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Dissertations / Theses on the topic 'Instability constant'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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1

Tyagi, P. K. "Linear Instability Of Laterally Strained Constant Pressure Boundary Layer Flows." Thesis, Indian Institute of Science, 2001. https://etd.iisc.ac.in/handle/2005/265.

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The linear instability of laterally diverging/converging flows is an important aspect towards understanding the laminar-transition process in many viscous flows. In this work the linear instability of constant pressure laterally diverging/converging flow has been investigated. The laminar velocity field for laterally diverging/converging flows, under the source/sink approximation, has been reduced to two-dimensional flows. This reduction is alternative to the Mangier transformation used earlier. For a constant pressure laterally strained flow, the laminar velocity is found to be governed by

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2

Tyagi, P. K. "Linear Instability Of Laterally Strained Constant Pressure Boundary Layer Flows." Thesis, Indian Institute of Science, 2001. http://hdl.handle.net/2005/265.

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The linear instability of laterally diverging/converging flows is an important aspect towards understanding the laminar-transition process in many viscous flows. In this work the linear instability of constant pressure laterally diverging/converging flow has been investigated. The laminar velocity field for laterally diverging/converging flows, under the source/sink approximation, has been reduced to two-dimensional flows. This reduction is alternative to the Mangier transformation used earlier. For a constant pressure laterally strained flow, the laminar velocity is found to be governed by t

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3

Bahadornejad, Momen. "On-line local load measurement based voltage instability prediction." Thesis, Queensland University of Technology, 2005. https://eprints.qut.edu.au/16187/1/Momen_Bahadornejad_Thesis.pdf.

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Voltage instability is a major concern in operation of power systems and it is well known that voltage instability and collapse have led to blackout or abnormally low voltages in a significant part of the power system. Consequently, tracking the proximity of the power system to an insecure voltage condition has become an important element of any protection and control scheme. The expected time until instability is a critical aspect. There are a few energy management systems including voltage stability analysis function in the real-time environment of control centres, these are based on assu

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4

Bahadornejad, Momen. "On-line local load measurement based voltage instability prediction." Queensland University of Technology, 2005. http://eprints.qut.edu.au/16187/.

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Voltage instability is a major concern in operation of power systems and it is well known that voltage instability and collapse have led to blackout or abnormally low voltages in a significant part of the power system. Consequently, tracking the proximity of the power system to an insecure voltage condition has become an important element of any protection and control scheme. The expected time until instability is a critical aspect. There are a few energy management systems including voltage stability analysis function in the real-time environment of control centres, these are based on assump

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5

Wu, Mingfei. "Active Methods for Addressing the Instability Problem between Constant Power Loads and their LC Input Filters in DC Power Systems." Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/13938.

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Constant power loads (CPLs) have negative impedance characteristic. This characteristic can degrade the stability margin of the whole system when the CPL operates with other circuits, typically, an LC input filter. The stability of the CPL and the LC input filter can be determined by the impedance stability criterion. Many active methods have been proposed to stabilize the interaction between LC input filters and CPLs. Compared with the mature study of active methods for stabilization of inverter based CPLs and LC input filters, there are few active methods proposed for stabilization of DC/DC

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6

Nguyen, Kien Trung. "Etude expérimentale du comportement instable d'un sable silteux : application aux digues de protection." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4709/document.

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Les matériaux constitutifs des digues sont souvent des sables silteux dont le comportement mécanique peut manifester une « instabilité » à des états de contraintes situés bien avant la limite de plasticité de Mohr-Coulomb. Ce mécanisme de rupture pourrait expliquer plusieurs brèches dont l'occurrence n'a pas été attribuée aux mécanismes classiques de rupture de digues telle que l'érosion interne. L'objectif de cette thèse est de mieux comprendre, au regard de ce phénomène d'instabilité, le comportement mécanique d'un sable silteux provenant de la zone adjacente à une brèche de digue du Rhône l

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7

Yogi, Leda Shizuka. "Estudo comparativo entre métodos de avaliação funcional do ombro nas cirurgias de descompressão subacromial e capsuloplastia: avaliação de 60 pacientes com os métodos ASES, CONSTANT, ROWE, SF-36, SST e UCLA shoulder rating." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/5/5140/tde-30052007-152653/.

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Realizamos estudo prospectivo randomizado para comparar cinco métodos específicos de avaliação funcional do ombro e uma avaliação genérica da saúde em pacientes operados de capsuloplastia e descompressão subacromial associado à reparação do manguito rotador. Foram estudados 30 pacientes de cada grupo, avaliados no período entre cinco a seis meses após o tratamento cirúrgico com os questionários dos Cirurgiões Americanos de Ombro e Cotovelo(ASES), Sistema de Pontuação do Ombro de Constant & Murley (CONSTANT), Folha de Classificação da Reparação de Bankart (ROWE), Teste Simples de Ombro (SST), E

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8

Гапон, Юліана Костянтинівна. "Функціональні покриття тернарними сплавами кобальту з тугоплавкими металами". Thesis, НТУ "ХПІ", 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/27602.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.17.03 – технічна електрохімія. – Національний технічний університет "Харківський політехнічний інститут", м. Харків, 2017 р. Дисертацію присвячено розробці технології гальванохімічного синтезу покриттів тернарними сплавами кобальт-молібден-вольфрам з полілігандних електролітів для одержання матеріалів з поліпшеними фізико-механічними властивостями. Визначено константи нестійкості та склад моно- та білігандних комплексів кобальту та запропоновано цитратно-дифосфатну та амонійно-цитратну системи для осадження

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9

Гапон, Юліана Костянтинівна. "Функціональні покриття тернарними сплавами кобальту з тугоплавкими металами". Thesis, НТУ "ХПІ", 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/27601.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.17.03 – технічна електрохімія. – Національний технічний університет "Харківський політехнічний інститут", м. Харків, 2017 р. Дисертацію присвячено розробці технології гальванохімічного синтезу покриттів тернарними сплавами кобальт-молібден-вольфрам з полілігандних електролітів для одержання матеріалів з поліпшеними фізико-механічними властивостями. Визначено константи нестійкості та склад моно- та білігандних комплексів кобальту та запропоновано цитратно-дифосфатну та амонійно-цитратну системи для осадження

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10

Renaudière, de Vaux Sébastien. "Convection thermique en présence d'un champ magnétique constant, alternatif, ou d'une source de chaleur dispersée." Phd thesis, Toulouse, INPT, 2017. http://oatao.univ-toulouse.fr/19752/1/renaudiere.pdf.

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On s’intéresse dans ce travail à la convection thermique en présence de champ magnétique, en lien avec les essais Vulcano du CEA de Cadarache. Ces essais ont pour but de reproduire en laboratoire les écoulements générés par un chauffage volumique dues aux matières radioactives issues d’accidents nucléaires. Le chauffage par induction électromagnétique de ces fluides permet de simuler en laboratoire la puissance volumique des désintégrations nucléaires en évitant l’utilisation de matériaux radioactifs. Néanmoins, ce forçage électromagnétique génère un couplage entre l’écoulement fluide et le ch

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11

Cariolle, Joël. "Export instability, corruption and how the former influences the latter." Thesis, Clermont-Ferrand 1, 2013. http://www.theses.fr/2013CLF10419.

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Cette thèse a pour objectif d’approfondir l’analyse des conditions d’émergence et d’incidence de la corruption dans le monde. Nous y soulignons une dimension importante mais jusque-La peu documentée des activités de corruption, à savoir, leur contribution aux stratégies informelles d’adaptation et de gestion du risque mises en place par les agents économiques pour se protéger contre l’instabilité de leur revenu. Le premier chapitre propose un état des lieux de la recherche sur les définitions, les mesures, les typologies et les déterminants de la corruption. Dans le deuxième chapitre, les méth

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12

Laghmach, Rabia. "Modélisation de la cristallisation des élastomères sous sollicitation mécanique par champ de phase." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0061/document.

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La cristallisation induite par déformation des élastomères est un processus cinétique qui conduit à la formation de nano-cristallites thermodynamiquement stables. La présence de ces nano-cristallites au sein de la phase amorphe modifie considérablement les propriétés mécaniques des élastomères cristallisables. Ces élastomères ont en effet la propriété intéressante d'être auto-renforçants. L’objectif de ce travail est de développer un modèle physique capable de décrire localement l’évolution de la microstructure sous l’effet d’un champ de contrainte élastique durant la cristallisation. Dans ce

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13

Asker, Christian. "Effects of disorder in metallic systems from First-Principles calculations." Doctoral thesis, Linköpings universitet, Teoretisk Fysik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-53584.

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In this thesis, quantum-mechanical calculations within density-functional theory on metallic systems are presented. The overarching goal has been to investigate effects of disorder. In particular, one of the properties investigated is the bindingenergy shifts for core electrons in binary alloys using different theoretical methods. These methods are compared with each other and with experimental results. One such method, the so-called Slater-Janak transition state method relies on the assumption that the single-particle eigenvalues within density-functional theory are linear functions of their

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14

Guo, Wei-Zheng, та 郭偉政. "The Instability of Asymmetric α-Si:H TFTs under Different Voltage Stress and Constant Current Stress". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/95201036142905016726.

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碩士<br>國立中興大學<br>電機工程學系所<br>98<br>The hydrogenated amorphous silicon thin-film transistors (a-Si:H TFTs) were important electronic devices in many electronic products. The a-Si:H TFT technology in active-matrix liquid-crystal displays (AM-LCD) was applied to new products recent years, the active-matrix organic light emitting displays (AM-OLED). We investigated the asymmetric TFT electrical characteristics under different voltage stress and constant current stress because TFTs would be used as current driver. The instability of voltage stress: We made the experiments about DC stress and AC s

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15

Buckley, John G., Vijay Anand, Andy J. Scally, and David B. Elliott. "Does head extension and flexion increase postural instability in elderly subjects when visual information is kept constant?" 2005. http://hdl.handle.net/10454/6402.

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The present study determined the effects of flexing and extending the head on the postural stability and mean anterior-posterior (A-P) center of mass (CM) position during upright stance in the elderly. To ensure visual input to stability was not a confounding variable, visual information was kept as constant as possible for all head positions. Twelve healthy elderly subjects (72.3±4.7 years) were asked to stand stationary on a single force-platform. Postural stability (assessed using the rms A-P excursion of the center of pressure (CP)) was determined for standing with the head erect, and with

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16

Kuchibhatla, Sarat Chandra. "Experimental Investigation of the Effect of Initial Conditions on Rayleigh-Taylor Instability." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8469.

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An experimental study of the effect of initial conditions on the development of Rayleigh Taylor Instabilities (RTI) at low Atwood numbers (order of 10-4) was performed in the water channel facility at TAMU. Initial conditions of the flow were generated using a controllable, highly reliable Servo motor. The uniqueness of the study is the system’s capability of generating the required initial conditions precisely as compared to the previous endeavors. Backlit photography was used for imaging and ensemble averaging of the images was performed to study mixing width characteristics in different reg

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17

HUANG, RONG-TAI, and 黃榮泰. "The study of incipient instability criterion for two superposed fluid with varied boundary constraint." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/37265633781797480396.

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