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Dissertations / Theses on the topic 'Propagation length'

Author: Grafiati

Published: 4 June 2021

Last updated: 3 February 2022

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1

Li, Huanlin. "Studies on Lowering the Error Floors of Finite Length LDPC codes." Ohio University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1305126490.

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2

Smith, Gregory Brian. "Investigations into the effects of chain-length-dependent termination and propagation on the kinetics of radical polymerisation." Thesis, University of Canterbury. Chemistry, 2008. http://hdl.handle.net/10092/1455.

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Radical polymerisation (RP) has for many years been an industrially important process, and the kinetics of the process remains an active area of research. As polymerisation proceeds, converting monomer (small molecules) into polymer (long chain molecules), chemical species of a variety of chain lengths are produced. Recent work has pointed toward the fact that rate coefficients for polymerisation reactions (specifically, termination and propagation) are often dependent on the chain-length of the reacting species. The focus of this thesis is to study the effects of chain-length-dependent reacti

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3

Raj, Piyush. "Influence of Fuel Inhomogeneity and Stratification Length Scales on Detonation Wave Propagation in a Rotating Detonation Combustor (RDC)." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/103185.

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The detonation-based engine has the key advantage of increased thermodynamic efficiency over the traditional constant pressure combustor. These detonation-based engines are also known as Pressure Gain Combustion systems (PGC) and Rotating Detonation Combustor (RDC) is a form of PGC, in which the detonation wave propagates azimuthally around an annular combustor. Prior researchers have performed a high fidelity 3-D numerical simulation of a rotating detonation combustor (RDC) to understand the flow physics such as detonation wave velocity, pressure profile, wave structure; however, performing t

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4

Song, Mingxia. "Surface plasmon propagation in metal nanowires." Thesis, Dijon, 2012. http://www.theses.fr/2012DIJOS053/document.

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Pas de résumé en français<br>Plasmonic circuitry is considered as a promising solution-effectivetechnology for miniaturizing and integrating the next generation ofoptical nano-devices. The realization of a practical plasmonic circuitry strongly depends on the complete understanding of the propagation properties of two key elements: surface plasmons and electrons. The critical part constituting the plasmonic circuitry is a waveguide which can sustain the two information-carriers simultaneously. Therefore, we present in this thesis the investigations on the propagation of surface plasmons and th

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5

Song, Mingxia. "Propagation des plasmons de surface dans des nanofils métalliques." Phd thesis, Université de Bourgogne, 2012. http://tel.archives-ouvertes.fr/tel-00842236.

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Plasmonic circuitry is considered as a promising solution-effectivetechnology for miniaturizing and integrating the next generation ofoptical nano-devices. The realization of a practical plasmonic circuitry strongly depends on the complete understanding of the propagation properties of two key elements: surface plasmons and electrons. The critical part constituting the plasmonic circuitry is a waveguide which can sustain the two information-carriers simultaneously. Therefore, we present in this thesis the investigations on the propagation of surface plasmons and the co-propagation of surface p

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6

Lefrancois, André. "Propagation par fatigue de fissures bi et tridimensionnelles dans deux alliages d'aluminium : effets de petite fissure et de chargements aleatoires." Paris, ENMP, 1987. http://www.theses.fr/1987ENMP0089.

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Comparaison du comportement des fissures courtes (inferieures a 0,3-0,4mm) et longues dans deux alliages d'aluminium 2124 et 7475 soumis a deux types de chargement : sollicitations d'amplitude constante, sollicitations incluant des surcharges uniques ou repetees periodiquement

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7

Fabregue, Pascal. "Debut de propagation de fissures de fatigue dans un superalliage base nickel de metallurgie des poudres." Paris, ENMP, 1987. http://www.theses.fr/1987ENMP0033.

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Etude des proprietes de fatigue des superalliages contenant des inclusions de type ceramique. Determination, a temperature ambiante, des cinetiques de debut de propagation de fissures a partir des defauts presents dans la structure. Mise en evidence, d'un effet de "fissure courte". Il est demontre que deux parametres jouent un role, essentiel dans la differenciation des cinetiques de propagation des fissures courtes et longues : le caractere tridimentionnel des fissures naturelles et le phenomenes de fermeture de fissures

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8

Zeghloul, Abderrahim. "Comparaison de la propagation en fatigue des fissures courtes et des fissures longues." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37619253w.

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9

YAMAMOTO, Kazuhiro, Hiroshi YAMASHITA, and Jilin HAN. "Numerical Study on Spark Ignition Characteristics of Methane-air Mixture Using Detailed Chemical Kinetics : Effect of Electrode Temperature and Energy Channel Length on Flame Propagation and Relationship between Minimum Ignition Energy and Equivalence Ratio." The Japan Society of Mechanical Engineers and The Heat Transfer Society of Japan, 2009. http://hdl.handle.net/2237/19812.

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10

Barbosa, José Fernando Cárdenas. "Fatigue crack propagation in AA 7050-T7451 alloy considering environment, stress ratio, rolling direction and waveform effects." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/18/18158/tde-27062017-111140/.

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Main extrinsic and intrinsic modifiers factors of crack growth rate in AA7050-T7451 were assessed in order to provide tools for aeronautical structures designers. These tools cover most necessary information to project aircraft\'s structures using the studied alloy, under damage tolerance philosophy. The experimental methodology consisted of use CT specimens, on TL and LT rolling direction to test its behavior under different conditions of stress ratio, force waveform, and the environment. The stress ratio values were 0.1 and 0.5, the force waveform used were sine and trapezoidal or Dwell unde

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11

Ben, Gdara Sarra. "Etude des déclenchements intempestifs des produits différentiels." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENT032.

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Le Disjoncteur Différentiel Résiduel (DDR) doit garantir la continuité de service ce qui signifie qu'aucun défaut autre que ceux pouvant mettre l'utilisateur en danger ne doivent faire déclencher le produit pour éviter soit des désagréments (non alimentation du congélateur) soit une perte financière (non exploitation d'une installation photovoltaïque).La fonction mesure est composée de :- Un tore pour la mesure du courant résiduel, il réalise naturellement la somme des courants entrant et sortant de l'installation- Une plaquette de mise en forme (filtrage)- Un actionneur, le relais polarisé qu

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12

Rasolofosaon, Patrick N. J. "Propagation des ondes acoustiques dans les milieux poreux : effets d'interface, experiences et theorie." Paris 7, 1987. http://www.theses.fr/1987PA077151.

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Une premiere partie theorique expose en detail la propagation des ondes acoustiques dans les milieux poreux a travers le modele poroviscoelastique. On montre que les effets poroelastiques ne sont superieurs aux effets viscoelastiques qui en presence de discontinuites physiques ou d'echange hydraulique entre differents milieux. Trois experiences dans la deuxieme partie, celle de plona, resonance des modes de lamb, propagation d'ondes a l'interface roche fluide. Dans la troisieme partie, on envisage l'inversion des mesures acoustiques

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13

Kaddour, Mohsen. "Contribution à la modélisation d'un coupleur actif à onde lente en lignes de transmission à contact métal-semiconducteur." Toulouse, INPT, 1987. http://www.theses.fr/1987INPT034H.

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Analyse de la propagation des ondes lentes ainsi que de leur couplage interlignes dans une structure metal semiconducteur couramment utilisee dans les circuits microondes. La structure utilisee est un mesfet bigrille qui sera modelise

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14

Saulay, Jean-Philippe. "Influence des états de surface sur la propagation lente des fissures de corrosion sous contrainte : Comportement des alliages 600 et 690 en milieu primaire." Grenoble INPG, 2002. http://www.theses.fr/2002INPG0017.

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15

Aichele, Johannes. "Elastic waves in complex conditions : from the onset of rupture to viscous dispersion in foams." Electronic Thesis or Diss., Lyon, 2019. http://www.theses.fr/2019LYSE1217.

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Ces travaux s'inscrivent dans la continuité des recherches académiques du Labtau (Laboratory of therapeutic applications of ultrasound) et de l’ ISTerre (Institut des sciences de la terre) à l'interface entre imagerie médicale et sismologie, deux disciplines reposant sur la propagation des ondes élastiques. La nature de la propagation des ondes élastiques dans des milieux complexes est étudiée à travers l'imagerie ultrasonore ultrarapide - également connue sous le nom d'imagerie d’ondes de cisaillement. Cette technique d'imagerie médicale permet de récupérer un champ d'onde de cisaillement se

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16

RAJAIE, TARANNOM. "BELIEF PROPAGATION DECODING OF FINITE-LENGTH POLAR CODES." Thesis, 2012. http://hdl.handle.net/1974/6996.

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Polar codes, recently invented by Arikan, are the first class of codes known to achieve the symmetric capacity for a large class of channels. The symmetric capacity is the highest achievable rate subject to using the binary input letters of the channel with equal probability. Polar code construction is based on a phenomenon called channel polarization. The encoding as well as the decoding operation of polar codes can be implemented with O(N logN) complexity, where N is the blocklength of the code. In this work, we study the factor graph representation of finite-length polar codes and their eff

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17

YEN-YU, CHEN, and 陳彥佑. "Application of Back Propagation Neural Network on the Length of Stay Prediction for Cardiovascular Patients." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/bmkwv7.

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碩士<br>國立臺北科技大學<br>工業工程與管理系碩士班<br>103<br>The major concern for most hospitalists in Taiwan is to serve the aging population with the limited healthcare budget provided by the National Health Insurance Administration. As hospital beds are scarce, high occupancy rates are often preferred. To develop efficient admission policy and optimize bed management, it would be beneficial to investigate the critical factors which might determine the length of stay (LOS) in the early stage of admission. This research is to use artificial neural network (ANN) models to predict the LOS for patients in cardiolog

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18

Solis, David. "Bleach Imaged Plasmon Propagation (BlIPP) of Metallic Nanoparticle Waveguides." Thesis, 2013. http://hdl.handle.net/1911/72041.

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The high speed transfer of information in materials with dimensions below the sub-diffraction limit is essential for future technological developments. Metallic nanoparticle (NP) waveguides serve a unique role in efficient energy transfer in this size regime. Light may be confined to metallic structures and propagate along the surface of the waveguide via propagating plasmon waves known as surface plasmon polaritons (SPPs). Plasmon propagation of energy in metallic structures is not perfect however and damping losses from the waveguide material lead to a characteristic exponential decay in the

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19

Chih, Yong-Huei, and 池勇輝. "Measurement of Error Propagation Length from Speech Packet Loss and Studies of Its Real-time Communications Effects." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/56588329761724023710.

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碩士<br>元智大學<br>通訊工程學系<br>97<br>Packet loss is the most important quality degradation factor of real-time Voice over IP (VoIP) communications. This factor consists of two effects: Imperfect Packet Loss Concealment (IPLC) and IPLC associated Error Propagation (EP), where ignoring the latter will affect the accuracy of real-time VoIP packet importance. Thus, it is necessary to include the EP effect to enhance the accuracy of real-time packet importance with the cost of an extra encoding delay. This research studies the dilemma between the accuracy of packet importance and the realtime of communica

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20

Chou, Te-Hsin, and 周德昕. "Broadband Half-Width Microstrip Leaky-Wave Antenna Array with Shortened Length and Half-Width Microstrip Leaky-Wave Antenna Arrays with Varying-Periodicity Vias to Control the Propagation Characteristics." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/fbcw94.

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碩士<br>國立交通大學<br>電信工程研究所<br>103<br>In this thesis, we use the broadband tapered half-width microstrip leaky-wave antenna to be the unit element and design an eight element antenna array. We use the half-width structure to simplify the conventional feeding structure, which is 180°out of phase. In the half-width structure, the PEC wall is constructed by via holes conducting the two metallic layers on substrate. The advantages of this structure are: (I) simple feeding structure fed by microstrip line ; (II) pure mode excitation and no need to suppress mode ; (III) reduced size as compar

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21

Müller, Elena. "Detailed Investigations into the Propagation and Termination Kinetics of Bulk Homo- and Copolymerization of (Meth)Acrylates." Doctoral thesis, 2005. http://hdl.handle.net/11858/00-1735-0000-0006-B09E-8.

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22

Barth, Johannes. "Radical Polymerization Kinetics in Systems with Transfer Reactions Studied by Pulsed-Laser-Polymerization and Online EPR-Detection." Doctoral thesis, 2011. http://hdl.handle.net/11858/00-1735-0000-0006-B075-2.

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23

Zhen, Yurong. "Plasmonic properties and applications of metallic nanostructures." Thesis, 2013. http://hdl.handle.net/1911/72071.

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Plasmonic properties and the related novel applications are studied on various types of metallic nano-structures in one, two, or three dimensions. For 1D nanostructure, the motion of free electrons in a metal-film with nanoscale thickness is confined in its normal dimension and free in the other two. Describing the free-electron motion at metal-dielectric surfaces, surface plasmon polariton (SPP) is an elementary excitation of such motions and is well known. When further perforated with periodic array of holes, periodicity will introduce degeneracy, incur energy-level splitting, and facilitate

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