Tesis sobre el tema "Purity"
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Mynott, Edward. "Purity, prostitution and politics : social purity in Manchester : 1880-1900". Thesis, University of Manchester, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.691258.
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Snider, Gordon L. "Cleansing in Psalm 51 cultic or ethical? /". Theological Research Exchange Network (TREN), 1995. http://www.tren.com.
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Berthold, Dana M. "A genealogy of purity /". view abstract or download file of text, 2005. http://wwwlib.umi.com/cr/uoregon/fullcit?p3181084.
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Thesis (Ph. D.)--University of Oregon, 2005.Typescript. Includes vita and abstract. Includes bibliographical references (leaves 157-166). Also available for download via the World Wide Web; free to University of Oregon users.
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Depoix, D. J. "Purity : blessing or burden?" Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/53024.
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Thesis (MPhil)--Stellenbosch University, 2002ENGLISH ABSTRACT: During the history of Israel the concept of "purity" had developed as a way in which God's people could honour his holiness and draw nearer to him, as a sanctified nation. By the time of Jesus, in Second Temple Judaism, the purity system had become restrictive. This had been influenced by political and social developments, including an increased desire to withdraw from Hellenistic and other factors which were seen as contaminating the integrity of Judaism. There were diverse perceptions regarding the achievement of the purity of Israel, including militaristic confrontation and expulsion of alien occupation forces, stricter adherence to the Law and, in some cases, total withdrawal from general society (such as at Qumran). It was, however, particularly the Pharisaic imposition of the supplementary oral tradition, supposed to clarify the written Law, which imposed hardship on those who, through illiteracy or inferior social status, were unable to meet all the minute provisions which would ensure ritual purity. The expansion of the Law of Moses by the commentary of the rabbis, which over time became the entrenched oral "tradition of the fathers", was originally intended to promote access to God by clarifying obscure points of the Law, in the pursuit of purity. However, this oral tradition had, in fact, become an instrument of alienation and separation of the ordinary people not only from the Pharisees, who considered themselves as the religious elite, but also from God. The common people, that is, a large section of the population, felt rejected and on the outside of both religious and social acceptance. On the material level they also suffered under a heavy tax burden, from both Temple and State, which aggravated their poverty. It was this situation which Jesus confronted in his mission to change the ideological climate and to reveal the Kingdom of God as being accessible to all who accepted the true Fatherhood of God, in penitence and humility. He denounced the hypocrisy which professed piety but which ignored the plight of those who were suffering. Hark 7 : 1-23 symbolizes the difference between the teaching and practice of Jesus and that of the Pharisees, and provides metaphorically a pattern of Christian engagement which is relevant in the South African situation today. The Christian challenge is to remove those barriers, both ideological and economic, which impede spiritual and material well-being within society. By active engagement, rather than by retreating to the purely ritualistic and individualistic practice of religion, the realization of the Kingdom of Heaven, as inaugurated by Jesus, will be advanced.
AFRIKAANSE OPSOMMING: Gedurende die geskiedenis van Israel het die konsep van reinheid ontwikkel as 'n wyse waarin die die volk van God Sy heiligheid kan eer en tot Hom kan nader, as 'n geheiligde volk. Teen die tyd van Jesus, tydens Tweede Tempel Judaïsme, het die reinheid sisteem beperkend geword. Dit is beïnvloed deur politieke en sosiale ontwikkelinge, insluitende 'n toenemende drang om te onttrek van Hellenistiese en ander faktore, wat beskou is as 'n besoedeling van die integriteit van Judaïsme. Daar was diverse persepsies aangaande die uitvoering van die reinheid van Israel, insluitende militaristiese konfrontasie en die uitwerping van vreemde besettingsmagte, strenger onderhouding van die Wet en in sekere gevalle, totale onttreking van die algemene samelewing (soos by Qumran). Tog was dit in besonder die Fariseërs se oplegging van bykomende mondelinge tradisie, veronderstelom die geskrewe Wet te verhelder, wat ontbering veroorsaak het vir die wat as gevolg van ongeletterdheid of minderwaardige sosiale status nie in staat was om aan elke haarfyn bepaling, wat rituele reinheid sou verseker, te voldoen nie. Die uitbreiding van die wet van Moses deur die kommentaar van die rabbies, wat met verloop van tyd die ingegrawe mondelinge "tradisie van die vaders" geword het, was oorsproklik bedoel om toegang tot God te verseker, deur die verheldering van onduidelike aspekte van die wet, in die nastreef van reinheid. Hierdie mondelinge tradisie het egter 'n instrument van vervreemding geword en skeiding gebring tussen gewone mense en die Fariseers, sowel as die wat hulleself beskou het as die religieuse elite. Dit het egter ook skeiding gebring tussen mense en God. Die gewone mense, dit is die meerderheid van die bevolking, het verwerp gevoel en aan die buitekring van beide religieuse en sosiale aanvaarding. Op materiële vlak het hulle ook gelyonder die juk van swaar belasting, van beide die Tempel en die Staat, wat hulle toestand van armoede vererger het. Dit was hierdie situasie wat Jesus gekonfronteer het in sy strewe om die ideologiese klimaat te verander en om die Koninkryk van God te openbaar as toeganklik vir almal wat die ware Vaderskap van God aanvaar, in berou en in nederigheid. Hy het die skynheiligheid verwerp wat aanspraak maak op vroomheid, maar die toestand van die lydendes ignoreer. Markus 7:1-23 simboliseer die verskil tussen die onderrig en die praktyk van Jesus en dié van die Fariseërs en voorsien metafories 'n patroon van Christelike verbintenis, wat relevant is binne die eietydse Suid-Afrikaanse konteks. Die uitdaging aan die Christendom is om die skeidslyne te verwyder, beide ideologies en ekonomies, wat geestelike en materieële welsyn binne die gemeenskap belemmer. Deur aktiewe betrokkenheid, eerder as om bloot te onttrek tot die suiwer ritualistiese en individualistiese beoefening van religie, sal die realisering van die Koninkryk van die Hemel soos ingehuldig deur Jesus, bevorder word.
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Khan, Khouler. "Manufacturing high purity chalcogenides". Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/386983/.
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Interest in infrared fibres has grown immensely as niche applications arise as a replacement for silica based optical fibres, whose properties limit its use in the mid infrared. Some of these applications include laser power delivery, chemical sensing and imaging. Of the many infrared transparent materials, the focus of this thesis in particular, will be on high purity chalcogenide glass. While great strides have been made in reducing optical losses of chalcogenides, further improvements are needed in both synthesis and fibre drawing techniques to attain its theoretically predicted potential. In this thesis, glass making techniques including sealed ampoule, levitation, chemical vapour deposition and reactive atmosphere processing techniques are developed and evaluated for producing high purity chalcogenide glass. A state of the art reactive atmosphere processing system with high purity gas delivery of five gasses; argon, hydrogen sulphide, hydrogen, oxygen and chlorine is implemented. The system is automated using National Instrument hardware and Labview software which allows monitoring and data logging in real-time. This bespoke automated system to make chalcogenide has led to reduction in losses to less than 1dB per metre in the 3 to 5 μm region in bulk glass. Experiments and improvements to chemical vapour deposition facilities were done with the goals of scaling the method from thin film deposition to producing high purity bulk glass and fibre. Limits to this process have not been overcome and the challenges remaining are detailed within this thesis. However, new concepts have been developed for implementing a CVD to fibre fabrication process and initial results are presented. The results of this thesis show significant improvement in glass synthesis facilities at the Optoelectronics Research Centre, greatly facilitating production of next generation ultra-low loss chalcogenide glass and fibre.
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Lim, Paul Chang-Ha. "In pursuit of unity, purity, and liberty : Richard Baxter's Puritan ecclesiology in context". Thesis, University of Cambridge, 2001. https://www.repository.cam.ac.uk/handle/1810/272318.
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Cao, Xiangzhi. "Electrorefining of high purity manganese". Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/59447.
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Manganese is an important industrial metal used as an additive for production of various steels, non-ferrous alloys, electronic components and special chemicals. The traditional electrowinning process is not suitable for the production of high-purity manganese. Therefore, a novel ion exchange - electrorefining process for production of high-purity manganese is proposed to solve the problems. The ammonium chloride – manganese chloride electrolyte was selected as the most promising for refining. The physical properties of the electrolyte were first studied. The density increases when increasing concentrations of the ammonium chloride and manganese chloride. The maximum electrical conductivity is obtained with high concentrations of ammonium chloride and high temperature. Viscosity is minimized by high temperature and by low concentrations of manganese chloride. The electrorefining process introduces impurities into the anolyte from the dissolving anode. The purification of the electrolyte by cementation and ion exchange were investigated. This thesis reports the uptake of copper, nickel, cobalt, cadmium, zinc and manganese from manganese chloride solution onto the chelating resin Lewatit® MDS TP220 and Purolite S930Plus in batch and column experiments. The results demonstrate the ability for Lewatit® MDS TP220 to remove contaminants to an extent satisfying the quality criteria required for electrorefining. However, cementation of impurities by manganese powder and ion exchange with Purolite S930Plus are not suitable for purification to satisfy the quality criteria. In the electrorefining process, the individual and synergistic effects of selected impurities on manganese deposit quality were first investigated. The purity of manganese deposit did not change significantly in the presence of impurities. An addition of 0.15–5.0 mg/l Zn²⁺ to the catholyte increases the cathodic current efficiency. The parameters of current density, deposition time, and cathode usage frequency were investigated. Current density, deposition time and cathode usage frequency could affect current efficiency, specific energy consumption and surface morphology. With increasing the current density, the cathodic current efficiency first increased, reached a maximum value and then decreased. With increasing deposition time from 24 hours to 48 hours, the manganese current efficiency decreased and the deposit became more dendritic. The more times the cathode was used, the lower the current efficiency.Applied Science, Faculty of
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Guo, Xiuzhan. "Monadicity, purity and descent equivalence /". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ59136.pdf.
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Menner, Robert James. "Purity a Middle English poem". Ann Arbor, Mich. : University of Michigan Library, 2006. http://quod.lib.umich.edu/cgi/t/text/text-idx?c=cme;cc=cme;view=toc;idno=ACS0188.0001.001.
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Gambrel, Timothy Wayne. "Batch crystallization and crystal purity". Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/11831.
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Wilson, E. Jan. "Holiness and purity in Mesopotamia /". Kevelaer : Neukirchen-Vluyn : Butzon & Bercker ; Neukirchener Verlag, 1994. http://catalogue.bnf.fr/ark:/12148/cb35732069b.
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Melker, Österberg. "Measuring Functional Purity In C# : Developing and implementing a technique for measuring functional purity in C#". Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-454065.
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Functional purity is a fundamental part of the functional programming paradigm. A function is functionally pure if it is side-effect free and deterministic. Pure functions provide many benefits compared to impure ones, including guaranteed thread-safety as well as easier testing, debugging and maintenance. But how can functional purity be measured? This thesis develops a method for statically measuring the level of functional purity in any given C# program. It also investigates problems with determining purity in object-oriented languages, with a focus on C#. Moreover, a prototype of the method is implemented in order to evaluate the method using a benchmark consisting of 11 open source repositories that use C#'s [Pure] attribute. The [Pure] attribute can be placed in front of a method declaration to indicate that it is side-effect free. Due to a number of limitations to the implementation as well as to [Pure]'s definition of functional purity, which excludes determinism, the results of the evaluation appear relatively poor. After normalizing the implementation's classification distribution for each repository, its classification of pure functions has a precision of 65% and recall 17%, and its classification of impure functions has 54% precision and 69% recall. Nevertheless, the prototype still shows the potential of the full analysis method. A complete implementation of the analysis method could potentially yield a fully working system for measuring any C# program's level of functional purity.
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Xu, HaiYing. "Dynamic purity analysis for Java programs". Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=18481.
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The pure methods in a program are those that exhibit functional or side effect free behaviour, a useful property of methods or code in the context of program optimization as well as program understanding. However, gathering purity data is not a trivial task, and existing purity investigations present primarily static results based on a compile-time analysis of program code. We perform a detailed examination of dynamic method purity in Java programs using a Java Virtual Machine (JVM) based analysis. We evaluate multiple purity definitions that range from strong to weak, consider purity forms specific to dynamic execution, and accommodate constraints imposed by an example consumer application of purity data, memoization. We show that while dynamic method purity is actually fairly consistent between programs, examining pure invocation counts and the percentage of the bytecode instruction stream contained within some pure method reveals great variation. We also show that while weakening purity definitions exposes considerable dynamic purity, consumer requirements can limit the actual utility of this information. A good understanding of which methods are "pure" and in what sense is an important contribution to understanding when, how, and what optimizations or properties a program may exhibit.Les fonctions purs dans un programme sont ceux qui démontre un comportement sans fonctionnalité ou effet secondaire. Ceci s'avère une propriété utile pour une fonction ou du code dans le contexte d'optimisation et de compréhension du programme. Cependant, récolter de l'information de pureté n'est pas une tâche facile, et les techniques existantes pour les analyses de pureté ne fournissent que des résultats statiques basés sur une analyses de la compilation du programme. Nous avons exécuter une analyse détaillée de la pureté dynamique des fonctions dans des applications Java en utilisant une approche basés sur un Java Virtual Machine (JVM). Nous avons évalué multiples définitions de pureté, forte et faible, et considéré les formats de pureté spécifiques à l'exécution, tout en considérant les contraintes qui nous sont imposées par un application "consommateur" d'information de pureté et de mémorisation. Nous démontrons que malgré la consistance de la pureté dynamique des fonctions parmi certains applications, l'examen du nombre d'invocation pure et le pourcentage de chaîne d'instruction "bytecode" trouvé dans les fonctions purs nous dévoile l'existante de grande variation. Nous montrons aussi que malgré l'affaiblissement de la définition de la pureté expose considérablement la pureté dynamique, les pré-requis des consommateurs peuvent actuellement limiter l'utilité de cet information. Une bonne compréhension de ce qu'est une fonction "pure" et dans quel sens, est une important contribution à comprendre quand, où, et quelles optimisations ou propriétés une application peut dévoilée.
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Dalzell, Timothy Wayne. "The Anabaptist Purity of Life Ethic". Thesis, North Texas State University, 1985. https://digital.library.unt.edu/ark:/67531/metadc331869/.
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This dissertation establishes that the Evangelical Anabaptists lived a noticeably distinctive Christian life when compared with their peers, accounts for their committed pursuit of holiness, and describes the outcome of that commitment. The sources used include the arranged archival source material in the Tauferakten, confessions, tracts, letters, debates, martyrologies, miscellaneous writings of the Anabaptists, and subsequent scholarship on the subject.
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Evans, Herbert Elgin 1962. "Preparation of high-purity aluminum bicrystals". Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277076.
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The preparation of bicrystal specimens of high interfacial purity and accurately controlled mismatch of orientation between grains with a specific boundary orientation are critical for fundamental studies of the structure and properties of grain boundaries. A method was developed for routinely producing high-purity aluminum bicrystals of desired mismatch and boundary orientation. A strain annealing technique was used for making large single crystals. The orientation, structural perfection, and chemical purity of the seeds were characterized, then the seeds were joined by using an electron beam welder. The welder was designed and built as a major portion of this work.
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Bruce, Ruey K. "Synthesis and Purity Characterization of High Purity 3,3’-Disulfonated-4,4’-Dichlorodiphenyl Sulfone (SDCDPS) Monomer by Ion Chromatography". The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243347553.
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Bruce, Ruey K. "Synthesis and purity characterization of high purtiy 3,3ʹ-disulfonated-4,4ʹ-dichlorodiphenyl sulfone (SDCDPS) monomer by ion chromatography". Columbus, Ohio : Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1243347553.
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Tanguay, Jacques H. "The animal purity laws of Leviticus 11". Theological Research Exchange Network (TREN), 1990. http://www.tren.com.
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Parker, Keith Stuart. "The determination of enantiomeric purity using fluorescence". Thesis, University of Hull, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336286.
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Benson, Carolyn Jane. "Autonomy and purity in Kant's moral theory". Thesis, University of St Andrews, 2010. http://hdl.handle.net/10023/937.
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Kant believed that the moral law is a law that the rational will legislates. This thesis examines this claim and its broader implications for Kant’s moral theory. Many are drawn to Kantian ethics because of its emphasis on the dignity and legislative authority of the rational being. The attractiveness of this emphasis on the special standing and capacities of the self grounds a recent tendency to interpret Kantian autonomy as a doctrine according to which individual agents create binding moral norms. Where this line is taken, however, its advocates face deep questions concerning the compatibility of autonomy and the conception of moral requirement to which Kant is also certainly committed – one which conceives of the moral law as a strictly universal and necessary imperative. This thesis has two main aims. In the first half, I offer an interpretation of Kantian autonomy that both accommodates the universality and necessity of moral constraint and takes seriously the notion that the rational will is a legislator of moral law. As a means of developing and securing my preferred view, I argue that recent popular interpretations of Kantian autonomy fail to resolve the tensions that seem at first glance to plague the concept of self-legislation, where what is at stake is the legislation of a categorical imperative. In the second half of this thesis, I examine the connections between my preferred interpretation of self-legislation and Kant’s dichotomisation of reason and our sensuous nature. I argue that some of the more harsh and seemingly unreasonable aspects of Kant’s moral philosophy can be defended by bringing to light the ways in which they are connected to his commitment both to the autonomy of the will and to developing a genuinely normative ethics.
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Pittard, Christopher Allan. "Purity and genre : late Victorian detective fiction". Thesis, University of Exeter, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.437150.
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Mehta, Gillian Mary Towler. "European Zoroastrianism : attitudes to their purity laws". Thesis, University of Liverpool, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.539542.
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Gehman, Victor H. "Impulse electrical breakdown of high-purity water". Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-06062008-162624/.
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Werrett, Ian C. "Ritual purity and the Dead Sea Scrolls /". Leiden : Brill, 2007. http://catalogue.bnf.fr/ark:/12148/cb411832419.
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Jeffrey, Matthew I. "A Kinetic and electrochemical study of the dissolution of gold in aerated cyanide solutions: the role of solid and solution phase purity". Thesis, Curtin University, 1997. http://hdl.handle.net/20.500.11937/2030.
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Over the last 100 Years, the cyanidation process has been the most popular method for recovering gold from its ores. Despite this, there are still efforts to improve the efficiency of the process, particularly as ores become more difficult to treat. Many investigators have studied the cyanidation process, although a large proportion of these studies have obtained contradictory results. This thesis presents a kinetic and electrochemical study of the leaching of gold in cyanide solutions, and emphasis is placed on rationalising the conflicting results which have been published in the past.The leaching rate of gold was measured using a rotating electrochemical quartz crystal microbalance, an instrument which allows the simultaneous measurement of electrochemical data and mass changes at the solid-solution interface in real time. A proportion of this project was devoted to the on-going design of this instrument, and a number of modifications are discussed in detail. Initially, the leaching of gold in cyanide solutions was investigated under conditions of high purity. Under these conditions, it was found that the gold surface is blocked by a passive film, presumably AuCN. The presence of such a film results in the reaction being chemically controlled, and under typical cyanidation conditions (4 mM cyanide, pH 10.0), the rate of dissolution is very low. These kinetic results were supported by complimentary electrochemical studies, which showed that gold is passive in the potential region where cyanidation occurs.The second part of this thesis presents a study of the effect of system purity on the leaching of gold in cyanide solutions. Solution phase purity was investigated by adding controlled amounts of lead or silver to the leach solutions. It was found that in the presence of low concentrations of lead, the dissolution of gold in 20 mM cyanide solutions was oxygen diffusion controlled (as compared to chemical control for gold in the absence of lead). However, high concentrations of lead were found to be detrimental to the leaching process. It is believed that the role of lead is to modify the surface by cementation, hence reducing the effect of the passive film. Silver was also found to be effective at reducing passivation, and the role of silver believed to be similar to that of lead. It was found that unlike lead, high concentrations of silver are not detrimental to the dissolution of gold in cyanide solutions.Solid phase purity was also found to be important in the leaching of gold, and it was found that the leaching of a gold sample which contains 1 % silver is diffusion controlled. This finding is important from an industrial viewpoint, as most native gold contains some silver. Consequently, attempts were made to rationalise the leaching of gold/silver with current plant practice. Discussion on the effect of cyanide and oxygen concentrations, temperature and lead addition is presented.
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Hanna, Katrina N. "This is who I am: a phenomenological analysis of female purity pledgers' sense of identity and sexual agency". Thesis, Kansas State University, 2016. http://hdl.handle.net/2097/32659.
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Master of ArtsDepartment of Communication Studies
Soo-Hye Han
At the turn of the 21st century, an ideological movement defined by many as the modesty movement helped push sexual abstinence as a controversial yet significant public issue in the United States. Concerned with a "hyper-sexualized" culture, modesty advocates urged young women to make a pledge to remain pure until marriage. Following the the growth of the movement, feminist scholars have been critical of the movement and the potentially detrimental consequences of purity pledges on young women's identity, sexuality, and sexual agency. This study takes a step back from this critical view of purity pledges and listens to young women's lived experience of making a purity pledge and living a life of purity. Specifically, this study asks how purity pledgers understand and enact purity and how they perceive their sexuality and sexual agency. To answer these questions, qualitative interviews were conducted with nine young women who at some point in their life made a purity pledge. A thematic analysis revealed three major themes: 1) living a pure life is situated within multifaceted perspectives on purity, 2) living a life of purity consists of negotiating multiple "selves," and 3) living a life of purity grants and reinforces a sense of agency. A composite description illustrates that religious messages, parents, peers, and sex education classes continue to influence their understanding of purity and sexuality. This project concludes with a discussion of theoretical implications surrounding the idea of a "crystallized self" and practical implications of this study on an organizational, familial, and personal level.
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Ginsz, Michaël. "Characterization of high-purity, multi-segmented germanium detectors". Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAE047/document.
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L’apparition de la segmentation électrique des détecteurs au GeHP et de l’électronique numérique a ouvert la voie à des applications prometteuses, telles que le tracking γ, l’imagerie γ ou la mesure bas bruit de fond, pour lesquelles une connaissance fine de la réponse du détecteur est un atout. L’IPHC a développé une table de scan utilisant un faisceau collimaté, qui sonde la réponse d’un détecteur dans tout son volume en fonction de la localisation de l’interaction. Elle est conçue pour utiliser une technique innovante de scan 3D, le Pulse Shape Comparison Scan, qui a été d’abord simulée afin de démontrer son efficacité. Un détecteur AGATA a été scanné de manière approfondie. Des scan 2D classiques ont permis, entre autres, de mettre en évidence des effets locaux de modification de la collection des charges, liés à la segmentation. Pour la première fois, une base de données 3D, complète, de formes d’impulsions fonction de la position d’interaction a été établie. Elle permettra notamment d’améliorer les performances du spectromètre AGATARecent developments of electrical segmentation of HPGe detectors, coupled with digital electronics have led to promising applications such as γ-ray tracking, γ-ray imaging or low-background measurements which will benefit from a fine knowledge of the detector response. The IPHC has developed a new scanning table which uses a collimated γ-ray beam to investigate the detector response as a function of the location of the γ-ray interaction. It is designed to use the Pulse Shape Comparison Scan technique, which has been simulated in order to prove its efficiency. An AGATA detector has been thoroughly scanned. 2D classical scans brought out, for example, local charge collection modification effects such as charge sharing, due to the segmentation. For the first time, a 3D, complete pulse-shape database has been established. It will especially allow to improve the overall AGATA array performances
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Fankhauser, Roger S. "Sexual purity for non-sexually addicted Christian men". Theological Research Exchange Network (TREN), 2006. http://www.tren.com/search.cfm?p067-0006.
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Givand, Jeffrey. "The effect of relative solubility on crystal purity". Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/10909.
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Campbell, S. "Interplay between entanglement and purity in multipartite systems". Thesis, Queen's University Belfast, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.554354.
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Understanding of how quantum states relate to their environment is vital in order to realize quantum technologies. The class of states possessing the maximum amount of entanglement for a given degree of mixedness is known as maximally entangled mixed states (MEMS). In this Thesis protocols for the generation of these states are studied and their use as teleportation channels is examined. Linking different dimensional systems will prove invaluable to the realization of new quantum technologies. Continuous variable resources are quite favorable for generating entanglement: the transfer of correlations from such resources to discrete systems is studied showing the possibility to engineer the properties of two-qubit states almost at will. Finally this work tackles the crucial problem represented by the detection of entanglement. The larger the entangled state to be detected the more challenging the task becomes. A full characterization of experimentally realizable entanglement witnesses able to discriminate genuinely multipartite entangled states is discussed in detail.
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Gedalof, Irene. "Against purity : identity, western feminisms and Indian complications". Thesis, University of Warwick, 1997. http://wrap.warwick.ac.uk/3851/.
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This thesis argues that Western feminist theoretical models of identity can be productively complicated by the insights of postcolonial feminisms. In particular, it explores ways that Western feminist theory might more adequately sustain a focus on 'women' while keeping open a space for differences such as race and nation. Part One identifies a number of themes that emerge from recent Indian feminist scholarship on the intersections of sex, gender, race, nation and community identities. Part Two uses these insights to look critically at the work of four Western theorists, Rosi Braidotti, Judith Butler, Donna Haraway and Luce Irigaray. I argue that strategies which privilege sexual difference as primary cannot deal adequately with differences such as race and nation. But I also argue that strategies which privilege destabilizing identity can be equally constrained by the logic of dualisms which has made it so difficult for feminists to sustain a focus on women and their differences. Part Three discusses how the insights to be drawn from Indian ferninisms might be taken on board by Western ferninisms in order to develop more complex models of power, identity and the self. Throughout the thesis I draw on a Foucauldian understanding of power as productive, and on Foucault's insight that subjects and identities emerge, not through the imperatives of a single symbolic system, but through the intersection of multiple networks of discourses, material practices and institutions. I argue that, by attending to women's complex location within intersecting landscapes of gender, nation, race and other community identities, feminist models of identity can dispense with a logic of dualisms in order to redefine, and not only destabilize 'women' as the subject of/for feminism. This requires working against purity on three levels. First, it requires a model of power that gives up on the search for pure, power-free zones and works instead with the instabilities power produces as it both enables and constrains women. Second, it requires seeing 'women' as a complex, impure category that bleeds across the apparently coherent borders of identity categories such as gender, race and nation, and contesting discursive constructs of 'Woman' as the pure space of origin upon which these apparently discrete categories stand. Third, it requires the development of alternative models of the self that take these complex, impure spaces as a valid and valorised position from which to act and to speak.
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Goller, Daniel Denis. "Raman studies of high-purity synthetic fused silica". Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615874.
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Mehdi, Akeel Ramadan. "Purity relative to classes of finitely presented modules". Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/purity-relative-to-classes-of-finitely-presented-modules(6ebd54f0-7b74-4f13-abb9-3f3594f93f6a).html.
Texto completoResumen
Any set of finitely presented left modules defines a relative purity for left modules and also apurity for right modules. Purities defined by various classes are compared and investigated,especially in the contexts of modules over semiperfect rings and over tame hereditary, andmore general, finite-dimensional algebras. Connections between the indecomposable relativelypure-injective modules and closure in the full support topology (a refinement of theZiegler spectrum) are described.Duality between left and right modules is used to define the concept of a class of leftmodules and a class of right modules forming an almost dual pair. Definability of suchclasses is investigated, especially in the case that one class is the closure of a set of finitelypresented modules under direct limits. Elementary duality plays an important role here.Given a set of finitely presented modules, the corresponding proper class of relativelypure-exact sequences can be used to define a relative notion of cotorsion pair, which weinvestigate.The results of this thesis unify and extend a wide range of results in the literature.
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Jeffrey, Matthew I. "A Kinetic and electrochemical study of the dissolution of gold in aerated cyanide solutions: the role of solid and solution phase purity". Curtin University of Technology, School of Applied Chemistry, 1997. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=11442.
Texto completoResumen
Over the last 100 Years, the cyanidation process has been the most popular method for recovering gold from its ores. Despite this, there are still efforts to improve the efficiency of the process, particularly as ores become more difficult to treat. Many investigators have studied the cyanidation process, although a large proportion of these studies have obtained contradictory results. This thesis presents a kinetic and electrochemical study of the leaching of gold in cyanide solutions, and emphasis is placed on rationalising the conflicting results which have been published in the past.The leaching rate of gold was measured using a rotating electrochemical quartz crystal microbalance, an instrument which allows the simultaneous measurement of electrochemical data and mass changes at the solid-solution interface in real time. A proportion of this project was devoted to the on-going design of this instrument, and a number of modifications are discussed in detail. Initially, the leaching of gold in cyanide solutions was investigated under conditions of high purity. Under these conditions, it was found that the gold surface is blocked by a passive film, presumably AuCN. The presence of such a film results in the reaction being chemically controlled, and under typical cyanidation conditions (4 mM cyanide, pH 10.0), the rate of dissolution is very low. These kinetic results were supported by complimentary electrochemical studies, which showed that gold is passive in the potential region where cyanidation occurs.The second part of this thesis presents a study of the effect of system purity on the leaching of gold in cyanide solutions. Solution phase purity was investigated by adding controlled amounts of lead or silver to the leach solutions. It was found that in the presence of low concentrations of lead, the dissolution of gold in 20 mM cyanide solutions was oxygen ++diffusion controlled (as compared to chemical control for gold in the absence of lead). However, high concentrations of lead were found to be detrimental to the leaching process. It is believed that the role of lead is to modify the surface by cementation, hence reducing the effect of the passive film. Silver was also found to be effective at reducing passivation, and the role of silver believed to be similar to that of lead. It was found that unlike lead, high concentrations of silver are not detrimental to the dissolution of gold in cyanide solutions.Solid phase purity was also found to be important in the leaching of gold, and it was found that the leaching of a gold sample which contains 1 % silver is diffusion controlled. This finding is important from an industrial viewpoint, as most native gold contains some silver. Consequently, attempts were made to rationalise the leaching of gold/silver with current plant practice. Discussion on the effect of cyanide and oxygen concentrations, temperature and lead addition is presented.
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Dungan, James Alexander. "Investigating the Functional Distinction Between Harm and Purity Norms". Thesis, Boston College, 2017. http://hdl.handle.net/2345/bc-ir:107598.
Texto completoResumen
Thesis advisor: Liane YoungMany debates in moral psychology have revolved around the function of harm norms (e.g., against causing pain to others) and purity norms (e.g., against sexual deviance or consuming taboo foods). Two key pieces of this debate are 1) whether purity norms constitute a separate moral domain than harm norms, each with distinct evolved functions, and 2) if so, whether the function of purity norms is to guard people from disgusting behavior that may signal the threat of disease-causing pathogens. Paper 1 addresses the first point by examining how increasing attention to a violator’s mental states (e.g., whether they acted intentionally or accidentally) changes the way people process harm and purity violations. Using behavioral and neuroimaging techniques, it supports a growing literature demonstrating that judgments of purity violations are influenced less by information about the violator’s intent than judgments of harm violations and suggests distinct functions for harm and purity norms. Paper 2 addresses both points by examining how the relational-context of a violation (e.g., whether an action is directed at oneself or another person) impacts judgments of harm and purity violations. Three studies demonstrate that unlike moral judgments of harm violations, moral judgments of purity violations are more tied to the negative impact a violator has on themselves as opposed to others. Moreover, when a participant was the target of another person’s impure actions, their moral judgments of the action were predicted more by perceptions of harm than purity, suggesting that purity norms do not necessarily track concerns about pathogen exposure. Finally, given the evidence in Papers 1 and 2, Paper 3 tests a novel functional distinction between harm and purity norms whereby harm norms regulate the negative impact people have on each other while purity norms function to define group boundaries by setting expectations about how people conduct themselves. Together, these papers challenge current accounts of the evolutionary origins of harm and purity norms and suggest important new avenues for fully characterizing the function of distinct moral norms
Thesis (PhD) — Boston College, 2017
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Psychology
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Kazen, Thomas. "Jesus and purity Halakhah was Jesus indifferent to impurity? /". Stockholm : Almqvist & Wiksell, 2002. http://catalog.hathitrust.org/api/volumes/oclc/49823804.html.
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Musch, Hans-Eugen. "Robust control of an industrial high-purity distillation column /". [S.l.] : [s.n.], 1994. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=10666.
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Ahmad, Nazwin. "Production of high purity silica from Malaysian silica sand". Thesis, University of Leeds, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.427764.
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Wu, Zecai. "Enantiomeric purity determination using dual polarimetric and absorbance detection". Thesis, University of York, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306467.
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Singerman, David Roth. "Inventing purity in the Atlantic sugar world, 1860-1930". Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/93812.
Texto completoResumen
Thesis: Ph. D. in History, Anthropology, and Science, Technology and Society (HASTS), Massachusetts Institute of Technology, Program in Science, Technology and Society, 2014.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 258-280).
This dissertation illuminates how expert labor makes a complex natural substance into a uniform global commodity. Drawing on both published sources and extensive archival research in the continental United States, in Scotland, and in Puerto Rico, it provides new insight into the workings of the empires of commodities that define modem capitalism. Chapter 1 shows that the notion that sugar has a single valuable molecular essence sucrose- has been used to explain its history as a commodity. Yet this essentialism is not a natural fact but a product of the political economy of the late nineteenth century itself. From the seventeenth century on, sugar production had relied on the experienced multisensory techniques of enslaved craftsmen. But after 1860, newly sophisticated factories began to appear throughout the Caribbean, producing sugar of unprecedented consistency and quality. Chapter 2 explores how the work of chemists was essential to managing labor within these new factories, whose owners attempted to eliminate the need for artisan work. Yet the more successfully chemists extracted sucrose from sugarcane, the more mechanical and obvious they made that extraction appear, and the more they effaced their own necessity. These efforts to use scientific expertise to de-skill sugar production were made possible, Chapter 3 shows, by the persistence of craft and cooperative production in Glasgow, where those factories' machines were built. Sugar engineering firms cultivated relationships with distant plantations, ensuring that draftsmen and engineers could design, maintain, and repair machines that would last many decades. It therefore shows how the devices that facilitated sugar's commodification have human histories themselves. Finally, Chapter 4 reveals how the valuation of sugar became a central political issue in the postbellum United States. The Federal government feared its means of enforcing sugar tariffs was being undermined by fraud on the part of Customs officers and by new forms of sugar itself. But supposedly objective chemical techniques were even harder for the state to supervise. In showing how powerful refiners shaped scientific practices to their own advantage, this chapter provides a new framework for historians' analyses of science, commodities, and corruption in the nineteenth century.
by David Roth Singerman.
Ph. D. in History, Anthropology, and Science, Technology and Society (HASTS)
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Saleh, Khaldoun. "High spectral purity microwave sources based on optical resonators". Toulouse 3, 2012. http://thesesups.ups-tlse.fr/1752/.
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L'optique constitue aujourd'hui une solution performante pour la réalisation de sources très pures en hyperfréquences, en particulier grâce à l'approche de l'oscillateur électro-optique (OEO). La pureté spectrale de ces sources est essentielle pour les applications spatiales, militaires et pour la métrologie du temps et des fréquences. Durant cette thèse, nous avons réalisé et étudié différents types d'OEO à résonateur optique en vue d'optimiser le bruit de phase de ce système. Nous avons en particulier orienté nos travaux vers une approche originale utilisant un anneau résonant fibré (ARF) passif. Ce type de résonateur présente en effet des coefficients de qualité optiques supérieurs à 109 pour des longueurs de fibre restant relativement faibles (L ~ 10 m) et facilement intégrables dans un support planaire. En parallèle, nous avons mené un travail important sur les oscillateurs à base de résonateurs optiques 3D. Concernant l'OEO à ARF, des progrès spectaculaires ont pu être obtenus grâce à une meilleure compréhension des phénomènes de bruit intrinsèques à ce système. Les deux types de bruit prépondérants étaient la conversion du bruit du laser (FM et AM) en bruit de phase RF par différentes non-linéarités (dont la photodiode) et le déclenchement d'effets non-linéaires optiques à l'intérieur du résonateur. Le contrôle de ces effets a permis en particulier d'éliminer des remontées importantes de bruit sur le spectre de l'oscillateur, et d'atteindre un niveau de bruit de phase de -128 dBc/Hz à 10 kHz de la porteuse à 10. 2 GHz en utilisant un OEO à base d'un ARF passif de 100 mètres de longueur, optimisé et immunisé contre les effets non-linéaires optiquesOptics represents an elegant and reliable solution to generate high spectral purity microwave signals, especially the approach using the optoelectronic oscillator (OEO). The spectral purity of these sources is very important for space and military applications and also for time and frequency domain metrology. During this thesis, we have fabricated and studied many types of resonator based OEO in order to optimize the system phase noise. We have especially investigated an original approach using a passive fiber ring resonator (FRR). This resonator type can feature optical quality factors higher than 109 when only few meters of optical fibers are used (L ~ 10 m) and it can be easily integrated in a planar setup. Moreover, we have performed an important work on 3D WGM resonators based oscillators. In the FRR based OEO, spectacular progresses have been achieved thanks to a good understanding of the system intrinsic noise phenomena. Actually, we have found that the most important noise parameters were the laser FM and AM noise conversion into RF phase noise by means of different nonlinearities in the system (like the photodiode nonlinearity), but also by the generation of nonlinear optical effects inside the resonator. By controlling these effects, we have been able to reduce the OEO phase noise level and to reach a -128 dBc/Hz noise level at 10 kHz offset frequency from a 10. 2 GHz carrier. This has been achieved using an OEO based on a 100m-long passive FRR, which has been optimized and immunized against different nonlinear optical effects
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Gianotti, Elia. "High purity hydrogen generation via partial dehydrogenation of fuels". Thesis, Montpellier 2, 2014. http://www.theses.fr/2014MON20078/document.
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Ces travaux de thèse ont été développés dans un contexte de motivation générale de développement de modes de transport plus électrifiés et plus respectueux de l'environnement, dans le but de réduire considérablement les émissions de gaz à l'effet de serre. Plus particulièrement l'objectif de ce projet de thèse a été d'étudier la faisabilité d'un concept de génération d'hydrogène à bord, par déshydrogénation catalytique partielle (PDh) du carburant, permettent d'obtenir de l'hydrogène pour alimenter une pile à combustibles embarquée en replacement des unités de puissance auxiliaires. Dans un même temps le combustible qui n'est que partiellement déshydrogéné conserve ses propriétés et peut être réinjecté dans le pool de carburant. Cette thèse est divisée en deux grandes parties. Une première partie décrit les travaux de recherche sur la déshydrogénation partielle du kérosène pour la production d'hydrogène à bord d'un avion. Le choix du catalyseur est crucial, il doit permettre de produire de l'hydrogène de haute pureté sans compromettre les propriétés d'origine du kérosène. Des matériaux avancés, composés de métaux imprégnés sur des nouveaux supports ont été développés, caractérisés et évalués en tant que catalyseur dans la réaction de PDh. L'influence de la composition du catalyseur sur son activité, sélectivité et durée de vie ainsi que les mécanismes de désactivation ont été étudiés. Un matériau catalytique optimisé composé d'une phase active de 1% Pt - 1 % Sn (m/m) supporté sur une γ-alumine à porosité contrôlée, a permis une production d'hydrogène de 3500 NL•h-1•kgcat-1, avec une pureté de 97,6% vol. et un temps de vie de 79 h, ce qui correspond à une puissance électrique fournie par une pile à combustible de 3,5 kW.La deuxième partie du manuscrit décrit une étude sur le diesel et l'essence et sur la faisabilité de la génération d'hydrogène par PDh des carburants autres que le kérosène. Les résultats obtenus avec le même matériau sont encourageants et montre une application possible dans des domaines de transports autres que l'aviation. Les résultats les plus significatifs obtenus avec des substituts de gasoil et d'essence sont respectivement des valeurs de productivité d'hydrogène de 3500 et 1800 NL•h-1•kgcat-1 avec des temps de vie de 29 et 376 h et une pureté supérieur à 99 % vol. pour le deuxThis thesis work have been developed in the general context of the development of more electrified and environmentally friendly means of transport, in order to significantly reduce greenhouse gases emissions. More specifically, the objective of this thesis project was to study the feasibility of the concept of on-board hydrogen generation by catalytic partial dehydrogenation (PDh) of fuel. The hydrogen produced serves to power a fuel cell system that replaces vehicles auxiliary power units. At the same time the fuel, that is only partially dehydrogenated, maintains its properties and can be re-injected into the fuel pool.This thesis is divided into two main parts. The first part describes the research on the PDh of kerosene to produce hydrogen on-board an aircraft. The choice of the catalyst is crucial: it should allow to produce high purity hydrogen without compromising the original properties of kerosene. Advanced materials, composed by metals impregnated on different supports, have been developed, characterized and evaluated as a catalysts in the reaction of PDh. The influence of catalyst composition on the activity, selectivity and stability as well as the deactivation mechanisms were studied. One of the optimized catalytic materials, composed of a 1% Pt - Sn 1% (w/w) active phase supported on a γ-alumina with controlled porosity, allowed a hydrogen production of 3500 NL•h-1•kgcat-1, with a purity of 97.6% vol. and a lifetime of 79 h, which corresponds to 3.5 kW of electric power supplied by fuel cells.The second part of the manuscript describes a study on diesel and gasoline and asses the feasibility of hydrogen generation by PDh of fuels different from kerosene. The results obtained with the previously mentioned catalyst are encouraging and show the possibility of applying this concept to other fields of transportation beside the aviation. The most significant results obtained with gasoline and diesel surrogates are respectively a hydrogen productivity value of 3500 et 1800 NL•h-1•kgcat-1 with lifetimes of 29 and 376 h and a purity that exceeds 99% vol. in both cases
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Yoshiya, Masato. "Intergranular Glassy Film in High-Purity Si_3N_4-SiO_2 Ceramics". Kyoto University, 2000. http://hdl.handle.net/2433/180926.
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NEGRI, JACOPO RUBENS. "Innovative high spectral purity DPSS lasers for LIDAR systems". Doctoral thesis, Università degli studi di Pavia, 2021. http://hdl.handle.net/11571/1436357.
Texto completoResumen
An innovative oscillator for solid-state laser technology is developed for Single-Longitudinal-Mode (SLM) operation, enabling narrow bandwidth, low pulse-to-pulse time jitter, laser
emission at 1064 nm. The system realized is fully characterized in terms of power, energy, spatial, temporal and spectral performance. The technology developed is defined Self Injection Seeding Ring Oscillator (SISRO), which enables to generate close to transform limited pulses with remarkable reliability and unparalleled simplicity. Both Coherent Doppler LIDARs
(CDL) and High Spectral Resolution LIDARs (HSRL) can benefit from this technology, in terms of cost-efficiency, reliability and complexity. An additional significant advantage
introduced by the SISRO laser architecture is modularity. This property allows to tailor the technology to the desired application and LIDAR system. Both CDL and HSRL
are thus presented, after the fundamental principles governing standard LIDAR techniques have been introduced. CDL is intended to measure the motion of winds whereas HSRL is
employed for discrimination between molecules and particulate matter. In both applications, the systems share the need of a laser source able to generate narrow bandwidth pulses in
order to discriminate spectral broadening induced into the backscattered radiation. The SISRO technique exploits a unidirectional ring architecture to suppress Spatial Hole
Burning (SHB), which is the main antagonist to SLM operation. Unidirectional propagation and thus SLM operation is achieved by means of self-seeding. The SISRO technique emerges
as an appealing candidate for Master Oscillator Power Amplifier (MOPA) architectures, because of the good spatial, spectral, temporal properties and the significant pulse energies
involved (uJ order), which can be easily scaled depending on the application. It is also discussed nonlinear techniques to extend the wavelength operation. Indeed, conventional laser
systems struggle to access specific wavelengths, which are required for both physical reasons and health considerations, such as laser safety. Nonlinear devices enable to shift conventional
high energies laser to exotic wavelengths. In this elaborate is presented nonlinear parametric oscillators for wavelength extension from 1 um to the Short-Wavelength InfraRed (SWIR)
region (1.8-2.5 um). Each part is independently addressed in different chapters of this work. First, it is introduced the LIDAR technology and optical requirements. Then, the optical theory necessary to develop the SISRO, such as Passive Q-Switching and SLM operation, is described. Subsequently, the novel SISRO laser and the several iterations of the architecture based on Neodymium active materials are presented. The key parameters governing the SISRO performance and especially stability are also investigated in details, while the reader is also made
aware of the typical trends associated with comparable technologies. Experimental results and theoretical predictions are thoroughly discussed, in order to understand the advantages
offered by the SISRO technique and to devise suggestions to overcome its major limitations. The nonlinear theory for wavelength extension is thereafter introduced. Both Optical
Parametric Ocillators (OPO) and Backward-Wave Optical Parametric Oscillators (BWOPO) systems are described, in combination with an Optical Parametric Amplifier (OPA) aimed at
the extension of the spectral coverage offered by traditional bulk devices. In these regards, particular attention is dedicated to the spectral performance, showing the trade-off between
these two oscillators technologies.An innovative oscillator for solid-state laser technology is developed for Single-Longitudinal-Mode (SLM) operation, enabling narrow bandwidth, low pulse-to-pulse time jitter, laser emission at 1064 nm. The system realized is fully characterized in terms of power, energy, spatial, temporal and spectral performance. The technology developed is defined Self Injection Seeding Ring Oscillator (SISRO), which enables to generate close to transform limited pulses with remarkable reliability and unparalleled simplicity. Both Coherent Doppler LIDARs (CDL) and High Spectral Resolution LIDARs (HSRL) can benefit from this technology, in terms of cost-efficiency, reliability and complexity. An additional significant advantage introduced by the SISRO laser architecture is modularity. This property allows to tailor the technology to the desired application and LIDAR system. Both CDL and HSRL are thus presented, after the fundamental principles governing standard LIDAR techniques have been introduced. CDL is intended to measure the motion of winds whereas HSRL is employed for discrimination between molecules and particulate matter. In both applications, the systems share the need of a laser source able to generate narrow bandwidth pulses in order to discriminate spectral broadening induced into the backscattered radiation. The SISRO technique exploits a unidirectional ring architecture to suppress Spatial Hole Burning (SHB), which is the main antagonist to SLM operation. Unidirectional propagation and thus SLM operation is achieved by means of self-seeding. The SISRO technique emerges as an appealing candidate for Master Oscillator Power Amplifier (MOPA) architectures, because of the good spatial, spectral, temporal properties and the significant pulse energies involved (uJ order), which can be easily scaled depending on the application. It is also discussed nonlinear techniques to extend the wavelength operation. Indeed, conventional laser systems struggle to access specific wavelengths, which are required for both physical reasons and health considerations, such as laser safety. Nonlinear devices enable to shift conventional high energies laser to exotic wavelengths. In this elaborate is presented nonlinear parametric oscillators for wavelength extension from 1 um to the Short-Wavelength InfraRed (SWIR) region (1.8-2.5 um). Each part is independently addressed in different chapters of this work. First, it is introduced the LIDAR technology and optical requirements. Then, the optical theory necessary to develop the SISRO, such as Passive Q-Switching and SLM operation, is described. Subsequently, the novel SISRO laser and the several iterations of the architecture based on Neodymium active materials are presented. The key parameters governing the SISRO performance and especially stability are also investigated in details, while the reader is also made aware of the typical trends associated with comparable technologies. Experimental results and theoretical predictions are thoroughly discussed, in order to understand the advantages offered by the SISRO technique and to devise suggestions to overcome its major limitations. The nonlinear theory for wavelength extension is thereafter introduced. Both Optical Parametric Ocillators (OPO) and Backward-Wave Optical Parametric Oscillators (BWOPO) systems are described, in combination with an Optical Parametric Amplifier (OPA) aimed at the extension of the spectral coverage offered by traditional bulk devices. In these regards, particular attention is dedicated to the spectral performance, showing the trade-off between these two oscillators technologies.
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Christiansen, Sigrid Aurora. "Visionary or reactionary? : social purity in South Australia, 1881-1885 /". Title page, table of contents and introduction only, 2004. http://web4.library.adelaide.edu.au/theses/09AR/09arc5554.pdf.
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Naguib, Shuruq Abdul Qader. "The meaning of purity in classical exegesis of the Qur'an". Thesis, University of Manchester, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.496382.
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Balakier, K. "High-purity tuneable photonic-integrated millimetre-wave and terahertz sources". Thesis, University College London (University of London), 2016. http://discovery.ucl.ac.uk/1476759/.
Texto completoResumen
This research work focuses on the design and characterisation of indium phosphide photonic integrated circuits for continuous-wave, high-purity millimetre-wave (mm-wave) and terahertz (THz) signal generation. Each source investigated in this work is based on a photonic oscillator (PO) consisting of monolithically integrated semiconductor lasers, and a broad bandwidth photodiode to convert the heterodyne signal from the optical to the electrical domain. The resulting photocurrent contains a component at the desired mm-wave or THz frequency corresponding to the frequency difference between the two lasers. In this thesis, the specifics of three POs are discussed, and dedicated laser phase-locking solutions are investigated and implemented, resulting in a high-purity mm-wave photonic synthesiser being realised and a novel THz PO being proposed and constructed. The former is a compact mm-wave photonic synthesiser consisting of two lasers monolithically integrated with fast photodiodes. High-quality, low-phase-noise signal above 100 GHz is demonstrated through optical injection locking, allowing the synthesised signal to be finely tuned across a 30 GHz span. Furthermore, the phase stabilisation scheme based on optical phase lock loop (OPLL) was constructed and discussed. The latter is a broadly tuneable THz signal generator based on a photonic integrated circuit developed using a generic fabrication foundry approach. The implementation of the photonic chip with twin OPLL enables the two optical lines to combine at the output and create a high-purity, continuously tuneable optical heterodyne signal, which can be data modulated. Furthermore, OPLL operation principles are investigated, leading to the establishment of design guidelines and a definition of the trade-offs present in OPLLs. The integrated POs discussed in this work could be an answer to the need for tuneable, portable, cost- and energy-efficient THz sources that can operate at room temperature. Photonic-enabled emitters have the potential to overcome the limitations of conventional emitters, thereby accelerating the development of coherent THz technology and its applications in spectroscopy, sensing, security and short-range broadband wireless communications.
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Park, Chanyung James. "Immigration Rhetoric and the use of the Cultural Purity Argument". University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1227301852.
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Salunke, Pravahan Shamkant. "High Purity Magnesium Coatings and Single Crystals for Biomedical Applications". University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin150488269765649.
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Li, Chao Rui. "Synthesis of carbon-free Bi2223 superconductor of high phase purity". HKBU Institutional Repository, 1998. http://repository.hkbu.edu.hk/etd_ra/135.
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