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Li, Qizhen. "Theory and modeling of the mechanical behavior of nanoscale and finescale multilayer thin films." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1095684024.
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Thesis (Ph. D.)--Ohio State University, 2004.Title from first page of PDF file. Document formatted into pages; contains xviii, 190 p.; also includes graphics. Includes bibliographical references (p. 181-190).
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Souza, Júlio César Matias de. "Misfit of Morse taper implant joints." Master's thesis, [s.n.], 2012. http://hdl.handle.net/10284/3715.
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Projeto de Pós-Graduação/Dissertação apresentado à Universidade Fernando Pessoa como parte dos requisitos para obtenção do grau de Mestre em Medicina DentáriaFalhas em sistemas de implantes dentários causadas pelo acúmulo de biofilmes, inflamação peri-implantar e degradação de materiais tem sido associadas ao desajuste de conexões entre pilares protéticos e implantes dentários. Sendo assim, o objetivo desse estudo foi caracterizar o ajuste implante-pilar de um sistema do tipo cone Morse por técnicas microscópicas. Um grupo de dez implantes e respectivos minipilares protéticos foram estudados. Superfícies da área das conexões dos implantes e dos minipilares protéticos foram inspecionadas por microscopia eletrônica de varrimento (MEV). Em seguida, os componentes foram conectados sob torque de 32 Ncm e embutidos em resina epóxica. As amostras implante-minipilar foram então seccionadas perpendicularmente ao plano da conexão implante-minipilar para mensuração das microfendas por MEV. Além disso, as áreas inspecionadas por MEV foram também analisadas quanto a composição química por espectroscopia de energia dispersiva (EDS) assim como por testes de nanoindentação e microdureza de Vickers. Defeitos originados do processamento foram detectados em todos as superfícies dos minipilares analisados por MEV. Os valores das dimensões das microfendas entre implante e minipilar variaram de 0,5 a 5 μm, aproximadamente. A presença de defeitos nas áreas de conexão intensificou a discrepância das microfendas. Os elementos Ti, Al e V foram identificados no espectro obtido por EDS dos minipilares o que sugere a composição da liga Ti6Al4V. Já para os implantes, apenas o elemento Ti foi identificado, o que confirma a sua composição baseada em titânio comercialmente puro. Maiores valores de microdureza Vickers foram encontrados para o pilar protético de Ti6Al4V (360 ± 17 HV) quando comparados aos valores para os implante de Ti CP (320 ± 8 HV). A diferença entre os valores de dureza do minipilar e implante dentário pode acelerar o processo de desgaste das conexões sob mcromovimentos durante a mastigação e aumentar as dimensões das microfendas. A adaptação pilar-implante pode ser alterada pelos defeitos aumentando assim tamanho dos microgaps e consequentemente facilitando o acúmulo de biofilmes e fluidos orais. Failures in dental implants systems caused by biofilm accumulation, peri-implant inflammation and material degradation have been correlated to the misfit of implantabutment joints. The main aim of this study was to characterize the fit of Morse Taper implant-abutment joints by microscopic analyses. Surfaces of 10 Morse taper implant systems were inspected by scanning electron microscopy (SEM) before connection. After initial inspection, the implant-abutment systems were connected by applying a torque of 32 Ncm. For microgaps measurements by SEM, implant-abutment assemblies were embedded in epoxy resin and cross-sectioned at a perpendicular plane of the implant-abutment joint. Also, microhardness, nanoindentation and chemical analyses were performed at the implant-abutment joints. Concerning surfaces, defects originated from industrial processing were noticed on different areas of the abutment surfaces. On implant-abutment misfit measurements, the size of microgaps ranged from 0.5 μm up to 5.6 μm. Defects were also detected at implant-abutment microgaps that can increase the microgap size after connection. Microhardness tests revealed a higher hardness (360 ± 17 HV) for Ti6Al4V-based abutment when compared to implant composed of commercially pure titanium (320 ± 8 HV). The mismatch in mechanical properties between abutment and implant can increase the degradation of structural materials under micro-movements during mastication affecting the implant-abutment misfit and mechanical integrity of the implant-abutment joints during mastication. Defects on surfaces of abutments can intensify misfit of Morse taper implant joints. That might allow the penetration of oral microorganisms and fluids.
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Kidwell, Billy R. "MiSFIT: Mining Software Fault Information and Types." UKnowledge, 2015. http://uknowledge.uky.edu/cs_etds/33.
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As software becomes more important to society, the number, age, and complexity of systems grow. Software organizations require continuous process improvement to maintain the reliability, security, and quality of these software systems. Software organizations can utilize data from manual fault classification to meet their process improvement needs, but organizations lack the expertise or resources to implement them correctly.
This dissertation addresses the need for the automation of software fault classification. Validation results show that automated fault classification, as implemented in the MiSFIT tool, can group faults of similar nature. The resulting classifications result in good agreement for common software faults with no manual effort.
To evaluate the method and tool, I develop and apply an extended change taxonomy to classify the source code changes that repaired software faults from an open source project. MiSFIT clusters the faults based on the changes. I manually inspect a random sample of faults from each cluster to validate the results. The automatically classified faults are used to analyze the evolution of a software application over seven major releases. The contributions of this dissertation are an extended change taxonomy for software fault analysis, a method to cluster faults by the syntax of the repair, empirical evidence that fault distribution varies according to the purpose of the module, and the identification of project-specific trends from the analysis of the changes.
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Anderson, Michael D. 1980. "Novel Misfit Layer Systems: Synthesis and Characterization." Thesis, University of Oregon, 2011. http://hdl.handle.net/1794/12092.
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xxiv, 265 p. : ill. (some col.)Stabilizing mechanisms and design considerations for generating misfit layer compounds with a variety of different structural motifs were explored using designed precursors consisting of elemental layers. Layer order in the precursor film and the behavior of binary reaction couples was used to avoid undesirable reaction intermediates. Electron diffraction patterns of CuCr2 Se4 were inconsistent with prior reports that this compound has the spinel structure and were more consistent with a hexagonal R 3 ̄ structure. STEM imaging also suggests CuCr2 Se4 prepared using the compositionally modulated kinetic trapping approach is a new polymorph of the spinel structure. Electrical and magnetic properties were consistent with prior literature reports. Magnetic susceptibility measurements show pronounced hard and easy axes of magnetization not previously documented, which are consistent with a hexagonal crystal symmetry. The [{(PbSe)m }0.99 (WSe2 )n ] r and [{(PbSe)m }1.00 (MoSe2 )n ] r systems were investigated by STEM, XRD and density functional theory (DFT) modeling. No crystallographic registration between MSe and TSe 2 layers was observed and the diffraction observed in the hk 0 and hkl directions, where h = k = 0, can be described by diffraction from discrete layers of finite thickness. A distortion of the MX structure for m > 4 was documented. The distortion in MSe layers was largest for m = 2 and independent of TSe2 thickness. A novel family of compounds, [{(FeSe)m }1+y (NbSe 2 )n ]r , were synthesized inspired by a geological precedent. Single FeSe and NbSe2 layer thicknesses ((0.571 ± 0.005) nm and (0.653 ± 0.002) nm respectively) are consistent with literature values for the binary compounds. STEM-HAADF images of the [{(FeSe) 5 }1+y (NbSe2 )5 ]r revealed a multilayer structure with two distinct structural subunits. STEM-EELS analysis of the film showed no intermixing between the Nb and Fe regions within the limit of the measurement. Another family of misfit layer compounds, [{(NbSe2 )m }1+y (CuCr2Se4)n]r, designed to test requirements for a stable misfit layer compound, were successfully synthesized. STEM analysis of the [{(NbSe2 )5 }1+y (CuCr2 Se4 ) 1 ]r compound showed a well segregated film with two distinct subunit structures. Thicknesses for individual layers of NbSe2 or CuCr2 Se4 ((0.648 ± 0.004) nm and (1.76 ± 0.01) nm respectively) are consistent with prior literature reports of the individual binary compounds. This dissertation includes previously published and unpublished co-authored material.
Committee in charge: Dr. Mark C. Lonergan, Chair; Dr. David C. Johnson, Advisor; Dr. James Hutchison, Member; Dr. Catherine Page, Member; Dr. Stephen Gregory, Outside Member; Dr. Ian M. Anderson, Honorary Member
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Peeters, Erik Christian. "Resistant misfit subjectivities in selected postcolonial literary texts." Thesis, University of Leeds, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.439582.
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Kulwongwit, Nuth. "P-type, misfit layered structure cobaltite for thermoelectric applications." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/ptype-misfit-layered-structure-cobaltite-for-thermoelectric-applications(c967ef03-5dd2-444d-b99b-1a1f784d10f0).html.
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The thermoelectric properties and microstructure of two families of misfit type layered structure cobaltites were investigated for thermoelectric applications. Firstly, Bismuth strontium cobaltite ceramics with the formulations Bi2+xSr2Co2Oy (x=0, 0.1 and 0.2), Bi1.74Sr2Co1.8Oy and Bi2Sr2Co1.8Oy were produced using solid-state reaction (MO) method. The same powders were also used to produce ceramics by Spark Plasma Sintering (SPS) fabrication technique. SEM, high resolution XRD and HRTEM techniques has been employed to characterise the microstructure and crystal structures of the ceramics. Figure of merit (ZT) was also determined from measurement of electrical resistivity, Seebeck coefficient and thermal conductivity. Together with the above, calcium cobaltite of formulation Ca3-xBixCo3O9 (x=0 and 0.3) was also produced via MO and SPS routes. The same characterisation techniques were used for characterisation of calcium cobaltite. For Bi2+xSr2Co2Oy ceramics, it was found that SPS fabrication is essential to obtain high density samples. Excess bismuth has a major role in the adjustment of the microstructure and thermoelectric properties. The room temperature microstructure contains two minor phases with compositions of CoO and Bi0.75Sr0.25O1.26. The crystal structure of the main phase was successfully indexed and refined as misfit type structure having monoclinic symmetry with I2/a space group. A high ZT of 0.12 was achieved in both x=0.1 and 0.2 MO samples. For Bi2Sr2Co1.8Oy ceramics, the microstructure contains only one minor phase, Bi0.75Sr0.25O1.26. A high ZT of 0.16 was obtained at 900 K for this composition. For Bi1.74Sr2Co1.8Oy, it was not possible to obtain high density ceramics by MO route and SPS fabrication was necessary. However, SPS sample showed a low ZT of 0.04 at 900 K.For ceramics of formulation Ca3-xBixCo3O9 (x=0 and 0.3), it was difficult to obtain high density calcium cobaltite ceramics by MO route and SPS fabrication was found to be essential. In addition to improved density, SPS produced textured microstructure. Similar to bismuth strontium cobaltite, excess bismuth played a major role in microstructure development and thermoelectric properties. Single phase and high density Ca3Co4O9 ceramics were obtained by SPS. A minor phase of Bi2Ca2Co2Oy was found in the microstructure of Ca3-xBixCo3O4 (x=0.3) samples. A high ZT of 0.25 was obtained for Ca3Co4O9 SPS samples at 900 K through improvement of power factor. In-situ synchrotron XRD in the temperature range of 300-1223 K was performed on both Bi2Sr2Co2Oy and Ca3Co4O9 to obtain their high temperature structural characteristics. The crystal structure of both compounds remains unchanged till 1223 K. For, Bi2Sr2Co2Oy the CoO and Bi0.75Sr0.25O1.26 minor phases disappear above 1073 K and a new minor phase containing (Bi-Sr-O) or (Bi-Co-O) starts forming. On heating, the lattice volume and coefficient of thermal expansion change linearly for both compounds. Thermal expansion coefficient was found to be 0.0000353-0.0000343 and 0.0000296-0.0000288 K-1 over the temperature range of 300-1223 K for Bi2Sr2Co2Oy and Ca3Co4O9 respectively.
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Mylonas, Stamatis. "TEM studies of nucleation of misfit dislocations in semiconductor heterostructures." Thesis, University of Bristol, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319014.
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Wang, Junyan. "Empirical Bayes Model Averaging in the Presence of Model Misfit." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1469437723.
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Adolfsson, Johan. "Venture Capitalists on the Seed Stage Arena : A Fit or Misfit." Thesis, Linköping University, Department of Management and Economics, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1877.
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Background: Growth oriented entrepreneurial businesses need funding for the development of their idea, technology, product etc. However, for the businesses in the very earliest stages of development, access to funding is very limited. Growing young ventures are important job creators and positively affect growth in an economy. Bridging the gap of funding to these companies is therefore on the agenda of governments around the world.
Purpose: To describe the situation facing seed stage investing venture capitalists. I will emphasize difficulties and evaluate venture capitalists ability in addressing them. Effects of the difficulties in form of access to financing for entrepreneurs and a possible need for government intervention will be examined.
Method: Empirical information from seed stage investing venture capital organizations have been collected in the form of face-to-face interviews, email- questionnaires and a telephone interview. Organizations from Sweden, Denmark and Germany are included in the study.
Result: Several factors make seed stage investing unattractive compared to later stages. Important difficulties are higher risks, high costs for fund management, goal incongruence in the investor – venture capitalist relation and lack of bargaining power for seed venture capitalists. Environmental factorsthat have an impact on seed investing are the deal flow, the investment climate and access to soft funding. Seed stage investing is a very challenging business and the difficulties are to a large extent hard to overcome. The investors more likely have to accept them and I conclude that long term profitability of seed funds is unlikely, at least in absence of government support in form of soft funding towards the entrepreneurial businesses.
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Talbot, Danielle Laurette. "Organisational fit and misfit : An empirical study of similartities and differences." Thesis, Open University, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.533108.
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This thesis focuses on employees' experiences of fit and misfit at work. This falls within the person-environment fit (PE fit) literature which is based on principles founded in interactional psychology that when a person fits the environment that they are in, positive outcomes, such as job satisfaction, will result. Despite a wealth of empirical studiesin theP E fit field studyingv ariousa spectso f individuals' fit with their work environmentt,h erea re significantg apsi n knowledgea ndu nderstanding.O neo f thesei s that little researchh as investigatedh ow employeese xperiencefi t andm isfit. A secondg ap is that little is known aboutm isfit and whethert his is the oppositet o fit, an absenceo f fit or a separateca tegoricasl tate. The researchf ocusedo n theseg apsi n the literaturea nd took a qualitative, exploratory approach to gain in-depth understanding of the factors affecting individuals' fit in organisations. Causalm appingt echniquesw ereu sedt o allow the study'sp articipantst o express their perceptionsw ithout beingp romptedt o speaka bouts pecifict opics. The resultingd ata were coded using measures from the PE fit literature to explore whether the extant measuresa dequatelyc apturedp eople'se xperiencesa nd also to assessw hethert herew ere differencesb etweenf it andm isfit. The researchfo und that the extantP E fit measures explainedp articipants'e xperienceos f fit andm isfit well but that ast hesea re focusedo n factors within the organisational environment, they miss external factors such as people's links with their communities. It seems that the majority of individuals experience misfit to some extent but that overwhelming misfit perceptions can be triggered by a change in the organisation. Misfit and fit are shown to differ, most profoundly in that whereas fit is a positive experience, misfit is negative and a state to be avoided.
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Stirpe, Mark Benedetto. "The study of defects in low misfit GE-SI strained layer heterostructures." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0009/MQ34152.pdf.
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Sagoe-Crentsil, Kwesi Kurentsir. "The effect of misfit on morphology and kinetics of plate shaped precipitates." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/29380.
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Lattice misfit and its effect on the morphology, interfacial structure and kinetics of plate shaped precipitates are investigated in this study. The 7-Ag₂Al phase in the Al-Ag system was used as the reference system and its misfit was controlled by ternary additions of Mg and Cu. The addition of 0.S1 at% Mg was found to increase the misfit from 0.8% for the binary to 1.11%. Cu additions on the other hand, reduced the misfit by 0.38% for Cu concentrations up to 0.51 at%. Electron probe microanalysis showed that the Mg atoms preferentially partition to the 7 phase whereas Cu atoms partition equally between the precipitate and matrix phases.
Direct transmission election rnicroscope observations were made on the interface structure in both the equilibrated state and during precipitate dissolution. The interface structure in the ternary Mg alloy consisted of a hexagonal network of partial dislocations which essentially remained the same before and during dissolution. A single array of a/2<110> dislocations was observed in the binary and ternary Cu systems prior to dissolution. This unit array transformed to a stable hexagonal network structure having the equilibrium spacing at the onset of dissolution and remained throughout the period of dissolution.
The thinning and shortening kinetics of the precipitate plates were at least five times slower than the rates for volume diffusion control in all three systems. This interfacial inhibition has further been confirmed by the consistent fall below equilibrium values of the interface concentration as determined from electron probe microanalysis. This suggests the operation of a ledge migration mechanism. A mechanism of acquiring ledge/dislocations at the interface is used as a basis to correlate the
observed kinetics with misfit and ledge migration at the precipitate-matrix interphase. The
mechanism involves co-ordinated motion of sets of dislocations in the network which rids the surface of the highest steps thereby accomplishing dissolution.Applied Science, Faculty of
Materials Engineering, Department of
Graduate
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Smeller, Mary Magdalene. "Structural Studies of [(PbSe)0.99]m[WSe2]n, [(PbSe)1.00]m[MoSe2]n, and [(SnSe)1.03]m[MoSe2]n Misfit Layered Compounds." Thesis, University of Oregon, 2011. http://hdl.handle.net/1794/11580.
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xvi, 145 p. : ill. (some col.)The structures of several compounds in the [(PbSe)0.99]m[WSe2]n, [(PbSe)1.00]1[MoSe2]1, and [(SnSe)1.03]1[MoSe2]1 systems were determined using x-ray data. The structural determination using Rietveld methods was complicated by the strong preferred orientation of the samples, which resulted in x-ray diffraction scans with either 00l or hk0 reflections depending on the orientation of the sample in the diffractometer. Rietveld refinements of the [(PbSe)0.99]1[WSe2]1, [(PbSe)1.00]1[MoSe2]1, and [(SnSe)1.03]1[MoSe2]1 samples were compared to single crystal sample refinement results for [(MX)1+d]1[TX2]1, where M is a metal, T is a transition, X is a chalcogen, and d is the misfit parameter. The structural refinement yielded rock salt layer puckering values of 25 pm, 23 pm, and 36 pm for [(PbSe)0.99]1[WSe2]1, [(PbSe)1.00]1[MoSe2]1, and [(SnSe)1.03]1[MoSe2]1, respectively, which are all within the established literature range of 20 pm to 60 pm. The refinement of the hk0 reflections confirmed that the in plane structures were consistent with the dichalcogenide (P63mmc) and rock salt (Fm3m) structure types. Structures for the [(PbSe)0.99]m[WSe2]m isomer series where m = 1 to 5 were determined, and a systematic trend in structure as a function of the thickness of the constituent layers was discovered. The structure of the rock salt constituent was found to distort into pairs, forming alternating long and short distances along the c axis. This distortion decreases as the number of rock salt planes increases from 4 to 6 to 8 and is either absent or nearly so in compounds with a larger number of rock salt planes. The puckering distortion at the interface between the rock salt and the dichalcogenide is also observed in the inner rock salt layers but decreases in magnitude moving away from the rock salt – dichalcogenide interface. Structures of [(PbSe)0.99]m[WSe2]n where m = 1 or 2 and n = 1 or 2 were also determined. The degree of structural distortion is a function of the ratio of rock salt to dichalcogenide layers. This dissertation includes unpublished co-authored material.
Committee in charge: Dr. Thomas R. Dyke, Ph.D., Chairperson; Dr. David C. Johnson, Ph.D., Advisor; Dr. Catherine J. Page, Ph.D., Member; Dr. Andrew H. Marcus, Ph.D., Member; Dr. John L. Hardwick, Ph.D., Member; Dr. Richard Taylor, Ph.D., Outside Member
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Bebermeyer, Robert E. "Experimental study on the effect of misfit and mismatch of ship plating welds." Thesis, Monterey, California ; Naval Postgraduate School, 2002. http://hdl.handle.net/10945/3127.
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CIVINSApproved for public release; distribution is unlimited
Misfits and mismatches in the welding of ship hull plating may affect survivability after explosions, accidents, or other extreme external forces. Experiments, Slip Line Theory (SLT), and Finite Element Analysis (FEA) help to explain the necking, deformation, and mechanisms of fracture of misfit welded plating. The effect of misfits or offsets on both overmatched and evenmatched welds under tension are studied. The tension creates a moment about the offset weld causing the weld to rotate and the material around the weld to thin down, but strain hardening reduces the thinning that occurs and shifts deformation elsewhere away from the weld. EH-36, a commercial medium strength steel now being used in Navy surface combatants, was tested. The overmatched EH-36 misfit welds experienced rotation, minor thinning near the weld, and deformation elsewhere as predicted. AL6XN, a new stainless steel with evenmatched welds, gave nearly the same results as the EH-36. There was a 3% reduction in maximum applied force per area for the 30% offset case, and an increase in the amount of thinning near the weld.
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Büttner, Gesine [Verfasser], and Anke [Akademischer Betreuer] Weidenkaff. "Misfit-layered cobalt oxides for thermoelectric energy conversion / Gesine Büttner ; Betreuer: Anke Weidenkaff." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2017. http://d-nb.info/1159570256/34.
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Bebermeyer, Robert E. 1968. "Experimental study on the effect of misfit and mismatch of ship plating welds." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/91360.
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Thesis (Nav.E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2002.Includes bibliographical references (leaf 47).
by Robert E. Bebermeyer.
Nav.E.
S.M.
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Inglefield, Heather Elizabeth. "Misfit accomodation in thin films of Ni/Cu as measured by magnetic anisotropy." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/32659.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1995.Includes bibliographical references (leaves 134-137).
by Heather Elizabeth Inglefield.
Ph.D.
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Megson, Christopher. "Martyr, misfit, monster : the staging of the politician in British theater since 1968." Thesis, Royal Holloway, University of London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252106.
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Wang, Xu. "The importance of customization on the acceptance of the enterprise resource planning (ERP) system in Chinese company." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAG018/document.
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Les systèmes ERP ont été largement étudiés au cours des dernières décennies, mais ils échouent souvent à offrir les avantages prévus initialement attendus. L'une des raisons est le manque de compréhension comment la personnalisation influence l’acceptation de l’utilisateur ERP par manque d'ajustement du système-à-business, ce qui peut conduire à des résultats négatifs de business. Pour certaines raisons, beaucoup ont fait valoir qu'une mise en oeuvre de ‘vanille’, à savoir sans personnalisation, est la «meilleure» façon de mettre en œuvre des systèmes ERP. Cependant, grâce à la recherche quantitative sur la base de sondage sur le Web, cette thèse a révélé que, en Chine, la personnalisation est une condition nécessaire dans l'acceptation de l'ERP et la réussite du projet. Étant donné d’une variété de risques dans le projet ERP, financier, technique, fonctionnel et politique, les fournisseurs et les consultants sont prêts à aider le chef de projet pour respecter le budget et le temps cible plutôt que de récolter plus d'avantages pour la performance des entreprises. Ainsi, la personnalisation habituellement avait été évitée, et la personnalisation insuffisante est plus fréquente que la personnalisation excessive. Nous avons proposé 15 hypothèses et 11 ont été soutenus, et la conclusion générale que, le niveau de personnalisation a une influence positive considérable sur l'intention comportementale, plus le niveau de personnalisation est élevé, plus l'intention comportementale (BI) à utiliser le système est élevée. C’est une instruction pour les entreprises dans lesquelles le bon niveau de personnalisation (CL) devrait être réalisé au lieu d'éviter la personnalisation. Et seulement la personnalisation importante stratégique plus élevée devrait être inclue dans le projet quand il y a la limitation dans le budget et le temps. Nous avons également confirmé que la facilité de personnalisation est un facteur important dans le choix de la solution ERP correcte. En tant que modérateur, différents rôles ont différentes perceptions sur la personnalisation, les utilisateurs normaux ont une espérance plus forte dans la personnalisation, il est donc essentiel d'expliquer aux utilisateurs, quelle personnalisation est stratégique, et quelle personnalisation est à des fins de cohérence et pourrait compromettre le bénéfice réel de l'ERP système. S'il ne convient pas de faire la personnalisation dans la phase de mise en oeuvre du projet, un plan pour la personnalisation future du système doit être préparé et il améliorera finalement le succès du système à long termeERP systems have been widely studied during the past decades, yet they often fail to deliver the intended benefits originally expected. One notable reason is the lack of understanding how the customization influence the ERP user acceptance when there is lack of system-to-business fit, which can lead to negative business outcomes. For some reasons, many have argued that a "vanilla" implementation, i.e. without customization, is the "best" way to implement ERP systems. However, through quantitative research based on web survey, this dissertation revealed that, in China, customization is a must in ERP acceptance and project success. Because of the various risks in ERP project, financial, technical, functional and political, vendors and consultants are keen on helping the project manager to meet the budget and time target rather than to reap more benefit for business performance. Thus, customization usually had been avoided, and insufficient customization are more common than over customization. We proposed 15 hypothesis and 11 were supported, and the general conclusion that, customization level has significant positive influence on behavioral intention, the higher customization done, the higher behavioral intention (BI) to use the system. It is an instruction for companies that, right level of customization (CL) should be achieved instead of avoiding customization. And only higher strategic important customization should be included in the project when there is limitation in budget and time. We also confirmed that ease of customization is an important factor in selecting the right ERP solution. As a moderator, different role have different perception on customization, normal users have stronger expectancy in customization, so it is critical to explain to the users, which customization is strategic, and which one is for consistency purpose and could jeopardize the real benefit of ERP system. If it is not appropriate to do the customization in the project implementation phase, a plan for future system customization should be prepared and it will ultimately improve the system long term success
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Urwin, Kate. "Adapting to the impacts of climate change in the UK : policy fit and misfit." Thesis, University of East Anglia, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426343.
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Garbrecht, Magnus [Verfasser]. "Aberration-corrected high resolution electron microscopy of the misfit layered compound (PbS)1.14NbS2 / Magnus Garbrecht." Kiel : Universitätsbibliothek Kiel, 2009. http://d-nb.info/1019812605/34.
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Brandes, Kirsten. "Probleme des Cultural Misfit in einer globalisierten Arbeitswelt grenzüberschreitende Akquisitionen und Zusammenarbeit im interkulturellen Kontext." Hamburg Kovač, 2008. http://d-nb.info/993422705/04.
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Chudo, Hiroyuki. "125Te NMR study of misfit CDW states in rare earth tellurides RTe3 (R=La, Ce)." 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/136789.
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MacPherson, Glyn. "Distribution and control of misfit dislocations in indium gallium arsenide layers grown on gallium arsenide substrates." Thesis, University of Liverpool, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318239.
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Messinese, Danilo. "Morphological instability analysis of a misfit strained core-shell nanowire for the growth of quantum dots." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7159/.
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Nell'ambito delle nanostrutture, un ruolo primario è svolto dai punti quantici. In questo lavoro siamo interessati all'analisi teorica del processo di creazione dei punti quantici: esso può avvenire per eteroepitassia, in particolare secondo il metodo studiato da Stranski-Krastanov. Un film di Germanio viene depositato su un substrato di Silicio in modo coerente, cioè senza dislocazioni, e, a causa del misfit tra le maglie dei due materiali, c'è un accumulo di energia elastica nel film. A una certa altezza critica questa energia del film può essere ridotta se il film si organizza in isole (punti quantici), dove la tensione può essere rilassata lateralmente. L'altezza critica dipende dai moduli di Young (E, υ), dal misfit tra le maglie (m) e dalla tensione superficiali (γ).
Il trasporto di materiale nel film è portato avanti per diffusione superficiale.
Il punto focale nell'analisi delle instabilità indotte dal misfit tra le maglie dei materiali è la ricerca delle caratteristiche che individuano il modo di crescita più rapido dei punti quantici. In questo lavoro siamo interessati ad un caso particolare: la crescita di punti quantici non su una superficie piana ma sulla superficie di un nanofilo quantico a geometria cilindrica. L'analisi delle instabilità viene condotta risolvendo le equazioni all'equilibrio: a tal fine sono state calcolate le distribuzioni del tensore delle deformazioni e degli sforzo di un nanofilo core-shell con una superficie perturbata al primo ordine rispetto all'ampiezza della perturbazione.
L'analisi è stata condotta con particolari condizioni al contorno ed ipotesi geometriche, e diverse scelte dello stato di riferimento del campo degli spostamenti.
Risolto il problema elastico, è stata studiata l'equazione dinamica di evoluzione descrivente la diffusione di superficie.
Il risultato dell'analisi di instabilità è il tasso di crescita in funzione del numero d'onda q, con diversi valori del raggio del core, spessore dello shell e modo normale n, al fine di trovare il più veloce modo di crescita della perturbazione.
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Heideman, Colby Luke 1979. "Families of metastable misfit layered compounds prepared by modulated elemental precursors and the resulting physical properties." Thesis, University of Oregon, 2010. http://hdl.handle.net/1794/10877.
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xix, 141 p. : ill. (some col.) A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number.The constant drive to improve material properties has recently led researchers towards metastable nanostructured materials, increasing the need for new synthetic pathways capable of rationally accessing targeted compounds. A method is demonstrated for using physical vapor deposition to create elementally modulated precursors targeting specific compounds. Controlling the modulation length scale of the precursor allows entire families of misfit layered compounds to be synthesized with atomic level control of the structure. Over 100 new misfit layered compounds were synthesized in the [(BiSe) 1.10 ] m (NbSe 2 ) n , [(PbSe) 1.10 ] m (NbSe 2 ) n , [(PbSe) 1.00 ] m (MoSe 2 ) n , and [(SnSe) 1.10 ] m (MoSe 2 ) n , families. The three-dimensional structures of these compounds are examined. These materials are shown to form turbostratically disordered sheets of transition metal dichalcogenide layers interwoven between blocks of rock salt layers. These layers have very small in-plane grain sizes on the order of 10 mn. The interfaces between these layers lack any epitaxial relationship and yet are atomically abrupt and indicate no strain present. The unique metastable structures lead to fascinating properties in these compounds. The turbostratic disorder leads to extremely low thermal conductivity perpendicular to the layering. Thermal conductivities as low as 0.07 W/m/K were measured. Because of the flexible chemistries, a wide range of electrical properties are accessible in these materials, with electrical conductivities ranging from metallic to semiconducting and carrier concentrations ranging from 10 17 to 10 21 cm -3 . Despite the small grain sizes, respectable mobilities have also been measured, up to 21 cm 2 V -1 s -1 . This work consists, in part, of previously published and coauthored material.
Committee in charge: James Hutchison, Chairperson, Chemistry; David Johnson, Advisor, Chemistry; David Tyler, Member, Chemistry; Geraldine Richmond, Member, Chemistry; Richard Taylor, Outside Member, Physics
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Linde, Ida, and Caroline Svedberg. "Misfit – Impact on Porcelain Fracture and Screw Loosening of Implant-supported FDPs - A Laboratory Pilot Study." Thesis, Malmö högskola, Odontologiska fakulteten (OD), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-19948.
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Syfte: Syftet med denna laborativa pilotstudie var att undersöka huruvida en misfit mellan ettimplantat och en skruvretinerad bro ökade risken för sprickor och chip-off frakturer i porslinet, samt risken för uppskruvning av implantatskruvarna.Material och metod: Tjugo stycken implantatstödda skruvretinerade femledsbroar tillverkades i titan med ytporslin. Provkropparna fördelades lika mellan en testgrupp och en kontrollgrupp. I testgruppen skapades en misfit på 150 μm mellan bron och implantatet vid position 5.Provkropparna genomgick artificiellt åldrande i en cyklisk belastningsmaskin i 100 000 cykler.Synliga sprickor och chip-off frakturer noterades under och efter testet och skruvarna kontrollerades gällande uppskruvning.Resultat: Synliga sprickor i porslinet uppstod signifikant mer frekvent i testgruppen i jämförelse med kontrollgruppen. Nio broar i testgruppen uppvisade sprickor jämfört med en bro i kontrollgruppen. Tre chip-off frakturer uppstod i testgruppen jämfört med noll i kontrollgruppen, skillnaden var inte statistiskt signifikant. Vid kontroll av implantatskruvarna sågs inga signifikanta skillnader mellan varken implantatpositioner eller grupper gällande retorque-värde. Inga av skruvarna var lösa.Slutsats: Inom denna studies begränsningar tyder resultaten på att närvaron av en misfit mellan implantat och överkonstruktion kan öka risken för sprickbildning och/eller chip-off frakturer. Vidare studier krävs för att bekräfta dessa resultat.Aim: The aim of this laboratory pilot study was to investigate whether a misfit between an implant and a FDP increase the risk of cracks, chip-off fractures and screw loosening of screw-retained implant-supported FDPs.Material and Method: Twenty screw-retained five-unit implant-supported FDPs were made intitanium with veneering porcelain. The specimens were evenly distributed into a test and control group. In the test group a misfit of 150 μm was created between the implant and FDP at position 5. All specimens underwent artificial aging in a cyclic loading machine for 100 000 cycles. Visible cracks and chip-off fractures were recorded during and after the test and the specimens were controlled for screw loosening.Results: Visible cracks within the porcelain veneer occurred significantly more often in the test group compared to the control group. Nine FDPs in the test group presented visible cracks, compared to one in the control group. Three chip-off fractures were recorded in the test group, none in the control group. This difference was not statistically significant. The retorque values of the screws presented no statistical significant differences neither between the implant positions nor the groups. None of the screws in the groups were loose.Conclusion: Within the limitations of this pilot study the results indicate that the presence of amisfit may increase the risk of cracking and/or chip-off fractures. Further studies are needed to confirm these findings.
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Aziz, Mohsin. "Electrical characterization of III-V antimonide/GaAs heterostuctures grown by Interfacial Misfit molecular beam epitaxy technique." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/14287/.
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Lattice mismatched heterostructures grown by Interfacial Misfit (IMF) technique, which allows the strain energy to be relieved both laterally and perpendicularly from the interfaces, are investigated. However, electrically active defects are created at the interface and away from the interface with energy levels deep in the bandgap of the host materials. These defects dramatically affect the optical and electrical properties of the devices. In this thesis, an investigation of deep level defects is carried out on GaSb/GaAs uncompensated and Te compensated heterostructures grown by the IMF method using DLTS, Laplace DLTS, I-V, C-V, C-F and C-G-F measurements. Furthermore, the effect of thermal annealing treatments on the defect states is also studied on both types of samples. It was found that the well-known EL2 electron trap is commonly observed near to the interface of both uncompensated and Te compensated GaSb/GaAs IMF samples. However, several additional electron defects are detected in Te compensated samples. Rapid thermal annealing performed on uncompensated samples resulted in the annihilation of the main electron trap EL2 at a temperature of 600 oC. On the other hand rapid thermal annealing and conventional furnace annealing were carried out on Te compensated samples, and it was observed that rapid thermal annealing process is more effective in terms of defects reduction. The density of interface states is determined from C-G-F and forward bias DLTS measurements. Te compensated samples exhibit the highest density of interface states and have additional hole traps as compared to uncompensated samples. The electrical properties of p-i-n GaInAsSb photodiodes grown on uncompensated and Te compensated GaSb/GaAs templates on GaAs substrates using special growth mode are investigated. The non-radiative defects which could have detrimental effects on the performance of these photo diodes are studied here for the first time. Both electron and hole defects are detected, and their capture cross-section measurements reveal that some of defects originate from threading dislocations. The double pulse DLTS measurements are performed and the concentration distributions of the detected defects are determined.
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Brown, Michal A. Rosakis Ares J. "Measuring stress in thin film-substrate systems featuring spatial nonuniformities of film thickness and/or misfit strain /." Diss., Pasadena, Calif. : Caltech, 2007. http://resolver.caltech.edu/CaltechETD:etd-06042007-171342.
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Merrill, Devin. "Stability, Reactivity, and Constituent Interaction in TiSe2-Based Metastable Misfit Layer Compounds Synthesized from Designed Amorphous Precursors." Thesis, University of Oregon, 2016. http://hdl.handle.net/1794/19713.
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A series of intergrowth compounds with the basic formula [(MSe)1+δ]m(TiSe2)n are reported. The compounds are prepared from modulated elemental reactants and display interesting structural and electronic behavior. Section 1 of this dissertation outlines initial attempts to characterize constituent interaction. The first member of the SnSe based subclass is reported and displays the highest Seebeck coefficient of any m = n = 1 compound reported to date, and a surprising amount of order is observed, compared to previously reported compounds. With properly established deposition parameters, the synthesis was extended to included the m = 2-4 compounds. These compounds display interesting electronic behavior that suggests the band structure shifts considerably as the SnSe block is expanded, affecting the interaction between the constituent layers. The first compound based on BiSe is then reported, suggesting that the Bi structure donates more conduction electrons to the band structure.
Targeted substitution through kinetic control is the focus of Section 2, and a family of (PbxSn1-xSe)1+δTiSe2 is reported over the entire range of x, even though a miscibility gap exists in the bulk PbxSn1-xSe system. The resulting alloyed intergrowth compounds also display equal or higher mobility than the end members, suggesting modulation doping could be used to affect transport properties. As a proof of principle, the analogous system based on a BixSn1-xSe constituent was prepared to attempt to systematically affect carrier concentration. It was found that while carrier concentration can be controlled, the evolving structure affects the doping efficiency of the Bi atoms and mobility in the structure.
Section 3 outlines attempts to form higher order TiSe2-based heterostructures and the important chemical considerations observed during the preparation of these materials. The 3 component systems in the Pb-Sn-Ti-Se system can be formed at low temperature, with SnSe2 rather than SnSe. While at higher temperatures, topotactic reactions occur, causing rearrangement to the alloyed rocksalt structure. Compounds within the alloy system with m > 1 are presented which show surface segregation of Pb atoms, and a designed experiment suggests this is a thermodynamic effect.
This dissertation includes previously published and unpublished coauthored material.
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Sun, Yinghao. "Constructing a Misspecified Item Response Model That Yields a Specified Estimate and a Specified Model Misfit Value." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1449097866.
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Oberhausen, Tammy. "The Southern Misfit and the Dream of Escape in the Fiction of Carson McCullers and Flannery O’Connor." TopSCHOLAR®, 1990. http://digitalcommons.wku.edu/theses/1791.
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The misfit and the dream of escape are popular motifs in American literature, particularly in the literature of the South. Critical studies of works employing these themes have largely ignored the connection between the two. The Southern misfit – the Southerner who fails to or refuses to conform to his society’s strict standards – often dreams of escaping the restrictions of the South for some Northern “promised land.” In the works of two Georgia writers, Carson McCullers and Flannery O’Connor, the related themes receive different treatments. Carson McCullers’s misfits in the novels The Heart is a Lonely Hunter and The Member of the Wedding are adolescent girls who fail to meet their society’s expectations to be ladylike and free of personal ambitions, and McCullers seems sympathetic to her misfits’ longing to escape. In Flannery O’Connor’s short stories, her misfits are often intellectuals who feel unappreciated and alienated in their “culturally stagnant” hometowns, but O’Connor usually demonstrates that the real problem of these intellectuals is not the restrictions of the South but the characters’ own lack of self-awareness.
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Cansdale, Sophie. "From misfit to monster : a study of the anti-hero in post-World War II United States novel." Thesis, University of Essex, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.572786.
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This thesis is a study of the white male anti-hero in post-World War II United States fiction. It is my intention to analyse the manners in which surrounding sociocultural systems are integral to both the construction of deviance and social responses to it. Varying attitudes towards the deviant during this period were shaped by a wide variety of factors, such as the increasing assimilation of psychoanalysis into popular consciousness, the Sexual Revolution and counter-culture of the 1960s, the rapid rise of consumerism and mass culture and the growth of sociology and criminology as diagnostic tools in managing deviance during these years. This will frequently involve a heavy emphasis on the pertinence of these issues to post-World War II concepts of masculinity, as the rise of second-wave feminism opened up the interrogation of gender roles and their accompanying pressures and privileges. I will also examine the presence of deviance as a matter of narrative form in the work of authors such as William Burroughs and Jack Kerouac, and the relationship between the formal experimentation of artistic movements and the response to the relevant facets of post- World War II society contained within them. I argue that deviance in the post-World War II United States novel is most commonly represented as both a reaction to and an extension of sociocultural formations, which the figure of the anti-hero simultaneously embodies and repudiates. It is my intention to examine nine texts from this period, and to analyse the manners in which deviance is represented within the context of post-war United States culture, drawing upon a variety of contextual and theoretical approaches as appropriate. I hope to move towards establishing a shared basis between these nine novels, which differ widely in terms of context, concerns and narrative form, in terms of their treatment of deviance.
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Radovsky, Gal, Ronit Popovitz-Biro, Tommy Lorenz, Jan-Ole Joswig, Gotthard Seifert, Lothar Houben, Rafal E. Dunin-Borkowski, and Reshef Tenne. "Tubular structures from the LnS–TaS₂ (Ln = La, Ce, Nd, Ho, Er) and LaSe–TaSe₂ misfit layered compounds." Royal Society of Chemistry, 2016. https://tud.qucosa.de/id/qucosa%3A36272.
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Nanotubular structures from a new family of misfit compounds LnS–TaS₂ with (Ln = La, Ce, Nd, Ho, Er) and LaSe–TaSe₂ (some of them not known hitherto) are reported. Stress relaxation originating from the lattice mismatch between the alternating LnS(Se) and TaS₂(Se) layers, combined with seaming of the dangling bonds in the rim, leads to the formation of a variety of nanotubular structures. Their structures are studied via scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), scanning transmission electron microscopy (STEM) and selected area electron diffraction (SAED). Tubules exhibiting a single folding vector for the LnS(Se) as well as TaS₂(Se) layers were often found. The small values of the c-axis periodicities are indicative of a strong interaction between the two constituent layers which was also supported by Raman spectroscopy and theoretical calculations.
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Johnston, Geoffrey R. "Comparison of Vertical Misfit Between Pattern Resin and Welded Titanium Used to Fabricate Complete-Arch Implant Verification Jigs." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1499779684903305.
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Honn, Darla Dawn. "AN EXPLORATION OF THE EFFECTS OF COGNITIVE MISFIT ON THE RELATIONSHIP BETWEEN PROBLEM-SOLVING ABILITY AND ACCOUNTING TASK PERFORMANCE." OpenSIUC, 2011. https://opensiuc.lib.siu.edu/dissertations/316.
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Cognitive ability has been identified as a factor which is associated with accounting expertise, yet little is known about its effects on accounting task performance. The widely-accepted model of accounting performance proposed by Libby and Luft (1993) predicts that cognitive ability influences accounting performance directly and indirectly by affecting task-specific knowledge. Empirical inconsistencies found in these relationships are largely unexplored in the accounting literature, and so a complete understanding of the ability~performance relation remains elusive. The psychology literature suggests that cognitive style, as well as cognitive ability, contributes to the cognitive processes that underlie accounting performance. Research has shown that cognitive style can affect accounting performance, particularly under conditions of cognitive misfit (Chan 1996). Cognitive misfit occurs when an accountant's cognitive style interacts with incongruent demands of the accounting task. Theory suggests the condition of cognitive misfit may explain empirical inconsistencies found in prior ability~performance research. The existing accounting literature has not investigated how cognitive misfit impacts the ability~performance relationship in accounting tasks. The current study explores how the condition of cognitive misfit affects direct and indirect relationships between cognitive ability and accounting performance proposed in the Libby and Luft (1993) performance model. The new knowledge generated in this research will benefit the accounting profession in its quest to identify the determinants of expert performance.
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Grippa, Alexander. "Structural investigation of Nb-based layer sulfides." Doctoral thesis, Stockholm University, Department of Physical, Inorganic and Structural Chemistry, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-177.
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In this work we have investigated the intercalation of electron-donors between NbS2 slabs in Nb-based layer sulfides.
Two series of Sr substituted Nb-based misfit sulfides belonging to the 1.5Q/1H and 1Q/1H series of misfit layer compounds have been synthesised. For large lanthanides (Ln=La, Ce), only the 1Q/1H compounds formed whereas for smaller lanthanides and yttrium, both types of phases can be obtained. The crystal structure of misfit sulfide (Pr0.55Sr0.45S)1.15NbS2 has been refined using the composite approach. In the Q-slab, Pr-atoms are partly replaced by Sr with a random distribution over one cation position. The crystal structure of misfit sulfide [(Sm1/3Sr2/3S)1.5]1.15NbS2 belonging to the 1.5Q/1H series have also been determined. The obtained results suggest a preferred occupancy of the cation positions in the slab where Sr atoms mainly occupy positions on the exterior of the slab while Sm atoms are in the center of the slab. The (La1-xSrxS)1.15NbS2 solid solution (0.1 An attempt to synthesize SrxNbS2 (0.1≤x≤0.5) intercalates was made but single phases were not obtained and increasing the temperature from 1000оС to 1100оС leads to the decomposition of these intercalates. Single crystals of Sr0.22Nb1.05S2 and Sr0.23NbS2 were found and their structures were determined. The structures belong to two different types of packings with statistical distribution of Sr between layers. A new superconducting sulfide, "EuNb2S5", was investigated by ED and HREM and its structure model consisting of Nb7S14 and (Eu3S4)2 slabs alternating along the c-axis is suggested. An attempt to suggest a model for the structure of "SrNb2S5" by means of X-ray single crystal diffraction was made. The proposed structure consists of two types of slabs: a Nb7S14 and a [Sr6(NbS4)2S] slab with niobium in tetrahedral coordination. It is shown that "SrNb2S5" and "EuNb2S5" are have similar structures. For the first time, single crystals of the complex sulfide BaNb0.9S3 have also been studied by means of X-ray single crystal diffraction. The single crystal refinement and EDX analysis showed the existence of cation vacancies at the niobium position. BaNb0.9S3 has also been studied by ED and no superstructure was found which implies that and the vacancies are statistically distributed. No improvement of the magnetic properties of the studied compounds was observed in comparison to NbS2.
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Kalläne, Matthias [Verfasser]. "Towards angle and space resolved photoemission : bonding in layered misfit compounds and development of reflective photon sieves / Matthias Kalläne." Kiel : Universitätsbibliothek Kiel, 2010. http://d-nb.info/1019952067/34.
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Hendrickson, Mandana. "The Role of Misfit Strain and Oxygen Content on Formation and Evolution of Omega Precipitate in Metastable Beta-titanium Alloys." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc955080/.
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β-Ti alloys are widely used in airframe and biomedical applications due to their high ductility, high hardenability, and low elastic modulus. The phase transformations in β-Ti alloys are rather complex due to formation of metastable phases during various thermo-mechanical treatments. One such critical metastable phase, the hexagonal omega (ω) phase, can form in β-Ti alloys under quenching from the high temperature β phase and/or isothermal aging at intermediate temperature. Despite a substantial amount of reported works on the ω phase, there are several critical issues related to the ω formation need to be resolved, e.g. role of alloying elements and oxygen content. Therefore, this dissertation has attempted to provide insights into ω transformation in low misfit (Ti-Mo) and high misfit (Ti-V) binary systems as well as multicomponent (Ti-Nb-Zr-Ta) alloys.
The evolution of ω structure, morphology and composition from the early stage (β-solution+quenched) to later stages after prolonged aging are systematically investigated by coupling transmission electron microscopy (TEM), atom probe tomography (APT) and high-energy synchrotron X-ray diffraction techniques. The influence of aging temperature and duration on characteristic of ω phase in Ti-Mo, and Ti-V alloys is addressed in details. It is found that compositional changes during aging can alter the structure, size and morphology of ω precipitates. In low misfit alloys, the ellipsoidal morphology of ω phase was retained during isothermal aging, while in high misfit alloys it changed from ellipsoidal to cuboidal morphology after prolonged aging. Secondly, ω transformation in biomedical Ti-Nb-Zr-Ta alloy is probed in which the micro-hardness was sensitive to microstructural changes. Furthermore, the evolution of oxygen concentration in ω precipitates during various aging conditions in binary Ti-Mo and Ti-V alloys are reported. It has been accepted that interstitial elements such as oxygen can largely alter mechanical behavior and the microstructure of Ti-alloys. Recently, oxygen is intentionally added to some biomedical alloys to improve their performances. However, a careful understanding of the effect of oxygen on ω phase transformation is still lacking in the literature. In this work, the role of oxygen on ω phase formation in biomedical TNTZ alloys is investigated. Although it is traditionally accepted that oxygen suppresses ω transformation, our observations revealed contradictory results during isothermal aging of TNZT alloys. The results of our investigations provide a novel insight into understanding the effect of interstitial elements on metastable phase transformation in β-Ti alloys. It is concluded that depending upon the nature of alloying elements and/or the applied thermo-mechanical treatments, oxygen may play a different role in ω transformations.
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Tili, Nikta, and Lina Holmbom. "Effect of implant angulation on possible misfit between implant and abutment - an experimental pilot study using two different measuring techniques." Thesis, Malmö högskola, Odontologiska fakulteten (OD), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-19904.
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Sammanfattning Syfte. Misfit kan uppstå mellan implantat och distans eller restoration. Om orsaker till misfit kan identifieras kan risker för tekniska komplikationer minimeras genom att tillhandhålla information om hur misfit kan undvikas. Syftet är att undersöka om misfit uppstår vid avtryckstagning på implantatnivå med vinklade implantat.Material och metod. Fyra mastermodeller med två implantat med följande inbördes vinklar; 0o, 10o, 20o och 30o framställdes. Fem avtryck på implantatnivå togs på respektive mastermodell med polyeter. Totalt 20 gipsmodeller framställdes. Kuldistanser monterades på master- och gipsmodell. Två mätmetoder användes för att mäta misfit; ImageJ (IJ) och digital mikrometer (DM). Samtliga modeller fotograferades och infördes i mätprogrammet ImageJ för mätning av avståndet mellan de yttersta punkterna på kuldistanserna. Samma avstånd mättes sedan med ett digital mikrometer. Misfit räknades ut genom differensen mellan mastermodell och gipsmodell i respektive grupp. One-way variansanalys och Tukey’s test användes för statistisk analys.Resultat. Operatör 1 erhöll störst misfit i IJ10°-gruppen och DM20°-gruppen och operatör 2 erhöll störst misfit i IJ30°-gruppen och DM0°-gruppen. Det finns en signifikant skillnad i 10°-gruppen för både operatörerna. (P <0,05).Slutsats. Denna studie visar inget linjärt samband mellan ökad vinkel på implantaten och misfit och det finns tydliga operatörsskillnader vid mätning. De två mätmetoderna är likvärdiga med undantag för 10o-gruppen.AbstractAim.Misfit may occur between implant and abutment or restoration. If the causes of misfit can be identified, the risk of technical complications may be minimized by providing information about how to avoid misfit. The purpose of this present laboratory study is to investigate if misfit occurs when making implant-level impression with angulated implants.Materials and methods. Four master models with two implants with the following mutual angles; 0o, 10o, 20o and 30o were fabricated. Five impressions were made on implant level on each master model using polyether. Totally 20 cast models were made. Ball abutments were mounted on the master and cast models. Two methods of measurement were used to measure misfit; ImageJ (IJ) and a digital micrometer (DM). All models were photographed and transferred into the measurement program, ImageJ to measure the distance between the outermost points of the ball abutments. The same distance was measured using a digital micrometer. Misfit was calculated by the difference between the master model and the cast model in each group. One-way analysis of variance and the Tukey’s test were used for statistical analysis. Results. Operator 1 received greatest misfit in the IJ10°-group and DM20°-group and operator 2 received greatest misfit in the IJ30°-group and the DM0°-group. There is a significant difference in the 10°-group for both operators. (p < 0.05).Conclusion. This study shows no linear pattern between increased angle of the implants and misfit and there are clear operator variations during measurement. The two measurement methods are equivalent except for the 10o-group.
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Morquin, David. "Comment améliorer l’usage du Dossier Patient Informatisé dans un hôpital ? : vers une formalisation habilitante du travail intégrant l’usage du système d’information dans une bureaucratie professionnelle." Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTD005/document.
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L’objet principal de cette thèse concerne le Dossier Patient Informatisé (DPI) dans les hôpitaux, et plus particulièrement les difficultés d’usage après la phase d’implémentation. Notre démarche visait à concevoir, à partir des connaissances académiques en Système d’Information, une méthode permettant aux acteurs de terrain d’agir sur une problématique spécifique. Concrètement nous cherchions à savoir comment améliorer les situations de « misfit », c’est à dire les situations dans lesquelles les professionnels de santé considèrent l’usage du DPI comme inadapté à leur métier. Pour ce faire, nous avons cherché à comprendre le bilan mitigé du DPI dans la littérature en utilisant les travaux d’Adler & Borys (1996) sur le caractère dual de la formalisation du travail induite par la technologie (habilitante ou coercitive). Une technologie habilitante permet de positionner un utilisateur comme source de solutions, alors qu’une technologie coercitive tend à le considérer comme source de problèmes. Dans le premier manuscrit portant sur l’autonomie des professionnels de santé face au système d’information hospitalier, nous avons conclu sur la nécessité d’une formalisation de type habilitante pour améliorer l’usage du DPI. Dans le deuxième manuscrit, nous avons montré que dans les exemples d’expériences négatives du Dossier Patient Informatisé rapportés dans la littérature, il était possible de mettre en évidence les différents aspects d’une formalisation coercitive. Pour argumenter sur le caractère dual de la formalisation du travail induite par le DPI, nous avons rapporté dans le troisième manuscrit une étude empirique illustrative. Nos données montrent que pour un même DPI, dans un même hôpital, il peut exister des îlots de formalisation habilitante. En sortant du seul domaine d’application de la santé, nous avons approfondi les travaux sur la conceptualisation du misfit entre processus d’affaires et Système d’Entreprise (SE) de Strong & Volkoff de 2010, en utilisant les concepts d’affordance et d’actualisation d’affordance utilisés par les mêmes auteurs en 2013 et 2014. Le quatrième manuscrit présente donc un modèle original permettant d’analyser l’usage des technologies de l’information pour un processus d’affaires donné sous la forme d’une combinaison d’actualisations, de non-actualisation ou d’actualisations partielles de multiples affordances du système d’entreprise par de multiples acteurs. Dans une perspective réaliste critique, le misfit est alors la perception par un individu ou un groupe d’individus que cette combinaison ne répond pas à l’ensemble ou à une partie des objectifs du processus de façon satisfaisante. Nous rapportons ensuite comment, dans le cadre d’une recherche-action, nous avons utilisé ce modèle pour améliorer l’usage d’un DPI en post-implémentation dans un hôpital. L’analyse d’une situation de misfit selon notre méthode permet une recombinaison, en recherchant une suite cohérente d’ajustements techniques et organisationnels acceptables pour toutes les parties prenantes et dont l’agencement permet bien la disparition du misfit initial, mais aussi de l’ensemble des misfits révélés pendant l’analyse. Cette recombinaison aboutit alors à une formalisation du travail présentant toutes les caractéristiques d’une formalisation habilitante.La discussion de la thèse aborde les conditions du succès de la méthode, le choix des situations sur lesquelles l’appliquer et les perspectives de recherche qui en découlentThe main focus of this thesis is the Electronic Patient Record (EPR) in hospitals, and more particularly the difficulties of use after the implementation phase. Our approach aimed to design, with the academic knowledge of Information Systems, a method allowing field actors to act on this specific issue. In concrete terms, we were looking for ways to improve "misfit" situations, i.e. situations in which health professionals consider the use of EPR to be unsuitable for their profession. To do this, we sought to understand the mixed record of EPR use reported in the professional literature, by using the dual nature (enabling or coercive) of technology-induced work formalization (Adler & Borys, 1996). Enabling technology allows a user to be positioned as a source of solutions, while coercive technology tends to consider them as a source of problems. In the first manuscript on the autonomy of health professionals in relation to the hospital information system, we concluded that an enabling formalization is needed to improve the use of EPR. In the second manuscript, we showed that in the examples of negative experiences of the EPR reported in the literature, it was possible to highlight the different aspects of coercive formalization. To argue on the dual nature of the formalization of work induced by EPR, we have reported in the third manuscript an illustrative empirical study. Our data show that for the same EPR, in the same hospital, there may be islets of enabling formalization.Moving beyond the health field of application alone, we have further developed Strong & Volkoff's 2010 conceptualization of the misfit between business process and Enterprise System (ES), using the concepts of affordance and affordance-actualization used by the same authors in 2013 and 2014.The fourth manuscript therefore presents an original model for analyzing the use of information technology for a given business process in the form of a combination of actualizations, non-actualizations or partial actualizations of multiple affordances of the enterprise system by multiple actors. From a critical realistic perspective, misfit is then the perception by an individual or group of individuals that this combination does not satisfactorily meet all or some of the objectives of the process.We then report on how we used this model to improve the use of EPR in post-implementation in an action research project. The analysis of a misfit situation according to our method allows a recombination, by seeking a coherent sequence of technical and organizational adjustments acceptable to all stakeholders and whose arrangement allows the disappearance of the initial misfit, but also of all the misfits revealed during the analysis. This recombination then leads to a formalization of the work that has all the characteristics of an enabling formalization.The discussion of the thesis addresses the conditions for the success of the method, the choice of situations on which to apply it and the resulting research perspectives
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Lencioni, Karina Albino. "Avaliação da adaptação marginal em pilares pré-fabricados e das tensões transmitidas a implantes por infra-estrutura metálica em viga I em função da inclinação dos implantes distais e do número de pilares." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/58/58131/tde-15022012-141246/.
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A ausência do perfeito ajuste e o assentamento passivo dos pilares sobre implantes podem provocar tensões inadequadas na interface de osseointegração, possibilitando problemas mecânicos e biológicos. A fotoelasticidade é uma técnica experimental para análise de tensões capaz de produzir resultados confiáveis e fiéis aos parâmetros clínicos. Assim, este estudo teve como objetivos avaliar por meio de microscopia ótica a adaptação marginal entre pilares intermediários tipo mini pilar cônico e a estrutura metálica com desenho geométrico em viga I fundida com liga de cobalto-cromo (CoCr). Analisaram-se, também, por meio de fotoelasticidade, as tensões geradas ao redor dos implantes por essa mesma estrutura metálica quando submetida a cargas estáticas em função da variação do número de pilares (4 ou 5) e da inclinação dos implantes distais (para o modelo de 5 implantes). As análises foram feitas antes e após o seccionamento das barras e soldagem a laser. Foram obtidas dez infraestruturas em viga I, fundidas em monobloco, utilizando-se liga de cobalto cromo. A análise da adaptação marginal foi realizada em estereomicroscópio sob aumento de 20X. Modelos fotoelásticos para 4 ou 5 implantes foram confeccionados e realizada a mensuração da tensão ao redor dos implantes. As barras foram seccionadas e soldadas por laser e novas medidas de adaptação marginal foram realizadas, bem como foram confeccionados novos modelos fotoelásticos para as estruturas soldadas. A análise da passividade das vigas I em monobloco não se mostrou estatisticamente significante (p≤0,05), a passividade no pilar oposto foi sempre menor que a do pilar parafusado antes e após a soldagem a laser, não houve diferença estatística no desajuste vertical entre as vigas I para quatro e cinco implantes, antes e após a soldagem a laser. A soldagem a laser gerou maior passividade e menor desajuste vertical nas vigas I. A análise fotoelástica mostrou que a soldagem a laser ocasionou menor tensão nos implantes quando não há aplicação de carga na viga I para quatro implantes, mas aumentou a tensão em viga I para cinco implantes. Assim, pode-se concluir que a soldagem a laser gerou maior passividade e menor desajuste vertical entre os pilares e o implante, e menor tensão ao redor dos implantes em vigas I de quatro implantes, e maior tensão em viga I para cinco implantes.The absence of perfect fit and passivity on implants can cause stress on the osseointegration interface, enabling biomechanical problems. Photoelasticity is an experimental technique for stress analysis can produce reliable results and faithful to clinical parameters. Thus, the aim of this study was to assess by light microscopy the marginal adaptation of mini pillar intermediate and superstructure with geometric design I beam with cast cobalt-chromium (CoCr). It was analyzed also by means of photoelasticity, the tensions generated around the implants by the same metal superstructure when subjected to static loads due to the variation in the number of implants (4 or 5) and tilting the distal (for model 5 implants). Analyses were made before and after sectioning of the bars and laser welding. It was obtained ten I-beam superstructure I, cast in cobalt chromium alloy. The analysis of marginal adaptation was performed in a stereomicroscope under magnification 20X. Photoelastic models for 4 or 5 implants were made and carried out the measurement of the tension surrounding the implants. The bars were cut and welded by laser and marginal adaptation of new measures were taken and new photoelastic models were made for welded structures. The analysis of the passivity of the I-beams in a single block was not statistically significant (p≤0.05), passivity on the pillar opposite was always less than the abutment screws before and after laser welding, there was no statistical difference in the vertical misfit between I-beams for four and five implants before and after laser welding. The laser welding has generated greater passivity and lower beams in vertical misfit I. The photoelastic analysis showed that laser welding caused less stress on the implants when there is no application of load over four implants, but increased the tension for five implants. Thus, it can be concluded that laser welding generated more passivity and less vertical fit between the pillars and the implant, and less tension around the implants in four implants, and higher stress for five implants.
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Cario, Laurent. "Stabilite et transfert de charges dans les sulfures type misfit (lns)#1#+#xts#2 de terres rares et de metaux de transition." Nantes, 1998. http://www.theses.fr/1998NANT2099.
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Les composites incommensurables (lns)#1#+#xts#2 avec t = ti,v,cr et ln = terres-rares, peuvent etre consideres comme des materiaux d'intercalation des feuillets lns dans la matrice ts#2. Le fort transfert electronique de lns vers ts#2 (jusqu'a 1+x e#-/t) stabilise la phase misfit par rapport aux composes binaires isoles. Des calculs lmto montrent qu'en depit de l'ajustement des niveaux de fermi, la structure de bandes de ces phases peut se decomposer en la structure de bandes de chaque sous-ensemble pris independamment (modele de bandes rigides). A partir de ces calculs, l'evolution des proprietes et de la non-stoechiometrie des phases misfits obtenues en passant de ti a cr et de la a eu peut etre expliquee. 1- de ti a cr la contraction des orbitales 3d entraine le passage de composes metalliques lntis#3 a des isolants de mott lncrs#3. Pour lncrs#3, le transfert est donc bloque a 1e#/cr ce qui explique la formulation stricte (ln#1#+#2#/#3#xs#1#+#x)crs#2 prealablement revelee par analyse microsonde. Par contre pour lntis#3 le transfert n'est pas fixe, et un domaine de solution solide est observe. Comme attendu, les phases (ln#1##s)#1#+#xvs#2 >0 presentent un comportement intermediaire, avec a la fois un paramagnetisme de pauli et une conductivite non metallique ; en outre des effets non lineaires ont pu etre mis en evidence. 2- d'autre part, de la a eu un abaissement progressif du niveau 4f#n de la terre rare est observe. Pour eu ce niveau plonge sous la bande 3d de l'element t, ce qui empeche tout transfert. Les phases (eus)#1#+#xts#2 avec eu#2#+ ne sont donc pas stables. Il se forme par contre le compose misfit (eus)#1#,#5#1#,#1#5nbs#2, dont la partie eus est composee de trois couches atomiques au lieu de deux. La encore, la stabilite de cette phase decoule du caractere reducteur du feuillet eus du a la presence de eu#3#+ en son coeur. Ce travail souligne ainsi les relations etroites unissant stabilite, non-stoechiometrie, transfert de charge et proprietes des phases misfits de terres rares.
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Goley, Patrick Stephen. "Plastic Relaxation of Highly Tensile Strained (100) Ge/InGaAs Heterostructures." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/54944.
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Biaxial tensile strain has been shown to greatly enhance the optoelectronic properties of epitaxial germanium (Ge) layers. As a result, tensile-Ge (and#949t-Ge) layers grown on larger lattice constant InGaAs or GeSn have attracted great research interest. However, no previous studies have investigated the plastic relaxation occurring in these and#949t-Ge layers. Here, we experimentally demonstrate that plastic relaxation occurs in nearly all and#949t-Ge epitaxial layers that are of practical interest for optoelectronic applications, even when layers may still exhibit strain-enhanced characteristics. We show arrays of misfit dislocations (MDs), which are mostly disassociated, form at the and#949t-Ge/InGaAs interface for and#949t-Ge layers as thin as 15 nm with less than 1% total mismatch. Wedge geometry of plain view transmission electron microscopy (PV-TEM) foils is utilized to carry out a depth dependent investigation MD spacing for a range of and#949t-Ge/InGaAs heterostructures. MD spacing measured by PV-TEM is correlated to and#949t-Ge layer relaxation measured by high-resolution x-ray diffraction. We confirm very low relaxation (< 10% relaxed) in and#949t-Ge layers does not imply they have been coherently grown. We demonstrate plastic relaxation in the and#949t-Ge layer is acutely sensitive to grown-in threading dislocations (TDs) in the template material, and that reducing TD density is critical for maximizing strain retention. Given that and#949t-Ge layer thicknesses of 150+ nm with greater than 1% tensile strain are desired for optoelectronic devices, this work suggests that MDs may inevitably be present at and#949t-Ge/InGaAs heterointerfaces in practical devices, and that the effect of MDs on optoelectronic performance must be better understood.Master of Science
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Akhlaghi, Maryam [Verfasser], and Eric Jan [Akademischer Betreuer] Mittemeijer. "Precipitation of nitrides in iron-based binary and ternary alloys; influence of defects and transformation-misfit stresses / Maryam Akhlaghi. Betreuer: Eric Jan Mittemeijer." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2016. http://d-nb.info/1082238171/34.
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Sankarasubramanian, R. "Symmetry-Breaking Transitions In Equilibrium Shapes Of Coherent Precipitates." Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/191.
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We present a general approach for determining the equilibrium shape of isolated, coherent, misfitting particles by minimizing the sum of elastic and interfacial energies using a synthesis of finite element and optimization techniques. The generality derives from the fact that there is no restriction on the initial or final shape, or on the elastic moduli of the particle and matrix, or on the nature of misfit. The particle shape is parameterized using a set of design variables which are the magnitudes of vectors from a reference point inside the particle to points on the particle/matrix interface. We use a sequential quadratic programming approach to carry out the optimization. Although this approach can be used to find equilibrium shapes of particles in three dimensional systems, we have presented the details of our formulation for two dimensional systems under plane strain conditions.
Using our formulation, we have studied the equilibrium shapes in two dimensional systems with cubic anisotropy; the precipitate and matrix phases may have different elastic moduli, and the misfit may be dilatational or non-dilatational. The equilibrium shapes and their size dependence are analysed within the framework of symmetry-breaking shape transitions. These transitions are further characterized in terms their dependence on the cubic elastic anisotropy parameter, defined by A = 2C44/(C11 – C12), and on the modulus mismatch, defined by δ=μp/μm, where /μp and μm are the effective shear moduli of the precipitate and matrix phases, respectively. Depending on the type of misfit, the systems may be classified into the following four cases:
Case A: For dilatational misfit, the equilibrium shapes in isotropic systems are circular (with an isotropic or I symmetry) at small sizes and undergo a transition at a critical size to become ellipse-like (with an orthorhombic or O symmetry). This I --O transition is continuous and is obtained only when the precipitate phase is softer than the matrix. These results are in good agreement with the analytical results of Johnson and Cahn.
In cubic systems with dilatational misfit, the particles exhibit a transition from square-like shapes (with a tetragonal or T symmetry) at small sizes to rectangle-like shapes (with an O symmetry) at large sizes. This T -- O transition is continuous. It occurs even in systems with stiffer precipitates; however, it is forbidden for systems with δ >δC, where δ C represents a critical modulus mismatch. The critical size decreases with increasing cubic anisotropy (i.e., with increasing values of (A-1)/(A+1). The sides of the square-like and rectangle-like shapes are along the elastically soft directions.
Case B: In these systems, the principal misfits e*xx and e*yy differ in magnitude but have the same sign. The precipitates at small sizes become elongated along the direction of lower misfit; this shape has an O symmetry. In systems with A > 1, they continue to become more elongated along the same direction, exhibiting no symmetry-breaking transition. However, in systems with A < 1, particles at large sizes are elongated along an intermediate direction between the direction of lower misfit and one of the elastically soft <11> directions; this shape has only a monoclinic or M symmetry. This O - M transition, in which the mirror symmetries normal to the x and y axes are lost, may be discontinuous or continuous. The critical size increases with δ (in the range 0.8 < δ <1.25), indicating that this transition would also be forbidden for systems with δ > δC. In systems with A < 1, the critical size decreases with increasing values of A-1/ A+1
Case C: In these systems, the principal misfits differ in both magnitude and sign, and the misfit strain tensor allows an invariant line along which the normal strain is zero. The precipitates at small sizes are elongated along the direction of lower absolute misfit, and possess an 0 symmetry. At large sizes, the mirror symmetries normal to the x and y axes are broken to yield shapes which are elongated along a direction between that of lower misfit and the invariant line. This 0 -> M transition is continuous and occurs in all the systems irrespective of the value of A The critical size increases with A and decreases with δ.
Case D; The misfit in this case is a special form of that in Case C; the principal misfits have the same magnitude but opposite signs. The precipitates at small sizes have a square-like shape with its sides normal to the < 11 > axes, irrespective of the type of cubic anisotropy. At large sizes, they become rectangle-like with the long axis oriented along one of the <11> directions. Similar to Case C, this T - 0 transition is continuous and occurs in all the systems irrespective of the values of A. The critical size increases with A and decreases with δ.
Thus, we have identified all the symmetry-breaking transitions in equilibrium shapes of coherent precipitates in two dimensional systems. We have identified their origin and nature, and characterized them in terms of their dependence on the anisotropy parameter and modulus mismatch.
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Rogers, Meredith Australian Graduate School of Management Australian School of Business UNSW. "Contingent corporate governance: a challenge to universal theories of board structure." Awarded by:University of New South Wales. Australian Graduate School of Management, 2006. http://handle.unsw.edu.au/1959.4/23024.
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Agency theory proposes that the role of the board of directors is to control management (Fama & Jensen 1983). A structurally independent board, one with a high percentage of non-executive directors and a chairperson who is not the CEO, has been used as a proxy for the control role. Therefore, agency theory predicts a positive relationship between independent board structure and firm performance. These predictions have not been confirmed by meta-analytic reviews (Dalton, Daily, Ellstrand, & Johnson 1998; Rhoades, Rechner, & Sundaramurthy 2000). This thesis applies structural contingency theory to provide an alternative explanation for the relationship between board structure and firm performance. Structural contingency theory (Donaldson 2001) proposes that the relationship between an organization???s structure and its performance is moderated by contingencies. In this study the contingency is the salience of the board???s control role. I argue that structural independence of the board has a beneficial effect on performance only if it is in fit with control salience. For example, a firm with an independently structured board that gives high prominence to the control role will perform well. On the other hand, another firm with a less independently structured board that does not see its main role as controlling management will also prosper. Survey data were analyzed to measure the control salience for 98 Australian listed companies. Archival data provided measures of board structure and firm performance. Consistent with the meta-analytic reviews, there was no association between independent board structure and firm performance. There was some evidence that high control salience resulted in high performance, but this effect was evident chiefly when performance was measured by total shareholder returns. This may indicate that the share market was responding to the symbolism of high control salience. In contrast to the symbolic main effect of control salience, the fit between the control salience and the independent structure of the board caused increased return on equity. This reflects the board???s objective effect on profit when its structure is in fit with control salience.
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Levasseur, Caio Marcelus Pais. "Componentes calcináveis para implantes Cone Morse: análise da desadaptação entre pilar / implante." Universidade Federal de Juiz de Fora, 2015. https://repositorio.ufjf.br/jspui/handle/ufjf/124.
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Os sistemas de implantes osseointegráveis se apresentam em um ou mais componentes, e a correta inter-relação, passividade de assentamento e resistência biomecânica, definem a resistência / vulnerabilidade do mesmo frente aos fatores bacterianos e oclusais. Objetivo: Avaliar as deformações inerentes ao processamento laboratorial dos pilares calcináveis de corpo único para o sistema de implantes Cone Morse. Materiais e métodos: Utilizou-se 20 implantes Cone Morse da marca SIN, 10 componentes protéticos calcináveis e 10 não calcináveis. Após os processos laboratoriais, os conjuntos foram submetidos à Microscopia eletrônica de varredura (MEV) da interface pilar/implante, para análise qualitativa e quantitativa da desadaptação gerada. Os conjuntos foram levados a ciclos térmicos (1.000 ciclos) e de fadiga mecânica (500.000 ciclos) e novamente foi realizada a MEV. Os resultados foram comparados através de análise estatística de Mean-Whitmann. Resultados: O grupo de teste (G1) apresentou os maiores valores iniciais, com média de 34, 55 μm e 11,17 μm, para a subdivisões A (fundição) e B (aplicação de porcelana) respectivamente. A subdivisão B do grupo teste apresentou a maior alteração pós testes, com média de 19,28 μm de aumento da desadaptação protética. As subdivisões G1.A, G2.A, G2.B mostraram tendência à diminuição da desadaptação de -1,03 μm, - 1,64 μm, e -0,49 μm, respectivamente. Pilares Cone Morse não calcináveis apresentam-se com alta estabilidade e baixa taxa de desadaptações. Para o grupo teste pode-se afirmar que o processo de fundição nitidamente criou as maiores dilatações e desadaptações das estruturas. O processo de sinterização da porcelana em teste, criou uma redução da desadaptação medida, porém esta voltou a aumentar após os testes em laboratório. Para o grupo controle, houve a manutenção das taxas de desadaptações menores ao limite de 10 μm, e com tendência de redução após os testes. Conclusão: O pilar calcinável Cone Morse de corpo único mostrou-se como desfavorável quanto à biomecânica, e o processo de fundição gerou as maiores desadaptações.
The system of dental implants present in one or more components, and the correct interrelationship, settling and passive biomechanical strength, defining the strength / vulnerability of the same to the forward occlusal and bacterial factors.Objective: To evaluate the defects associated to laboratory processing of abutments of unique body to the system of Cone Morse implants. Methods: We used 20 Cone Morse implants SIN brand, prosthetic components 10 and 10 calcinable not calcinable. After the laboratory processes the sets were subjected to scanning electron microscopy (SEM) of the pillar / implant interface, for qualitative and quantitative analysis of the generated misfit. The samples were taken to alternated thermal cycles (1000 – 50 and 550) and mechanical fatigue (500,000 - 120 N/cm2) and again was carried out by SEM. The results were compared by statistical analysis Mean-Whitmann (P>0,05). Results: The test group (G1) showed the highest initial values, averaging 34.55 and 11.17 micrometres for subdivisions A (casting) and B (porcelain application) respectively. The B subdivision of the test group showed the greatest change after tests, averaging 19.28 mm of increasing prosthetic misfit. The G1.A subdivisions, G2.A, G2.B showed a tendency to decrease the mismatch of -1.03 micrometres - 1.64 micrometres and -0.49 micrometres respectively. Pillars Cone Morse calcinable not present with high stability and low rate misfits. For the test group it can be said that the casting process clearly created the largest expansion and mismatches of structures. The porcelain sintering process under test, created a reduction of the mismatch measure, however this increased again after the tests in the laboratory. For the control group, there was the maintenance of rates of minor mismatches to 10 micrometres limit, and with downward trend after the tests. Conclusion: Cone Morse castable pillars proved to be unfavorable on the biomechanics, and the casting process generated the biggest misfits.
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Lima, Rodrigo Trentin Alves de. "Avaliação do desajuste vertical e da espessura de película de infra-estruturas de três sistemas cerâmicos." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/25/25135/tde-04092007-145016/.
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O desenvolvimento de novos sistemas cerâmicos propicia a possibilidade de escolha do tipo de restauração que se deseje utilizar. Entretanto, os benefícios advindos deste progresso devem ser avaliados frente à possibilidade de comportamento clínico insatisfatório. Este trabalho se propõe a avaliar infra-estruturas cerâmicas quanto à influência do ajuste interno na adaptação, o desajuste vertical após a simulação da cimentação, a espessura de película nas superfícies axiais e oclusal e a ocorrência de assentamento oblíquo. Um troquel-padrão metálico com preparo para coroa total em pré-molar superior foi confeccionado e trinta troquéis de gesso foram obtidos e dividos em três grupos de dez espécimes cada. Sobre os troquéis de gesso foram confeccionadas infra-estruturas metálicas para o grupo MC, infra-estruturas cerâmicas In-Ceram Zirconia, para o grupo IZ, e Procera AllZircon, para o grupo PZ. As infra-estruturas tiveram sua posição, em relação ao troquel-padrão, mensurada durante ajuste interno e simulação da cimentação com silicone de consistência fluida (cimento-análogo). A película de cimento-análogo abaixo das infra-estruturas foi seccionada no sentido vestíbulo-lingual e mensurada nas paredes axiais e oclusal. A análise dos resultados demonstrou que: 1) o ajuste interno das infra-estruturas metalo-cerâmicas e In-Ceram Zirconia resultou em redução do desajuste vertical; 2) o desajuste vertical das infra-estruturas Procera AllZircon foi estatisticamente diferente das infra-estruturas metalo-cerâmicas e In-Ceram Zirconia; 3) a espessura de película das infra-estruturas Procera AllZircon foi significantemente maior que das infra-estruturas metalo-cerâmicas e In-Ceram Zirconia; 4) todas as infra-estruturas apresentaram assentamento oblíquo.The development of new ceramic systems creates the possibility of choice above the type of restoration one could mean to choose. Thus, benefits from this progress must be appraised on the possibility of unsatisfactory clinical behavior. This work intends to evaluate ceramic copings to the influence of internal adjustment on adaptation, vertical misfit after cementation, film thickness of axial and occlusal surfaces and occurrence of oblique seating. A metallic superior premolar analogue with full crown preparation was yield and thirty casts were obtained and divided into three groups of ten specimens each. Metal copings were yield for group MC and ceramics copings of In-Ceram Zirconia and Procera AllZircon were yield for group IZ and group PZ, respectively. The copings had their position, in relation to the metallic analogue, measured during adjustment and cementation with light body silicon. Cement film, below the copings, was sectioned and measured at the axial and occlusal surfaces. The analysis of the results demonstrated that: 1) internal adjustment of metal and In-Ceram Zirconia copings reduced the vertical misfit; 2) vertical misfit after cementation of Procera AllZircon copings was statistically different from metal and In-Ceram Zirconia copings; 3) film thickness of Procera AllZircon copings was significantly greater than metal and In-Ceram Zirconia copings; 4) all copings presented oblique seating.
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Kalläne, Matthias [Verfasser], Lutz [Akademischer Betreuer] Kipp, and Michael [Gutachter] Bauer. "Towards angle and space resolved photoemission : bonding in layered misfit compounds and development of reflective photon sieves / Matthias Kalläne ; Gutachter: Michael Bauer ; Betreuer: Lutz Kipp." Kiel : Universitätsbibliothek Kiel, 2021. http://d-nb.info/122588070X/34.
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