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Kaiser, Chris P. "Optical heterodyne binary-DPSK systems." Thesis, University of Canterbury. Electrical and Electronic Engineering, 1994. http://hdl.handle.net/10092/5835.
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This thesis describes an investigation of the performance of binary differential phase shift keying (DPSK) modulation in an optical heterodyne communication system when both laser phase noise and shot noise are present. The laser phase noise is modelled as a Brownian motion process while the shot noise is modelled by additive white Gaussian noise. Four different receiver structures are considered: (i) the standard delay-and-multiply form, which is optimal when only the shot noise is present but is severely degraded by quite small amounts of phase noise; (ii) the matched receiver, which tolerates more phase noise by combating the most likely phase noise induced error-event; (iii) the innovations receiver that is derived to be optimal for small amounts of phase noise; and (iv) the weighted receiver, which is the innovations receiver optimised for minimum bit error rate (BER) at specific levels of phase and shot noise.
A new and accurate analysis of the standard receiver is presented, based on a perturbation solution for the probability density function (pdf) of filtered phase noise. This approach is used to verify the accuracy of a commonly applied approximation: that of neglecting the effects of narrow-band filtering on the magnitude of the phase noise corrupted signal. The well known BER floor effect of standard DPSK systems is observed. A second analysis method based on the moments of the receiver decision statistic is also presented. This method is found to be inaccurate for small BER's, and illustrates the difficulty in applying moment based methods to the extreme tail of a pdf.
To attempt to improve the phase noise tolerance of a DPSK receiver, the calculus of variations is used to determine the most-likely phase noise path that causes a detection error in the standard receiver. The matched receiver is then formulated, such that these phase noise paths are less likely to cause an error. An analysis of this receiver in terms of likelihood functions provides a lower bound on its BER. This result is then shown to yield an optimal rule for combining the various branches of the receiver, such that the performance bound can be achieved. Simulated results for the matched receiver show that it tolerates larger amounts of phase noise than the standard receiver, and that the BER floor has been lowered.
The application of the innovations approach allows a log-likelihood ratio to be formulated for the DPSK detection problem in terms of minimum mean-square-error estimates of the phase noise path. In order to evaluate these estimates, an approximation is used that is valid for small amounts of phase noise. This leads to a simple but useful form for the log-likelihood ratio, which is implemented by the innovations receiver. An expression for the BER floor of the innovations receiver is developed, which provides a comparison with the BER floor of the the standard receiver. Simulated results are also obtained, and combined with the BER floor results show that the innovations receiver does not offer much improvement over the standard receiver.
Investigation of the innovations receiver indicates that its relatively poor performance can be attributed to the small-phase-noise approximation used in its derivation. This results in the weighting factor of its band-pass filters being non-optimal for other than very small amounts of phase noise. Optimisation of this weighting factor as a function of the amount of phase and shot noise leads to the weighted receiver. This optimisation is achieved through the use of moments of the receiver decision statistic, for which a formulation is presented. Computed BER floors in conjunction with simulated results show that the weighted receiver performs significantly better than the standard receiver, and also better than the matched receiver. In particular, the BER floor of the weighted receiver can be lowered by trading off signal power, and can theoretically be reduced to an arbitrarily low level given enough received power.
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Mukun, Wang, Xu Bingxing, and Zhou Tingxiag. "The Research on Optimization of DPSK Errors Propagation." International Foundation for Telemetering, 1990. http://hdl.handle.net/10150/613793.
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International Telemetering Conference Proceedings / October 29-November 02, 1990 / Riviera Hotel and Convention Center, Las Vegas, NevadaThis paper put its focus on the errors propagation given by Differential phase shift keying (DPSK below) in industrial telemetering systems. There is analytical, comparative and calculative work about DPSK signals formed with different encoding moduses and about their errors propagation after demodulation.
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Hai, Md. "Minimizing temperature dependent spectral shift in SOI DPSK demodulators." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104852.
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Silicon on insulator (SOI) photonic devices are becoming popular due to their compatibility with complementary metal oxide semiconductor (CMOS) technology. Over the last five years, we have seen several practical demonstrations of high-speed optical modulators, switches, filters designed on SOI platform. Some of these devices were made utilizing one fundamental property of light: Interference. However, interference-based SOI devices show disastrous spectral phase shift with temperature change which result in the necessity of integrating active temperature control circuits to stabilize them. In this work we present a 50 Gb/sec SOI Mach-Zehnder interferometer (MZI) differential phase shift keying (DPSK) demodulator which exhibits over 90% improvement in thermal stability with 0.05 nm/C of its spectral profile compared to 0.9 nm/C for a noncompensated demodulators. Our proposed method is a fully passive way of minimizing temperature dependant spectral shift in DPSK demodulators, which employs the waveguide engineering method. A full analytical approach to address the problem is derived first, which is followed by extensive numerical simulations to find out the exact device dimensions. Through this, we present a step by step approach to design the demodulator by achieving required waveguide geometry. After we get the design values of our device parameters we calculate the spectral shift with temperature change by our customized computer program and observe improved performance of the device with temperature change. With the values of design variables, we fabricate our device through Canadian Microelectronics Corporation (CMC). The waveguide width of our device varies from 280 nm to 450 nm at different stage of the device while its height was fixed to 220 nm. For thermally non-compensated demodulator, waveguide width was 450 nm throughout the device. Both thermally compensated and non-compensated demodulators are built on the same chip. Experimental result of the fabricated device is presented and we compare different performance metric of the demodulator with and without the proposed temperature compensation technique.La recherche sur les composantes photoniques en silicium sur isolant (SOI) est devenue populaire en raison de leur compatibilité avec la technologie des semi-conducteur en métal complémentaire d'oxyde (CMOS). Pendant les cinq dernières années, nous avons vu plusieurs démonstrations pratiques de modulateurs optiques à grande vitesse, de commutateurs, et de filtres en SOI. Certaines de ces composantes utilisent une propriété fondamentale de lumière : l'interférence. Pourtant, les composantes en SOI à base d'interférence montrent un changement de phase spectral désastreux avec le changement de température qui s'ensuit d'une nécessité d'intégrer des circuits de contrôle actifs de température pour les stabiliser. Dans ce travail nous présentons un interféromètre Mach-Zehnder (MZI) en SOI à 50 Gb/sec pour la modulation de phase différentielle (DPSK). Le démodulateur a une stabilité thermale de 0.05 nm/0C qui est 90% meilleure que les démodulateurs non-compensés qui eux ont un profil spectral de 0.9 nm/0C. Notre méthode propose une façon complètement passive de minimiser l'effet de la température sur le changement spectral des démodulateurs DPSK. Une approche analytique complète suivi pardes simulations numériques permettent de définir les dimensions exactes du démodulateur. Nous présentons la géométrie due démodulateur. En utilisant les paramètres obtenus, nous calculons le changement spectral avec le changement de température en utilisant notre programme informatique conçu pour observer la performance du démodulateur. Le démodulateur a été fabriqué par la société de microélectrique Canadian (CMC). La largeur de la guide d'onde du démodulateur varie de 280 nm 450 nm et la hauteur est fixe à 220 nm. Pour le démodulateur non-compensé, la largeur du guide d'onde est 450 nm. Les démodulateurs tant compensés que non-compensés sont construits sur le même fragment. Les résultats expérimentaux sont présentés et nous comparons les différentes performances du démodulateur avec et sans la technique de compensation proposée.
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Jacobsson, Fredrik. "DPSK modulation format for optical communication using FBG demodulator." Thesis, Linköping University, Department of Science and Technology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2307.
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The task of the project was to evaluate a differential phase shift keying demodulation technique by replacing a Mach-Zehnder interferometer receiver with an optical filter (Fiber Bragg Grating). Computer simulations were made with single optical transmission, multi channel systems and transmission with combined angle/intensity modulated optical signals. The simulations showed good results at both 10 and 40 Gbit/s. Laboratory experiments were made at 10 Gbit/s to verify the simulation results. It was found that the demodulation technique worked, but not with satisfactory experimental results. The work was performed at Eindhoven University of Technology, Holland, within the framework of the STOLAS project at the department of Electro-optical communication.
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Krause, Lloyd O., Carlos Reyes-Nieves, and Ivor Frazier. "DPSK MODULATION AND DEMODULATION USING BULK ACOUSTIC WAVE (BAW) DELAY ELEMENTS." International Foundation for Telemetering, 1986. http://hdl.handle.net/10150/615573.
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International Telemetering Conference Proceedings / October 13-16, 1986 / Riviera Hotel, Las Vegas, NevadaDPSK modulation and demodulation are usually based on logical selection of the difference phase before modulation and the recovery sum phase after detection. Here, we describe an analogue procedure done directly on the PSK’d I-F. BAW delay elements are used in arrangements of feed-forward for difference modulation and of feedback for demodulation. Characteristics are described, and results of laboratory implementation tests for data rate and carrier frequency variations are given. An I-F of 60 MHz and a bit rate of 200 kHz were used as nominal values. Robust performance is indicated.
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Victory, Charles W. "Soft decision diversity coded DS/DPSK systems in pulse-jammed multipath-fading channels." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1999. http://handle.dtic.mil/100.2/ADA361319.
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Dissertation (Ph.D. in Electrical Engineering) Naval Postgraduate School, March 1999."March 1999". Dissertation supervisor(s): Charles W. Therrien, Tri T. Ha. Includes bibliographical references (p. 175-177). Also available online.
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Jakubek, David Andrew. "Coherent/noncoherent detection of coherent optical heterodyne DPSK-CDMA and MFSK-CDMA signals." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/28033.
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Deb, Nebras. "A Novel Remodulation Scheme for WDM PONs Using DPSK for Both Downstream and Upstream." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/22847.
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Wavelength Division Multiplexing Passive Optical Networks (WDM PONs) offer a great solution to satisfy the increasing demand of bandwidth. In addition, it offers a higher level of data security through virtual point to point connections. A great challenge in realizing cost-effective WDM PON is the need for a transmitter at each Optical Network Unit (ONU) with a dedicated wavelength, which overloads the total cost of the system, in addition to reducing the number of available wavelengths in the system. Remodulation scheme is an ultimate solution for these problems of WDM PONs as the downstream signal itself is remodulated with upstream data which saves the need for a laser source at the ONU side. In this thesis I propose and experimentally demonstrate a novel wavelength remodulation scheme for WDM PONs that employs Differential Phase Shift Keying (DPSK) for downstream and Return to Zero DPSK (RZ-DPSK) for upstream. The use of DPSK enhanced the system with improved receiver sensitivity and RZ-DPSK improved the tolerance toward chromatic dispersion. In addition, I investigate the Backreflection (BR) penalty resulting from beat noise of BRs with upstream signal in a bidirectional WDM PON system that uses remodulation and phase modulation as a modulation format. I experimentally demonstrate the optimal conditions to operate the system and minimize the BR penalty.
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Ong, Choon Kwee. "Performance analysis of DPSK signals with selection combing and convolutional coding in fading channel." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1998. http://handle.dtic.mil/100.2/ADA344673.
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Thesis (M.S. in Electrical Engineering) Naval Postgraduate School, June 1998."June 1998." Thesis advisor(s): Tri T. Ha, Ralph D. Hippenstiel. Only one copy of this Thesis was sent, still waiting for second copy. Includes bibliographical references (p. 55-56). Also available online.
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Sendogan, Maruf. "Performance analysis of noncoherent DPSK with various diversity combining techniques over a Rician fading channel." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1998. http://handle.dtic.mil/100.2/ADA344647.
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Thesis (M.S. in Electrical Engineering) Naval Postgraduate School, June 1998.Thesis advisor(s): Tri T. Ha, Ralph D. Hippenstiel. "June 1998." Includes bibliographical references (p. 65-66). Also available online.
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Ambardekar, Aditya. "Analysis of BER in optical direct detection DPSK system in the presence of SPM and chromatic dispersion." abstract and full text PDF (UNR users only), 2008. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1460745.
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Roosen, Runge Cristhof 1971. "Codigos de bloco de modulação M-DPSK com uso de CSI para um canal de desvanecimento rayleigh." [s.n.], 1997. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259246.
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Orientador: Jaime PortugheisDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
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Resumo: Este trabalho estuda a construção de códigos de bloco de modulação M-DPSK, com detecção multi-simbolica e presença de informação de estado de canal (CSI), para canais com desvanecimento Rayleigh. Através de uma nova interpretação do fator de Chemoff, critérios para construção de códigos são sugeridos. Estes critérios coincidem com aqueles obtidos para o modelo de canal sem CSI. Um algoritmo de procura de códigos curtos é implementado. Resultados de simulação para os códigos encontrados comprovam a importância da otimização dos parâmetros de projeto sugeridos
Abstract: This work studies the construction of block codes for M-DPSK modulation with multi-symbol detection and the use of channel state information (CSI) in a Rayleigh fading channel. Based on a new interpretation of the Chemoff bound, criteria for codes construction are suggested. This criteria coincides with those obtained for the channel model without the use of CSI. A search algorithm for short block codes generation is implemented. Simulation results for the obtained codes confirm the importance of the suggested design parameters
Mestrado
Mestre em Engenharia Elétrica
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Santis, Victor Di. "Simulação e análise dos efeitos da cintilação ionosférica em um receptor de GPS utilizando a modulação DPSK." Instituto Tecnológico de Aeronáutica, 2013. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=3403.
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A cintilação ionosférica causa variações rápidas de amplitude e fase em sinais de rádio que atravessam a ionosfera devido às irregularidades em sua densidade. A cintilação pode degradar o sinal de GPS (Global Positioning System), em alguns casos este sinal pode ser totalmente atenuado. O emprego de sistemas que utilizam o GPS na aviação é realidade, novas tecnologias e formas de navegação que utilizam GPS estão em desenvolvimento. Neste contexto, é importante compreender o comportamento dos receptores quando submetidos à cintilação ionosférica e aplicar métodos que possam melhorar sua eficiência. Receptores de GPS utilizam a demodulação PSK coerente com sincronismo de portadora, quando os sinais de GPS são submetidos aos efeitos da cintilação ionosférica o receptor pode perder o sincronismo referente a um dado satélite e desta forma diminuir a precisão da sua posição. Na literatura foi demonstrado que a modulação PSK (Phase Shift Key) poderia ser demodulada diferencialmente utilizando bits conhecidos para referência, esta técnica apresenta um melhor desempenho para sinais que operaram sobre os efeitos de desvanecimento do tipo Rayleigh quando comparado à demodulação coerente. A presente dissertação apresenta um estudo de caso sobre os efeitos da cintilação ionosférica em um sistema simulado que utiliza a modulação DPSK. Para atingir o objetivo proposto foram criados dois ambientes de simulação, um integrado e um simplificado em MATLAB, estes ambientes foram construídos com os seguintes modelos: geração do sinal de GPS, rastreamento do sinal de navegação do GPS, geração sintética da cintilação ionosférica e adaptações para o emprego da modulação diferencial.
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Serbay, Murat. "Multilevel modulation formats for optical communication systems based on direct detection." Aachen Shaker, 2008. http://d-nb.info/991204263/04.
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Boivin, David. "Optical phase-modulated systems: numerical estimation and experimental measurement of phase jitter." Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-11072006-110448/.
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Thesis (Ph. D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2007.Bennett, Gisele, Committee Member ; Rhodes, William, Committee Member ; McLaughlin, Steven, Committee Member ; Barry, John, Committee Co-Chair ; Chang, Gee-Kung, Committee Chair ; Chapman, Michael, Committee Member.
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Siegrist, Michael. "Aufwandsgünstige Verfahren zur Vorcodierung bei nichtlinearen Übertragungssystemen." Aachen Shaker, 2009. http://d-nb.info/998764582/04.
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Chaouch, Hacène Mahieddine. "Advanced Modulation Formats and All-Optical Processing Solutions for Future Fiber-Optic Communication Systems." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/202987.
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In this dissertation we present the research findings around two important hot topics of modern and future fiber-optic communication systems: 100 Gbit/s transmission and alloptical processing of received phase-modulated signals. The findings are discussed in the same chronological order they were obtained. Each topic is summarized in two chapters that correspond to one selected journal and one conference publications. The first and second chapters are dedicated to the simulation and numerical analysis of 100 Gbit/s systems. In chapter one, we present a thorough investigation of the best 100 Gbit/s serial modulation format. Seven different modulation formats are considered and are compared in terms of tolerance to dispersion and maximum reach for a 10⁻⁹ bit error rate target. In chapter two, the behavior of chapter one’s best candidate is analyzed in a realistic environment. The influence of the existing lower data rate neighboring channels is discussed in particular. The results of these two chapters were obtained in collaboration with engineers from the Deutsche Telekom Technology Center in Darmstadt, Germany. They served as a theoretical basis for a field trial carried out by this same company. Chapter three and four focus on the use of semiconductor optical amplifiers for all-optical processing applications. Impaired phased-modulated signals are under particular interest in this study. The novelty in this work resides in the counter-propagating configuration that the semiconductor optical amplifier is operated in. In chapter three we give a detailed description of the experimental results. The complete setup is explained and the improvement in Q-factor and bit error rate for the received signal is proven. Furthermore, two novel concepts (Photonic Balancing and Saturated Asymmetric Filtering) that explain the observed improvements are developed and discussed for the first time to the best of our knowledge. Finally, chapter four aims at optimizing numerically the experimental setup for the saturated asymmetric filtering technique. The required detuned filter after the saturated semiconductor optical amplifier is optimized in terms of both off set and bandwidth.
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Ceragioli, Fulvio. "Análise comparativa de formatos de modulação OOK, DPSK e DQPSK para sistemas de fibras ópticas operando a taxas de 40 Gb/s." Universidade Presbiteriana Mackenzie, 2009. http://tede.mackenzie.br/jspui/handle/tede/1500.
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Study about
Estudo sobre
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Galdino, Lídia 1982. "Uma contribuição ao estudo de conversores/regeneradores totalmente ópticos de sinais OOK-OCDMA e DPSK-DB-OCDMA usando a técnica da mistura de quatro ondas." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260717.
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Orientadores: Edson Moschim, Luiz Henrique Bonani do NascimentoTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
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Resumo: A exigência crescente de se atingir maiores taxas de bits para satisfazer a demanda por largura de banda na internet tem motivado a investigação de dispositivos totalmente ópticos que viabilizem o desenvolvimento de redes ópticas transparentes (TON). O intuito dessas redes é manter o fluxo de dados sempre no domínio óptico, eliminando o gargalo no processamento das conversões óptico-elétricas e eletro-ópticas existentes nos atuais sistemas de comunicações ópticas. Neste trabalho foram investigadas, por meio de experimentos e simulações computacionais, técnicas de processamento óptico de sinais. Estas técnicas utilizam o fenômeno da mistura de quatro ondas (FWM) para multiplexar as informações de dois sinais em um único sinal. Em especial, foram investigadas duas novas técnicas para codificação e regeneração totalmente óptica do sinal não coerente de multiplexação por divisão de códigos ópticos no acesso (OCDMA). Estas técnicas convertem e regeneram no domínio totalmente óptico o sinal modulado em intensidade on-off keying (OOK) e o sinal modulado pelo chaveamento por desvio de fase diferencial (DPSK) no sinal OCDMA. Os resultados obtidos comprovaram que ambas as técnicas propostas funcionam corretamente. O sinal de saída OCDMA apresentou ganho na potência de regeneração de 1,69 dB em relação ao sinal de entrada OOK ou DPSK. A aplicação das técnicas de conversão e regeneração totalmente ópticas propostas, deu origem ao estudo da tecnologia híbrida de multiplexação por divisão de comprimentos de onda com a multiplexação por divisão de códigos ópticos (WDM/OCDM) na camada de transporte de uma rede TON. Heurísticas para atribuição de códigos ópticos e comprimentos de onda, bem como arquiteturas de conversão de códigos ópticos e comprimentos de onda foram propostas. Dos resultados, comprovou-se que a heurística Random-Random apresenta um melhor desempenho quando analisada a probabilidade de bloqueio. Ainda, a arquitetura de conversão esparsa parcial de códigos ópticos e comprimentos de onda (SPOCC/SPWC) melhora a utilização de recursos de rede, diminuindo o custo de implementação da rede
Abstract: The growing demand to achieve higher bit rates to satisfy the bandwidth in the internet has motivated the investigation of all optical devices that enable the development of transparent optical networks (TON). The idea is that the data stream always remains in the optical domain, eliminating the bottleneck in the processing of electro-optical conversion that existing in current optical communication systems. In this work new all-optical signal processing techniques are investigated through computer simulations and experiments. These techniques utilize the four wave mixing effect to multiplex information of two input signals into a single one. In particular, two new all-optical techniques for coding and regeneration incoherently optical code division multiple access (OCDMA) signals were investigated. These all optical techniques convert and regenerate the optical signal modulated in intensity, on-off keying (OOK) and / or the optical signal modulated in differential phase shift (DPSK) on OCDMA signal. The results showed that both techniques worked properly. The output OCDMA signal presented an improved in the optical power regeneration of 1,69 dB. The application of all optical conversion technique with simultaneous signals regeneration led to the study of hybrid wavelength division multiplexing with optical code division multiplexing (WDM/OCDM) technology at the transport layer in a TON network. Heuristics for assigning optical codes and wavelengths as well as optical codes and wavelengths conversion architectures were proposed. From the results, it was shown that Random-Random heuristic has a better performance when analyzing the blocking probability. Still, the sparse partial optical code and wavelength conversion (SPOCC/SPWC) architecture improves the utilization of network resources, reducing the deployment cost of network
Doutorado
Telecomunicações e Telemática
Doutor em Engenharia Elétrica
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Carvalho, Sidney Franco de. "Prova dinâmica super pesada - DPSH." reponame:Repositório Institucional da UFSC, 2017. https://repositorio.ufsc.br/xmlui/handle/123456789/178986.
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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Civil, Florianópolis, 2017.Made available in DSpace on 2017-09-05T04:12:43Z (GMT). No. of bitstreams: 1 348641.pdf: 7419922 bytes, checksum: c0ae1ffe6a86b2bfbf5a16b8db7c0c5f (MD5) Previous issue date: 2017
O ensaio DPSH - Prova Dinâmica Super Pesada está padronizado internacionalmente pela "Referência Internacional para Procedimentos de Ensaio para Sondagem Dinâmica-DP" (ISSMFE 1989), pela Norma Alemã DIN 4094-3: 2002 e mais recentemente pela Norma da ISO ? 22476-2:2005. Esta última norma apresenta quatro tipos de penetrômetros dinâmicos (leve-DPL, médio-DPM, pesado-DPH e super pesado-DPSH), variando principalmente a massa do martelo e a altura de queda. Por contar com uma norma internacional da International Standartization Organization (ISO), do qual o Brasil é signatário, conforme orienta o Instituto Brasileiro de Normas Técnicas (INMETRO), os ensaios dinâmicos passaram a ter uso regular no Brasil, o que difundirá as pesquisas para esses ensaios. Os ensaios da atual família DP?s (Provas Dinâmicas), há muito fazem parte da comunidade geotécnica de todo mundo. No Brasil e no mundo há vasta literatura onde se registra a participação do ensaio Dynamic Probing Light (DPL) quando correlacionado com o ensaio Standard Penetration Test (SPT) ou com o Cone Penetration Test (CPT). A presença do DPSH é muito comum na Europa e no Continente Africano, mas ainda pouco difundido no Brasil. Por outro lado, não existem correlações apropriadas e validadas no Brasil. O local do estudo escolhido foi a zona urbana do Município de Joinville/SC/Brasil. O presente estudo tem como objetivo analisar as correlações existentes entre o ensaio SPT e DPSH onde, primeiramente, procurou-se analisar os resultados dos seus índices numéricos sob a ótica global. A partir da elaboração de mapas geológicos e geotécnicos, avaliou-se os seus resultados sob a ótica da interferência de duas unidades geotécnicas mais presentes, assim como a consideração da saturação do solo, visto que a região de estudo possui o lençol freático elevado. A justificativa para o desenvolvimento do trabalho é o fato de que, dentre os membros da família DP?s, o DPSH é o que mais se aproxima, energeticamente, do SPT, além de possuir o mesmo princípio dinâmico de execução, mesmas condições de alcance de profundidade, vantagem de possuir disparo automático do martelo, contar com a alta produtividade em campo com reduzida interferência operacional e custos de execução menores. A partir das análises, observa-se forte correlação entre seus índices de resistências dinâmica, o que indica que a proposta é válida e poderá ser mais aprofundada em trabalhos futuros, onde outras variáveis poderão ser conjuntamente testadas.
Abstract : The DPSH test - Dynamic Penetrometer Super Heavy, is internationally standardized by the "International Reference Test Procedures for Probing Dynamic-DP" (ISSMFE 1989), the German standard DIN 4094-3: 2002 and more recently by ISO Standard - 22476- 2: 2005. The latter standard has four types of dynamic penetrometer (light-DPL, medium-DPM, DPH-heavy and heavy-DPSH super), mainly by varying the hammer weight and drop height. By relying on an international standard of the International Standardization Organization (ISO), of which Brazil is a signatory, as orients the Brazilian Institute of Technical Standards (INMETRO), passes the dynamic tests have regular use in Brazil, which disseminate research for these assays. The tests of the current family's DP (Dynamic tests) have long been part of the geotechnical community worldwide, as it was from its evolution than the other dynamic and static tests also emerged. In Brazil and in the world there is a vast literature which records the participation of Dynamic Probing Light test (DPL) when correlated with the Standard Penetration Test (SPT) or Cone Penetration Test (CPT). As for the DPSH, his presence is very common in Europe and South Africa, but still little used and widespread in our the country. On the other hand, there are no appropriate correlations and validated in Brazil, and so to be, this work will try to propose a correlation between these two tests. The site chosen study was the urban area of the City of Joinville / SC / Brazil. This study aims to analyze the correlation between SPT and DPSH test whereprimarily, we tried to analyze the results of their numerical indices in the global perspective. Then provided with the development of geological and geotechnical maps, we evaluated the results from the perspective of interference two more present geotechnical units, as well as consideration of soil saturation, since the region has a high water table. The justification for the development of the work is the fact that among the members of DP's family the DPSH is what is closest energy SPT, besides having the same dynamic principle of execution, the same depth range of conditions, advantage of having automatic firing hammer, count on high productivity, with reduced operational interference and lower running costs. As a result of comparisons studied through the use of statistics obtained strong correlation between their levels of dynamic resistance, which indicates that the proposal is valid and may be more detailed in future work where other variables may be jointly tested and studied its effects.
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Šabart, Otto. "Testování Open vSwitch a DPDK." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2017. http://www.nusl.cz/ntk/nusl-363892.
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The project is about the virtual switch called Open vSwitch and its architecture. It deals with an acceleration of the switch mainly by using Data Plane Development Kit (DPDK). Furthermore, it describes the architecture of the DPDK kit and analyses the individual functional units. Furthermore, it describes the architecture of the DPDK kit, analyses the individual functional units and describes the possibilities of its configuration. Another part of the project describes the methodology chosen for a performance testing of virtual switches. Subsequently, this methodology was used to make a design and environment implementation for fully automatic Open vSwitch s DPDK performance testing with the use of automatic systems such as Koji, Jenkins, Beaker a VSperf. Simultaneously, the tools for automatic comparison of produced results were implemented. The created environment was then used for the performance measurement of several basic Open vSwitch configurations with and without the use of DPDK. The implemented measurements are discussed and evaluated in the project. The final project's stage provides a great amount of the enlargement and improvement of the implemented tests.
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Doležal, Pavel. "Rozšíření aplikace DPDK DNS Probe." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2019. http://www.nusl.cz/ntk/nusl-399183.
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This master's thesis is focused on extension of the DPDK DNS Probe application that monitors DNS traffic in high speed networks. It presents framework DPDK, which can be used for fast packet processing. General architecture of the DNS system is described as well as details of its components. Basic principles of transport protocol TCP are described. It introduces an effective design and implementation of DNS packet parsing to optimize DPDK DNS Probe's performance. It also introduces a design and implementation of processing DNS messages sent over TCP for export of traffic statistics. The application's performance was tested using a high speed traffic generator Spirent.
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Procházka, Aleš. "Zpracování paketů pomocí knihovny DPDK." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2019. http://www.nusl.cz/ntk/nusl-399187.
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This master thesis focuses on filtering and forwarding packets in high speed networks. Firstly the DPDK framework is introduced, which is used for fast packet processing. This project also introduces a design of application for high-speed packet filtering and design of tools for making it easier to work with that application. Subsequently, the implementation of this design is introduced and testing with comparison of results with a standard firewall
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Schmidt, Zachary Wayne, and Zachary Wayne Schmidt. "Characterizing Concealed-Question DPS." Thesis, The University of Arizona, 2017. http://hdl.handle.net/10150/625147.
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Concealed questions (CQs) are DPs that function as embedded questions. Although
various attempts have been made to establish which DPs can and cannot be CQs, none
of these attempts has been completely successful. I argue that the constraints on CQ DPs
are the same as the constraints on subjects of embedded specificational wh- questions. I
show that one apparent exception, the requirement that a specificational subject be
topical, is a matter of felicity rather than grammaticality, but the existence of nontopical
CQs does offer insight into the structural difference between CQs and embedded
questions. I conclude by proposing that a CQ is a small clause whose predicative DP has
risen into the matrix clause to produce a specificational structure.
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Blazevic, Denis Ivan, and Magnus Jansson. "Improving the flexibility of DPDK Service Cores." Thesis, Linköpings universitet, Interaktiva och kognitiva system, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-157631.
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Data Plane Development Kit is a highly used library for creating network applications that can be run on all hardware. Data Plane Development Kit has a component called Service Cores, which allows the main applications to create services that will run independently. These services are manually mapped to specific CPU cores, and are scheduled in a round-robin method. Because of the manual mapping, and the scheduling, the different load for each service can impact the start time for each service. By having services not run when supposed to, the throughput will degrade. In this thesis, we investigate and try to solve the issue by implementing a basic load balancer into the Service Core component. Our results show that an basic load balancer, that will balance upon reaching a CPU upper threshold, will increase the throughput of services while decreasing the delay between each service run.
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Nam, Chanhyun. "Beijing and the 1961 PRC-DPRK security treaty." Thesis, Monterey, California. Naval Postgraduate School, 2010. http://hdl.handle.net/10945/5096.
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Approved for public release; distribution is unlimitedThis thesis addresses the continuation of PRC-North Korean alliance even though significant changes have emerged in international security environment. Numerous studies have focused on the decreased strategic value of North Korea with respect to Chinese national interests, but Pyongyang still serves as stepping stone for China to expand its leverage. China's national objectives of maintaining its leverage in Northeast Asia indicates that Beijing will maintain the 1961 alliance to assure its security interests. By examining the formation of PRC-DPRK alliance, this thesis assesses the characteristics of their alliance and analyzes the evolution in Beijing's approach to Pyongyang by explaining how transitions in the security environment have affected their alliance. This thesis concludes that, for China, the rationale for maintaining the PRC-DPRK alliance is to guarantee China's national interests, not to sustain its traditional "sealed in blood" relationship.
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Kolář, Radek. "Implementace nástrojů vizualizace pro osazování DPS." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-241967.
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Familiarization with the problems of PCB assembly and commissioning means for interim and final control of DPS on semi-automatic and manual assembly. Analysis tools for visualizing programs during PCB assembly. Defining the pluses and minuses of each program. Introducing the functioning of the program selected for visualization. Implementation of the program into production. Problems with introducing the program and compared with the previous situation. Evaluation of its contribution to manufacturing (time, quality, financial costs, human resources, ...). Solving problems encountered with the implementation of the program. Recommendations for the type of production the program is suitable.
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Tylich, Ondřej. "Elektromigrace tavidlových zbytků na povrchu DPS." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242134.
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Diploma thesis introduces the problems of electromigration, fluxes and flux residues. It includes a proposal for methods of measuring surface insulation resistance, information about selected types of fluxes and conformal coatings. It focuses on the influence of temperature, humidity. There are applied conductometric method and method of measuring SIR by IPC-25-B. The thesis describes the practical measurement of SIR and ionic contamination of PCB covered with flux and influence of RH, temperature and applied voltage is evaluated and discussed.
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Blahút, Jozef. "Automatická expoziční jednotka pro výrobu DPS." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318637.
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This diploma thesis deals with the issue of fast high-quality prototype production of printed circuit boards for the needs of the mechatronics lab. Within the scope of this thesis a prototype machine was proposed and created together with control software, which by the help of DLP projector and two stage axis allows to produce printed circuit board in relatively short period of time.
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Khamooshi, H. "Heuristic network-based project scheduling : dynamic priority scheduling method; DPSM." Thesis, Lancaster University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267918.
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Silva, Gleyce Oliveira [UNESP]. "Efeitos do LRP6 e Frizzled6 na diferenciação endotelial de DPSC." Universidade Estadual Paulista (UNESP), 2015. http://hdl.handle.net/11449/136702.
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000860768.pdf: 1686526 bytes, checksum: 979e2944f4a6b89a46fd9bb6b0302204 (MD5)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
O objetivo deste estudo foi avaliar a função da via de sinalização Wnt/β- catenina através dos receptores LRP6 e Frizzled6 na diferenciação de células-tronco de polpa dental de dentes permanentes (DPSC) em células endoteliais. DPSC foram transduzidas com marcadores eGFP e vetores lentivirais shRNA (LRP6, Frizzled6 ou vetor vazio - controle) para os experimentos. Os testes in vitro avaliaram a expressão de GSK3-β e β- catenina por western blot na presença de rhWnt1 e rhVEGF165 e de VEGF e CXCL-8 (IL-8) por ELISA. A expressão de marcadores endoteliais (western blot e PCR) e formação de túbulos capilares foram analisados após a diferenciação endotelial das DPSCs. In vivo, fatias dentárias/matrizes condutivas semeadas com DPSCs-shRNA foram implantadas em subcutâneo de dorso de camundongos imunodeprimidos por 28 dias e o número de vasos sanguíneos foi determinado por imunohistoquímica para eGFP e coloração por HE. β-catenina ativa foi mais expressa em shRNA-LRP6 e shRNA-Frizzled6 que nas células controle, e sua expressão aumentou com a suplementação com rhVEGF165 e rhWnt1. A expressão de GSK3-β fosforilado foi menor, porém também aumenta ou permanece estável com rhVEGF165 ou rhWnt1. Quanto à expressão de VEGF, em shRNA-Frizzled6 foi maior que nas células controle e em shRNA-LRP6 (p<0,05), enquanto que a expressão de IL8 foi menor em shRNA-LRP6, diferindo estatisticamente das outras células. A expressão dos marcadores endoteliais CD31 e VEGFR2 diminuiu nas células shRNA-LRP6, enquanto que em shRNAFrizzled6 a expressão de VEGFR2 foi aumentada. A formação de túbulos capilares de shRNA-Frizzled6 e shRNA-LRP6 foi menor quando comparado ao controle, porém shRNA-Frizzled6 obteve uma tendência de aumento na proliferação de capilares em 144h. In vivo, DPSC-shRNALRP6 apresentou menor número de capilares formados quando comparados com as outras duas...
The aim of this study was to evaluate the function of Wnt/β-catenin signaling through LRP-6 and Frizzled-6 receptors in the differentiation of dental pulp stem cells from permanent teeth (DPSC) into endothelial cells. DPSC were transduced with EGFP-tagged lentiviral shRNA vectors (LRP6, Frizzled6 or empty vector - control) for experiments. In vitro assay evaluated GSK3-β and β-catenin expression by western blot in rhWnt1 and rhVEGF165 presence, and VEGF and CXCL-8 (IL-8) expression by ELISA. Endothelial markers expression (western blot and PCR) and tube formation were analyzed after endothelial differentiation of DPSCs. In vivo, tooth slices/scaffolds seeded with transduced DPSCs were implanted subcutaneously in back of immunodefficient mice and blood vessels were counted per immunohistochemistry for eGFP and HE staining. Active β- catenin was more expressed in shRNA-LRP6 and shRNA-Frizzled6 than in control cells, and increased with rhVEGF165 and rhWnt1 supplementation. Phosphorylated GSK3-β expression was lower, however also increased or maintained with rhVEGF165 or rhWnt1. VEGF expression was higher in shRNA-Frizzled6 than in control and shRNA-LRP6 (p<0,05), IL8 expression was lower in shRNA-LRP6, with statistically difference of the others cells. Endothelial markers CD31 and VEGFR2 expression decreased in shRNA-LRP6, but VEGFR2 expression increased in shRNAFrizzled6. shRNA-Frizzled6 and shRNA-LRP6 tube formation was lower when compared to control, however shRNA-Frizzled6 had tendency to increase proliferation in 144h. In vivo, shRNA-LRP6 showed fewer blood vessels formed than other cells (p<0,05). Collectively, the results of this study suggest that Wnt/β-catenin signaling regulates endothelial differentiation of DPSC through LRP6
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Springborn, Matthias. "Das literarische Vermächtnis jüdischer DPs: Eine Doppelrezension." HATiKVA e.V. – Die Hoffnung Bildungs- und Begegnungsstätte für Jüdische Geschichte und Kultur Sachsen, 2016. https://slub.qucosa.de/id/qucosa%3A34813.
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Mlýnek, Martin. "Analýza závad na DPS pomocí X-RAY." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221093.
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This thesis is focused on BGA packages and fault detection after rework using X – Ray. There is a description of BGA packages by carrier substrate, techniques of connecting on chip, from mounting packages to repair printed circuit boards (hereafter PCB). Thesis summarizes description of defects, which are created after rework process. There is also description of X – Ray as method for analyzing defects. X – PLANE method used to detect internal structure of BGA packages and it was confirmed by microsection and by software for reconstruction. Description of automatic and manual measurement is follow.
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Buřival, Tomáš. "Opravy DPS s BGA a FC pouzdry." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217906.
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Graduation thesis is specialized on dilemma of the integrated circuits with ball grid array. Chapter two describes several types of packages and confrontation of their characteristics. Chapter three considers possibilities of corrections these boards bedded with packages, mounting and demounting of these packages, method of camera control and also inspection of the soldering process. Chapter four attend to practical measuring of thermal profiles and their optimalization.
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Gerják, Rastislav. "Návrh a konstrukce CNC routeru pro DPS." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-319566.
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In mechanical industry, both additive and subtractive manufacturing methods are controlled by instructions in G-code, making it possible to utilize both technologies in one modular device. Main objective is to design, construct, and calibrate multipurpose machine based on RepRap 3D printer, which will be able to use attached spindle to precisely mill light materials. Particular emphasis is given to ability to carve a pattern and drill holes in plated substrate in order to create functional PCB by incision.
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Naab-Levy, Adam O. "Enhanced Distance Measuring Equipment Data Broadcast Design, Analysis, Implementation, and Flight-Test Validation." Ohio University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1449158180.
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Floripi, Simone Azevedo. "Argumentos nulos dentro de DPs em portugues brasileiro." [s.n.], 2003. http://repositorio.unicamp.br/jspui/handle/REPOSIP/270803.
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Orientador: Jairo Morais NunesDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Estudos da Linguagem
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Resumo: Esta dissertação analisa as características de uma categoria vazia em estruturas possessivas do Português Brasileiro, utilizando o contexto de DP com nomes relacionais, Le., nomes que selecionam outros nomes como argumentos e expressam uma relação de parentesco ou amizade. A análise dessa dissertação está baseada na teoria de Princípios e Parâmetros de Chomsky (1981, 1986) na sua versão mais atualizada, conhecida como Programa Minimalista (Chomsky 1995). Na teoria de Regência e Ligação, a aplicação do Critério Temático nos IÚveis de representação sintática impedia o movimento para posições temáticas. Porém, alguns estudos baseados no Programa Minimalista, como Nunes (1995), Hornstein (1999) e Ferreira (2001), demonstraram ser possível a realização desse movimento ao considerar que papéis temáticos são traços, capazes de licenciar movimento. Dessa maneira, a hipótese defendida por esta dissertação considera o licenciamento do movimento (Copiar e Concatenar) de um DP em estruturas possessivas para uma posição temática, como visualizado no exemplo abaixo. (i) Eva telefonou para a mãe e Para o desenvolvimento deste trabalho, foram utilizadas algumas restrições de movimento (d. Ferreira 2001 e Rodrigues 2001), com o intuito de verificar se tais restrições se aplicariam nas construções relevantes para a minha análise (estruturas com o DP possuidor de uma cv ligada a um nome relacional). Como resultado, observei que esta cv não apresentou comportamento de pronome, o que confirmou minha hipótese de estar lidando com um vestígio de movimento. Já em contexto de impedimento de movimento, me baseei na proposta "de Aoun, Choueiri e Hornstein (2001) sobre um fenômeno apresentado em Libanês. De acordo com os dados encontrados em contexto de ilha, procuro demonstrar que o elemento localizado no DP com nome relacional da oração subordinada apresenta características de um elemento pronominal (um tipo de pronome resumptivo), licenciado por questões de economia devido à configuração de bloqueio para movimento
Abstract: This thesis analyzes the characteristics of an empty category in possessive structures in Brazilian Portuguese, using the context of DPs with relational nouns, i.e., nouns that select other nouns as arguments and express a family or friendship relationship. The analysis in this thesis is based on the PrincipIes and Parameters theory of Chomsky (1981, 1986) in its more current version, known as the Minimalist Program (Chomsky 1995). In the Govemment and Binding theory, applying the Theta Criterion at the syntactic levels of representation banned movement to e-positions. However, some studies based on the Minimalist Program, such as Nunes (1995), Hornstein (1999), and Ferreira (2001), have shown that this movement is possible by considering that e-roles are features, capable of licensing movement. Thus, the hypothesis argued for in this thesis considers licensing of movêment (Copy and Merge) of a DP in possessive structures to a G-position, as shown in the example below. (i) Eva telefonou para a mãe e Eva telephoned to the mother e 'Eva called her mother.' For this study, I have used some restrictions on movement (d. Ferreira 2001 and Rodrigues 2001), with the intention of verifying if such restrictions would apply to the structures relevant for my analysis (the DP possessor of an empty category linked to a relational noun). The result was that this empty category did not show the behavior of a pronoun, which confirmed my hypothesis that it was actually a trace of movement. As for contexts that block movement, I used a proposal by Aoun, Choueiri, and Hornstein (2001) about a phenomenon in Lebanese. According to the data concerning islands, I demonstrate that the element in the DP with a relational noun of the embedded clause shows characteristics of a pronominal element (a kind of resumptive pronoun), licensed for reasons of economy because of the movement blocking configuration
Mestrado
Linguistica
Mestre em Linguística
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Minář, Jan. "Kvalita povrchových úprav DPS a optimalizace testovacího kupónu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377120.
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This master’s thesis deals with measuring and evaluation of wetting for samples of different surface finishes, using a test coupon developed in cooperation with firm Gatema. It deals with surface finishes ENIG and immersion tin. For these samples deals with quality monitoring and periodic testing of these surface finishes. The solder using for tests is SAC305. Test methods are used for simulation of reflow soldering and wave soldering.
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Magnus, Lindsay Gerald. "Expanding the capabilities of the DPS lonosonde system." Thesis, Rhodes University, 2001. http://hdl.handle.net/10962/d1018243.
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The Digisonde Portable Sounder (DPS) is a low power pulse ionosonde capable of recording a wealth of scientific information about the ionosphere. The routine vertical incidence mode, that produces the scaled ionospheric parameters, only records limited Doppler and no precise angle of arrival (AoA) information. The drift mode produces precise scientific information but only limited range information. This thesis explains the operation of the DPS and then examines the drift data by first showing the Doppler velocities (V*) calculated for a fixed frequency ionogram as well as the velocities calculated from an interesting ionospheric disturbance measured with a stepped frequency ionogram and second by illustrating the presence of a variation in the AoA of ionospheric echoes at sunrise. The conclusion of the thesis is that a drift vertical incidence mode be developed to allow the simultaneous measurement of the scaled ionospheric parameters and the precise AoA and full Doppler spectrum information.
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Pereira, Joana Fernandes Alberto Wilton. "Electrochemical characterization of Dps, a DNA-protecting protein." Master's thesis, Faculdade de Ciências e Tecnologia, 2011. http://hdl.handle.net/10362/7820.
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Dissertação para obtenção do Grau de Mestre em
BiotecnologiaThe objectives of the present work were the purification and electrochemical characterization of Dps and study its iron incorporation mechanism in the presence of hydrogen peroxide. A bacterial miniferritin (Dps) from Pseudomonas (Ps.) nautica 617 was expressed in BL21(DE3) E. coli cells transformed with pET21c(+)-1dps plasmid vector. Protein overexpression was performed in nutritionally rich LB medium containing 100 μg/mL ampicillin. Recombinant Dps was purified through a two-step process: weak ionic exchange chromatography (DEAE Sepharose Fast Flow XK 26/40 resin) and strong ionic exchange chromatography (Q Resource resin). Protein concentration was determined through UV/Visible spectroscopy. The electrochemical study was performed through cyclic voltammetry, square wave voltammetry and chronoamperometry; Dps was either in solution or adsorbed to the working electrode. The chosen supporting electrolyte was 200 mM MOPS pH 7.1 buffer with 200 mM NaCl. Electrochemical assays were performed in aerobic and anaerobic environment and in the presence of Dps and Fe(II) and H2O2, both of Dps co-substrates. For the different assays, working electrodes made of gold, glassy carbon and graphite were used with different results and conclusions. The iron incorporation in the ferroxidase centers and mineral core formation were studied. Assay results were obtained through direct electron transfer. Among the observed results, iron oxidation during protein incubation and oxygen production during the catalytic mechanism were observed. DNA-Dps interaction results were inconclusive, although some unconfirmed evidence exists of DNA protection by Dps from electrochemical oxidation.
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Alnuaimi, Nasser Abdullah. "Modeling ultrasonic transducer in homogeneous and non-homogeneous media using DPSM method." Diss., The University of Arizona, 2004. http://hdl.handle.net/10150/280583.
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Modeling ultrasonic transducers is an important aspect of research in nondestructive evaluation and testing. In most nondestructive evaluation applications, the ultrasonic transducers are traditionally modeled as: (1) point sources generating spherical wave fronts (2) line sources generating cylindrical wave fronts, or (3) planar surfaces generating plane wave fronts. In reality, the transducer front face has finite dimensions; it is neither point source nor planar source because the ultrasound that emits from a piezoelectric transducer does not originate from a point or an infinite plane, but instead originates from the finite surface of the piezoelectric element with flat or curved front face. Analytically modeling the fields radiated by ultrasonic transducers is a very difficult task because of the large number of possible transducer types, sizes and configurations that are used in practice. In this study, a semi analytical technique the Distributed Point Source Method (DPSM) is adapted to model ultrasonic transducers. The DPSM discretizes the transducer surface into a finite number of elemental surfaces. As a result, the complexity associated with the discretization of the three-dimensional problem geometry as done in the finite element technique is reduced. In the DPSM technique, the fundamental governing equations for elastic wave propagation in a fluid and in a solid are solved. For this reason, the DPSM technique is called a semi-analytical technique. In this research, computer codes for computing the ultrasonic field in a three dimensional inhomogeneous medium in front of a transducer of finite dimension have been written in MatLab. Two different cases are considered in this study, nonhomogeneous fluid and fluid-solid interface. Both normal and inclined incidence cases are investigated. This investigation shows that DPSM is an efficient technique for modeling ultrasonic transducers in nonhomogeneous media.
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Pacheco-Olivella, Arsenio Andrew. "Synthesis, characterization, and reactivity with dioxygen, of Ru(OEP)(DPS)₂ and Ru(OEP)(DecMS)₂ [OEP= dianion of octaethylporphyrin; DPS= diphenylsulphide; DecMS= decylmethylsulphide]." Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/26020.
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The complexes Ru(OEP)(DPS)₂ (1) and Ru(OEP)(DecHS)₂ (2) were prepared in vacuo on a 100-mg scale by treatment of the dimeric species [Ru(OEP)]₂ (3) with a CH₂CI₂ solution containing a slight excess of the appropriate thioether [OEP= dianion of octaethylporphyrin; DPS= diphenylsulphide; DecMS= decylmethylsulphide]. In vacuo recrystallization, from n-heptane in the case of 1, and from n-pentane/methanol for 2, gave analytically pure material in 40 and 80 % yields, respectively. Both products were characterized by X-ray diffraction analysis, uv/vis absorption and nmr spectrometry, as well as elemental analysis.
Variable temperature nmr studies were carried out with both complexes. JL was found to be in thermodynamic equilibrium with 3, the dimer being favoured at about 80° C, and 1 at lower temperatures. Sharp nmr signals for the OEP protons of both equilibrating species, even at 80° C, indicated that exchange between them was slow on the nmr time scale; but, broadening and eventual coalescence at 80° C of the nmr signals for free and coordinated DPS suggested that the axial ligands of JL were quite labile. Cooling solutions of 2 caused the thioether methylene signals to broaden, and at -60° C the signals due to the methylenes closest to the sulphur split into broad doublets, this resulting from the prochiral nature of DecMS. The fact that only one nmr signal was observed for these methylene protons at room temperature implies rapid alternate coordination of the sulphur lone pairs.
The crystal structures of 1 and 2 revealed Ru-S bond lengths typical of Ru complexes containing trans-thioethers. The bond distances and angles of the porphyrin core were typical of those of monomeric Ru(Porp) complexes.
Dv/vis absorption, and nmr spectrometric studies, showed that 1 was extremely air-sensitive in solution, readily giving [Ru(OEP)OH]₂O and free DPS. Dv/vis absorption, nmr, and gc/mass spectrometric studies revealed that 2 reacted with dioxygen over a period of months to give Ru(OEP)(DecMS)(DecMSO) and Ru(OEP)(DecMSO)₂ as major products, as well as Ru(OEP)(CO)L (L= DecMS and DecMSO), and two other unidentified Ru(Porp) complexes as minor by-products [DecMSO= decylmethylsulphoxide].
In the presence of excess DecMS 2 catalyzed slow autoxidation of the free ligand to give DecMSO, DecMSO₂, and didecyldisulphide; the rate of this reaction was increased by addition of small quantities of HOAc [DecMSO₂ = decylmethyl-sulphone]. A major Ru(Porp) end-product both in the presence and absence of HOAc was Ru(OEP)(CO)L, the CO coming from Ru[sup II] (Porp)-mediated decarbonylation reactions.Science, Faculty of
Chemistry, Department of
Graduate
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Vala, Martin. "Analýza defektů na DPS za použití moderních optických metod." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-254482.
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This diploma thesis is focused on detecting of defects on BGA (Ball Grid Array) components using of X-ray. Defects are formed during reflow BGA components during assembly, but also later due to mechanical and thermal stress. Therefore, there is an overview of defects and methods of diagnosis of BGA packages eg .: modern X-ray defect detection or micro sections. There is disclosed a device NORDSON DAGE XD7600NT its operation and setup. The device enables advanced methods of scanning called X-plane. For creating 3D models used reconstructive software called CERA, which uses raw data from the method of X-Plane.
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Park, Hee-Eun. "Food Security in the DPRK Since the Great Famine of the Mid-1990s." Thesis, The George Washington University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10159055.
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Since the Great Famine of the mid-1990s, the the Democratic People’s Republic of Korea (DPRK) has experienced significant socioeconomic and political changes. Most importantly, the ways in which North Koreans produce, distribute, and consume food, which shed light on food security, has changed in a great deal. Scholars have sought to understand whether and how food security has improved and why the regime stayed in power despite predictions of its likely demise. The paper examines trends among indicators of food security—food availability and nutritional status in the DPRK—that show overall improvement, while acknowledging that the DPRK still suffers from food insecurity in absolute terms. This paper argues that three factors account for this improved food security: unexpected acceptance of international food assistance, marketization from below, and a series of government policies adjusting to marketization. Based on the analysis of the literature investigating the three factors and their effects, the paper claims that international food assistance was necessary for pulling the country out of the Famine, but food assistance alone did not explain improved food security in the longer term. The paper found that the combination of marketization and government policies was the primary contribution to improved food security. The paper deepens the understandings of policymakers on why the DPRK is not collapsing despite the ongoing food shortages. It also suggests a need for studies of food security to theorize the interaction between state policies and individual agency or coping behaviors.
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Hanquist, Carl-Henrik. "Airborne Radar Ground Clutter Suppression Using Multitaper Spectrum Estimation & Choosing DPSS Parameters." Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-71309.
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One of the biggest challenges in any airborne radar is to distinguish a target from a strong ground echo. The main problem is that the ground echo, called ground clutter, can be up to a million times stronger than the response from the target in question. Today many different filtering methods are used in airborne radar systems to separate the target signal from the ground clutter. All of them with their own advantages and shortcomings. In an ideal world the optimum filter would completely filter out the unwanted ground echo. But as ideal filters don't exist in reality a filter with low sidelobes and minimum loss in signal-to-interference ratio is sought after. A type of filter which exhibit this behaviour are discrete prolate spheroidal sequences (DPSS). This thesis investigated if DPSS could be used as weight functions in multitaper spectrum estimation to filter out ground clutter in the radar signal. A simple clutter model was developed for generating simulated ground clutter which was then filtered out by multitaper and a traditional method. Results showed that it is possible to use DPSS in multitaper spectrum estimation and that it outperforms a basic traditional method in clutter filtration as long as parameters such as bandwidth and the number of sequences used are chosen properly. The increase in performance against the traditional method comes at a cost of increased computational load with each additional DPSS order used. A full factorial experiment was also performed to investigate which parameters were important for maximising improvement factor and minimum detectable velocity. The results from these showed that a low bandwidth in the generation of the DPSS was preferable and that a high number of time samples and DPSS used improved performance. They also showed that for an increase in number of time samples the bandwidth and number of sequences used need to be adjusted to maintain the same level of the improvement factor. It was concluded that future work should focus on validation with more advanced clutter models and MTI filters in simulations as well as validation against real radar data. If proved successful, optimisation of calculation speeds as well as implementation of adaptive choice of DPSS bandwidth would be beneficial before being implemented in a radar system.En av de största utmaningarna i ett flygburet radarsystem är att urskilja ett mål från markekot. Problem uppstår eftersom markekot, kallat markklotter, kan vara upp emot en miljon gånger starkare än svaret från målet i fråga. I dagsläget används flera olika filtreringmetoder i flyburna radarsystem för att urskilja målet från markklottret, alla har sina fördelar och nackdelar. I en ideal värld skulle det optimala filtret filtrera ut markklottret fullständigt och endast bevara målsignalen. Eftersom dessa filter inte existerar i verkligheten eftersträvas istället ett filter med låga sidlober och minimal förlust i signal-till-interferens ration. En typ av filter som uppvisar detta beteende är diskreta prolata sfäroid sekvenser (DPSS). Denna uppsats undersöker ifall DPSS kan användas som viktfunktioner i multitaper spektralestimering för att filtrera ut markklotter i en radarsignal. En enkel klottermodell utvecklades för generering av simulerat markklotter som sedan filtrerades ut med multitaper metoden och en traditionell metod. Resultatet visade att det var möjligt att använda DPSS i multitaper spektralestimering och att metodens prestanda överstiger den traditionella meteoden, så länge parametrar som bandbredd och antal använda sekvenser väljs korrekt. Prestandaförbättringen mot den traditionella metoden uppstår mot en kostnad i beräkningstid som ökar med varje DPSS ordning som används. Ett full factorial experiment utfördes också för att undersöka vilka parametrar som hade störst påverkan för att maximera förbättringsfaktorn och minsta detekterbara hastighet. Resultated visade att låg bandbredd vid generering av DPSS var att föredra, samt att ett stort antal använda DPSS och tidssamples ökade prestandan. Resultaten visade också att för ett ökat antal tisdssamples så måste bandbredd och antal sekvenser som används justeras för att bibehålla samma nivå av förbättringsfaktorn. Slutligen rekommenderades det att framtida arbete borde fokusera på validering med mer avancerade klottermodeller och MTI filter i simuleringar, samt validering mot verklig radar data. Om detta visar sig framgångsrikt bör optimering av beräkningstid och implementation av ett adaptivt val av DPSS bandbredd göras före implementering i ett radarsystem.
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Fooladi, Samaneh, and Tribikram Kundu. "Application of distributed point source method (DPSM) to wave propagation in anisotropic media." SPIE-INT SOC OPTICAL ENGINEERING, 2017. http://hdl.handle.net/10150/625391.
Full textAbstract:
Distributed Point Source Method (DPSM) was developed by Placko and Kundu 1, as a technique for modeling electromagnetic and elastic wave propagation problems. DPSM has been used for modeling ultrasonic, electrostatic and electromagnetic fields scattered by defects and anomalies in a structure. The modeling of such scattered field helps to extract valuable information about the location and type of defects. Therefore, DPSM can be used as an effective tool for Non-Destructive Testing (NDT). Anisotropy adds to the complexity of the problem, both mathematically and computationally. Computation of the Green's function which is used as the fundamental solution in DPSM is considerably more challenging for anisotropic media, and it cannot be reduced to a closed-form solution as is done for isotropic materials. The purpose of this study is to investigate and implement DPSM for an anisotropic medium. While the mathematical formulation and the numerical algorithm will be considered for general anisotropic media, more emphasis will be placed on transversely isotropic materials in the numerical example presented in this paper. The unidirectional fiber-reinforced composites which are widely used in today's industry are good examples of transversely isotropic materials. Development of an effective and accurate NDT method based on these modeling results can be of paramount importance for in-service monitoring of damage in composite structures.
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Dao, Cac Minh. "Ultrasonic Wave Propagation on an Inclined Solid Half-Space Partially Immersed in a Liquid." Diss., The University of Arizona, 2007. http://hdl.handle.net/10150/195600.
Full textAbstract:
The interaction between a bounded ultrasonic beam and a liquid wedge over a solid half-space is studied theoretically as well as experimentally. A semi-analytical technique called Distributed Point Source Method (DPSM) is adopted for modeling the ultrasonic field in a wedge-shaped fluid structure on a solid half-space. This study is important for analyzing and understanding the propagation of ultrasonic waves used for underwater communications and inspections. A better understanding of the elastic wave propagation in water and in submerged marine strata near the seashore requires extensive investigations of such problem geometries. The semi-analytical technique used in this dissertation considers a bounded acoustic beam striking a fluid-solid interface between a fluid wedge and a solid half-space. Solution of this problem is beyond the scope of the currently available analytical methods when the beam is bounded. However, it is important to model the bounded beams because, in all underwater communications and inspections, bounded beams are used. Currently, only numerical method [Boundary Element Method (BEM) or Finite Element Method (FEM)] based packages (e.g., PZFlex) are in principle capable of modeling ultrasonic fields in such structures. However, these packages are not very accurate and are very CPU-intensive for high-frequency ultrasonic problems. At high frequencies, FEM- and BEM-based packages require huge amount of computation memory and time for their executions that the DPSM technique can avoid. The effect of the angle variation between the fluid-solid interface and the fluid wedge on the wave propagation characteristics is studied and presented.
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Hamada, Attoumani. "Les propriétés immunitaires des cellules souches de la pulpe dentaire dans un contexte infectieux." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0660/document.
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Les cellules souches de la pulpe dentaire humaine (DPSCs) sont des cellules souches mésenchymateuses (MSCs) isolées de la pulpe dentaire. Les DPSCs sont capables de s’auto-renouveler et se différencier en plusieurs types cellulaires tel que les odontoblastes, les ostéoblastes, les chondrocytes, les neuroblastes et les adipocytes. Les propriétés immunitaires des DPSCs sont de plus en plus étudiées, elles hébergent des récepteurs de types Toll à la surface, possedent une activité immuno-modulatrice.Cependant, les propriétés immunitaires comme celles décrites dans les cellules immunitaires professionnelles telles que la phagocytose, la production de composés anti-microbiens et le nouveau concept « Trained immunity » pourraient être étudiées. une brève revue a été élaborée pour mettre en évidence l'ensemble des propriétés immunitaires des DPSCs décrites dans la littérature. Ensuite, expérimentalement, nous avons montré que les DPSCs pouvaient internaliser le pathogène bactérien Bartonella quintana. En outre, nous avons décrit la capacité des DPSCs à développer une immunité entrainée “trained immunity”. Il s’agit d’une mémoire inflammatoire concernant deux cytokines IL-6 et MCP-1. La stimulation des DPSCs avec le ligand bactérien LPS ou PGN induit une augmentation de l’expression et de la production de l'IL-6 et du PGN après un second stimulus. Dans l'ensemble, l'étude des propriétés immunitaires des DPSCs montre que ces dernières peuvent agir comme des cellules immunitairesDental pulp Stem cells (DPSCs) are mesenchymal stem cells (MSCs) isolated from the dental pulp. DPSCs are able to self-renew and differentiate into several cell types such as odontoblasts, osteoblasts, chondrocytes, neuroblasts and adipocytes.The immune properties of DPSCs are being studied more and more, they harbor Toll-like receptor on the surface and have an immunomodulatory activity.However, immune properties such as those described in professional immune cells such as phagocytosis, production of antimicrobial compounds and the new concept "Trained immunity" could be studied.A brief review has been developed to highlight the set of immune properties of DPSCs described in the literature. Then, experimentally, we showed that DPSCs could internalize the bacterial pathogen Bartonella quintana.In addition, we have described the ability of DPSCs to develop trained immunity. It is an inflammatory memory concerning two cytokines IL-6 and MCP-1. Priming DPSCs with the bacterial ligand LPS or PGN induces an increase in the expression and production of IL-6 and PGN after a second stimulus.Overall, the study of the immune properties of DPSCs shows that DPSCs can act as immune cells
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Rehn, Alexandra [Verfasser]. "Adjectives and the Syntax of German(ic) DPs / Alexandra Rehn." Konstanz : KOPS Universität Konstanz, 2019. http://d-nb.info/1198680474/34.
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Hitchings, Matthew D. "Biochemical and structural analysis of the Streptomyces coelicolor Dps proteins." Thesis, Swansea University, 2013. https://cronfa.swan.ac.uk/Record/cronfa42992.
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The three DNA protection proteins from starved cells (Dps) of Streptomyces coelicolor are members of the min-ferritin super family. Considered to be of major importance to stress response systems in microorganisms. Dps proteins can aid microbial survival in extreme conditions. The S. coelicolor Dps proteins are not only induced in response to stress in a stimulus-dependent manner, but dual regulation allows these proteins to play a role in bacterial cell division; influencing condensation of nucleoids during spore formation. This study investigates the structural and functional properties of the ScDps proteins and finds multiple ways in which the homologs differ.