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1
Andreas, Björn. "N=1 heterotic, F-theory duality". [S.l. : s.n.], 1998. http://deposit.ddb.de/cgi-bin/dokserv?idn=955480159.
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Andreas, Björn. "N=1 Heterotic / F-Theory Duality". Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 1998. http://dx.doi.org/10.18452/14368.
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In dieser Arbeit werden Aspekte der N = 1 Dualität zwischen dem Heterotischen String (der auf einer komplex dreidimensionalen Calabi-Yau Mannigfaltigkeit mit einem Vektorbündel kompaktifiziert wird) und der F-Theorie (die auf einer komplex vierdimensionalen Calabi-Yau Mannigfaltigkeit kompaktifiziert wird) diskutiert. Zu Beginn wird eine allgemeine Beschreibung der Stringdualitäten gegeben. Die Berech- nungen der notwendigen Calabi-Yau Mannigfaltigkeiten- und Vektorbündeldaten, welche Charakteristische Klassen und Bündelmoduli involvieren, werden im Detail durchgeführt. Die acht- bzw. sechsdimensionale Dualität zwischen dem Heterotis- chen String und der F-Theorie wird diskutiert. Im Anschluß erfolgt ein Vergleich der vierdimensionalen Spektren (dies involviert den Vergleich von N = 1 chiralen Multipletts) und ein Vergleich der Anomaliebedingungen (welche zu konsistenten vierdimensionalen Het/F-Theorie Kompaktifizierungen führen). Weiterhin werden vierdimensionale N = 1 Het/F-Theorie Beispiele konstruiert, insbesondere wird eine Klasse von elliptisch gefaserten Calabi-Yau's über del Pezzoflächen betrachtet.We discuss aspects of N = 1 duality between the heterotic string compactified on a Calabi-Yau threefold with a vector bundle and F-theory on a Calabi-Yau fourfold. After a description of string duality intended for the non-specialist the framework and the constraints for heterotic/F-theory compactifications are presented. The computations of the necessary Calabi-Yau manifold and vector bundle data, involving characteristic classes and bundle moduli, are given in detail. The eight- and six- dimensional dualities are reviewed. The matching of the spectrum of chiral multiplets and of the number of heterotic five-branes respectively F-theory three-branes, needed for anomaly cancellation in four-dimensional vacua, is pointed out. Several examples of four-dimensional dual pairs are constructed where on both sides the geometry of the involved manifolds relies on del Pezzo surfaces.
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Cuquerella, Madoz Inmaculada. "La superación del nihilismo en la obra de Albert Camús". Doctoral thesis, Universitat de València, 2006. http://hdl.handle.net/10803/9861.
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Albert Camus, autor cuya biografía no sólo intelectual sino también vital va a ocupar este trabajo, se caracteriza por no haber formado parte de ningún partido político de forma duradera, sin renunciar por ello al militantismo social y político. Se caracteriza igualmente por haber mantenido una actitud dialogante con los cristianos, aún declarándose él mismo agnóstico. En lo intelectual, se considera a sí mismo a-sistemático y desconfiazado respecto de la razón, sin dar por ello la espalda a la reflexión sobre el bien ético. Por último, en lo estrictamente filosófico, sostiene su divergencia respecto de la corriente existencialista sartriana con quien únicamente reconoce una coincidencia en los temas. Todo ello nos lleva a mantener que Camus puede entenderse como una figura atípica en el contexto histórico de la primera mitad del siglo XX: defendió con pasión, en los distintos ámbitos que ocupan la vida de un hombre, la posibilidad de mantener la identidad propia, y ello en un momento en que las ideologías de todo sesgo "troquelaban" a los individuos y desechaban las "piezas defectuosas". Durante muchos lustros Camus ha sido tenido por una de esas piezas, hoy se le empieza a hacer justicia y se le reconocen abiertamente coraje humano, político e intelectual.El presente trabajo obedece a un doble propósito: pretende ser una clarificación histórica del contenido de la obra de Albert Camus en su conjunto, atendiendo no sólo a su producción ensayística, sino también periodística, literaria y teatral; consiste igualmente en establecer el planteamiento propiamente filosófico del autor, determinando sus componentes ético, político, estético y metafísico.El estudio histórico quiere demostrar que el substrato metafísico sobre el que se asientan las ideas de Camus surge de la crítica nietzscheana al nihilismo; pretende también establecer que el pensador francés no es un pensador existencialista y que la corriente de pensamiento en la que se le debe enmarcar es la de las filosofías de la vida, tal y como se han presentado en la obra de Nietzsche, Bergson y Ortega y Gasset.El análisis filosófico se propone, prolongando el anterior, establecer los presupuestos conceptuales y el alcance del planteamiento vitalista de Camus: ¿Cómo actuar cuando no se cree ni en Dios, ni en la Razón? Si la Razón clásica, abstractiva, traiciona la individualidad, ¿qué modelo de comprensión filosófica puede adoptar el hombre? Los conceptos estudiados de « nihilismo », « absurdo » y « rebeldía » sustentan este nuevo modelo ético-estético de corte hermenéutico: el ser humano es comprensible según la categoría aristotélica de verosimilitud y por ello Camus defiende una « filosofía literaria » donde quede superada la tradicional oposición entre poética y filosofía.The present work serves a double purpose: it aims to be a historical clarification of the content of Albert Camus's works as a whole, not only regarding his essays, but also his journalistic, literary and dramatic works. It also consists in establishing the author's strictly philosophical conception, considering its ethical, political, aesthetic and metaphysical elements.The historical study intends to demonstrate that the metaphysical substratum on which Camus's ideas are based emerges from Nietzsche's criticism of nihilism. It also wants to prove that this thinker is not existentialist. At last, this analysis seeks to demonstrate that Camus should be included in the philosophical current of philosophy of life, with Nietzsche, Bergson and Ortega y Gasset.As an extension of the previous analysis, the philosophical one aims to establish the conceptual presuppositions and the significance of Camus's vitalistic doctrine. How to act when one believes neither in God nor in Reason? If classic Reason, as an abstractive one, betrays individuality, what philosophical comprehension could human beings adopt? "Nihilism", "the absurd", "revolt" are the concepts studied which support this new ethical and aesthetic model, with a hermeneutic dimension. The human being is comprehensible according the Aristotle's category of verisimilitude; therefore Camus defends a "literary philosophy" that could overcome the traditional opposition between poetry and philosophy.
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Lozano, Rodríguez José. "Bases psicológicas y diseño curricular para el grado elemental de música". Doctoral thesis, Universitat de València, 2007. http://hdl.handle.net/10803/10229.
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Esta tesis doctoral es el resultado de las investigaciones llevadas a cabo durante varios años con la intención de mejorar el proceso de enseñanza/aprendizaje del grado elemental de música, dentro de las enseñanzas artísticas, en la especialidad de clarinete. Para ello, se ha elaborado expresamente un diseño curricular adecuado para la enseñanza y el aprendizaje del clarinete en ese grado enfocándolo desde una perspectiva psicológica. Este diseño curricular consta de dos materiales didácticos para cada uno de los cuatro cursos que componen el grado elemental de música en esta especialidad instrumental: un libro del alumno y una guía didáctica para el profesor. Siendo en total ocho materiales didácticos: cuatro libros del alumno y cuatro guías didácticas para el profesor. Cada libro del alumno va acompañado de un disco compacto y cada guía didáctica para el profesor va acompañada de un paquete de treinta y seis fichas rítmicas, un paquete de treinta y seis fichas melódicas y un paquete de dieciocho rompecabezas musicales.En los Anexos I y II de esta tesis doctoral, se incluyen íntegramente los materiales didácticos correspondientes al primer curso ya que fueron los que se emplearon en la investigación. En los Anexos III al VIII, ambos inclusive, por razones de espacio, solamente se incluyen los índices de los materiales didácticos de los otros tres cursos.Para comprobar la eficacia de este diseño curricular para el primer curso de clarinete del grado elemental de música con respecto a los diseños curriculares tradicionales, se llevó a cabo una investigación. En la investigación, se comparó el aprendizaje del clarinete en el primer curso del grado elemental de música en conservatorios elementales y profesionales de España entre dos grupos de alumnos, el grupo control y el grupo experimental, durante un curso escolar completo. En esta investigación se aplicó un programa de intervención en el grupo experimental. En este grupo se utilizaron los materiales didácticos del diseño curricular elaborado correspondientes al primer curso de clarinete del grado elemental de música. En el grupo control, al que no se le aplicó ningún programa de intervención, se utilizaron los materiales didácticos tradicionales correspondientes también al primer curso del grado elemental de música. En los capítulos 5 y 6 mostraremos los resultados y las conclusiones finales de toda esta investigación.Pensando en una distribución lo más adecuada posible de la tesis, además de la INTRODUCCIÓN y de los capítulos 7 y 8, correspondientes a la BIBLIOGRAFÍA y los ANEXOS, respectivamente, la misma se ha estructurado de la siguiente manera:1. DEFINICIÓN DEL PROBLEMA Y JUSTIFICACIÓN. En este capítulo se ha definido el problema objeto de estudio y se ha justificado.2. MARCO TEÓRICO. En este capítulo se ha establecido un marco teórico con el fin de situar el problema dentro de un conjunto de conocimientos y orientar el trabajo de un modo coherente.3. OBJETIVOS E HIPÓTESIS. En este capítulo se ha planteado el objetivo general que se pretende conseguir, concretado en una serie de objetivos específicos, y se ha formulado la hipótesis de trabajo. 4. METODOLOGÍA DE LA INVESTIGACIÓN. En este capítulo se ha descrito la investigación que se llevó a cabo para conseguir el objetivo general y los objetivos específicos mencionados anteriormente.5. RESULTADOS Y DISCUSIÓN. En este capítulo se han reflejado los resultados de la investigación y la discusión sobre los mismos.6. CONCLUSIONES FINALES Y FUTURAS LÍNEAS DE INVESTIGACIÓN. En este capítulo se han extraído las conclusiones finales de la investigación y se han propuesto líneas de investigación para el futuro.This doctoral thesis is the result of the investigations carried out during several years with the intention of improving the process of teaching/learning of music's elementary grade in the clarinet. With this aim, an appropriate curricular design has been expressly elaborated for teaching and learning the clarinet in that grade focusing it from a psychological perspective. This curricular design consists of two didactic materials for each one of the four years that they compose music's elementary grade in clarinet in Spain: a student's book and a teacher's book. Being in total eight didactic materials: the student's four books and the teacher's four books. Each student's book is accompanied by a compact disc and each teacher's book is accompanied by a package of thirty six rhythmic cards, a package of thirty six melodic cards and a package of eighteen musical puzzles.In Annex I and II of this doctoral thesis, the didactic materials are included entirely corresponding to the first year since they were those which were used in the investigation. In the Annexes III at the VIII, both inclusive, for space reasons, the indexes of the didactic materials of the other three years are only included.To check the effectiveness of this curricular design for the first course of clarinet of music's elementary grade with regard to the traditional curricular designs, an investigation was carried out. In the investigation, the learning of the clarinet was compared between two student groups in the first year of music's elementary grade in elementary and professional conservatories in Spain, the control group and the experimental group, during a complete academic year. In this investigation an intervention program was applied in the experimental group. In this group, the didactic materials of the elaborated curricular design were used. In the control group, to the one that was not applied any intervention program, the traditional didactic materials were used. In the chapters 5 and 6 we show the results and the final conclusions of the whole investigation.
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Nzioki, Anne Marie. "1+1+2 covariant approach to gravitational lensing in f(R) gravity". Master's thesis, University of Cape Town, 2009. http://hdl.handle.net/11427/17116.
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Includes bibliographical references (pages 64-67).In this thesis, we develop the 1 + 1 + 2 formalism, a technique originally devised for General Relativity, to treat spherically symmetric spacetimes in for fourth order theories of gravity. Using this formalism, we derive equations for a static and spherically symmetric spacetime for general f(R) gravity. We apply these master eqautions to derive some exact solutions, which are used to gain insight on Birkhoff's theorem in this framework. Additionally, we derive a covariant form of the lensing angle for a specific spherically symmetric solution in f(R) = Rn gravity.
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Toro, Clemente. "Improved 1/f noise measurements for microwave transistors". [Tampa, Fla.] : University of South Florida, 2004. http://purl.fcla.edu/fcla/etd/SFE0000371.
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Toro, Clemente Jr. "Improved 1/f Noise Measurements for Microwave Transistors". Scholar Commons, 2004. https://scholarcommons.usf.edu/etd/1271.
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Minimizing electrical noise is an increasingly important topic. New systems and modulation techniques require a lower noise threshold. Therefore, the design of RF and microwave systems using low noise devices is a consideration that the circuit design engineer must take into account. Properly measuring noise for a given device is also vital for proper characterization and modeling of device noise. In the case of an oscillator, a vital part of a wireless receiver, the phase noise that it produces affects the overall noise of the system. Factors such as biasing, selectivity of the input and output networks, and selectivity of the active device (e.g. a transistor) affect the phase noise performance of the oscillator. Thus, properly selecting a device that produces low noise is vital to low noise design. In an oscillator, 1/f noise that is present in transistors at low frequencies is upconverted and added to the phase noise around the carrier signal. Hence, proper characterization of 1/f noise and its effects on phase noise is an important topic of research.
This thesis focuses on the design of a microwave transistor 1/f noise (flicker noise) measurement system. Ultra-low noise operational amplifier circuits are constructed and used as part of a system designed to measure 1/f noise over a broad frequency range. The system directly measures the 1/f noise current sources generated by transistors with the use of a transimpedance (current) amplifier. Voltage amplifiers are used to provide the additional gain. The system was designed to provide a wide frequency response in order to determine corner frequencies for various devices. Problems such as biasing filter networks, and load resistances are examined as they have an effect on the measured data; and, solutions to these problems are provided. Proper representation of measured 1/f noise data is also presented. Measured and modeled data are compared in order to validate the accuracy of the measurements. As a result, 1/f noise modeling parameters extracted from the measured 1/f noise data are used to provide improved prediction of oscillator phase noise.
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Gesley, Mark Alan. "Spectral analysis of field emission flicker (1/f) noise". Full text open access at:, 1985. http://content.ohsu.edu/u?/etd,85.
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Haigh, Mary K. "1/f noise in mercury cadmium telluride semiconductor diodes". Thesis, Heriot-Watt University, 2005. http://hdl.handle.net/10399/200.
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Jong, Yeung-dong. "Fiber-optic interferometer for high 1/f noise environments /". Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.
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Gross, Blaine Jeffrey. "1/f noise in MOSFETs with ultrathin gate dielectrics". Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/13192.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1992.Includes bibliographical references (p. 176-184).
by Blaine Jeffrey Gross.
Ph.D.
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Wang, Alexander C. (Alexander Che-Wei). "Multiscale state-space algorithms for processing 1/f signals". Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/42672.
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Tobias, David Andrew. "1/f noise and Luttinger liquid phenomena in carbon nanotubes". College Park, Md. : University of Maryland, 2007. http://hdl.handle.net/1903/7334.
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Thesis (Ph. D.) -- University of Maryland, College Park, 2007.Thesis research directed by: Physics. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Raul, Vishal Vinod. "Analysis of F-duct drag reduction system in Formula 1". Thesis, Wichita State University, 2013. http://hdl.handle.net/10057/10643.
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During the Formula 1 auto racing season of 2010, team McLaren developed an aerodynamic device called an F-Duct. This device was an ingenious way of out-thinking the regulations of the Federation Internationale de l'Automobile (FIA) by providing a means of notably controlling car performance. More specifically, the F-Duct is a device that allows a driver to alter air flow over the car's rear wing in order to gain higher speed on long straight sections of the race track (up to 10 kmph). In general, Formula 1 teams do not share technological details about their cars in order to keep an advantage over other teams. Available public information is vague in nature and does not provide any technical details. This thesis studied the existing F-Duct system and its requirements, including the location of key components and their functions. First, a working concept was proposed, and a simplified model was prepared to test the concept. Wind tunnel testing was performed on a physical model and the data analyzed. Continuous improvements were made to achieve drag reduction through passive flow control. Finally, an improved model was prepared, drag reduction was observed, and wind tunnel data presented.Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Aerospace Engineering
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Siabi-Shahrivar, Nasser. "A study of 1/f noise in polysilicon emitter transistors". Thesis, University of Southampton, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314728.
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Timpe, Jason T. (Jason Thomas) 1977. "Measurement and analysis of 1/f noise in uncooled microbolometers". Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/86827.
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Kuhler, Kent A. (Kent Alan). "Design of a high speed 1/f noise test station". Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43300.
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Varol, Oğuz. "Kriterien für Tor1[alpha] (E, F)=0 [Tor 1 alpha (E, F)=0] für (DF)- und Frécheträume". [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=969223277.
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Imbusch, Ruth. "Phytoprostane F 1 : eine neue Klasse Prostaglandin-ähnlicher Verbindungen in Pflanzen". kostenfrei, 2001. http://nbn-resolving.de/urn/resolver.pl?urn=nbn:de:bvb:20-1182238.
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Chalmers, Kirsten Hardie. "Fluorinated paramagnetic probes for 19-F and 1-H MRS/MRI". Thesis, Durham University, 2011. http://etheses.dur.ac.uk/879/.
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Novel CF3-labelled lanthanide(III) complexes have been synthesised for use as probes for 19-F and 1-H magnetic resonance spectroscopy and imaging. The syntheses and evaluation of two classes of fluorinated paramagnetic complexes are defined. Notably, the 19-F magnetic resonance relaxation processes for the complexes have been assessed, allowing for the analysis of the interplay between applied field, Ln(III) ion and rotational correlation time on relaxation properties. Strategies employed to enhance signal intensity are discussed, examining a number of different of fluorinated mono- and di-amide cyclen ligands. Systems incorporating phosphinate pendant arms are of particular interest, resulting in complexes with favourable isomer distributions, faster longitudinal relaxation rates and narrower linewidths. Finally, the synthesis of high molecular weight conjugates with paramagnetic fluorinated complexes is described. Three different classes of medium to high molecular adducts were considered, with the merits and limitations of each assessed. The desirable formation of one species in solution, ease of solubility and attractive 19F and 1H relaxometric properties render the chitosan conjugates promising candidates for future use as imaging probes.
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Sandquist, Lisa, i Lina Siebing. "Livsviktig läsundervisning i f–1 : Mötet mellan styrdokument, läromedelsförfattare och lärare". Thesis, Linnéuniversitetet, Institutionen för svenska språket (SV), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-85637.
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Syftet med studien är att undersöka vad införandet av obligatorisk förskoleklass innebär för läsundervisningen i årskurs f–1. Studiens teoretiska ram utgår från läroplans- och ramfaktorteorin. Studiens data omfattas av olika regeringsförslag, den nya läroplanens framskrivning gällande förskoleklass och läsning i f–1 följt av åtta semistrukturerade intervjuer med fyra läromedelsförfattare och fyra verksamma f–1 lärare. Insamlade data analyserades utifrån Lindes (2012) tolkning av läroplansteorins tre arenor: formuleringsarenan, transformeringsarenan och realiseringsarenan. De tre arenorna samt ramfaktorer som läroplan, tid och behörighet är centrala i analysen av resultatet. Resultatet visar att införandet av en obligatorisk förskoleklass har potential att bidra till många fördelar gällande den livsviktiga läsundervisningen och den enskilda elevens läsutveckling, då fokus nu kan läggas på läsundervisningens progression och lärare kan fånga upp de svaga eleverna i ett tidigare skede. Studiens resultat visar också att läroplanens framskrivning för förskoleklass kan komma att bidra till en utökad undervisningstid i förskoleklass, eftersom förskoleklassens timplan fortfarande varierar från skola till skola trots det obligatoriska införandet. Det råder dock delade meningar om vad införandet av obligatorisk förskoleklass innebär för läsundervisningen i årskurs f–1 och hur vidare läsundervisningen kommer att förändras eller bedrivas på samma sätt som innan. Slutligen indikerar studiens resultat att det finns vissa oklarheter om vem som ska arbeta i förskoleklass, lärare eller förskollärare, och att det beslutet kan bära med sig konsekvenser för att kunna uppnå en likvärdig skola för alla.
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Wang, Xiawa. "On the 1/f noise of atomic-layer-deposition metal films". Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/77000.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, February 2012."February 2011." Cataloged from PDF version of thesis.
Includes bibliographical references (p. 77-81).
This thesis presents the measurement techniques and results of low-frequency noise for atomic-layer-deposition Pt films. Atomic-layer-deposition has been developed as an approach to make ultra-thin and conformal films. It has been employed to make detectors of bolometers. 1/f noise is a fundamental limit to the resolution. The experiments are designed to characterize the 1/f noise of the ALD fabricated Pt films. The measurement results show that for 7nm and 13nm ALD fabricated Pt films, 1/f noise is about two orders of magnitude larger than reported for continuous Pt films in literature. The thin film is also very likely to suffer from electromigration damage.
by Xiawa Wang.
M.Eng.
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Pleso, Faye Janine. "Oversight and Quality Assurance of Academic Programs Under F-1 Visas". ScholarWorks, 2017. https://scholarworks.waldenu.edu/dissertations/3821.
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An F-1 academic visa is required for foreign students studying at academic institutions in the United States. While requirements for acquiring the F-1 visa are a matter of federal policy, some of the principles regulating orientations, host families, and home-stays do not align with best practices found at the university level, which include quality student orientations and thorough trainings with a vetting process for host families and home-stays. This lack of regulation may place visiting students at risk in terms of personal safety and wellbeing and have negative impacts for program credibility and lost revenue. Using Stone's regime theory as the foundation, the purpose of this multiple case study of orientations and home-stay experiences of F-1 visa students under the Student and Exchange Visitor Program, was to explore from the perspective of program participants, ways to increase safety and quality assurance of these programs. Data were collected through in-depth interviews with six former student participants. These data were inductively coded and subjected to a thematic analysis procedure. A key theme of this study is that participants perceived that additional training to host families including vetting and monitoring processes and student orientations in acculturation and communication would enhance the experiences of F-1 visa holders. The implications for positive social change include recommendations to schools and study abroad organizations to implement policy changes regarding the requirements for students and host families, sponsors, and home-stay monitoring and orientation components for students and host families to promote more effective and safer home-stays for F-1 high school students.
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Inge, Gustav. "Mendelssohn stråkkvartett nr.6 i f-moll Op.80, sats 1". Thesis, Kungl. Musikhögskolan, Institutionen för klassisk musik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kmh:diva-2534.
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Denna uppsats är tänkt att kretsa kring första satsen ur Felix Mendelssohns sjätte stråkkvartett i f-moll som han skrev när hans syster Fanny hastigt och tragiskt gick bort, samt hur detta trauma speglas i musiken. Jag ger en analys av verket samt förklarar hur vi resonerar inom kvartetten för att försöka förmedla den rätta känslan. Då jag spenderat en stor del av mina tre år på KMH till att spela med min kvartett, så vill jag gärna ge en inblick i hur vi arbetar tillsammans.
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Tang, Chun-keung Teddy. "A study of the implementation of the guidelines on civic education through the F.1 - F.5 history curriculum". Click to view the E-thesis via HKUTO, 1985. http://sunzi.lib.hku.hk/HKUTO/record/B38627024.
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Tang, Chun-keung Teddy, i 鄧振強. "A study of the implementation of the guidelines on civic education through the F.1 - F.5 history curriculum". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1985. http://hub.hku.hk/bib/B38627024.
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Braun, Julian F. W. [Verfasser]. "Regulation der Amine Oxidase Copper-containing 1 durch den Wilms-Tumor-Transkriptionsfaktor 1 / Julian F. W. Braun". Berlin : Medizinische Fakultät Charité - Universitätsmedizin Berlin, 2016. http://d-nb.info/1119803047/34.
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Korvemaker, Michelle L. "The distributions of F-actin, alpha-catenin, LFA-1, and PECAM-1 during monocyte diapedesis in situ". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ30765.pdf.
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Koyama, Hiroko, Kenta Kiuchi i Tetsuro Konishi. "1/f fluctuations in spinning-particle motions around a Schwarzschild black hole". American Physical Society, 2007. http://hdl.handle.net/2237/11272.
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Lindman, Beatrice. "Matematikundervisning i förskoleklass : Pedagogiska planeringar i matematik av verksam F-1-lärare". Thesis, Umeå universitet, Institutionen för naturvetenskapernas och matematikens didaktik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-150127.
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Syftet med detta arbete är att öka kunskapen kring hur verksamma lärare i förskoleklass undervisar i matematik och hur denna undervisning bidrar till ”bron” mellan förskola och skola. För att ta reda på detta samlades förskoleklass- och årskurs 1 planeringar in från verksamma lärare i respektive årskurs och dessa analyserades utifrån läroplanen och Lindes fyra kunskapsformer. Studien visade att de deltagande förskoleklasslärare väl förhåller sig till del 3 i läroplanen i sina planeringar samt att de har mycket lek, skapande och praktisk undervisning. Detta bidrar till bron mellan förskola och skola då förskolepedagogiken integreras med skolans. Studien visade även att förskoleklassundervisningen bygger mer på det praktiska än årskurs 1. Det framgick även i årskurs 1 planeringarna att det är mer fokus på att lära sig bland annat begrepp och samband än i förskoleklass. Slutsatsen är att förskoleklasslärarna i denna studie bidrar till bron mot skolans värld.
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Llinares, Pierre. "Evolution du bruit 1/f dans les transistors bipolaires des technologies BiCMOS". Montpellier 2, 1998. http://www.theses.fr/1998MON20062.
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Matharoo, Rishi. "1/f Additive Phase Noise Analysis for One-Port Injection Locked Oscillators". The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1430772754.
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Ghosh, Santunu. "Study on the origin of 1/f in bulk acoustic wave resonators". Thesis, Besançon, 2014. http://www.theses.fr/2014BESA2046/document.
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Depuis quelques décennies, la technologie de contrôle de la fréquence a été au coeur de l'électronique des tempsmodernes grâce à son vaste domaine d'applications dans les systèmes de communication, les ordinateurs, les systèmesde navigation ou de défense militaire. Les dispositifs temps-fréquence fournissent des stabilités de fréquence et despuretés spectrales élevées dans le domaine de la stabilité court-terme. L'amélioration de la performance de cesdispositifs reste un grand défi pour les chercheurs. La réduction du bruit afin d'augmenter cette stabilité court-terme etd'éviter les commutations non souhaitées entre les canaux est donc très souhaitable. Il est communément admis que lalimitation fondamentale à cette stabilité court-terme est due au bruit flicker de fréquence des résonateurs. Dans cemanuscrit, un premier chapitre rappelle quelques faits de base sur l’acoustique, la cristallographie et les définitions dudomaine temps-fréquence nécessaires à l’étude des résonateurs et oscillateurs ultra-stables. Le deuxième chapitre estconsacré à un résumé de la littérature sur le bruit de fréquence en 1/f. Ensuite, le troisième chapitre concerne nos étudessur le modèle quantique de bruit en 1/f du Pr. Handel, qui, bien que critiqué par beaucoup, est encore le seul qui fournitune estimation de l'amplitude de plancher de bruit en 1/f et qui n'est pas infirmé par les données expérimentales. Dans lequatrième chapitre, une autre approche, basée sur le théorème de fluctuation-dissipation, est utilisée afin de mettre descontraintes numériques sur un modèle de bruit en 1/f causé par une dissipation interne (ou de structure) proportionnelleà l'amplitude, et non à la vitesse. Le dernier chapitre est consacré aux résultats expérimentaux. Le design et lesparamètres du résonateur ultra-stable utilisé lors de cette étude sont décrits. Les mesures de bruit de phase sur plusieurslots de résonateurs sont données. Les mesures des paramètres de résonateur ont été effectuées à basse température afinde les corréler avec les résultats de bruit. Afin d'évaluer rapidement la qualité des différents résonateurs, une autreapproche dans le domaine temporel a été testée. Elle utilise des oscillations pseudo-périodiques transitoires mettant lesoscilloscopes numériques actuellement disponibles à leurs limites de capacité. Enfin, les conclusions et perspectivessont présentéesSince a few decades, frequency control technology has been at the heart of modern day electronics due to its huge areaof applications in communication systems, computers, navigation systems or military defense. Frequency controldevices provide high frequency stabilities and spectral purities in the short term domain. However, improvement of theperformance of these devices, in terms of frequency stability, remains a big challenge for researchers. Reducing noise inorder to increase the short term stability and avoid unwanted switching between channels is thus very desirable. It iscommonly admitted that the fundamental limitation to this short-term stability is due to flicker frequency noise in theresonators. In this manuscript, a first chapter recalls some basic facts about acoustic, crystallography and definitions oftime and frequency domain needed to explore ultra-stable resonators and oscillators. The second chapter is devoted to asummary of the literature on flicker frequency noise. Then, the third chapter concerns our studies on Handel’s quantum1/f noise model, which although criticized by many, is still the only one that provides an estimation of the flooramplitude of 1/f noise that is not invalidated by experimental data. In the fourth chapter, another approach, based on thefluctuation-dissipation theorem, is used in order to put numerical constraints on a model of 1/f noise caused by aninternal (or structural) dissipation proportional to the amplitude and not to the speed. The last chapter is devoted toexperimental results. An ultra-stable resonator used during this study is described. Phase noise measurements on severalbatches of resonators are given. Measurements of resonator parameters have been done at low temperature in order tocorrelate them with noise results. Another approach with a procedure that use transient pseudo periodic oscillations andput to their limits the capacities of presently available digital oscilloscopes, is presented, in order to assess rapidly thequality of various resonators. Finally, conclusions and perspectives are given
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Bueno, Thays Vieira. "Capacidade combinatória de genitores de soja nas gerações F 1 e F 2 visando melhoramento para precocidade e produtividade de grãos". Universidade Federal de Viçosa, 2017. http://www.locus.ufv.br/handle/123456789/11688.
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Conselho Nacional de Desenvolvimento Científico e Tecnológico
A cultura da soja apresenta grande importância socioeconômica no Brasil e no mundo devido, principalmente, a sua participação na cadeia produtiva animal e na alimentação humana. O melhoramento dessa cultura tem sido uma das principais ferramentas que auxiliam no aumento da produtividade e adaptação da soja em diversas regiões do país. A precocidade e a produtividade são algumas das principais características buscadas no melhoramento de soja. Nos programas de melhoramento, a seleção de genitores e a identificação de cruzamentos superiores são etapas importantes no desenvolvimento de cultivares. Desse modo, a análise dialélica é uma ferramenta importante para essa finalidade, pois permite estimar a capacidade de combinação de genitores. Essa estimativa é usualmente obtida a partir dos dados da geração F 1 , porém, atualmente existem diversos autores que utilizam os dados de gerações avançadas como F 2 por apresentarem maior número de sementes. Diante disso, objetivou-se obter informações sobre a capacidade geral e específica de combinação de genitores utilizando as populações F 1 e F 2 , com vistas à obtenção de populações segregantes de soja que associem precocidade e alto potencial de produção. Foram realizados cruzamentos entre sete cultivares de soja, provenientes de dois grupos, em esquema de dialelo parcial 3x4. O grupo I consistiu em três cultivares que apresentam alto potencial de produção (UFV 18, UFVS 2011 e UFV 16), e o grupo II em quatro cultivares comerciais, com alto potencial de produção e ciclo precoce (FPS Netuno RR, BMX Potência RR, Anta 82 RR e TMG 1174 RR). As 12 populações F 1 e os sete genitores foram semeados em vasos em casa de vegetação na Universidade Federal de Viçosa, em Viçosa, MG. O delineamento experimental utilizado foi o de blocos ao acaso, com cinco repetições. Os tratamentos consistiram de 12 populações F 1 e sete genitores, totalizando 19 tratamentos. A parcela experimental foi constituída por uma planta por vaso. As características avaliadas na geração F 1 foram número de dias para o florescimento, número de dias para a maturidade, altura de planta no florescimento, altura de planta na maturidade, número de vagens por planta, número de grãos por vagem, número de grãos por planta, massa de grãos por planta e massa de cem grãos. As sementes colhidas nas plantas F 1 das 12 populações compuseram as populações F 2 que juntamente com as sementes dos sete genitores foram semeadas na área experimental da Horta Nova, em Viçosa, MG. O delineamento experimental utilizado foi o de blocos ao acaso, com três repetições. As parcelas foram constituídas de quatro linhas de 3 m com espaçamento de 0,50 m e 12 sementes por metro linear. As características avaliadas na geração F 2 foram número de dias para o florescimento e altura de planta no florescimento. As cultivares UFV 16, UFVS 2011, Anta 82 RR se destacaram quanto à redução de ciclo com valores de CGC negativos e significativos para número de dias para o florescimento nas gerações F 1 e F 2 . Na geração F 1 , as cultivares UFVS 2011 e FPS Netuno RR se destacaram na redução de altura de planta no florescimento e na maturidade, com valores negativos e significativos de CGC, e para massa de grãos por planta a cultivar UFV 18 apresentou valor positivo e significativo de CGC. Conclui-se que as cultivares UFVS 2011, UFV 16 e Anta 82 RR são genitores promissores para redução de ciclo da cultura, enquanto que UFV 18 para aumento da produção por planta. A análise dialélica parcial em soja na geração F 2 é eficiente na escolha de genitores de soja promissores para precocidade.
The soybean crop has great socio-economic importance in Brazil and worldwide, mainly due to their participation in animal production chain and in food. The soybean breeding has been one of the main tools that help in increasing the yield and adaptation of the soybean in several regions of the country. Precocity and yield are some of the main characteristics sought in soybean breeding. At the breeding programs, selection of parents and identification of superior crosses are important steps in the development of cultivars. Thus, diallel analysis is an important tool for this purpose, because it allows to estimate the combining ability of parent. This estimate is usually obtained from the data of the F 1 generation, however, there are currently several authors who use data from advanced generations like F 2 because they have a higher number of seeds. On this, the objective was to obtain information about the general and specific capacity of combination of parents using the F 1 and F 2 populations, in order to obtain segregant soybean populations that associate precocity and high production potential. Crosses were made among seven soybean cultivars, from two groups, in a 3x4 partial diallel scheme. Group I consisted of three cultivars with high production potential (UFV 18, UFVS 2011 and UFV 16), and group II of four commercial cultivars with high production potential and early cycle (FPS Netuno RR, BMX Potência RR, Anta 82 RR and TMG 1174 RR). The 12 F 1 populations and the seven parents were sown in pots at a greenhouse at the Federal University of Viçosa, in Viçosa, MG. The experimental design was a randomized block design with five replications. The treatments consisted of 12 F 1 populations and seven parents, totaling 19 treatments. The experimental plot consisted of one plant per pot. The characteristics evaluated in F 1 generation were number of days for flowering, number of days for maturity, plant height at flowering, plant height at maturity, number of pods per plant, number of grains per pod, number of grains per plant, mass of grains per plant and mass of one hundred grains. Seeds collected from the F 1 plants of the 12 populations made up the F 2 populations that together with the seeds of the seven parents were sown in the experimental area of Horta Nova, in Viçosa, MG. The experimental design was a randomized complete block design, with three replications. The plots were composed of four 3 m rows with spacing of 0.50 m and 12 seeds per linear meter. The characteristics evaluated in the F 2 generation were number of days for flowering and plant height at flowering. The cultivars UFV 16, UFVS 2011, Anta 82 RR stood out for cycle reduction with negative GCA values and significant for number of days for flowering in the F 1 and F 2 generations. In the F 1 generation, cultivars UFVS 2011 and FPS Netuno RR stood out in the reduction of plant height at flowering and at maturity, with negative and significant values of GCA, and for grain mass per plant the cultivar UFV 18 showed positive and significant value of GCA. It is concluded that cultivars UFVS 2011, UFV 16 and Anta 82 RR are promising parents in the reduction of crop cycle, while UFV 18 to increase yield per plant. Partial diallel analysis in soybean in the F 2 generation is efficient in the choice of promising soybean parents for precocity.
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Rodda, Lasya. "Baseband Noise Suppression in Ofdm Using Kalman Filter". Thesis, University of North Texas, 2012. https://digital.library.unt.edu/ark:/67531/metadc115147/.
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As the technology is advances the reduced size of hardware gives rise to an additive 1/f baseband noise. This additive 1/f noise is a system noise generated due to miniaturization of hardware and affects the lower frequencies. Though 1/f noise does not show much effect in wide band channels because of its nature to affect only certain frequencies, 1/f noise becomes a prominent in OFDM communication systems where narrow band channels are used. in this thesis, I study the effects of 1/f noise on the OFDM systems and implement algorithms for estimation and suppression of the noise using Kalman filter. Suppression of the noise is achieved by subtracting the estimated noise from the received noise. I show that the performance of the system is considerably improved by applying the 1/f noise suppression.
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François, Arnaud. "MESURES DE BRUIT EN 1/f SUR DES COMPOSITES : POLYANILINE / POLYMETHACRYLATE DE METHYLE". Phd thesis, Université Joseph Fourier (Grenoble), 2003. http://tel.archives-ouvertes.fr/tel-00005342.
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Dans cette étude nous utilisons une méthode expérimentale novatrice, la mesure du bruit en 1/f, pour approfondir la compréhension des mécanismes de transport dans les compo-sites polymères conducteurs : polyaniline (PANI) - polyméthacrylate de méthyle (PMMA). Une description précise du dispositif utilisé pour ces mesures est présentée. L'influence de la forme de l'échantillon, de la position des contacts électriques et de la méthode de mesure (2 ou 4 contacts) sur le niveau de bruit enregistré est discutée. Puis nous montrons que les composites PANI-PMMA présentent un bruit en 1/f dont l'amplitude S_R, en fonction de la concentration et de la résistance R, suit les lois d'échelle de la percolation avec des exposants critiques kappa=2.19 et w=1.15. L'influence des défauts est testée par l'introduction intentionnelle de coupure dans le réseau conducteur de PANI. La plus forte sensibilité de S_R, comparée à R, est mise en évidence expérimentalement et par simulation numérique.
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Mok, Sui-tong. "The effects of social skills training for a group of F.1 pupils". Click to view the E-thesis via HKUTO, 1991. http://sunzi.lib.hku.hk/HKUTO/record/B38627310.
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Mok, Sui-tong, i 莫瑞棠. "The effects of social skills training for a group of F.1 pupils". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1991. http://hub.hku.hk/bib/B38627310.
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Shelton, Michael S. "Development of a 1/7-scale F/A-18 UAV for supermaneuverability research". Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/26470.
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Jayaraman, Rajsekhar. "Reliability and 1/f noise properties of MOSFETs with nitrided oxide gate dielectrics". Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/41582.
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Bylund, Martin. "E, F, G eller 0, 1, 3 : En studie av gitarrlärare på Youtube". Thesis, Linnéuniversitetet, Institutionen för musik och bild (MB), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-96717.
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Gitarren delar ett problem men andra stränginstrument såsom fiolen – samma ton i samma oktav kan ofta produceras på flera olika ställen på greppbrädan. Gitarrens bandförsedda greppbräda möjliggör även att göra det utan att det behöver vara mer speltekniskt krävande. Å andra sidan innebär det att gitarristen måste fatta beslut om var på greppbrädan en viss ton ska spelas, eller att de medierande redskap, vilka används för att mediera musik, måste förtydliga var på greppbrädan fingrarna ska placeras. Föreliggande studie har genomförts med syfte att belysa vilken kunskap som framstår som viktig för gitarrister och vilken lärarens roll är i YouTube-lektioner. Det gjordes genom en tematisk analys med en sociokulturell ansats. Tre YouTube-gitarrlärares lektioner analyserades och mönster beträffande vilka medierande redskap de använde sig av hittades och delades in i temana musikteoretiska begrepp, orientering på greppbrädan, tekniska färdigheter samt lärarroll. Resultatet visar att musikteoretiska begrepp framstår som viktig kunskap för gitarrister men att fingrarnas placering på greppbrädan, alltså orienteringen på greppbrädan, medieras genom andra redskap såsom siffror (och tabulatur), ackorddiagram och mönster. Det tydliggjordes att de tekniska färdigheterna plektrumteknik, fingerrörelser på greppbrädan och snabbhet framstår som viktigt. Lärarnas roll tycks vara att mediera redskap, vilka de lärande kan använda sig av i sitt musicerande. Hur de här redskapen ska användas i musicerandet verkar dock approprieras i andra sociala sammanhang.The guitar as an instrument shares a problem with other stringed instruments such as the violin – the same note in the same octave can often be produced in various positions on the fingerboard. The fretted fingerboard of the guitar makes it possible to play the note in different positions without it being more demanding in terms of skill, which leads to the need for the guitarist to make decisions as to where on the fretboard to play the note, or else for the mediating tools used to mediate music to specify where the fingers should be placed. This study was conducted in order to bring to light, what knowledge appears to be important to guitarist and what the teacher’s roll in YouTube tutorials is. This was done through a thematic analysis with a sociocultural approach. Patterns regarding which mediating tools are used by three YouTube guitar teachers were found and divided into the themes music theory terms, fretboard orientation, technical abilities and the roll of the teacher. The results show that music theory terms appear to be important knowledge for guitar players but that the placement of the fingers on the fretboard, in other words the fretboard orientation, is mediated through other tools such as numbers (and tablature), chord charts and patterns. It became evident that the technical abilities picking, finger movement on the fretboard and speed appear to be important. The teachers roll appears to be mediating tools which the learners can use in their musicianship. How to use these tools however seems to be appropriated in other social contexts.
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Libre, Camille. "Contrôle traductionnel des facteurs de restriction APOBEC3G/F par la protéine Vif du VIH-1". Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAJ067/document.
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Le VIH-1, via sa protéine Vif, contrecarre l’activité des facteurs de restriction A3G et A3F de plusieurs manières dont l’inhibition traductionnelle. Nous avons démontré que cette répression traductionnelle d’A3G par Vif est spécifique de la région 5’UTR. De plus, une séquence uORF contenue dans cette région est essentielle pour la régulation de la traduction ainsi que pour la répression par Vif. Nous avons montré qu’A3G et A3F sont traduits par leaky-scanning et ré-initiation et que la distance entre l’uORF et l’ORF principal est importante pour l’inhibition traductionnelle d’A3G et d’A3F. Ensuite, nous avons montré que ce mécanisme est très conservé à travers différents sous-types de Vif et que les acides aminés de Vif en position 39, 48 et 127 sont impliqués dans cette répression. Enfin, nous avons observé que l’interaction entre Vif et A3G est nécessaire pour la régulation traductionnelle. Des expériences de transfections des différents mutants d’A3G et d’A3F dans un système infectieux tel que le clone pNL4.3 sont envisagées. Celles-ci permettront de voir l’effet de l’uORF sur l’infectivité virale mais aussi sur l’assemblage, la maturation et la libération des nouvelles particules viralesThe HIV-1, through its Vif protein, counteracts the restriction factors A3G and A3F activity in several ways including translational inhibition. We demonstrated that this translational repression of A3G by Vif is specific of the 5’UTR. Moreover, an uORF sequence contained in this region is essential for both the translational regulation and the repression by Vif. We showed that A3G and A3F are translated by leaky-scanning and re-initiation mechanisms and that the distance between the two ORFs is important for the translational inhibition. Then, we showed that this mechanism is conserved among several Vif subtypes and that the Vif amino acids 39, 48 and 127 are implicated in this repression. Finally, we observed that the Vif-A3G interaction is necessary for the translational inhibition. A3G and A3F mutants transfections experiments into an infectious system like the pNL4.3 clone are considered. It will permit to observe the uORF effect on the viral infectivity but also on the assembly, the maturation and the release of the viral particles
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Tayou, Junior Kom. "Requirement of ßDELSEED-Motif of Escherichia coli F1FO ATP Synthase in Antimicrobial Peptide Binding". Digital Commons @ East Tennessee State University, 2011. https://dc.etsu.edu/etd/1260.
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F1FO ATP synthase is a membrane bound enzyme capable of synthesizing and hydrolyzing ATP. Lately, α-helical cationic peptides such as melittin and melittin related peptide (MRP) were shown to inhibit E. coli ATP synthase. The proposed but unconfirmed site of inhibition is βDELSEED-motif formed by the residues 380-386, located at the interface of α/β subunit of ATP synthase. This project was a mutagenic analysis of βDELSEED-motif residues to understand the binding mechanism and mode of action of peptide inhibitors. The study addressed 2 main questions: Are the antibacterial/anticancer effects of these peptides related to their inhibitory action on ATP synthase through interaction with the βDELSEED-motif? If so, which amino acid residues play critical role in peptide binding?
The findings demonstrated that the βDELSEED-motif is the binding site of the above peptides on ATP synthase and Glutamate residues are more important in peptide binding than the Aspartate residues.
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Macků, Robert. "Analýza fluktuačních procesů v solárních článcích". Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-233560.
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The thesis deals issue of the silicon solar cells non-destructive testing. The manufacturing technology of solar cells currently features a very high level of perfection. Its further development appears to be limited by amongst other issues imperfect diagnostic methods. The objective of presented research consists in non-destructive studies of processes that influence specimen life and reliability. To this end, I will employ mainly noise based analytical methods in connection with observation of defect optical activities, capacitance measurement etc. These methods are closely related to some specimen bulk imperfections, crystal-lattice defect induced traps, local-stress-subjected regions and, finally, breakdowns, which might bring about specimen destruction. Based on a detailed study and understanding of transport processes, regions in which noise is generated can be identified and appropriate technological measures can be proposed and adopted. Presented research focuses, first of all, on the real solar cell structures, which are inhomogeneous in their nature and are difficult to diagnose. The significant part of this study is attend to the random n-level (in most case just two-level) impulse noise, usually referred to as microplasma noise. This noise is a consequence of local breakdowns in micro-sized regions and brings about reduction of lifetime or destruction of the pn junction. The micro-sized regions have been studied separately by electrical and optical methods and defect properties have been put forward. Nevertheless, no less significant part of the thesis is devoted to the fluctuation modeling of the bulk imperfections in the semi-analytical form.
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Yang, Fan. "Bruit en 1/f de films minces de manganite La0,7Sr0,3MnO3 pour application en bolométrie". Phd thesis, Université de Caen, 2005. http://tel.archives-ouvertes.fr/tel-00130063.
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Les films minces de manganites ont un fort de coefficient de température à température ambiante et sont donc potentiellement intéressants pour la réalisation de microbolomètres non refroidis. Cependant, l'étude approfondie du bruit à basse fréquence dans ces matériaux est nécessaire avant d'envisager de réelles applications. Ce travail de thèse a été consacré à l'étude du coefficient de température et du bruit en 1/f dans des couches minces de La0,7Sr0,3MnO3 (LSMO). Les couches de LSMO étudiées ont été déposées sur deux substrats différents (SrTiO3 et (LaAlO3)0,3(Sr2AlTaO6)0,7) par ablation laser pulsé. La mise en forme des motifs avec différentes géométries a été effectuée par photolithographie et gravure ionique. Les échantillons connectés en quatre points sont mesurés à l'aide d'un amplificateur ayant un très faible niveau de bruit blanc (1,3 nV.Hz-1/2) et une très basse fréquence de recouvrement (10 Hz). Les mesures de diffraction de rayons X, d'aimantation, de magnétorésistance et de R(T) ont permis de connaître les propriétés générales des films. Nous avons cherché à vérifier la relation de Hooge (en fonction de la fréquence, du courant de polarisation et de la géométrie des motifs). Les mesures de bruit dans la gamme de température de 300 à 400 K indique l'absence l'excès de bruit au passage de la transition de phase. Des valeurs de paramètre de Hooge de l'ordre de 1 à 3 ont été mesurées, ce qui place ces résultats parmi les meilleurs publiés. Nous avons enfin estimé les performances d'un microbolomètre à partir de mesure de R(T) et de bruit.
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Weiss, Nicolas Henn Hans-Werner. "Cohomologie de 'GL IND. 2' (Zi, 1/2]) à coefficients dans 'F IND. 2' /". Paris, 2007. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016607533&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
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Cowger, Ashlin Elaine. "Bioaerosols Associated with Evaporative Cooler Use in Low-Income Homes in Semi-Arid Climates". BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/8571.
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Asthma is the leading chronic illness in children in the United States. Since children in the U.S. spend a majority of their time indoors there is an increased need to understand key sources of daily asthma triggers in the home. Bacterial endotoxin, dust mite allergens and β-D-glucan have been shown to be potent inducers of asthma attacks, and high levels of these allergens in homes can trigger attacks in those with asthma. We aim to better understand the risks to those with asthma that might be associated with evaporative cooler (EC) use in low-income homes. ECs are often promoted because of their low energy consumption and decreased environmental impact compared to central air conditioning (AC). Because of their lower cost, ECs are more widely used in low-income homes. ECs use evaporation to cool the air, which leads to higher indoor relative humidity. This may create an ecological niche for house dust mites in semi-arid climates where they are normally absent. EC sump water also provides an ideal environment for bacteria and fungi to grow, possibly resulting in EC loading the air with more potential asthma triggers than central air conditioning. We sampled low-income homes around Utah county with central air and evaporative cooling and tested them for the presence of dust mite allergens, β-D-glucan and endotoxin. There were significantly higher levels of endotoxins and β-(1→3)-D-glucans in the EC homes compared to the AC homes, with increased odds of dust mite allergen prevalence but not at clinically significant levels. These findings suggest that in semi-arid environments, endotoxin and β-(1→3)-D-glucan levels in homes with evaporative coolers are more elevated than dust mite allergens.
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Hassis, Wala. "Etude de structures avancées pour la détection IR quantique à haute température". Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENY013/document.
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La détection IR quantique met classiquement en jeu l'absorption de photons dans le matériau semi-conducteur II-VI CdHgTe. Cet alliage présente la particularité de permettre un ajustage du gap du semi-conducteur aux longueurs d'onde couvrant toute la gamme IR en jouant simplement sur la composition de l'alliage, ce qui en fait un matériau de choix. Cependant,les petits gaps en jeu ici imposent un refroidissement des plans focaux à des températures généralement cryogéniques (typiquement la centaine de Kelvins). Ce refroidissement représente naturellement une limite importante dans l'exploitation, l'encombrement et le coût de tels détecteurs.Un des grands défis à venir dans le domaine de la détection IR quantique est la détection à plus haute température. Une figure de mérite populaire pour examiner le fonctionnement de ces détecteurs est le courant d'obscurité qui reflète son bruit, dans le cas d'un détecteur limité par le bruit de courant (shot noise). Or, du fait des propriétés électriques du matériau semi-conducteur utilisé, ce courant d'obscurité augmente fortement avec le réchauffement du détecteur et rend son utilisation impossible à haute température. De plus, un autre phénomène apparaît également limiter le fonctionnement de nos photo-détecteurs : à hautes températures apparaît du bruit 1/f dont l'origine n'est pas parfaitement comprise aujourd'hui (matériau bulk ou interfaces, le débats reste ouvert…).Ce travail de thèse a pour objectif de comprendre les phénomènes physique régissant le bruit 1/f dans les photodiodes CdHgTe à travers la variation d'un bon nombre de paramètres physique et géométriques en vue de mettre en évidence la ou les corrélations de ce bruit avec ces variantesThe IR sensor makes quantum conventionally involves the absorption of photons in the semiconductor CdHgTe II -VI material . This alloy has a feature to allow an adjustment of the gap of the semiconductor at wavelengths covering the whole IR range by simply varying the composition of the alloy, which makes it a material of choice . However, small gaps at stake here impose a focal cooling to cryogenic temperatures generally planes ( typically hundred Kelvins ) . This cooling naturally represents an important limitation in the operation , the size and cost of such detectors .One of the great challenges ahead in the field of quantum IR detection is the detection at higher temperatures . A figure of merit for popular review the operation of these sensors is the dark current , which reflects its sound , in the case of a noise-limited current ( shot noise) detector. However, because the electrical properties of the semiconductor material used , the dark current increases sharply with the heating of the detector and makes it impossible to use at high temperature . In addition, another phenomenon also appears to limit the functionality of our photo-detectors: high temperature appears on the 1 / f noise whose origin is not fully understood today ( or bulk material interfaces , the debate remains open ... ) .To understand the physical phenomena governing the 1 / f noise in HgCdTe photodiodes through the variation this thesis aims to lots of physical and geometrical parameters in order to highlight the correlations or noise with these variants
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Al, Murad Zainy Mshco Hajy. "Complexity matching processes during the coupling of biological systems : application to rehabilitation in elderly". Thesis, Montpellier, 2019. http://www.theses.fr/2019MONT4001/document.
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Plusieurs cadres théoriques ont tenté de rendre compte des processus de synchronisation interpersonnelle. Les théories cognitivistes suggèrent que la synchronisation est réalisée par le biais d’une correction discrète et mutuelle des asynchronies entre les deux partenaires. Les théories dynamiques reposent sur l’hypothèse d’un couplage continu des deux systèmes, conçus comme oscillateurs auto-entretenus. Enfin le modèle du complexity matching repose sur l’hypothèse d’une coordination multi-échelle entre les deux systèmes en interaction. Dans un premier temps, nous développons des tests statistiques permettant de repérer dans les données expérimentales les signatures typiques de ces trois modes de coordination. Nous proposons notamment une signature multifractale, basée sur l’analyse des corrélations entre les spectres multifractals caractérisant les séries produites par les deux systèmes en interaction. Nous développons également une analyse de cross-corrélation fenêtrée, qui permet de dévoiler les processus locaux de synchronisation mis en œuvre. Ces études nous permettent de revisiter un certain nombre de travaux antérieurs. Nous montrons notamment que si la synchronisation de tâches discrètes telles que le tapping repose en effet sur des processus de correction discrète des asynchronies, la synchronisation de tâches continues telles que les oscillations de pendules est essentiellement basée sur les mêmes principes de correction discrète, et non sur un couplage continu des effecteurs. Nos résultats indiquent également que la synchronisation peut révéler des mécanismes hybrides mixant notamment correction des asynchronies et complexity matching. Enfin nous mettons en évidence que la marche synchronisée met en œuvre un effet dominant de complexity matching, d’autant plus prégnant que les deux partenaires sont étroitement couplés (marche bras-dessus-bras-dessous). Nous proposons dans un second temps d’exploiter ce résultat pour tester la possibilité d’une restauration de la complexité chez les personnes âgées. Le vieillissement a en effet été caractérisé comme un processus de perte graduelle de complexité, et cet effet a été notamment documenté dans le domaine de la locomotion. Il a notamment été montré que la perte de complexité corrélait avec la propension à la chute. La théorie du complexity matching suppose que deux systèmes en interaction tendent à aligner leurs niveaux de complexité. Elle suppose également que lorsque deux systèmes de niveaux différents de complexité interagissent, le système le plus complexe tend à attirer le moins complexe, engendrant un accroissement de la complexité chez le second. Nous montrons, dans un protocole au cours duquel des personnes âgées sont invitées à marcher bras-dessus-bras-dessous avec un accompagnant jeune, que la synchronisation entre les deux partenaires est réalisée au travers d’un effet d’appariement des complexités, et que l’entrainement prolongé en marche synchronisée permet une restauration de la complexité de la locomotion chez les personnes âgées. Cet effet perdure lors d’un post-test réalisé deux semaines après la fin de l’entraînement. Ce résultat, outre le fait qu’il conforte un des aspects essentiels de la théorie du complexity matching, ouvre de nouvelles voies de recherche pour la conception de stratégies de réhabilitation et de prévention de la chuteSeveral theoretical frameworks have attempted to account for interpersonal synchronization processes. Cognitive theories suggest that synchronization is achieved through discrete and mutual corrections of asynchronies between the two partners. The dynamic theories are based on the assumption of a continuous coupling between the two systems, conceived as self-sustained oscillators. Finally, the complexity matching model is based on the assumption of a multi-scale coordination between the two interacting systems. As a first step, we develop statistical tests in order to identify, in experimental data, the typical signatures of these three modes of coordination. In particular, we propose a multifractal signature, based on the analysis of correlations between the multifractal spectra characterizing the series produced by the two interacting systems. We also develop a windowed cross-correlation analysis, which aims at revealing the nature of the local synchronization processes. These studies allow us to revisit a number of previous works. We show that if the synchronization of discrete tasks such as tapping relies on discrete correction processes of asynchronies, the synchronization of continuous tasks such as pendulum oscillations is essentially based on the same principles of discrete correction, and not on a continuous coupling of effectors. Our results also indicate that synchronization could be sustained by hybrid mechanisms mixing notably asynchronies correction and complexity matching. Finally we highlight that synchronized walking is based on a dominant effect of complexity matching, especially when partners are closely coupled (arm-in-arm walking). We propose in a second step to exploit this result to test the possibility of a restoration of complexity in the elderly. Aging has indeed been characterized as a process of gradual loss of complexity, and this effect has been particularly documented in the field of locomotion. In particular, it has been shown that the loss of complexity correlates in older people with the propensity to fall. Complex matching theory assumes that two interacting systems tend to align their complexity levels. It also assumes that when two systems of different levels of complexity interact, the more complex system tends to attract the less complex, causing an increase in complexity in the second. We show, in a protocol in which older people are invited to walk arm-in-arm with a younger companion, that synchronization between the two partners is achieved through a complexity matching effect, and that prolonged training in such synchronized walking allows a restoration of the complexity of locomotion in the elderly. This effect persists during a post-test conducted two weeks after the end of the training sessions. This result, in addition to reinforcing one of the essential aspects of the theory of complexity matching, opens new avenues of research for the design of rehabilitation and fall prevention strategies
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Sassine, Gilbert. "Etude du transport et du bruit dans les couches 2D de nanotubes de carbone". Thesis, Montpellier 2, 2012. http://www.theses.fr/2012MON20182/document.
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Les travaux de la thèse ont porté sur l'étude, la réalisation, la caractérisation et la modélisation de films 2D à base de nanotubes de carbone. Dans le premier chapitre nous avons présenté des généralités sur les nanotubes de carbone. Ensuite, nous nous sommes intéressés aux jonctions nanotube-nanotube et plus particulièrement à la modélisation du transport dans les différents types de jonction (M/M), (M/SC) et (SC/SC). Avec le deuxième chapitre nous avons entamé l'étude des films 2D à base de nanotubes de carbone. Dans un premier temps nous nous sommes intéressés au transport électrique dans ces structures fortement inhomogènes, en particulier en décrivant les modèles analytiques rendant compte du phénomène de percolation tant au niveau de la conductance que du bruit en 1/f. La seconde partie du chapitre est entièrement consacrée à la fabrication et la caractérisation physico-chimique des films 2D L'objectif principal du troisième chapitre est la modélisation des films 2D de nanotubes de carbone. Par rapport aux autres modèles utilisés dans la littérature, le modèle développé dans cette partie est le seul à prendre en compte la nature physique de chaque jonction tube-tube : (M/M) ou (M/SC) ou (SC/SC). Notre modèle prend ainsi en compte les non linéarités des jonctions. La résolution numérique de ce système est optimisée : i) en utilisant la technique MNA, technique dont le principe consiste à linéariser chaque dipôle du circuit. ii) en parallélisant les calculs sur un cluster informatique d'une centaine de cœurs. Pour le calcul du bruit la même technique est utilisée mais avec, dans ce cas, l'utilisation de la méthode du réseau adjoint. Dans le quatrième chapitre, nous avons, dans un premier temps, présentés et analysés nos résultats expérimentaux concernant la mesure de la conductance et du bruit en 1/f. Quelles que soient les conditions de dépôt nous avons toujours observé un comportement de type percolation au niveau des grandeurs mesurées, conductance et niveau de bruit en 1/f. Nous avons utilisé les paramètres d'ajustement des lois de percolation pour comparer et analyser nos résultats. Il en ressort que l'impact du surfactant sur l'homogénéité de la solution, se retrouve au niveau des résultats électriques des couches déposées, montrant l'avantage d'utiliser du sel biliaire. Quant à l'influence de la densité des tubes, comme attendu, la conductance augmente avec celle-ci. Par contre nous avons remarqué que le bruit en 1/f était beaucoup plus sensible à ce paramètre, avec en particulier un changement significatif au niveau des paramètres de percolation en bruit mis en évidence à forte densité de nanotubes. La deuxième partie de ce chapitre est dédiée à la simulation des paramètres électriques de nos structures expérimentales. Nous avons paramétré l'énergie et la largeur des barrières de potentiel entre chaque jonction. Ces paramètres sont ajustés à partir des résultats expérimentaux et sont fonction de la nature du surfactant. Les résultats de ces simulations concernant la conductance et le niveau de bruit en 1/f s'accordent avec les mesures et dans tous les cas les lois de percolation macroscopique sont respectées, ce qui valide nos modèles ainsi que la possibilité d'intégrer de façon réaliste la différence structurale des surfactants. Pour rendre compte de la déviation de la loi macroscopique de percolation du bruit en 1/f, observée sur les films déposés à partir de solution à forte densité de surfactant, nous avons au niveau des simulations introduit et modulé le nombre d'amas (clusters) de nanotubes en fonction de la densité des couches. Là encore le bon accord observé avec les résultats expérimentaux nous permet de valider la présence d'inhomogénéités dues aux clusters de nanotubes dans nos dépôtsIn this thesis we have focused on the fabrication, the characterization, and the modeling of 2D films based on carbon nanotubes.In the first chapter, we have presented general informations on carbon nanotubes. Then we are interested in the nanotube-nanotube junctions and particularly the modeling of transport in different types of junction (M/M), (M/SC) and (SC/SC).In the second chapter we have presented a study of 2D films based on carbon nanotubes. At first we present the electrical transport in these structures strongly inhomogeneous, especially in describing the analytical models accounting for the percolation phenomenon both in the conductance and 1/f noise. The second part of the chapter is devoted entirely to the manufacture and physico-chemical characterization of 2D films.The main objective of the third chapter is the modeling of 2D films of carbon nanotubes. Compared to other models described in the literature, the model developed in this section is the only one that take into account the physical nature of each tube-tube junction (M/M) or (M/SC) or (SC/SC). Our model takes into account the junction nonlinearity. The numerical solution of the system is optimized: i) using the MNA technique whose principle is to linearize each dipole in the circuit. ii) parallelizing computations on a computer cluster of a hundred core. For the noise simulation, the same technique is used but in this case, we have used the adjoint network method. In the fourth chapter, we have, at first, presented and analyzed our experimental results for conductance and 1/f noise. Whatever the deposition conditions we always observed a percolation-like behavior of our results. We used the fitting parameters of the percolation laws to compare and analyze our results. It appears that the impact of the surfactant on the homogeneity of the solution is found in the electrical measurement results of deposited films. As for the influence of the density of the tubes, as expected, the conductance increases with the increase of nanotubes density. We noticed that the 1/f noise was much more sensitive to this parameter, with in particular a significant change in the noise percolation parameters revealed at high density of nanotubes. The second part of this chapter is dedicated to the simulation of the electrical parameters of our experimental structures. These parameters are adjusted on the basis of experimental results and are based on the nature of the surfactant. The results of these simulations for the conductance and 1/f noise agree with measurements and in all cases the macroscopic percolation laws are respected, which validate our models. To bring to the fore the deviation from the noise percolation law observed in films deposited from solution with a high density of surfactant, we have introduced in our simulated structures a number of clusters of nanotubes according to the density of the deposited layers. Once again we observed a good agreement with the experimental results allowing us to validate the presence of clusters of nanotubes in our deposited films