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73 articles for “Instability”
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Research ArticleOpen accessIn the keywordsPhysical and Geometrical Effects on the Vibratory Pattern of a Pipe Carrying Fluid FlowDahmane Mouloud, Samir Zahaf, Mawhoub Soubih et al.In this research, the first natural frequencies and critical velocities of a fluid flow-conveying pipe are obtained with finite element method. By discretizing the structure wall and fluid flow, starting from beam type with two degrees of freedom per node. We determine the equation of motion from the fluid-structure coupling using Lagrange energy principle. Parameters frequencies and critical velocity of … …Current Research in Bioinformatics, Vol. 9, Issue 1 · 22 Oct 2020 · 11,396 accessesView PDFCite
Research ArticleOpen accessIn the keywordsNumerical Study of Post-Buckling of Clamped-Pinned Pipe Carrying Fluid Under Different ParametersDahmane Mouloud, Samir Zahaf, Mawhoub Soubih et al.This research aims to calculate the first three natural frequencies and critical velocity of a fluid-conveying pipe are obtained with numerical approach with standard finite element method and this by discretizing the structure wall and internal flow, starting from beam type with two degrees of freedom per node. The determination is done to the vibrational equation from the fluid-structure coupling … …Current Research in Bioinformatics, Vol. 9, Issue 1 · 21 Sep 2020 · 12,076 accessesView PDFCite
Research ArticleOpen accessIn the keywordsProcessability of Bulk Metallic GlassesRaffaella Aversa, Daniela Parcesepe, Relly Victoria V. Petrescu et al.Microfluidic Shear Flow Instabilities in Injection Molded Glassy Metal are investigated. The formation of microfluidic shear flows instabilities involving the presence of different viscosities fluids has been observed in injection molded Bulk Metallic Glasses. The complex rheology of injection molded metastable glassy metal, which has been hypothesized to induce selective clustering of atoms of different steric hindrance, is discussed. Smaller … …American Journal of Applied Sciences, Vol. 14, Issue 2 · 15 Feb 2017 · 7,487 accessesView PDFCite
Research ArticleOpen accessIn the keywordsCOMPARATIVE STUDY OF DIFFERENT KALMAN FILTER IMPLEMENTATIONS IN POWER SYSTEM STABILITYH. H. Goh, C. W. Tai, Q. S. Chua et al.Voltage stability and voltage collapse issues have in recent years begun to constitute an unpleasant warning to the operational security of power systems. Many techniques have been investigated in order to predict the point of voltage collapse. However, there are still several restrictions due to the insufficiency of current system state information. Accompanied by the commencement of the Phasor Measurement … …American Journal of Applied Sciences, Vol. 11, Issue 8 · 29 May 2014 · 7,190 accessesView PDFCite
Research ArticleOpen accessIn the keywordsA Model for Congestion Control of Transmission Control Protocol in Mobile Wireless Ad Hoc NetworksAdib M. Monzer Habbal, Suhaidi HassanTransmission Control Protocol (TCP) is a fundamental protocol in the TCP/IP Protocol Suite.TCP was well designed and optimized to work over wired networks where most packet loss occurs due to network congestion. In theory, TCP should not care whether it is running over wired networks, WLANs, or Mobile Ad hoc Networks (MANETs). In practice, it does matter because most TCP … …Journal of Computer Science, Vol. 9, Issue 3 · 24 Apr 2013 · 7,373 accessesView PDFCite
Research ArticleOpen accessIn the keywordsMathematical Model Predicting the Critical Heat Flux of Nuclear ReactorsChien-Hsiung Lee, Lih-Wu Hourng, Kuo-Wei LinBoiling heat transfer system keeps a nuclear power plant safe without getting over-heated. Crisis will occur if the dissipated heat flux exceeds the critical heat flux value. This study assumes the flow boiling system at high heat flux is characterized by the existence of a very thin liquid layer, known as the &#34sublayer&#34, which is trapped between the heated surface … …Journal of Computer Science, Vol. 8, Issue 12 · 12 Dec 2012 · 7,695 accessesView PDFCite
Research ArticleOpen accessIn the keywordsFree Enterprise and Entrepreneurship in Serbia: An Analysis of Motivations, Financing and ObstaclesNina Radojevich-KelleyProblem statement: Entrepreneurship is considered to be a major driving force to economic development throughout the world. Free enterprise is challenging in any country, especially in a developing nation such as Serbia where communism and socialism prevailed for decades. The purpose of this study is to examine entrepreneurship and free enterprise in Serbia as well as the challenges or obstacles … …American Journal of Economics and Business Administration, Vol. 3, Issue 2 · 21 Apr 2011 · 8,046 accessesView PDFCite
Research ArticleOpen accessIn the keywordsThe Application of Multi-Agent Technology on Transient Stability Assessment of Iraqi Super Grid NetworkAfaneen A. Abood, Ahmed N. Abdalla, Shant K. AvakianThe aim of this research is improving the Iraqi control center's capabilities for monitoring and controlling the electrical network by adopting the properties of multi-agent technology to enhance power system transient stability. The idea was demonstrated by two agent's strategy, the first agent is a prediction one that will predict power system instability by a transient stability program using the … …American Journal of Applied Sciences, Vol. 5, Issue 11 · 30 Nov 2008 · 7,321 accessesView PDFCite
Research ArticleOpen accessIn the keywordsPolitical Stability and Economic Growth in AsiaMuhammad Younis, Xu Xiao Lin, Yahya Sharahili, Santhirasegaram SelvarathinamThis study investigates the effects of various factors of political instability on economic growth in selected ten Asian economies during 1990-2005. Our empirical findings show a close relationship between political stability and economic growth. We have analyzed the data by using ordinary least squire econometrics methods, which conclude that 32.35 scores increasing of index of political stability leads to one … …American Journal of Applied Sciences, Vol. 5, Issue 3 · 31 Mar 2008 · 8,556 accessesView PDFCite
Research ArticleOpen accessIn the keywordsNumerical Study of Static and Dynamic Instabilities of Pinned-Pinned Pipe under Different ParametersDahmane Mouloud, Zahaf Samir, Benkhettab Mohamed, Boutchicha DjilaliIn this study, the natural frequencies of the pipe transporting an fluid resting on an elastic Winkler-type and the critical velocities of instabilities are obtained by the standard finite element method. A dynamic characteristic of a pipe carrying internal fluid undergoes mechanical load due to inertia effect of fluid, Coriolis force, fluid kinetic force due to fluid flow velocity, dynamic … …American Journal of Engineering and Applied Sciences, Vol. 13, Issue 4 · 21 Nov 2020 · 7,004 accessesView PDFCite