Dissertations / Theses on the topic 'Active and passive'
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Pourabdollah, Nezhad Maziar. "Active and passive plasmonic devices." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2007. http://wwwlib.umi.com/cr/ucsd/fullcit?p3284224.
Full textTitle from first page of PDF file (viewed January 14, 2008). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 93-102).
Zuo, Fei. "Passive and active currency portfolio optimisation." Thesis, University of Exeter, 2016. http://hdl.handle.net/10871/22612.
Full textMaldonado-Mercado, Julio Cesar. "Passive and active control of structures." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36654.
Full textIncludes bibliographical references (leaves 94-98).
by Julio Cesar Maldonado-Mercado.
M.S.
Scheitrum, Raquel. "Smoking passive addiction or active coping? /." Instructions for remote access. Click here to access this electronic resource. Access available to Kutztown University faculty, staff, and students only, 1999. http://www.kutztown.edu/library/services/remote_access.asp.
Full textSource: Masters Abstracts International, Volume: 45-06, page: 2778. Typescript. Abstract included as two unpaged leaves at back of volume. Includes bibliographical references (leaves 30-35).
Kartha, Satish Chandrashekhar. "Active, Passive and Active/Passive Control Techniques For Reduction of Vibrational Power Flow in Fluid Filled Pipes." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/31156.
Full textMaster of Science
Hassan, Samy Aly. "Fundamental studies of passive, active and semi-active automotive suspension systems." Thesis, University of Leeds, 1986. http://etheses.whiterose.ac.uk/2691/.
Full textKim, Sangcheol. "Fabrication of active and passive terahertz structures." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 60 p, 2006. http://proquest.umi.com/pqdweb?did=1203570961&sid=6&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Full textGarcia, Nil. "Optimization Methods for Active and Passive Localization." Phd thesis, Toulouse, INPT, 2015. http://oatao.univ-toulouse.fr/14192/1/garcia.pdf.
Full textOh, Yim-Taek. "Passive and active drag of paralympic swimmers." Thesis, Manchester Metropolitan University, 2015. http://e-space.mmu.ac.uk/615953/.
Full textAl-Mahmoud, Abdulrazzak M. "Microwave passive tunable and active bandpass filters." Thesis, Cranfield University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309711.
Full textCampillo, Javier. "From Passive to Active Electric Distribution Networks." Doctoral thesis, Mälardalens högskola, Framtidens energi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-31592.
Full textZhou, Shaoyi. "Advances in passive and active damping techniques." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEI066.
Full textMechanical systems (e.g. flexible structures) are usually lightly damped so that they vibrate severally in response to dynamic loads. Therefore, vibration control strategies should be adopted in order to reduce the undesired vibration of mechanical systems. The objective of this thesis is to develop multiple vibration control techniques, which are either passive or active. The first part focuses on the application of inerter to enhance the vibration control performance of two existing control devices, the tuned mass damper (TMD) and the series double TMD (SDTMD). The inerter is employed to relate the tuned mass to the ground. In the case of TMD, a mechanical system under stiffness uncertainty is considered and the worst-case H-infinity optimization is addressed by means of an entirely algebraic approach. In the case of SDTMD, the vibration of a deterministic mechanical system is to be controlled and the H-infinity optimal design is carried out via an extended version of fixed points theory (FPT). Instead of using the inerter, the second part consists in improving the control effect by incorporating a linear negative stiffness between the ground and the tuned mass. Two case studies are conducted based on the non-traditional TMD and inerter-based dynamic vibration absorber (IDVA), whose tuned mass is related to the ground by a viscous damper or an inerter-based mechanical network, respectively. Later, the exact electrical realization of non-traditional configurations with or without negative stiffness is proposed, which is based on the piezoelectric transducer enclosed by a particular shunt circuit. This electromechanical analogy enables to extend the applicability of mechanical control devices and to facilitate the precise tuning. In the last part, active and semi-active vibration control techniques are developed. The first strategy consists in enhancing the control capability of passive TMD and IDVA by feeding back the displacement signal of mechanical system to the electromagnetic actuator. The proposed controller can be regarded as one or multiple basic units arranged in series, which is featured by one pole at the origin and two coalesced zeros on the real axis. Distinguished from the previous strategy, the semi-active control technique is based on electromagnetic shunt damping (EMSD), therefore, no additional sensor is required to measure the information of mechanical system. In order to artificially increase the shunt damping performance, the employment of negative inductance (NI) in the shunt circuit is considered. Three possible layouts of NI in the EMSD are assessed in terms of the electromechanical coupling factor, which quantifies the energy conversion efficiency between mechanical and electrical domains. Finally, six types of shunt circuits are optimally tuned according to the FPT and the beneficial effect of NI and the influence of its layout can be underlined
Molander, Jonathan, and Loo Lennart van. "Active Versus Passive Investing : A Comparative Analysis." Thesis, Internationella Handelshögskolan, Jönköping University, IHH, Företagsekonomi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-49153.
Full textSAXBY, DYANI J. "ACTIVE AND PASSIVE FATIGUE IN SIMULATED DRIVING." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1195507547.
Full textWatson, Rose E. (Rose Elliott). "Active or Passive Voice: Does It Matter?" Thesis, University of North Texas, 1993. https://digital.library.unt.edu/ark:/67531/metadc501082/.
Full textPoon, Joyce Kai See Yariv Amnon. "Active and passive coupled-resonator optical waveguides /." Diss., Pasadena, Calif. : California Institute of Technology, 2007. http://resolver.caltech.edu/CaltechETD:etd-05242007-105741.
Full textMoore, Garrett Lee. "A Hybrid (Active-Passive) VANET Clustering Technique." Diss., NSUWorks, 2019. https://nsuworks.nova.edu/gscis_etd/1077.
Full textSvanberg, Mikaela, and Emilia Karlsson. "Active or Passive Fund Management : A comparison between active and passive Swedish funds before, during and after the financial crisis." Thesis, Linnéuniversitetet, Institutionen för ekonomistyrning och logistik (ELO), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-75394.
Full textKazemi, Alireza. "Mutual Fund Performance : Active- and Passive Fund Management." Thesis, Jönköping University, JIBS, Economics, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-1226.
Full textIn this thesis I will examine active equity mutual fund managers’ ability to outperform an index, which is done by utilizing a sample of four equity mutual funds that mainly invest in large Swedish quoted companies. In order to measure the risk-adjusted performance of the funds, a model created by Michael Jensen will be used. Furthermore, I will investigate whether the managers of the mutual funds increase/decrease the risk level, or rather the beta, when the stock market is bullish/bearish. Hence, two time spans have been chosen, 2001-2003 and 2004-2006, where the previous represents a bearish stock market and the later represents a bullish stock market.
The empirical evidence indicates that one fund in each period was significantly outper-formed by the comparable index. Furthermore, the result also suggests that two significant funds were talking more risk than the index in the bearish time period while three signifi-cant funds decreased the risk level during the bullish time period.
Denna kandidatuppsats undersöker aktiva fondförvaltares förmåga att upptäcka och inve-stera i fonder som presterar bättre än deras jämförekse index. Undersökningen är baserad på fyra aktiefonder som huvudsakligen investerats i Svenska börsnoterade företag. Fonder-nas riskjusterade prestation kommer att mätas med hjälp av en modell som är utformad av Michael Jensen.
Vidare kommer uppsatsen att undersöka om fondförvaltarna ökar eller minskar risk nivån, eller betavärdet, baserat på börsens utveckling under åren 2001-2003 och 2004-2006. Det förgående intervallet representerar en sjunkande börsperiod och det senare en stigande börsperiod.
Det empiriska resultatet indikerar att en signifikant fond i varje tidsintervall presterade säm-re än index. Utöver detta visade även resultatet att två signifikanta fonder ökade risk nivån, jämfört med index, i den sjunkande börsperioden medan tre signifikanta fonder minskade risk nivån i den stigande börsperioden.
Karam, Philippe Chucri. "Modeling passive and active mechanisms in motoneuron dendrites." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/13713.
Full textSherwani, Hashir. "Resource management in active-passive multifunction radar networks." Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10056926/.
Full textSousa, Júnior Gabriel Faria de. "Active versus passive management : the case of BOVESPA." Master's thesis, Instituto Superior de Economia e Gestão, 2016. http://hdl.handle.net/10400.5/11647.
Full textO principal objetivo deste trabalho é analisar alguns modelos subjacente à gestão de carteiras ativa e passiva e qual seria seu impacto sobre a escolha de uma determinada carteira constituída por ações que estão integrados no índice BOVESPA, maior mercado bolsista do Brasil. A gestão passiva é baseada numa carteira que visa replicar o comportamento do Índice BOVESPA, tendo como base os preços históricos do índice e no método naïve (1/N), no qual composição da carteira inclui todos os ativos do índice com as mesmas proporções. A gestão ativa baseia-se no método de Markowitz, conhecido como modelo de média variância, que visa maximizar o retorno tendo definido um determinado nível de risco, ou minimizar o risco tendo em conta um nível de retorno esperado. Também é usado o método da variância mínima que consiste em minimizar o risco independentemente do retorno. Nesta abordagem as proporções a investir em cada ativo são revistas mensalmente tendo em conta a evolução do mercado. Outro modelo utilizado será um método ajustado da média variância em que serão mantidos os pesos ótimos do primeiro período para as restantes janelas de dados. Para as determinar são consideradas "janelas" de dados de 1 e 2 anos. É considerado um horizonte de investimento de 10 anos, a partir de Janeiro de 2005 a Dezembro de 2014. Com base nos resultados é possível afirmar que a carteira de média variância deve ser a escolhida, uma vez que apresenta os melhores resultados.
The main purpose of this paper is to analyze some models underlying the active and passive portfolio management and what would be its impact on the choice of a portfolio composed by stocks which are integrated in BOVESPA Index, Brazilian biggest stock market. The passive management approach is based on the historical prices of BOVESPA Index which replicates the behavior of the market and on the naïve method (1/N), in which the portfolio includes all the stocks on the index with the same proportions. Active management is based on the Markowitz model, also known as mean variance model, whose objective is to maximize the return give a set risk level or, minimize the risk given an expected return. The minimum variance model is also used, whose goal is to minimize the risk independent of the return. On these approach the weights of each asset in the portfolio are revised monthly, based on the market evolution. Another model used is a Mean Variance adjusted method in which the first period optimal weights will be maintained for the remaining data windows. In order for these to be determined, "windows" of 1 and 2 years were used. We are considering a 10 year investment horizon, from January 2005 to December 2014. Based on the results, we can affirm that the mean variance portfolio should be chosen, as performed better both in terms of returns and, especially, in terms of Sharpe ratio when compared with the other two portfolios.
Zhang, Zhaowei. "Passive and active Bragg gratings for optical networks." Thesis, University of Southampton, 2007. https://eprints.soton.ac.uk/47760/.
Full textGoldstein, Andre L. "Control of Sound Transmission with Active-Passive Tiles." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/27913.
Full textPh. D.
Lam, Margaretha Johanna. "Hybrid Active/Passive Models with Frequency Dependent Damping." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/30770.
Full textPh. D.
Ziolkowski, Richard W. "Passive and active metamaterial-inspired nano-scale antennas." IEEE, 2016. http://hdl.handle.net/10150/623141.
Full textHuang, Caijin. "Optical nano-antennas : passive properties and active control." Thesis, Dijon, 2010. http://www.theses.fr/2010DIJOS011/document.
Full textOptical nanoantennas are a new class of optical devices, generally constituted of metal nanoparticles, used for enhancing the interaction between an electromagnetic wave and a nano-scale object. These components are operating in the visible to near infra-red part of the spectrum and are offering solutions for the inherent limitations of optics at the nanometer scale. In particular, the properties of optical antennas are governed by the surface plasmon resonances of the underlying structure. These resonances are associated with a large field confinement, beyond the diffraction limit, and an enhancement of the local electromagnetic response that is used to amplify weak optical processes. The objective of this doctoral thesis is to understand by an experimental approach what are the key parameters characterizing an optical antenna with the aim to control its operation. Through the development of an original microscopy based on a low numerical aperture diascopic illumination and a subsequent spatial filtering, the scattering characteristics of a single optical nano-antenna were successfully measured. Our approach was first tested with simple model antennas (nanoparticles) before investigating multi-element coupled antennas (dimers). In analogy to radiofrequency theory, we have defined and measured important antenna characteristics: operating frequency, detuning factor, gain and emission diagram. We have studied the influence of the morphology of the antenna on these characteristics. Continuing the comparison with microwave antennas, we have introduced the concept of an optical tuner. The operating principle is to modify the medium in which the antenna is emitting its radiation i.e. the load of the device. To this aim, we have employed anisotropic liquid crystal molecules. With this load medium, the orientation of the anisotropy can be controlled by a static electric field. The operation of the optical tuner, i.e. tuning of the antenna to a broadcasting frequency, is demonstrated for electromagnetically coupled antennas
Zhou, Xuan. "Advances in hybrid plasmonics : from passive to active functions." Thesis, Troyes, 2013. http://www.theses.fr/2013TROY0015/document.
Full textHybrid plasmonics has given rise to increasing interest in the context of the interaction between metal nano-objects and other materials. By benefiting from each of its constituents, hybrid nanostructures are commonly adopted in studies and optimization of biological and chemical sensors, nanoparticle with high plasmon resonance tunability, and nano-emitters. This PhD thesis presents a hybrid nanostructure of photopolymer/metal nanoparticle that is used as a near-field characterizing tool and as an anisotropic nano-emitter.The fabrication of this hybrid nanostructure is a near-field imprinting process based on nanoscale photopolymerization. This technique, compared with traditional near-field characterization methods, provides not only the image of the field distribution, but also enables quantification of the surface plasmon properties with sub-5nm resolution and reproduction of the exponential decay of the near-field.Under dipolar mode plasmon, the photopolymer was created anisotropically in the vicinity of the metal nanoparticle. With high concentration of dye molecules trapped in the polymer, the hybrid nano-emitter displays surface enhanced fluorescence and Raman signal that is dependent on the incident polarization. To our knowledge, this is the first achievement of the anisotropic nano-emitter based on the inhomogeneous distribution of the active molecule
Lindberg, Peter. "Wideband Active and Passive Antenna Solutions for Handheld Terminals." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-7445.
Full textMuckaden, Sachit. "Myspeedtest: active and passive measurements of cellular data networks." Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47674.
Full textTehrani, Maryam Ghandchi. "Passive modification and active vibration control by receptance method." Thesis, University of Liverpool, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.441935.
Full textChang, Kuo-Wei. "Passive and Active Control of Wind Induced Bridge Vibration." Thesis, University of Nottingham, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.523132.
Full textPotter, Jack. "Passive and semi-active damping of base-excited structures." Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.618724.
Full textChey, Min Ho. "Passive and Semi-Active Tuned Mass Damper Building Systems." Thesis, University of Canterbury. Civil and Natural Resources Engineering, 2007. http://hdl.handle.net/10092/3431.
Full textPaust, Tobias [Verfasser]. "New Methods for Passive and Active Microrheology / Tobias Paust." Ulm : Universität Ulm. Fakultät für Naturwissenschaften, 2013. http://d-nb.info/1035699613/34.
Full textPournara, Iosifina-Vasiliki. "Reconstructing gene networks by passive and active Bayesian learning." Thesis, Birkbeck (University of London), 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417001.
Full textLi, Weibing. "Prismatic modular robotics enabled through active and passive elements." Thesis, University of Leeds, 2018. http://etheses.whiterose.ac.uk/20112/.
Full textCho, Seong-Ho 1966. "Laser micromachining of active and passive photonic integrated circuits." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/30086.
Full textIncludes bibliographical references (leaves 149-158).
This thesis describes the development of advanced laser resonators and applications of laser-induced micromachining for photonic circuit fabrication. Two major advantages of laser-induced micromachining are direct patterning and writing on large areas of substrates at high speed following the exposure of laser light, without using complicated photomask steps. For passive photonic devices fabrication, a novel femtosecond laser with unprecedented low repetition rates of 4 MHz is demonstrated to generate high intensity pulses, as high as 1.25 MW with 100 nJ pulse energies and 80 fs pulse durations directly from this laser resonator, without using any active devices or amplifiers. These high intensity pulses are applied to transparent glass materials to demonstrate micromachining of waveguides, gratings, couplers, and three dimensional waveguides and their beam couplings. Active and passive semiconductor devices can be monolithically integrated by employing high energy laser pulses to locally disorder quantum well regions. The 45 nm bandgap shifts at 1.55 ptm with a standard Q-switched Nd:YAG laser at 535 nm are realized. Finally, unidirectional semiconductor ring lasers for high-density integration are developed as a potential application to photonic integrated circuits. Hybrid semiconductor S-crossover and retro-reflected ring lasers, as prototypes for unidirectional operation, are built and result in up to 21.5 dB and 24.5 dB of counter-mode suppression ratio, respectively, which is in good agreement with theoretical predictions.
by Seong-Ho Cho.
Ph.D.
Topudurti, Shruti. "Determinants of Flows Between Active and Passive Equity Investments." Scholarship @ Claremont, 2018. http://scholarship.claremont.edu/cmc_theses/1952.
Full textWang, Fucheng. "Design and synthesis of active and passive vehicle suspensions." Thesis, University of Cambridge, 2001. https://www.repository.cam.ac.uk/handle/1810/272316.
Full textDelabroy, Olivier. "Oxydes d'azote et leur contrôle : solutions passive et active." Châtenay-Malabry, Ecole centrale de Paris, 1996. http://www.theses.fr/1996ECAP0494.
Full textBlankenship, Tashauna L. "Episodic Memory during Middle Childhood: Active vs. Passive Processing." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/78120.
Full textMaster of Science
DuGar, Grace A. "Passive and Active Masculinities in Disney’s Fairy Tale Films." Cleveland State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=csu1367849096.
Full textWang, Huaiyi. "Achieving Efficient Spectrum Usage in Passive and Active Sensing." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1483709288836523.
Full textGazuz, Igor. "Active and passive particle transport in dense colloidal suspensions." [S.l. : s.n.], 2008. http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-66299.
Full textPriest, Kevin Kennett. "Life cycle costing of active and passive solar retrofits." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0024497.
Full textFerreira, Sonia Maria Gomes. "Mapping passive x active reading tasks in esap teaching." Florianópolis, SC, 2003. http://repositorio.ufsc.br/xmlui/handle/123456789/86007.
Full textMade available in DSpace on 2012-10-21T02:23:41Z (GMT). No. of bitstreams: 1 193974.pdf: 1398356 bytes, checksum: 434bf850dfa1afe48ece01ce5d077ae0 (MD5)
Esta pesquisa fez um mapeamento de tipos de atividades de leitura em livros de Inglês Instrumental utilizados na UFSC; realizou uma investigação correlata em salas de aula; observou a ressonância que tipos diferentes de atividades de leitura podem exercer na motivação, e reflexão crítica dos alunos. O primeiro estudo sondou a predominância de tipos de atividades em 6 livros de Inglês Instrumental; o segundo pesquisou as tarefas dominantes nas aulas de 4 professores; o terceiro investigou a reação de alunos de 3 turmas, perante dois blocos de tipos diferentes de atividades. As observações, transcrições das aulas, e questionários, foram os instrumentos utilizados para análise dos dados. O arcabouço teórico de Davies (1995), de atividades 'passivas' e 'ativas', deu respaldo aos estudos. Os resultados atestam a predominância de atividades 'ativas' nos livros analisados e nas aulas de 3 dos 4 professores observados. Constatou-se também mais motivação, e mais evidências de leitura crítica, durante o uso de tarefas 'ativas'. Tópicos como, instrução baseada no uso de tarefas, demanda cognitiva de diferentes tipos de atividades, diferenças individuais de estilo de ensino/aprendizagem, pensamento crítico, e independência do aprendiz, serviram como aparato teórico para a pesquisa. Outras descobertas importantes foram: que a delimitação entre o que Davies (1995) coloca como atividade 'passiva' ou 'ativa' parece não ser clara, não proporcionando flexibilidade para a variação de demanda cognitiva imposta por cada tipo de tarefa; a maneira de condução das atividades também parece ser mais crucial do que supunha a premissa inicial.
Cambou, Pierre E. "A Distributed Active Vibration Absorber (DAVA) for Active-Passive Vibration and Sound Radiation Control." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/10105.
Full textMaster of Science
Hussain, Arshad. "High-resolution passive and active-passive switched-capacitor delta-sigma modulator design techniques in nanoscale CMOS." Thesis, University of Macau, 2017. http://umaclib3.umac.mo/record=b3691845.
Full textGerson, Sarah A. "What's in a mitten? the effects of active versus passive experience on action understanding /." College Park, Md.: University of Maryland, 2008. http://hdl.handle.net/1903/8474.
Full textThesis research directed by: Dept. of Psychology. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.