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Estimation of composite load model with aggregate induction motor dynamic load for an isolated hybrid power system

Frontiers in Energy 2015年第4期9卷 472-485页

作者： Nitin kumar SAXENA ashwani kumar sharma Deptment of Electrical Engineering NIT Kumkshetra Haryana 136119 India

It is well recognized that the voltage stability of a power system is affected by the load model and hence, to effectively analyze the reactive power compensation of an isolated hybrid wind-diesel based power system, the loads need to be considered along with the generators in a transient analysis. This paper gives a detailed mathematical modeling to compute the reactive power response with small voltage perturbation for composite load. The composite load is a combination of the static and dynamic load model. To develop this composite load model, the exponential load is used as a static load model and induction motors （IMs） are used as a dynamic load model. To analyze the dynamics of IM load, the fifth, third and first order model of IM are formulated and compared using differential equations solver in Matlab coding. Since the decentralized areas have many small consumers which may consist large numbers of IMs of small rating, it is not realistic to model either a single large rating unit or all small rating IMs together that are placed in the system. In place of using a single large rating IM, a group of motors are considered and then the aggregate model of IM is developed using the law of energy conservation. This aggregate model is used as a dynamic load model. For different simulation studies, especially in the area of voltage stability with reactive power compensation of an isolated hybrid power system, the transfer function AQ/AV of the composite load is required. The transfer function of the composite load is derived in this paper by successive derivation for the exponential model of static load and for the fifth and third order IM dynamic load model using state space model.

关键词： isolated hybrid power system (IHPS) compo- site load model static load dynamic load induction motorload model aggregate load

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Indirect Solar Drier with Electric Back up System for Quality Hill Products

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Natural Resources 2010年第2期1卷 88-94页

作者： Rajeev kumar Aggarwal Madan Mohan sharma ashwani kumar sharma 不详

An indirect solar drier of 25 kg capacity has been developed fitted with solar cell for running the fan. The bulbs are provided in the solar collector for air heating during clouds and evening & morning for faster drying reducing drying time. Various hill crops (Punica granatum L, Ginger, Turmeric and Red chili) have been dried in open sun, oven and solar drier for quality/caparison. The dried products were tested in the post harvest technology laboratory for value addition. The market value of dried products has also been compared.

关键词： Solar Drier Drying Hill Crops Quality Income Generation

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In vivo antianxiety and antidepressant activity of Murraya paniculata leaf extracts

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Journal of Integrative Medicine 2017年第4期15卷 320-325页

作者： Pragya sharma Sonali Batra ashwani kumar Anupam sharma University Institute of Pharmaceutical Sciences Panjab University

OBJECTIVE： Different parts of Murraya paniculata have been used traditionally for treating several ailments including mental disorders. The present study was designed to evaluate the antianxiety and antidepressant potential of M. paniculata leaves using elevated plus maze model and forced swim test, respectively. METHODS： Extracts of M. panicu/ata made with petroleum ether （60-80 ℃）, chloroform, ethanol and water were evaluated for antianxiety and antidepressant activity. The anxiolytic chloroform extract was subjected to column chromatography, yielding five fractions （F1-F5）. Fraction F5 （100 mg/kg）, which showed notable anxiolytic activity, was further chromatographed to get four subfractions （F5.1-F5.4）. Simultaneously, the ethano extract was partitioned with ethyl acetate to obtain ethyl acetate soluble fraction （EASF） and ethyl acetate insoluble fraction. Phytochemical screening of bioactive extracts/fractions and detection of mahanimbine in M paniculata leaf extract by thin-layer chromatography was also carried out. RESULTS： Fraction F5.3 （25 mg/kg） and EASF （20 mg/kg） showed significant anxiolytic and antidepressant activity, respectively. Thin-layer chromatography and phytochemical screening demonstrated the absence of mahanimbine in M. paniculata leaves. Coumarins were observed to be responsible for the anxiolytic activity. CONCLUSION： The results validate the traditional use of M. paniculata leaves in the treatment of menta disorders.

关键词： Murraya paniculata anxiety depressant coumarins mahanimbine plants, medicinal

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Comparative efficacy of hyperbaric bupivacaine vs hyperbaric ropivacaine in spinal anesthesia for cesarean section:A metaanalysis

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World Journal of Methodology 2025年第2期15卷 154-165页

作者： Rishi Anand Deb Sanjay Nag Roushan Patel Prashant sharma Vamsi Krishna Uppalapati Umesh kumar Singh Department of Anaesthesiology Tata Main HospitalJamshedpur 831001JhārkhandIndia

BACKGROUND Intrathecal bupivacaine is the traditional anesthetic drug used in spinal anesthesia for caesarean sections(CSs),but ropivacaine has emerged as a potential *** meta-analysis compares the efficacy and safety of intrathecal hyper-baric bupivacaine vs hyperbaric ropivacaine for cesarean *** To systematically evaluate and compare the efficacy and safety of intrathecal hyperbaric bupivacaine and hyperbaric ropivacaine for spinal anesthesia in *** A thorough search of electronic databases was carried out to find pertinent randomized controlled trials(RCTs)comparing intrathecal hyperbaric ropi-vacaine and hyperbaric bupivacaine during ***,Cochrane database,Google Scholar,and Scopus were searched,and papers from January 2000 to January 2024 were deemed eligible and filtered using predetermined inclusion and exclusion *** were assessed for methodological quality,and data were extracted for time to adequate anesthesia(sensory and motor blockade),duration of sensory and motor block,hemodynamic changes and side effect *** standardized mean difference with 95%CI was used for continuous *** variables were assessed using the Mantel-Haenszel test and the random effect model to compute the odds *** Total 8 RCTs were selected from a pool of 119 search results for *** meta-analysis evaluated pooled effect sizes and assessed heterogeneity among the *** primary objective was to compare key outcomes to identify any significant variances in efficacy and safety profiles between two local *** analysis revealed that the difference in the onset of sensory blockade between the two local anesthetics was statistically insignificant(P=0.1586).However,the onset of motor blockade appeared to be faster with bupivacaine(P=0.03589).Additionally,the regression of sensory and motor blockade occurred earlier in the ropivacaine ***,the duration of the first analgesic

关键词： Ropivacaine Bupivacaine Anesthesia Spinal Cesarean section Meta-analysis

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Metal nanocomposites-based electrochemical sensor for the detection of Vanillin (food additives): Experimental and theoretical approach

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Food Bioscience 2023年第2期52卷 1451-1465页

作者： Rajni kumari Harish kumar Ankita Yadav Rahul sharma Anita kumari ashwani kumar Dept.of Chemistry Central University of HaryanaMahendergarhIndia Dept.of Nutrition Biology School of Interdisciplinary SciencesCUHMahendergarhIndia

A sensitive and selective electrochemical sensor was developed to detect Vanillin using Mn/Zn/V(MZV)*** nanocomposites were synthesized by modified Sol-gel technique and characterized by FT-IR,UV-VIS,SEM,and XRD *** Voltammetry,Linear Sweep Voltammetry,and Differential Pulse Voltammetry experiments were performed on a three-electrode-based electrochemical system.A computational study(DFT)was used to support experimental data and understand chemistry at the working electrode/electrolyte *** specially designed working electrode showed a good sensing ability toward Vanillin in real and reference *** working electrode displays a linear response between the current density and concentration of Vanillin(20-120μM)with a lowest detection limit of 120μ*** characteristic oxidative(0.051 V)and reductive peak(0.47 V),formal potential(0.270 V),open circuit potential(-570 mV),current density,and Emid potential(0.025 V)of Vanillin help in qualitative *** and stability of working electrodes were tested for 60 days.

关键词： Metal oxide nanocomposite Electrochemical sensor Vanillin Cyclic voltammetry

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A review of ecological risk assessment and associated health risks with heavy metals in sediment from India

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International Journal of Sediment Research 2020年第5期35卷 516-526页

作者： Vinod kumar Anket sharma Shevita Pandita Renu Bhardwaj ashwani kumar Thukral Artemi Cerda Department of Botany Government Degree College Ramban State Key Laboratory of Subtropical Silviculture Zhejiang Agriculture & Forest University Department of Botany University of Jammu Department of Botanical and Environmental Sciences Guru Nanak Dev University Soil Erosion and Degradation Research Group Department of GeographyUniversity of Valencia

Heavy metal(HM) pollution in sediment is a serious concern particularly in developing nations,warranting an extensive survey to understand the current situation and propose possible remedial *** paper compiles the data of HMs cadmium(Cd),iron(Fe),cobalt(Co),manganese(Mn),arsenic(As),lead(Pb),chromium(Cr),copper(Cu),zinc(Zn) and nickel(Ni) in aquatic sediment from India from 1979 to *** was found that mean values of Cu,Co,Zn,Pb,As,and Cr in Indian sediment were high in comparison to the Australian Interim Sediment Quality Guidelines,World Surface Rock Average,and the Threshold Effect Level for freshwater *** activities,lithogenic factors,and sand intrusion are the main factors associated with HM pollution as observed using cluster analysis and principal component *** results of contamination indices indicate that HM contamination ranged from average to high,in the *** ecological risk assessment results showed that 11%HMs present very high *** cancer risk,due to the high contents of Cd,As,and Cr the ingestion pathway,showed high risk of cancer through food/water contaminated with *** source reduction of HMs in industrial effluents by effluent treatment plants,and plantation of phytoremediating rooted macrophytes in sediment may help in HM mitigation of the sediment.

关键词： Sediments Heavy metal pollution Ecological risk assessment Cancer risk Health risk

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A novel method to investigate voltage stability of IEEE-14 bus wind integrated system using PSAT

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Frontiers in Energy 2020年第2期14卷 410-418页

作者： Satish kumar ashwani kumar N.K.sharma Department of Electrical Engineering National Institute of Technology(NIT)KurukshetraHaryana 136119India Department of Electrical Engineering G L Bajaj Institute of Technology and ManagementGreater NoidaUtter Pradesh 201306India

The maximum demand of power utilization is increasing exponentially from base load to peak load in day to day *** power demand may be either industrial usage or household *** meet this high maximum power demand by the consumer,one of the options is the integration of renewable energy resources with conventional power generation *** the present scenario,wind energy system is one of the methods to generate power in connection with the conventional power *** the load on the conventional grid system increases,various bus voltages of the system tend to decrease,causing serious voltage drop or voltage instability within the *** view of this,identification of weak buses within the system has become *** paper presents the line indices method to identify these weak buses,so that some corrective action may be taken to compensate for this drop in *** attempt has been made to compensate these drops in voltages by integration of renewable energy *** wind energy system at one of the bus in the test system is integrated and the performance of the system is verified by calculating the power flow(PF)using the power system analysis tool box(PSAT)and line indices of the integrated test *** PF and load flow results are used to calculate line indices for the IEEE-14 bus test system which is simulated on PSAT.

关键词： voltage stability line indices power system analysis tool box(PSAT) wind system line loading power flow(PF)

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Antioxidant and modulatory role of Chlorophytum borivilianum against arsenic induced testicular impairment

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Journal of Environmental Sciences 2012年第12期24卷 2159-2165页

作者： Garima sharma Madhu kumar Cell and Molecular Biology Laboratory Department of ZoologyCentre for Advanced studiesUniversity of RajasthanJaipur 302055India

Arsenic has a suppressive influence on spermatogenesis and induces impairment in male reproductive system due to oxidative stress. The present study was aimed to test the arsenic induced toxicity and protection by Chlorophytum borivilianum. The effect of sodium arsenite （4 mg/（kg body weight （bw）.day）） via double distilled water without or with C. borivilianum （800 mg/（kg ***）） was evaluated in Swiss albino mice for 30 days. The radical scavenging activity of the aqueous C. borivilianum root extract was measured using DPPH （1,1-diphenyl-2-picryl hydrayzyl） radical. Qualitative assessment of various cell types in the testis, sperm count and motility, testicular activity of lipid peroxidation （LPO）, reduced glutathione （GSH）, acid and alkaline phosphatase, cholesterol and serum testosterone were monitored. Arsenic treatment showed a significant increase in LPO, acid and alkaline phosphatase, cholesterol and decrease in sperm count, sperm motility, GSH and serum testosterone. Combined treatment showed significant decrease in LPO, acid and alkaline phosphatase, cholesterol and elevation in sperm count, sperm motility, GSH and serum testosterone. Testicular histopathology showed that C. borivilianum had reduced degeneration of germ cell in the seminiferous tubules and loss of sperms induced by arsenic intoxication. The results thus led us to conclude that administration of C. borivilianum root extract is found to be protective against arsenic induced toxicity.

关键词： DPPH radical assay Chlorophytum borivilianum reduced glutathione lipid peroxidation arsenic testosterone

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Effect of cooling media on bead geometry,microstructure,and mechanical properties of wire arc additive manufactured IN718 alloy

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Advances in Manufacturing 2024年第1期12卷 124-149页

作者： Parveen kumar Satish kumar sharma Ratnesh kumar Raj Singh Department of Mechanical Engineering Thapar Institute of Engineering and TechnologyPatialaPunjab147004India

This work aims to present and explore thermal management techniques for the wire arc additive manufacturing(WAAM)of IN718 *** heat can be mitigated via air or water *** this study,the material was deposited under four different heat-input conditions with air or water *** air cooling,the layer is deposited in a normal atmospheric air environment,whereas with water cooling,the material is deposited inside a water tank by varying the water *** validate the air and water cooling thermal management techniques,IN718 single-pass and multilayer linear walls were deposited using the bidirectional gas metal arc welding based WAAM setup under four different heat input *** the deposition of single layers,the temperature profiles were recorded,and the geometric and microstructural features were *** multilayer wall structures,the mechanical properties(hardness,tensile strength,and elongation)were determined and assessed using the corresponding microstructural features explored through scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),and electron backscatter diffraction(EBSD)*** microstructure observed through SEM analysis in the building direction was found to be nonhomogenous compared with that in the deposition ***,water cooling was found to govern bead characteristics,such as wall width and *** grain size and anisotropy of the mechanical properties also decreased in the water-cooled ***,water cooling is an economical and efficient method to mitigate excessive heat accumulation in WAAM-deposited IN718.

关键词： Air cooling Water cooling IN718 Bead characteristics Microstructure Electron backscatter diffraction(EBSD)

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PAPR Reduction in NOMA by Using Hybrid Algorithms

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Computers, Materials & Continua 2021年第10期69卷 1391-1406页

作者： Mohit kumar sharma Arun kumar Department of Electronics and Communication Engineering JECRC UniversityJaipur303905India

Non-orthogonal multiple access(NOMA)is gaining considerable attention due to its features,such as low out-of-band radiation,signal detection capability,high spectrum gain,fast data rate,and massive D2D *** may be considered for 5G ***,the high peak-to-average power ratio(PAPR)is viewed as a significant disadvantage of a NOMA waveform,and it weakens the quality of signals and the throughput of the *** this article,we introduce a modified NOMA system by employing a block of wavelet transform,an alternative to FFT(Fast Fourier transform).The modified system combines the details of fractional frequency and time analysis of NOMA *** this correspondence,we utilize an advanced partial transmission scheme(PTS),and selective mapping(SLM),and present a genetic algorithm(GA)for SLM to investigate the peak power performance of a WT-based NOMA *** performance of WT-SLM,WT-PTS,and WT-SLM-GA methods is compared with that of the traditional NOMAbased SLM and PTS *** simulation results demonstrate that the proposed system effectively reduces PAPR in comparison with the traditional schemes.

关键词： PAPR wavelet transform NOMA PTS SLM 5G

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