reinforced Concrete Beams." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23101.
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When subjected to a combination of moment and shear force, a reinforced concrete (RC) beam with either little or no transverse reinforcement can fail in shear before reaching its full flexural strength. This type of failure is sudden in nature and usually disastrous because it does not give sufficient warning prior to collapse. To prevent this type of shear failure, reinforced concrete beams are traditionally reinforced with stirrups. However, the use of stirrups is not always cost effective since it increases labor costs, and can make casting concrete difficult in situations where closely-spaced stirrups are required. The use of steel fiber reinforced concrete (SFRC) could be considered as a potential alternative to the use of traditional shear reinforcement. Concrete is very weak and brittle in tension, SFRC transforms this behaviour and improves the diagonal tension capacity of concrete and thus can result in significant enhancements in shear capacity. However, one of the drawbacks associated with SFRC is that the addition of fibers to a regular concrete mix can cause problems in workability. The use of self-consolidating concrete (SCC) is an innovative solution to this problem and can result in improved workability when fibers are added to the mix. The thesis presents the experimental results from tests on twelve slender self-consolidating fiber reinforced concrete (SCFRC) beams tested under four-point loading. The results demonstrate the combined use of SCC and steel fibers can improve the shear resistance of reinforced concrete beams, enhance crack control and can promote flexural ductility. Despite extensive research, there is a lack of accurate and reliable design guidelines for the use of SFRC in beams. This study presents a rational model which can accurately predict the shear resistance of steel fiber reinforced concrete beams. The thesis also proposes a safe and reliable equation which can be used for the shear design of SFRC beams.
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Kumar, Garimella Vijaya. "Some aspects of the mechanical behaviour of mixtures of kaolin and coarse sand." Thesis, University of Glasgow, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318903.
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Khansari, Hossein. "An investigation of one-dimensional compression and consolidation of intact and reconstituted Bothkennar soft soil." Thesis, University of the West of England, Bristol, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337381.
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Levy, Kelly Rebecca. "Bond behavior of prestressed reinforcement in beams constructed with self-consolidating concrete." Auburn, Ala., 2007. http://repo.lib.auburn.edu/2007%20Spring%20Theses/LEVY_KELLY_6.pdf.
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Bennion, Kelly Ann. "How sleep affects memory for future-relevant information: Behavioral and neuroimaging investigations." Thesis, Boston College, 2016. http://hdl.handle.net/2345/bc-ir:107196.
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Thesis advisor: Elizabeth A. KensingerResearch in three parts investigated sleep’s preferential consolidation of memories for experiences that are prioritized at encoding due to intrinsic characteristics (e.g., emotion), extrinsic characteristics (e.g., instructed learning, reward), or both. Results showed that sleep broadly strengthens memory for future-relevant information, with these prioritization cues at encoding aiding in the selection process for what is subsequently strengthened during sleep. Part I investigated the effects of sleep on the consolidation of information that was prioritized at encoding due to the intrinsic cue of emotion. Results showed that even once the emotionally salient aspect of the stimuli was removed (i.e., when memory was tested using a neutral cue), residual effects of emotion were reflected in enhanced visual activity following sleep, with this visual activity correlating with the percentage of rapid eye movement sleep obtained during consolidation and likely driven by enhanced occipital-hippocampal connectivity following sleep. This suggests that sleep prioritizes information that was salient due to the intrinsic cue of emotion at encoding, leading to changes in neural activity during retrieval even once that intrinsic cue is no longer present. As in Part I, most prior research has examined how sleep preferentially consolidates memory for information that is salient due to a single cue for future relevance. Part II investigated whether future relevance can be assigned to stimuli via top-down manipulations (i.e., extrinsic prioritization cues), as well as how sleep prioritizes memory for information when intrinsic and extrinsic cues for future relevance co-occur within the same stimuli. Results suggest that when multiple dimensions of future relevance co-occur, sleep prioritizes extrinsic cues (i.e., instructed learning, and to a lesser degree, reward) over intrinsic cues (i.e., emotion). Further, results suggest that additional cues for future relevance do not have additive effects on consolidation, but rather that sleep may binarize information based on whether it is future-relevant or not, preferentially consolidating memory for the former category. Lastly, Part III focused on a manipulation of extrinsic prioritization at encoding to investigate both how the effects of prioritization on memory differ minutes after encoding relative to after long-term consolidation processes take place, and also whether these effects depend on if a healthy versus restricted amount of nocturnal sleep is obtained during the consolidation interval. Results showed that a top-down manipulation of prioritization (i.e., typographical cueing) was effective in enhancing memory; highlighted relative to non-highlighted content was better remembered at multiple time points, with evidence suggesting that N3 (slow-wave) sleep may contribute to these memorial benefits. Together, findings across Parts I-III suggest that sleep selectively strengthens future-relevant information, elucidating which cues for future relevance at the time of encoding lead to enhanced consolidation following sleep, as well as how sleep acts on intrinsic and extrinsic prioritization cues when they co-occur. In identifying intrinsic targets of sleep’s selective consolidation effects, as well as extrinsic manipulations that can be applied to use sleep as a tool to enhance consolidation, these three studies have important implications for optimizing memory that are relevant across domains
Thesis (PhD) — Boston College, 2016
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Psychology
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Ahmed, Syed Iftekhar. "A new approach for modeling the non-linear one dimensional consolidation behaviour of tailings." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/44810.
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The management of tailings largely depends on its consolidation behaviour. Extensive works on this sector have been performed as it plays a significant role in economic and environmental considerations of a tailings management facility. To resolve these issues, consolidation theories had been developed for one, two or three dimensional condition with numerical solutions for soft soils like tailings which behave differently from natural soils. Eventually, large strain consolidation tests have experienced at its advance level for precise determination of experimental data because non-linear behaviour of compressibility and hydraulic conductivity fits to a wide range of functions. This non-unique behaviour of tailings is believed to be an aftermath of the combination of flocculation, sedimentation, consolidation, segregation, deposition, freeze-thaw and desiccation phenomena. Similarly, a consequence of several factors combined called “apparent over-consolidation” is a mystery to the tailings industry and the reasons for this occurrence are not fully understood. It is believed to be the result of the combination of several contributing factors at low effective stresses. Previously, it was assumed that tailings are normally consolidated or consolidating under the load of mounting deposited materials and numerical modeling had been performed by different researchers based on this assumption. However, the apparent compressibility behaviour of tailings was noticed for different types of tailings at a wide range of solids content and various types of testing procedures. Conducting statistical analysis, a new compressibility function, one of the forms of Weibull distribution, is proposed to fit the void ratio-effective stress relationship considering pre-consolidation behaviour. A fully implicit model was developed by introducing that proposed compressibility equation to predict the tailings long term consolidation behaviour. A case study was performed for different types of tailings to predict the consolidation behaviour followed by the sensitivity analysis of the developed model. Significant effects of apparent consolidation have been observed on void ratio, effective stress, excess pore water pressure and tailings settlement for a period of 50 years. The major outcome of this study is the consideration of apparent over-consolidation behaviour during the early stage of the deposition helps to formulate the model more precisely.
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Phang, Ignatius Ren Kai. "Investigation of Strength and Consolidation Behaviour of Peat Treated Using Microbial-Induced Calcite Precipitation (MICP)." Thesis, Curtin University, 2021. http://hdl.handle.net/20.500.11937/86928.
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The study of Microbial-induced carbonate precipitation (MICP) on organic soil has remained limited. This PhD study intends to fill the knowledge gap by studying MICP of tropical peat. Based on the finding, it was possible (i) to isolate bacteria strains from acidic tropical peat with high urea hydrolysis activities and capable of bio-cementation; (ii) to induce bio-cementation in acidic peat, which leads to strength gain and reduction of permeability; (iii) to improve consolidation behaviour.
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Green, Willie III. "The Impact of City-County Consolidation upon Political Participation within Rural Georgia." DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 2016. http://digitalcommons.auctr.edu/cauetds/42.
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Previous studies of urban consolidations suggest that black and female political participation is negatively impacted by city-county consolidation. However, researchers know little regarding the impact of consolidation upon minority political participation within rural counties. This study examines the belief that blacks and women are negatively impacted by consolidation. This study examines pre- and post-consolidated data for selected forms of political participation for blacks and women over a 19-year period for three rural consolidated governments in the state of Georgia. Three significant findings emerged from this study. First, the results suggest that black political participation actually increases within rural consolidated governments. Secondly, female political participation does seem to be adversely impacted by rural consolidations. Lastly, this study found that the political participation of the general electorate had increased over the study period. A number of possible explanations for the findings are noted and the implications of consolidation for black and female political participation within rural consolidated counties are discussed.
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Bartholomeeusen, Gert. "Compound shock waves and creep behaviour in sediment beds." Thesis, University of Oxford, 2003. http://ora.ox.ac.uk/objects/uuid:f1ba2e5c-60b7-4d18-ae02-69356a289290.
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This research is a theoretical, experimental and numerical study of the one-dimensional deformation of suspensions. The study is focussed on the transition between sedimentation and consolidation, and creep during soil consolidation. In the literature, sedimentation, traditional large strain consolidation and creep are explored independently. The theory of sedimentation has been derived in parallel with the mathematical description of shock waves. The large strain consolidation theory of Gibson et al. (1981) has been adopted, and attention is given to the material properties of compressibility and permeability. Traditionally creep has been studied on thin samples, and a review is given to identify parallels with creep behaviour of the thick samples studied here. The experimental work was carried out in the laboratory using settling column tests. During the sedimentation stage, when the soil particles are fluid supported, shock waves were monitored and tracked by means of an X-ray absorption technique to allow for the calculation of experimental flux functions. Settling column experiments on different natural soils have been performed to study the consolidation behaviour by means of the measurement of pore water pressure and X-ray density measurements. An in-depth study of the development of effective stress has been performed to quantify the creep behaviour of the soils studied in a strain rate surface. The sedimentation equation is classified as a hyperbolic partial differential equation. In this kind of equation, discontinuities can propagate, and standard solution methods, eg finite differences, fail to give adequate results. For this reason codes have been developed using the finite volume method (FVM) to solve the sedimentation equation numerically. A standard numerical code has been developed for the solution of the large strain consolidation equation, while for the unified sedimentation-consolidation model the finite volume method (FVM) has been used. The shock waves monitored in the experiments are successfully predicted by the sedimentation model using experimentally derived flux functions. This study made it possible to formulate a physically and mathematically correct definition of the transition from sedimentation to consolidation. The strengths and weaknesses of the traditional large strain consolidation model have been identified by means of an international Class A prediction seminar. A new unified sedimentation-consolidation model is proposed using a flux function, a permeability relationship and a strain rate surface as material functions. Successful predictions of experiments have been performed, showing the transition from sedimentation to consolidation and the inclusion of creep.
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Vu, The Manh. "Comportement des tunnels en terrains tectonisés : application à la liaison ferroviaire Lyon-Turin." Phd thesis, Université Paris-Est, 2010. http://tel.archives-ouvertes.fr/tel-00601061.
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Elder, Donald McGillivray. "Stress strain and strength behaviour of very soft soil sediment." Thesis, University of Oxford, 1985. http://ora.ox.ac.uk/objects/uuid:48050e2f-832d-47f4-9e3b-b922176f451b.
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Introduction: When fine grained natural sediments or artificially produced waste materials are transported and deposited through water, several different phases of behaviour are observed. These have been described variously as suspension, free settling, compression settling, intermediate and consolidating soil phases. Transitions between each are not always distinct in terms of material properties or behaviour and time spent in the early phases before a conventional soil state is attained can be a significant proportion of the total period of engineering interest. The eventual state attained following procession through these stages may be very different to that if the soil had been remoulded at the same final density. Standard engineering models exist which can describe soil behaviour well in separate phases under particular conditions, but these are of limited validity when extended to more general conditions and wider volumetric ranges than those for which they were formulated. The number of factors required to describe the entire range of behaviour is consequently larger than that for any one phase, and many of these factors are more familiar in fields of chemistry, geology or sedimentology than in classical soil mechanics. This thesis discusses, in engineering terms, the engineering behaviour observed in a particular soil during the general sedimentation and self weight consolidation process. In the second chapter existing knowledge about behaviour at zero or low stresses is reviewed and evaluated with respect to common assumptions made, often implicitly, in formulating predictive models. It is shown that while these models have been extensively developed to a stage where they can approximate many aspects of soil behaviour, the lack of fundamental investigations carried out in parallel with their development has often led to inadequate appreciation of the causes of discrepancies between modelled and real behaviour. This has occurred particularly where standard geotechnical testing equipment and methods devised for stiff soils have been used to obtain global average relationships between engineering parameters. Even where modified tests have been developed, instrumentation has sometimes been inadequate and measurements too infrequent, so that data available have necessarily been analysed only in terms of constitutive forms assumed already. In chapter three experimental techniques are proposed which, where possible will allow soil behaviour to be examined under the least restrictive conditions of one dimensional compression so that basic engineering concepts may be analysed. Chapter four describes the testing programme and presents direct results of experiments. Chapter five analyses compression behaviour and establishes some trends which can be observed for particular parameters and relationships, and which exist between experiments under different initial and boundary conditions. Similar analysis of strength behaviour is undertaken in chapter six, where results obtained using different testing methods are compared. In the final chapter the general relevance of these results and their implications for engineering problems are discussed. Some suggestions are made for future work. Areas of application Improved knowledge about cohesive waterborne sediments can result in considerable savings for related industries. In the United Kingdom the annual cost of maintenance dredging is £25m (I.C.E. Costal Engineering Research Panel, 1985). In East Coast ports alone reduction of the distances travelled by each dredger would lead to a saving of £270,000 per annum, per kilometre reduction. Studies at Rotterdam Europort (Kirby, Parker, van Oostrum, 1979) show that although a channel dredged recently may quickly refill with sediment to a depth which echo-sounding techniques might indicate to be unnavigable, the strength may be so low as to allow passage of vessels virtually unimpeded. A density of 1.2 Mg/m3 is now used by the Rijkswaterstaat to define the "Nautical Depth" of a channel, stated to be "a density within the suspension above whose altitude vessels can safely sail." Dredging control using information from gamma ray densimeters has enabled production increases of up to 50% to be obtained in the Europort area. In the United States $30m was spent in a 5 year period on a dredging research programme aimed at improving disposal methods (Haliburton, 1977). Considerable volumes of waste material are also produced by the mining industry. The phosphate industry in Florida produces 40 million tons by dry mass per annum at an initial 3% solids by mass which even after two years retains void ratios around 10, due to the high content of attapulgite, a clay mineral consisting of long fibrous particles with large specific surface. Disposal areas for these clays occupy over 50,000 acres and are surrounded by 300 miles of dams, posing significant environmental and safety problems (Bromwell, Oxford, 1977). Failures of underwater slopes have been well documented. In muds deposited recently in the Mississippi Delta area very low shear strengths combine with apparently high excess pore pressures and presence of gas bubbles to cause instability for slope angles less than 1°. Recent research carried out a Oxford suggests that presence of gas may cause high excess pressures to be deduced where none exist. Duncan and Buchignani (1973) analysed a slope failure in San Francisco Bay which occurred during cutting of a slope from a normally consolidated clayey silt. The importance of accurate determination of an in situ parameters for analysis was shown by the estimated saving of $200,000 through using a slope of 7:8 rather than 1:1, decreasing the supposed safety factor from 1.26 to 1.17. Analysis of error sources showed that an error of only 4% in the soil density could reduce this safety factor by 10%. Similar problems due to changes in loading or boundary conditions occur where natural changes, such as increase in water current, cause erosion of a sediment layer which might, for example, be supporting an underwater cable or pipeline. In all these areas in situ property determination in solid of low density provides major problems. Density is often the only quantity that can be measured both accurately and continuously and then only when a stable platform can be maintained. Recovery of high quality samples from these layers is virtually impossible, so that there is a strong need for correlations between density and other properties such as strength and compressibility.
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Chiu, Sing-Lok. "Behaviour of normally consolidated clay at elevated temperature." Thesis, The University of Sydney, 1996. http://hdl.handle.net/2123/18126.
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Not much has research work been done so far on temperature-related behaviour of clays. This theme has not received much attention of research workers in this field for a long time until the late 1960s when Campanella and Mitchell published their paper on "Influence of Temperature Variations on Soil Behaviour" in 1968 (Campanella and Mitchell, 1968). What followed was a special conference on this subject held in Washington in 1969, addressing a variety of research results in this field at that time. However, the interest of most research workers in the following two decades has been in soil models and their numerical implementation. Most research funds have been channelled towards studies concerning basic soil properties and the implementation of the results of research than to other topics in the same time. In recent years, rapid industrialization and implementation of many military technologies into civil industries have taken place in many western countries and a few other countries in Asia. This gave rise to a variety of problems related to the disposal of nuclear waste particularly in the late 1980s. A series of studies regarding disposal problems of nuclear waste were then carried out in Italy and the United States (Hueckel et al, 1990). In Australia, the first project related to this topic was awarded in 1991 to the Centre for Geotechnical Research (CGR) at School of Civil and Mining Engineering, University of Sydney. This thesis contains the results obtained from triaxial tests performed at different elevated temperatures using a new triaxial apparatus called HTTA (High Temperature Triaxial Apparatus) specially designed for and forming part of, the work in this research. The thesis also contains a comparison of the experimental results and the predictions by different Cam-clay models including the revised Camclay model developed in this research. Specimens of a remoulded clay, Kaolin CIC, have been tested at various I temperatures ranging from ambient temperature of 22±2°C to 100±5°C with two triaxial apparatuses. The first apparatus for tests at ambient temperature is a Bishop- Wesley-Type hydraulic triaxial apparatus; the other is a modified triaxial apparatus specially tailored and assembled for performing triaxial tests on the specimens at various elevated temperatures. The triaxial tests on the specimens were conducted at room temperature as well as at two elevated temperatures, namely 50°C and 100°C. Stress-strain response of the specimens at different temperatures was observed. Attempts have been made in different ways to investigate whether soil properties of the selected clay would change with temperature. Further, the attempts made were also to see what have been changed in the stress-strain behaviour of the clay at different elevated temperature. Then, the test results from different elevated temperatures were compared with those obtained from the tests at room temperature; and also compared with the predictions by the Cam-clay models.
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Aghniaey, Nima. "Behaviour of Self Consolidating Steel Fiber Reinforced Concrete Beams Under Reversed Cyclic Loading." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/23785.
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Concrete is a very weak and brittle material in tension. It has been shown in previous researches that the addition of steel fibers to a concrete matrix can improve this behavior. The ability of fibers to control and redistribute stresses after cracking results in a number of improvements in the structural behaviour of concrete. A review of existing literature shows that the addition of steel fibers enhances concrete’s tensile resistance, crack control properties, ductility and damage tolerance. In beams, fibers can transform brittle shear response into a flexural response and promote ductility, thereby allowing for a full or partial replacement of traditional shear reinforcement. The enhanced shear capacity, ductility and damage tolerance of Steel Fiber Reinforced Concrete (SFRC) can also potentially be used to relax seismic detailing requirements in frames by partially replacing the required transverse reinforcement in the plastic hinge regions of RC beams.
One of the drawbacks associated with SFRC is that the addition of steel fibers to a traditional concrete mix at high fiber contents can result in workability problems. The combined use of Self-Consolidating Concrete (SCC) and fibers can solve this problem and facilitate placement for a wider range of structural applications.
Although several studies have been conducted on the behaviour of SFRC beams subjected to monotonic loading, there is limited research on the behaviour of SFRC beams under cyclic or reverse-cyclic loading. This thesis presents the results of an experimental and analytical study conducted on nine SFRC beam specimens tested under load reversals. The main objective of this research program was to investigate the effect of fibers on structural behaviour and to examine the ability of steel fibers to replace transverse reinforcement. The experimental and analytical results show that use of fibers results in several improvements in behaviour, including enhanced damage tolerance and post-peak ductility. The results also show that steel fibers can potentially be used to allow for a reduction of transverse reinforcement in beams, however further research is required.
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Sariñana, Joshua Jr. "Genetic and behavioral discrimination of dopamine 1 and 5 receptors in hippocampal dependent memory consolidation." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68424.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Brain and Cognitive Sciences, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references.
Dopamine (DA) containing neurons project throughout the brain. DA has been implicated in mediating brain disorders such as Schizophrenia, Parkinson's disease, Huntington's disease and drug addiction. The role of DA in working memory and procedural learning is also well established. DA is a ubiquitous neurotransmitter that affects much of the brain, but very little is known how dopamine functions in hippocampal dependent learning. It was only until recently that dopamine-containing neurons were found to project to the hippocampus. Even less understood are the expression patterns of DA receptors within the hippocampus and this is underlined by the inability of distinguishing the dopamine 1 receptor family (D1 and 5 receptors (D1/D5Rs)). Given the interaction of the D1 family with similar G-protein coupled receptors it has been assumed that these two receptors function in an analogous fashion. Additionally, the specific expressional pattern of each receptor lacks clarity due to non-specific binding by molecular probes. Moreover, D1 and D5 pharmacological and global KO studies cannot and have not functionally delineated D1Rs from D5Rs and global KOs of the D1Rs or D5Rs are not specific to the hippocampus, thus compensatory mechanisms likely ameliorate most physiological and behavioral deficits. Still, the aforementioned studies do point to the D1 family in modulating hippocampal synaptic plasticity, learning and memory consolidation. In order to characterize D1Rs distinctly from D5Rs we have generated three strains of conditional mutant mice (D1 KO, D5 KO, D1/5 KO). I present data that shows distinct expression patterns within the hippocampus, the importance of D1 Rs and D5Rs in modulating hippocampal plasticity, and hippocampal dependent learning. These data highlight distinct functional roles of D1Rs and D5Rs in hippocampal function.
by Joshua Sariñana Jr.
Ph.D.
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PEREIRA, ERIC VALLOTTI. "INFLUENCE OF STEEL FIBERS IN THE MECHANICAL BEHAVIOR AND CRACKING MECHANISMS OF SELF-CONSOLIDATING CONCRETES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2017. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=31466@1.
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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIROCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE EXCELENCIA ACADEMICA
No presente trabalho foi investigado o comportamento mecânico de um concreto autoadensável reforçado com fibras de aço. Foram utilizadas fibras de aço torcidas e com ganchos, nos comprimentos de 25, 30 e 60 mm e diâmetros de 0,5, 0,62 e 0,75 mm. Para cada uma destas fibras e para cada uma das frações volumétricas investigadas (0,5, 1,0 e 2,0 por cento) foram realizados os ensaios de flexão em quatro pontos em corpos de prova prismáticos e de tração direta em corpos de prova do tipo dog bone shaped. Nos ensaios de flexão, os índices de tenacidade e as cargas residuais foram contabilizados. Alternativamente, determinou-se a energia absorvida nos ensaios de flexão de painéis circulares conforme a ASTM C1550, cuja abertura de fissuras foi medida com o auxílio de transdutores de deslocamento. Os corpos de prova reforçados com fibras de aço submetidos à tração direta se mostraram mais dúcteis com relação à matriz de concreto autoadensável, observando-se grande influência do volume e comprimento ancorado das fibras nas cargas residuais da zona de pós-fissuração. Nos ensaios de flexão, observaram-se grandes incrementos na tenacidade e deformações correspondentes às cargas residuais. Por fim, analisou-se a influência desses concretos no comportamento de vigas armadas sujeitas à flexão. A evolução da abertura de fissuras foi monitorada com sistema de correlação digital de imagens, sendo posteriormente correlacionadas com cargas aplicadas e com os deslocamentos obtidos nos ensaios. Observou-se nestes ensaios, que o reforço fibroso aumentou a capacidade de carga e a rigidez à flexão, atrasando consideravelmente o surgimento de fissuras.
In the present work the mechanical behavior of a self-consolidating concrete reinforced with steel fibers was investigated. Twisted and hooked end steel fibers were used in lengths of 25, 30 and 60 mm and diameters of 0.5, 0.62 e 0.75 mm. For each of these fibers and for each volumetric fractions investigated (0.5, 1.0 and 2.0 percent), the four-point bending tests on prismatic specimens and direct tensile in dog bone shape specimens were performed. In the flexural tests, the toughness and residual strengths were computed. Alternatively, the energy absorption capacity in the round panel tests was determined following the ASTM C1550. During the test the crack opening was measured through displacement transducers. The steel fiber reinforced concrete subject to direct tensile loading was more ductile than the self-consolidating concrete matrix, showing a high influence of the volume and embedded length of the fibers in the residual loads in the post-cracking zone. In the bending tests, a large increase in the toughness and strains corresponding to the residual loads were observed. Finally, the influence of the fiber reinforced concretes on the behavior of reinforced beams subject to bending was investigated. The evolution of the crack openings was monitored with a digital image correlation system and correlated to the applied load and displacements. It was observed in these tests that the fibrous reinforcement considerably increased the load capacity and flexural stiffness, delaying the crack growth.
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Huang, Chou-Hui, and 黃綢輝. "Consolidation Behavior under Time Dependent Loading." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/25892148722576680863.
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Chen, Chia-Hao, and 陳家豪. "K0 Consolidation Behavior of UnsaturatedLateritic Soil." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/t62qwm.
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碩士國立臺北科技大學
土木與防災研究所
97
Terzaghi’s one-dimensional consolidation theory that relates pore water pressure to settlement has been successfully applied to saturated soil. However, the use of this theory to unsaturated soil has rarely even been discussed. In this study, unsaturated K0 consolidation experiments that involved constant water content test, consolidation testand increase of matric suction test have been used to investigate the changes in water and soil volumes change of unsaturated lateritic soil. The experiments were conducted in an oedometer-type ring placed in an advanced triaxial apparatus for unsaturated soils. The one-dimensional consolidation theory was then used to compare and contrast the experimental resutl. Good agreement has been obtained between the two sets of result.
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Fu, Chih-Ho, and 傅志和. "Research of Consolidation Behavior of Composite Soils." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/82085720797688611413.
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han, Lin wei, and 林韋翰. "Students use credit card consolidation Behavior Model." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/17247007334029032789.
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碩士高苑科技大學
經營管理研究所
98
In this study, the above theory of planned behavior (Theory of Planned Behavior; abbreviated TPB) analysis, then a literature review and survey papers by searching out the students used a credit card that may affect the behavior intention of the main factors to construct a "credit card consolidation behavior of college students intention model "to verify the TPB theory using a credit card for college students the explanatory power of behavioral intention, to this study on the practical management help for credit card industry as a sales strategy to set the considerations. Statistics showed that university students "attitude", "subjective norm", "perceived behavioral control" and other beliefs, the use of credit cards will indeed have a significant impact behavioral intention, which "attitude" for the acts of faith intention of significantly higher ; followed by "perceived behavioral control", and "subjective norm" of the least significant; for the descriptive analysis showed that: 1. Attitude, Belief and analysis of more than 65% of college students are asked to keep a positive attitude items, only 10 % of students held a negative attitude. 2. Subjective normative beliefs of more than 67% of the students will listen to (friends, colleagues) the views of the more than 63% of the students held positive attitudes, which means that the surrounding environment or organizational groups affect college students use credit cards force. 3. The analysis of perceived behavioral control beliefs, more than 70% consider themselves to have sufficient financial capacity and self-control of external resources to engage in credit card behavior. 4. Behavioral intention of 62% of the students in the short term will have to use credit cards. The study results indicated that college students will be "attitude, subjective norm, perceived behavioral control" beliefs influence behavioral intention to use credit cards, it is suggested: 1. "Attitude" of the proposal - suggested that the domestic credit card industry, the design of the program should be continued the humane use of repayment, and gifts to enhance the quality, to increase the students will use credit cards. 2. "Subjective norm" of the proposal - the proposed credit card industry, in addition to maintaining brand reputation, product packaging and marketing of advertising as deeply moving as well as business people use the Internet and other marketing channels to get the credit card consumers. 3. "Perceived behavioral control" of the proposal - the proposed credit card industry can strengthen cooperation with the super-business alliance to provide students who facilitate the payment method, and strengthen sales and service.
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Tan, Chih-Hao, and 譚志豪. "The Behavior of Compression and Consolidation for Clays." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/73403076750377805242.
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Silawat, Jeeravipoolvarn. "Geotechnical Behavior of In-Line Thickened Oil Sands Tailings." Phd thesis, 2010. http://hdl.handle.net/10048/1138.
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This research is an experimental, field and numerical study of the sedimentation and consolidation of in-line thickened oil sands fine tailings. In-line thickening is a process that adds flocculant and coagulant into a modified tailings pipeline in a multi stage fashion to improve the dewatering behaviour of oil sands fine tailings cyclone overflow.
The parent untreated cyclone overflow, in-line thickened tailings and sheared in-line thickened tailings were investigated in the laboratory. In-line thickened tailings were produced in the laboratory using the same process as in the field project and sheared in-line thickened tailings were prepared by shearing the thickened tailings with a specified shearing effort to simulate tailings transportation. A combination of hindered sedimentation tests, compressibility standpipe tests and large strain consolidation tests with vane shear tests was then used to capture a full range of sedimentation, consolidation and shear strength characteristics for these materials. Results show that the in-line thickening process significantly improves hydraulic conductivity and undrained shear strength of the fine tails. Shearing damages some of the floc structure but does not cause the material to fully return to the original state of the cyclone overflow.
The laboratory data of the in-line thickened tailings was compared with field performance at two in-line thickened tailings pilot scale ponds and with a validation standpipe test by utilizing a developed finite strain consolidation model. Good agreements were obtained between the field performance, the laboratory test results and the validation standpipe test. These good agreements confirmed the validity of the laboratory determined geotechnical parameters and of the developed numerical model and indicated that it is possible to model large scale field performance with small scale laboratory tests.
Finally, composite tailings was made from the in-line thickened tailings and was found to have a similar segregation boundary to that of gypsum treated composite tailings made with mature fine tailings but had a much higher hydraulic conductivity and shear strength which were inherited from the flocculated fines.Geotechnical Engineering
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Lin, You-Sheng, and 林友勝. "Dynamic Deformation Behavior of Saturated Compacted Soils Under Anisotropic Consolidation." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/x94xff.
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碩士國立中央大學
土木工程研究所
97
The cyclic strength of compacted soil is very different from ordinary sandy soil. In order to study the dynamic strength of compacted soil, this paper performed a series of dynamic triaxial tests on three kinds of compacted soils, SM, ML and CL for constructing an earth dam. This paper proposed a vacuum method for improving the saturation of compacted soils. Test results showed that both methods make the Skempton’s coefficient B of all specimens greater than 0.95. Compacted soils of the earth dam have different initial shear stress conditions which range from Kc=1.5 to Kc=2.0. Based on the test results, the higher initial shear stress ratio, the larger the dynamic strength and the less the pore water pressure. Dynamic strength of compacted soil is stronger than ordinary medium dense sand. Compacted soils have no liquefaction potential due to their shear dilation behavior and only sustain limited cyclic strain.
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Tseng, Cheng-feng, and 曾正豐. "Dynamic deformation behavior of saturated sandy soils under anisotropic consolidation." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/30907481606066695419.
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碩士國立中央大學
土木工程研究所
99
The saturated soils beneath shallow foundation are in an anisotropic consolidation state before earthquake. Their dynamic behaviors are closely related to building settlement located in a liquefaction-susceptible ground. This study performed a series of cyclic triaxial tests on isotropically and anisotropically consolidated remolded quartz sands to deduce the residual deformation characteristics. The test conditions being varied include the relative density, the confining pressure, and the anisotropic consolidation ratio Kc. The test results show that the higher the relative density and the lower the confining pressure, the smaller the deformation deduced. The larger the Kc, the more the residual deformation and the less the cyclic component. It is also found the residual deformation of soil sample loaded first with compressive force is larger than that of soil sample loaded first with tensional force. The difference of the above two residual deformations can be used to assess the differential settlement of building located in a liquefiable ground.