Dissertationen zum Thema „Soft transforms“
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Schlotter, William F. „Lensless fourier transform holography with soft x-rays /“. May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
Der volle Inhalt der QuelleLaboureix, Bastien. „Hyperplans arithmétiques : connexité, reconnaissance et transformations“. Electronic Thesis or Diss., Université de Lorraine, 2024. http://www.theses.fr/2024LORR0040.
Der volle Inhalt der QuelleThe digital world is littered with discrete mathematical structures, designed to be easily manipulated by a computer while giving our brains the impression of beautiful continuous real shapes. Digital images can thus be seen as subsets of Z^2. In discrete geometry, we are interested in the structures of Z^d and seek to establish geometric or topological properties on these objects. While the questions we ask are relatively simple in Euclidean geometry, they become much more difficult in discrete geometry: no more division, goodbye to limits, everything is just arithmetic. This thesis is also an opportunity to juggle many elementary notions of mathematics and computer science (linear algebra, rings, automata, real analysis, arithmetic, combinatorics) to solve discrete geometry questions. We are interested in the fundamental structures of this geometry: arithmetic hyperplanes. These have a very simple and purely arithmetical definition: an arithmetical hyperplane is the set of integer points lying between two parallel (real) affine hyperplanes. In this thesis, we discuss three problems involving arithmetic hyperplanes:- connectedness: is an arithmetic hyperplane composed of a single piece or of several pieces? The main contribution of this manuscript is to extend results already known for facewise connectedness for any neighbourhood. While certain phenomena remain in the general case, the combinatorial explosion makes it difficult to adapt known algorithms to solve the problem. We therefore adopt an analytical approach and prove connectivity properties by studying the regularity of a function. - recognition: how can we find out the characteristics of an arithmetic hyperplane? This is a more traditional problem in discrete geometry, with a very rich literature. To solve it, we propose a recognition algorithm based on the generalised Stern-Brocot tree. In particular, we introduce the notion of separating chord, which geometrically characterises the zones to which the parameters of an arithmetic hyperplane belong. - soft transformations: how can an arithmetic hyperplane be continuously transformed using translations or rotations? A discrete approach to homotopic transformations, we characterise the possible pixel movements in a discrete structure while preserving its geometric properties. Beyond the study of these problems and the results we were able to obtain, this thesis shows the interest of using the reals, and in particular real analysis, to better understand arithmetic hyperplanes. Arithmetic hyperplanes are largely characterised by their normal vector, which is often considered integer to obtain periodicity properties. Considering any real normal vectors provides greater flexibility and eliminates the noise induced by the arithmetic relationships of the vector. Finally, opening up to the real again is a way of building bridges to other branches of mathematics, such as word combinatorics or numbering systems
Kim, Hyun Sik. „High performance fourier transform mass spectrometry : soft ionization methods and resolution enhancement /“. The Ohio State University, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487859879937953.
Der volle Inhalt der QuelleMurthy, Bellur Dakshina S. „Hard-Switching and Soft-Switching Two-Switch Flyback PWM DC-DC Converters and Winding Loss due to Harmonics in High-Frequency Transformers“. Wright State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=wright1278704361.
Der volle Inhalt der QuelleSuh, Sangwook. „Low-power discrete Fourier transform and soft-decision Viterbi decoder for OFDM receivers“. Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42716.
Der volle Inhalt der QuelleShomo, Ronald Edward II. „Soft ionization techniques for Fourier transform ion cyclotron resonance and quadrupole mass spectrometry /“. The Ohio State University, 1988. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487597424138083.
Der volle Inhalt der QuelleArumuganainar, Ponnappan. „Automatic soft plaque detection from CTA“. Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26690.
Der volle Inhalt der QuelleCommittee Chair: Tannenbaum, Allen; Committee Member: Skrinjar, Oskar; Committee Member: Yezzi, Anthony. Part of the SMARTech Electronic Thesis and Dissertation Collection.
An, Zhong. „Interpretation of X-ray and microwave images : some transform methods and phase unwrapping“. Thesis, King's College London (University of London), 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313792.
Der volle Inhalt der QuelleWalker, M. Karen. „Rhetorical work in soft power diplomacy| The U.S.-India 123 Agreement and a relationship transformed“. Thesis, University of Maryland, College Park, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3644039.
Der volle Inhalt der QuelleMy dissertation, The Rhetorical Work of Soft Power: The U.S.-India 123 Agreement and a Relationship Transformed, broadens and deepens our understanding of soft power diplomacy as a creation of constitutive rhetoric. I perform a rhetorical critique of discourses generated during three years' debate on the U.S.-India 123 Agreement, a watershed moment in bilateral relations. In Chapter 1, I introduce the frames of reference that guided my research, set my project within the literature stream, and lay foundations for my argument.
In Chapter 2, I explore how soft power discourse facilitated India's diplomatic move from outside to inside the nonproliferation regime. I introduce identification and courtship as constructs to explain soft power attraction, presenting narratives of exceptionalism, deliverance and kinship that emerged from discourse. In Chapter 3, I explain the bilateral movement from estranged to engaged as deepened identification and consubstantiation, the achievement of a permanent union. I trace the development of "democracy," "pluralism," and "creativity" as terms of ideological commitment and mutual obligation. I also present two additional narratives, the sojourner narrative, which reconstituted the Indian Diaspora's political identity, and the convergence narrative, which constituted the United States and India as bilateral partners and transformed the U.S.-India 123 Agreement from an idea about nuclear cooperation into the embodiment of a resilient, enduring, and comprehensive partnership. Each narrative drew in substances of identification that reduced recalcitrance, changed perspectives, overcame estrangement, and motivated concerted action.
Chapter 4 outlines benefits of my research for rhetoricians, soft power proponents, and diplomacy specialists. For rhetoricians, I enrich our limited study of diplomatic discourse and generate insight into dramatistic theory and criticism. For soft power theorists, my project as a whole gives explanatory force to soft power as a creation of constitutive rhetoric. The consequent reinterpretation of the telos, processes, and resources of soft power makes soft power attraction more transparent. For the diplomatic corps, I encourage new ways of conceptualizing and talking about diplomatic aims and achievements. Chapter 4 thus frames longer-term objectives to further develop the rhetoric of diplomacy, to undertake theory-building in soft power diplomacy, and to integrate soft power diplomacy with diplomatic tradecraft.
Geilhufe, Jan [Verfasser], Stefan [Akademischer Betreuer] Eisebitt und Thomas [Akademischer Betreuer] Wilhein. „High resolution soft X-ray Fourier transform holography / Jan Geilhufe. Gutachter: Stefan Eisebitt ; Thomas Wilhein. Betreuer: Stefan Eisebitt“. Berlin : Technische Universität Berlin, 2015. http://d-nb.info/1067388575/34.
Der volle Inhalt der QuelleLocklin, Scott Christopher. „Fourier transform spectroscopy in the soft X-ray regime : an instrument for the study of the spectrum of helium /“. For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2004. http://uclibs.org/PID/11984.
Der volle Inhalt der QuelleMondragon, Sanchez Juan Antonio. „Etude par spectroscopie optique de structures d'ADN soit contenant des bases ou chaines modifiées, soit en interaction avec des ions divalents“. Paris 13, 2005. http://www.theses.fr/2005PA132004.
Der volle Inhalt der QuelleLI, QUAN, und q. li@cqu edu au. „HIGH FREQUENCY TRANSFORMER LINKED CONVERTERS FOR PHOTOVOLTAIC APPLICATIONS“. Central Queensland University. N/A, 2006. http://library-resources.cqu.edu.au./thesis/adt-QCQU/public/adt-QCQU20060830.110106.
Der volle Inhalt der QuelleHamdad, Fatemeh-Soheila. „Three-phase AC-to-DC soft-switching HF transformer isolated converters with power factor correction and low harmonic distortion“. Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0005/NQ40540.pdf.
Der volle Inhalt der QuellePfau, Bastian [Verfasser], Stefan [Akademischer Betreuer] Eisebitt, Manfred [Akademischer Betreuer] Albrecht und Mario [Akademischer Betreuer] Dähne. „Imaging magnetic nanostructures using soft x-ray Fourier transform holography / Bastian Pfau. Gutachter: Stefan Eisebitt ; Manfred Albrecht ; Mario Dähne. Betreuer: Stefan Eisebitt“. Berlin : Technische Universität Berlin, 2013. http://d-nb.info/1067385428/34.
Der volle Inhalt der QuelleSIPES, NANCY JO. „GROWTH REGULATION OF HUMAN MELANOMA: FACTORS INVOLVED IN THE EXPRESSION OF THE TRANSFORMED PHENOTYPE (SOFT AGAR, GROWTH FACTORS, PLATELETS, ENDOTHELIAL CELLS, PARACRINE)“. Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/183788.
Der volle Inhalt der QuelleDanekar, Abhishek V. „Analysis and Design of High-Frequency Soft-Switching DC-DC Converter for Wireless Power Charging Applications“. Wright State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright1493990400812363.
Der volle Inhalt der QuelleManuzon, Michele Yabes. „Investigation of Pseudomonas Biofilm Development and Removal on Dairy Processing Equipment Surfaces Using Fourier Transform Infrared (FT-IR) Spectroscopy“. The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1253576498.
Der volle Inhalt der QuelleLi, Quan, und q. li@cqu edu au. „DEVELOPMENT OF HIGH FREQUENCY POWER CONVERSION TECHNOLOGIES FOR GRID INTERACTIVE PV SYSTEMS“. Central Queensland University. School of Advanced Technologies & Processes, 2002. http://library-resources.cqu.edu.au./thesis/adt-QCQU/public/adt-QCQU20020807.152750.
Der volle Inhalt der QuelleKjellqvist, Tommy. „On Design of a Compact Primary Switched Conversion System for Electric Railway Propulsion“. Doctoral thesis, Stockholm : Skolan för elektro- och systemteknik, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10428.
Der volle Inhalt der QuelleAmrhein, Andrew Aloysius. „Induction Heating of Aluminum Cookware“. Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/77400.
Der volle Inhalt der QuelleMaster of Science
Voss, Johannes [Verfasser], Doncker Rik W. [Akademischer Betreuer] De und H. Alan [Akademischer Betreuer] Mantooth. „Multi-megawatt three-phase dual-active bridge dC-dC converter : extending soft-switching operating range with auxiliary-resonant commutated poles and compensating transformer saturation effects / Johannes Voss ; Rik W. de Doncker, H. Alan Mantooth“. Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1217788972/34.
Der volle Inhalt der QuelleJanda, Ondřej. „Umělá inteligence v diagnostice výkonových olejových transformátorů“. Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-234173.
Der volle Inhalt der QuelleWang, Kun. „Algorithmes et méthodes pour le diagnostic ex-situ et in-situ de systèmes piles à combustible haute température de type oxyde solide“. Phd thesis, Université de Franche-Comté, 2012. http://tel.archives-ouvertes.fr/tel-01017170.
Der volle Inhalt der QuelleRousseau, Frédéric. „Etude des mécanismes de formation des couches d' oxyde Perovskite par procédé plasma basse pression à tuyère supersonique pour l' élaboration de la cathode des piles à combustible SOFC : modélisation et caractérisation expérimentale“. Paris 6, 2005. http://www.theses.fr/2005PA066543.
Der volle Inhalt der QuelleMeier, Stephan. „System Aspects and Modulation Strategies of an HVDC-based Converter System for Wind Farms“. Doctoral thesis, Stockholm : Skolan för elektro- och systemteknik, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10267.
Der volle Inhalt der QuelleRibeiro, de Faria Santos Kelly. „Design of a bidirectional on-board charger and a DC-DC converter for low voltage battery in Electric Vehicles“. Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPAST035.
Der volle Inhalt der QuelleThis dissertation focuses on the integration of two power electronic converters present in the electric vehicle (EV) architecture – the DC-DC con-verter interfacing the high and low voltage batteries (400V/14V) and the onboard charger (OBC). A three-port current-fed parallel resonant topology with zero voltage switching capability is developed. The con-verter allows bidirectional power flow between the three energy sources with high efficiency in both conversion modes, DC-DC and OBC while ensuring galvanic isolation.A compact three-winding planar transformer is de-signed based on EV industry requirements, empha-sizing the minimization of leakage inductances. In this design, the unequal currentsharing phenomenon between parallel-connected layers is addressed to ensure a homogeneous cur-rent distribution and eliminate the risks of thermal hotspots formation.A 7kW experimental prototype has been con-structed and tested, validating the analysis and op-eration of the proposed topology. Some sugges-tions and propositions are provided for future work aiming at efficiency improvement of the converter
Martin, Jérémy. „Caractérisation en commutation douce d'IGBT 6,5 kV pour l'application transformateur moyenne fréquence en traction ferroviaire“. Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0037/document.
Der volle Inhalt der QuelleThis thesis concerns the study and the rating of a high voltage multicellular converter with an intermediate medium frequency stage dedicated to railway traction. The objective is to reduce the weight and the volume of the AC-DC conversion stage which is implemented in railway engines running on 25kV-50Hz or 15kV-16Hz2/3 railways. Reduction on weight and size of the AC-DC converter may be applied on multiple unit trains where the transformer causes room loss for passengers and on locomotives and high speed trains where the axle load is limited. On one hand high voltage switches are required in order to minimize the number of cells used to build the converter. On the other hand, reducing the size and the weight of the transformer requires a high switching frequency, causing high commutation losses. To achieve soft switching conditions with high voltage semiconductors, the proposed topology is based on an association of dual structures. Each elementary converter combines a controlled turn-off voltage source inverter and a controlled turn-on current source inverter. In order to estimate the efficiency of the new topology, a prototype of one elementary cell working at 280 kVA, was built at the Power Electronics Associated Research Laboratory (PEARL). The switches are standard 6.5 kV/200A IGBTs modules. Soft-switching tests, in real operating conditions, allow evaluating IGBTs and diodes switching losses. Thanks to these results, it is possible to find the structure operating limits and to size the transformer considering the trade-off between the system efficiency and the transformer weight
Novotný, Radek. „Aplikace waveletové transformace v software Mathematica a Sage“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220339.
Der volle Inhalt der QuelleMezrag, Cédric. „Generalised Parton Distributions : from phenomenological approaches to Dyson-Schwinger equations“. Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112144/document.
Der volle Inhalt der QuelleThis study is devoted to generalised parton distributions (GPDs). First, the main properties of GPDs are given to the reader. One can stress the so-called support properties and the polynomiality property. The latter is automatically fulfiled when modeling GPDs from double distributions (DDs), GPDs being considered as the Radon transform of DDs. In the scalar case, two DDs denoted by F and G are required to describe the GPD H. Due to the integral relation existing between H on one hand, and F and G on the other hand, F and G are not defnied unambiguously. This ambiguity is exploited in the present work in order to develop a new phenomenological parametrisation. Using the Radyushkin Ansatz, it is then possible get a realistic model of GPDs, and to compare it with available experimental data. In the present case, two types of models, one neglecting the GPD E, the other taking it into account are compared with the Jlab Hall A DVCS data. In the former cae, one can notice a better flexibility allowing to better reproduced the beam-helicity independent cross sections. In the latter one, only the GPD E is deeply modified, and thus the comparison with available data does not change significantly with respect to previous parametrisations. Only data more sensitive to E will allow one to selet the most relevant parametrisation.In order to go beyond phenomenological parametrisations, a first step has been done toward a dynamical description of hadron structure. Using the Dyson-Schwinger equations, it has been possible to compute analytically the pion GPD within the triangle diagram approximation. The comparison with available data (Form factor and PDF) appears to be very good. Nevertheless, this first model does not fulfil all the required properties. Especially the soft pion theorem, which corresponds to a specific kinematical limit. It has been shown in this work that this is due to the violation of the Axial-Vector Ward-Takahashi identity, and that the triangle approximation is sufficient to ensure the sof pion theorem. Still it violates the exchange symmetry x, 1-x, and thus additional terms, previously neglected, are taken into account. It is then possible to compute the probability density to find a quark at a given position in the transverse plan carrying a given momentum fraction. Finally, perspective on lightcone computations are given in the last chapter
Cebrecos, Ruiz Alejandro. „Transmission, reflection and absorption in Sonic and Phononic Crystals“. Doctoral thesis, Universitat Politècnica de València, 2015. http://hdl.handle.net/10251/56463.
Der volle Inhalt der Quelle[ES] Los cristales fonónicos son materiales artificiales formados por una disposición periódica de inclusiones en un medio, pudiendo ambos ser de carácter sólido o fluido. Controlando la geometría y el contraste de impedancias entre los materiales constituyentes se pueden controlar las propiedades dispersivas de las ondas. Cuando una onda propagante se encuentra un medio con diferentes propiedades físicas puede ser transmitida y reflejada, en medios sin pérdidas, pero también absorbida, si la disipación es tenida en cuenta. La presente tesis está dedicada al estudio de diferentes efectos presentes en cristales sónicos y fonónicos relacionados con la transmisión, reflexión y absorción de ondas, así como el desarrollo de una técnica para la caracterización de sus propiedades dispersivas, descritas por la estructura de bandas. En primer lugar, se estudia el control de la propagación de ondas en transmisión en sistemas conservativos. Específicamente, nuestro interés se centra en mostrar cómo los cristales sónicos son capaces de modificar la dispersión espacial de las ondas propagantes, dando lugar al control del ensanchamiento de haces de sonido. Haciendo uso de las curvas de dispersión espacial extraídas del análisis de la estructura de bandas, se predice primero la difracción nula y negativa de ondas a frecuencias cercanas al borde de la banda, resultando en la colimación y focalización de haces acústicos en el interior y detrás de un cristal sónico 3D, y posteriormente se demuestra mediante medidas experimentales. La eficiencia de focalización de un cristal sónico 3D está limitada debido a las múltiples reflexiones existentes en el interior del cristal. Para superar esta limitación se consideran estructuras axisimétricas trabajando en el régimen de longitud de onda larga, como lentes de gradiente de índice. En este régimen, las reflexiones internas se reducen fuertemente y, en configuración axisimétrica, la adaptación de simetría con fuentes acústicas radiando haces de sonido incrementa la eficiencia drásticamente. Además, la teoría de homogenización puede ser empleada para modelar la estructura como un medio efectivo con propiedades físicas efectivas, permitiendo el estudio del frente de ondas en términos refractivos. Se mostrará el modelado, diseño y caracterización de un dispositivo de focalización eficiente basado en los conceptos anteriores. Considérese ahora una estructura periódica en la que uno de los parámetros de la red, sea el paso de red o el factor de llenado, cambia gradualmente a lo largo de la dirección de propagación. Los cristales chirp representan este concepto y son empleados aquí para demostrar un mecanismo novedoso de incremento de la intensidad de la onda sonora basado en un fenómeno conocido como reflexión "suave". Este incremento está relacionado con una ralentización progresiva de la onda conforme se propaga a través del material, asociado con la velocidad de grupo de la relación de dispersión local en los planos del cristal. Un modelo basado en la teoría de modos acoplados es propuesto para predecir e interpretar este efecto. Se observan dos fenómenos diferentes al considerar pérdidas en estructuras periódicas. Por un lado, si se considera la propagación de ondas sonoras en un array periódico de capas absorbentes, cuyo frente de ondas es paralelo a los planos del cristal, se produce una reducción anómala en la absorción combinada con un incremento simultáneo de la reflexión y transmisión a las frecuencias de Bragg, de forma contraria a la habitual reducción de la transmisión, característica de sistemas periódicos conservativos a estas frecuencias. En el caso de la misma estructura laminada en la que se cubre uno de sus lados mediante un reflector rígido, la incidencia de ondas sonoras desde un medio homogéneo, cuyo frente de ondas es perpendicular a los planos del cristal, produce un gran incremento de la fuerza de
[CAT] Els cristalls fonònics són materials artificials formats per una disposició d'inclusions en un medi, ambdós poden ser sòlids o fluids. Controlant la geometría i el contrast d'impedàncies dels seus materials constituents, és poden controlar les propietats dispersives de les ondes, permetent una gran varietatde fenòmens fonamentals interessants en el context de la propagació d'ones. Quan una ona propagant troba un medi amb pèrdues amb propietats físiques diferents es pot transmetre i reflectir, però també absorbida si la dissipació es té en compte. Aquests fenòmens fonamentals s'han explicat clàssicament en el context de medis homogenis, però també ha sigut un tema de creixent interés en el context d'estructures periòdiques en els últims anys. Aquesta tesi doctoral tracta de l'estudi de diferents efectes en cristalls fonònics i sònics lligats a la transmissió, reflexió i absorció d'ones, així com del desenvolupament d'una tècnica de caracterització de les propietats dispersives, descrites mitjançant la estructura de bandes. En primer lloc, s'estudia el control de la propagació ondulatori en transmissió en sistemes conservatius. Més específicament, el nostre interés és mostrar com els cristalls sonors poden modificar la dispersió espacial d'ones propagants donant lloc al control de l'amplària per difracció dels feixos sonors. Mitjançant les corbes dispersió espacial obtingudes de l'anàlisi de l'estructura de bandes, es prediu, en primer lloc, la difracció d'ones zero i negativa a freqüències próximes al final de banda. El resultat és la collimació i focalització de feixos sonors dins i darrere de cristalls de so. Després es mostra amb mesures experimentals. L'eficiència de focalització d'un cristall de so 3D està limitada per la gran dispersió d'ones dins del cristall, que és característic del règim difractiu. Per a superar aquesta limitació, estructures axisimètriques que treballen en el règim de llargues longituds d'ona, i es comporten com a lents de gradient d'índex. En aquest règim, la dispersió es redueix enormement i, en una configuració axisimètrica, a causa de l'acoblament de la simetría amb les fonts acústiques que radien feixos sonors, l'eficiència de radiació s'incrementa significativament. D'altra banda, la teoria d'homogeneïtzació es pot utilitzar per a modelar, dissenyar i caracteritzar un dispositiu eficient de focalització basat en aquests conceptes. Considerem ara una estructura periòdica en la qual un dels seus paràmetres de xarxa, com ara la constant de xarxa o el factor d'ompliment canvia gradualment al llarg de la direcció de propagació. Els cristalls chirped representen aquest concepte i s'utilitzen ací per a demostrar un mecanisme nou d'intensificació d'ones sonores basat en el fenòmen conegut com a reflexió "suau". La intensificació està relacionada amb la alentiment progressiva de l'ona conforme propaga al llarg del material, que està associada amb la velocitat de grup de la relació de dispersió local en els diferents plànols del cristall. Es proposa un model basat en la teoria de modes acoblats per a predir i interpretar este efecte. Dos fenòmens diferents cal destacar quan es tracta d'estructures periòdiques amb dissipació. Per un costat, al considerar la propagació d'ones sonores en el plànol en un array periòdic de capes absorbents, s'observa una disminució anòmala de l'absorció i es combina amb un augment simultani de reflexió i transmissió en les freqüències de Bragg que contrasta amb la usual disminució de transmissió, característica dels sistemes conservatius a eixes freqüències. Per a un medi similar de capes, amb un reflector rígid darrere, les ones fora del pla incidint l'estructura des de un medi homogeni, augmentaran considerablement la interacció. En altres paraules, el retràs temporal de les ones sonores dins del sistema periòdic augmentarà significativament produint un augmen
Cebrecos Ruiz, A. (2015). Transmission, reflection and absorption in Sonic and Phononic Crystals [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/56463
TESIS
Premiado
Almardy, Mohamed S. M. „Three-phase high-frequency transformer isolated soft-switching DC-DC resonant converters“. Thesis, 2011. http://hdl.handle.net/1828/3594.
Der volle Inhalt der QuelleGraduate
Jala, Sriram. „High frequency transformer isolated soft-switched hybrid phase modulated DC-to-DC converters“. Thesis, 2009. http://hdl.handle.net/1828/2584.
Der volle Inhalt der QuelleTu, Chiu-Chuan, und 杜秋娟. „Noisy Speech Detection and Musical Instruments Recognition by Wavelet Transform Analysis with Soft Computing Approach“. Thesis, 2012. http://ndltd.ncl.edu.tw/handle/48072580981931588785.
Der volle Inhalt der Quelle國立中興大學
電機工程學系所
101
This thesis applies wavelet features and soft computing-based classifiers to speech detection and musical instruments recognition problems. For speech detection, this thesis uses Haar wavelet energy and entropy (HWEE) as detection features. The Haar wavelet energy (HWE) is derived by using the robust band that shows the most significant difference between speech and nonspeech segments at different noise levels. Similarly, the wavelet energy entropy (WEE) is computed by selecting the two wavelet energy bands of which entropy shows the most significant speech/nonspeech difference. The HWEE features are fed as inputs to a recurrent self-evolving interval type-2 fuzzy neural network (RSEIT2FNN) for classification. The RSEIT2FNN is used because it uses type-2 fuzzy sets, which are more robust to noise than type-1 fuzzy sets. The recurrent structure in the RSEIT2FNN helps to remember the context information of a test frame. The HWEE-based RSEIT2FNN detection was applied to speech detection in different noisy environments with different noise levels. The most critical technology of musical instrument recognition is the extraction of musical instrument features, especially those distinguishing ones. To this end, this thesis proposes the incorporation of HWE and wavelet packet decomposition energy features into traditional audio features to improve recognition rate. For classifier design, this thesis proposes a divide-and-conquer support vector machine (SVM) classification technique. This technique efficiently captures the context information in audio signals with high-dimensional features for recognition improvement. Experimental results on the recognition of ten musical instruments show the effectiveness of the proposed recognition approach.
Rahman, M. M. Azizur. „Single stage soft-switched high-frequency transformer isolated AC-to-DC bridge converter and extension to multiphase converter“. Thesis, 2001. https://dspace.library.uvic.ca//handle/1828/10217.
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Hamdad, Fatemeh Soheila. „Three-phase AC-to-DC soft-switching HF transformer isolated converters with power factor correction and low harmonic distortion“. Thesis, 1999. https://dspace.library.uvic.ca//handle/1828/8824.
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Mason, Laura E. „Linking Chemical Changes in Soot and Polyaromatics to Cloud Droplet Formation“. 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-840.
Der volle Inhalt der QuelleMajumdar, Sayantan. „Flow Induced Instabilities, Shear-Thickening And Fluctuation Relations In Sheared Soft Matter“. Thesis, 2012. https://etd.iisc.ac.in/handle/2005/2560.
Der volle Inhalt der QuelleMajumdar, Sayantan. „Flow Induced Instabilities, Shear-Thickening And Fluctuation Relations In Sheared Soft Matter“. Thesis, 2012. http://hdl.handle.net/2005/2560.
Der volle Inhalt der QuelleLuo, Fei. „Soft-switched high-frequency transformer isolated single-cell DC-to-DC and multi-cell AC-to-DC converters controlled with a new gating scheme implemented on FPGA“. Thesis, 2005. http://hdl.handle.net/1828/1986.
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