Dissertations / Theses on the topic 'Polar'
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Müller, Marion. "Polare Stratosphärenwolken und mesoskalige Dynamik am Polarwirbelrand = Polar stratospheric clouds and mesoscale dynamics at the polar vortex edge /." Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung, 2001. http://www.gbv.de/dms/bs/toc/334030064.pdf.
Full textKhesin, Boris, Alexei Rosly, and rosly@heron itep ru. "Polar Homology." ESI preprints, 2000. ftp://ftp.esi.ac.at/pub/Preprints/esi941.ps.
Full textTrueblood, Jeffrey Allen. "Polar night." Thesis, University of Iowa, 2013. https://ir.uiowa.edu/etd/2649.
Full textNewsham, David K. Sen Ayusman. "Palladium catalyzed copolymerizations of polar and non-polar monomers." [University Park, Pa.] : Pennsylvania State University, 2009. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-4528/index.html.
Full textHanan, Faridah Hanim Ab. "Plasticizer transportation studies in polar and non-polar rubbers." Thesis, London Metropolitan University, 2001. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341733.
Full textSILVA, ELIZANDRA MARTINS. "NANOSCALE MECHANICAL DEFORMATION MECHANISMS OF POLAR AND NON-POLAR ZNO." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2014. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=24779@1.
Full textCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
PROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTS. DE ENSINO
Neste trabalho foi estudado o mecanismo de deformação de faces polares e não polares do óxido de zinco (ZnO), através da introdução de defeitos mecânicos por nanoindentação. A estrutura cristalina estável do ZnO é do tipo wurtzita, de forte caráter anisotrópico já observado em relação a propriedades como piezoeletricidade e polarização espontânea. O mecanismo de deformação mecânica desses sistemas ainda não está bem esclarecido e são de vital importância na otimização de dispositivos optoeletrônicos. A extensão dos defeitos para cada orientação do cristal foi analisada via microscopia eletrônica de transmissão e correlacionada com o movimento de planos basais {0001} de forma divergente, em faces não polares (1100) e (1120), e ao movimento de planos piramidais {1011} de forma convergente para faces polares (0001) e (0001). A extensão da deformação induzida abaixo da superfície foi avaliada, onde foi possível identificar a formação de discordâncias do tipo parafuso que se propagam através do sistema de escorregamento (1120)(0001), se propagando de forma altamente localizada abaixo da superfície. O início da deformação plástica em monocristais é marcado por eventos plásticos súbitos (pop-ins). Estes eventos foram identificados e analisados em função da força e da extensão da deformação gerada. A topografia e forma das impressões residuais foi analisada usando microscopia de força atômica. Os defeitos observados no plano superficial tenderam a se propagar em direções preferenciais num processo induzido pela formação de zonas de tensão em torno da indentação. A formação de zonas de tensão trativa em uma dada direção aumenta a mobilidade das discordâncias, enquanto zonas de tensão compressiva agem contribuindo para o travamento. Estas zonas foram identificadas e a magnitude desta tensão foi estimada via catodoluminescência. Observamos também que a face polar (0001) apresentou um comportamento reativo, onde defeitos localizados abaixo da superfície foram revelados através do processo de limpeza.
In this work, deformation mechanisms of polar and non-polar zinc oxide (ZnO) were studied by nanoindentation tests. The stable crystal structure of ZnO is the wurtzite with a strong anisotropic character observed in relation to the piezoelectricity and spontaneous polarization properties, for example. The mechanical deformation mechanisms of these sorts of materials are not yet fully understood, being of vital importance for optoelectronic devices optimization.For each ZnO crystallographic orientation, the induced defects damages were analyzed by transmission electron microscopy (TEM) and correlated with the slip of basal planes {0001} in the divergent directions for the both non-polar faces (1100) and (1120), as well as for the both polar faces (0001) and (0001). Screw perfect dislocations were identified by propagating through the slip system (1120)(0001). The beginning of plastic deformation in single crystals is marked by pop-ins events. Such events were identified and analyzed in function of the applied force and size. The residual impressions topography and shape were analyzed by atomic force microscopy (AFM). The observed defects on the surface were propagated in a preferred direction induced by stress components around the indentation. Tensile stress generation in a certain direction increases the dislocations mobility, while compressive stress contributes to pinning regions. Stress components were identified and their magnitudes were estimated by cathode luminescence method. The polar face (0001) showed a reactive behavior; some defects produced underneath the surface were revealed by samples cleaning process.
Kullen, Anita. "Polar auroral arcs." Doctoral thesis, KTH, Alfvén Laboratory, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3562.
Full textPajuelo, Eduardo María Marta. "Jorge Polar, educador." Pontificia Universidad Católica del Perú, 2014. http://repositorio.pucp.edu.pe/index/handle/123456789/114170.
Full textLiu, Ling. "Polar codes and polar lattices for efficient communication and source quantization." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/48001.
Full textChang, Tse Yang. "Characterisation of polar (0001) and non-polar (11-20) ultraviolet nitride semiconductors." Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/242371.
Full textDihmes, Godoy Alfredo, Echevarría Diego Larach, and del Canto Fernando Yávar. "Valoración de La Polar." Tesis, Universidad de Chile, 2005. http://repositorio.uchile.cl/handle/2250/108353.
Full textEl-Agamey, Ali Abdel Ghani. "Acylperoxyl radicals and their reactions with carotenoids in polar and non-polar solvents." Thesis, Keele University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252583.
Full textEmery, Robert Michael. "Investigation into the growth of non-polar and semi-polar InGaN quantum dots." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708911.
Full textJohnston, C. F. "Characterization of (11-20) non-polar and (11-22) semi-polar GaN epitaxial films." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.605657.
Full textZhang, Yuan. "STM Investigation of Electric Polar Molecular Self-Assembly and Artificial Electric Polar Molecular Rotors." Ohio University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1416927903.
Full textSui, Yongqiang. "Toward polar 1,4-diphenylbutadiene materials." Diss., Columbia, Mo. : University of Missouri-Columbia, 2004. http://hdl.handle.net/10355/4099.
Full textThe entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (June 30, 2006). Includes bibliographical references.
Persson, Marcus. "Surfactants at non-polar surfaces." Doctoral thesis, KTH, Chemistry, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3444.
Full textThe aim of this thesis work was to investigate theadsorption of surfactants to different nonpolar interfaces.Particularly, the effects of the polar group and the nature ofthe hydrophobic interface were elucidated. The interfacialbehavior of the liquid-vapor interface was investigated bymeans of surface tension measurements. Here the effect of thepolar group and the hydrocarbon chain length was investigatedin a systematic manner. It was found that the shorter of thetwo chains examined, decyl, generated a larger surface pressurecontribution than the longer, dodecyl. Furthermore, the sugarbased surfactants behaved differently as compared to theethylene oxide based ones. The former could be modelled byassuming a hard disc behavior of the head group while thelatter displayed polymeric behavior. The influence of saltconcentration on the surface tension behavior of an ionicsurfactant, sodium dodecyl sulphate, was investigated. Theresult could be rationalized by employing the Gouy- Chapmanmodel to the polar region. Furthermore, mixtures of two sugarbased surfactants were investigated by surface tensionmeasurements and the adsorbed amount of the two components atthe interface atdifferent concentrations and fractions in thebulk were obtained by applying the Gibbs surface tensionequation. It was found that the molecule with the smaller headgroup adsorbed preferentially, and more so as the totalsurfactant concentration was increased. These findings could beexplained by considering the interactions generated by thedifferent head groups. The adsorption of sugar surfactants toan isolated hydrophobic surface was studied by means of wettingmeasurements and the behavior was similar to that at theliquid-vapor interface. Wetting isotherms were measured on twodifferent hydrophobic surfaces where the covalently attachedhydrophobic layers were in a crystalline and fluid state,respectively. The wetting results revealed that the sugarsurfactants anchored in the fluid hydrophobic layer. This had asignificant influence on the force profile. For example, at thecrystalline surface the surfactant monolayers were easilyremoved as the surface came into contact at relatively lowapplied loads. This was not the case when the hydrophobic layerwas in a fluid state. Here a significant fraction of thesurfactants remained between the surfaces. Disjoining pressureisotherms were measured using a sugar based surfactant thatwere thoroughly purified and compared to the as receivedsample. Even the purified sample showed a double-layer forcealthough lower as compared to the as received, one. Asignificant difference in foam stability was also observed.
Sawade, Hans. "Polar schaltende Lyomesophasen diskotischer Flüssigkristalle." [S.l.] : [s.n.], 2002. http://edocs.tu-berlin.de/diss/2002/sawade_hans.pdf.
Full textMillien, Pierre. "On a polar factorization theorem." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/38915.
Full textChoi, Kwansik. "Molecular interactions in polar solvents." Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/17851.
Full textRust, Arlene Elizabeth. "Thermohaline convection in polar seawater." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321658.
Full textSoria-Alvarez, Carmen. "Synthetic applications of polar metallocenes." Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614902.
Full textThesling, Bill. "Digital Cross-Polar Interference Canceller." International Foundation for Telemetering, 2010. http://hdl.handle.net/10150/604302.
Full textDual-polarized data transmission promises to double the system capacity by transmitting independent signals simultaneously on both polarizations in the same channel. However, the polarization orthogonality of the propagation field can not always be perfectly preserved in various environments. Also the antenna and waveguide networks may not be able to achieve absolute polarization isolation. Therefore cross-polarization interference becomes a severe source of performance degradation in dual-polar systems. This paper presents an all-digital design of the cross-polarization interference canceller (XPIC or CPIC). This canceller is designed to remove the cross-polar interference so that comparable performance to single-polar system can be achieved for each polarization. Specifically, this digital design aims for • Mitigating the cross-polarization interference caused primarily by antenna orientation. (Delay between the signals from both polarizations is considered insignificant.) • Can operate with time varying cross-polar interference varying at rates of 2-3 Hz and beyond. • Initial isolation can be as low as 10 dB. • Is well suited to an all digital modem where clocking from the A/D is independent of symbol timing recovery clocks.
Zhou, Linghui. "Polar Codes for Identification Systems." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-232176.
Full textIdentieringssystem frekommer verallt, till exempel, biometriska identieringssystemmed ngeravtryck och ansiktsigenknning, etc. Fundamentalt kan problemetbrytas ned i tv faser. Registreringsfasen dr data om anvndaren insamlas, komprimerasoch lagras, till exempel att ta ngeravtryck eller nna viktiga ansiktsdetaljer.I identieringsfasen, jmfrs en observation, ditt ngeravtryck elleransikte, med information som lagrats tidigare fr att ge ett positivt svar. Eftersomsystemet hanterar mnga anvndare r bde lagring och skning efter den rttaanvndaren utmanande.Syftet med detta projekt r att designa och implementera eektiva komprimeringsochidentieringsalgoritmer fr det hgdimensionella Identieringssystemet medM anvndare. Polar codes anvnds som det huvudsakliga verktyget. Frst implementerarvi polar codes fr eektiv kllkomprimering och designar sedan motsvarandeidentieringskartlggning. Kllkomprimering kan ses som kanalavkodningen avpolar codes och I identieringsfasen kan observationen ses som sido-informationen,s vi vervger att anvnda Wyner-Ziv kodning fr polar codes fr att rekonstrueraoch identiera. I nsta steg implementerar vi polar codes fr skra Wyner-Zivproblem. Detta tillter oss att spara komprimerad data i separata databaser ochterskapa med tv steg. Med registreringskarlggning och identieringskartlggningimplementerade utvrderar vi prestandan av de designade identieringssystemenmed metoder som felfrekvens av identieringar och berkningskomplexitet.
Burrows, Susannah. "Polar measurements of mesospheric CO." Oberlin College Honors Theses / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=oberlin1119041096.
Full textQuezada, María Paz. "Valoración de La Polar S.A." Tesis, Universidad de Chile, 2016. http://repositorio.uchile.cl/handle/2250/145727.
Full textEn el presente trabajo se desarrolló una valoración económica y financiera de Empresas La Polar, utilizando como método Flujos de Caja Descontados, esta valoración fue realizada utilizando la información financiera publicada por la empresa hasta el 30 de Septiembre de 2013 en sus memorias y en la Superintendencia de Valores y Seguros. Se realizó un análisis global de la empresa, tanto de su historia, como ha sido su desarrollo, a que segmento está enfocado, como financia sus proyectos, todos estos factores que nos permitieron realizar proyecciones financieras las cuales utilizando como metodología Flujo de Caja Descontados obtuvimos como resultado el precio de la acción. Para realizar las proyecciones financieras necesarias, es importante recaudar información financiera de Empresa La Polar y de la industria en la cual está inserta, para poder determinar cómo es el funcionamiento de esta, como le afectan la variables económicas y así poder construir supuestos consecuentes y conservadores, de modo de que nuestros cálculos sean lo más cercanos a la realidad. El objetivo de este trabajo es mostrar de una manera sencilla cómo se realiza en la práctica un análisis financiero de una empresa, que variables son necesarias tener en consideración, de donde puedes obtener la infurción necesaria para realizar los diferentes cálculos y posteriormente las proyecciones. La Valoración de Empresas, es considerada una buena herramienta en la toma de decisiones de inversión, ya que a través de esto puedes determinar si está en un precio de la acción es mayor o menor a su precio histórico, si es conveniente realizar compras o ventas de dicha acción, nos permite tener una visión basada en fundamentos financieros.
Dyck, Markus Guido. "Effects of tundra vehicle activity on polar bears ( Ursus maritimus) at Churchill, Manitoba." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ63946.pdf.
Full textNowack, Rüdiger Jens. "Neutral nickel and palladium complexes as catalysts in copolymerizations of polar and non-polar monomers." [S.l. : s.n.], 2008. http://nbn-resolving.de/urn:nbn:de:bsz:289-vts-63659.
Full textGunkel, Felix [Verfasser]. "The role of defects at functional interfaces between polar and non-polar perovskite oxides / Felix Gunkel." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2013. http://d-nb.info/1044492325/34.
Full textBennett, Megan. "Energy Transfer Dynamics in Collisions of Polar and Non-polar Gases with Functionalized Self-Assembled Monolayers." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/33229.
Full textMaster of Science
Gong, Yipin. "MOCVD growth and optical investigation of III-nitride materials including non-polar and semi-polar GaN." Thesis, University of Sheffield, 2014. http://etheses.whiterose.ac.uk/4991/.
Full textDrinkwater, Mark Roland. "Radar altimetric studies of polar ice." Thesis, University of Cambridge, 1987. https://www.repository.cam.ac.uk/handle/1810/268053.
Full textMcCallum, Adrian Bruce. "Cone penetration testing in polar snow." Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/244073.
Full textMargerum, Michael Robert. "Equations of state for polar fluids." Thesis, University of Ottawa (Canada), 1989. http://hdl.handle.net/10393/5863.
Full textZhou, Wei Hua. "Spectral approximation by the polar transformation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq25988.pdf.
Full textWelch, C. S. "Servicing polar platforms using electric propulsion." Thesis, Cranfield University, 1992. http://hdl.handle.net/1826/3435.
Full textDay-Williams, Michaela Joanne. "Polar flagellum glycosylation in aeromonas caviae." Thesis, University of Sheffield, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.515262.
Full textTabor, Richard F. "Surfactant kinetics in non-polar solvents." Thesis, University of Bristol, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.508096.
Full textRussell, B. C. "The polar surfaces of strontium titanate." Thesis, University of Oxford, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.497089.
Full textHomam, Mariyam Jamilah. "Radiowave propagation in the polar ionosphere." Thesis, University of Leicester, 2012. http://hdl.handle.net/2381/10812.
Full textHill, E. M. H. "The foliar penetration of polar compounds." Thesis, Liverpool John Moores University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379437.
Full textGregory, Philip David. "Coherent control of ultracold polar molecules." Thesis, Durham University, 2018. http://etheses.dur.ac.uk/12484/.
Full textRiddolls, Ryan James 1974. "Structure of the polar electrojet antenna." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/16945.
Full textIncludes bibliographical references (p. 153-156).
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Field experiments were performed in Gakona, Alaska in August and November 2002. The ionospheric conductivity was periodically perturbed using amplitude-modulated radiation from the HAARP HF transmitter (1 MW power, 14 dB gain, 3.3-5.8 MHz carrier, 0.1-40 kHz modulation). The conductivity perturbations lead to perturbations to the natural flow of electrojet current in the lower ionosphere, resulting in ELF/VLF radiation at the modulation frequency. Measurements of the radiation, along with analytic and numerical models, suggest that a vertical loop with a scale size of 10 km is the dominant current structure excited during the experiments.
by Ryan James Riddolls.
Ph.D.
Hayat, Hassan. "Polar vortex and generation fuel diversity." Kansas State University, 2015. http://hdl.handle.net/2097/19094.
Full textDepartment of Electrical and Computer Engineering
Anil Pahwa
The unusual weather events during the polar vortex of 2014 illuminated the needs for fuel diversity for power generation in order to allow reliable operation of the electricity grid. A system wide reliability assessment for winter months should be undertaken in addition to the summer months to ensure reliable operation of the electricity grid throughout the year. Severe weather conditions that lead to equipment malfunction during the polar vortex should be thoroughly investigated and remediations to ensure satisfactory future performance of the grid must be undertaken. Environmentally unfriendly emissions from power plants must be minimized but diversity of generation fuel must be maintained. Future energy policies must be formulated with consideration that approximately 14 GW of coal generation in Pennsylvania Jersey Maryland Regional Transmission Organization’s control area available during the polar vortex will be retired by 2015 and replaced with plants that utilize fuel types other than coal.
Nielsdóttir, Maria Chun. "Iron biogeochemistry in (sub-) Polar waters." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/145859/.
Full textPeng, Liz Shihching. "p5.Polar - Programming For Geometric Patterns." Digital WPI, 2020. https://digitalcommons.wpi.edu/etd-theses/1353.
Full textAkyol, Fatih. "N-Polar III-Nitride Optoelectronic Devices." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1307562902.
Full textTürk, Serhat, and Kristoffer Müller. "Kinetic Art Table : Polar sand plotter." Thesis, KTH, Mekatronik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-296307.
Full textCNC-maskiner används med massor av olika implementationer, en av dem är i det här projektet där en polar CNC maskin användes för att rita fascinerande mönster på ett bord fylld med fin sand. Denna konstruktion läste in G-kod och konverterade det till polära koordinater. Förmågan av vad maskinen kunde rita testades, allt från ODE grafer till specialtillverkade mönster och ritningar med hjälp av Sandify. Aven om de olika mönstren ritades ordentligt men med mindre små fel var ODE för svårt att rita på grund av att det krävde en mindre magnetisk kula och ännu mer noggrannhet jämfört med detta system. Denna maskin alstrade också ljud på cirka 33 dB under användning.
Oyama, Toshiyuki. "Synthesis of Novel Aprotic Polar Polymers." Kyoto University, 1999. http://hdl.handle.net/2433/181827.
Full textSritana-Anant, Yongsak. "Polar-pi interactions : the model studies /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2000. http://wwwlib.umi.com/cr/ucsd/fullcit?p9970663.
Full text