Dissertations / Theses: 'Division of Physics'

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Zhang, Qi. "Integrating experimentation and instrumentation in upper-division physics." Manhattan, Kan. : Kansas State University, 2009. http://hdl.handle.net/2097/1694.

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Barraza-Felix, Sergio. "Regularization of the image division approach to blind deconvolution." Diss., The University of Arizona, 2002. http://hdl.handle.net/10150/284330.

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Randomly inhomogeneous media, such as a turbulent atmosphere, degrade images taken by optical systems. This imposes strong limitations on the resolution achieved by optical systems. The quest for increasing the angular resolution of terrestrial telescopes is still open. This work is a small contribution in that quest. A problem of blind deconvolution arises when one attempts to restore a short-exposure image that has been degraded by random atmospheric turbulence. The image division method attacks this problem by using two short-exposure images of the same object and taking the ratio of their respective Fourier transforms. The result is the quotient of the unknowns transfer functions. The latter are expressed as Fourier series in corresponding point-spread functions. Cross multiplying the division equation gives a system of linear equations with the point-spread functions as unknowns. It is found that the system of linear equations, resulting from the implementation of the image division method, has a multiplicity of solutions. Moreover such system of equations is poorly conditioned. This brings the necessity of a regularization approach. This dissertation describes the development and implementation of a regularization algorithm for the image division method. Using this regularization algorithm the blind deconvolution problem is posed as a constrained least-squares problem. A least-squares solution is found by computing a QR factorization of the system matrix. The Householder transformation method is used to find this factorization. The QR decomposition transforms the problem into an upper-triangular system of equations which is solved by backsubstitution. Prior partial knowledge about the point-spread functions and the object (such as finite support and positivity) is used to impose constrains on the solution, solving the multiplicity-solutions problem. The regularization algorithm is tested with simulated and real data. Good quality reconstructions are obtained from the implementation of the regularized image division method on computer simulated atmospheric degraded images corrupted with up to 5% of additive Gaussian noise, or corrupted with Poisson noise with 100 or more photons as the average number of photons per pixel. It also yields good results when tested with real infrared short-exposure images.

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Wilcox, Bethany R. "New tools for investigating student learning in upper-division electrostatics." Thesis, University of Colorado at Boulder, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3704843.

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Student learning in upper-division physics courses is a growing area of research in the field of Physics Education. Developing effective new curricular materials and pedagogical techniques to improve student learning in upper-division courses requires knowledge of both what material students struggle with and what curricular approaches help to overcome these struggles. To facilitate the course transformation process for one specific content area -- upper-division electrostatics -- this thesis presents two new methodological tools: (1) an analytical framework designed to investigate students' struggles with the advanced physics content and mathematically sophisticated tools/techniques required at the junior and senior level, and (2) a new multiple-response conceptual assessment designed to measure student learning and assess the effectiveness of different curricular approaches. We first describe the development and theoretical grounding of a new analytical framework designed to characterize how students use mathematical tools and techniques during physics problem solving. We apply this framework to investigate student difficulties with three specific mathematical tools used in upper-division electrostatics: multivariable integration in the context of Coulomb's law, the Dirac delta function in the context of expressing volume charge densities, and separation of variables as a technique to solve Laplace's equation. We find a number of common themes in students' difficulties around these mathematical tools including: recognizing when a particular mathematical tool is appropriate for a given physics problem, mapping between the specific physical context and the formal mathematical structures, and reflecting spontaneously on the solution to a physics problem to gain physical insight or ensure consistency with expected results. We then describe the development of a novel, multiple-response version of an existing conceptual assessment in upper-division electrostatics courses. The goal of this new version is to provide an easily-graded electrostatics assessment that can potentially be implemented to investigate student learning on a large scale. We show that student performance on the new multiple-response version exhibits a significant degree of consistency with performance on the free-response version, and that it continues to provide significant insight into student reasoning and student difficulties. Moreover, we demonstrate that the new assessment is both valid and reliable using data from upper-division physics students at multiple institutions. Overall, the work described in this thesis represents a significant contribution to the methodological tools available to researchers and instructors interested in improving student learning at the upper-division level.

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Sittner, Assa. "Vers une étude de la division asymétrique des cellules à l'échelle de la molécule unique." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2010. http://tel.archives-ouvertes.fr/tel-00815355.

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Le but de ce projet est de développer de nouveaux outils pour explorer des processus d'organisation intracellulaire dynamique dans les cellules vivantes, avec une sensibilité sans précédent. Ce travail se concentre sur deux aspects principaux : le développement d'outils pour l'étude en molécule unique de la division cellulaire asymétrique, et la mise au point de sondes monovalentes qui permettent le suivi d'une protéine individuelle utilisant un nanocristal semiconducteur (ou quantum dot, QD). La division cellulaire asymétrique (DCA) est définie comme une division cellulaire dans laquelle une cellule mère donne naissance à deux cellules filles avec des destins différents (ce qui se manifeste à travers par exemple la taille, le contenu ou le profil d'expression). Notre étude se concentre sur la division cellulaire asymétrique dans les cellules souches neurales de Drosophila melanogaster, appelés neuroblastes. Au cours de la division asymétrique des neuroblasts, avant la séparation de la cellule-mère en deux cellules-filles, certaines molécules dans le cytoplasme se redistribuent de façon asymétrique (polarisée). Ce travail a montré la faisabilité de l'étude de la division cellulaire asymétrique à l'échelle de la molécule unique. Les méthodes ont été conçues et développées pour la conjugaison et la caractérisation des complexes QD-protéines. Nous avons réussi à cibler les protéines localisées de manière asymétrique dans des neuroblastes en division. Cela ouvre la voie à des études intracellulaires de ce phénomène, en utilisant des QDs individuels Ce travail a également mis en évidence la limite principale de ce système expérimental : la nature tridimensionnelle des mouvements. En raison de l'épaisseur de la neuroblate, les QDs sortent du plan focal très souvent. En conséquence, l'obtention des trajectoires suffisamment longues pour le calcul des paramètres de transport, devient très difficile. Toutefois, certaines informations peuvent encore être extraites des données que nous avons obtenues, en analysant la répartition spatiale de "courts-déplacements" dans les films obtenus. Les déplacements des QDs entre deux images consécutives sont regroupés et analysés en fonction de leur emplacement par rapport à une carte polaire normalisée d'un neuroblaste polarisé. Une telle analyse n'a pas besoin des trajectoires longues mais peut, quand même, révèler des differences dans la mobilité des protéines entre les differents domaines de la cellule. Cette analyse est actuellement en cours. Nous avons aussi réussi à produire des sondes monovalentes pour le suivi des proteines membranaires extracellulaires. Ces sondes sont basées sur un fragment de chaîne variable d'anticorp (ScFv). Ces sondes doivent avoir des nombreuses applications dans le suivi des diverses protéines membranaires, mais doivent être améliorées afin de répondre aux exigences rigoureuses du suivi intracellulaire.

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Masson, Soizic. "Etude structurale d'un complexe de trois protéines de la division du pneumocoque, DivIB, DivIC et FtsL." Phd thesis, Université Joseph Fourier (Grenoble), 2008. http://tel.archives-ouvertes.fr/tel-00352348.

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FtsL, DivIC et DivIB sont trois protéines membranaires impliquées dans la division bactérienne. Leur fonction n'est pas totalement comprise, mais semble mutuellement dépendante, notamment à travers la formation de complexes. Pour contribuer à la connaissance structurale des protéines de la division bactérienne et apporter des indices sur la fonction des trois protéines citées, une étude structurale a été menée sur un système modèle de protéines recombinantes solubles de S. pneumoniae: FtsL, DivIC et DivIB. La partie extracellulaire de DivIB, un complexe contraint des parties extracellulaires de FtsL et DivIC, et l'interaction entre ce complexe et la partie extracellulaire de DivIB ont été étudiés par plusieurs techniques biophysiques (RMN, SAXS, SANS, BIA par SPR). La partie extracellulaire de DivIB est composée de trois domaines dont le domaine central est structuralement proche de son orthologue chez E. coli, et interagit avec un complexe des parties extracellulaires de DivIC et FtsL, via ce domaine central. Un épitope d'interaction sur ce domaine a été identifié. Les domaines C-terminaux de FtsL et divIC sont essentiels à l'interaction avec la partie extracellulaire de DivIB. Un modèle à basse résolution du complexe de ces trois protéines présente en effet le domaine central de la partie extracellulaire de DivIB à l'extrémité du complexe des parties extracellulaires de DivIC et FtsL. Différents modèles d'association dans la cellule, des protéines DivIB, DivIC et FtsL ont été évalués avec ces nouvelles données structurales.

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Riziotis, Christos. "Advanced Bragg grating based integrated optical devices for wavelength division multiplexing systems." Thesis, University of Southampton, 2002. https://eprints.soton.ac.uk/15489/.

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This thesis presents experimental and theoretical work towards the development of advanced integrated planar optical devices for wavelength division multiplexing (WDM) applications in optical communication systems. The presented work lies within a broad range of research areas, namely: design and simulation of novel Bragg grating based WDM passive devices, their performance characterization in simulated optical communication systems, fabrication and characterization of photosensitive thin films and finally device fabrication using ultraviolet induced refractive index changes. A complete model for the analysis of Bragg grating assisted devices in waveguide structures has been developed. Bragg grating based optical Add/Drop multiplexers (OADM) have been simulated and studied by using this modelling tool. A fully optimised design for an OADM based on null coupler and tilted Bragg grating has been proposed. This device can exhibit optimised Add and Drop actions with suppressed backreflections and crosstalk to a level lower than -40 dB. A novel interferometric OADM configuration based on a full cycle full (100%) coupler is also proposed. This design exhibits fully optimised and symmetrical Add/Drop actions in contrast to the compromised performance of traditional interferometric configurations. A software simulation tool has also been developed and employed for the theoretical characterization of optical filters, linking this way the proposed devices to real communication system issues related to high bit rate WDM networks. The effect of group delay ripple in WDM filters is studied for different modulation formats and a simplified figure of merit is proposed for the characterization of the effect. For the fabrication of photosensitive thin film structures, a prototype in-house Flame Hydrolysis Deposition facility was built and it was initially characterized. Further experimental work involved detailed analysis and characterization of highly photosensitive Lead Germanate glasses grown by Pulsed Laser Deposition. A developed direct UV-writing facility is presented and major issues around the functionality of the technique are discussed, by demonstrating solutions for the control of the optical system. A rapid heat treatment technique is also proposed for locking the enhanced photosensitivity in deuterium loaded germanosilicate glasses and successful preliminary results are demonstrated. This method should allow finally the fabrication of complex all-UV-written devices, which has been limited to date by the degrading photosensitivity during UV writing, due to rapid deuterium outdiffusion.

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Kang, Qiongyue. "Modelling of Multimode Erbium-Doped Fibre Amplifiers for mode-division multiplexed transmission systems." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/386212/.

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This PhD thesis, undertaken within the framework of MODEGAP, covers the design and optimization of high-performance in-line Multimode Erbium-Doped Fiber Amplifiers (MM-EDFAs) or Few-mode (FM) EDFA for next-generation SDM transmission systems based on Mode-Division Multiplexing (MDM). In the MM-EDFAs, minimizing the differential modal gain (DMG) is of paramount importance to prevent system outage. By using an experimentally validated commercial amplifier simulator, I proposed a 2-mode-group EDF design incorporating ring doping that allows accurate modal gain control amongst the two-mode groups using a simple and much more practical LP01 pump mode. Subsequently a 2-mode-group ring-doped EDF according to my design was fabricated in-house and a portable 2-mode-group EDFA with low DMG built and tested, confirming my predictions. My 2-mode-group EDFA design lay at the heart of several successful 2-mode-group fiber based transmission experiments, as listed in this thesis. To investigate the vector modes effects in FM-EDFAs, we developed our own MM-EDFA simulator capable of modelling both the Linear Polarized (LP) modes and the full vector solutions. We have concluded that, in practice, the LP amplifier model is valid and sufficient enough to predict the FM-EDFA performance. I proposed a 4-mode-group EDFA design that offered DMG < 1dB across four-mode groups using a customized pump profile. As the number of guided modes increases, the required pump power also increases which means expensive single-mode pump diodes are needed in the core-pumping approach. Cladding pumping is an alternative way to provide pump radiation with the advantages of reducing the costs. Consequently, I upgraded our in-house amplifier simulator to a cladding-pump-able MM-EDFA design tool incorporating an optimization algorithm (i.e. Genetic Algorithm) that accepts customized criteria and allows a large number of free parameters to be optimized simultaneously. Using this tool, I proposed the designs and optimizations of cladding-pumped 4 and 6-mode-group EDFAs. Apart from the standard step-index MM-EDFAs, I also investigated novel fiber amplifiers with ring-index profiles for SDM applications. The first type of ring-index fiber discussed in this thesis is of solid core and weakly guiding. The solid-core ring core fiber has an advantage of reducing digital signal processing complexity in MDM transmission. I proposed a 6-mode-group ring core multimode erbium doped fiber amplifier (RC-MM-EDFA) capable of providing almost identical gain among the six mode groups within the C band using either core- or cladding-pumped implementations. The second type of ring-index fiber is an air-core fiber that enables the stable transmission of Orbital Angular Momentum (OAM) modes, which can be used as another degree of freedom for information multiplexing. I have created a new variant of my amplifier model targeting OAM modes and have achieved DMG lower than 0.5 dB for 12 OAM modes in an air-core EDF.

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Tan, Rui Zhen. "Phenomenological Models in Biological Physics: Cell Polarity and rDNA Transcription." Thesis, Harvard University, 2011. http://dissertations.umi.com/gsas.harvard:10000.

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Mathematical modeling has been important in the study of biology. Two main challenges with modeling biological problems are the lack of quantitative data and the complexity of biological problems. With the invention of new techniques, like single molecule transcript counting, very quantitative gene expression measurements at the level of single transcript in individual cells can now be obtained. Biological systems are very complex, involving many reactions and players with unknown reaction rates. To reduce the complexity, scientists have often proposed simplified phenomenological models that are tractable and capture the main essence of the biological systems. These simplified models allow scientists to describe the behavior of biological systems with a few meaningful parameters. In this thesis, by integrating quantitative single-cell measurements with phenomenological modeling, we study the (1) roles of Wnt ligands and receptors in sensing and amplification in Caenorhabditis elegans’ P cells and (2) regulation of rDNA transcription in Saccharomyces cerevisiae. The initiation of cell polarity consists of two sequential processes: an external gradient is first sensed and then the resulting signal is amplified by intracellular signaling. It is challenging to determine the role of proteins towards sensing and amplification as these two processes are intertwined. We integrated quantitative single-cell measurements with phenomenological modeling to determine the roles of Wnt ligands and receptors in sensing and amplification in the P cells of Caenorhabditis elegans. By systematically exploring how P cell polarity is altered in Wnt ligand and receptor mutants, we inferred that ligands predominantly affect sensing, whereas receptors are needed for both sensing and amplification. Most eukaryotes contain many tandem repeats of ribosomal RNA genes of which only a subset is transcribed at any given time. Current biochemical methods allow for the determination of the fraction of transcribing repeats (ON) versus nontranscribing repeats (OFF) but do not provide any dynamical information. By using the single molecule transcript counting technique complemented with theoretical modeling, we determine the rate of switching from OFF to ON (activation rate) and the average number of RNA molecules produced during each transcriptional burst (burst size). We explore how these two variables change in mutants and different growth conditions.

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Modir, Bahar. "Problem solving in physics: undergraduates' framing, procedures, and decision making." Diss., Kansas State University, 2017. http://hdl.handle.net/2097/36258.

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Doctor of Philosophy
Department of Physics
Eleanor C. Sayre
In this dissertation I will start with the broad research question of what does problem solving in upper division physics look like? My focus in this study is on students' problem solving in physics theory courses. Some mathematical formalisms are common across all physics core courses such as using the process of separation of variables, doing Taylor series, or using the orthogonality properties of mathematical functions to set terms equal to zero. However, there are slight differences in their use of these mathematical formalisms across different courses, possibly because of how students map different physical systems to these processes. Thus, my first main research question aims to answer how students perform these recurring processes across upper division physics courses. I break this broad question into three particular research questions: What knowledge pieces do students use to make connections between physics and procedural math? How do students use their knowledge pieces coherently to provide reasoning strategies in estimation problems? How do students look ahead into the problem to read the information out of the physical scenario to align their use of math in physics? Building on the previous body of the literature, I will use the theory family of Knowledge in Pieces and provide evidence to expand this theoretical foundation. I will compare my study with previous studies and provide suggestions on how to generalize these theory expansions for future use. My experimental data mostly come from video-based classroom data. Students in groups of 2-4 students solve in-class problems in quantum mechanics and electromagnetic fields 1 courses collaboratively. In addition, I will analyze clinical interviews to demonstrate how a single case study student plays an epistemic game to estimate the total energy in a hurricane. My second research question is more focused on a particular instructional context. How do students frame problem solving in quantum mechanics? I will lay out a new theoretical framework based in epistemic framing that separates the problem solving space into four frames divided along two axes. The first axis models students' framing in math and physics, expanded through the second axis of conceptual problem solving and algorithmic problem solving. I use this framework to show how students navigate problem solving. Lastly, I will use this developed framework to interpret existing difficulties in quantum mechanics.

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Kamil, Ali S. (Ali Syed). "Bytes of Evolution : essays on applying social physics lessons for management effectiveness." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/106253.

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Thesis: S.M. in Engineering and Management, Massachusetts Institute of Technology, School of Engineering, System Design and Management Program, Engineering and Management Program, 2016.
Cataloged from PDF version of thesis. "June 2016."
Includes bibliographical references (pages 88-90).
How can we construct socio-technical system such that they constantly evolve to improve themselves? This is the central question of this thesis. We propose a "senseable Kaizen" philosophy. This involves the central tenets of the Kaizen strategy while incorporating passive and active sensing data collection to analyze the easily missed social cues critical to understand and improve a socio-technical system. We test our hypothesis by applying it to three disparate systems ranging in size, complexity, and processes. In the LVPEI experiment, we identified that prolonged patient wait times were the outcome of the lack of adherence to appointment-based system. Only 33% of the patients showed up on time. The large volume of walk-in patients resulted in build-up of patients during peak-times (11am - 3pm) this contributed to 23% drop in time for patient work-up, 39% drop in patient-doctor time, and 16% increase in cross-referrals for patients. To compensate the staff worked 24% over their allotted hours. In Santiago, Chile working with urban logistics carriers, we found that the institutional knowledge of drivers plays a key role in understanding and building delivery routes. Only 53% of the drivers adhered to the "optimized" route provided to them by the dispatcher. Traffic congestion, delays at customer sites, familiarity with the customer, and on-site parking led to drivers making decisions that best suited their needs. At the Roskilde Music Festival experiment, we use crowdsourcing to collect data incidents that go unreported at a large gathering. We learned about the close social ties that develop due to the shared experience of festival attendees and the need to preserve privacy and security of users in a platform like ours. Finally we propose a refined model of Kaizen strategy incorporating a "living lab" approach to managing socio-technical systems. We portray a world where socio-technical systems are continuously evolving using the bytes of data collected from an open innovation ecosystem.
by Ali S. Kamil.
S.M. in Engineering and Management

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Teh, Peh Chiong. "Applications of superstructure fibre Bragg gratings for optical code division multiple access and packet switched networks." Thesis, University of Southampton, 2003. https://eprints.soton.ac.uk/46105/.

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This thesis describes the research on the implementation of all-optical code generation and recognition based on superstructure fibre Bragg grating (SSFBG) for use in Optical Code Division Multiple Access (OCDMA) systems and also in high-speed all-optical packet switched networks.These results highlight the precision and flexibility of the continuous grating writing process and show that the SSFBG technology represents a promising technology not just for OCDMA but an extended range of other pulse shaping, and associated optical processing applications such as required within optical packet switched networks

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Konefal, Joseph G. "Applying factory physics to manual assembly at an aerospace fabrication site." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111515.

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Thesis: M.B.A., Massachusetts Institute of Technology, Sloan School of Management, in conjunction with the Leaders for Global Operations Program at MIT, 2017.
Thesis: S.M. in Engineering Systems, Massachusetts Institute of Technology, School of Engineering, Institute for Data, Systems, and Society, in conjunction with the Leaders for Global Operations Program at MIT, 2017.
Cataloged from PDF version of thesis.
Includes bibliographical references (page 63).
The assembly of welded reservoirs at the Boeing Tube Duct, and Reservoir Center (TDRC) is a traditional batch and queue operation that relies heavily on manual craftsmanship. The production system experiences high variability in cycle times, high use of overtime, and poor ontime performance. The value provided by the system to Boeing and its customers is characterized by considering the associated costs of late delivery, inventory, labor, and opportunity cost. To understand the system's performance, the system's processes are mapped and modeled using discrete event simulation. The simulation is used to evaluate the benefits of changes to staffing, overtime implementation, and shop floor control. Based on the results of the simulation, lead times are increased to stabilize delivery and a CONWIP system is implemented to improve productivity and reduce overtime costs. Subsequent production data show that these changes are effective and that this framework provides successful strategies for value characterization, system stabilization, cost reduction, and increases in value creation.
by Joseph G. Konefal.
M.B.A.
S.M. in Engineering Systems

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Tian, Chun. "Investigation of code reconfigurable fibre Bragg gratings for Optical Code Division Multiple Access (OCDMA) and Optical Packet Switching (OPS) networks." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/70909/.

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This thesis documents my work in the telecommunication system laboratory at the Optoelectronics Research Centre, towards the implementation of code reconfigurable OCDMA and all-optical packet switching nodes based on fibre Bragg grating (FBG) technology. My research work involves characterizing the performance of various gratings, specifically high reflectivity, short chip duration, long code sequences, multiple phase level and tunable superstructured fiber Bragg gratings (SSFBGs), by using the recently proposed Frequency-Resolved Optical Gating technique based on Electro-Absorption Modulator (EAM-FROG). This technology can obtain the complex code profile along the grating, making it a powerful method to understand the thermally-induced code-reconfigurable grating. Efforts have been made to improve the grating design to achieve better system performance. Three different types of FBGs optical encoder/decoder, e.g. conventional discrete phaseshift SSFBGs, code-reconfigurable gratings, and novel continuous phase-shift SSFBGs, have been investigated comparatively, as well as their performance in various optical coding/decoding systems. This thesis also discusses the possibility of reducing multiple access interference (MAI) using a Two-Photon Absorption (TPA) process. The advanced grating devices enable the improvement of system performance. A dynamically reconfigurable optical packet processing system and a 16-channel reconfigurable OCDMA/DWDM system with 50GHz DWDM intervals has been demonstrated. These results highlight the feasibility of FBG-based optical coding/decoding techniques, with improved system flexibility and sustainability.

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Pittman, Gell Tiger Lee. "Simulation of an orthogonal frequency division multiplexing based underwater communication system using a physics based model for the underwater acoustic sound channel." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2001. http://handle.dtic.mil/100.2/ADA397494.

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Thesis (M.S. in Engineeirng Science (Major in Electrical Engineering))--Naval Postgraduate School, Sept. 2001.
Thesis advisors, Cristi, Roberto ; Smith, Kevin B. "September 2001." Includes bibliographical references (p. 185-186). Also available in print.

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Wollrab, Viktoria. "Active gels in vivo : patterns and dynamics in cytokinetic rings and their functions in cell division." Thesis, Strasbourg, 2014. http://www.theses.fr/2014STRAF027/document.

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Les structures d'acto-myosine sont impliquées dans de nombreuses fonctions cellulaires. Comprendre leur organisation et leur comportement collectif est toujours difficile. Nous avons étudié l'anneau cytokinétique dans les cellules de mammifères et dans les levures de fission, en orientant les cellules dans les microcavités, ce qui permet de voir l'anneau dans un seul plan focal. Avec cette configuration, nous révélons de nouvelles structures et des dynamiques distinctes pour les deux systèmes cellulaires. Dans les cellules de mammifères, nous trouvons des motifs réguliers de la myosine et la formine. Les caractéristiques de ces motifs sont stables tout au long de sa fermeture et leur apparition coïncide avec la constriction. Nous proposons que ce phénomène est une propriété inhérente du réseau d'acto-myosine et que la formation de ces motifs entraîne une augmentation du stress. Ces hypothèses sont confirmées par notre modèle en champ moyen. Par contraste, l'anneau de levure de fission montre des inhomogénéités tournantes de l'actine, de la myosine, des protéines de la construction de la paroi (Bgs) et d'autres protéines. La dynamique des inhomogénéités de myosine est inchangée, si la croissance de la paroi est inhibée. Cependant, l'inhibition du mouvement des inhomogénéités conduit à l'arrêt de la fermeture. Nous proposons que la fermeture de l'anneau est entraînée par la rotation de l'actine et de la myosine qui tirent des protéines Bgs, lesquelles construisent ainsi le septum. Cette hypothèse est confirmée par nos calculs et par des simulations numériques. Nous suggérons que la transition entre les états de différents ordres et dynamiques pourrait être une façon de réguler in vivo les systèmes d'acto-myosine
Actomyosin structures are involved in many cell functions. Understanding their organization and collective behavior is still challenging. We study the cytokinetic ring in mammalian cells and in fission yeasts, by orienting cells in microcavities. This allows seeing the ring in a single plane of focus. With this setup, we reveal new structures and distinct dynamics for both cellular systems. In mammalian cells we find a pattern of regular clusters of myosin and formin. The characteristics of this pattern are stable throughout closure and its formation coincides with the onset of constriction. We propose that its characteristic is an inherent property of the actomyosin network and that its formation leads to an increase in stress generation. These hypotheses are supported by our theoretical mean field model. In contrast, fission yeast rings show rotating inhomogeneities (speckles), i.e. rotations of actin, myosin, cell wall building proteins (Bgs) and other proteins. Myosin speckles dynamic is unchanged, if wall growth is inhibited. However, the inhibition of speckle motion leads to stalled closure. We propose that the ring closure is driven by the rotation of actin and myosin, which pull Bgs thereby building the septum. This model is supported by our calculations and by numerical simulations. We suggest that the transition between states of different orders and dynamics might be a way to regulate actomyosin systems in vivo

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Gray, Martha Lane. "Physical regulation of epiphyseal cartilage biosynthesis : responses to electrical, mechanical, and chemical signals." Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/17205.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Harvard-MIT Division of Health Sciences and Technology Program in Medical Engineering and Medical Physics, 1986.
MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE.
Bibliography: leaves 194-205.
by Martha Lane Gray.
Ph.D.

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Théry, Manuel. "Contrôle de la polarité des cellules adhérentes : utilisation de micro-patrons adhésifs pour la manipulation de l'architecture cellulaire et l'analyse quantitative de l'organisation des cellules en interphase et en mitose." Phd thesis, Université Paris-Diderot - Paris VII, 2006. http://tel.archives-ouvertes.fr/tel-00012058.

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Les travaux effectués au cours de cette thèse et présentés dans ce manuscrit consistent en l'utilisation de micro-patrons adhésifs pour l'étude de l'organisation spatiale des organites intracellulaires. Nous avions comme modèle de travail la compartimentation et la polarisation des cellules au sein des tissus. Dans cette situation, les cellules n'adhèrent pas de façon homogène et isotrope à leur environnement. Au contraire, elles s'attachent à leur voisines et à la matrice extracellulaire, en des endroits particuliers, grâce à des complexes transmembranaires, les adhésions. Ces adhésions sont une des bases structurales de la construction du cytosquelette. Leur distribution spatiale peut être anisotrope, et parfois asymétrique, ce qui guide la polarité intrinsèque des cellules.
Nous avons utilisé la technique d'impression par micro-contact pour manipuler la forme des cellules et la distribution de leurs adhésions. Les cellules adoptent l'enveloppe convexe du patron adhésif quelle que soit sa géométrie. Si, par exemple, les cellules sont contraintes de s'attacher à un T ou un V, sans pouvoir établir de contact en dehors de ce patron, elles adopteront dans les deux cas la même forme triangulaire. Nous avons utilisé cette propriété pour imposer aux cellules des formes identiques sur des patrons adhésifs différents afin d'analyser le rôle spécifique de la distribution des adhésions sur l'organisation du cytosquelette et des compartiments intracellulaires.
Nos mesures montrent que les cellules développent des tensions élevées dans les filaments d'actine, assemblés en fibres de stress, au-dessus des zones non adhésives. Sur les zones adhésives, la tension est plus faible, et la polymérisation de l'actine en un réseau branché induit la formation de protrusions membranaires. La localisation des protrusions est donc complémentaire de celle des zones contractiles.
Cette polarisation du système actine dirige le recrutement de certaines protéines dont l'activité influence la dynamique des microtubules. La croissance des microtubules en contact avec le cortex cellulaire est modulée différemment selon que l'actine forme des fibres de stress ou un réseau branché. Cependant, quel que soit le comportement des extrémités du réseau de microtubules à la périphérie, le centre du réseau, le centrosome, se maintient toujours au centre de la cellule. Le noyau est exclu de ce centre et se positionne vers les zones de contraction. Ainsi, à l'intérieur de la cellule, l'orientation de l'axe noyau-centrosome répond à l'asymétrie établie en périphérie.
La polarité du cortex est conservée pendant la division cellulaire ou mitose. Le corps cellulaire, qui s'est arrondi à l'entrée en mitose, est maintenu en contact avec le substrat adhésif par des fibres de rétraction riches en actine. Les mesures expérimentales de l'orientation des divisions, sur différents patrons adhésifs, révèlent que la distribution spatiale des ancrages de ces fibres sur la cellule guide l'orientation du fuseau mitotique, et par conséquent, le plan de division des cellules. En effet, les pôles du fuseau se positionnent en face des zones corticales où sont arrimées les fibres de rétraction, indépendamment de la forme qu'avait la cellule avant l'entrée en mitose.
Il existe des moteurs moléculaires ancrés dans le cortex des cellules et capables de tirer sur les microtubules astraux émanant des pôles du fuseau. En faisant l'hypothèse que ces moteurs ne sont activés que dans les zones où se situent les fibres de rétraction, on peut établir un modèle physique permettant de rendre compte de toutes les observations expérimentales effectuées.

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18

Klostermann, Ulrich. "Submicrometer sized magnetic tunnel junctions : dissertation submitted in the requirement for the degree of doctor natural sciences in physics in the graduate division of the university of Regensburg, 2001 /." Berlin : Logos-verl, 2002. http://catalogue.bnf.fr/ark:/12148/cb39077330h.

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19

Farlow, Brian. "Square Peg Thinking, Round Hole Problems: An Investigation of Student Thinking About and Mathematical Preparation for Vector Concepts in Cartesian and Non-Cartesian Coordinates Used in Upper-Division Physics." Diss., North Dakota State University, 2019. https://hdl.handle.net/10365/31479.

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20

Smith, Joseph Martin. "The stochastic nature of cardiac electrical instability : theory and experiment." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/14339.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Harvard-MIT Division of Health Sciences and Technology, 1986.
Vita.
Includes bibliographical references (leaves 190-206).
by Joseph Martin Smith.
Ph.D.

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21

Stearns, Charles William. "Accelerated image reconstruction for a cylindrical positron tomograph using Fourier domain methods." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/29201.

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Thesis (Ph. D.)--Harvard University--Massachusetts Institute of Technology Division of Health Sciences and Technology, Program in Medical Engineering and Medical Physics, 1990.
Includes bibliographical references (leaves 142-150).
by Charles William Stearns.
Ph.D.

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22

Lotz, Jeffrey Charles. "Hip fracture risk predictions by x-ray computed tomography." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14410.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Harvard-MIT Division of Health Sciences and Technology Program in Medical Engineering and Medical Physics, 1988.
Includes bibliographical references.
by Jeffrey Charles Lotz.
Ph.D.

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23

Albrecht, Paul 1956. "Stochastic characterization of chronic ventricular ectopic activity." Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/29514.

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Thesis (Ph.D.)--Harvard-Massachusetts Institute of Technology Division of Health Science and Technology Program in Medical Engineering and Medical Physics, 1986.
MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE.
Bibliography: leaves 277-289.
by Paul Albrecht.
Ph.D.

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24

Ladin, Zvi. "Set-theoretic analysis of multi-link systems with applications to gait." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/17201.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Harvard-MIT Division of Health Sciences and Technology Program in Medical Engineering and Medical Physics, 1985.
MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE.
Bibliography: leaves 163-169.
by Zvi Ladin.
Ph.D.

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25

Burstein, Deborah. "NMR studies of intracellular sodium in the perfused frog heart." Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/17203.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Harvard-MIT Division of Health Sciences and Technology Program in Medical Engineering and Medical Physics, 1986.
MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE.
Bibliography: leaves 140-153.
by Deborah Burstein.
Ph.D.

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26

Chernoff, Daniel Michael. "Kinetics of local anesthetic binding to sodium channels : role of pKaÌ³." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/29203.

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Thesis (Ph. D.)--Harvard University--Massachusetts Institute of Technology Division of Health Sciences and Technology, Program in Medical Engineering and Medical Physics, 1989.
On t.p. "a" is subscript.
Includes bibliographical references (leaves 165-175).
by Daniel Michael Chernoff.
Ph.D.

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27

Walsh, Joseph Tonry. "Pulsed laser ablation of tissue : analysis of the removal process and tissue healing." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14412.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Harvard-MIT Division of Health Sciences and Technology Program in Medical Engineering and Medical Physics, 1988.
Includes bibliographical references.
by Joseph T. Walsh, Jr.
Ph.D.

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Wodicka, George R. "Acoustic transmission in the respiratory system." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/29200.

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Thesis (Ph. D.)--Harvard University--Massachusetts Institute of Technology MIT Division of Health Sciences and Technology, Program in Medical Engineering and Medical Physics, 1989.
Vita.
Includes bibliographical references (leaves 161-163).
by George Robert Wodicka.
Ph.D.

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29

Prince, Martin Raymond. "Selective laser ablation of diseased tissue : investigations on a safe method of opening occluded arteries." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14411.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Harvard-MIT Division of Health Sciences and Technology Program in Medical Engineering and Medical Physics, 1988.
Includes bibliographical references.
by Martin R. Prince.
Ph.D.

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Saltzman, William Mark. "A microstructural approach for modelling diffusion of bioactive macromolecules in porous polymers." Thesis, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/14625.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Harvard-MIT Division of Health Sciences and Technology Program in Medical Engineering and Medical Physics, 1987.
Bibliography: v. 2, leaves 335-343.
by William Mark Saltzman.
Ph.D.

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31

McFarland, Eric W. (Eric Wesley). "Nuclear spin transfer studies of chemical reactions in living systems." Thesis, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/17215.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Harvard-MIT Division of Health Sciences and Technology Program in Medical Engineering and Medical Physics, 1987.
Bibliography: leaves 212-227.
by Eric W. McFarland.
Ph.D.

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32

Carley, David William. "The stability of respiratory control in man : mathematical and experimental analyses." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/17192.

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Thesis (Ph. D.)--M.I.T., Harvard-MIT Division of Health Sciences and Technology Program in Medical Engineering and Medical Physics, 1985.
MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIECNE.
Vita.
Includes bibliographical references.
by David William Carley.
Ph.D.

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33

Cheal, Edward John. "Trabecular bone remodeling around implants." Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/17204.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Harvard-MIT Division of Health Sciences and Technology Program in Medical Engineering and Medical Physics, 1986.
MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE.
Bibliography: p. 332-347.
by Edward John Cheal.
Ph.D.

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34

Chueh, Henry C. "Integration of expert knowledge into computer-controlled databases in the medical domain : HEMAVID, a case study." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/29202.

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Thesis (M.S.)--Harvard University--Massachusetts Institute of Technology Division of Health Sciences and Technology, Program in Medical Engineering and Medical Physics, 1989.
Includes bibliographical references (leaves [165]-[172]).
by Henry C. Chueh.
M.S.

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35

Toner, Mehmet. "Thermodynamics and kinetics of ice nucleation inside biological cells during freezing : as applied to mouse oocytes." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/29199.

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Thesis (Ph. D.)--Harvard University--Massachusetts Institute of Technology Division of Health Sciences and Technology, Program in Medical Engineering and Medical Physics, 1989.
Includes bibliographical references (leaves 372-393).
by Mehmet Toner.
Ph.D.

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36

Powell, Kevin. "Mammalian cell clonal growth and secretion measurements using gel microdroplets and flow cytometry." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/29198.

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Thesis (Ph. D.)--Harvard University--Massachusetts Institute of Technology Division of Health Sciences and Technology, Program in Medical Engineering and Medical Physics, 1989.
Includes bibliographical references (leaves 94-98).
by Kevin Thomas Powell.
Ph.D.

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Valor, Sabatier Josep. "Mathematical tools and budgetary mechanisms for hospital cost control." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/29513.

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Thesis (Sc. D.)--Harvard--Massachusetts Institute of Technology Division of Health Sciences and Technology Program in Medical Engineering and Medical Physics, 1985.
MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE
Bibliography: leaves 140-146.
by Josep Valor Sabatier.
Sc.D.

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38

Sung, Cynthia. "A study of polyethylene oxide-polysiloxane networks as biomaterials for drug release." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14501.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Harvard-MIT Division of Health Sciences and Technology Program in Medical Engineering and Medical Physics, 1989.
Includes bibliographical references.
by Cynthia Sung.
Ph.D.

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39

Allbritton, Nancy L. (Nancy Lynn). "The role of calcium in the destruction of target cells by cytotoxic T cells." Thesis, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/29517.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Harvard-MIT Divison of Health Sciences and Technology Program in Medical Engineering and Medical Physics, 1987.
Title as it appears in M.I.T. Graduate List, June 1987: The role of calcium in the destruction of target cells by cytotoxic T lymphocytes.
Bibliography: leaves 224-239.
by Nancy L. Allbritton.
Ph.D.

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40

Sciumè, Giuseppe. "Modèle thermo-hydro-chemo-mécanique du béton au jeune âge et son adaptation pour l'analyse numérique de la croissance des tumeurs cancéreuses." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2013. http://tel.archives-ouvertes.fr/tel-00804061.

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L'objectif du travail de thèse a été la mise en place de deux modélisations multi-physiques fondées sur des fondements théoriques communs mais appliquées à deux domaines de la recherche scientifique très différents: i) l'étude du comportement du béton au jeune âge pour la prévention de la fissuration précoce; ii) l'analyse des phénomènes physiques, chimiques et biologiques qui gouvernent la croissance et l'évolution de la tumeur cancéreuse. Le développement d'un outil numérique pour la modélisation du béton au jeune âge est très important pour la conception de structures durables. Le modèle développé pendant la thèse doctorale a été implanté sur le code aux éléments finis Cast3M, puis validé expérimentalement. Il permet de multiples applications: étude des sollicitations et des phénomènes de fissuration au jeune âge, gradients thermiques et hydriques, prédiction du retrait endogène et de dessiccation, étude de l'inhibition de l'hydratation causée par le séchage, prédiction du fluage et de la redistribution des contraintes associées, étude des réparations. Les équations qui gouvernent le comportement thermo-hydro-chemo-mécanique du béton au jeune âge ont plusieurs analogies formelles avec celles qui sont typiquement à la base de la modélisation de la croissance des tumeurs cancéreuses. L'élargissement de l'analyse numérique dans le domaine médical est d'un grand intérêt social en complément de l'intérêt scientifique. Les équations utilisées pour le béton ont été réadaptées, et le modèle mathématique obtenu a été implanté dans Cast3M. Les premiers résultats du modèle ont été satisfaisants et qualitativement très proches des données expérimentales de la littérature dans ce domaine.

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41

Petty, Brandy A. "Utilization of emergency policies and procedures by Division I-A and Division I-AA intercollegiate athletic programs." Huntington, WV : [Marshall University Libraries], 2003. http://www.marshall.edu/etd/descript.asp?ref=237.

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42

Inaba, Tatsuya 1967. "An analysis of physical object information flow within Auto-ID infrastructure." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/29526.

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Thesis (M. Eng. in Logistics)--Massachusetts Institute of Technology, Engineering Systems Division, 2004.
"June 2004."
Includes bibliographical references (leaves 69-71).
The application of Radio Frequency Identification (RFID) has been studied for decades, and many field trials have been executed to evaluate the usability of RFID systems, the business case of RFID applications and so forth. One of the trial fields is its application to supply chain management (SCM) because the RFID technologies are thought to improve visibility of physical objects dramatically. Through this trial phase, benefits and feasibility of RFID have been confirmed, and as a result, major retailers, such as Wal-Mart, Target, and Metro, have decided to implement RFID. At the same time, these trials reveal the necessity of RFID standards. Among these newly developed RFID standards, Auto-ID standard, which was originally developed by Auto-ID Center, is a strong candidate to be a de-facto standard. Auto-ID technologies consist of data standards and software architecture components. Data standards also consist of two components: Electronic Product Code (EPC) and Physical Markup Language (PML). On the other hand, software architecture components consist of four components: readers, Savant, EPC Information Server (EPC-IS), and Object Name Service (ONS). EPC-IS. which defines the interface of the servers that store physical object information, plays a key role in realizing business processes that the RFID technologies are expected to realize. In this thesis, we propose architecture of EPC-IS by defining the requirements for EPC-IS through generic business processes executed in Auto-ID infrastructure. The architecture we propose is not a monolithic message schema but three simple message schemas with vocabulary sets that are separately defined in dictionaries. By taking this structure, we achieve robust and scalable interface. We also evaluate
our proposal by applying it to the problems found in the RFID trials and possible future business processes.
by Tatsuya Inaba.
M.Eng.in Logistics

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43

Sinha, Kaushik Ph D. Massachusetts Institute of Technology. "Structural complexity and its implications for design of cyber-physical systems." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/89871.

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Thesis: Ph. D., Massachusetts Institute of Technology, Engineering Systems Division, 2014.
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.
Most modern era software-enabled, electro-mechanical systems are becoming more complex as we demand more performance and better lifecycle properties (e.g. robustness) from them. As a consequence system development projects are becoming increasingly challenging and are falling behind in terms of schedule and cost performance. The complexity of technical systems depends on the quantity of different elements and their connectivity, i.e., complexity means a measurable system characteristic. There are three main dimensions of complexity that emerged in the context of system design and development: (1) Structural Complexity; (2) Dynamic Complexity and (3) Organizational Complexity. Structural complexity pertains to the underlying system architecture or more generally, the enabling infrastructure. Dynamic complexity refers to the complexity of the system behavior or process running on the underlying infrastructure. Organizational Complexity relates to the system development process and the organizational structure of the development team. This dissertation primarily focuses on developing a theoretical framework for structural complexity quantification of engineered systems and subsequently a complexity-based design paradigm of interconnected, complex engineered system. There are four distinct thematic parts in this dissertation: (i) theoretical development of the proposed structural complexity metric, including the metric's qualification as a valid complexity measure based on its mathematical properties; (ii) empirical validation of the proposed complexity metric based on simple experiments and application of the methodology to compute structural complexity of complex engineered systems like jet engines and advanced printing systems; (iii) systemic implications from a complexity management standpoint, including introduction of complexity budgeting for system development and linking actual complexity to human perception of complexity through the notion of complicatedness, and (iv) extension of the proposed metric to system-of-systems and a computational framework for measuring dynamic complexity. The topological complexity metric, C₃ is shown to clearly distinguish between system architectural regimes (e.g., centralized, hierarchical, transitional and distributed). The ball and stick experiment empirically establishes the super-linear relationship between structural complexity (X) and development effort (Y) with exponent, b=1.48.
by Kaushik Sinha.
Ph. D.

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44

Schmidt, Mischa [Verfasser], and Peter [Akademischer Betreuer] Lenz. "Physical aspects of bacterial cell division / Mischa Schmidt. Betreuer: Peter Lenz." Marburg : Philipps-Universität Marburg, 2011. http://d-nb.info/1013255763/34.

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45

Spalding, Joanne. "Technical and Physical Match Demands of a NCAA Division I Soccer Goalkeeper." Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etd/3176.

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The purpose of this study was to provide a better understanding of the goalkeeper position in order to prepare goalkeepers for competition. The objectives of this study were to characterize the technical and physical demands of an NCAA Division I collegiate goalkeeper over three seasons and examine trends from season to season. Count and frequency for each definition were analyzed. Results show that although the goalkeeper’s technical demands were characterized by engaging in play without action and being in the goal area, the gradually increased use of the feet over three season’s hints on the importance of skills performed with the lower body. Findings suggest that most shots faced by the goalkeeper were from direct attacks, outside the box and from central positions. Foot skills may be relied on with increasing experience. Over the course of three seasons, forward and lateral movements were the most common and second most common.

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46

Treppo, Steven. "Physical diagnostics of cartilage degeneration." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/85263.

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Thesis (Ph.D.)--Harvard--Massachusetts Institute of Technology Division of Health Sciences and Technology, February 1999.
"January 1999."
Includes bibliographical references (leaves 219-239).
by Steven Treppo.
Ph.D.

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47

Sausaman, Robert W. "Exploring the Match Demands of Division I Women’s Collegiate Soccer." Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/etd/3599.

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The purpose of this dissertation is to shed light on the physical demands of women’s soccer at the NCAA division I college level. Though research does exists describing the physical demands of women’s soccer, the vast majority seeks to explain the physical demands association with the professional and international level. This dissertation sought to: 1) examine the physical demands of NCAA division I women’s soccer and 2) observe changes in physical demands of two NCAA division I women’s soccer players over a four-year career using a case study approach. Study 1 examined the physical demands of twenty-three athlete from a single NCAA division I team using Global Positioning System devices during four competitive seasons. Total distance, high-speed running distance and sprinting distances were analyzed for comparison against previously established physical demands associated with higher standards of play as well as for positional differences. Differences were found regarding total distance covered between standards of play. However, more pronounced differences were identified between high-speed running activities and standard of play, with higher standards requiring greater demands for high-intensity activities. Additionally, attacking players were demonstrated to cover greater total distance and high-intensity distance compared to the other position groups. Study 2 was a case study, observing seasonal variation in match physical demands of two high-level collegiate players during their 4-four college careers. Each player was tracked using GPS devices to record total distance, high-speed running distance and sprint distance. Seasonal variation in physical demands were found for each player, however, no consistent trends were found for both players. Interestingly, lower physical demands were identified during each player’s final season of play in comparison to all previous seasons, possibly demonstrating an increased tactical awareness resulting in improved playing efficiency. Nevertheless, future examination including additional data such as fitness testing results, tactical formations, and technical skill assessment are warranted. With little research available detailing the physical demands of women’s soccer at the division I collegiate level, our findings will provide further insight into the physical demands required for division I female players. By understanding the specific physical demands associated with competitive matches, as well as various positions, coaches and sports scientists can be equipped with objective data unique to women’s college soccer at the NCAA division I level. Our findings will empower practitioners with valuable information necessary to guide more informed decision making with regard to training structure and prescription, to enhance performance and minimize injury risks.

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48

Pelegrina, Bonilla Gabriel [Verfasser]. "Asymmetric fused fiber couplers for wavelength- and space-division multiplexing / Gabriel Pelegrina Bonilla." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2015. http://d-nb.info/1077017774/34.

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Dandekar, Kapil Ramesh. "Space division multiple access systems : computational electromagnetic studies of the physical and network layers /." Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3008307.

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Al-Juboori, Ghaith Radhi Hassan. "Generalised frequency division multiplexing as a physical layer waveform candidate for 5G and beyond." Thesis, University of Bristol, 2018. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.752774.

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Dissertations / Theses on the topic 'Division of Physics'

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