Tesis sobre el tema "Interface physics"
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Hansson, Henrik. "Craft Physics Interface". Thesis, Linköping University, Department of Computer and Information Science, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8497.
Texto completoThis is a masters thesis (20p) in computer science at the University of Linköping. This thesis will give an introduction to what a physics engine is and what it consist of. It will put some engines under the magnifying glass and test them in a couple of runtime tests. Two cutting edge commercial physics engines have been examined, trying to predict the future of physics engines. From the research and test results, an interface for physics engine independency has been implemented for a company called Craft Animations in Gothenburg, Sweden.
Chen, Chun-Chung. "Understanding avalanche systems through underlying interface dynamics /". Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/9755.
Texto completoBerman, Lorne David. "Xmess--a graphical voice-mail interface". Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/77882.
Texto completoWang, Chenggong. "Interface Studies of Organic/Transition Metal Oxide with Organic Semiconductors and the Interfaces in the Perovskite Solar Cell". Thesis, University of Rochester, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3723336.
Texto completoIn recent decades, research and development of organic based semiconductor devices have attracted intensive interests. One of the most essential elements is to understand the electronic structures at various interfaces involved in these devices since the interface properties control many of the critical electronic processes. It is thus necessary to study the electronic properties of the organic semiconductors with surface analytical tools to improve the understanding of the fundamental mechanisms involved in the interface formation. This thesis covers the experimental investigations on some of the most interesting topics raised in the recent development of organic electronic devices. The thesis intends to reveal the physical processes at the interface and their contribution to the device performance with photoemission and inverse photoemission investigations on the evolution of the occupied and unoccupied electronic structures. I will report a substantial difference in the electron affinity of CuPc on two substrates as the orientations of CuPc are different. I will also illustrate that the CuPc has standing up configuration on one monolayer of C60 on SiO2 while lying down on one monolayer of C60 on HOPG. Meanwhile, the CuPc on more than one monolayers of C60 on different substrates show that the substrate orientation effect vanished. Then I will propose a two-stage model to describe the bulk doping effect of C60 by molybdenum oxide. I will also demonstrate that the doping effect of C60 by ultra-thin layer molybdenum oxide is weaker than that by interface doping and bulk doping. I will demonstrate that for Au on CH3NH3PbI3, hole accumulation occurs at the vicinity of the interface, facilitating hole transfer from CH3NH3PbI3 to Au. I will show a strong initial shift of core levels to lower binding energy in C60 on CH3NH3PbI3 interface, which indicates that electrons transfer from the perovskite film to C60 molecules. I will further demonstrate that the molybdenum oxide surface can be passivated by approximately two monolayers of organic thin films against exposure to air. I will discuss the mechanism that how oxygen plasma treatment effectively recover the high work function drop of molybdenum oxide by air exposure. At the end, I will show that a small energy offset at Pentacen/C60 heterojunction makes it easy to transfer electrons from Pentacene to C60 even under a small applied bias, facilitating the occurrence of charge generation. Finally, I will summarize the thesis.
Mafi, Mariyeh. "Magnetic Characteristics of the Manganese-/Iron-Phthalocyanine Interface". Thesis, California State University, Long Beach, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10639509.
Texto completoThe magnetic properties of Metallo-organic heterostructure interfaces are studied. These heterostructures are built with manganese phthalocyanine (MnPc) and iron phthalocyanine (FePc). Previously, the powder of each material is reported to be an Ising-like chain magnet with Arrhenius relaxation. The relaxation is slow enough to exhibit magnetic hysteresis at low temperatures. Each layer of the heterostructure is investigated separately by depositing a thin film of either iron phthalocyanine (FePc) or manganese phthalocyanine (MnPc) on a Silicon substrate heated to 150 °C. FePc thin films show magnetic hysteresis below 5K with a typical coercivity of 1850 ± 50 Oe and moment of about 1.9 µB in agreement with values from the literature. Similarly, the MnPc thin film deposited at 150 °C shows magnetic hysteresis at 2.5 K, and no hysteresis at 5K and 10 K. A coercive field of 390 Oe is recorded at 2.5 K. The saturation magnetization is near 9 emu cm–3, which corresponds to an effective magnetic moment per Mn ion of about 0.5 µB. For the MnPc/FePc thin film bilayer, the FePc is deposited at 150 °C onto the Silicon substrate, the sample is cooled to room temperature followed by the MnPc deposition in situ. The magnetic moment of this heterostructure is consistent with contributions from the FePc layer only, since the room temperature deposited MnPc has antiferromagnetic characteristics. This heterostructure has magnetic hysteresis with a coercivity of 910 Oe. No measurable shift of the hysteresis loops—as expected for an antiferromagnetic-ferromagnetic coupled interface—is observed in this set of bilayers.
Zhu, Kai Schiff Eric A. "Interface modulation spectroscopy and doping physics in amorphous silicon". Related Electronic Resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2003. http://wwwlib.umi.com/cr/syr/main.
Texto completoVisell, Yon. "Walking on virtual ground: physics, perception, and interface design". Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=103551.
Texto completoLes capacités sensori-motrices du pied sont essentielles à la locomotion humaine, à la collecte d'informations sur les surfaces de marche, et à l'interaction avec des objets au sol. La locomotion est de plus en plus utilisée pour interagir et naviguer dans les environnements virtuels immersifs, mais, contrairement à la main, peu d'attention a été accordée au rendu des sensations haptiques pour les pieds. Cette thèse aborde plusieurs problèmes liés à la réalisation d'expériences haptiques de marche sur des terrains virtuels. Tout d'abord, une nouvelle famille d'interfaces est présentée, fondée sur un dispositif vibrotactile intégré dans un carreau rigide. Sa dynamique structurelle et son contrôleur ont été optimisés pour assurer sa capacité à reproduire fidèlement les vibrations mécaniques dans une large bande de fréquence, ce qui était nécessaire à la réalisation de l'étude de perception présentée en deuxième partie de la thèse. Un pavage de ces dispositifs est utilisé pour simuler des terrains virtuels et des planchers tactiles multi-points, dont l'ergonomie est démontrée de manière empirique. Le deuxième volet de cette thèse est une étude expérimentale sur la contribution de l'information vibrotactile à la perception de la compliance du sol. Une nouvelle illusion perceptuelle haptique est démontrée, dans laquelle la compliance apparente du sol est augmentée par les vibrations ressenties par la plante du pied. Cette étude a également révélé l'étonnante capacité de l'interface vibrotactile à surmonter, en partie, une limitation intrinsèque : son incapacité à transmettre des informations kinesthésiques force-déplacement. La troisième partie de la thèse analyse les signaux mécaniques complexes produits par les processus physiques inélastiques dans les matériaux désordonnés tels que ceux rencontrés lors de la marche en terrain naturel. Les modèles de fluctuations accompagnant le frottement de glissement et les processus de fracture dans les matériaux hétérogènes quasi-fragiles soumis aux charges variables sont caractérisés par des méthodes de physique statistique. Cette analyse est utilisée pour formuler de nouveaux algorithmes pour la synthèse haptique des signatures à hautes fréquences des processus de fracture dans les composites de fibres et les materiaux granulaires compressés. En conclusion, cette thèse présente un dispositif vibrotactile et des techniques novateurs pour interagir avec des terrains virtuels. Elle démontre un nouvel effet perceptuel qui justifie le paradigme d'interaction haptique adopté ici. Enfin, elle analyse et modélise certains phénomènes physiques associés à la marche sur des terrains naturels complexes.
Park, Sungkyun. "Interface effects in ultra-thin films: Magnetic and chemical properties". Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/279832.
Texto completoThompson, Jeffrey Douglas. "A quantum interface between single atoms and nanophotonic structures". Thesis, Harvard University, 2014. http://nrs.harvard.edu/urn-3:HUL.InstRepos:13070060.
Texto completoPhysics
Srivastava, Nishtha. "Interface Structure of Graphene on SiC for Various Preparation Conditions". Research Showcase @ CMU, 2012. http://repository.cmu.edu/dissertations/90.
Texto completoVideen, Gorden Wayne. "Light scattering from a sphere on or near an interface". Diss., The University of Arizona, 1992. http://hdl.handle.net/10150/185775.
Texto completoDickinson, William Winsor. "Interfacial Forces of 2D Materials at the Oil–Water Interface". W&M ScholarWorks, 2019. https://scholarworks.wm.edu/etd/1563898998.
Texto completoDoust, T. "Surface processes at the Ag/Si interface". Thesis, University of Sussex, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306599.
Texto completoWang, Chuandao Charlie y 王传道. "Organic solar cells towards high efficiency: plasmonic effects and interface engineering". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B48329654.
Texto completopublished_or_final_version
Electrical and Electronic Engineering
Doctoral
Doctor of Philosophy
Govind, Niranjan. "Theoretical study of models for driven interface dynamics". Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=56667.
Texto completoArechabaleta, Rafael. "AFM and SPR studies of protein adsorption at solid/liquid interface". FIU Digital Commons, 1999. http://digitalcommons.fiu.edu/etd/1054.
Texto completoOsman, S. M. "Theoretical studies of the fluid-fluid interface". Thesis, University of East Anglia, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382833.
Texto completoSukirno. "Ion beam induced interface motion and impurity relocation". Thesis, University of Salford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293846.
Texto completoPalmgren, Pål. "Initial stages of metal- and organic-semiconductor interface formation". Licentiate thesis, KTH, KTH, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3911.
Texto completoThis licentiate thesis deals with the electronic and geometrical properties of metal-semiconductor and organic-semiconductor interfaces investigated by photoelectron spectroscopy and scanning tunneling microscopy.
First in line is the Co-InAs interface (metal-semiconductor) where it is found that Co is reactive and upon adsorption and thermal treatment it alloys with the indium of the substrate to form metallic islands, about 20 nm in diameter. The resulting broken bonds causes As entities to form which are loosely bond to the surface and evaporate upon thermal treatment. Thus, the adsorption of Co results in a rough interface.
Secondly the metal-free phthalocyanine (H2PC) - titanium dioxide interface (organic-semiconductor) is investigated. Here it is found that the organic molecules arrange themselves along the substrate rows upon thermal treatment. The interaction with the TiO2 is mainly with the valence Π-electrons in the molecule causing a relatively strong bond, but this interaction is short range as the second layer of molecules retains their molecular character. This results in an ordered adsorption but limited mobility of the molecules on the surface prohibiting well ordered close packed layers. Furthermore, the hydrogen atoms inside the cyclic molecule leave the central void upon thermal treatment.
The third case is the H2PC-InAs/InSb interface (organic-semiconductor). Here ordered overlayer growth is found on both substrates where the molecules are preferentially adsorbed on the In rows in the [110] direction forming one-dimensional chains. The InSb-H2PC interface is found to be weakly interacting and the bulk-like molecular character is retained upon both adsorption and thermal treatment. On the InAs-H2PC interface, however, the interaction is stronger. The molecules are more affected by the surface bond and this effect stretches up a few monolayers in the film after annealing.
Sun, Tao 1957. "Dynamics of a driven interface with a conservation law". Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=39770.
Texto completoBureau, Lionel. "Elasticité et rhéologie d'une interface macroscopique : du piégeage au frottement solide". Phd thesis, Université Paris-Diderot - Paris VII, 2002. http://tel.archives-ouvertes.fr/tel-00001413.
Texto completoHaschke, Heiko. "Force spectroscopy and microscopy of single molecules at the solid-liquid interface". Thesis, University of Bristol, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288334.
Texto completoBeck, Kristin M. (Kristin Marie). "A photon-photon interface with an atomic ensemble in an optical cavity". Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/104501.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (pages 133-140).
Since the emergence of quantum computing as a field, interactions between two-level systems that can carry quantum information have been conceptualized in terms of quantum devices. Here, I demonstrate four such devices for optical photons traveling in two different modes: an all-optical switch and transistor, a nondestructive photon detector, a phase shifter, and a quantum state generator. These devices rely on a nonlinear optical interface comprised of a few thousand atoms inside of a high-finesse optical cavity. Signal light is sent through a mode transverse to the cavity and is stored or travels through the atoms as a collective excitation. The corresponding atomic population couples to the cavity mode's optical field. The strength of the resulting photon-photon interaction is governed by the optical depth of the atoms for the signal light, and the strong atom-photon coupling in the optical cavity. I first demonstrate an all-optical switch and transistor using blocking interactions that reduce the cavity's transmission by a factor of 11 +/- 1 in the presence of a stored signal photon. This interaction creates anticorrelations between the output light in the signal and cavity paths. I show that these anticorrelations persist in time continuous operation when the photon signal and cavity arrive at the same time. Then, I turn to photon detection. I reconfigure the system and reconceptualize it as a nondestructive, cavity-based detector for signal light. I demonstrate strong correlations between this nondestructive detection and a subsequent destructive detection with non-destructive detection efficiency of 0.5%. Next, I show that a single cavity photon can shift the phase of stored signal light by up to 1.0 +/- 0.4 rad and demonstrate entanglement between output cavity and signal photons. Finally, I present recent experiments where this entanglement is used to modify the phase and amplitude of the signal light by making a projective measurement on the cavity light.
by Kristin M. Beck.
Ph. D.
Diez, Pinzon Sandra. "Magnetic properties and interface scattering contribution to the anomalous Hall effect in cobalt / palladium multilayers". Thesis, California State University, Long Beach, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10007420.
Texto completo[Co/Pd]n multilayers with different number of repetitions n were deposited on Si substrates in order to study the magnetic properties and Hall resistivity in this system. The magnetic moment dependence on applied field was studied in parallel (in-plane) and perpendicular (out-of-plane) configurations. The [Co/Pd]n multilayers with 2 and 3 repetitions, with thickness of the Co sublayer of 0.8 and 1.0 nm and thickness of the Pd sublayer of 1.3 and 2.0 nm, were found to have perpendicular magnetic anisotropy. The Hall resistivity dependence on applied field was measured at different temperatures. The Hall hysteresis loops confirm the perpendicular anisotropy of the multilayers, and indicate that the origin of the anomalous Hall effect (AHE) in this system, with low number of repetitions, is dominated by surface scattering.
Streib, Amanda Pascoe. "Markov chains at the interface of combinatorics, computing, and statistical physics". Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43628.
Texto completoSheppard, Daniel Crispin. "Surface and interface structural studies using medium energy ion scattering". Thesis, University of Warwick, 2010. http://wrap.warwick.ac.uk/34612/.
Texto completoSzabo, Tamas. "Energy transfer at gas-liquid interface towards energetic materials /". Diss., Columbia, Mo. : University of Missouri-Columbia, 2007. http://hdl.handle.net/10355/4797.
Texto completoThe entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on February 29, 2008) Vita. Includes bibliographical references.
Lanre, Akinyemi B. "The Interface Dynamics in the Hele-Shaw Cell". Ohio University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1520530015535937.
Texto completoArab, Arian. "Probing the Surface- and Interface-Sensitive Momentum-Resolved Electronic Structure of Advanced Quantum Materials and Interfaces". Diss., Temple University Libraries, 2019. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/547230.
Texto completoPh.D.
In this dissertation, we used a combination of synchrotron-based x-ray spectroscopic techniques such as angle-resolved photoelectron spectroscopy (ARPES), soft x-ray ARPES, hard x-ray photoelectron spectroscopy (HAXPES), and soft x-ray absorption spectroscopy (XAS) to investigate momentum-resolved and angle-integrated electronic structure of advanced three- and two-dimensional materials and interfaces. The results from the experiments were compared to several types of state-of-the-art first-principles theoretical calculations. In the first part of this dissertation we investigated the effects of spin excitons on the surface states of samarium hexaboride (SmB6), which has gained a lot of interest since it was proposed to be a candidate topological Kondo insulator. Here, we utilized high-resolution (overall resolution of approximately 3 meV) angle-resolved and angle-integrated valence-band photoemission measurements at cryogenic temperatures (1.2 K and 20 K) to show evidence for a V-shap
Temple University--Theses
Kabakıoğlu, Alkan 1968. "Scaling studies of frustrated systems, random-field tricriticality, electronic conduction models, and interface delocalization". Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/85329.
Texto completoMcLaughlin, Arthur Charles. "Surface properties of surfactant solutions". Thesis, Queen's University Belfast, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334508.
Texto completoLabuda, Aleksander. "Adventures in atomic force microscopy towards the study of the solid-liquid interface". Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=110355.
Texto completoCette thèse présente la conception et le développement d'un microscope électrochimique à force atomique (AFM) équipé d'excitation photothermique pour l'actionnement du levier pour l'étude de l'interface solide-liquide. Une analyse rigoureuse de bruit dans la méthode de déviation du faisceau optique est présentée et conduit à des nouvelles techniques pour la réduction du bruit de détection à des niveaux en dessous du bruit thermique du levier. Une simulation stochastique d'AFM démontre que le bruit thermique limite fondamentalement la mesure des structures d'hydratation à l'interface mica/eau, tandis que les vibrations méchaniques peuvent dominer la mesure des deux dernières couches d'hydratation au dessus de la surface. Des problèmes couramment négligés associés à l'excitation piezoacoustique traditionnellement utilisée sont décrits et quantifiés par rapport à la modulation de fréquence (FM) et à la modulation d'amplitude (AM) des méthodes de l'AFM en mode dynamique. Après une description de la mécanique statistique de la double couche électrique (EDL) de solutions aqueuses, des measures de spectroscopie de force de l'interface mica-eau acquises en mode FM-AFM en trois dimensions sont présentées à côté d'une analyse détaillée des profils d'amortissement et de la force utilisée pour la détermination d'une distance absolue entre la pointe et l'échantillon par comparaison à des simulations. Enfin, la mécanique statistique de l'électrochimie ionique moderne est vulgarisée, suivie d'une enquête approfondie de la voltampérométrie cyclique du 1-butyl-3-méthylimidazolium hexafluorophosphate près de l'interface du Au(111) avec comparaison avec les résultats publiés de spectroscopie d'impédance électrochimique. Les observations électrochimiques sont complétées par des mesures de spectroscopie de force réalisée à l'aide d'AM-AFM à différents potentiels électrochimiques d'électrodes à travers une fenêtre de 2 V - aucune relation entre la structure et le potentiel EDL n'a été observée.
Williams, Anthony F. "The behaviour of semi-stable filters under hydraulic loading normal to the interface". Thesis, Kingston University, 1992. http://eprints.kingston.ac.uk/20567/.
Texto completoNute, Jonathan. "A quantum integrated light and matter interface". Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/41595/.
Texto completoYamashita, Naoto. "Study on the Physics of Metal/Si Interfaces in Si-based Spin Devices". Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/265203.
Texto completo京都大学
新制・課程博士
博士(工学)
甲第23431号
工博第4886号
新制||工||1764(附属図書館)
京都大学大学院工学研究科電子工学専攻
(主査)教授 白石 誠司, 教授 木本 恒暢, 教授 引原 隆士
学位規則第4条第1項該当
Doctor of Philosophy (Engineering)
Kyoto University
DGAM
Mellema, Garfield Richard. "Subcritical acoustic scattering across a rough fluid-solid interface /". Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/6098.
Texto completoCarbajal-Gomez, Leopoldo. "Transport in turbulent plasmas at the interface between different levels of description". Thesis, University of Warwick, 2015. http://wrap.warwick.ac.uk/73926/.
Texto completoAlwusaydi, Huda Abdulaziz. "LINE TENSION ASSOCIATED WITH THE MONOLAYER/TRILAYER BOUNDARY OF 8CB AT THE AIR-WATER INTERFACE". Kent State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=kent1496412951160797.
Texto completo李加碧 y Stella Li. "Interface state generation induced by Fowler-Nordheim tunneling in mosdevices". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31221403.
Texto completoMahoney, Alice Charlotte. "Integrated Readout at the Quantum-Classical Interface of Semiconductor Qubits". Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/17366.
Texto completoChappell, Isaac Samuel 1972. "Calculation of interface tension and stiffness in a two dimensional Ising Model by Monte Carlo simulation". Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/49672.
Texto completoIncludes bibliographical references (p. 55).
The two dimensional Ising Model is important because it describes various condensed matter systems. At low temperatures, spontaneous symmetry breaking occurs such that two coexisting phases are separated by interfaces. These interfaces can be described as vibrating strings and are characterized by their tension and stiffness. Then the partition function can be calculated as a function of the magnetization with the interface tension and stiffness as parameters. Simulating the two dimensional Ising Model on square lattices of various sizes, the partition function is determined in order to extract the interface tension. The configurations being studied have low probability of actual occurrence and would require a large number of Monte Carlo steps before obtaining a good sampling. By using improved estimators and a trial distribution, fewer steps are needed. Improved estimators decrease the number of steps to achieve a certain level of accuracy. The trial distribution allows increased statistics once the general shape of the probability distribution is calculated from a Monte Carlo simulation. For small lattice sizes, it is easy to run Monte Carlo simulations to generate the trial distribution. At larger lattice sizes, it is necessary to build the trial distribution from a combination of a Monte Carlo simulation and an Ansatz from theory due to lower statistics. The extracted values of the interface tension agree with the analytical solution by Onsager.
by Isaac Samuel Chappell, II.
S.M.
Bowfield, Andrew. "Spectroscopic considerations on molecular adsorption at the solid/liquid interface". Thesis, University of Liverpool, 2009. http://livrepository.liverpool.ac.uk/1225/.
Texto completoLi, Stella. "Interface state generation induced by Fowler-Nordheim tunneling in mos devices /". Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B20566487.
Texto completoEickmann, James Thomas 1970. "Influence of ultra-thin Au interface layers on the structure and magnetic anisotropy of Co films". Diss., The University of Arizona, 1998. http://hdl.handle.net/10150/282634.
Texto completoVan, Zyl Hendrik Jacobus Rust. "Bound states near the interface of a distorted graphene sheet and a superconductor". Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/18039.
Texto completoENGLISH ABSTRACT: The goal of this thesis is to investigate the effects of distorting a graphene lattice and connect- ing this distorted graphene sheet to a superconductor. At low energies the possible excitation states in graphene are restricted to two distinct regions in momentum space called valleys. Many electronic applications are possible if one can design a graphene system where excitations can be forced to occupy a single valley in a controllable way. Investigating the spectrum of the distorted graphene sheet reveals that, if the chemical potential is chosen to coincide with a bulk Landau level, the normal-superconductor interface always supports propagating modes in both directions. Excitations from opposite valleys travel in opposite directions along the interface. The spectrum of a distorted graphene sheet terminated by an armchair edge, in contrast, is dis- persionless. We verify this insulating nature of the armchair edge for finite samples by numerical means. Furthermore, we verify previous analytical results pertaining to a graphene sheet with NS interface and an applied perpendicular real magnetic field numerically. In the process, it is shown that considering graphene sheets of perfect width is not necessary, as long as the width a few magnetic lengths away from the interface is well-defined. By then considering a finite graphene sheet, terminated by armchair edges, that is distorted and connected to a superconductor, we find bound states near the NS interface that can be changed by distorting the graphene lattice further.
AFRIKAANSE OPSOMMING: Die doel van hierdie tesis is om die uitwerking van die vervorming van ’n grafeenrooster te ondersoek wanneer die met ’n supergeleier verbind word. By lae energieë word die moontlike opwekkings in grafeen beperk tot twee aparte gebiede van momentumruimte — die sogenaamde valleie. Verskeie elektroniese toepassings is moontlik indien ’n grafeenstelsel ontwerp kan word waar opwekkings slegs ’n enkele vallei beset en die besetting beheer kan word. Deur die spektrum van die vervormde grafeenrooster te ondersoek word daar gevind dat, indien die chemiese potensiaal gekies word om saam te val met ’n Landauvlak, die NS-tussenvlak geleiding in beide rigtings ondersteun. Opwekkings van verskillende valleie beweeg in teenoorgestelde rigtings langs die tussenvlak. Daarteenoor is die spektrum van ’n vervormde grafeenroster met ’n leunstoelrand dispersieloos. Ons bevestig hierdie insulerende gedrag van ’n leunstoelrand vir eindige grafeen- roosters deur middel van ’n numeriese berekening. Verder word vorige analitiese resultate wat verband hou met ’n grafeenrooster met normaal-supergeleiertussenvlakstelsel en loodregte mag- neetveld op die vlak bevestig deur middel van numeriese berekeninge. In die proses word dit ook aangedui dat die grafeenrooster nie ’n perfekte wydte hoef te hˆe nie, solank die wydte goed gedefinieer is vir ’n paar magnetiese lengtes in die omgewing van die tussenvlak. Deur dan die eindige grafeenrooster met leunstoelrande te koppel aan ’n supergeleier word gebonde toe- stande naby aan die NS tussenvalk gevind. Hierdie toestande kan gemanipuleer word deur die grafeenrooster verder te vervorm.
Metcalf, Frances L. "The noble metal/elemental semiconductor interface (a study of Ag on Ge(111))". Thesis, University of Sussex, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306595.
Texto completoHaydock, Sarah Amanda. "In situ vibrational spectroscopy of thin organic films confined at the solid-solid interface". Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270369.
Texto completoRousseaux, Germain. "Etude de l'instabilité d'une interface fluide-granulaire : Application à la morphodynamique des rides de plage". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2003. http://tel.archives-ouvertes.fr/tel-00006563.
Texto completoMandal, Pritam. "Phases, line tension and pattern formation in molecularly thin films at the air-water interface". Thesis, Kent State University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3618868.
Texto completoA Langmuir film, which is a molecularly thin insoluble film on a liquid substrate, is one practical realization of a quasi-two dimensional matter. The major advantages of this system for the study of phase separation and phase co-existence are (a) it allows accurate control of the components and molecular area of the film and (b) it can be studied by various methods that require very flat films.
Phase separation in molecularly thin films plays an important role in a range of systems from biomembranes to biosensors. For example, phase-separated lipid nano-domains in biomembranes are thought to play crucial roles in membrane function. I use Brewster Angel Microscopy (BAM) coupled with Fluorescence Microscopy (FM) and static Light Scattering Microscopy (LSM) to image phases and patterns within Langmuir films. The three microscopic techniques — BAM, FM and LSM — are complimentary to each other, providing distinct sets of information. They allow direct comparison with literature results in lipid systems.
I have quantitatively validated the use of detailed hydrodynamic simulations to determine line tension in monolayers. Line tension decreases as temperature rises. This decrease gives us information on the entropy associated with the line, and thus about line structure. I carefully consider the thermodynamics of line energy and entropy to make this connection. In the longer run, LSM will be exploited to give us further information about line structure. I have also extended the technique by testing it on domains within the curved surface of a bilayer vesicle. I also note that in the same way that the presence of surface-active agents, known as surfactants, affects surface energy, the addiction of line active agents alters the inter-phase line energy. Thus my results set to stage to systematically study the influence of line active agents —'linactants' — on the inter-phase line energy.
Hierarchal self-assembled chiral patterns were observed as a function of temperature. I found that the appearance of these domains could be explained with a simple uniaxial optical axis in the underlying structure, which is the first critical step to understanding the origin of these patterns.
Adeyemi, A. O. "Studies of interface dosimetry for photon energies below 1.25 MeV by thermally stimulated exoelectron emission". Thesis, University of Aberdeen, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333919.
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