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Dissertations / Theses on the topic 'Fiber position'

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1

Hausien, H. H. "Pulse position modulation for optical fiber local area networks." Thesis, University of Bath, 1991. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292804.

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2

Kinney, Stuart. "The development of an optical position sensor." Virtual Press, 1998. http://liblink.bsu.edu/uhtbin/catkey/1115421.

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A theoretical study of an electrically passive, loss-compensated, optical position sensor is the goal of this project. Optical fiber sensors exploit light as the information carrier. Fiber-optic sensors consist of a constant light source launched into an optical fiber and transmitted to another point at which a measurement is made.In the proposed optical position sensor, a Light Emitting Diode (LED) produces a constant beam of light, which is channeled through an optical fiber to a Graded Index (GRIN) lens. This lens makes all the light rays parallel to one another, a process called collimatio
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3

Song, Lijun. "Detection and Position Location of Partial Discharges in Transformers Using Fiber Optic Sensors." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/35928.

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Power transformers are one of the most important components in the electrical energy network. Extending transformer life is very economically valuable due to power outage. Therefore the development of instruments to monitor the transformer condition is of great interest. Detection of partial discharges (PDs) in power transformers is an effective diagnostic because it may reveal and quantify an important aging factor and provide information on the condition of the transformer. However, partial discharge diagnostics are still not effectively used for online monitoring of transformers because of
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4

Thurner, Klaus Verfasser], Paolo [Akademischer Betreuer] [Lugli, Khaled Gutachter] Karrai, and Paolo [Gutachter] [Lugli. "Position sensing using a fiber-optic Fabry-Pérot interferometer / Klaus Thurner ; Gutachter: Khaled Karrai, Paolo Lugli ; Betreuer: Paolo Lugli." München : Universitätsbibliothek der TU München, 2018. http://d-nb.info/1159703159/34.

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5

Mårtensson, Jesper. "Handbollsspelares effektutveckling i olika riktningar." Thesis, Malmö universitet, Fakulteten för lärande och samhälle (LS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-34627.

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The purpose of this dissertation is to analyze Swedish male handball players power in the lower limbs, dependent on position, in different anatomical planes. Previous studies has examined vertical and horizontal power but not medial lateral power. This study used previous studies as theory. Power was examined through vertical, horizontal and medial lateral CMJAS, unilateral and bilateral, in a laboratory setting. The vertical jumping performance was measured with ‘My Jump 2’ and the vertical power (W; W/kg) was calculated with Lewis formula. Only the jumping performance (cm) was noted in the h
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6

Aubin, Sébastien. "Capteurs de position innovants : application aux Systèmes de Transport Intelligents dans le cadre d'un observatoire de trajectoires de véhicules." Phd thesis, Institut National Polytechnique de Toulouse - INPT, 2009. http://tel.archives-ouvertes.fr/tel-00484751.

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Améliorer la sécurité routière passe par une meilleure compréhension des causes d'accidents. Il est nécessaire de développer des observatoires discrets pour étudier la manière de conduire de tous les automobilistes. Une partie de cette analyse implique l'utilisation de capteurs mesurant les trajectoires des véhicules sur une portion de route. Deux capteurs innovants ont été crées pour pallier au manque de capteurs suffisamment précis : le premier est un capteur à fibres optiques présentant une succession de réseaux de Bragg et le second, protégé par un brevet, est fondé sur une technologie rés
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7

Колесник, Віталій Олександрович, Виталий Александрович Колесник, Vitalii Oleksandrovych Kolesnyk та ін. "Исследование влияния ориентации волокон углепластика на качество поверхности, обработанной резанием". Thesis, Сумский государственный университет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/39702.

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Композиционные материалы (КМ) и в частности углепластики (волокнистые полимерные композиционные материалы (ВПКМ)), все чаще приходят на смену сталям, металлическим сплавам и другим традиционным конструкционным материалам в авиа-, автомобилестроении, энергетике, военно-промышленном комплексе.
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8

Calvert, N. "An optical fibre digital pulse position modulation system." Thesis, University of Huddersfield, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382254.

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9

Cryan, Robert Anthony. "High sensitivity optical digital pulse position modulation systems." Thesis, University of Huddersfield, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306086.

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Digital pulse position modulation (PPM) is a transmission format that can be used to exchange excess channel bandwidth for improved receiver sensitivity. This thesis is concerned with the performance of digital PPM for use in optical fibre systems such that increased single-span transmission distances can be achieved. It includes a literature survey and a thorough theoretical investigation into uncoded directly detected and coherently detected digital PPM, along with an evaluation of forward error correction coded PPM. Original contributions are described for digital PPM systems employing PIN-
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10

Wang, Y. "Linecoded digital pulse position modulation for repeatered optical fibre telecommunications." Thesis, University of Essex, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376832.

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11

Elmirghani, Jaafar Mohamed Hashim Mohamed Osman. "Frame and slot synchronisation for optical fibre digital pulse position modulation." Thesis, University of Huddersfield, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359740.

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12

Ansbergs, Christa R. 1976. "Optimization of the glass fiber forming process for single-tip and small-number-tip positions." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/41028.

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Thesis (S.M. and S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1999.<br>Includes bibliographical references (p. 93).<br>The design of fiberglass manufacturing setups has evolved largely by trial and error. Efforts are now in place to achieve a better understanding of the fiber forming process. To facilitate this research, a smaller and simpler version of the full-scale fiber forming process is being used. This system has vastly different geometry and produces a small number of fibers. Work in this project has concerned optimization of the small-scale process to
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13

Meng, Ling-Jian. "Advances in medical imaging and gamma ray spectroscopy." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342654.

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14

Oliveira, Marcus Vinicius Nunes de. "Estudo de operaÃÃes lÃgicas atravÃs da modulaÃÃo por posiÃÃo de pulso no domÃnio da frequÃncia (PPFDM) em AOTF convencional e baseado em fibra de cristal fotÃnico." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=11498.

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Neste trabalho, propomos um novo mÃtodo de modulaÃÃo Ãptica usando um filtro acÃstoÃptico sintonizÃvel (AOTF) convencional e um filtro acÃsto-Ãptico com polarizaÃÃo sintonizÃvel (AOTPF) baseado em fibra de cristal fotÃnico (PCF), onde portas lÃgicas Ãpticas E e OU sÃo obtidas pela operaÃÃo simultÃnea da modulaÃÃo em dupla banda lateral Ãptica (ODSB) e da modulaÃÃo por posiÃÃo de pulso no domÃnio da frequÃncia (PPFDM). Estes dispositivos sÃo operados com pulsos sÃlitons ultracurtos de 100 ps e 55,5 fs para o AOTF convencional e para o AOTPF baseado em PCF, respectivamente. Desta forma, um pulso
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15

Asserda, Said. "Convexite holomorphe des domaines pseudoconvexes par rapport a un fibre holomorphe en droites positif." Paris 6, 1994. http://www.theses.fr/1994PA066017.

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Soient m une variete analytique complexe compacte et e un fibre en droites holomorphe au-dessus de m. On demontre que si d est un domaine localement pseudoconvexe dans m alors d est holomorphiquement convexe relativement aux sections holomorphes globales des puissances tensorielles elevees de e. La demonstration repose essentiellement sur les estimations l#2 de l. Hormander pour l'operateur (en fait la version precise adaptee aux problemes d'ideaux obtenue par h. Skoda) afin de construire des sections globales de e#r sur d qui tendent vers l'infini en un point de frontiere donne de d. On remar
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16

Andersson, Stefan. "Low consistency refining of mechanical pulp : process conditions and energy efficiency." Licentiate thesis, Mittuniversitetet, Institutionen för naturvetenskap, teknik och matematik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-15406.

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The thesis is focussed on low consistency (LC) refining of mechanical pulp. Theresearch included evaluations of energy efficiency, development of pulpproperties, the influence of fibre concentration on LC refining and effects of rotorposition in a two-zoned LC refiner. Trials were made in mill scale in a modern TMP line equipped with an MSDImpressafiner for chip pre-treatment, double disc (DD) first stage refining and aprototype 72-inch TwinFlo LC refiner in the second stage. Tensile index increasedby 8 Nm/g and fibre length was reduced by 10 % in LC refining at 140 kWh/adtgross specific refin
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17

Herzkamp, Matthias [Verfasser], Thomas Akademischer Betreuer] Brückel, and Achim [Akademischer Betreuer] [Stahl. "Simulation and optimization of a position sensitive scintillation detector with wavelength shifting fibers for thermal neutrons / Matthias Herzkamp ; Thomas Brückel, Achim Stahl." Aachen : Universitätsbibliothek der RWTH Aachen, 2016. http://d-nb.info/112987611X/34.

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18

Herzkamp, Matthias Verfasser], Thomas [Akademischer Betreuer] Brückel, and Achim [Akademischer Betreuer] [Stahl. "Simulation and optimization of a position sensitive scintillation detector with wavelength shifting fibers for thermal neutrons / Matthias Herzkamp ; Thomas Brückel, Achim Stahl." Aachen : Universitätsbibliothek der RWTH Aachen, 2016. http://d-nb.info/112987611X/34.

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19

Cronauer, Tom, and Brian Eslinger. "REMOTE CONTROL OF TWO AXIS AUTO-TRACKING TELEMETRY ANTENNAS." International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/606827.

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International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>Due to Cost and Safety considerations the Range Division of the 412th Test Wing is upgrading remote telemetry (TM) antenna sites to be operated and monitored remotely. This is possible, in part, due to the installation of fiber optic cable, and the use of ATM communications protocol. Both of these applications significantly reduce signal latency from the remote control station located at Ridley Mission Control Center (RMCC) and the Antenna site. This paper di
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20

Pereira, David de Paulo. "Análise não linear geométrica de sólidos elásticos tridimensionais reforçados com fibras através do método dos elementos finitos." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-02022016-083316/.

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O presente trabalho tem por finalidade estudar e implementar um modelo numérico de análises cinemáticas de sólidos tridimensionais via método dos elementos finitos posicionais, com consideração de fibras longas ou curtas inseridas de maneira aleatória ou não no domínio da análise. O modelo numérico considera material isotrópico para a matriz e não linearidade geométrica. O domínio do sólido é discretizado por meio de elementos finitos tetraédricos de ordem qualquer, cujos parâmetros nodais são suas posições. A medida de deformação utilizada é a de Green, associada à lei constitutiva de Saint-V
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21

Fanelli, Andrea. "Two structural aspects in birational geometry : geography of Mori fibre spaces and Matsusaka's theorem for surfaces in positive characteristic." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/26285.

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The aim of this thesis is to investigate two questions which naturally arise in the context of the classification of algebraic varieties. The first project concerns the structure of Mori fibre spaces: these objects naturally appear in the birational classification of higher dimensional varieties and the minimal model program. We ask which Fano varieties can appear as a fibre of a Mori fibre space and introduce the notion of fibre-likeness to study this property. This turns out to be a rather restrictive condition: in order to detect this property, we obtain two criteria (one sufficient and one
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22

Gaumont, E. "Minimisation de l'influence d'une fluctuation de temperature, comprise entre 77k et 460k, sur la polarisation dans une fibre optique monomode. Application a un capteur de position angulaire." Université Louis Pasteur (Strasbourg) (1971-2008), 2000. http://www.theses.fr/2000STR13195.

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Cette these concerne l'etude des proprietes de polarisation de la lumiere dans une fibre optique monomode. L'objectif principal est de reduire l'impact d'une variation de temperature sur un capteur polarimetrique a fibre optique. L'evolution de la polarisation le long de la fibre resulte de la presence de birefringences intrinseques liees a la fabrication. Nous avons egalement considere des birefringences extrinseques de courbure et de torsion, puis la variation thermique de l'ensemble des birefringences, pour constituer, dans le formalisme de la sphere de poincare, un modele applique a un cap
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23

MANCIER, NATHALIE. "Etude de la birefringence induite par contrainte externe dans une fibre optique entre -250c et +80c. Application a la realisation d'un capteur de position angulaire a basse temperature." Université Louis Pasteur (Strasbourg) (1971-2008), 1995. http://www.theses.fr/1995STR13094.

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Le travail presente dans cette these concerne les proprietes de polarisation de la lumiere dans une fibre optique et a leur application a la realisation de capteurs. L'etude theorique des phenomenes de birefringence induite par contrainte dans une fibre a permis d'etablir un modele analytique des capteurs polarimetriques a fibre optique, base sur la representation de la sphere de poincare. Il est ainsi possible de definir les caracteristiques d'un capteur polarimetrique et d'optimiser ses parametres avant la phase experimentale. Nous avons aussi evalue l'influence de la temperature sur ce type
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24

Mohebbi-Kalhori, Davod. "Le développement et la modélisation numérique d'un bioréacteur pour l'ingénierie des tissus de grande masse." Thèse, Université de Sherbrooke, 2008. http://savoirs.usherbrooke.ca/handle/11143/1909.

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This present thesis comprise two major parts both experimental and numerical study which have been conducted in four distinct steps as following: (1) Design, construction, and evaluation of control and hydrodynamic of a bioreactor system. (2) Visualization of fluid flow perfusion in the hollow fibre membrane bioreactor (HFMB) using a biomedical noninvasive imaging technique, i.e. positron emission tomography (PET). (3) Development of a mathematical model for analyzing a hybrid hollow fibre membrane bioreactor (hHFMB) and (4) Development of a dynamic and two-porous media model for analyzing the
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25

Fernandes, Victor Alves. "Análise elastoplástica bidimensional de meios reforçados com fibras." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-03062016-111146/.

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De modo a satisfazer aspectos de resistência, custo ou conforto, o aperfeiçoamento do desempenho das estruturas é uma meta sempre almejada na Engenharia. Melhorias têm sido alcançadas dado ao crescente uso de materiais compósitos, pois estes apresentam propriedades físicas diferenciadas capazes de atender as necessidades de projeto. Associado ao emprego de compósitos, o estudo da plasticidade demonstra uma interessante alternativa para aumentar o desempenho estrutural ao conferir uma capacidade resistente adicional ao conjunto. Entretanto, alguns problemas podem ser encontrados na análise elas
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26

Posterlli, Mariana Corrêa. "Modelagem da expansão devido à reação álcali-agregado de concreto armado e reforçado com fibras." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-07032017-111040/.

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A reação álcali-agregado (RAA) é uma reação química complexa envolvendo os álcalis presentes no cimento Portland e minerais silicosos presentes em alguns tipos de agregados reativos. O produto dessa reação expande quando em contato com a água, causando fissuração e deformação, o que afeta a durabilidade e importantes propriedades mecânicas das estruturas de concreto. Entretanto, estruturas que estejam sob tensão de compressão, aplicada por carregamentos ou induzida pela presença de armadura, apresentam expansão reduzida na direção comprimida. Uma das ferramentas que se utiliza para a previsão
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27

Chang, Chieh-Hsi, and 張傑熙. "Rotating Angle Position Sensor Based on Fiber Bragg Grating with Cylindrical Cantilever Beam." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/78199177647184015090.

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碩士<br>逢甲大學<br>電機工程所<br>100<br>In this thesis two different rotating angle sensing structures based on fiber Bragg gratings with characteristics of excellent linearity, fine measuring resolution, nice stability, negligible hysteresis phenomenon, and arbitrary random rotational angle detection are proposed. The first kind of sensor is composed of optical gratings and a cantilever. In which two fiber Bragg gratings(FBGs) with different wavelengths are uniformly glued on the cantilever. A metal cylinder is fixed on the rotor to make cantilever beam have an initial bending, and sinusoidal shifts of
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28

Hsu, Kuei-Chu, and 徐桂珠. "Fiber Bragg Grating Sequential UV-Writing with Real-Time Interferometric Side-Diffraction Position Monitoring." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/64759664275257483967.

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博士<br>國立交通大學<br>光電工程系所<br>95<br>In this dissertation we develop a new real-time fiber position monitoring method for fiber Bragg grating (FBG) sequential UV-writing processes. To real-time accurately align the position of every exposed FBG, a single-period reference fiber grating is probed by applying an interferometric side-diffraction method to measure the grating phase as the position reference, so that the writing process can be less sensitive to the measurement drifts. During the research we have also calibrated carefully the nonlinear relationship between the UV flux and the induced inde
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Lu, Chien-Hung, and 盧建宏. "All-positive-dispersion Yb-doped Femtosecond Fiber Laser." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/60309544040600013263.

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碩士<br>國立交通大學<br>影像與生醫光電研究所<br>101<br>In this research, we use the polarization additive pulse mode-lock (PAPM) to achieve passive mode-locking and successfully manufacture a mode-locked ytterbium-doped fiber (YDF) oscillator. When the launched pump power is 280 mW, the properties of the output laser are:center wavelength 1064 nm、14.68MHz repetition rate、average output power 4.8 mW and 24.6 ps pulse width. All single-mode fiber laser system is present in this research , this system is expected to encounter material dispersion that would induce the phenomenon of pulse spread. We use dispersi
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LIU, XIA-WENG, and 劉祥榮. "Voltage controlled optical fiber coupler using positive dielectric anisotropy liquid crystal layer." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/88420000855832832368.

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31

(7038068), Nelyan Lopez-Perez. "Detection of Early Stages of Degradation on PPTA Fibers Through the Use of Positron Annihilation Lifetime Spectroscopy." Thesis, 2019.

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<p>High-performance fibers used for ballistic protection are characterized by having outstanding mechanical properties such high modulus and strength. These mechanical properties are granted by the fiber’s chemical and physical structure as well as their high degree of orientation. Twaron fibers are one of the most commonly used fibers on soft body armors such as bulletproof vests. They are made from poly (p-phenylene terephthalamide) (PPTA), a rigid-rod and highly crystalline polymer. Although these fibers are crystalline and have great mechanical properties, their performance can decrease wh
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32

Santos, Rafael Alexandre Mota dos. "Effect of the Distance Between Impact Point and Hole Position and Non-Perpendicular Holes on the Impact Strength of Composite Laminates." Master's thesis, 2016. http://hdl.handle.net/10400.6/7703.

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The effect of the distance between impact point and hole position and the angle of the hole with the vertical axis was studied. In order to understand this effect, flexural tests were also performed to evaluate the bending strength of CFRP. In terms of distance of the hole, a maximum reduction of 29.7% on the bending load for a distance of 0 mm was found. This reduction was 22.3% on the impact load. In terms of angle of the hole, a maximum load reduction of 15.6% on the bending strength was found and for the impact load this value was found to be 7% for 20º. The fatigue resistance was also stu
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Heath, Stuart James. "Observations of the flow of a semi-dilute fibre suspension through a sudden expansion using positron emission tomography." Thesis, 2006. http://hdl.handle.net/2429/18739.

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The motion of ¹⁸F radioactively labeled papermaking fibres flowing through an axisymmetric 1:5 sudden expansion has been studied using positron emission tomography (PET). Various length fractions of a mechanical pulp were radioactively labeled and then introduced into a non-radioactive aqueous 0.4 wt. % (consistency) wood pulp suspension. Fully three-dimensional images were reconstructed both upstream and downstream of the expansion plane for cases in which the upstream velocity U was set from 0.5 to 0.9 m/s (an approximate Reynolds number range of 7,000 to 13,000). Two distinct flow regimes w
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34

Eppley, Geary W. "Simulating Z' boson going to positron electron events at sqrt.s = 40 TeV to evaluate a proposed silicon-scintillating fiber tracking system for SDC." Thesis, 1992. http://hdl.handle.net/1911/13668.

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Computer simulation is used to study the ability of a proposed silicon-scintillating fiber tracking system for SDC to correctly interpret $Z\sp\prime\to e\sp+e\sp-$ events. Two versions of the Lund Monte Carlo model for inelastic non-diffractive events are compared to existing data and then evaluated at $\sqrt{s}=40$ TeV. We use the two versions to generate the associated particles in $Z\sp\prime\to e\sp+e\sp-$ events and find that the predicted occupancy in the proposed tracking system varies by $\approx$50% between the two versions. The tracking system is able to reconstruct the $e\sp+e\sp-$
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