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131 articles for “Instabilities”
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Radiosonde Data Analysis for Predicting the Thunderstorm Potential Instabilities in Tropics
Abstract: The Gangetic belt of West Bengal of India is one of the most effective zones of atmospheric instabilities. The formation of the instabilities follows complex method whose clear understanding is very essential. The present work reports a model for its prediction system. The instabilities at the thunderstorms in the pre-monsoon and monsoon seasons for a period of two years exhibit interesting findings. Taking support of different meteorological parameters as derived …
Published in Research & Reviews : Journal of Space Science & Technology · Vol. 10, Issue 2, 2021 · pp. 11–21 Read article
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A Comparative Analysis of the Effectiveness of Rigid Tape Versus Kinesio Tape for Decreasing Pain and Increasing Strength in Chronic Ankle Instability Among Badminton Players
Abstract: Background: Badminton requires agility for a better performance. Sprain in the ankle is a common disability for badminton players. Inadequate rehabilitation leads to chronic ankle instability. Rigid and Kinesio taping are used to decrease pain and increase strength. Objective: To compare the effects of rigid and Kinesio tape in subjects with chronic ankle instability for decreasing pain and increasing strength. Procedures: In the Group I, 15 subjects were administered with …
Published in Research and Reviews: A Journal of Health Professions · Vol. 13, Issue 1, 2023 · pp. 35–42 Read article
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Simulation of Flow Vorticity and Instability Analysis in a Solid Rocket Motor
Abstract: Combustion instability is a major problem in most solid rocket motor (SRM) during its operation. More form of instability is generated due to several factors like coupling of combustion acoustic waves with flow dynamics, grain configuration, combustion chamber design, combustible mixture, etc. This type of flow turbulence is sustained in such system for long durations and leads to failure of the mission. In this paper, an effort has been made …
Published in Journal of Experimental & Applied Mechanics Read article
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Influence of Horizontal Crossflow on the Rayleigh-Taylor Instability: A Numerical Approach
Abstract: Rayleigh-Taylor Instability (RTI) is a typical occurrence in natural events, engineering, and industrial applications. When the lighter fluid (bottom medium) is forcing the heavier fluid (top medium) on top of the lighter fluid because of a gravitational field, then that phenomenon is called Rayleigh-Taylor instability (RTI). Despite extensive records of investigating this common phenomenon i.e., RTI with several unique boundary conditions, apparently, there are no prior investigations for the RTI …
Published in Research & Reviews : Journal of Physics · Vol. 14, Issue 1, 2025 · pp. 1–11 Read article
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Thermosolutal Instability of Partially Ionized Plasma in Porous Medium in Presence of Finite Larmor Radius and Hall Currents Effect
Abstract: The effects of finite Larmor radius (FLR), collisions, and Hall currents are investigated on thermosolutal instability of a partially ionized plasma in porous medium in the presence of a uniform vertical magnetic field. In the case of stationary convection, finite Larmor radius, Hall currents, medium permeability and magnetic field may have stabilizing or destabilizing effects but for a certain wave number range, FLR, magnetic field and Hall currents have stabilizing …
Published in Journal of Experimental & Applied Mechanics · Vol. 3, Issue 1, 2012 · pp. 32–46 Read article
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Designing and Analysis of a Negative Bias Temperature Instability Sensing Circuit
Abstract: Scale down the size of devices introduce the effect of negative bias temperature instability (NBTI), positive bias temperature instability (PBTI), and hot carrier injection (HCI) in very-large-scale integration (VLSI) chip design and the major concern is to minimize these effects to a nominal value. In the paper, authors focus in minimization of NBTI effect and develop a noble degradation monitoring sensor circuit named SCHIMOS. A comparison is stated between an …
Published in Research & Reviews: A Journal of Embedded System & Applications · Vol. 8, Issue 1, 2020 · pp. 6–11 Read article
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Design of Active Power Based Relay Algorithm to Overcome Transient Instability: 220 kV Amravati Substation Case Study
Abstract: This paper presents a new protective scheme, i.e. new relay algorithm to protect small scale generators against transient instability. The demand of installing small generators in distribution networks has been increased now-a-days. Small scale generators have low inertia constant. The inertia constant minimizes the frequency deviation which depends on the kinetic energy. Therefore frequency dynamics becomes slower and hence it increases the response time to react to fault events. Due …
Published in Journal of Power Electronics and Power Systems · Vol. 6, Issue 2, 2016 · pp. 64–73 Read article
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Thermal Instability in a Second-Order Fluid under the Effects of Suction-Injection-Combination and Maxwell-Cattaneo Law
Abstract: AbstractThe onset of Rayleigh-Bénard convection in a Second-Order fluid under the effects of Suction-Injection-Combination and Maxwell-Cattaneo Law is studied. The classical Fourier law is replaced with the Non-Classical Maxwell-Cattaneo heat flux law in the energy equation. A linear stability analysis is performed to obtain the eigenvalues for free-free isothermal boundary conditions. The influence of the parameters like Cattaneo number, Prandtl number, and Visco-elastic parameter has been analysed and found that …
Published in Recent Trends in Fluid Mechanics · Vol. 5, Issue 1, 2018 · pp. 75–85 Read article
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Use of single time reference measurements of bus variable in the determination of voltage instability condition of a power system
Abstract: Normal 0 false false false EN-US X-NONE X-NONE The paper describes a measurement based voltage stability index for monitoring of voltage stability condition of a power system. For this purpose, it is required to measure the voltage and reactive power of a target/selected (bus under investigation) along with the voltages of the other buses connected to the target/selected bus for a single time instant. These measurements and transmission line parameters …
Published in Journal of Instrumentation Technology & Innovations · Vol. 4, Issue 1, 2014 · pp. 24–30 Read article
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Engineering Perspectives: Thermal and Structural Examination of Disc Brakes for Light Vehicles
Abstract: The procedure of braking transforms the kinetic energy of a car into mechanical energy that needs to be released as heat. High temperatures may result from the frictional heat produced at the disc and pad interface during the braking phase. Frictional heat produced on the rotor surface can contribute to an excessive rise in temperature, which can have unfavorable effects including premature wear, brake fluid vaporization (BFV), thermally excited vibrations …
Published in International Journal of Electrical Machine Analysis and Design · Vol. 1, Issue 2, 2023 · pp. 16–23 Read article
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A Review on Thermal and Structural Analysis of Disc Brakes in Motor Vehicles
Abstract: Braking is a technique that turns kinetic energy in a vehicle into mechanical energy that must be dissipated as heat. The frictional heat created at the disc-pad interface can cause high temperatures during the braking period. Thermal elastic instability (TEI), early wear, brake fluid vaporisation (BFV), and thermally stimulated vibrations can all be caused by frictional heat created on the rotor surface (TEV). In this research, a vehicle's solid type …
Published in Journal of Automobile Engineering and Applications · Vol. 9, Issue 2, 2022 · pp. 1–7 Read article
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Theoretical modelling of heat transfer in non-homogeneous porous media
Abstract: The paper is focused on the study and analysis of heat transfer in geothermal substrates made up of non-homogeneous porous media. The paper analyses the influence of porosity on the heat transfer as a result of the combination of conduction and convection mechanisms that take place in non-homogeneous porous materials. As a result of the combined effect heat transfer is not homogeneously distributed throughout the cross section of the geothermal …
Published in Journal of Geotechnical Engineering · Vol. 9, Issue 2, 2022 · pp. 44–51 Read article
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Enhancing Chatter Resistance in Deep Hole Boring Through Modified Tool Design: A Study on Impact of Length-To-Diameter (L/D) Ratio
Abstract: Deep hole boring is a specialized machining process crucial for creating precise bores with high length-to-diameter (L/D) ratios, particularly vital in aerospace, automotive, and oil and gas industries. The L/D ratio is pivotal for stability and performance. Chatter, a detrimental vibration phenomenon, is a significant concern in deep hole boring, influenced by the L/D ratio. Higher L/D ratios increase chatter, leading to poor surface finish and reduced tool life. Longer …
Published in International Journal of Machine Systems and Manufacturing Technology · Vol. 2, Issue 2, 2024 · pp. 24–33 Read article
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Double-Integral Type of Indirect Sliding Mode Controller for Power Buck Converters fed with Constant Power Loads
Abstract: This article signifies the robust nonlinear technique to solve instability issues of dc-dc buck power converter connected with constant power load. When power electronic converter operates under tightly regulated condition will have constant power behavior at its input terminals. This CPL will exhibit NII (negative incremental impedance) behavior, it is the main root cause of instability problems in the system. These instabilities can be eliminated by using the nonlinear controller …
Published in Trends in Electrical Engineering · Vol. 13, Issue 2, 2023 · pp. 69–78 Read article
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A New Computational Method for Dust and Gas Dynamics in Protoplanetary Discs
Abstract: The simultaneous evolution of dust and gas in protoplanetary discs regulates essential events in planet formation, such as dust accumulation, migration, and the initiation of gravitational instabilities. Nevertheless, precisely modelling this interaction continues to provide a significant computing problem owing to the extensive variety of spatial and temporal scales involved. In this study, we introduce an innovative computational framework for simulating dust-gas dynamics in protoplanetary discs, integrating a two-fluid hydrodynamical …
Published in International Journal of Universe · Vol. 1, Issue 2, 2025 · pp. 35–46 Read article
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Regulation of Boost Converter Using Double Integral Sliding Mode controller with CPL
Abstract: This paper represents a robust nonlinear control strategy to solve the instability problem of dc-dc boost power converter with constant power load by using double integral sliding mode control (DISMC) method. DISM is an indirect type of sliding mode control strategy and overcomes the problems due to CPL. DISM provides better tracking performance of voltage and eliminates voltage steady state error. This strategy ensures large signal stability as well as …
Published in Journal of Control & Instrumentation · Vol. 14, Issue 2, 2023 · pp. 1–12 Read article
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Study on Hot Working Characteristics and Deformation Response of as Cast AZ91 Mg Alloys
Abstract: The deformation response of magnesium alloy AZ91 was investigated by means of hot compression tests. The flow curves were obtained in the temperature and strain rate range of 300–500°C and 0.001–1 s-1, respectively. The processing maps of the studied material were obtained by interpreting them on the basis of the dynamic material model. The activation energy maps were developed based on Lyapounov’s function and the safe processing zones were confirmed …
Published in Journal of Materials & Metallurgical Engineering · Vol. 1, Issue 1-3, 2011 · pp. 112–122 Read article
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Exploring the Path to Strategic Investment: An In-Depth SWOT Analysis of Renewable Energy in Afghanistan
Abstract: This study employs SWOT analysis to assess Afghanistan's renewable energy (RE) sector, crucial for achieving its 2030 vision and Paris Agreement commitments. Strengths include RE potential, power sector reform, feed-in tariffs, and donor support. Weaknesses involve security, technical, commercial, and financing hurdles. Opportunities stem from rising energy demand,climate awareness, and decreasing RE costs, while threats include power import reliance, low cost recovery, and policy instability. To attract sustainable foreign direct …
Published in Journal of Nuclear Engineering & Technology · Vol. 13, Issue 3, 2023 · pp. 6–22 Read article
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Prosthodontic Rehabilitation of a Nonagenarian Patient
Abstract: Geriatric patient are real challenges in dentistry. They require physical, psychological social support services to attain a proper treatment. Treating Nonagenarian patient having an age of 95year is really questionable, in a prosthodontist view high quality complete denture has been a key skill for the proper management of severely resorbed ridge. Complete edentulism can be described as an irreversible condition that decreases health-related quality of life with consequences on chewing …
Published in Research and Reviews: A Journal of Dentistry · Vol. 14, Issue 1, 2023 · pp. 12–17 Read article
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Assess the Effectiveness of Progressive Muscle Relaxation Therapy on Health Status among Blood Cancer Patients Receiving Cancer Treating Medications in Selected Hospital
Abstract: Introduction: Cancer can be regarded as a group of diseases characterized by an i) abnormal growth of cells ii) ability to invade adjacent tissues and even distant organs, and iii) the eventual death of the affected patient if the tumour has progressed beyond that stage when it can be successfully removed. Cancer can occur at any site or tissue of the body and may involve any type of cells. Cancer …
Published in Research and Reviews: Journal of Oncology and Hematology · Vol. 10, Issue 2, 2021 · pp. 1–20 Read article