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Dissertations / Theses on the topic 'Elastic cord'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Kolesova, A. V. "Bungee jumping-technology for the bravest." Thesis, Sumy State University, 2014. http://essuir.sumdu.edu.ua/handle/123456789/45603.

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Bungee jumping is an activity that involves jumping from a tall structure while connected to a large elastic cord. The tall structure is usually a fixed object, such as a building, bridge or crane; but it is also possible to jump from a movable object, such as a hot-air-balloon or helicopter, that has the ability to hover above the ground. The thrill comes from the free-falling and the rebound. When the person jumps, the cord stretches and the jumper flies upwards again as the cord recoils, and continues to oscillate up and down until all the kinetic energy is dissipated.

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2

Ramos, Helena Hotz Arroyo. "Estudo histológico dos efeitos agudos de lesão com laser de diodo 980 nm em pregas vocais de coelhos." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/5/5143/tde-09052018-090014/.

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INTRODUÇÃO: A cicatriz em prega vocal que ocorre após injúria constitui causa importante de disfonia. A fonocirurgia ideal é aquela em que a lesão efetivamente removida com o menor dano possível ao tecido adjacente, a fim de reestabelecer a função da prega vocal ao mesmo tempo em que a sua ultraestrutura sua ultraestrutura é preservada. Tanto o bisturi frio quanto lasers em geral são aceitos como instrumentos para fonocirurgia. O laser de diodo tem sido usado no tratamento de doenças laríngeas. Entretanto, não há consenso quanto os parâmetros ideais desse aparelho para tal finalidade. Inexiste

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3

鄺君尚 and Jun-shang Kuang. "Elastic and elasto-plastic analysis of shear wall and core wall structures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1988. http://hub.hku.hk/bib/B3123155X.

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4

Kuang, Jun-shang. "Elastic and elasto-plastic analysis of shear wall and core wall structures /." [Hong Kong] : University of Hong Kong, 1988. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12428565.

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5

Zhang, Jin. "Elastic/plastic buckling of cylindrical shells with elastic core under axial compression." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66952.

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Elastic as well as plastic buckling of circular cylindrical shells filled with a core material is analyzed under axial compressive loading. A practical example of this situation is the buckling of concrete filled steel tubular (CFT) columns used widely in high-rise buildings. The theoretical problem is modeled as the bifurcation buckling of a perfect "infinitely" long circular cylindrical shell under uniform compression, constrained by a one-way (tension-less) foundation. An important and useful novelty is that the shell material is allowed to undergo strain-hardening plastic

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6

Breuer, John. "Cold elastic collisions of sodium and rubidium." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29690.

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Thesis (M. S.)--Physics, Georgia Institute of Technology, 2010.<br>Committee Chair: Kennedy, Brian; Committee Member: Chapman, Michael; Committee Member: Zangwill, Andrew. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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7

Liu, Harry. "Elastic properties and phases of bent core liquid crystal." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/elastic-properties-and-phases-of-bent-core-liquid-crystal(1428e685-754c-42c0-890b-9ae83f0b5f7c).html.

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The recent interest in bent core liquid crystal has shown many unique physical properties, such the anomalous behaviour of the elastic constants (SplayK1, Twist K2, and BendK3). In bent core liquid crystals it is observed that K3K1). Such behaviour is analogous to calamitic liquid crystals but is in contrast to all other bent-core nematic materials reported to date. Such a result questions some of the current explanations for the elastic behaviour of bent-core materials. Using molecular field theory and atomistic modelling the different elastic behaviour predicted is again in excellent agreeme

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8

Tian, Biyu. "Numerical simulation of elastic wave propagation in honeycomb core sandwich plates." Phd thesis, Ecole Centrale Paris, 2012. http://tel.archives-ouvertes.fr/tel-01064030.

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Honeycomb core sandwich panels are widely used in the aeronautic industry due to their excellent flexural stiffness to weight ratio. Generally, classical homogenized model is used to model honeycomb core sandwiches in order to have an efficient but not expensive numerical modeling. However, previous works have shown that, while the homogenized models could correctly represent the membrane waves' behavior of sandwiches in a large frequency range, they could not give satisfying simulation results for the flexural waves' behavior in the high frequency range (HF). In fact, the honeycomb core layer

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9

Smith, Brennan M. "Functionality of corn and sorghum proteins in visco-elastic dough systems." Diss., Kansas State University, 2012. http://hdl.handle.net/2097/13655.

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Doctor of Philosophy<br>Food Science Institute<br>Fadi Aramouni<br>Scott Bean<br>Zein, the storage protein of corn, has been shown to form a wheat-like dough; however the exact mechanism is unknown since zein lacks the large polymeric proteins found in wheat. To understand how zein forms a dough, different reagents were added during mixing of zein. Salts from the Hofmeister series were used to determine how hydrophobic interactions influence zein’s dough forming ability. In addition, urea, ethanol, and beta mercaptoethanol (β-ME) were also tested to evaluate the effects of protein denaturatio

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10

Spillmann, Jonas. "CORDE: Cosserat rod elements for the animation of interacting elastic rods." [S.l. : s.n.], 2008. http://nbn-resolving.de/urn:nbn:de:bsz:25-opus-57751.

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11

Dewaidi, Mohaned Ali. "Design Method for Cold-Formed Steel Shear Wall Sheathed with Polymer Composite Panel." Thesis, University of North Texas, 2020. https://digital.library.unt.edu/ark:/67531/metadc1707373/.

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In order to predict the strength of shear wall with cold-formed steel framing members, analytical models were reviewed. Multiple analytical models were studied, as well as twenty-one connection tests were performed. The connection tests consist of 50-ksi cold-formed steel framing track, different fastening configurations, and different sheathing thicknesses (1/8" and 1/2"). No.12 screw resulted in the highest peak load of all fastening configurations, while the rivet connection had the lowest peak load. In addition, failure modes were observed after conducting the connection tests including sh

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12

Kargén, Ulf. "First-Principles Study of Elastic Properties of Fe-Mg alloy at Earth’s core pressure." Thesis, Linköping University, The Department of Physics, Chemistry and Biology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-15742.

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<p>The purpose of this thesis has been to investigate the elastic properties of an fcc FeMg alloy with 10 at.% magnesium under high pressure. Recent research has shown that magnesium can be a possible candidate for light element impurities in the Earth’s inner core, something that was previously not considered possible because of the low miscibility of magnesium in iron at ambient pressure. Gaining knowledge about the composition of the Earth’s core can help us better understand such phenomena as seismic activity and the fluctuations of the Earth’s magnetic field.</p><p>The elastic constants o

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13

Soroori, Rad Behrooz H. "Experiments on Cold-Formed Steel Beams with Holes." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/42698.

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Experimental testing and elastic buckling studies were performed on 68 C-section cold-formed steel joists with unstiffened rectangular web holes. Four Steel Stud Manufacturers Association (SSMA) cross-section types; 800S200-33, 800S200-43, 1000S162-54, and 1200S162-97, were evaluated to explore the influence of holes on local, distortional, and global bucking failure modes. Hole depth was varied in the tests to identify trends in ultimate strength. Ultimate strength was observed to decrease with increasing hole depth for 800S200-33, 1200S162-97 cross-sections. Due to small number of specimen

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14

Гребенюк, Сергій Миколайович, Сергей Николаевич Гребенюк та Sergii M. Grebeniuk. "Напружено-деформований стан просторових конструкцій на основі гомогенізації волокнистих композитів". Thesis, Запорізький національний технічний університет, 2016. http://eir.zntu.edu.ua/handle/123456789/1212.

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Гребенюк, С. М. Напружено-деформований стан просторових конструкцій на основі гомогенізації пружних сталих волокнистих композитів [Текст]: дис. … д-ра тех. наук: 01.02.04 /Гребенюк Сергій Миколайович. – Запоріжжя, 2016. – 319 с.<br>UK: На основі аналітичних розв’язків методом представницького об’ємного елемента отримані співвідношення для ефективних пружних сталих композита з транстропними матрицею і волокном. Побудована матриця жорсткості паралелепіпедного скінченного елемента на основі моментної схеми, яка враховує особливості просторової орієнтації волокон. Описано підхід до розв’язку гео

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15

Overfield, Bethany L. "A CLASSIFICATION OF LOWER PALEOZOIC CARBONATE-BEARING ROCKS FOR GEOTECHNICAL APPLICATIONS." UKnowledge, 2011. http://uknowledge.uky.edu/gradschool_theses/127.

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An empirically-based classification of lower Paleozoic carbonate-bearing rocks was created for field-based geotechnical applications. Geotechnical parameters were subsequently correlated to that classification. Seven hundred seventy-seven samples were used as the basis for the classification. Thirteen categories based on visual and tactile properties and a hydrochloric acid test were created. Samples were from central, north-central, and south-central Kentucky and represented the majority of Ordovician exposures in the state, and some Mississippian exposures. Few Silurian and Devonian units we

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16

Michalička, Jan. "Lomová houževnatost kompozitu s Al-matricí a uhlíkovými vlákny." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228117.

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Abstract The objective of this study was a values evaluation of fracture toughness of fiber-metal laminates (FML) compounded from carbon fibers in epoxy matrix and aluminium plates of lay-up 6/5. Samples with unidirectional and bidirectional orientation were tested experimentally. In the case of unidirectionally oriented samples an effect of moisture absorption to epoxy matrix on the values of fracture toughness was reviewed. A fracture toughness calculation was realized by COD method firstly. A bigger pop-ins in F – COD diagram as critical moments for "delta"c evaluation were considered; it w

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17

Richards, Gregory P. "Macroscopic Modeling of the Smectic-CG Phase Formed By Bent-Core Liquid Crystals." Kent State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=kent1271685708.

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18

Jefferson, David. "The elasto-plastic localised buckling behaviour of cold-formed sections." Thesis, Oxford Brookes University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328301.

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19

Rivera, Alejandro. "Non-Linear Finite Element Method Simulation and Modeling of the Cold and Hot Rolling Processes." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/31035.

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A nonlinear finite element model of the hot and cold rolling processes has been developed for flat rolling stock with rectangular cross section. This model can be used to analyze the flat rolling of cold and hot steel rectangular strips under a series of different parameters, providing the rolling designer with a tool that he can use to understand the behavior of the steel as it flows through the different passes. The models developed, take into account all of the non-linearities present in the rolling problem: material, geometric, boundary, and heat transfer. A coupled thermal-mechanical

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20

PASI, MARCO. "A dynamical perspective on cold-adapted enzymes at the molecolar level." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2009. http://hdl.handle.net/10281/7729.

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Some organisms, especially unicellular, have adapted to extreme temperature conditions, and are capable of proliferating in such environments mainly thanks to the optimisation of their enzymatic repertoire. Cold-adapted (psychrophilic) enzymes are invariably characterised by high catalytic activity at low temperatures, necessary to endure the exponential reduction of the speed of chemical reactions in these conditions, and by low thermal stability. Numerous studies aimed at understanding the mechanisms of such adaptation at the molecular level agree that the high turnover observed for psychr

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21

Webster, Stephen. "Prospects for Bose-Einstein condensation in caesium : cold collisions and dipole-force trapping." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325563.

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22

Grey, Christopher Norton. "Cold-Formed Steel Behavior: Elastic Buckling Simplified Methods for Structural Members with Edge-Stiffened Holes and Purlin Distortional Buckling Strength Under Gravity Loading." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/32829.

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Elastic Buckling Simplified Methods for Structural Members with Edge-Stiffened Holes: Presently, the current design methods available to engineers to predict the strength of cold-formed steel members with edge-stiffened holes remains largely unaddressed in the North American Specification for the Design of Cold-Formed Steel Structural Members (NAS). Research was conducted to explore and develop a further understanding of the effects of stiffened edge holes on the elastic buckling parameters for local, distortional, and global buckling. Elastic buckling parameter studies have been conducted

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23

Stojadinovic, Strahinja. "Light Scattering Studies of Dynamics of Bent-Core Liquid Crystals." Kent State University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=kent1105330884.

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24

Majumdar, Madhabi. "Elastic Constants, Viscosities and Fluctuation Modes of Certain Bent-Core Nematic Liquid Crystals Studied by Dynamic Light Scattering and Magnetic Field Induced Orientational Distortion." Kent State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=kent1321991835.

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25

Ngo, Quang Tien. "Thermo-elasto-plastic uncoupling model of width variation for online application in automotive cold rolling process." Thesis, Paris Est, 2015. http://www.theses.fr/2015PEST1063/document.

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Afin d'optimiser la mise aux milles au laminage à froid, la thèse consiste à développer un modèle prédictif de variation de largeur à la fois précis et rapide pour des utilisations en temps réel. Des efforts ont commencé en 1960s en développant des formules empiriques. Par la suite, la Méthode des Bornes Supérieures (MBS) est devenue la plus connue. [Oh 1975] utilisant le champ de vitesse 3D "simple" prédit bien la variation de largeur au laminage en conditions d'un tandem finisseur. [Komori 2002] a proposé une combinaison des champs fondamentaux et obtenu une structure informatique peu dépend

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26

Sakae, Flavio Akira. "Distribuição das fibras colágenas e do sistema de fibras elásticas na camada superficial da lâmina própria da prega vocal com edema de Reinke." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/5/5143/tde-31102008-173147/.

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A fisiopatologia do edema de Reinke ainda permanece desconhecida e poucos estudos abordam sobre as alterações das proteínas fibrosas, colágeno e elastina, na matriz extracelular da prega vocal com edema de Reinke. Por isso, este estudo foi idealizado para descrever a distribuição das fibras colágenas e do sistema de fibras elásticas do espaço de Reinke com edema de Reinke comparando com a prega vocal normal e com a severidade do edema. Foram obtidas 20 amostras de pregas vocais de indivíduos com edema de Reinke, sendo nove casos com edema de Reinke grau II e 11 casos grau III. Dezessete indiví

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27

Gao, Yifei. "Response of Curved Composite Panels under External Blast." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1404084105.

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28

Aksouh, Farouk. "Investigation of the core-halo structure of the neutron-rich nuclei $^6$He and $^8$He by intermediate-energy elastic proton scattering at high momentum transfer." Phd thesis, Université Paris Sud - Paris XI, 2002. http://tel.archives-ouvertes.fr/tel-00006046.

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29

Dolamune, Kankanamge Nirosha. "Structural behaviour and design of cold-formed steel beams at elevated temperatures." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/33221/1/Nirosha_Dolamune_Kankanamge_Thesis.pdf.

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Cold-formed steel members are extensively used in the building construction industry, especially in residential, commercial and industrial buildings. In recent times, fire safety has become important in structural design due to increased fire damage to properties and loss of lives. However, past research into the fire performance of cold-formed steel members has been limited, and was confined to compression members. Therefore a research project was undertaken to investigate the structural behaviour of compact cold-formed steel lipped channel beams subject to inelastic local buckling and yieldi

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Silva, Vanessa Dias da. "An?lise in vitro e in vivo das altera??es de cor das ligaduras elasticas est?ticas." Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2014. http://tede2.pucrs.br/tede2/handle/tede/7189.

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Submitted by Caroline Xavier (caroline.xavier@pucrs.br) on 2017-03-24T17:57:16Z No. of bitstreams: 1 DIS_VANESSA_DIAS_DA_SILVA_COMPLETO.pdf: 842626 bytes, checksum: 31fcd5d879db0185485acc8e2f7bd3e2 (MD5)<br>Made available in DSpace on 2017-03-24T17:57:16Z (GMT). No. of bitstreams: 1 DIS_VANESSA_DIAS_DA_SILVA_COMPLETO.pdf: 842626 bytes, checksum: 31fcd5d879db0185485acc8e2f7bd3e2 (MD5) Previous issue date: 2014-03-26<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES<br>Proposition: The objective of this study was evaluated in vitro and in vivo the color changes of esthetic

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31

Wilkinson, Timothy James. "The Plastic Behaviour of Cold-Formed Rectangular Hollow Sections." University of Sydney. Department of Civil Engineering, 2000. http://hdl.handle.net/2123/843.

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The aim of this thesis is to assess the suitability of cold-formed rectangular hollow sections (RHS) for plastic design. The project involved an extensive range of tests on cold-formed Grade C350 and Grade C450 (DuraGal) RHS beams, joints and frames. A large number of finite element analyses was also carried out on models of RHS beams. The conclusion is that cold- formed RHS can be used in plastic design, but stricter element slenderness (b/t) limits and consideration of the connections, are required. Further research, particularly into the effect of axial compression on element slendernes

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Wilkinson, Timothy James. "The Plastic Behaviour of Cold-Formed Rectangular Hollow Sections." Thesis, The University of Sydney, 1999. http://hdl.handle.net/2123/843.

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The aim of this thesis is to assess the suitability of cold-formed rectangular hollow sections (RHS) for plastic design. The project involved an extensive range of tests on cold-formed Grade C350 and Grade C450 (DuraGal) RHS beams, joints and frames. A large number of finite element analyses was also carried out on models of RHS beams. The conclusion is that cold- formed RHS can be used in plastic design, but stricter element slenderness (b/t) limits and consideration of the connections, are required. Further research, particularly into the effect of axial compression on element slendernes

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33

Meghraoui-Keddar, Aïda. "Peptides d'élastine et modulation de la réponse T helper au cours de la Broncho-Pneumopathie Chronique Obstructive (BPCO)." Thesis, Reims, 2015. http://www.theses.fr/2015REIMP203.

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La Broncho-Pneumopathie Chronique Obstructive (BPCO) est une pathologie inflammatoire chronique caractérisée par une détérioration irréversible des voies aériennes et des espaces alvéolaires. L'emphysème est la composante principale de la BPCO et l'exposition à la fumée de cigarette en est le principal facteur étiologique. La réponse inflammatoire au cours de la BPCO est caractérisée par une infiltration massive du tissu respiratoire par les cellules inflammatoires qui sécrètent de nombreuses protéases. Ces protéases participent à la dégradation des composants de la matrice extracellulaire et

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Adam, Adeline. "étude du couplage élastique au sein d'hétérostructures cœur-coquille à base d'analogues du bleu de Prusse." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLX076/document.

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Le contrôle optique des propriétés physiques d’un matériau suscite l’intérêt des scientifiques pour des enjeux aussi bien fondamentaux qu’appliqués. L’axe de recherche original que nous avons développé dans le cadre de ce travail de thèse visait à la réalisation et l’étude d’hétérostructures moléculaires photo-magnétiques dans des gammes de température susceptibles d’applications. L’approche proposée consistait à élaborer des hétérostructures de type multiferroïque constituées de deux phases, l’une piézomagnétique et l’autre photo-strictive. L’idée était d’optimiser le couplage, d’origine élas

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Greco, Cristina. "Liquid crystals of bent-shaped molecules: modelling their unconventional properties and phase behaviour." Doctoral thesis, Università degli studi di Padova, 2015. http://hdl.handle.net/11577/3424259.

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The fascinating behaviour of liquid crystals is a consequence of the shape anisotropy of their constituent molecules. Conventional mesogens have a rod-like or disc-like shape: their simplest and most common mode of liquid crystalline organization is the nematic phase (N), where the molecules preferentially align along a common axis, called the director n. Recently a new class of thermotropic liquid crystals has emerged, made of achiral molecules with a bent (banana-like) shape. From a chemical point of view, two molecular architectures can be distinguished: bent-core compounds and odd liquid c

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Jatheeshan, Varathananthan. "Numerical and experimental studies of cold-formed steel floor systems made of hollow flange section joists in fire." Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/120145/1/Varathananthan_Jatheeshan_Thesis.pdf.

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The cold-formed steel utilization in buildings has increased globally due to its higher strength to weight ratio, ease of transportation and rapid erection and dismantlement. However, cold-formed steel buildings must be designed with adequate Fire Resistance Ratings (FRR). Hence cold-formed Light gauge Steel Frames (LSF) are assembled using channel sections and lined with fire resistive plasterboards to provide load-bearing wall and floor systems. There is an industry need to develop LSF floor systems with improved FRR. Adding multiple layers of plasterboard to increase the FRR of LSF floor

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Nita, Luciana Miwa. "Estudo histoquímico e ultra-estrutural da distribuição das fibras da matriz extracelular na prega vocal humana fetal no período perinatal." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/5/5143/tde-29052008-093547/.

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Acredita-se que nos humanos, o ligamento vocal se desenvolva após o nascimento. No entanto, não há consenso na literatura sobre qual a faixa etária de seu aparecimento. Muitos estudos indicam que no neonato, a lâmina própria da prega vocal apresenta-se com algumas fibras esparsas sem uma organização particular. O principal objetivo deste estudo foi obter informação a respeito das fibras colagênicas e do sistema elástico (sob a luz dos conhecimentos atuais sobre a matriz extracelular), na lâmina própria de pregas vocais de fetos no período perinatal. Laringes obtidas por autópsia de fetos entre

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Asker, Christian. "Effects of disorder in metallic systems from First-Principles calculations." Doctoral thesis, Linköpings universitet, Teoretisk Fysik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-53584.

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In this thesis, quantum-mechanical calculations within density-functional theory on metallic systems are presented. The overarching goal has been to investigate effects of disorder. In particular, one of the properties investigated is the bindingenergy shifts for core electrons in binary alloys using different theoretical methods. These methods are compared with each other and with experimental results. One such method, the so-called Slater-Janak transition state method relies on the assumption that the single-particle eigenvalues within density-functional theory are linear functions of their

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Pierre, Alexandre. "VIPEBCO - Rôle du vieillissement et des peptides d’élastine sur la réponse immune adaptative au cours de la BPCO." Thesis, Reims, 2017. http://www.theses.fr/2017REIMM206/document.

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La BPCO est une affection de l’appareil respiratoire associée à une réponse inflammatoire chronique. La BPCO associe une bronchite chronique, avec obstruction des voies aériennes, et un emphysème caractérisé par la destruction du parenchyme pulmonaire. Si l’exposition au tabac est le facteur de risque principal de la BPCO, plusieurs observations cliniques sont en faveur du rôle du vieillissement dans la pathogénèse de la maladie. La dégradation des fibres élastiques du poumon en peptides solubles d’élastine (PE) est une caractéristique constante de la BPCO, et le vieillissement physiologique d

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Juliani, Lucas Marrara. "Avaliação das propriedades mecânicas do concreto de lajes alveolares pré-fabricadas utilizando ensaios não destrutivos." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-26032015-100400/.

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Este trabalho apresenta dois tipos de ensaios não destrutivos para a correlação do módulo dinâmico com a resistência à compressão para elementos de concreto. Os métodos de ensaio são a ultrassonografia e o método de excitação por impulso utilizando o equipamento Sonelastic®. Neste trabalho estão descritos seus funcionamentos, aplicações e limitações. A ultrassonografia, através da propagação de ondas sonoras, fornece, indiretamente, o módulo de elasticidade dinâmico. Com o método de excitação por impulso obtêm-se as frequências naturais e os modos de vibração do elemento estudado, o que permit

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Soares, Rodrigo Gonçalves. "Avaliação da resistência flexural, módulo de elasticidade e parâmetros de cor de resinas acrílizas utilizadas para restaurações provisórias com fibra de vidro." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/58/58131/tde-20022009-094117/.

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Restauração provisória é uma importante fase da reabilitação bucal com prótese parcial fixa, deve fornecer proteção pulpar e periodontal, apresentar integridade marginal e estética, ter durabilidade suficiente para resistir às forças mastigatórias. Pacientes com bruxismo ou aqueles cujo tratamento requer períodos longos de uso das restaurações provisórias necessitam de material com melhores propriedades mecânicas. Vários métodos têm sido empregados para reforçar próteses fixas provisórias, como fios metálicos, reforço metálico e incorporação de diferentes tipos de fibras, como carbono, polieti

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Tong, Xiaolong. "A Constitutive Model for Crushable Polymer Foams Used in Sandwich Panels: Theory and FEA Application." University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1596806015399848.

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Борисюк, Вадим Миколайович, Вадим Николаевич Борисюк та Vadym Mykolaiovych Borysiuk. "Механічні властивості та фазові переходи в Tin+1Cn максенах і металевих наноматеріалах під дією зовнішнього впливу деформації та температури". Thesis, Сумський державний університет, 2021. https://essuir.sumdu.edu.ua/handle/123456789/83599.

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Дисертаційна робота присвячена встановленню закономірностей структурних змін та фазових перетворень у двовимірних системах та металевих наноматеріалах під різним типом зовнішньої дії, а також зв’язку цих перетворень з фізичними властивостями досліджуваних систем. Основним результатом роботи є запропонована концепція дослідження наноматеріалів, що базується на методах класичної молекулярної динаміки та теоретичної фізики, яка була застосована для розрахунку ефективних механічних параметрів та описанні поведінки двовимірних карбідів титану та інших низькорозмірних систем під дією зовнішнього впл

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Gbemou, Kodjovi. "Modélisation de l’interaction des coeurs de dislocations et des joints de grains." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0045/document.

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Durant cette thèse, on s’intéresse à l’application et au développement d’une théorie de mécanique des champs de dislocations et de désinclinaisons pour modéliser de façon continue les structures de cœur des dislocations et des joints de grains ainsi que leurs interactions. Le vecteur de Burgers/Frank des dislocations/désinclinaisons est régularisé par l’introduction d’un tenseur densité de dislocations/désinclinaisons. A ces densités de défauts sont associées des déformations et des courbures élastiques et plastiques incompatibles responsables de champs de contraintes et de moments de contrain

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Andersson, Martin. "Phase Phenomena in Polymer Networks : Empirical Studies on the Influence of Hydrophobicity, Charge Density and Crosslinks on Macroion-Induced Phase Transitions in Polyelectrolyte Gels." Doctoral thesis, Uppsala universitet, Institutionen för farmaci, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-145381.

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The thesis concerns polyelectrolyte gels in contact with oppositely charged proteins and surfactant micelles, and includes of four papers (I-IV). In paper I confocal Raman spectroscopy was introduced as a method to trace micelles and investigate the structure of gel-surfactant complexes, in phase separated gel spheres. In paper II, the binding of surfactants to microspheres (~50-100 µm) was investigated by means of a micromanipulator-assisted microscopy method. The two surfactants were found to display qualitative difference respect to degree of swelling, surfactant distribution in the gels, a

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Ménétrier, Arnaud. "Modalités d'exercice et de récupération : approche cardiovasculaire et performance." Thesis, Besançon, 2013. http://www.theses.fr/2013BESA3014/document.

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(Cf. corpus p. 25-26) Ce travail de thèse s'est articulé autour de deux problématiques : les réponses cardiovasculaires consécutives à l/ différents protocoles d'exercice et 2/ différents protocoles de récupération. Concernant la première, 3 protocoles de recherches ont été menés. L'un avait pour objectif de déterminer les effets aigus d'exercices de même durée proposant une quantité de travail totale équivalente distribuée de façon constante (CC) ou intermittente (IT), sur la rigidité artérielle multi-segmentaire et ses déterminants. Les deux autres se proposaient d'explorer les dysfonctions

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Júnior, Adonias Ribeiro Franco. "Obtenção de revestimentos dúplex por nitretação a plasma e PVD-TiN em aços ferramenta AISI D2 e AISI H13." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-02102003-114623/.

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No presente trabalho foi avaliado o efeito da microestrutura e da capacidade de suportar carregamento de camadas nitretadas produzidas em aços ferramenta AISI H13 e AISI D2 sobre a aderência e a resistência ao desgaste microabrasivo de revestimentos de TiN-PVD. Em cada um desses aços, foram produzidas camadas nitretadas de diferentes estruturas e espessuras, e foram determinadas experimentalmente as curvas potencial início de formação de camada branca, para a nitretação a 520oC. Para o aço ferramenta AISI H13, o emprego de tempos de pré-tratamento de nitretação mais prolongados ( aproximadamen

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QIU, HUA-ZHANG, and 邱華彰. "A study on the spandex elastic core spun yarn formation." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/30551106903336064568.

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mei-chi, ma, and 馬美琪. "A Study on the Structure and Elasticity of Elastic Core-Spun Yarn." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/56584002731639447663.

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碩士<br>國立臺灣科技大學<br>纖維及高分子工程系<br>90<br>In this experiment, we adopt Lycra spandex filament as the core and cotton fiber as the sheath to spin the elastic core-spun yarn. For the optimum spinning condition, we study the effect of draw ratio and feed-in position on the structure and elasticity of elastic core-spun yarn. In addition, we examine the yarn cross section and elastic recovery in order to improve the yarn property. The results reveal that a feed-in position of 1200 has a better cover effect, and the draw ratio of 3~4 maintains a better and steady streach recovery. I

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Wen, Chang Ching, and 張錦雯. "The Technology of the Elastic Core Spun Yarn by Multi-Stage Drawing." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/03398945062858392527.

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碩士<br>逢甲大學<br>紡織工程學系<br>88<br>The key point of the thesis is that the process and improvement of the spandex elastic core spun yarns, in order to improve the defect of spandex filament relating to the process and the property. The formation of the spandex∕T/R and spandex∕R elastic core spun yarn was spun by using the modified ring spinning frame and the proposed multi-stage drawing frame. During the variation of the roller drawing stage and the drawing ratio of spandex filament, the maximum breaking strength, elongation and the modulus of bias of the elastic core spun yarns were investigated.

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