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Search Results: 1 - 10 of 423101 matches for " K. S. Sandhu "
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Simulation study of three-phase induction motor with variations in moment of inertia
K. S. Sandhu,Vivek Pahwa
Journal of Engineering and Applied Sciences , 2009,
Abstract: Transient performance of any electrical machine is greatly affected by sudden changes in its supply system, operating speed, shaft load including any variations in moment of inertia due to gear arrangement applications. D, q- axis modeling which is universally acceptable to determine such analysis may be adopted using stator reference frame/rotor reference frame/synchronously rotating reference frame. In this paper, rotor reference frame is used for the simulation study of three phase induction motor. MATLAB/SIMULINK based modeling is adopted to compare the transient performance of three-phase induction motor including main flux saturation with and without the moment of inertia (MOI) of the system attached to the motor. Simulated results have been compared and verified with experimental results on a test machine set-up. A close agreement between the simulated and experimental results proves the validity of proposed modeling.
Effects on major power quality issues due to incoming induction generators in power system
K. S. Sandhu,Sudhir Sharma
Journal of Engineering and Applied Sciences , 2010,
Abstract: This paper presents a laboratory study on the effects of integration of induction generators on grid power quality parameters such as voltage, frequency power factor, harmonics and reactive power. Study is carried out with different switching sequence of grid connected induction generators. The analysis is done with two squirrel cage induction generators and one wound rotor induction generator coupled to DC shunt motors. Experimental results as obtained with different switching sequence are found to be very interesting and useful for final recommendations.
Transient analysis of three-phase induction machine using different reference frames
Vivek Pahwa,K.S. Sandhu
Journal of Engineering and Applied Sciences , 2009,
Abstract: Three-phase induction machines are generally used as motors for many industrial applications and all this is due to its simple construction and other advantages in contrast to other machines. Popularity of these motors has resulted into a lot of research including the transient behavior of the machine. Literature survey reveals that most of the researchers adopted only a single reference frame to estimate transient behavior of the machine. In this paper qd axis based modeling is proposed to analyze the transient performance of three-phase squirrel cage induction motor using stationary reference frame, rotor reference frame and synchronously rotating reference frame. Simulated results have been compared and verified with experimental results on a test machine. A close agreement between the simulated and experimental results proves the validity of proposed modeling. The proposed system has been developed using MATLAB/SIMULINK.
Low voltage ride-through (LVRT) of grid interfaced wind driven PMSG
Rajveer Mittal,K. S. Sandhu,D. K. Jain
Journal of Engineering and Applied Sciences , 2009,
Abstract: In renewable power generation, wind energy has been noted as the most rapidly growing technology; it attracts interest as one of the most cost-effective ways to generate electricity from renewable sources. Wind generation system has potential application for the grid support. The voltage of the direct driven permanent magnet wind generators (PMSG) is variable due to the intermittent nature of the wind energy. Fluctuating voltage and power is of major concern in the converter based grid connected wind generation systems. An inverter is essential for the interfacing of the wind source with the AC network. There are many possible inverter topologies and inverter switching schemes and each one will have its own relative advantages and disadvantages. Variable speed permanent magnet synchronous generators are used for maximum power extraction from the wind energy conversion system. This paper discusses the interconnection issues of these generators to local grid as per prevailing grid standards during healthy and fault conditions. The fault ride-through topology for PMSG has been demonstrated using MATLAB Simulink based simulation.
Wrong Potential Energy Term in Schr?dinger’s Equation for Hydrogen Atom  [PDF]
Gurcharn S. Sandhu
Journal of Modern Physics (JMP) , 2018, DOI: 10.4236/jmp.2018.94042
Abstract: Even after nine decades of successful run of the Quantum Mechanics (QM), different viewpoints on foundational problems of Quantum Physics are still being actively debated. That is because mathematical logic of QM often defies the physical intuition which constitutes the main spirit of Physics. De Broglie’s hypothesis of matter waves implied that the dynamic characteristics of a micro particle in motion, can be ascribed to the wave characteristics of the wavelet accompanying the particle. The Schrödinger equation models the matter-wave interactions through wavefunction ψ?and effectively serves as the foundation of QM. Even though mathematical structure of the Schrödinger equation is sound and elegant, here we show a conceptual mistake in the development of this equation wherein the physical situation has not been correctly modeled in the equation. The Coulomb potential energy of the proton electron pair in Hydrogen atom is essentially the negative interaction energy between their superposed electrostatic fields which is inversely proportional to their instantaneous separation distance. Assuming the proton to be relatively fixed at the origin of an appropriate coordinate system, the potential energy of the orbiting electron will be a function of instantaneous position coordinates of the electron. This has not been properly modeled in the Schrödinger equation. The resulting errors in the solution have been quantitatively demonstrated in this paper. We have stressed the necessity of incorporating a specific correction in the potential energy term of the Schrödinger equation, after which it may facilitate the adoption of Bohmian QM.
Pharmacological and therapeutic potential of Cordyceps with special reference to Cordycepin
Hardeep S. Tuli,Sardul S. Sandhu,A. K. Sharma
3 Biotech , 2013, DOI: 10.1007/s13205-013-0121-9
Abstract: An entomopathogenic fungus, Cordyceps sp. has been known to have numerous pharmacological and therapeutic implications, especially, in terms of human health making it a suitable candidate for ethno-pharmacological use. Main constituent of the extract derived from this fungus comprises a novel bio-metabolite called as Cordycepin (3′deoxyadenosine) which has a very potent anti-cancer, anti-oxidant and anti-inflammatory activities. The current review discusses about the broad spectrum potential of Cordycepin including biological and pharmacological actions in immunological, hepatic, renal, cardiovascular systems as well as an anti-cancer agent. The article also reviews the current efforts to delineate the mechanism of action of Cordycepin in various bio-molecular processes. The study will certainly draw the attention of scientific community to improve the bioactivity and production of Cordycepin for its commercial use in pharmacological and medical fields.
Performance and combustion characteristics of a typical motor bike engine operated on blends of CNG and hydrogen using electronically controlled solenoid actuated injection system
S. S. Sandhu,M. K. G. Babu,L. M. Das
Journal of Engineering and Applied Sciences , 2011,
Abstract: This paper discusses the development of an electronically controlled gas injection system for hydrogen supplemented single cylinder Enfield engine. In view of its typical combustion characteristics, the fuel induction technique plays a very dominant and sensitive role in the performance as well as the combustion characteristics of hydrogen supplemented CNG engine. The designed system should have adequate flexibility to provide the appropriate mixture into the engine at the appropriate point in the engine cycle operation. The motor bike engine was fuelled with neat CNG and mixtures of hydrogen in natural gas (HCNG) of 5, 10, 15 and 20% by energy. The designed Electronic Fuel Injection System ensured successful operation of engine running on different fuel blends over a wide range of load and speed without causing any undesirable combustion phenomena such as backfire or pre-ignition. The performance and combustion characteristics were determined under various operating conditions.
Effect of epidemiological parameters on the development of Ascochyta blight of pea
PUSHPINDER P. SINGH, AMIT WADHWA and K.S. SANDHU
Indian Phytopathology , 2012,
Abstract:
Influence of post-inoculation diurnal conditions on development of Ascochyta blight of peas
PUSHPINDER P. SINGH*, AMIT WADHWA and K.S. SANDHU
Indian Phytopathology , 2012,
Abstract:
SOME IMPORTANT FUNGI, TRICHOPHYTON SP., BEAVERIA BASSIANA AND PLUROTUS OSTREATUS RESIST HEAVY METALS: PROMISING FUNGAL STRAINS FOR THEIR POTENTIAL AS BIOREMEDIATION AGENTS
Raman Kumar, A. K. Sharma Ratnesh Pandey, and Sardul S. Sandhu
Current Trends in Biotechnology and Chemical Research , 2012,
Abstract: Many industries like electroplating, paint, lather tanning etc. release enormous amount of heavy metals contaminated wastewater. These heavy metals enter into human beings and animals through food chain. So there is a need to remove these heavy metals through low cost technology. Microorganisms including fungi and bacteria have been reported to exclude heavy metals from wastewater through bioaccumulation and biosorption at low cost and in an eco-friendly manner. An attempt was, therefore, made to screen various fungi such as Trichophyton sp., Beaveria bassiana and Pleurotus ostreatus on Potato Dextrose Agar (pH 5.0) supplemented with 20, 40, 60, 100 and 500 mg/l concentrations of Cd, Fe, Ni and Hg individually. Observations on growth of fungi were made after 5 days of incubation at 28±20C. The results showed that all the fungi showed a dose dependent decrease in growth pattern with the increase in metal concentration. Trichophyton sp. and Pleurotus ostreatus were found to resist Cd, Ni and Fe more effectively than B. bassiana. However none of the strains could grow above 100 ppm concentrations of all the heavy metals. Hgcontaining plates though, didn't show any growth even beyond 40 ppm which indicates the toxicity level of mercury in the all fungal strains and their inability to tolerate this metal above the said concentration. These fungal strains could be potentially very useful in bioremediation in terms of removal of toxic heavy metals.
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