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Kaufmann, Stefan-Harald. "Does the parameter represent a fundamental concept of linear algebra?" Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-80339.
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In mathematics the parameter is used as a special kind of a variable. The classification of the terms \"variable\" and \"parameter\" is often done by intuition and changes due to different situations and needs. The history of mathematics shows that these two terms represent the same abstract object in mathematics. In today´s mathematics, compared to variables, the parameter is declared as an unknown
constant measure. This interpretation of parameters can be used in set theory for describing sets with an infinite number of elements. Due to this perspective the structure of vector spaces can be developed as a special structured set theory. Further, the concept of parameters can be seen as a model for developing mathematics education in linear algebra.
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Dahl, Line J. C. Haakenaasen. "Octabuoy Concept and Spar Buoys: Non Linear Effects and Analysis." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18491.
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The age of the easy accessible hydrocarbon goes towards the end and new more challenging fields is the future of the oil industry. This is often synonymous with large depths where sea bed mounted platforms are highly uneconomical options. Floating platforms are therefore commonly chosen solutions.In this thesis two types of deep foating platforms are investigated; The spar buoy, a well known, well documented concept and the Octabuoy, a newly developed concept. Both platforms are analysed in two DNV programs, Wasim and Waqum. Wasim is a non linear time domain hydrodynamic program and Waqum is an impulse response function operator with the possibility of adding non linear eects. The spar bouy concept is used as a pilot test in the softwares. A recreation of the experimental results from H.A. Haslum's doctoral thesis from 2000 is attempted. The impact of non linear effects and mooring on both platforms is discussed. The subject of viscous damping is also approached.As has previously been confirmed by many researchers, the spar buoy is susceptible to non linear eects. The triggering of the Mathieu effect is shown in the Wasim analyses. Discussion is also made as to whether the spar might also be susceptible to large excitations due to second order difference frequency interactions between surface waves and body motions. Both these effects happen at low frequencies where radiation damping is low. Viscous damping is therefore of importance. From previous research mooring is found to be important to avoid the Mathieu effect by increasing the damping and moving pitch periods out of the danger zones.After analysing the spar buoy, the Octabuoy's motion characteristics are tested in mild to severe sea states in both softwares. Non linear effects are found to be significant in the vertical rotational degrees of freedom. The heave motion however seems relatively unaffected by non linear effects. Since Wasim models the free surface linearly, what makes the pitch/roll motion affected by non linearities is found to be either non linear hydro statics or non linear Froude-Krylov forces. The Octabuoy is designed to avoid the variation on hydrostatic stiffness. However, the deadrise angle is 10 degrees larger than the ideal angle. Whether this is what leads to non linear pitch/roll motion is not known at this stage.Two softwares are used in the thesis. Wasim has very long CPU time but calculates accurately and detailed information is easily accessed with for instance the Wasim application ForceInspector. Waqum is very quick, with CPU time in the order of minutes. The program requires an experienced user who knows what must be included for a complete analysis. There are uncertainties about the results from Waqum analysis and more verication is needed for the author to feel confident about the software.To conclude, the programs might work well together. Much can be tested quickly in Waqum, and then final configurations can be run more thoroughly in Wasim. It is the experience of the author that at least until the new version of HydroD is finished, running time domain analysis in Wasim should be done through scripting. This gives a larger control over the actual input and might decrease the chance for error.Keywords: Octabuoy, Spar Buoy, Non Linear Effects, Mooring, Wasim, Waqum.
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Slye, Jeffrey. "UNDERGRADUATE MATHEMATICS STUDENTS’ CONNECTIONS BETWEEN THEIR GROUP HOMOMORPHISM AND LINEAR TRANSFORMATION CONCEPT IMAGES." UKnowledge, 2019. https://uknowledge.uky.edu/math_etds/65.
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It is well documented that undergraduate students struggle with the more formal and abstract concepts of vector space theory in a first course on linear algebra. Some of these students continue on to classes in abstract algebra, where they learn about algebraic structures such as groups. It is clear to the seasoned mathematician that vector spaces are in fact groups, and so linear transformations are group homomorphisms with extra restrictions. This study explores the question of whether or not students see this connection as well. In addition, I probe the ways in which students’ stated understandings are the same or different across contexts, and how these differences may help or hinder connection making across domains. Students’ understandings are also briefly compared to those of mathematics professors in order to highlight similarities and discrepancies between reality and idealistic expectations.
The data for this study primarily comes from clinical interviews with ten undergraduates and three professors. The clinical interviews contained multiple card sorts in which students expressed the connections they saw within and across the domains of linear algebra and abstract algebra, with an emphasis specifically on linear transformations and group homomorphisms. Qualitative data was analyzed using abductive reasoning through multiple rounds of coding and generating themes.
Overall, I found that students ranged from having very few connections, to beginning to form connections once placed in the interview setting, to already having a well-integrated morphism schema across domains. A considerable portion of this paper explores the many and varied ways in which students succeeded and failed in making mathematically correct connections, using the language of research on analogical reasoning to frame the discussion. Of particular interest were the ways in which isomorphisms did or did not play a role in understanding both morphisms, how students did not regularly connect the concepts of matrices and linear transformations, and how vector spaces were not fully aligned with groups as algebraic structures.
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Blaze, Gina. "STIRLING CONVERTOR CONTROL FOR A LUNAR CONCEPT ROVER." Cleveland State University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=csu1199806294.
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Fontenele, Francisca ClÃudia Fernandes. "Fedathi sequence in teaching of linear algebra: the case of the concept of base of a vector space." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=11351.
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FundaÃÃo Cearense de Apoio ao Desenvolvimento Cientifico e TecnolÃgicoThis research examined the teaching of concept of base of a vector space according to the premises mediated by Fedathi Sequence during the discipline âIntroduction to Algebraâ in the course of Engineering of Teleinformatic at Federal University of CearÃ. The objective was to determine whether the use of Fedathi Sequence specifically in classes about the concept of base provides resources capable of becoming Meta Lever, allowing students an education based on the reflection on the worked contents. In this sense, the investigation was conducted in the form of case study, having as subject the teacher of discipline, which allowed the observation during his classes and planning, as well as having granted an interview. The results indicated that the Fedathi Sequence favored the use of resources that could become Meta Lever for students, being decisive in mediating the teacher, once the teacher behavior to use it in the classroom motivates students to reflection. We consider theories ML and FS, in this research, are complementary, and therefore we indicate that the teacher know such tools and their potential for use in teaching of concept of base, awakening the teacher an awareness of the role of mediation suggested by Fedathi Sequence.
Esta pesquisa analisou o ensino da noÃÃo de base de um espaÃo vetorial mediado segundo os pressupostos da SequÃncia Fedathi durante a disciplina de IntroduÃÃo à Ãlgebra do curso de Engenharia de TeleinformÃtica da Universidade Federal do CearÃ. Objetivou-se verificar se o uso da SequÃncia Fedathi, especificamente, nas aulas sobre o conceito de base, proporciona recursos passÃveis de se tornarem Alavanca Meta, permitindo aos alunos um ensino baseado na reflexÃo sobre os conteÃdos trabalhados. Nesse sentido, a investigaÃÃo foi conduzida na forma de estudo de caso, tendo como sujeito o professor da disciplina, que permitiu a observaÃÃo durante suas aulas e planejamentos, alÃm de ter concedido uma entrevista. Os resultados encontrados apontaram que a SequÃncia Fedathi favoreceu o uso de recursos passÃveis de se tornarem Alavancas Meta para os alunos, sendo determinante na mediaÃÃo do professor, de modo que a postura docente ao utilizÃ-la em sala de aula motivava os alunos à reflexÃo. Consideramos que as teorias AM e SF, nessa pesquisa, se complementaram, e, portanto, indicamos que o professor conheÃa tais ferramentas e seu potencial de uso no ensino de base, despertando no professor uma consciÃncia do papel da mediaÃÃo preconizada pela SequÃncia Fedathi.
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Larsson, Petter, and Gustaf Rudbeck. "Wave Energy Concept Benchmarking." Thesis, KTH, Maskinkonstruktion (Inst.), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-298841.
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Denna rapport ämnar undersöka de vanligast förekommande typerna av teknologier för vågkraftverk (eng. Wave Energy Converter, WEC) teknologier för att jämföra de olika konceptens förmåga att absorbera vågenergi. Koncept som undersöks är punktabsorbatorer och oscillerande vattenkolumner. I denna rapport används de vanligt använda engelska översättningarna point absorber och oscillating water column (OWC). Beräkningar görs för de olika koncepten i liknande vågförhållanden för att kunna jämföra den energi som kan utvinnas. I rapporten sker beräkningar under optimala vågförhållanden. Vågorna antas vara linjära och vågkraftverken antas vara i fas med vågens svängningsrörelse. Den vågdata som använts är uppmätt utanför Belmullet i Irland. Beräkningar görs på vågor med en signifikant våghöjd på 1,25 m och en periodtid på 7,5 s. Det görs även beräkningar på den största uppmätta förekommande vågen. I huvudsak används effektberäkningar enligt en modell som Kjell Budal. Syftet är att grafiskt och numeriskt jämföra den teoretiska och faktiska maxeffekt som kan utvinnas ur respektive våg. Resultatet från undersökningen visar att den största bidragande faktorn till en hög energiutvinning beror på bojens volym. Volymen måste anpassas för de vågförhållanden som finns där bojen ska placeras.Vid beräkningar av en OWC med tvärsnittsarea på 19 m2 visar det sig att den effekt som kan utvinnas av en luftkammare med tillhörande turbin är ungefär 10 kW, 1/30 av de 300kW som kan utvinnas av en point absorber. En OWC består dock sällan utav en ensam luftkammare utan ofta i en array med ett flertal luftkammare med separata turbiner för att öka effekten.This report intends to examine the most common types of wave energy converter technologies to compare the different concepts' ability to absorb wave energy. Concepts being investigated are point absorbers and oscillating water columns (OWC). Calculations are made for the different concepts in the same wave conditions to be able to compare the energy that can be extracted. In the report, calculations are made under optimal wave conditions. The waves are assumed to be linear and the wave energy converter is assumed to be in phase with the oscillating motion of the wave. The wave data used is measured outside Belmullet in Ireland. Calculations are made on waves with a significant wave height of 1.25 m and a period time of 7.5 s. Calculations are also made on the largest measured wave present. In essence, power calculations are used according to a model developed by Kjell Budal and with the help of this be able to graphically and numerically compare the theoretical and actual maximum power that can be extracted from each scale. The results from the survey show that the largest contributing factor to high energy recovery is due to the volume of the buoy. The volume must be adapted to the wave conditions that exist where the buoy is to be placed.When calculating an OWC with a cross sectional area of 19 m2, it turns out that the power that can be extracted from an air chamber with an associated turbine is approximately 10 kW, 1/30 of the 300 kW that can be extracted by one point absorber. However, an OWC rarely consists of a single air chamber but often in a construction with several air chambers with separate turbines to increase the power.
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Bergström, Patrik. "A Proof-of-Concept Implementation of a Non-linear Video Player for HTTP-based Adaptive Streaming." Thesis, Linköpings universitet, Databas och informationsteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-95446.
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Konsumtionen av video på Internet har ökat det senaste decenniet och trenden är förväntad att fortsätta stiga. Strömmande video är en ofta använd lösning för att se video på Internet. Tekniken tillåter användaren att se film medan den laddas ned. Adaptive streaming är en teknik som låter videospelaren ändra bit-raten på videon baserat på användarens tillgängliga bandbredd. En annan lösning för att göra användarens upplevelse mer skräddarsydd är ickelinjära videor. Den här typen av videor kan spelas ur sekvens. Som exempel kan en tittare välja slutet i en film eller välja vägen genom en utställning. Examensarbetet presenterar designen och implementeringen av en ny struktur för ickelinjär video. Denna struktur används av videospelaren för nedladdning och visning av adaptiv video avsedd för ickelinjära filmer, som sparas på en server. Mediaskapare kommer också att ha lättare att både visualisera och skapa filmer på ett enhetligt sätt. Det här examensarbetet presenterar i detalj de modifikationer på Adobes Open Source Media Framework och Strobe Media Playback som tillåter spelning av ickelinjära videor. Ändringarna innefattar ett användargränssnitt för ickelinjär media. Back-end implementeringarna innefattar bufferthantering för parallell nedladdning och tekniker för att hantera den nya strukturen. Slutligen presenterar det här examensarbetet proof-of-concept-tester för att styrka funktionaliteten av designen och implementeringen. Rapporten avslutas med en diskussion om framtida arbete inom fältet.Video consumption on the Internet has been growing over the last decade and is expected to continue to increase. Video streaming is a widely used approach to viewing video on the Internet, which allows users to watch the video while it is being downloaded. Adaptive streaming is a video streaming technique that allows the player to change the downloading video’s bit rate depending on the user’s available bandwidth. Another approach to a more personal viewing experience is non-linear videos. These videos can be played in a non-sequential order. For example, a viewer can be given the choice of what ending to watch in a movie, or the path through an exhibition. This thesis will present the design and implementation of a novel structure for non-linear video. This structure is used by a video player for downloading and viewing an adaptive video intended for non-linear viewing, stored at some server. Media creators will also have an easier time to both visualize and create uniform video experiences. This thesis presents modifications to Adobe’s Open Source Media Framework and Strobe Media Playback which allow playing non-linear video. Presented in this thesis are the design and implementation details. Changes in the player include a user interface for non-linear media. The changes to the back-end include buffer management for parallel downloading and techniques to handle the new structure. Finally, this thesis presents proof-of-concept validation tests that show the functionality of the design and implementation. The thesis is concluded with a discussion of future work in this area.
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Chyuan, Jong-pyng Michael. "A concept learning and teaching approach to the instruction of linear motion in introductory college physics /." The Ohio State University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487687959968003.
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Hardie, Harold Robert (Bob). "The documentary mind: In the subject of a practitioner’s perspective on changes in documentary concept and production." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2016. https://ro.ecu.edu.au/theses/1924.
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This autoethnographic study examines the influences of recent digital technology upon the practice and philosophy of documentary filmmaking. To assess the impact of new digital methodology on the film production process, The Musicians, a wholly-digital, 55-minute documentary film, was produced as an example. This music-based subject was chosen to specifically demonstrate the potential advantages of lightweight digital equipment and its extended recording capacity in orchestral documentation. The capability of non-linear digital editing to process large amounts of imagery, together with its ability to manage multiple image and audio streams concurrently, was also examined. This exegesis also reviews the impact of recently-emerged digital multimedia and multi-platform formats on perceptions of the more standard linear documentary format, all of which have been incorporated into a single documentary category by some researchers. For a traditional documentary such as The Musicians to be categorised with open-ended, multimedia constructions seems somewhat anomalous.
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Pettersson, Annika. "Grafisk och algebraisk representation : Gymnasieelevers förståelse av linjära funktioner." Licentiate thesis, Karlstads universitet, Institutionen för matematik och datavetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-41777.
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This thesis concerns upper secondary students’ understanding of algebraic and graphic representation of linear functions. Components of the students’ concept images, so-called ‘concept elements’, were studied as a way to capture their understanding. Four aspects affect the graphical view of a linear function, namely the parameter k, the parameter m, the scale of the coordinate axes and the domain of the function. Concerning the scale of the coordinate axis, there is a need to distinguish between two kinds of slope. When the scale of x-axis is changed, the k-value of the function, the so-called analytic slope, is constant but the visual slope changes. The tasks were designed so that three aspects were held constant in each task and one was varied. The study is qualitative and consists of two sub- studies. In the first, six students worked with two tasks involving the parameters k and m in the dynamic software GeoGebra. In the second, eight students were interviewed about a task concerning functions with different domains. Both studies also involved a task concerning the aspect of slope in a non-homogeneous coordinate system (a system with different scales on the axes). The results indicate three main findings: Firstly, students displayed difficulties in distinguishing between analytic and visual slope. Secondly, the word ‘start value’ can lead to conceptual problems when there is no visible intercept between the graphical representation of the function and the y-axis. Thirdly, the students displayed almost no concept elements in relation to the domain of a function.Denna licentiatuppsats behandlar gymnasieelevers förståelse av linjära funktioners algebraiska och grafiska representation. Delar av elevers begreppsbilder, kallade begreppselement, har studerats som en metod att fånga deras förståelse. Fyra aspekter påverkar den grafiska representationen av en linjär funktionens algebraiska representation . Dessa aspekter är: parametern k, parametern m, skalan på koordinatsystemets axlar och funktionens definitionsmängd. Studien är kvalitativ och består av två delstudier. I första delen arbetade tre par elever med uppgifter som rör parametrarna k och m. I andra delen intervjuades åtta elever om uppgifter som behandlar linjära funktioner med olika definitionsmängder. Båda delstudierna innehöll en uppgift som berör aspekten lutning i ett inhomogent koordinatsystem (ett system med olika skalor på axlarna). När skalan på x-axeln förändras är funktionens k-värde, så kallad analytisk lutning, konstant medan den visuella lutningen förändras. Studiens viktigaste resultat: 1) Elever visar svårigheter att särskilja analytisk och visuell lutning. 2) Ordet startvärde kan leda till konceptuella problem när synlig skärningspunkt på y-axeln saknas. 3) Eleverna visade i stort sett inte några begreppselement i relation till definitionsmängd.
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Hong, Sang-Ki. "Development and proof-of-concept of an interactive visualization system for the spatiotemporal analysis of linear point data /." The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487944660933062.
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Porumamilla, Hemanth. "Modeling, analysis and non-linear control of a novel pneumatic semi-active vibration isolator a concept validation study /." [Ames, Iowa : Iowa State University], 2007.
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Chretien, Benoît. "Simulation of a new automotive concept based on a centralized approach for driver assistance system activation decision." Thesis, Evry-Val d'Essonne, 2012. http://www.theses.fr/2011EVRY0033.
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De nos jours, afin d'améliorer la sécurité routière, de plus en plus de systèmes d'assistance à la conduite, appelé ADAS (Advanced Driver Assistance System) sont embarqués dans les véhicules. Leur augmentation rend le développement des véhicules toujours plus complexes. Pour parer à ces difficultés, dans un premier temps, ma thèse propose l'élaboration d'un simulateur de véhicule, capable d'aider le développeur. Afin de résoudre les problèmes de décisions et de synchronisation, l'état de l'art a été considéré pour choisir une architecture adaptée aux ADAS. En dernier lieu, un algorithme de prise de décision a été développé, pour optimiser l'intégrité du véhicule. Pour modéliser le véhicule, un simulateur émule le comportement planaire de celui-ci et des actionneurs qui agissent sur sa dynamique, tels que le moteur ou les freins. Une fois la base du véhicule réalisée, j'ai concentré mon travail sur les ADAS. Comme actuellement aucune solution concrète n’existe pour la stratégie de décision, afin de choisir l’aide la plus adaptée à la situation, le dernier point traité dans ma thèse a été le développement d'une décision assurant l'intégrité du véhicule. Celle-ci couple un calcul de trajectoire avec un ensemble invariant de Lyapunov, obtenu par un problème d'optimisation avec contraintes sous forme de d'inégalités matricielles bilinéaires. Elle permet d’évaluer l'activation des fonctions et de fournir un avertissement au conducteur dans les situations critiques. Pour illustrer le fonctionnement de cette décision, un exemple de contrôle longitudinal a été choisi, comprenant un régulateur automatique de vitesse et un freinage d'urgenceNowadays, to enhance traffic safety, more and more Advance Driver Assistance Systems (ADAS) are embedded in mass-production vehicles. Their increase renders development of vehicles more and more complex, especially to design Electronic and Electric (E/E) architecture, to synchronize the different embedded ADAS and decide which ADAS should be engaged. To cope with E/E architecture issues, my PhD thesis proposes a vehicle simulator, which is able to support architect designers. Then, to solve synchronization and decision problems, ADAS architecture has been chosen, according to the state of the art. Finally, a decision algorithm has been developed to optimise vehicle safety. To model the vehicle, a simulator emulates its plane motion according to embedded actuators acting on dynamic, like engine and brakes. Once the vehicle basis has been performed, I focus my work on ADAS. Because nowadays no generic solution exists to decide which ADAS to engage, last focus of my PhD has been the design of a decision method, optimizing vehicle safety. This latter couples a path-planning witch a Lyapunov invariant set, obtained through optimization problem constraints by bilinear matrix inequality. This strategy enables to assess embedded ADAS-functions and to warn the driver in critical situations. In order to illustrate this former, it has been illustrated with 2 longitudinal functions, a Adaptive Cruise Control and an Emergency Brake
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Uzoukwu, E. Emeka. "Le Secteur pétrochimique dans le concept de développement global du Nigéria : les branches d'applications : polypropylene - linear alkyle benzene - carbon black." Paris, EHESS, 1990. http://www.theses.fr/1990EHES0018.
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L'industrie petrochimique nigerianne que nous avons propose d'analyser presente un certain nombre de specificites, lesquelles ont justement motive notre recherche. La saisie de la principale de ces specificites a ete effectuee en analysant l'existence d'un secteur petrochimique dans le cadre du developpement d'un secteur petrochimique dans le cadre du developpement d'ensemble du nigeria a travers la theorie des "industries motrices". Mais on montre en meme temps que l'analyse de developpement historique du nigeria fait apparaitre les limites des conditions de pertinence de cette theorie. - dans le cadre de l'industrie petrochimique elle-meme, le con- cept central du "calcul des effets d'entrainements" s'applique loique- ment. - dans le cadre du developpement global, la theorie des "industries motrices" rencontre beaucoup de reserves quant a son appli- cation en tant que methodologie, dans la mesure meme ou l'autre concept principal de cette theorie. Celui de la "triangulation", n'a pas son correspondant objectif dans la strategie des pouvoirs publics nigerians. Certes, le nigeria n'a pas suivi cette voie; mais pas seu- lement parce qu'il n'avait pas de societe civile moderne, mais aussi parce que la classe politique n'etait pas soudee et parce qu'elle n'etait pas predisposee a rompre avec les flux classiques des relations internationalesThe petrochemical instrutory of nigeria that we propose to analyse poresents certain number of specificitises which indeed motivated our research. The apprehension of these principal specificities were observed by analysing the existence of a section of petrochemical industry in the context of general development of nigeria through the theory of "inductible industries" (industrie motrices). But at the same time our studies reveals through its analysis that the historical development of nigeria presents limits of pertinents condition of this theory. Withen petrochemical industry itself, the major concept of calculation * of linkage and induction effect show corresponding application. * on the level of general development of nigeria, the concept of "inductibility" or "linkage" industires meet lots of handicorp in its methodological application, in the sense that the other other concept of the theory : that of "triangulation" does not have its objective correspondance in the strategic planing, by nigerian decision makers. Thus nigeria did not opte for this concept as to it's development, not for the fact that it does not have a modern administrative society, nor was it for the fact it's decision. .
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FONTENELE, Francisca Cláudia Fernandes. "A sequência fedathi no ensino da álgebra linear: o caso da noção de base de um espaço vetorial." www.teses.ufc.br, 2013. http://www.repositorio.ufc.br/handle/riufc/7521.
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FONTENELE, Francisca Cláudia Fernandes. A sequência fedathi no ensino da álgebra linear: o caso da noção de base de um espaço vetorial. 2013. 94f. – Dissertação (Mestrado) – Universidade Federal do Ceará, Programa de Pós-graduação em Educação Brasileira, Fortaleza (CE), 2013.Submitted by Márcia Araújo (marcia_m_bezerra@yahoo.com.br) on 2014-02-27T12:29:38Z No. of bitstreams: 1 2013-DIS-FCFFONTENELE.pdf: 1685200 bytes, checksum: 501a01826fc849e7804e2c26150de5e8 (MD5)
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This research examined the teaching of concept of base of a vector space according to the premises mediated by Fedathi Sequence during the discipline “Introduction to Algebra” in the course of Engineering of Teleinformatic at Federal University of Ceará. The objective was to determine whether the use of Fedathi Sequence specifically in classes about the concept of base provides resources capable of becoming Meta Lever, allowing students an education based on the reflection on the worked contents. In this sense, the investigation was conducted in the form of case study, having as subject the teacher of discipline, which allowed the observation during his classes and planning, as well as having granted an interview. The results indicated that the Fedathi Sequence favored the use of resources that could become Meta Lever for students, being decisive in mediating the teacher, once the teacher behavior to use it in the classroom motivates students to reflection. We consider theories ML and FS, in this research, are complementary, and therefore we indicate that the teacher know such tools and their potential for use in teaching of concept of base, awakening the teacher an awareness of the role of mediation suggested by Fedathi Sequence.
Esta pesquisa analisou o ensino da noção de base de um espaço vetorial mediado segundo os pressupostos da Sequência Fedathi durante a disciplina de Introdução à Álgebra do curso de Engenharia de Teleinformática da Universidade Federal do Ceará. Objetivou-se verificar se o uso da Sequência Fedathi, especificamente, nas aulas sobre o conceito de base, proporciona recursos passíveis de se tornarem Alavanca Meta, permitindo aos alunos um ensino baseado na reflexão sobre os conteúdos trabalhados. Nesse sentido, a investigação foi conduzida na forma de estudo de caso, tendo como sujeito o professor da disciplina, que permitiu a observação durante suas aulas e planejamentos, além de ter concedido uma entrevista. Os resultados encontrados apontaram que a Sequência Fedathi favoreceu o uso de recursos passíveis de se tornarem Alavancas Meta para os alunos, sendo determinante na mediação do professor, de modo que a postura docente ao utilizá-la em sala de aula motivava os alunos à reflexão. Consideramos que as teorias AM e SF, nessa pesquisa, se complementaram, e, portanto, indicamos que o professor conheça tais ferramentas e seu potencial de uso no ensino de base, despertando no professor uma consciência do papel da mediação preconizada pela Sequência Fedathi.
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Finocchiaro, Thomas [Verfasser]. "Untersuchung eines Linearantriebkonzeptes für ein vollständig implantierbares Kunstherz : Investigation of a linear drive concept for a fully implantable total artificial heart / Thomas Finocchiaro." Aachen : Shaker, 2013. http://d-nb.info/1051575524/34.
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Ventani, Alessia. "Generare con transformer lineare spiegazioni di concept set medicali costituiti da termini correlati estratti da social post di pazienti." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23059/.
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Le malattie rare pongono diversi scogli ai pazienti, ai loro familiari e ai sanitari. Uno fra questi è la mancanza di informazione che deriva dall'assenza di fonti sicure e semplici da consultare su aspetti dell'esperienza del paziente. Il lavoro presentato ha lo scopo di generare da set termini correlati semanticamente, delle frasi che abbiamo la capacità di spiegare il legame fra di essi e aggiungere informazioni utili e veritiere in un linguaggio semplice e comprensibile. Il problema affrontato oggigiorno non è ben documentato in letteratura e rappresenta una sfida interessante si per complessità che per mancanza di dataset per l'addestramento. Questo tipo di task, come altri di NLP, è affrontabile solo con modelli sempre più potenti ma che richiedono risorse sempre più elevate. Per questo motivo, è stato utilizzato il meccanismo di recente pubblicazione del Performer, dimostrando di riuscire a mantenere uno stesso grado di accuratezza e di qualità delle frasi prodotte, con una parallela riduzione delle risorse utilizzate. Ciò apre la strada all'utilizzo delle reti neurali più recenti anche senza avere i centri di calcolo delle multinazionali.
Il modello proposto dunque è in grado di generare frasi che illustrano le relazioni semantiche di termini estratti da un mole di documenti testuali, permettendo di generare dei riassunti dell'informazione e della conoscenza estratta da essi e renderla facilmente accessibile e comprensibile al pazienti o a persone non esperte.
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Donevska-Todorova, Ana. "Utilizing Technology to Facilitate the Transition from Secondary- to Tertiary Level Linear Algebra." Doctoral thesis, Humboldt-Universität zu Berlin, 2017. http://dx.doi.org/10.18452/18561.
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Es ist eine weit verbreitete Wahrnehmung, dass der Übergang zwischen der Mathematik der gymnasialen Oberstufe und der Mathematik an der Universität für Studierende problematisch sein kann. Besondere Verständnisschwierigkeiten in Bereich der lineare Algebra (lA) bereiten den Studierenden die verschiedenen Herangehensweisen auf diesen beiden Ebenen. Dies lässt sich auf die strukturell-axiomatischer Herangehensweisen an die lA an der Universität, im Gegensatz zu ihrer arithmetisch-geometrischen Darstellung in der Schule, zurückführen. Dies bedingt ebenfalls Unterschiede im prozeduralen und konzeptuellen Verständnis. Ziel dieser Arbeit ist es, zu untersuchen, wie Schüler konzeptuelles Verständnis, Bezug nehmend auf die Theorien von concept definition/image in Verbindung mit multiplen Modi der Beschreibung und des Denkens von Konzepten wie Bilinearität z.B. Skalarprodukt und Multilinearität z.B. Determinanten gewinnen können. Um dies zu erreichen wurde eine substanzielle Lehr-Lernumgebung unter Verwendung einer dynamischen Geometriesoftware (DGS) entwickelt. Die Lerneinheit wurde an einem Berliner Gymnasium eingesetzt und dabei ein vollständiger design-based research Zyklus durchlaufen und eine multiple-level Datenanalyse durchgeführt. Die Ergebnisse der Untersuchung zeigen nicht nur, dass eine Erweiterung der Vorstellungen der Schüler, eine Entwicklung multipler Denkmodi und ein Gewinn tieferen konzeptuellen Verständnisses in der lA erfolgreich vermittelt werden können, sondern geben auch Einblicke in ein mögliches theoretisches Modell, mit dessen Hilfe sich diese Prozesse weiter untersuchen lassen. Weiterhin werden die interaktiven Lehr-Lernmaterialien für die weitere Verwendung im Rahmen von Lehre und Forschung zur Verfügung gestellt. Es öffnen sich neue Forschungsfragen hinsichtlich lokalen Axiomatisierens in der lA der gymnasialen Oberstufe, welches auf einer Integration geometrischer, algebraischer und axiomatischer Denkmodi, unterstützt durch DGS, basieren könnte.A common perception among researchers in mathematics education is that the transition between secondary- and tertiary level of mathematics may be problematic for the students. In particular, the exact and abstract nature of the theory of Linear algebra versus its arithmetic-geometric presentation in school appears to be difficult for the novice students. The application of properties for defining concepts at university in contrast to their usage for describing concepts in school points out a possible occurrence of obstacles for learning and discrepancies in procedural and conceptual understanding. The aim of this study is to examine how could upper-high school students develop a conceptual understanding based on concept definition and concept image in connection to multiple modes of description and thinking about concepts such as bi-linearity exemplified by the dot product of vectors and multi-linearity exemplified by determinants. In order to achieve this, I have created a specific teaching/ learning sequence in a dynamic geometry environment (DGE), then implemented it and evaluated it in a high school in Berlin, following a complete cycle of design-based research and conducting a multiple-level data analysis. The findings of the study show not only that widening students' concept images, developing multiple modes of thinking and gaining deeper conceptual understanding can successfully be mediated by dynamic geometries, but also give insights into an eventual theoretical model of how can they be further examined. Moreover, the study promotes authorized open-source interactive teaching/ learning materials for further sustainable practice and research. It opens new research questions about revisiting axiomatic approaches on local levels in upper high-school Linear algebra which may base on the integration of all three modes of description and thinking geometric, algebraic and abstract possibly facilitated by DGE.
Честа перцепција кај многумина истражувачи во областа на математичкото образование е дека транзицијата помеѓу средното и високото образование по математика може да биде проблематична за студентите. Егзакноста и апстрактноста на теоријата по Линеарна алгебра наспроти нејзината аритметичко-геометриска презентација во средното гимназиско образование се покажува како особено тешка за студентите. Примена на својствата на математичките поими за нивно дефинирање на универзитетско ниво наспроти нивното употреба за опишување на претходно дефинирани поими на училишно ниво, укажува на можна појава на тешкотии при нивното изучување и несовпаѓање на процедуралното и концептуалното разбирање на истите. Целта на оваа студија е да истражи како средношколците би можеле да развијат концептуално разбирање на поимите врз основа на концепт дефиниција и концепт слика во врска со мулти-моди на мислење, конкретно за поими како билинеарност, пр. скаларен производ на вектори, и мултилинеарност, пр. детерминанти. За да ја постигнам оваа цел, креирав наставна содржина поддржана од еден динамичен геометриски систем (ДГС) и следејќи целосен циклус на т.н. design-based research и спрoведувајќи мулти-анализа на податоци, истата ја имплементирав и евалуирав во едно средно училиште во Берлин. Резултатите од студијата укажуваат не само на фактот дека проширувањето на концепт сликите на учениците, развојот на мулти-моди на мислење и стекнувањето на длабоко концептуално разбирање на поимите можат да бидат успешно посредувани од ДГС туку овозможија и увид во еден теоретски модел за тоа коко тие можат понатаму да се истражуваат. Уште повеќе, студијата промовира авторизирани open-source интерактивни материјали за предавање и учење на содржините кои може да служат за понатамошни одржливи истражувања и развој. Студијата отвора нови истражувачки прашања за средношколската Линеарна алгебра која може да се базира на интеграција на сите три моди на мислење, геометриски, алгебарски и апстрактен, поддржан од ДГС.
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Andary, Sébastien. "Contributions à la commande des systèmes mécaniques sous-actionnés : du concept à l'implémentation temps réel." Thesis, Montpellier 2, 2014. http://www.theses.fr/2014MON20110/document.
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Cette thèse porte sur la commande non linéaire des systèmes mécaniques sous-actionnés, ces systèmes possédant moins d'actionneur que de degrés de liberté. La dynamique interne de ces systèmes est souvent instable ce qui les rend difficiles à commander et requiert des méthodes de commande spécifiques. La contribution de cette thèse est la proposition de deux approches de commandes originales dont le but est la génération de cycle limites stables sur toutes les coordonnées du système mécanique sous-actionné. La première approche de commande est basée sur la linéarisation partielle par retour d'état et l'optimisation de trajectoires de référence. La seconde approche est basée sur les travaux récents sur la commande sans modèle, une technique de commande qui permet de contrôler un système sans avoir besoin de modèle mathématique préalable de sa dynamique. Ces deux approches de commande sont appliquées à un système mécanique sous-actionné particulier: le pendule inversé stabilisé par roue d'inertie. Plusieurs scénarios sont proposés, à la fois en simulation numérique et en temps-réel sur une plate-forme expérimentale. Les résultats obtenus attestent de la capacité des contrôleurs proposés à stabiliser le système autour de cycles limites stables en dépit de la présence de perturbations externesThis thesis is focused on non linear control of underactuated mechanical systems, thoses systems with less actuators than degrees of freedom. The internal dynamics of such system is often unstable making them particulary difficult to control. Thus specific care must be taken when designing controlers for such systems. The main contribution of this thesis is the design of two new control schemes for stable limit cycles generation on all coordinates of underactuated mechanical systems. First control approach is based on partial feedback linearization and reference trajectories optimization. Second approach is based on recent work on model free control,a control scheme which doesn't require prior mathematicalmodel of the controlled system dynamics. The proposed approaches are applied to an inertiawheel inverted pendulumtestbed. Several experimental scenarios are proposed, both in numerical simulation and in realtime implementation. Obtained results demonstrate the ability of both controllers to stabilize the system around stable limit cycles and to reject external disturbances
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Ilgin, Gökay [Verfasser], Bernd [Akademischer Betreuer] Noche, and Thomas [Akademischer Betreuer] Steinhäuser. "Concept Development to Control Non-value Added Logistical Costs in a Primary Aluminium Casthouse by Interfacing Linear Optimization and Simulation / Gökay Ilgin. Gutachter: Thomas Steinhäuser. Betreuer: Bernd Noche." Duisburg, 2013. http://d-nb.info/1042373582/34.
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Li, Xiang [Verfasser], Heinz [Akademischer Betreuer] Konietzky, Heinz [Gutachter] Konietzky, Wulf [Gutachter] Schubert, and Guijun [Gutachter] Wang. "Lifetime prediction for rocks : a numerical concept based on linear elastic fracture mechanics, subcritical crack growth, and elasto-plastic stress redistributions / Xiang Li ; Gutachter: Heinz Konietzky, Wulf Schubert, Guijun Wang ; Betreuer: Heinz Konietzky." Freiberg : Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2013. http://d-nb.info/1220698814/34.
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Sproule, Olive Elizabeth. "The development of concepts of linear and quadratic equations." Thesis, Queen's University Belfast, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314224.
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Lachenal, Xavier. "Concepts for morphing composite structures using non-linear stiffness tailoring." Thesis, University of Bristol, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.601215.
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Recently, morphing structures have found increased interest due to their potential for combining conflicting requirements of strength, flexibility and low mass. Many concepts depend on continuously powered actuators to deform the structure. Others possess multiple stable states, i.e. multi-stability and power is only needed to change the shape, not to hold it. This dissertation explores the design space of a helical morphing, composite, twisting structure capable of large deformations along its axis of twist with non-linear stiffness properties. Multi-stability is achieved by a combination of pre-stress, geometry of the structure and material properties. Multi-stability is fully exploited by demonstrating the capability of the helix to be bi-stable or, depending on the design parameters, to hold any twisted configuration; hence presenting the remarkable property of zero torsional stiffness. Three proof-of-concept case studies are detailed: simple helices, a wind turbine twisting tip and a bi-stable I-beam. In the first instance, the helical structure is investigated and analytically modelled. Prototypes are developed to verify the non-linear stiffness properties of the structure and experimental results are correlated against analytical and finite element model data. Three different stability characteristics are explored and detailed. Multi-stability is analysed using a simple analytical model, predicting the positions of stable and unstable states for different design parameters and material properties. Actuation using piezoelectric material is also explored in a separate analytical study. Then, the negative stiffness property of the pre-stressed structure is incorporated into a half-scale twisting wind turbine blade. Overall, the manufactured blade achieves zero stiffness in torsion for angles of twist between _5° to +5° due to the added helical structure. Finally, a common structural component, the I-beam, is redesigned to show bi-stability.
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Wang, Yanjun. "Production of γ-valerolactone from the hydrogenation of levulinic acid or alkyl levulinates : calorimetry and kinetic study Application of the concept of Linear Free Energy Relationships to the hydrogenation of levulinic acid and its corresponding esters Thermal risk assessment of levulinic acid hydrogenation to γ-valerolactone." Thesis, Normandie, 2020. http://www.theses.fr/2020NORMIR02.
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Les énergies fossiles jouent un rôle fondamental dans l'économie, la société et la politique. Il existe différentes énergies renouvelables pouvant présenter une alternative telles le solaire, l'éolien, l'hydro-électrique ou encore la biomasse. Parmi ces énergies renouvelables, la biomasse est la seule source de carbone pouvant être utilisée pour la production de carburants, produits chimiques ou matériaux. Parmi les produits chimiques issus de la biomasse, la production de molécules plateformes comme l'acide lévulinique (AL) et ses esters est une voie attractive. Ces molécules peuvent être obtenues par solvolyse de la cellulose ou hémicellulose. L’hydrogénation de ces molécules plateformes conduit à la production de γ-valerolactone (GVL) qui peut aussi être considéré comme une molécule plateforme. Pour favoriser le passage à l'échelle industrielle et trouver les conditions opératoires optimales vis-à-vis de la sécurité et des coûts de production, les questions suivantes doivent être répondues : - Quel est le risque thermique de cette réaction d' hydrogénation? ; - Quel réactif doit-on utiliser : AL ou ses esters? ; - Afin de favoriser l’intégration énergétique, comment mesurer les enthalpies de réactions? Dans un premier temps l'évaluation des risques thermiques pour l' hydrogénation de l’acide lévulinique en GVL catalysée par Ru/C dans l'eau a été effectuée. Un modèle cinétique simple incluant un bilan énergétique en condition pseudo-adiabatique a été développé pour estimer les constantes cinétiques et les paramètres de risque thermique. Par cette étude, il a été possible de déterminer des conditions opératoires sûres pour ce système afin de prévenir les emballements thermiques. Dans un deuxième temps, une approche structure-réactivité a été effectuée en utilisant le concept de relation linéaire de l’énergie libre, à savoir l’équation de Taft. Cette équation a été utilisée pour l'hydrogénation de l'acide lévulinique et de ses esters en GVL catalysée par Ru/C. Le GVL a été utilisé comme solvant pour solubiliser les différents réactifs : AL, lévulinate de méthyle (LM), d'éthyle (LE) et de n-butyle (LB). Il a été démontré que la première étape cinétique, à savoir l'hydrogénation de LA, LM, LE ou LB en leurs intermédiaires et la cinétique de la deuxième étape, à savoir la cyclisation suivent l'équation de Taft. Les effets polaires et stériques ont été évalués et il a été montré que l'effet polaire gouverne ces étapes réactionnelles. La dernière partie de cette thèse consiste à estimer les enthalpies de réaction par calorimétrie. L'estimation de ces constantes thermodynamiques peut s'avérer complexe parce que le GVL est utilisé comme solvant et qu'il n'y a pas d'informations sur les intermédiaires. L’hydrogénation du lévulinate de méthyle a été sélectionnée pour cette étude. Une méthode utilisant les données calorimétriques et analyse chimique a permis d’évaluer l'enthalpie réactionnelle globale et les enthalpies des 2 réactions consécutives. Il a été montré que l'enthalpie globale a une valeur de -51.5 kJ/mol de GVL produits montrant que le système est dans sa globalité exothermique. L’enthalpie d'hydrogénation a été estimée à -58-66 kJ/mol de LM consommé et celle de cyclisation à +7,16 kJ/mol de GVL produitsFossil energy plays a fondamental role in the economy, society and politics. Till now, different renewable energy are explored to be an alternative for energy supply, such as wind, solar, hydro and biomass energy. Among these renewable energy, biomass is regarded as the organic carbon source which can be applied for production of fuels, chemicals or materials. Among the bio-based chemicals, production of platform molecules such as levulinic acid (LA) and its esters is one of attractive way for biomass valorization. LA and its esters can be obtained through hydrolysis and alcoholysis of cellulose or hemicellulose. By further hydrogenation, γ-valerolactone (GVL) is produced and it is also regarded as a platform molecule for further upgrading to biofuels and chemicals with wide application. To scale-up the hydrogenation reaction and to find the optimum operating conditions towards safety and cost, the following questions must be answered : - What is the thermal risk of this reaction? ; - Which starting materials to choose (LA or esters)? ; - For a better energy integration of this process, how to measure the reaction enthalpies? Herein, at first, thermal risk assessment for hydrogenation of LA to GVL catalyzed by Ru/C in water was performed. A simplified kinetic model including energy balance under near-adiabatic conditions was developed to estimate the kinetic constants and thermal risk parameters of this reaction system. Through this thermal risk assessment, it was possible to know the safe operation conditions for this reaction system, i.e., preventing the risk of thermal runaway. Secondly, a structure-reactivity approach was carried out using the concept of Linear Free Energy Relationships (LFER). i.e., Taft equation. The Taft equation (LFER) was applied to hydrogenation of LA and its corresponding esters to GVL catalyzed over Ru/C. GVL was used as a solvent to allow the solubility of the different reactants, namely, LA, methyl levulinate (ML), ethyl levulinate (EL) and n-butyl levulinate (BL). It was demonstrated that the kinetics of the first step, i.e., hydrogenation of LA, ML, EL or BL to the corresponding intermediates and the kinetics of the second step, i.e., ring-closure follow Taft equation. The polar and steric effect of the substituents were evaluated, and it is shown that polar effect governs the kinetics of both reaction steps. Thirdly, the estimation of reaction enthalpies by calorimetry experiments was done. The estimation of such thermodynamic constants by using different thermodynamic models can be hazardous, because in this study GVL was used as a solvent and there are no data concerning the intermediates. Hydrogenation of methyl levulinate (ML) to GVL catalyzed over Ru/C was selected for this study. A method which links calorimetry measurement with composition analysis was developed to determine the reaction enthalpies of the overall reaction and two consecutive steps. It was found that the overall reaction enthalpy was -51.5 kJ/mol of GVL produced, which indicates that the reaction for production of GVL from ML is exothermic. The reaction enthalpy for the first hydrogenation step was calculated to be -58.66 kJ/mol of ML consumed, and for the reaction enthalpy for the second ring-closure step was calculated to be +7.16 kJ/mol of GVL produced
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Broszat, Dominik. "Aircraft engine noise footprint reduction via a non-uniform inlet liner concept." kostenfrei, 2008. http://mediatum2.ub.tum.de/node?id=654812.
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Grande, André Lúcio. "O conceito de independência e dependência linear e os registros de representação semiótica nos livros didáticos de Álgebra Linear." Pontifícia Universidade Católica de São Paulo, 2006. https://tede2.pucsp.br/handle/handle/11123.
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This research aims to investigate which semiotic representation registers are most used in Linear Algebra textbooks in the presentation and study of the topic linear independence. The mathematics textbook is a resource much used by the teachers in its work. They present many representation registers, which can to be analyzed qualitatively to assess their potential contribution to the teaching-learning process. To this end, five Linear Algebra textbooks were selected for an analysis which involved the diagnosis of the representation registers used in the definition of linear independence, as well as the examples and exercises proposed for its study. The theory used in the analysis of these textbooks was Raymond Duval´s theory of Registers of Semiotic Representation, which highlights the importance of changes between registers in the learning of mathematical objects. In each textbooks, the registers present were classified and analyzed, along with the possible transformations of registers as carried out in the resolution of the examples and considered exercises. As result, scarcity of the use of some registers of representation it was evidenced in the chapters that approach the slight knowledge of independence and linear dependence, as for example, the geometric one to determine if a set of vectors is linearly independent or not, and the register of the natural language, in the resolution of examples and considered exercises that involve demonstrations. The analysis also indicated a lack of attention to conversions between registers in the examples and proposed exercises of analyzed textbooks
Esta pesquisa tem como objetivo investigar nos livros didáticos de Álgebra Linear quais são os registros de representação semiótica mais utilizados no estudo das noções e atividades propostas sobre independência linear. O livro didático é um recurso muito utilizado pelos professores no seu trabalho, o qual apresenta muitos registros de representação que podem ser analisados qualitativamente para a contribuição no processo de ensino-aprendizagem. Para isso, foram selecionados cinco livros didáticos de Álgebra Linear que se diagnosticou os registros de representação utilizados na definição, exemplos e exercícios propostos a respeito de independência linear. A teoria utilizada na análise dos livros didáticos foi a dos Registros de Representação Semiótica de Raymond Duval, que destaca a importância da mudança de registros na aprendizagem dos objetos matemáticos. Em cada obra, os registros foram classificados e analisados, bem como as possíveis transformações de registros realizadas na resolução dos exemplos e exercícios propostos. Como resultado, constatou-se nos capítulos que abordam as noções de independência e dependência linear uma escassez da utilização de alguns registros de representação, como por exemplo, o geométrico para determinar se um conjunto de vetores é linearmente independente ou não, e o registro da língua natural, na resolução de exemplos e exercícios propostos que envolvem demonstrações. Além disso, verificou-se a falta de conversão de registros nas definições, exemplos e exercícios propostos dos livros didáticos analisados
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Kim, Jeonghoon. "Investigation of the Herschel-Quincke tube concept in a rectangular lined duct." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/46175.
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In this research an innovative combination of the Herschel-Quincke tubes and traditional liners is proposed for application in noise reduction of aircraft engines. The approach consists of installing Herschel-Quincke (HQ) tubes on lined rectangular ducts. An analytical model was developed to predict the effects of HQ tubes applied to rectangular lined ducts. The technique involves assuming the tube-duct interfaces as finite piston sources. These sources couple the acoustic field inside the duct with the acoustic field within the HQ tubes. The accuracy of the analytical model was validated with experimental data. Three different types of experimental configurations were tested: liner only, HQ tube with a hard wall duct, and HQ tubes with liners. Analytical predictions were shown to correlate well with the experimental data. Two typical types of liners, perforate and linear, were tested in these investigations. The perforate and linear liners with HQ systems showed better sound attenuations than the HQ tubes with hard walled ducts and liners only systems. The performance of the perforate and linear liners with HQ tubes were investigated in various configurations. The results indicated possible combinations which show great potential for reducing the noise within the ducts.Master of Science
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Yost, Allison L. (Allison Lynne). "Fluid-filled helmet liner concept for protection against blast-induced traumatic brain injury." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/74952.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 122-129).
Due to changes in modem warfare threats, as well as advances in body armor, soldier survivability in combat has increased, but blast-induced Traumatic Brain Injury (TBI) has become a prevalent injury in the battlefield. Often referred to as the "signature wound" of the current U.S. conflicts, blast-induced TBI is not a very well understood injury. In an effort to gain more insight on blast mechanisms and TBI, and to increase protection against this injury, our study investigates the development and exploration of a new Advanced Combat Helmet (ACH) liner for the modem day soldier. The key component of the liner explored in this work is the addition of channels within foam that contain fluid or fluid-like materials. To support this goal, this thesis explores the response of these filler materials in a 2D sandwich structure at a range of pressures believed to be in the range of the occurrence of mild TBI, the most common TBI diagnosis among soldiers. Filler materials explored in this work are glass beads and glycerin. Experiments were performed at Purdue University and the University of Nebraska at Lincoln, using two different shock tube setups to produce incident blast waves. Peak transmitted pressure was used to assess filler materials' blast mitigation abilities, and any nonlinear behavior was explored over the range of incident pressures tested. Results indicate a nonlinear effect in the mitigation of blasts by solid foam and glass beads. These materials respond linearly to applied pressures at 15, 30, and 45 psi, but digress from linear behavior at 60 psi applied pressure. It was also determined that there is a significant advantage to using sandwiches with glass beads compared to solid foam at 60 psi applied pressure, but at 15 psi, 30 psi, and 45 psi, there is no significant difference among all three materials explored.
by Allison L. Yost.
S.M.
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Malik, Zeeshan. "Towards on-line domain-independent big data learning : novel theories and applications." Thesis, University of Stirling, 2015. http://hdl.handle.net/1893/22591.
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Feature extraction is an extremely important pre-processing step to pattern recognition, and machine learning problems. This thesis highlights how one can best extract features from the data in an exhaustively online and purely adaptive manner. The solution to this problem is given for both labeled and unlabeled datasets, by presenting a number of novel on-line learning approaches. Specifically, the differential equation method for solving the generalized eigenvalue problem is used to derive a number of novel machine learning and feature extraction algorithms. The incremental eigen-solution method is used to derive a novel incremental extension of linear discriminant analysis (LDA). Further the proposed incremental version is combined with extreme learning machine (ELM) in which the ELM is used as a preprocessor before learning. In this first key contribution, the dynamic random expansion characteristic of ELM is combined with the proposed incremental LDA technique, and shown to offer a significant improvement in maximizing the discrimination between points in two different classes, while minimizing the distance within each class, in comparison with other standard state-of-the-art incremental and batch techniques. In the second contribution, the differential equation method for solving the generalized eigenvalue problem is used to derive a novel state-of-the-art purely incremental version of slow feature analysis (SLA) algorithm, termed the generalized eigenvalue based slow feature analysis (GENEIGSFA) technique. Further the time series expansion of echo state network (ESN) and radial basis functions (EBF) are used as a pre-processor before learning. In addition, the higher order derivatives are used as a smoothing constraint in the output signal. Finally, an online extension of the generalized eigenvalue problem, derived from James Stone’s criterion, is tested, evaluated and compared with the standard batch version of the slow feature analysis technique, to demonstrate its comparative effectiveness. In the third contribution, light-weight extensions of the statistical technique known as canonical correlation analysis (CCA) for both twinned and multiple data streams, are derived by using the same existing method of solving the generalized eigenvalue problem. Further the proposed method is enhanced by maximizing the covariance between data streams while simultaneously maximizing the rate of change of variances within each data stream. A recurrent set of connections used by ESN are used as a pre-processor between the inputs and the canonical projections in order to capture shared temporal information in two or more data streams. A solution to the problem of identifying a low dimensional manifold on a high dimensional dataspace is then presented in an incremental and adaptive manner. Finally, an online locally optimized extension of Laplacian Eigenmaps is derived termed the generalized incremental laplacian eigenmaps technique (GENILE). Apart from exploiting the benefit of the incremental nature of the proposed manifold based dimensionality reduction technique, most of the time the projections produced by this method are shown to produce a better classification accuracy in comparison with standard batch versions of these techniques - on both artificial and real datasets.
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Ronald, Kimberley Lee. "Evaluating rural-urban difference in environmental concern in Guyana using log-linear analysis." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ30986.pdf.
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Matsumura, Yuya. "Four research topics on new acoustic liner concepts and modal propagation measurement." Cincinnati, Ohio : University of Cincinnati, 2008. http://rave.ohiolink.edu/etdc/view.cgi?acc_num=ucin1212076970.
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Rossmanith, Gregor. "Concepts of non-linear data analysis applied to the search of non-Gaussianities in the CMB." Diss., lmu, 2011. http://nbn-resolving.de/urn:nbn:de:bvb:19-138198.
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Peifer, Martin. "Concepts from non-linear dynamics and statistical physics applied to complex networks in the life sciences." [S.l. : s.n.], 2006.
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Assis, Aline Mota de Mesquita. "ATIVIDADE DE ESTUDO DO CONCEITO DE TRANSFORMAÇÃO LINEAR NA PERSPECTIVA DA TEORIA DO ENSINO DESENVOLVIMENTAL DE V. V. DAVYDOV." Pontifícia Universidade Católica de Goiás, 2018. http://tede2.pucgoias.edu.br:8080/handle/tede/4059.
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This work falls into the category of research into Theories of Education and Pedagogical Processes, and has as its main investigative focus, the teaching-learning process according to the algebraic concept of linear transformation, based on V.V. Davydov´s theory of developmental teaching. The question it seeks to clarify is : what are the repercussions for teaching the concept of linear transformation, based on the historical-cultural theory, in specific, Davydov's developmental theory, in the process of concept formation by students? Specifically, it aims to analyze the history of the logical development of the concept of linear transformation in order to grasp the relations present in it and the forms of mental movement displayed, towards identifying the mental actions to be contemplated in the planning and conduct of the activity of study; to carry out the study activity through the development of a didactic formation experiment to understand, in the course of the teaching-learning process of the concept of linear transformation, elements that indicate qualitative and quantitative changes in the development of student thinking. To this end research was carried out that consisted of a teaching experiment in a class of Linear Algebra at the Federal Institute of Education, Science and Technology of Goiás - Câmpus Goiânia, based on the assumptions of Davydov. This was completed with fourteen students of the Bachelor in Electrical Engineering graduate course and done so according to the structure of the study activity proposed by Davydov. The procedures for collecting the data were as follows: a written record of semistructured interviews with the teacher, socio-cultural questionnaires completed by the students, a diagnostic instrument for evaluation, an experimental teaching plan and the notes from non-participant direct observers. Data analysis focuses on the process of concept formation and the elements involved in this process from the following categories: transformation of task data into the identification of the general principle of the concept of linear transformation; from modeling to transformation of a model to the concept of linear transformation and the use of the concept of linear transformation as a mental tool. The results showed: the motivation of students during the experimental teaching; an understanding of algebraic concepts after logical-historical analysis by the majority of the research subjects; indicators of the zone of proximal development of the students in relation to the concepts of matrix, function and vector space - considered here as the prerequisites for the formation of the concept of linear transformation, developing the ability to think Mathematically according to the logic of this science; evidence of qualitative changes in the development of theoretical thinking of the research subjects, again, regarding the concept of linear transformation. The main contribution of this research was to show an alternative way of organizing the teaching of the concept of linear transformation, and consequently Linear Algebra. It is believed that even with the contradictions present in the curricular structure of the courses in the areas of the exact and world sciences and in engineering, as well as in the students' school formation, it is possible to carry out teaching based on the theory of developmental teaching and contribute to the theoretical thought formation in the majority of students.
Este trabalho, inscrito na linha de pesquisa Teorias da Educação e Processos Pedagógicos, tem como principal foco investigativo o processo de ensino-aprendizagem do conceito algébrico de transformação linear, fundamentando-se na teoria do ensino desenvolvimental de V. V. Davydov. A questão que se buscou esclarecer foi: que repercussões teriam, no processo de formação de conceitos pelos alunos, o ensino do conceito de transformação linear fundamentado na teoria histórico-cultural, em específico, na teoria do ensino desenvolvimental de Davydov? Especificamente, objetiva-se: analisar a história do desenvolvimento lógico do conceito de transformação linear a fim de apreender as relações nele presentes e o tipo de movimento mental que ele contém para identificar as ações mentais a serem contempladas no planejamento e na condução da atividade de estudo; proceder à realização da atividade de estudo mediante o desenvolvimento de um experimento didático formativo; apreender, no decorrer processo de ensino-aprendizagem do conceito de transformação linear, elementos que indicam mudanças qualitativas e quantitativas no desenvolvimento do pensamento do aluno. Para tanto, realizou-se uma pesquisa que consistiu em um experimento de ensino, baseado nos pressupostos de Davydov, em uma turma de Álgebra Linear do Instituto Federal de Educação, Ciência e Tecnologia de Goiás – Câmpus Goiânia, desenvolvido com quatorze alunos do curso de Bacharelado em Engenharia Elétrica e seguindo a estrutura da atividade de estudo proposta por Davydov. Os procedimentos para a coleta dos dados foram: roteiro de entrevista semiestruturada com o professor, questionário sociocultural dos alunos, instrumento de avaliação diagnóstica, plano de ensino experimental e roteiro de observação direta não participante. A análise dos dados enfoca o processo de formação de conceitos e os elementos intervenientes nesse processo a partir das seguintes categorias: transformação dos dados da tarefa na condução da identificação do princípio geral do conceito de transformação linear; da modelação à transformação de um modelo para o conceito de transformação linear e o uso do conceito de transformação linear como ferramenta mental. Os resultados obtidos revelaram: motivação dos alunos durante o ensino experimental; compreensão dos conceitos algébricos, após a análise lógico-histórica, pela maioria dos sujeitos da pesquisa; indícios de progresso da zona de desenvolvimento proximal dos alunos no que tange aos conceitos de matriz, função e espaço vetorial, considerados aqui como os pré-requisitos para a formação do conceito de transformação linear, desenvolvendo a capacidade de pensar a Matemática de acordo com a forma de pensar desta ciência; indícios de mudanças qualitativas no desenvolvimento do pensamento teórico dos sujeitos da pesquisa quanto ao conceito de transformação linear. A principal contribuição desta pesquisa consistiu em mostrar um caminho alternativo de organização do ensino do conceito de transformação linear, consequentemente, da Álgebra Linear. Acredita-se que, mesmo com as contradições presentes na estrutura curricular dos cursos das áreas de Ciências Exatas e da Terra e Engenharias, bem como na formação escolar dos alunos, é possível realizar um ensino embasado na teoria do ensino desenvolvimental e contribuir para a formação do pensamento teórico da maioria dos alunos
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Rossini, Giacomo. "Sviluppo di un concept per il debottlenecking di una linea produttiva di un intermedio di produzione." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
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Il presente elaborato di tesi è stato svolto in collaborazione con l’azienda BASF presso il sito di Pontecchio Marconi (BO) specializzato nella produzione di additivi per materie plastiche. È stato sviluppato un concept per il debottlenecking della linea di produzione di un intermedio. Una volta aver definito la sezione di idrogenazione come il collo di bottiglia, sono state proposte due alternative di ottimizzazione del sistema di raffreddamento dei reattori che aumentano la capacità produttiva di oltre il 5%. È stato analizzato l’impatto dell’aumento di produzione dell’intermedio di interesse sull’impianto di distribuzione dell’idrogeno, principale materia prima coinvolta, dal punto di vista della sicurezza senza rilevare criticità. Inoltre, è stata valutata la possibilità di un cambio di tecnologia di produzione dell’idrogeno valutandone la convenienza economica. Infine, considerando la proiezione dei volumi futuri di produzione dell’intermedio di interesse, la sezione di distillazione della linea produttiva diventerà un collo di bottiglia. Quest’ultima è costituita da due Agitated Thin Film Evaporator in serie. Lo scopo dell’analisi è quello di verificare l’efficacia delle condizioni operative attuali, e di proporre due soluzioni alternative di debottlenecking: una con gli evaporatori in parallelo e con l’utilizzo di vapore di servizio; una con gli evaporatori in serie e con l’utilizzo di olio diatermico come fluido riscaldante.
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Goel, Rahul S. M. Massachusetts Institute of Technology. "Study of an advanced helmet liner concept to reduce TBI : experiments & simulation using sandwich structures." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/62878.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2011.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student submitted PDF version of thesis.
Includes bibliographical references (p. 123-130).
A large percentage of combat troops suffered Traumatic Brain Injuries (TBI) due to Improvised Explosive Devices (IEDs) in recent wars in the Middle East. The majority of TBIs were caused by exposure to blast waves. Use of advanced body armor has decreased the number of fatalities due to impacts after the explosions, increasing the number of observed non-fatal brain injuries from the blast waves. A large number of TBIs due to impact hits are also reported in skiers, bicyclists, football players etc. A new design concept for the helmet liners is being proposed that introduces solid or fluid filler material in channels inside the helmet liner. The main emphasis has been to improve the attenuation of incoming shock waves in the Army helmets; however, some impacts studies were also carried out for sports helmets. Directed blast experiments in collaboration with Purdue University and numerical studies using the ConWep module available in ABAQUS v6.10 are carried out. Fluid fillers are modeled using the coupled Eulerian-Lagrangian (CEL) functionality of ABAQUS. Preliminary results using flat plate sandwich structures with rectangular channels show that the use of high density filler material results in higher levels of blast mitigation. The peak transmitted overpressure is substantially reduced, while the duration of the positive pressure pulse and the rise time are increased leading to reduced pressure gradients. Fluid filler materials were also found to be promising. Viscosity was not found to be a potential mechanism for blast mitigation as hypothesized. No significant advantage of using circular or criss-cross channel geometries was observed. Prototypes of the first design of the helmet liner with channels have been fabricated, and their testing is under way. Development of a numerical model to observe the response to blast of the modified liner coupled with the Army's Advanced Combat Helmet (ACH) and a human head is also currently in progress. Experimental impact studies were carried out comparing POC ski helmets with standard ski helmets. Over multiple impacts, POC ski helmets showed substantially lower peak accelerations. Different filler materials in the sandwich structures were drop tested. Both the numerical model and the experiments showed higher impact attenuation by the use of viscous fluid in the sandwich structures subjected to drop tests.
by Rahul Goel.
S.M.
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Hull, Lynette. "FRACTION MODELS THAT PROMOTE UNDERSTANDING FOR ELEMENTARY STUDENTS." Master's thesis, University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3127.
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This study examined the use of the set, area, and linear models of fraction representation to enhance elementary students' conceptual understanding of fractions. Students' preferences regarding the set, area, and linear models of fractions during independent work was also investigated. This study took place in a 5th grade class consisting of 21 students in a suburban public elementary school. Students participated in classroom activities which required them to use manipulatives to represent fractions using the set, area, and linear models. Students also had experiences using the models to investigate equivalent fractions, compare fractions, and perform operations. Students maintained journals throughout the study, completed a pre and post assessment, participated in class discussions, and participated in individual interviews concerning their fraction model preference. Analysis of the data revealed an increase in conceptual understanding. The data concerning student preferences were inconsistent, as students' choices during independent work did not always reflect the preferences indicated in the interviews.M.A.
Department of Teaching and Learning Principles
Education
K-8 Mathematics and Science Education
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Pinto-Guillaume, Ezequiel. "Beyond Linear Explanation : A theoretical study of definitions, concepts and discourses about the Sami people’s cultural heritage in Sweden." Thesis, Stockholms universitet, Institutionen för kultur och estetik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-121526.
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The Sami people of Northern Europe live in a cultural region (Sápmi), which stretches across the northern parts of Norway, Sweden, Finland and Russia. An authorized heritage discourse in these countries interpret Sami cultural heritage from a Westernized point-of-view. Higher cultural institutions use today definitions which are based on a prevailing authorized heritage discourse, while others avoid or feel no need to use the term “cultural heritage”. Some Sami institutions have recently begun to use definitions of cultural heritage that agree with a Westernized point-of-view. However, there are a few published definitions by the Sami-people of their own culture in official homepages and regional organizations that present a different discourse. With this study I hope to be able to shed some light upon at least two discourses: 1. that of the ruling-state and 2. the Sami people’s own.
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Costa, Fausto Guzzo da. "Employing nonlinear time series analysis tools with stable clustering algorithms for detecting concept drift on data streams." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-13112017-105506/.
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Several industrial, scientific and commercial processes produce open-ended sequences of observations which are referred to as data streams. We can understand the phenomena responsible for such streams by analyzing data in terms of their inherent recurrences and behavior changes. Recurrences support the inference of more stable models, which are deprecated by behavior changes though. External influences are regarded as the main agent actuacting on the underlying phenomena to produce such modifications along time, such as new investments and market polices impacting on stocks, the human intervention on climate, etc. In the context of Machine Learning, there is a vast research branch interested in investigating the detection of such behavior changes which are also referred to as concept drifts. By detecting drifts, one can indicate the best moments to update modeling, therefore improving prediction results, the understanding and eventually the controlling of other influences governing the data stream. There are two main concept drift detection paradigms: the first based on supervised, and the second on unsupervised learning algorithms. The former faces great issues due to the labeling infeasibility when streams are produced at high frequencies and large volumes. The latter lacks in terms of theoretical foundations to provide detection guarantees. In addition, both paradigms do not adequately represent temporal dependencies among data observations. In this context, we introduce a novel approach to detect concept drifts by tackling two deficiencies of both paradigms: i) the instability involved in data modeling, and ii) the lack of time dependency representation. Our unsupervised approach is motivated by Carlsson and Memolis theoretical framework which ensures a stability property for hierarchical clustering algorithms regarding to data permutation. To take full advantage of such framework, we employed Takens embedding theorem to make data statistically independent after being mapped to phase spaces. Independent data were then grouped using the Permutation-Invariant Single-Linkage Clustering Algorithm (PISL), an adapted version of the agglomerative algorithm Single-Linkage, respecting the stability property proposed by Carlsson and Memoli. Our algorithm outputs dendrograms (seen as data models), which are proven to be equivalent to ultrametric spaces, therefore the detection of concept drifts is possible by comparing consecutive ultrametric spaces using the Gromov-Hausdorff (GH) distance. As result, model divergences are indeed associated to data changes. We performed two main experiments to compare our approach to others from the literature, one considering abrupt and another with gradual changes. Results confirm our approach is capable of detecting concept drifts, both abrupt and gradual ones, however it is more adequate to operate on complicated scenarios. The main contributions of this thesis are: i) the usage of Takens embedding theorem as tool to provide statistical independence to data streams; ii) the implementation of PISL in conjunction with GH (called PISLGH); iii) a comparison of detection algorithms in different scenarios; and, finally, iv) an R package (called streamChaos) that provides tools for processing nonlinear data streams as well as other algorithms to detect concept drifts.Diversos processos industriais, científicos e comerciais produzem sequências de observações continuamente, teoricamente infinitas, denominadas fluxos de dados. Pela análise das recorrências e das mudanças de comportamento desses fluxos, é possível obter informações sobre o fenômeno que os produziu. A inferência de modelos estáveis para tais fluxos é suportada pelo estudo das recorrências dos dados, enquanto é prejudicada pelas mudanças de comportamento. Essas mudanças são produzidas principalmente por influências externas ainda desconhecidas pelos modelos vigentes, tal como ocorre quando novas estratégias de investimento surgem na bolsa de valores, ou quando há intervenções humanas no clima, etc. No contexto de Aprendizado de Máquina (AM), várias pesquisas têm sido realizadas para investigar essas variações nos fluxos de dados, referidas como mudanças de conceito. Sua detecção permite que os modelos possam ser atualizados a fim de apurar a predição, a compreensão e, eventualmente, controlar as influências que governam o fluxo de dados em estudo. Nesse cenário, algoritmos supervisionados sofrem com a limitação para rotular os dados quando esses são gerados em alta frequência e grandes volumes, e algoritmos não supervisionados carecem de fundamentação teórica para prover garantias na detecção de mudanças. Além disso, algoritmos de ambos paradigmas não representam adequadamente as dependências temporais entre observações dos fluxos. Nesse contexto, esta tese de doutorado introduz uma nova metodologia para detectar mudanças de conceito, na qual duas deficiências de ambos paradigmas de AM são confrontados: i) a instabilidade envolvida na modelagem dos dados, e ii) a representação das dependências temporais. Essa metodologia é motivada pelo arcabouço teórico de Carlsson e Memoli, que provê uma propriedade de estabilidade para algoritmos de agrupamento hierárquico com relação à permutação dos dados. Para usufruir desse arcabouço, as observações são embutidas pelo teorema de imersão de Takens, transformando-as em independentes. Esses dados são então agrupados pelo algoritmo Single-Linkage Invariante à Permutação (PISL), o qual respeita a propriedade de estabilidade de Carlsson e Memoli. A partir dos dados de entrada, esse algoritmo gera dendrogramas (ou modelos), que são equivalentes a espaços ultramétricos. Modelos sucessivos são comparados pela distância de Gromov-Hausdorff a fim de detectar mudanças de conceito no fluxo. Como resultado, as divergências dos modelos são de fato associadas a mudanças nos dados. Experimentos foram realizados, um considerando mudanças abruptas e o outro mudanças graduais. Os resultados confirmam que a metodologia proposta é capaz de detectar mudanças de conceito, tanto abruptas quanto graduais, no entanto ela é mais adequada para cenários mais complicados. As contribuições principais desta tese são: i) o uso do teorema de imersão de Takens para transformar os dados de entrada em independentes; ii) a implementação do algoritmo PISL em combinação com a distância de Gromov-Hausdorff (chamado PISLGH); iii) a comparação da metodologia proposta com outras da literatura em diferentes cenários; e, finalmente, iv) a disponibilização de um pacote em R (chamado streamChaos) que provê tanto ferramentas para processar fluxos de dados não lineares quanto diversos algoritmos para detectar mudanças de conceito.
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Rossmanith, Gregor [Verfasser], and Gregor [Akademischer Betreuer] Morfill. "Concepts of non-linear data analysis applied to the search of non-Gaussianities in the CMB / Gregor Rossmanith. Betreuer: Gregor Morfill." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2011. http://d-nb.info/1018847197/34.
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Halasz, Christopher. "Advanced Trailing Edge Blowing Concepts for Fan Noise Control: Experimental Validation." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/34040.
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This thesis documents trailing edge blowing research performed to reduce rotor / stator interaction noise in turbofan engines. The existing technique of filling every velocity deficit requires a large amount of air and is therefore impractical. The purpose of this research is to investigate new blowing configurations in order to achieve noise reduction with lesser amounts of air. Using the new configurations air is not injected into every fan blade, but is instead varied circumferentially. For example, blowing air may be applied to alternating fan blades. This type of blowing configuration both reduces the amount of air used and changes the spectral shape of the tonal interaction noise. The original tones at the blade passing frequency and its harmonics are reduced and new tones are introduced between them. This change in the tonal spectral shape increases the performance of acoustic liners used in conjunction with trailing edge blowing. This thesis presents numerical predictions performed to estimate the sound power reductions due to these concepts, as well as experimental results taken on the ANCF rig at NASA Glenn for validation purposes. The results show that the new concepts are successful in increasing the efficiency of trailing edge blowing.Master of Science
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Castilho, Anderson Almeida [UNESP]. "Estudo do comportamento biomecânico em protocolos modificados de Branemark (conceito All-on-Four): análise por extensometria linear elétrica." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/105528.
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O objetivo deste estudo foi analisar in vitro, por meio de extensometria linear elétrica, o comportamento biomecânico em protocolos de Brånemark em mandíbulas, modificados pelo conceito All-on-Four, para que seja possível se estabelecer uma correlação entre tensão, deformação e eventos biomecânicos que possam acontecer no tecido ósseo peri-implantar referente a mudança do eixo de instalação de implantes posicionados próximos às extensões em cantlever. Para tanto, foram confeccionados dez modelos experimentais (G1, n=5) e (G2, n=5) homogêneos à base de poliuretano nos quais foram instalados quatro implantes de conexão externa e quatro pilares tipo micro-unit em duas configurações para os implantes distais. Para o efeito configuração (Configuração) no G1, os implantes foram instalados de forma axial e paralelos entre si. Para o efeito configuração no G2, os dois implantes distais foram instalados em angulação de 300 - sentido distal. O monitoramento das deformações foi obtido em 3 níveis de profundidade (NP) (cervical, médio e profundo) para cada implante, assim como em dois pontos de aplicação de carregamento estático de 50N (PAC) (ponto A em cantlever e ponto B em ponto mediano). Foram coletadas três leituras de microdeformação (ε) para cada extensômetro. Os dados coletados foram submetidos aos testes estatísticos ANOVA e Tukey (α=5%). Para as condições experimentais, os grupos após ensaio...
This study aimed to evaluate in vitro, the biomechanical behavior in Brånemark protocols modified by the All-on-Four concept, by strain gauge analysis, to establish a correlation between stress, strain and biological events that may occur in the peri-implant bone tissue in two diferent distaly implants configuration. Ten polyurethane experimental models were fabricated (Group 1, n = 5) and (Group 2, n = 5) which were installed four external hex implants and four micro-unit abutments, in two diferent tilting set-up for the distal implants. For the configuration effect in G1, the implants were installed axially and parallel to each other. In G2 group, the two distal implants were tilted 30 degrees. The microstrain data were obtained in 3 deep levels (NP) (cervical, medium and deep) via two linear strain gauges bonded on the mesial and distal surface for each implant. A static load of 50 N was applied on two points (PAC) (A - cantlever point and B - median point). Three microstrain measurements (με) were performed for each strain gauge. Data were analyzed by ANOVA and Tukey’s test for multiple comparisons at 5% level of significance. For the experimental conditions, the groups after testing showed mean ... (Complete abstract click electronic access below)
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Castilho, Anderson Almeida. "Estudo do comportamento biomecânico em protocolos modificados de Branemark (conceito All-on-Four) : análise por extensometria linear elétrica /." São José dos Campos :, 2012. http://hdl.handle.net/11449/105528.
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Orientador: Carlos Augusto PavanelliBanca: Alberto Noryuki Kojima
Banca: Estevão Tomomitsu Kimpara
Banca: Alfredo Mikail Melo Mesquita
Banca: Marco Antonio Melloncini
Resumo: O objetivo deste estudo foi analisar in vitro, por meio de extensometria linear elétrica, o comportamento biomecânico em protocolos de Brånemark em mandíbulas, modificados pelo conceito All-on-Four, para que seja possível se estabelecer uma correlação entre tensão, deformação e eventos biomecânicos que possam acontecer no tecido ósseo peri-implantar referente a mudança do eixo de instalação de implantes posicionados próximos às extensões em cantlever. Para tanto, foram confeccionados dez modelos experimentais (G1, n=5) e (G2, n=5) homogêneos à base de poliuretano nos quais foram instalados quatro implantes de conexão externa e quatro pilares tipo micro-unit em duas configurações para os implantes distais. Para o efeito configuração (Configuração) no G1, os implantes foram instalados de forma axial e paralelos entre si. Para o efeito configuração no G2, os dois implantes distais foram instalados em angulação de 300 - sentido distal. O monitoramento das deformações foi obtido em 3 níveis de profundidade (NP) (cervical, médio e profundo) para cada implante, assim como em dois pontos de aplicação de carregamento estático de 50N (PAC) (ponto A em cantlever e ponto B em ponto mediano). Foram coletadas três leituras de microdeformação (ε) para cada extensômetro. Os dados coletados foram submetidos aos testes estatísticos ANOVA e Tukey (α=5%). Para as condições experimentais, os grupos após ensaio... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: This study aimed to evaluate in vitro, the biomechanical behavior in Brånemark protocols modified by the All-on-Four concept, by strain gauge analysis, to establish a correlation between stress, strain and biological events that may occur in the peri-implant bone tissue in two diferent distaly implants configuration. Ten polyurethane experimental models were fabricated (Group 1, n = 5) and (Group 2, n = 5) which were installed four external hex implants and four micro-unit abutments, in two diferent tilting set-up for the distal implants. For the configuration effect in G1, the implants were installed axially and parallel to each other. In G2 group, the two distal implants were tilted 30 degrees. The microstrain data were obtained in 3 deep levels (NP) (cervical, medium and deep) via two linear strain gauges bonded on the mesial and distal surface for each implant. A static load of 50 N was applied on two points (PAC) (A - cantlever point and B - median point). Three microstrain measurements (με) were performed for each strain gauge. Data were analyzed by ANOVA and Tukey's test for multiple comparisons at 5% level of significance. For the experimental conditions, the groups after testing showed mean ... (Complete abstract click electronic access below)
Doutor
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Manfrim, Amanda Liz Pacífico. "O conceito de estabilizabilidade fraca para sistemas lineares com saltos Markovianos." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-13092006-153315/.
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Este trabalho introduz os conceitos de controlabilidade fraca e estabilizabilidade fraca para sistemas lineares com parâmetros sujeitos a saltos Markovianos a tempo discreto. É, inicialmente, construída uma coleção de matrizes C que se assemelha às matrizes de controlabilidade de sistemas lineares deterministicos. Essa coleção de matrizes C nos permite definir um conceito de controlabilidade fraca, requerendo que elas sejam de posto completo, assim como introduzir um conceito de estabilizabilidade fraca, dual ao conceito de detetabilidade fraca encontrado na literatura de sistemas com saltos de Markov. Uma característica importante do conceito de estabilizabilidade fraca é a de generalizar o conceito de estabilizabilidade na média quadrática, anteriormente encontrado na literatura. O papel do conceito da estabilizabilidade fraca no problema de filtragem é investigado através de casos de estudo. Estes casos de estudo são desenvolvidos no contexto do filtro de Kalman com observação do parâmetro de Markov e sugerem que a estabilizabilidade fraca em conjunto com a detetabilidade na média quadrática garantem que o estimador seja estável na média quadrática.This work introduces weak controllability and weak stabilizability concepts for discretetime Markov jump linear system. We introduce a collection of matrices C that resembles controllability matrices of deterministic linear systems. The collection of matrices C allows us to define a weak controllability concept by requiring that the matrices are full rank, as well as to introduce a weak stabilizability concept that is a dual of the weak detectability concept found in the literature of Markov jump systems. An important feature of the introduced concept is that it generalizes the previous concept of mean square stabilizability. The role that the weak stabilizability concept plays in the filtering problem is investigated via case studies. These case studies are developed in the context of Kalman filtering with observation of the Markov parameter, they suggest that weak stabilizability together with mean square stabilizability ensure that the state estimator is mean square stable.
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Duque, Gutiérrez María Paz. "Análise elastoplástica de estruturas metálicas usando o conceito de rótulas plásticas e o algoritmo de retorno radial." reponame:Repositório Institucional da UnB, 2014. http://repositorio.unb.br/handle/10482/16938.
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Dissertação (mestrado)—Universidade de Brasília, Faculdade de Tecnologia, Departamento de Engenharia Civil e Ambiental, 2014.Submitted by Ana Cristina Barbosa da Silva (annabds@hotmail.com) on 2014-11-17T18:27:55Z No. of bitstreams: 1 2014_MariaPazDuqueGutiérrez.pdf: 1529931 bytes, checksum: 45a09fa4d61bdf982f3a20ecc790f131 (MD5)
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O objetivo deste trabalho é o desenvolvimento e implementação de uma rotina de aplicação prática para uma análise elastoplástica de primeira ordem (pequenas deformações e pequenos deslocamentos), baseada nos conceitos de algoritmo de retorno radial, preditor/corretor e o conceito de rótulas plásticas. Espera-se obter uma ferramenta numérica precisa e computacionalmente econômica para a solução de diferentes tipos de estruturas metálicas. Para a análise limite, é utilizada uma superfície de escoamento assumida como uma função convexa e contínua das forças, agindo na seção transversal da estrutura. Para a solução das equações de equilíbrio, é utilizado um método iterativo baseado no método de Newton-Raphson combinado com o método de comprimento de arco. É introduzido o endurecimento isotrópico no regime plástico. As deformações plásticas são regidas pelo princípio da normalidade e são restritas aos extremos dos elementos. Os extremos dos elementos podem mudar bruscamente do estado elástico ao estado plástico. A matriz modular tangente consistente é determinada e aplicada sendo essencial para obter precisão e convergência. Finalmente, diferentes exemplos numéricos são estudados para avaliar a eficiência e aplicabilidade dos métodos empregados. ______________________________________________________________________________ ABSTRACT
The objective of this work is the development and implementation of a routine of practical application for a first order elastoplastic analysis (small strains and small displacements). Based on the concepts of radial return algorithm, predictor / corrector and the concept of plastic hinge. It is expected to obtain a numerical tool accurate and computationally economical for the solution of different metal structural typologies. For the limit analysis is used a yield surface assumed as a convex and continuous function of the forces acting at the cross section of the structure and therefore, for the solution of the equilibrium equations is used an iterative method based on the Newton-Raphson method combined whit the arc length method. Isotropic hardening in the plastic regime is introduced. The plastic deformations are governed by the principle of normality and are restricted to the extremes of the elements. The extremes of the elements can change abruptly from elastic to plastic state. Consistent modular tangent matrix is determined and applied since it is essential for the accuracy and convergence. Finally, different numerical examples are studied to evaluate the efficiency and applicability of the methods employed.
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Torres, Leo Cecilia Antonia. "Aproximación al concepto de función lineal : el caso de una alumna invidente que cursa el segundo grado de secundaria." Master's thesis, Pontificia Universidad Católica del Perú, 2013. http://tesis.pucp.edu.pe/repositorio/handle/123456789/4742.
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El presente trabajo de tesis explora el aprendizaje que una alumna invidente realiza al acercarse a conceptos algebraicos relacionados con la función lineal. Las nociones que se han escogido para aproximarse a este concepto son pendiente, par ordenado, recta, correspondencia unívoca. Las simbolizaciones utilizadas y asociadas han sido las variables x e y.
La investigación se realizó en el Centro de Rehabilitación de Ciegos de Lima, CERCIL, y de allí se eligió como sujeto de estudio a una alumna que presenta ceguera congénita cuya dolencia se acentuó desde los ocho años de edad iniciándose, paulatinamente, la anulación de restos visuales.
El objetivo general de esta tesis es analizar los procesos de construcción y aproximación al concepto de función lineal que desarrolla esta alumna mediante el apoyo de recursos mediadores –herramientas materiales y semióticas- adecuados a su aprendizaje.
El marco de referencia teórico utilizado ha sido el Enfoque Ontosemiótico del Conocimiento y la Instrucción Matemática (EOS) que permitió identificar y analizar las prácticas matemáticas; las configuraciones cognitivas; los procesos matemáticos; y los conflictos semióticos que se presentaron en la alumna invidente, y hacer las comparaciones respectivas con los de un alumno vidente. Las técnicas de recojo de información así como las nociones de indicialidad y reflexión de acciones han sido aportadas por la Etnometodología.
Una conclusión que destacamos de este trabajo es que es posible diseñar una secuencia didáctica que permite a una alumna invidente descubrir el concepto de función lineal, su representación algebraica y gráfica, la relación entre ellas mediante la interpretación del coeficiente de la variable como pendiente de la recta (“empinamiento” de ella) y la solución de algunos problemas que involucra la interpretación del punto de intersección de dos rectas. Tal secuencia no es la que usualmente se sigue con alumnos videntes –pero es también admisible para tales casos– y que parte de situaciones-problema contextualizadas y se apoya en diálogos amplios, considerando el contexto social y las experiencias de la alumna. Las configuraciones cognitivas elaboradas, de las soluciones de las situaciones-problema propuestas a la alumna invidente son análogas a las configuraciones epistémicas adoptadas, referidas a soluciones de un alumno vidente de quinto año de secundaria.Tesis
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Tonioni, Giulia. "analisi e ottimizzazione del processo di progettazione: il caso studio della linea Ninfea." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
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L'elaborato di tesi nasce da un tirocinio formativo presso Sitmatic Italia, azienda che progetta, produce e commercializza sedute ergonomiche da lavoro. Durante la collaborazione con l'azienda ho potuto occuparmi dello sviluppo progettuale di una linea di sedute e di un divano modulare e della loro comunicazione, seguendo la progettazione dal concept alla produzione.
Il progetto di tesi ha l'obiettivo di concretizzare le competenze apprese durante il percorso di studi e l'esperienza acquisita dalla collaborazione con questa realtà aziendale. Il risultato è la realizzazione di uno strumento di gestione del processo di progettazione che mette in relazione le necessità aziendali e la figura del designer.
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Merkle, Erich R. "Predicting urban elementary student success and passage on Ohio's high-stakes achievement measures using DIBELS Oral Reading Fluency and informal Math Concepts and Applications: An exploratory study employing hierarchical linear modeling." Kent State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=kent1285945471.
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Lachaud, Fabrice. "La structure familiale des Craon du XIè siècle à 1415 : le concept lignager en question." Phd thesis, Université Michel de Montaigne - Bordeaux III, 2012. http://tel.archives-ouvertes.fr/tel-00724925.
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Le 25 octobre 1415, avec la disparition des derniers représentants du groupe par filiation directe, s'éteignait au combat le lignage de Craon dont la renommée et la fortune avaient été acquises, entre autres, sur les champs de bataille. Notre travail s'inscrit dans une perspective chronologique : la genèse du lignage des Craon au XIe siècle puis son fonctionnement jusqu'à sa disparition à Azincourt. À partir de l'étude sur la famille de Craon, nous proposons une réflexion sur le concept lignager. Pouvons-nous d'ailleurs parler sans nuance de lignage ? Le lignage du XIIe siècle ne ressemble pas à celui des siècles suivants : il s'agit d'une structure de parenté complexe recouvrant des réalités multiples. Si la nécessité d'une terminologie commune nous apparaît évidente, il convient cependant de rester prudent sur l'usage de " lignage ". Son emploi abusif en a appauvri le sens à tel point que nous avons l'impression que ce terme pose aujourd'hui un problème sémantique : peut-on opposer systématiquement deux structures de parenté - " carolingienne " et lignagère ? Le corpus documentaire des Craon nous met dans une position inconfortable puisqu'il nous oriente sur une structure de parenté particulière : le lignage. L'enjeu de ce travail consiste donc à formuler un questionnement sur le lignage à travers une documentation partielle et orientée qui en postule l'existence. L'emploi de ce terme ne nous offre qu'une vision simpliste de la parenté et ne prend pas assez en compte d'autres formes qui coexistent au même moment : sur une structure patrilinéaire de transmission des biens et des pouvoirs se plaque un système de filiation indifférenciée. Le monument funéraire des Craon, dans la chapelle des Cordeliers à Angers, réalisé par Maurice V de Craon à la fin du XIIIe siècle, est un document essentiel : il illustre une conception de la famille telle qu'elle se manifeste dans les actes de la pratique accordant une place essentielle aux alliances, au moins autant qu'à la filiation et dans laquelle la notion de lignage est difficile à cerner. Or, une telle représentation peut coexister avec d'autres, répondant à d'autres besoins et véhiculant d'autres messages : le lignage n'oblitère pas d'autres formes de parenté. Notre travail nous invite à remettre en cause les schémas modèles et à voir la parenté comme une intrication de systèmes diversement opératoires, par effet de sources ou selon le contexte, soumis au poids des normes canoniques omniprésentes à l'époque.
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Wollmann, Rafael Rodrigues Guimarães. "Uma abordagem de decomposição para o modelo matemático do plano mestre de produção que utiliza o conceito de Clearing function para estimar capacidade disponivel de utilização de recursos /Rafael Rodrigues Guimarães Wollmann ; orientador, Raimundo José Borges de Sampaio." reponame:Biblioteca Digital de Teses e Dissertações da PUC_PR, 2012. http://www.biblioteca.pucpr.br/tede/tde_busca/arquivo.php?codArquivo=2372.
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Dissertação (mestrado) - Pontifícia Universidade Católica do Paraná, Curitiba, 2012Bibliografia: f. 57-58
As formulações de programação matemática que abordam problemas de planejamento de produção tem sido propostas desde 1950, e desde então apresentam uma constante evolução. O modelo matemático do problema de planejamento de produção de grande porte, por con
The mathematical programming formulations that address production planning problems have been proposed since 1950, and since then have a constant evolution. The mathematical production planning problem contains many functional constraints and it is in pra