Dissertations / Theses on the topic 'Concept of surface'
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Cox, Patrick, Christie Jordan, Kate Mangum, John Mitchell, Kevin O'Neill, and Kevin Seraile. "Unmanned surface combatant considerations for concept exploration." Thesis, Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/6962.
Full textThis capstone project explored the operational and design considerations/constraints for an autonomous Unmanned Surface Combatant (USC). Using a USC in selected missions could lead to cost reductions and enhanced capabilities when compared with similar manned combatants by eliminating personnel and automating ship operations. Operations and Support (O&S) costs, which include personnel costs, are a large portion of the Navy's total ownership costs (TOC) for surface combatants, and can be as high as 38 percent of the TOC. Enhanced capabilities for a USC could be derived from performing operational activities manned ships cannot
and automated tasks could be performed more efficiently and effectively by a computer system than a human. A modified waterfall systems engineering process model was used to explore a USC concept. A needs analysis was performed, and mine warfare and anti-submarine warfare were identified as appropriate military missions for an initial USC concept. Top level constraints for a USC concept and support missions were developed. Design considerations, relevant technologies, and concept risks were investigated. This capstone project concluded that a lower cost, higher capability autonomous USC is possible based on the current state of relevant technologies. However there are significant technical challenges to overcome before full autonomy is possible. Further, more rigorous design studies are recommended.
Goggins, David A. "Response surface methods applied to submarine concept exploration." Thesis, Springfield, Va. : Available from National Technical Information Service, 2001. http://handle.dtic.mil/100.2/ADA393310.
Full textIncludes bibliographical references (leafs 89). Also Available online.
Goggins, David A. (David Alexis) 1966. "Response surface methods applied to submarine concept exploration." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8268.
Full textIncludes bibliographical references (leaf 89).
It is estimated that 70 to 85 percent of a naval ship's life-cycle cost is determined during the concept exploration phase which places an importance in the methodology used by the designer to select the concept design. But trade-off studies are guided primarily by past experience, rules-of-thumb, and designer preference. This approach is ad hoc, not efficient and may not lead to an optimum concept design. Even worse, once the designer has a "good" concept design, he has no process or methodology to determine whether a better concept design is possible or not. A methodology is required to search the design space for an optimal solution based on the specified preferences from the customer. But the difficultly is the design space, which is non-linear, discontinuous, and bounded by a variety of constraints, goals, and thresholds. Then the design process itself is difficult to optimize because of the coupling among decomposed engineering disciplines and sub-system interactions. These attributes prevent application of mature optimization techniques including Lagrange multipliers, steepest ascent methods, linear programming, non-linear programming, and dynamic programming. To further improve submarine concept exploration, this thesis examines a statistical technique called Response Surface Methods (RSM). The purpose of RSM is to lead to an understanding of the relationship between the input (factors) and output (response) variables, often to further the optimization of the underlying process. The RSM approach allows the designers to find a local optimal and examine how the design factors affect the response in the region around the generated optimal point. RSM can be applied to submarine concept exploration and provide a methodology to: determine the optimal concept design based on customer preference, efficiently perform trade-off studies, determine the feasible design space, and the ability to determine in advance if a specified concept design is feasible and meets all the customer thresholds and constraints.
by David A. Goggins.
S.M.
Schinke, Wolfgang Josef. "A concept for surface reconstruction from digitised data." Thesis, De Montfort University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.685931.
Full textTran, Ich tach. "Vérification de la validité du concept de surface somme par une approche statistique du contact élastique entre deux surfaces rugueuses." Thesis, Châtenay-Malabry, Ecole centrale de Paris, 2015. http://www.theses.fr/2015ECAP0010/document.
Full textSurface properties, particularly micro-geometry, play a key role in all tribological systems. The analysis of the distribution of contact forces in the interface between rough surfaces is essential for the prediction of friction, wear, adhesion, electrical and thermal contact resistance... Many models have been proposed during the last decades to predict the forces between asperities of rough surfaces. Among these models, statistical models are mainly based on the contact between an equivalent rough surface, the sum surface - which combines micro-geometry of the two surfaces in contact and their material - and a smooth plane. However, the validity of this model has not been clearly demonstrated. The aim of our study was to develop a statistical model of the contact between two random isotropic rough surfaces and then compare the results with those obtained by considering the classical sum surface. The differences between the results have led us to propose a new definition for the sum surface
Wood, Nicola Caroline Gwendoline. "Wet on the surface, rethinking the concept of the trailing spouse." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ65062.pdf.
Full textPrice, Shelly L. (Shelly Loustaunau) 1974. "Integrating response surface methods and uncertainty analysis into ship concept exploration." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/91361.
Full textIncludes bibliographical references (p. 60).
by Shelly L. Price.
Nav.E.
S.M.
Franklin, David. "Concept design and market screening of a surface fatigue test rig." Thesis, KTH, Maskinkonstruktion (Inst.), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-185536.
Full textSwerea KIMAB är ett av Europas ledande institut för metalliska material med spetskompetens inom ett flertal områden. KIMAB’s stora fördel är dess öppna interna struktur där alla grupper och projekt kan dela information och kunskap emellan avdelningarna. Efter att KIMAB flyttade till nya lokaler uppmärksammades det att den kontaktutmattningsrigg de använt under flera år började läcka olja och inte längre var optimal för dagens projekt. Eftersom kontaktutmattning kommer att bli ett viktigare inslag i framtiden då nya legeringar kommer att ersätta befintliga i exempelvis kugghjul, så skapades detta examensjobb som en grund för hur en ny rigg skall införskaffas.Detta examensjobb har som mål att beskriva KIMAB’s behov i en testrigg samt att göra en marknadsundersökning efter befintliga riggar. Därefter skall ett förslag designas på hur en testrigg som är anpassas just för KIMAB’s behov skall kunna byggas. Dessa delar skall sedan ligga som grund för hur KIMAB skall gå vidare i införskaffandet av en ny rigg.Examensarbetets grund ligger i en litteraturstudie i kontaktutmattningsskador samt mekanismerna bakom dessa skador och hur de kan påverkas i ett test scenario. Denna kunskap användes för att undersöka marknaden efter lämpliga riggar som kan uppfylla kraven. Därefter skapades ett antal koncept som utvärderades under ett möte på KIMAB. Det koncept som valdes har därefter designats för att vara så användarvänligt och tillförlitligt som möjligt.När konceptet var färdigställt och prisuppgifter hämtats in på merparten av delarna så har en kostnads och tidskalkyl utförts för att låta läsaren avgöra vilket alternativ som passar bäst för KIMAB. Detta val måste baseras på framtida projekt och hur marknaden ser ut för beställning av kontaktutmattningsprover.
Rangmark, Fredrik. "Concept for an autonomous surface vessel operating in an unknown naval environment." Thesis, KTH, Marina system, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-198517.
Full textBucak, Seyda. "The concept of 'driving force' applied to vesicle formation and breakdown in aqueous media." Thesis, University of East Anglia, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323215.
Full textChattot, Raphael, Bacq Oliver Le, Vera Beermann, Stefanie Kühl, Juan Herranz, Sebastian Henning, Laura Kühn, et al. "Surface Distortion as a Unifying Concept and Descriptor in Oxygen Reduction Reaction Electrocatalysis." Nature Publishing Group, 2019. https://tud.qucosa.de/id/qucosa%3A34832.
Full textWieckiewicz, Mieszko, Eric Wolf, Gert Richter, Heike Meissner, and Klaus Boening. "New Concept of Polymethyl Methacrylate (PMMA) and Polyethylene Terephthalate (PET) Surface Coating by Chitosan." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-215855.
Full textWieckiewicz, Mieszko, Eric Wolf, Gert Richter, Heike Meissner, and Klaus Boening. "New Concept of Polymethyl Methacrylate (PMMA) and Polyethylene Terephthalate (PET) Surface Coating by Chitosan." Molecular Diversity Preservation International (MDPI), 2016. https://tud.qucosa.de/id/qucosa%3A30051.
Full textOzdemir, Ali Yucel. "An Inquiry Into The Concept Of." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12615034/index.pdf.
Full textsurface&rdquo
in the works of Peter Eisenman. In doing so, the concept of &ldquo
surface&rdquo
is discussed under three titles: &ldquo
Surface&rdquo
as an element of architectural vocabulary (as a formal element), as an analytical tool (as a grammar), and as a diagrammatic tool. Correspondingly, the thesis is intended to examine how &ldquo
surface&rdquo
is conceptualized and handled through the critical readings of Eisenman&rsquo
s writings, and projects are referred in order to support and visualize the discussions. In this context, Eisenman&rsquo
s dissertation, The Formal Basis of Modern Architecture (1963), reveals the definition of architectural surface in relation to the architectural language that is proposed by him. Through the formal analysis of Giuseppe Terragni&rsquo
s building, Casa Guiliani Frigerio, he utilizes surface as an analytical tool. Considering design processes of his projects, as discussed in the book Diagram Diaries (1999), surface becomes a dominant tool for generating architectural form. As a result, in this thesis, surface is evaluated in various aspects (as a formal, analytical and diagrammatic tool) that are essential for understanding of architectural form. In the case of Eisenman, its significance dominates the way of developing his architecture.
Kinayoglu, Gokhan. "A Reconsideration Of The Concept Of Architectural Space In The Virtual Realm." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608818/index.pdf.
Full textLemesle, Charlotte. "Peintures auto-stratifiantes bio-sourcées : concept et mécanisme." Thesis, Lille 1, 2020. http://www.theses.fr/2020LIL1R012.
Full textThe goal of this PhD thesis is to design bio-based self-stratifying coatings for railway applications. This process provides a multifunctional coating in a single application step, offering an interesting alternative to conventional multi-layer coating process as it meets current environmental and industrial constraints, such as reduction of waste production, electricity consumption and cost. Over the last three years, self-stratifying coatings based on different bio-based epoxy and silicone resins were set up. As a first step, theoretical models were used to predict the layering of the different binary epoxy/silicon systems. However, the first experimental results obtained were not clearly correlated with the predicted ones in term of stratification level. Indeed, self-stratification phenomenon is influenced by many factors which are usually not taken into account in the theoretical models. The influence of these parameters on the stratification process was therefore investigated during this thesis. It led to the conclusion that the nature, the surface energy and the polarity of the resins, the solvent volatility, the curing temperature and the nature of the cross-linking agent have an impact on the degree of stratification. Thereafter, ageing tests were performed on the coatings showing two perfectly distinct stratified layers, to compare their resistance to humidity and UV radiation to those of conventional multi-layer coatings. Finally, a comparative Life Cycle Assessment was carried out to quantify the environmental impact of the self-stratifying process using bio-based resins compared to the multilayer process using oil-based resins
Ushiama, Taketoshi, and Toyohide Watanabe. "A representation method of time-varying characteristics of entity on the basis of core-surface concept." IEEE, 1996. http://hdl.handle.net/2237/6929.
Full textGoss, Patricia. "THE INFLUENCE OF GRAPHIC ORGANIZERS ON STUDENTS' ABILITY TO SUMMARIZE AND COMPREHEND SCIENCE CONTENT REGARDING THE EARTH'S CHANGING SURFACE." Master's thesis, University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3786.
Full textM.Ed.
Department of Teaching and Learning Principles
Education
K-8 Math and Science MEd
Jeandel, Xavier. "Quelques aspects de la pulvérisation des liquides dans un système annulaire : instabilité de surface - encapsulation - concept LPP." Rouen, 2000. http://www.theses.fr/2000ROUES071.
Full textGirard, Julien. "Validation sur le ciel du concept d'étoile laser polychromatique." Lyon 1, 2005. http://tel.archives-ouvertes.fr/docs/00/10/96/00/PDF/these_girard.pdf.
Full textThe atmospheric turbulence affects image quality and causes angular resolution losses at the focus of large ground based optical telescopes. Real time adaptive optics (AO) corrects wave front distortions measured with at least one bright reference source located within a tiny isoplanatic angle from the science object. At visible wavelengths, the probability to find one such natural star is ridiculously small. The laser guide star (LGS) solves the problem but the overall wavefront slope (referred here as tilt) remains undetermined. The Polychromatic Laser Guide Star will allow the use of AO with full sky coverage. Based on the tilt chromaticity, a multicolor reference spot is created in the upper atmosphere and the differential tilt is measured between two wavelengths to retrieve the tilt itself. In the present thesis, I describe ATTILA, an experiment designed to prove the feasibility of the concept in astronomical conditions. Observations carried on at Observatoire de HauteProvence on natural stars allowed us to establish the proportionality law that links the tilt and the differential tilt for the first time. A temporal monitoring of the two signals shows a good correlation. The accuracy obtained on the slope (about one Airy disk ) let us be optimistic for the future full ELP-OA demonstrator with lasers. This work required an in-depth characterization of a detector featuring the novel EMCCD technology as well as the implementation and tests of pendular seismometers dedicated to measure telescope angular vibrations
Goss, Patricia A. "The influence of graphic organizers on students' ability to summarize and comprehend science content regarding the Earth's changing surface." Orlando, Fla. : University of Central Florida, 2009. http://purl.fcla.edu/fcla/etd/CFE0002595.
Full textConsuegra, Zammit David. "Concept de gestion des eaux de surface : aspects méthodologiques et application au bassin versant de la Broye en Suisse /." [S.l.] : [s.n.], 1992. http://library.epfl.ch/theses/?display=detail&nr=1064.
Full textGirard, Julien. "VALIDATION SUR LE CIEL DU CONCEPT D'ETOILE LASER POLYCHROMATIQUE." Phd thesis, Université Claude Bernard - Lyon I, 2005. http://tel.archives-ouvertes.fr/tel-00106328.
Full textArora, Neha. "Contribution to the concept of micro factory : design of a flexible electromagnetic conveyor system." Thesis, Compiègne, 2017. http://www.theses.fr/2017COMP2347.
Full textThe aim of the thesis is to provide a flexible conveyor system for moving micro-objects. The system may need to be integrated into a micro-factory which requires high reconfigurability and low power consumption. These two criteria have been considered in the design of the conveyor system. The conveyor is based on a planar electromagnetic actuator developed in the Laboratoire Roberval of the UTC, and on smart surface composed of 5 x 5 unit cells; each ceii moves th movable part in the two directions of the plane. An analytical model of the actuator has been developed in order to calculate the electromagnetic forces and the displacement of the mobile part. This modei has been used during the design phase of the conveying system. An experimental prototype is then manufactured and tested which has validated the proposed principle of operation. Experimental tests have shown the ability to perform wide area displacement in both directions of the plane. Numerous experimental tests (control in open loop and closed loop performance characterization as straightness of movement, position repeatability, coupled- decoupled analysis...) have been done to qualify the performance of the conveyor system. Experiments for rotations about the axis perpendicular to the olane have also been performed successfully. Work synthesis: - Static modeling under RADIA was developed in order to design the conveyor surface especially for the transitio zone between two neighboring cells. A dynamic modeling under MATLAB allowed to simulate the behavior of single axis motor in open loop and closed loop control. - A conveyor surface prototype, consisting of a multilayer printed circuit board (4 layers) of dimensions 130 mm x 130 mm, was designed under EAGLE software. The influence of the distance between the first two layers was studied using the developed models to ensure uniform displacement in both the directions. - The experimental tests (with LABVIEW interface) of an elementary cell of the intelligent surface with a moving part composed of two orthogonal magnetic motors has been carried out that allowed to validate the operation of the conveying system in both directions of the plane. - Another series of tests with LABVIEW interface were carried out in order to validate experimentally the displacement of the mobile part with the smart surface at the transition zones between the elementary cells. - These experimental tests showed displacements of great extent in the two directions of the plane and of rotation about the axis perpendicular to the plane. - Long displacements and rotations of the moving part were measured using image processing algorithm developed in MATLAB. - At the same time, a high resolution fiber optic displacement sensor was studied that can be integrated into the conveyor surface locally for the precise positioning. A robust signal processing algorithm for high resolution displacement measurement was developed. In this algorithm, - The optimum position of the movable part is determined in order to obtain a continuous switching betwee the two fiber optic probes ; - The usable parts of the signals obtained from two probes were then filtered to measure the displacement using interpolation method ; The algorithm is implemented under MATLAB and validated by the implementation of the experimental signals. The work have been published in an international journal (Computers in Industry (COMIND)) and presented at international congresses (IEEE Sensors, REM Mechatronics, AIM, IWMF) during the years 2011 to 2016
Huguet, Anne. "Un nouveau concept de séparation actinides-lanthanides en milieu sel fondu : mise en oeuvre d'une cathode liquide à surface renouvelée." Phd thesis, Université Joseph Fourier (Grenoble), 2009. http://tel.archives-ouvertes.fr/tel-00539606.
Full textAbroug, Foued. "Effet des défauts d’usinage sur la tenue en fatigue de pièces aéronautiques." Thesis, Paris, ENSAM, 2018. http://www.theses.fr/2018ENAM0016/document.
Full textThe size of a component has been proved in several studies of the literature to affect the fatigue strength and this trend is known to be more pronounced in the High Cycle Fatigue regime. More exactly a drop of the fatigue limit is observed and this evolution is very often explained by the probability to find a critical defect or a weakest zone in the material as the stressed volume rises. The present manuscript is part of a French research project gathering several industrial and academic partners that aims to control the machining quality of aircraft structural components. For one part of the project the challenge is to define a proper defect acceptability criterion for HCF design purpose. It must be able to account for a large range of surface defects and of component sizes and geometries. Even though the primary objective was to better understand the impact of periodic surface micro-geometry patterns (characteristic of the type of machining used) on the fatigue limit, we thought that it was first necessary to check if a size effect can be observed when an increasing number of artificial simplified surface defects are introduced at the surface of smooth specimens. The aeronautical material under investigation is a 7050 Aluminum alloy (Al Zn6CuMgZr). A large fatigue testing campaign under fully reversed plane bending loading is undertaken on specimens with artificial surface hemispherical defects. Defect number varies from 1 to 44 per specimen whereas their size ranges from 60 µm to 800 µm. Testing results allow the characterization of both Kitagawa effect and scale effect on the fatigue response. A probabilistic approach based on the weakest link concept together with a proper fatigue crack initiation criterion is used to account for the stress distribution and the size of the highly stressed volume. Predictions using FE simulations show a good agreement with experimental results and illustrate the importance of taking the scale effect into account while designing components containing different types of surface defects or roughness patterns.Keywords : Surface defect, HCF, Kitagawa-Takahashi diagram, Weakest link concept, AA7050 alloy
Taylor, Amy Rebecca. "Students' and Teachers' Conceptions of Surface Area to Volume in Science Contexts: What Factors Influence the Understanding of the Concept of Scale?" NCSU, 2008. http://www.lib.ncsu.edu/theses/available/etd-03022008-181319/.
Full textJanati, Idrissi Abderrazak. "Caractérisation physico-chimique des alumines par le concept d'objets fractals." Poitiers, 1988. http://www.theses.fr/1988POIT2305.
Full textZaïm-Bilheux, Hassina. "Design and initial comparative evaluation studies of conventional "surface" and new concept "volume"-type, all permanent magnet electron cyclotron resonance (ECR) ion sources." Versailles-St Quentin en Yvelines, 2003. http://www.theses.fr/2003VERS0008.
Full textECR ion sources are clearly the best choice of existing sources for the generation of CW beams of highly charged ions, and therefore, they are at a premium for high-energy accelerator-based applications. The technology of the source has slowly but steadily advanced over the past several years (improvement in plasma confinement; use of very high frequency microwave radiation; improvement in vacuum quality; supplementing their plasma discharges with cold electrons; biased disks; and gas mixing effect). Recently, it has been suggested that their performances can be significantly further enhanced by incresing the physical sizes of their ECR zones in relation to the sizes of their plasma volumes (spatial and frequency domain methods). A 6 GHz, all-permanent magnet ECR ion source with à large resonant plasma volume has been designed, constructed and initially tested at the Oak Ridge National Laboratory. The conventional minimum-B("surface") resonance conditions so that direct comparaisons of the performances of the two source types can be made under identical operating conditions. According to initial test results, the flat-B source performs better than its conventionnal-B conterpart, in terms of charge-state distribution and intensity within a particular charge-state. This is attributable to the very large ECR zones present in the source and their locations with respect to the launch direction of the RF power
Hanekamp, Patrick [Verfasser], and Frank-Michael [Akademischer Betreuer] Matysik. "Development and application of an experimental concept for surface characterization of semiconductor based substrates using scanning electrochemical microscopy / Patrick Hanekamp ; Betreuer: Frank-Michael Matysik." Regensburg : Universitätsbibliothek Regensburg, 2020. http://d-nb.info/1207153222/34.
Full textCole, Robert Pierre. "A reality running like a subterranean river under the surface, the place of the Jungian concept of individuation in the non-Deptford writings of Robertson Davies." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0002/NQ29026.pdf.
Full textSang, Shengbo [Verfasser], Hartmut [Akademischer Betreuer] Witte, Klaus [Akademischer Betreuer] Liefeith, and Theodor [Akademischer Betreuer] Doll. "An approach to the design of surface stress-based PDMS micro-membrane biosensors - concept, numerical simulations and prototypes / Shengbo Sang. Gutachter: Klaus Liefeith ; Theodor Doll. Betreuer: Hartmut Witte." Ilmenau : Universitätsbibliothek Ilmenau, 2010. http://d-nb.info/1010814516/34.
Full textMoreira, Baltar Bellemain Paula. "Enseignement et apprentissage de la notion d'aire de surfaces planes : une étude de l'acquisition des relations entre les longueurs et les aires au collège." Université Joseph Fourier (Grenoble), 1996. http://www.theses.fr/1996GRE10193.
Full textPeltier, Fabienne. "Influence du transport de matière sur la compétition entre la corrosion d'une surface d'un alliage d'aluminium mis à nu et le relâchement de peintures fonctionnalisées par des pigments inhibiteurs : validation d'un concept de capteur de corrosion." Thesis, Dijon, 2014. http://www.theses.fr/2014DIJOS042/document.
Full textThe conventional aircraft paint scheme for corrosion protection of aluminum structures is partly based on application of a primer containing inhibitors. In such coatings, release of the inhibiting species enables fast healing of a bare metal surface after a mechanical damage of the protective layers. Nevertheless, considering possible depletion of inhibitors by uncontrolled leaching, it appears important to estimate the corrosion risk integrating “corrosion” sensors in the structure. The objective of this work was to understand the operating mode of a sensor simulating a damaged paint coating whose concept is based on the competition between the triggering of localized corrosion and the passivation of a bare 2024 alloy. The behavior of this massive alloy and Al-Cu solid solutions (the active metallic slots of the sensor) was studied in chloride solution in presence or not of inhibitor ions at different concentrations.Varying the size of a cut-edge electrode coated on both sides, the effectiveness of these inhibitors was demonstrated detecting the microstructural corrosion triggering or its inhibition, by mapping surface pH. Combining these chemical probing with in situ observations it was possible to confirm the nature of the limiting steps controlling the competition between corrosion and passivation. These analyzes highlighted that to quantify this competition, the triggering of the microstructural corrosion represents a key factor which is not possible to mimic by the response of the solid solutions.The existence of a threshold value for the distance between the inhibitor source and the area to be passivated has been confirmed by simulating the mass transport of inhibiting species which appear to be dependent of the release rate of inhibitors
TAKAGI, Kenji, 光夫 野津, Mitsuo NOZU, 利弘 野田, Toshihiro NODA, 敏浩 高稲, Toshihiro TAKAINE, and 健次 高木. "水~土連成計算を用いた砂杭拡径による砂地盤の締固めメカニズムの一考察." 土木学会, 2001. http://hdl.handle.net/2237/8642.
Full textNamutebi, May. "Some Aspects of Foamed Bitumen Technology." Licentiate thesis, KTH, Väg- och banteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-32944.
Full textQC 20110427
Guest, Simon David. "Deployable structures : concepts and analysis." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336615.
Full textDragaš, Milan. "Advanced concepts in vertical cavity surface emitting lasers." Thesis, University of Bristol, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404105.
Full textHattar, Susan. "Concept de surfaces biomimétiques pour stimuler in vitro l'ostéogenèse." Paris 7, 2004. http://www.theses.fr/2004PA07A001.
Full textTobgay, Sonam. "Novel concepts for RF surface coils with integrated receivers." Link to electronic thesis, 2004. http://www.wpi.edu/Pubs/ETD/Available/etd-0419104-141545.
Full textShah, Raza. "Property inference decision-making and decision switching of undergraduate engineers : implications for ideational diversity & fluency through movements in a Cartesian concept design space." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/278700.
Full textWu, Dongping. "Novel concepts for advanced CMOS : Materials, process and device architecture." Doctoral thesis, KTH, Microelectronics and Information Technology, IMIT, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3805.
Full textThe continuous and aggressive dimensional miniaturization ofthe conventional complementary-metal-oxide semiconductor (CMOS)architecture has been the main impetus for the vast growth ofIC industry over the past decades. As the CMOS downscalingapproaches the fundamental limits, unconventional materials andnovel device architectures are required in order to guaranteethe ultimate scaling in device dimensions and maintain theperformance gain expected from the scaling. This thesisinvestigates both unconventional materials for the gate stackand the channel and a novel notched-gate device architecture,with the emphasis on the challenging issues in processintegration.
High-κ gate dielectrics will become indispensable forCMOS technology beyond the 65-nm technology node in order toachieve a small equivalent oxide thickness (EOT) whilemaintaining a low gate leakage current. HfO2and Al2O3as well as their mixtures are investigated assubstitutes for the traditionally used SiO2in our MOS transistors. These high-κ filmsare deposited by means of atomic layer deposition (ALD) for anexcellent control of film composition, thickness, uniformityand conformality. Surface treatments prior to ALD are found tohave a crucial influence on the growth of the high-κdielectrics and the performance of the resultant transistors.Alternative gate materials such as TiN and poly-SiGe are alsostudied. The challenging issues encountered in processintegration of the TiN or poly-SiGe with the high-k are furtherelaborated. Transistors with TiN or poly-SiGe/high-k gate stackare successfully fabricated and characterized. Furthermore,proof-of-concept strained-SiGe surface-channel pMOSFETs withALD high-κ dielectrics are demonstrated. The pMOSFETs witha strained SiGe channel exhibit a higher hole mobility than theuniversal hole mobility in Si. A new procedure for extractionof carrier mobility in the presence of a high density ofinterface states found in MOSFETs with high-κ dielectricsis developed.
A notched-gate architecture aiming at reducing the parasiticcapacitance of a MOSFET is studied. The notched gate is usuallyreferred to as a local thickness increase of the gatedielectric at the feet of the gate above the source/drainextensions. Two-dimensional simulations are carried out toinvestigate the influence of the notched gate on the static anddynamic characteristics of MOSFETs. MOSFETs with optimizednotch profile exhibit a substantial enhancement in the dynamiccharacteristics with a negligible effect on the staticcharacteristics. Notched-gate MOSFETs are also experimentallyimplemented with the integration of a high-κ gatedielectric and a poly-SiGe/TiN bi-layer gate electrode.
Key words:CMOS technology, MOSFET, high-κ, gatedielectric, ALD, surface pre-treatment, metal gate, poly-SiGe,strained SiGe, surface-channel, buried-channel, notchedgate.
BARACCO, FLAVIO. "HERMANN WEYL AND HIS PHENOMENOLOGICAL RESEARCHES WITHIN INFINITESIMAL GEOMETRY." Doctoral thesis, Università degli Studi di Milano, 2019. http://hdl.handle.net/2434/638166.
Full textBörner, Robert. "Surface reactions of CO with Nickel :a multiple method approach using newly developed concepts." Doctoral thesis, Universite Libre de Bruxelles, 2002. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211457.
Full textBrumbach, Michael T. "Near Surface Composition and Reactivity of Indium Tin Oxide: An Evaluation Towards Surface Chemical Concepts and Relevance in Titanyl Phthalocyanine Photovoltaic Devices." Diss., The University of Arizona, 2007. http://hdl.handle.net/10150/195338.
Full textZaloum, Ronald. "Développement et validation d'un concept de surfaces de réponse pour évaluer la traitabilité des effluents." Metz, 1986. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/1986/Zaloum.Ronald.SMZ8628.pdf.
Full textIt was demonstrated that biological treatment response to changes in SRT, HRT, and influent total COD could be described by response surfaces for each effleunt parameter under investigation. Iso-response regions or lines could be obtained thus defining the ranges of SRT and organic load combinations which must be maintained in order to ensure a given effluent quality. The response surface for the most restrictive parameter will ensure that operating conditions are chosen in such a way as to maximize the performance of the system as a whole. This concept can assist in optimization, upgrading or retrofitting decision making. This study showed that the effect of SRT is significantly reduced beyond a value of 15 days. In addition, HRT has been shown to be equally important to SRT as a process control parameter with significant impact on system stability, sludge setleability and microbial composition, as well as on the performance. Process control can be achieved by modifying jointly or separately each parameter. The inequacy of the F/M ratio as an operating and design parameter was demonstrated experimentally through its lack of predictive potential. Also the usefulness of ATP as a biological performance indicator was assessed. This concept was developped at pilot scale using settled variable abbatoir waste and successfully applied to the operation of the full scale treatment facility receiving the same wastewater
Zaloum, Ronald. "Développement et validation d'un concept de surfaces de réponse pour évaluer la traitabilité des effluents." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37601964b.
Full textZaloum, Ronald Block Jean-Claude. "Développement et validation d'un concept de surfaces de réponse pour évaluer la traitabilité des effluents." Metz : Université de Metz, 2008. ftp://ftp.scd.univ-metz.fr/pub/Theses/1986/Zaloum.Ronald.SMZ8628.pdf.
Full textFournier, Pierre. "Frottement sec de matériaux céramiques monolithiques, composites et réfractaires : analyse à partir du concept "3ème corps"." Limoges, 1997. http://www.theses.fr/1997LIMO0030.
Full textFavrat, Jean-François. "Une expérience sur l'enseignement des surfaces a l'école élémentaire." Paris 7, 1986. http://www.theses.fr/1986PA077072.
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