Дисертації з теми "Effective cone"
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Okazaki, Ryotaro. "On an effective determination of Shintani's decomposition of the cone R+n." 京都大学 (Kyoto University), 1992. http://hdl.handle.net/2433/86217.
Повний текст джерелаKoyama, Shuji, Takahiko Aoyama, Nobuhiro Oda, and Chiyo Yamauchi-Kawaura. "Radiation dose evaluation in tomosynthesis and C-arm cone-beam CT examinations with an anthropomorphic phantom." American Institute of Physics, 2009. http://hdl.handle.net/2237/14184.
Повний текст джерелаHan, Sangmok. "Improved source code editing for effective ad-hoc code reuse." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/67583.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 111-113).
Code reuse is essential for productivity and software quality. Code reuse based on abstraction mechanisms in programming languages is a standard approach, but programmers also reuse code by taking an ad-hoc approach, in which text of code is reused without abstraction. This thesis focuses on improving two common ad-hoc code reuse approaches-code template reuse and code phrase reuse because they are not only frequent, but also, more importantly, they pose a risk to quality and productivity in software development, the original aims of code reuse. The first ad-hoc code reuse approach, code template reuse refers to programmers reusing an existing code fragment as a structural template for similar code fragments. Programmers use the code reuse approach because using abstraction mechanisms requires extra code and preplanning. When similar code fragments, which are only different by several code tokens, are reused just a couple of times, it makes sense to reuse text of one of the code fragments as a template for others. Unfortunately, code template reuse poses a risk to software quality because it requires repetitive and tedious editing steps. Should a programmer forget to perform any of the editing steps, he may introduce program bugs, which are difficult to detect by visual inspection, code compilers, or other existing bug detection methods. The second ad-hoc code reuse approach, code phrase reuse refers to programmers reusing common code phrases by retyping them, often regularly, using code completion. Programmers use the code reuse approach because no abstraction mechanism is available for reusing short yet common code phrases. Unfortunately, code phrase reuse poses a limitation on productivity because retyping the same code phrases is time-consuming even when a code completion system is used. Existing code completion systems completes only one word at a time. As a result, programmers have to repeatedly invoke code completion, review code completion candidates, and select a correct candidate as many times as the number of words in a code phrase. This thesis presents new models, algorithms, and user interfaces for effective ad-hoc code reuse. First, to address the risk posed by code template reuse, it develops a method for detecting program bugs in similar code fragments by analyzing sequential patterns of code tokens. To proactively reduce program bugs introduced during code template reuse, this thesis proposes an error-preventive code editing method that reduces the number of code editing steps based on cell-based text editing. Second, to address the productivity limitation posed by code phrase reuse, this thesis develops an efficient code phrase completion method. The code phrase completion accelerates reuse of common code phrases by taking non-predefined abbreviated input and expanding it into a full code phrase. The code phrase completion method utilizes a statistical model called Hidden Markov model trained on a corpus of code and abbreviation examples. Finally, the new methods for bug detection and code phrase completion are evaluated through corpus and user studies. In 7 well-maintained open source projects, the bug detection method found 87 previously unknown program bugs. The ratio of actual bugs to bug warnings (precision) was 47% on average, eight times higher than previous similar methods. The code phrase completion method is evaluated on the basis of accuracy and time savings. It achieved 99.3% accuracy in a corpus study and achieved 30.4% time savings and 40.8% keystroke savings in a user study when compared to a conventional code completion method. At a higher level, this work demonstrates the power of a simple sequence-based model of source code. Analyzing vertical sequences of code tokens across similar code fragments is found useful for accurate bug detection; learning to infer horizontal sequences of code tokens is found useful for efficient code completion. Ultimately, this work may aid the development of other sequence-based models of source code, as well as different analysis and inference techniques, which can solve previously difficult software engineering problems.
by Sangmok Han.
Ph.D.
Dunsmore, Alastair Peter. "Investigating effective inspection of object-oriented code." Thesis, University of Strathclyde, 2002. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=9349.
Повний текст джерелаSoares, Maria Rosangela. "Avaliação dosimétrica de protocolos de exame de tomografia computadorizada de feixe cônico." Universidade Federal de Sergipe, 2016. https://ri.ufs.br/handle/riufs/5242.
Повний текст джерелаThis PhD thesis, addresses the issue of evaluation of cone beam computed tomography, CBCT, scanning protocols, was introduced in dental radiology at the end of the 1990s, and it quickly became a fundamental examination for various procedures. Its main characteristic, the difference of medical CT is the beam shape. This study aimed to calculate the absorbed dose in eight tissues / organs of the head and neck, and to estimate the effective dose in 13 protocols and two techniques (stitched FOV e single FOV) of 5 equipment of different manufacturers of cone beam CT. For that purpose, a female anthropomorphic phantom was used, representing a default woman, in which were inserted thermoluminescent dosimeters at several points, representing organs / tissues with weighting values presented in the standard ICRP 103. The results were evaluated by comparing the dose according to the purpose of the tomographic image. Among the results, there is a difference up to 325% in the effective dose in relation to protocols with the same image goal. In relation to the image acquisition technique, the stitched FOV technique resulted in an effective dose of 5.3 times greater than the single FOV technique for protocols with the same image goal. In the individual contribution, the salivary glands are responsible for 31% of the effective dose in CT exams. The remaining tissues have also a significant contribution, 36%. The results drew attention to the need of estimating the effective dose in different equipment and protocols of the market, besides the knowledge of the radiation parameters and equipment manufacturing engineering to obtain the image.
Na presente tese de doutoramento foi abordada a temática da avaliação de protocolos de exame de tomografia computadorizada de feixe cônico - TCFC, que foi iniciada na radiologia odontológica no fim da década de 1990 e rapidamente tornou-se um exame fundamental para diversos procedimentos. Sua principal característica, que a diferencia da tomografia computadorizada médica, é a forma do feixe. Assim, este estudo objetivou calcular a dose absorvida em 8 tecidos/órgãos da cabeça e pescoço e estimar a dose efetiva em 13 protocolos e duas técnicas (stitched FOV e single FOV) de 5 equipamentos diferentes fabricantes de tomografia computadorizada de feixe cônico. Para isto, foi utilizado um simulador antropomórfico feminino, representando uma mulher padrão, onde foram inseridos dosímetros termoluminescentes em diversos pontos, representando órgãos e tecidos com valores de ponderação apresentados na norma ICRP 103. Os resultados foram avaliados, comparando-se a dose de acordo com o objetivo da imagem tomográfica. Dentre os resultados, observou-se uma diferença de até 325 % de dose efetiva em relação a protocolos com o mesmo objetivo de imagem. Em relação à técnica de obtenção de imagem, a técnica stitched FOV resultou em uma dose efetiva até 5,3 vezes maior que a single FOV para protocolos com o mesmo objetivo de imagem. Na contribuição individual, as glândulas salivares são responsáveis por 31% da dose efetiva, nos exames tomográficos. Os tecidos restantes também apresentaram uma contribuição significativa, 36 %. Os resultados apontam a necessidade de se estimar a dose efetiva nos diversos equipamentos e protocolos presentes no mercado, além de conhecer os parâmetros de radiação e a engenharia de fabricação dos equipamentos para a obtenção da imagem.
Daqing, Huang, and Xie Qiu-Cheng. "THE TIME-ASSISTING CODE TECHNIQUE THAT IS AN EFFECTIVE COUNTERMEASURE TO REPEAT JAMMING." International Foundation for Telemetering, 1990. http://hdl.handle.net/10150/613486.
Повний текст джерелаIn this Paper, the time-assisting code techique capable of defeating the repeat jamming is presented. The construction and antijamming performance of this technique are described and analyzed. This technique not only is robust to repeat jamming of Remote Control/Telemetring and Communication Systems, but also is used in multi-address remote control/ telemetring, multi-address communication and radar systems.
Mitic, Ljiljana. "Enviropreneurial management : an effective approach to cope with the ecological challenge." Thesis, University of Plymouth, 2000. http://hdl.handle.net/10026.1/2521.
Повний текст джерелаFlanders, Melanie Good Glenn E. "Characteristics of effective mid-level leaders in higher education." Diss., Columbia, Mo. : University of Missouri--Columbia, 2008. http://hdl.handle.net/10355/7106.
Повний текст джерелаMalatji, Tsholofelo M. "The development of an effective jam code against the conical-scan seeker." Diss., University of Pretoria, 2020. http://hdl.handle.net/2263/73210.
Повний текст джерелаDissertation (MEng)--University of Pretoria, 2020.
Electrical, Electronic and Computer Engineering
MEng
Unrestricted
Jowah, Enoch Larry. "Critical core competencies for effective strategic leadership in project management." Thesis, Nelson Mandela Metropolitan University, 2013. http://hdl.handle.net/10948/d1017230.
Повний текст джерелаMalevris, N. "An effective approach for testing program branches and linear code sequences and jumps." Thesis, University of Liverpool, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233799.
Повний текст джерелаTarasca, Nicola. "Geometric cycles on moduli spaces of curves." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, 2012. http://dx.doi.org/10.18452/16518.
Повний текст джерелаThe aim of this thesis is the explicit computation of certain geometric cycles in moduli spaces of curves. In recent years, divisors of $\Mbar_{g,n}$ have been extensively studied. Computing classes in codimension one has yielded important results on the birational geometry of the spaces $\Mbar_{g,n}$. We give an overview of the subject in Chapter 1. On the contrary, classes in codimension two are basically unexplored. In Chapter 2 we consider the locus in the moduli space of curves of genus 2k defined by curves with a pencil of degree k. Since the Brill-Noether number is equal to -2, such a locus has codimension two. Using the method of test surfaces, we compute the class of its closure in the moduli space of stable curves. The aim of Chapter 3 is to compute the class of the closure of the effective divisor in $\M_{6,1}$ given by pointed curves [C,p] with a sextic plane model mapping p to a double point. Such a divisor generates an extremal ray in the pseudoeffective cone of $\Mbar_{6,1}$ as shown by Jensen. A general result on some families of linear series with adjusted Brill-Noether number 0 or -1 is introduced to complete the computation.
Preston, Angela I., Charles L. Wood, and Sara Beth Hitt. "Using Effective Strategies to Enhance Core Math Instruction." Digital Commons @ East Tennessee State University, 2016. https://dc.etsu.edu/etsu-works/4063.
Повний текст джерелаGibson, Maryika Ivanova. "Effective Strategies for Recognition and Treatment of In-Hospital Strokes." ScholarWorks, 2019. https://scholarworks.waldenu.edu/dissertations/6756.
Повний текст джерелаPeltonen, Joanna. "Effective Spatial Mapping for Coupled Code Analysis of Thermal–Hydraulics/Neutron–Kinetics of Boiling Water Reactors." Doctoral thesis, KTH, Kärnkraftsäkerhet, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-122088.
Повний текст джерелаQC 20130516
Young, Whitney Nash. "Supporting Elementary Teachers In Effective Writing Instruction Through Professional Development." ScholarWorks, 2015. https://scholarworks.waldenu.edu/dissertations/1637.
Повний текст джерелаJohnson, Stuart Clark. "Section 103(b) (4) (A) of the internal revenue code: can the tax code provide an efficient and effective low income "housing program"? ; (an economic analysis)." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/94470.
Повний текст джерелаM.A.
Diany, Mohammed. "Détermination de la largeur effective des joints d'étanchéité utilisée dans le code ASME pour le calcul des brides /." Montréal : École de technologie supérieure, 2005. http://wwwlib.umi.com/cr/etsmtl/fullcit?pMR06030.
Повний текст джерела"Mémoire présenté à l'École de technologie supérieure comme exigence partielle à l'obtention de la maîtrise en génie mécanique". Bibliogr.: f. [139]-141. Également disponible en version électronique.
Diany, Mohammed. "Détermination de la largeur effective des joints d'étanchéité utilisée dans le code ASME pour le calcul des brides." Mémoire, École de technologie supérieure, 2005. http://espace.etsmtl.ca/351/1/DIANY_Mohammed.pdf.
Повний текст джерелаClark, Donald S. "Components of effective reading instruction for reading disabled students, an evaluation of a program combining code- and strategy-instruction." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ63618.pdf.
Повний текст джерелаVan, Zyl A. J. P. (Andries Jakobus Petrus). "Synthesis, characterization and testing of nano-structured particles for effective impact modification of glassy amorphous polymers." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53609.
Повний текст джерелаENGLISH ABSTRACT: The synthesis of structured nanoparticles, in particular core/shells, IS of great technological and economical importance to modem materials science. One of the advantages of structured particles is that they can be synthesized with either a solid core (albeit soft or hard) or a liquid core (of varying viscosity). This adds to the versatility of structured particles and their relevance to a majority of industrial and commercial endapplications. The synthesis of core/shell particles with liquid cores was investigated for the effective impact modification of glassy amorphous polymers. Polybutyl acrylate was chosen as the shell due to its rubbery nature. Hexadecane functioned as the core oil and facilitated osmotic stability by being a suitable hydrophobe for the miniemulsion synthesis. Polymer synthesis was preceded by the prediction of particle morphology by using thermodynamic prediction models. Core/shell particles with liquid cores were synthesized via miniemulsion polymerization. This resulted in the direct introduction of core-oil and monomer into the miniemulsion droplets. Polymerization was achieved in situ, resulting in the formation of particles with the desired morphology. For additional strength, stability and matrix mixing capabilities, methyl methacrylate (MMA) was grafted onto the initial core/shell particles. The obtained morphology was in contradiction with the predicted morphology, thus pointing to strong kinetic influences during the polymerization process. These influences could be attributed to surface anchoring of polymer chains due to the initiator (KPS) used, the establishment of the polymerization locus as well as the increase in viscosity at the polymerization locus. To test these influences a surface-inactive initiating species (AIBN) and an interfacial redox initiating species (cumyl hydroperoxide/Fe/") were used. Use of the former resulted in the formation of solid polymer particles due to homogeneous polymerization throughout the droplet, thus leading to an inverse core/shell morphology as a result of thermodynamic considerations. The redox initiator promoted kinetic influences as a result of fast polymerization kinetics at the droplet/water interface. This, as well as the increase in viscosity, facilitated the production of core/shell particles. To obtain core/shell particles with the desired size, the influence of surfactant concentration was investigated. Capillary hydrodynamic fractionation (CHDF) was used to determine the particle size of the initial core/shell particles as well as the size of the MMA-grafted core/shell particles. The area stabilized per surfactant molecule was calculated stoichiometrically and compared to "classical" miniemulsion results, i.e. data generated from the synthesis of polymeric latexes in the presence of a hydrophobe, but at a much lower hydrophobe:monomer ratio than was used here. The influence of methanol as well as the possibility of scaling-up the process was also investigated. The study was further expanded to the investigation of living miniemulsion polymerization techniques to control the molecular architecture of synthesized core/shell latexes. The influence of different RAFT agents, initiators and monomers were investigated on the core/shell formation properties of the investigated systems. The combined effects of establishing the polymerization locus as well as increased polymerization kinetics, thus increasing the viscosity at the polymerization locus, lead to the successful formation of liquid- filled core/shell particles. To conclude, the ability of the synthesized core/shell particles to induce impact modification in glassy amorphous polymers was investigated. Results showed that incorporation of these particles could effectively modify the intrinsic properties of the investigated polymers, resulting in a brittle-to-ductile transition. Improved impact results of the investigated glassy matrix were obtained. Keywords: core/shell, liquid-filled, RAFT, miniemulsion, impact modification
AFRIKAANSE OPSOMMING: Die sintese van gestruktureerde nano-partikels, meer spesifiek kern/skil partikels, is van onskatbare tegnologiese en ekonomiese belang vir moderne materiaalkunde. Een van die voordele van hierdie tipe partikels is dat sintese kan geskied met 'n soliede kern (hard of sag) of vloeistofkern (met wisselende viskositeit). Dit dra by tot die veelsydigheid van gestruktureerde partikels en dus tot grootskaalse aanwending in industriële en kommersiële toepassings. Die sintese van kern/skiI partikels met vloeistofkerne is ondersoek met die oog op effektiewe slagsterkte modifikasie van glasagtige amorfe polimere. Polibutielakrilaat is gekies as skil-polimeer op grond van sy rubberige voorkoms. Heksadekaan moes funksioneer as die kern-olie, maar het ook bykomende osmotiese stabiliteit verleen tydens die miniemulsie-polimerisasie proses. Dit is as gevolg van die gepaste hidrofobiese eienskappe van heksadekaan. Polimeer sintese is voorafgegaan deur die voorspelling van partikel morfologie met behulp van termodinamies gebaseerde voorspellingsmodelle. Kern/skil partikels is gesintetiseer deur middel van 'n miniemulsie-polimerisasie reaksie wat die direkte inkorporering van kern-olie en monomeer in die miniemulsiedruppel teweeg bring. Polimerisasie vind in situ (lat. vir in die oorspronklike plek, m.a.w. binne-in die druppel) plaas en lei tot die vorming van partikels met die gewenste morfologie. Metielmetakrilaat is ge-ent op die oorspronklike kern/skil partikels om addisionele sterkte, stabiliteit en vermenging met die matriks polimeer te bewerkstellig. Die verkrygde morfologie is teenstrydig met die voorspelde morfologie, wat dus die teenwoordigheid van sterk kinetiese invloede aandui. Hierdie invloede kan toegeskryf word aan die oppervlak-aktiewe afsetter (KPS, kaliumpersulfaat) wat gebruik is, die daarstelling van die polimerisasie lokus asook die toename in viskositeit by die lokus van polimerisasie. Om hierdie invloede te toets is 'n oppervlak-onaktiewe afsetter (AIBN, asobisisobutironitriel) en intervlak redoks-afsetter (kumielhidroperoksied/Pe'") gebruik. Gebruik van eersgenoemde het die vorming van soliede partikels teweeg gebring. Dit is as gevolg van homogene polimerisasie in die druppel en dus die ontstaan van omgekeerde kern/skiI partikels weens termodinamiese oorwegings. Die redoks-afsetter het egter die kinetiese oorwegings bevoordeel as gevolg van vinnige polimerisasiekinetika by die druppel/water intervlak. Dit, tesame met die toename in viskositeit, maak die produksie van kern/skil partikels moontlik. Vir die verkryging van kern/skiI partikels met die gewenste partikelgrootte is die invloed van die seep konsentrasie ondersoek. CHDF (eng. capillary hydrodynamic fractionation) is gebruik om die partikelgrootte van die oorspronklike kern/skiI partikels, sowel as dié ge-ent met metielmetakrilaat, te bepaal. Die area gestabiliseer per seepmolekule is bereken d.m.v. stoichiometrie en vergelyk met "klassieke" miniemuisie data, d.i. data verkry deur die sintese van latekse in die teenwoordigheid van 'n hidrofoob, maar teen 'n baie laer hidrofoob:monomeer-verhouding as wat hier gebruik is. Die invloed van metanol, asook die moontlikheid om die reaksie op te skaal, is ondersoek. Die studie is verder uitgebrei om die invloed van lewende miniemulsie-polimerisasie tegnieke in te sluit, om sodoende beheer uit te oefen oor die molekulêre argitektuur van die gesintetiseerde latekse. Die invloed van verskeie RAFT (eng. reversible additionfragmentation chain transfer) agente, afsetters en monomere op die kern/skiI vormingsmoontlikhede van die bestudeerde stelsels, is ondersoek. Die gesamentlike effek van die daarstelling van die polimerisasie lokus en dus die verhoging van die viskositeit by die lokus, lei tot die suksesvolle vorming van vloeistof-gevulde kern/skiI partikels. Laastens is die invloed van die gesintetiseerde kern/skil partikels op die slagsterkte van glasagtige amorfe polimere ondersoek. Resultate dui daarop dat die insluiting van hierdie partikels kan lei tot die effektiewe verandering van die intrinsieke eienskappe van die bestudeerde polimere, en dus 'n oorgang van bros na rekbaar kan veroorsaak. 'n Verbetering in die slagsterkte resultate van die bestudeerde glasagtigte matriks is ook waargeneem.
Mbele, Nomalizo Constance. "The psychological experiences of learners affected by HIV/AIDS pandemic / Nomalizo Constance Mbele." Thesis, North-West University, 2005. http://hdl.handle.net/10394/3107.
Повний текст джерелаThesis (M.Ed.)--North-West University, Vaal Triangle Campus, 2006.
Chanel, Clément. "Diffusion électromagnétique par un sol : Prise en compte d'un fil enfoui par l'introduction d'une impédance effective dans un code FDTD." Nantes, 2015. https://archive.bu.univ-nantes.fr/pollux/show/show?id=504ca20a-3305-424a-9871-beabcbbf294e.
Повний текст джерелаThis thesis studies the electromagnetic wave scattering from a slightly rough soil in the presence of a buried wire. The problem is assumed to be two-dimensional (2D) (the rough surface depends only on one space variable) and the media separating the boundaries are assumed to be homogeneous. Firstly, a sensor was built up to measure the profiles of the rough soil in order to determine its statistical characteristics, such as the standard deviation of the heights and the correlation length. These parameters allow us to choose the adequate asymptotic electromagnetic scattering model devoted to our application: The Small Perturbation Method (SPM), valid for surface heights much smaller than the Radar wavelength. Then, from the SPM, the surface currents are expressed analytically, according to the order of expansion of the method and to the nature of the incident wave. The specific case of a plane incident wave is studied. In addition, the numerical results are compared to those obtained by a rigorous numerical method: the Method of Moments. Finally, the analytical expressions of the scattered field, obtained by SPM, allow us to derive the coherent reflection coefficient and the associated effective surface impedance. The purpose is to implement this impedance into a 3D FDTD simulation platform, in which the buried wire is taken into account
BENSADOUN, GILBERT. "Etude statistique de vingt parametres biologiques effectuee chez six cent trente-sept nouveau-nes en cote d'ivoire." Aix-Marseille 2, 1989. http://www.theses.fr/1989AIX22978.
Повний текст джерелаStrentz, Thomas. "An Evaluation of Two Training Programs Designed to Enable Hostages to Cope More Effectively with Captivity Stress." VCU Scholars Compass, 1986. https://scholarscompass.vcu.edu/etd/5532.
Повний текст джерелаPatel, Seema, Hallie Rhoads, Bre Stuart, and Haley DeRosa. "Effectively Navigating Your Way Through the Death of a Child Using Family Stress Theory." Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/secfr-conf/2019/schedule/22.
Повний текст джерелаIsildak, Murat. "Use Of Helical Wire Core Truss Members In Space Structures." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610553/index.pdf.
Повний текст джерелаDi, Chicco Augusto. "Optimization of a calculation scheme through the parametric study of effective nuclear cross sections and application to the estimate of neutronic parameters of the ASTRID fast nuclear reactor." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
Знайти повний текст джерелаRaddo, Thiago Roberto. "Next generation access networks: flexible OCDMA systems and cost-effective chaotic VCSEL sources for secure communications." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/18/18155/tde-31082017-093005/.
Повний текст джерелаOs avanços relacionados a tecnologia fotônica ampliaram o alcance das redes de comunicação óptica tanto em instalações de estabelecimentos comerciais quanto em residências, permitindo que novos serviços e tecnologias fossem entregues aos clientes. A próxima onda de inovação certamente gerará inúmeras oportunidades proporcionadas pela popularidade de soluções emergentes e aplicações como a Internet tátil, a telemedicina e a geração de conteúdo 3-D em tempo real, tornando-os parte da vida cotidiana. No entanto, para suportar a crescente demanda de tráfego atual, uma maior capacidade e segurança, alocação flexível de largura de banda e custo-eficiência tornaram-se requisitos cruciais para as tecnologias candidatas a futuras redes de acesso óptico. Para este fim, a tecnologia de acesso múltiplo por divisão de código óptico (OCDMA) é considerada um candidato em potencial, particularmente devido a características como transmissões assíncronas, distribuição flexível de banda larga e suporte a serviços diferenciados na camada física, para citar apenas alguns. Neste contexto, esta tese propõe novos formalismos matemáticos para a taxa de erro de bits, taxa de transferência de pacotes e atraso de pacotes para avaliar o desempenho de redes OCDMA flexíveis capazes de fornecer transmissões em múltiplas qualidades de serviço (QoS) de acordo com as necessidades dos usuários. Os formalismos analíticos propostos não requerem o conhecimento a priori das sequências de código dos usuários, o que significa que o desempenho da rede pode ser abordado de forma simples e direta usando apenas os parâmetros de código. Além disso, os formalismos analíticos desenvolvidos representam um número geral de classes de usuários distintos, bem como a probabilidade geral de interferência entre os usuários. Portanto, esses formalismos podem ser aplicados com sucesso na avaliação de desempenho de redes OCDMA flexíveis não apenas em qualquer número de classes de usuários em uma rede, mas também para a maioria dos códigos de espalhamento com boas propriedades de correlação. A expressão de taxa de transferência de pacotes é derivada assumindo aproximações de Poisson, binomial e de cadeia de Markov para as chegadas de pacotes compostos, com a última definida como benchmark. Em seguida, é mostrado via simulação numérica que a expressão baseada em Poisson não é apropriada para uma estimativa confiável de taxa de transferência quando comparada aos resultados de benchmark (Markov). A equação de taxa de transferência binomial, por sua vez, fornece resultados tão precisos quanto o benchmark. Além disso, a taxa de transferência binomial é numericamente mais conveniente e computacionalmente eficiente quando comparada com abordagem de Markov, enquanto esta última é computacionalmente dispendiosa, particularmente se o número de usuários é grande. As expressões de taxa de erro de bit (BER) são derivadas considerando distribuições gaussianas e binomiais para a interferência de acesso múltiplo e é mostrado por meio de simulações numéricas que o desempenho exato de redes OCDMA flexíveis é obtido somente com a expressão binomial de BER. Esta tese também propõe e investiga uma arquitetura de rede para o tráfego de protocolo de Internet sobre OCDMA flexível com suporte a transmissões de QoS e de múltiplas taxas, que é independente do código de espalhamento empregado e não requer qualquer nova tecnologia de processamento óptico. Além disso, o desempenho da rede assume que os usuários transmitem de forma assíncrona usando receptores baseados em esquemas de detecção direta de modulação de intensidade. As simulações numéricas mostraram que a rede proposta possui melhor desempenho quando seus usuários são definidos com peso de código alto ou quando a utilização do canal é baixa. O desempenho da BER e da taxa de transferência de pacotes de uma rede OCDMA que fornece transmissões de múltiplas taxas por meio de uma técnica multi-código com dois códigos atribuídos a cada usuário é também abordado. Os resultados numéricos mostram que esta técnica supera as técnicas clássicas baseadas no código de comprimento múltiplo. Finalmente, esta tese aborda uma nova tecnologia que pode levar a níveis mais elevados de segurança na camada física de redes ópticas. Esta tecnologia consiste na geração de caos determinístico a partir de um laser de emissão superficial com cavidade vertical (VCSEL). A dinâmica caótica é gerada através da aplicação de forças mecânicas em um VCSEL comercial usando um suporte simples e facilmente replicável. O caos determinístico é então alcançado, pela primeira vez, sem qualquer complexidade adicional de realimentação óptica, modulação de parâmetros ou injeção óptica. A simplicidade do sistema proposto, o qual se baseia inteiramente em componentes de baixo custo e que são facilmente encontrados, abre o caminho para o uso de dispositivos VCSEL comerciais para aplicações baseadas em caos. Este gerador de caos óptico tem o potencial não só de pavimentar o caminho para novas plataformas de segurança em redes ópticas, como, por exemplo, ocultar com êxito as informações do usuário em um sinal imprevisível e aleatório contra eventuais invasores, como também tem o potencial de influenciar aplicações de caos emergentes inicialmente limitadas ou inviáveis devido à falta de soluções de baixo custo. Além disso, ele conduz o caminho para a realização futura de aplicações emergentes com alta integridade e escalabilidade, tais como matrizes bidimensionais de dispositivos caóticos que compreendem centenas de fontes individuais para aumentar as necessidades de geração de bit aleatória, criptografia ou redes quânticas de grande escala.
Abdul, Hamid Nor Hayati. "Seismic damage avoidance design of warehouse buildings constructed using precast hollow core panels." Thesis, University of Canterbury. Civil Engineering, 2006. http://hdl.handle.net/10092/1153.
Повний текст джерелаKhan, Alamgir 1979. "Cálculo eficiente de alta qualidade Ab Initio e DFT das atividades Raman de espalhamento dependentes da frequência de moléculas de interesse ambiental." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/249082.
Повний текст джерелаTese (doutorado) - Universidade Estadual de Campinas, Instituto de Química
Made available in DSpace on 2018-08-23T04:27:58Z (GMT). No. of bitstreams: 1 Khan_Alamgir_D.pdf: 2306325 bytes, checksum: a39e71c04424c25645e57f5fe0ab453c (MD5) Previous issue date: 2013
Resumo: Neste trabalho novas metodologias para cálculo das intensidades Raman absolutas de moléculas na fase gasosa foram desenvolvidas para uma série de moléculas pequenas, usando o método ab initio (CCSD) e a teoria do funcional de Densidade (DFT) (PBE0, LB94 e CAM-B3LYP) dentro da Teoria de Polarizabilidade de Placzek. A velocidade em cálculo junto com economia nos recursos computacionais foram estudadas usando dos conjuntos de bases polarizadas (potential efetivo de caroço) pSBKJC e pStuttgart desenvolvidos pelo nosso grupo através do procedimento "polarização eléctrica de Sadlej". Os resultados da metodolgia proposta em comparação com conjunto de bases Sadlej-pVTZ como referência, em níveis CCSD e DFT mostram acordos quantitativos nas propriedades e uma redução no tempo computacional. Na segunda parte deste trabalho, estas metodologias foram aplicadas para uma série de moléculas grandes de pesticidas organoclorados, ou seja; DDT e cinco análogos estruturas e de cinco pesticidas que contêm o grupo norborneno, utilizando métodos DFT (PBE0 e CAMB3LYP) para o cálculo das propriedades Raman. O conjunto de bases permitiram a redução o número de elétróns de 6 para 4 para carbono, 8 para 6 para oxigênio, 16 para 6 para o enxofre e 17 para 7 para o cloro. Assim, estas reduções de número de elétrons dá 50% de economia em recursos computacionais e tempo para os cálculos das propriedades ópticas das moléculas estudadas
Abstract: In this work new methodologies for calculating the absolute Raman intensities originating from gas phase molecules were developed for a set of small tests molecules, using ab initio quantum-mehancial (CCSD) and Density functional (PBE0, LB94 and CAMB3LYP functionals) methods within Placzek¿s Polarizability Theory. The speed-up in computation along with economy in the computational resources were studied using a newly polarized effective core potential basis set pSBKJC and pStuttgart developed by our group through Sadlej¿s electric polarization procedure. The results of the proposed methodology in comparison with Sadlej-pVTZ as reference basis set at CCSD and DFT levels show quite a good quantitative agreements in the properties with a valuable reduction in computational time and resources. In the second part of this work, the methodologies being assessed were applied for a series of large Organochlorinated pesticides ou seja, DDT and five structurally related pesticides and of five pesticides containing the Norbornene group, using DFT methods (PBE0 and CAMB3LYP functionals). The basis set allowed the reduction of the number of electrons from 6 to 4 for carbon, 8 to 6 for oxygen, 16 to 6 for sulfur and 17 to 7 for chlorine atoms. Thus, these reductions in electrons give more than 50% of savings in computer resources and time for the calculations of optical properties of reference molecules of environmental interests
Doutorado
Físico-Química
Doutor em Ciências
Introïni, Clément. "Interaction entre un fluide à haute température et un béton : contribution à la modélisation des échanges de masse et de chaleur." Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0074/document.
Повний текст джерелаIn the late phases of some scenario of hypothetical severe accident in Pressurized Water Reactors, a molten mixture of core and vessel structures, called corium, comes to interact with the concrete basemat. The safety numerical tools are lumped parameter codes. They are based on a large averaged description of heat and mass transfers which raises some uncertainties about the multi-scale description of the exchanges but also about the adopted boundary layer structure in the vicinity of the ablation front. In this context, the aim of this work is to tackle the problem of the boundary layer structure by means of direct numerical simulation. This work joins within the more general framework of a multi-scale description and a multi-scale modeling, namely from the local scale associated with the vicinity of the ablation front to the scale associated with the lumped parameter codes. Such a multi-scale description raises not only the problem of the local description of the multiphase multicomponent flow but also the problem of the upscaling between the local- and the macro-scale which is associated with the convective structures within the pool of corium. Here, we are particularly interested in the building of effective boundary conditions or wall laws for macro-scale models. The difficulty of the multiphase multicomponent problem at the local scale leads us to consider a relatively simplified problem. Effective boundary conditions are built in the frame of a domain decomposition method and numerical experiments are performed for a natural convection problem in a stamp shaped cavity to assess the validity of the proposed wall laws. Even if the treated problem is still far from the target applications, this contribution can be viewed as a first step of a multi-scale modeling of the exchanges for the molten core concrete issue. In the more complicated case of multiphase multicomponent flows, it is necessary to have a direct numerical simulation tool of the flow at the local scale to build wall laws for macro-scale models. Here, the developed tool corresponds to a Cahn-Hilliard/Navier-Stokes model for a two-phase compositional system. It relies on a description of the system by three volume fractions and on a free energy composed by a two-phase part and a compositional part. The governing equations are derived in the frame of the thermodynamic of irreversible processes. They are solved on the basis of a finite element application of the object-oriented software component library PELICANS. Several numerical experiments illustrate the validity and the potentialities of application of this tool on two-phase compositional problems. Finally, using the developed tool, we tackle by means of direct numerical simulation the problem boundary layer structure in the vicinity of the ablation front for limestone-sand and siliceous concretes
Tran, Chi Thanh. "The Effective Convectivity Model for Simulation and Analysis of Melt Pool Heat Transfer in a Light Water Reactor Pressure Vessel Lower Head." Doctoral thesis, Stockholm : Division of Nuclear Power Safety, Royal Institute of Technology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10671.
Повний текст джерелаOkonkwo, Ejike C. "An Investigation of the Skill Sets Needed by Information Systems Managers to Cope Effectively with the Transition from Legacy Systems to Client/Server and Distributed Computing Environments." NSUWorks, 2003. http://nsuworks.nova.edu/gscis_etd/756.
Повний текст джерелаTran, Chi Thanh. "Development, validation and application of an effective convectivity model for simulation of melt pool heat transfer in a light water reactor lower head." Licentiate thesis, Stockholm : Fysik, Kungliga Tekniska högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4559.
Повний текст джерелаRiou, Jerôme. "Étude de l'influence de l'enseignement du code alphabétique sur la qualité des apprentissages des élèves de cours préparatoire." Thesis, Université Clermont Auvergne (2017-2020), 2017. http://www.theses.fr/2017CLFAL024/document.
Повний текст джерелаOur doctoral research focuses on the influence of phonics instruction on first-grade students’ progress. Its purpose is to identify effective teaching practices and to contribute to the training of teachers. This research is part of a larger study conducted by Roland Goigoux, which aimed to assess the influence of reading and writing on the quality of learning.The first part of our research examines causal relationships between the characteristics of phonics instruction and students’ performances in decoding and spelling. First, we study the influence of the speed of teaching of grapheme-phoneme relationships (tempo) and of the decodable part of texts used to teach reading (rendement effectif). Our results reveal a significant influence of these two variables on the quality of learning, this influence being different according to students’ initial levels. Besides, we propose a planning of the phonics instruction based on the theoretical frequency of the grapheme-phoneme correspondences in texts written in standard French which can serve as references for the teachers. We also study the effects of the teaching time allocated to encoding tasks on reading achievement, effects which appear to be significant and positive but which vary according to the nature of the tasks and to students’ characteristics.In the second part of our dissertation, we attempt to analyze and document teaching practices of experienced first-grade teachers for training purposes. We analyze a reference situation of the teaching of reading and writing from the video recordings of thirty six collective sessions of reading. Then, we describe prototypical teaching scenarios and lay the foundations for a training intended to develop the professional skills of the teachers. Specifically, we raise the issue of the relationship between the resolution of decoding and understanding tasks and the autonomy that decoding success afforded the students. We finally present the digital platform we designed, which allows calculating the decodable part of texts used during reading instruction. This platform named Anagraph has been designed to help teachers plan the study of the grapheme-phoneme correspondences and to choose texts adapted to their teaching
Pokharel, Narayan. "Behaviour and design of sandwich panels subject to local buckling and flexural wrinkling effects." Thesis, Queensland University of Technology, 2003. https://eprints.qut.edu.au/15890/1/Narayan_Pokharel_Thesis.pdf.
Повний текст джерелаPokharel, Narayan. "Behaviour and Design of Sandwich Panels Subject to Local Buckling and Flexural Wrinkling Effects." Queensland University of Technology, 2003. http://eprints.qut.edu.au/15890/.
Повний текст джерелаMcAllister, Steve Randolph. "Implementation of Food Safety Regulations in Food Service Establishments." ScholarWorks, 2018. https://scholarworks.waldenu.edu/dissertations/5902.
Повний текст джерелаWarnock, Teresa Georgeanne. "School System Improvement through Building Leadership, Adult Learning, and Capacity: A Consideration of Instructional Rounds as a Systemic Improvement Practice." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1062801/.
Повний текст джерелаSarai, Leandro. "Análise jurídica das medidas prudenciais preventivas no âmbito do sistema financeiro nacional." Universidade Presbiteriana Mackenzie, 2014. http://tede.mackenzie.br/jspui/handle/tede/1117.
Повний текст джерелаCoordenação de Aperfeiçoamento de Pessoal de Nível Superior
The actual stage of capitalism is characterized by financialization of economy. This fact associated to the importance which financial institutions already had in the financial system strengthens their relevance at the same time that attract a lot of issues about the appropriated treatment they have receipt in order to continue in a normal operation and, in the eventual and natural crisis, the manner to reduce its negative effects and to contain the contagion. The universal character of the financial activity struggles with the local nature of sovereignty, which controls money and the operations of the institution in its territory. An international consensus leads to a pursuit for convergence in financial regulation, in order to avoid regulatory arbitrage and competitive problems, what is shown manly through the Basel Committee on Banking Supervision recommendations. Among these recommendations, there are the Core Principles for Effective Banking Supervision, which, in its turn, supports the need of flexible and quick instruments to supervisors adopt prompt measures to maintain the institution of the financial system operating in a prudential manner at the same time that these measures intend to avoid situation in what a special regime be the only alternative, with the problems associated with it. These are the preventive prudential measures, which will be analyzed in this dissertation, according to Brazilian law.
A fase presente do capitalismo é caracterizada pela financeirização da economia. Esse fato somado à importância que as instituições financeiras já possuíam no sistema financeiro reforça sua relevância ao mesmo tempo em que atrai uma série de preocupações com o tratamento apropriado que devem receber para que se mantenham em adequado funcionamento e para que, nas eventuais e naturais crises, sejam minoradas as consequências danosas e contidos o efeito de contágio. O caráter universal da atividade financeira se choca com a natureza local da soberania que controla em seu limitado território a moeda e o funcionamento das instituições. Um consenso internacional surge para buscar uma convergência na regulação dessa atividade, de modo a evitar arbitragem regulatória e problemas concorrenciais, o que se vê principalmente pelas recomendações oriundas do Comitê de Basileia de Supervisão Bancária. Entre essas recomendações, encontram-se os Princípios Básicos para uma Supervisão Bancária Eficaz, que, por sua vez, pregam a necessidade de instrumentos flexíveis e ágeis para as autoridades supervisoras adotarem prontas medidas para que as instituições do sistema financeiro se mantenham dentro dos limites prudenciais, com o intuito de evitar situações em que a decretação de um regime especial seja a única alternativa, com os males que lhe são inerentes. Essas são as medidas prudenciais preventivas, cuja análise, sob o ponto de vista jurídico, será realizada no presente trabalho.
Hliwa, Mohamed. "Traitement simplifie des interactions moleculaires en chimie quantique." Toulouse 3, 1988. http://www.theses.fr/1988TOU30038.
Повний текст джерелаGold, Daniel. "Lobbying Regulation in Canada and the United States: Political Influence, Democratic Norms and Charter Rights." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/40908.
Повний текст джерелаFujdiak, Radek. "Analýza a optimalizace datové komunikace pro telemetrické systémy v energetice." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-358408.
Повний текст джерела"The effective cone on symmetric powers of curves." STATE UNIVERSITY OF NEW YORK AT STONY BROOK, 2009. http://pqdtopen.proquest.com/#viewpdf?dispub=3338163.
Повний текст джерелаHo, Chang-Hung, and 何常弘. "Estimation of the Effective Dose of Cone Beam CT Using the CTDI Phantom." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/18273474415557072327.
Повний текст джерела中臺科技大學
醫學影像暨放射科學系暨研究所
103
CBCT is a new modality in dental radiology that has rapidly become popular. When selecting an appropriate examination technique for each patient, the ALARA principle should be followed. The purpose of study was evaluated three methods for calculating effective dose, CT dose index (CTDI), dose–area product (DAP) and TLD for a cone beam CT (CBCT) device. CTDI100 measurements were performed in a CT head dose phantom with a pencil ion chamber. The DAP value was determined with a plane-parallel transmission ionization chamber connected to an electrometer. Organ dose measurements were performed using TLD dosimeters that were in the 19 most radiosensitive organs in the maxillofacial and neck area. The results showed that the effective dose measured by using CDTI phantom and DAP was approached to the outcome of TLD. CTDI100 measurements: (43.51- 188.05 µSv ), DAP value: (55.06- 195.8µSv), TLD measurements: (68.3- 218.28µSv) . The results reinforce need for constant review of protocols and rational use of new technologies.
Phanzu, Bwanga. "Effective dose of radiation on the eye, thyroid and pelvic region resulting from exposures to the Galileos comfort cone beam computerized tomographic scanner." Thesis, 2015. http://hdl.handle.net/10539/17496.
Повний текст джерелаIntroduction: Dental Cone beam CT has encountered great success in diagnostics and treatment planning in dentistry. However, it makes use of ionizing radiation. Lots of concern on the effects of x-rays on vital organs of the head and neck region has been raised. Clarity on the amount of radiation received on these specific organs will be a contribution to a better use of the emergent technology. Aim: The aim of this study is to determine the potential dose of radiation received on the eye and thyroid and to quantify the amount of potential scatter on the gonads during CBCT examinations. Material and Methods: Calibrated Lithium- Fluoride thermoluminescent dosimeters were inserted inside an anthropomorphic phantom, on sites of the eye, thyroid and the gonads. After its submission to a CBCT examination, using the high and standard resolution for a similar scanning protocol, the dose of radiation received on each organ was calculated according to the ICRP guidelines. Results: An equivalent dose of 0.059 mGy was calculated for the eye. Compared to the threshold dose of 0.5 Gy fixed by the ICRP 2007, this can be considered as relatively low. The thyroid with an effective dose of 23.5 μSv represented 20% of the full body effective dose existing in literature. The gonads absorbed an effective dose of 0.05 μSv, which was considered as negligible. Conclusion: The doses calculated were considered as relatively low. However, dentists must be aware of risks of cumulative exposure. Therefore adherence to the ALARA principle and consideration of clinical indication for CBCT remain a priority.
Sung, Chun-Ying, and 宋純潁. "The comparison of effective dose in residul thyroid gland between Cone Beam CT and Spiral CT in SPECT/CT imaging in patients of thyroid cancer with status post I-131 treatment." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/38697595281819531839.
Повний текст джерела高雄醫學大學
醫學影像暨放射科學系碩士在職專班
105
Purpose: Hybrid imaging system becomes widely used in nuclear medicine in recent years. This imaging system offers better functional and anatomical information and thus increases the sensitivity and specifity of examinations. However, patients may have higher radiation exposure of SPECT/CT than those with traditional SPECT , this study evaluates effective dose in residul thyroid gland in patients of thyroid cancer status post I-131 treatment between different types of SPECT/CT and assess secondary cancer risks. Material and methods: In this study, we used TLD-100H to measure the absorbed dose of thyroid. Before the study, we calibrate the TLDs with Elekta Axesse linac and acquired the calibration curve. Single absorbed dose under CT exposure were acquired by placing TLDs on thyroid surface of the RT Humanoid phantom to simulate the protocol of examination with SPECT/CBCT and SPECT/spiral CT respectively. To assess internal dose, 40 patients of differentiated thyroid carcinoma receiving I-131 treatment were selected. Half received the examination by the SPECT/CBCT of Bright view XCT Imaging system (Philips Healthcare, Cleveland, OH) while the other by the SPECT/spiral CT of Discovery NM/CT 670 system(GE Health, USA). The TLDs were placed in the surface of patient''s thyroid gland and measured for 30 minutes. The results (internal dose and effective dose of thyroid) were combined to assess the effective dose and calculate the risk of secondary cancer. Result: The patient who undergoing Bright view XCT SPECT / CBCT scanner, the effective dose of thyroid remnant tissue was 0.56 ± 0.08 mSv, the secondary cancer risk was 1.8 10-6 in the whole population and 5.0 10-7 in the working population. The patient who undergoing Discovery NM/CT 670 SPECT/spiral CT scanner, the effective dose of thyroid remnant tissue was 0.33 ± 0.08 mSv, and the risk of secondary cancer was 1.1 10-6 in the whole population and 3.0 10-7 in the working population. Conclusion: In these two types of SPECT / CT examinations, the effective dose of CT and I-131 given to patients is lower than that of the Atomic Energy Commission in Taiwan, who can only accepted 1 mSv dose limitation for the general population during one year. However, medical exposure is reasonable to diagnosis and treatment patients’ disease and the advantages outweigh the disadvantages, that we can use these tools reasonable.
Chang, Shih-Sheng, and 張仕昇. "Superconductor layer-reduced TMR effectin NiFe/CoFe/AlO/CoFe/Nb." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/80633817999408111596.
Повний текст джерела國立臺灣大學
物理研究所
92
Considering the electron transport in the magnetic tunnel junction, solving the wave function in quantum physics is a tedious work. By means of the transfer matrix, much easier relations correlated the transmission amplitude of the tunneling electron can be derived. In the double barrier tunnel junction, the TMR ratio which calculated with the concept of spin dependent transport varies oscillatorily with the thickness of the middle ferromagnetic layer indicating that the TMR ratio can be modified by adjusting the middle layer thickness. And we correlate the effective spin polarization of the electron with the Fermi wave number in this system. Not only electrical properties but also magnetic structure strongly influence the value of TMR. A superconducting layer is sputtered on the pseudo spin valve magnetic tunnel junction to analyze the influence of superconducting ordering on the magnetization of the FM layer. The electrical transport in superconductor is dominated by cooper pair possessing two electrons of opposite spin. In the experiment different thickness and shape of magnetic and superconducting layers are designed for investigating how they interact with each other. By monitoring the resistance of junction and superconducting layer, apparent decrease of TMR ratio with 500nm thick superconducting layer is observed in spite of 2nm or 30nm thick of the top ferromagnetic layer. Pair breaking effect is observed in the experiment by changing the magnetization orientation of the two ferromagnetic layers. When the applied magnetic field is large, the superconducting state is more unstable which results in the increase of Nb resistance than that the applied field is zero.
De, Beer Morris. "Aspects of the design and behaviour of road structures incorporating lightly cementitious layers." Thesis, 1990. http://hdl.handle.net/2263/26753.
Повний текст джерела