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Partial sine wave tracking dual mode control topology for a single-phase transformerless photovoltaic system

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Journal of Modern Power Systems and Clean Energy 2018年第6期6卷 1338-1343页

作者： Koki OGURA mohan lal KOLHE Mutsuo NAKAOKA Kyushu Sangyo University University of Agder University of Malaya

A unique high efficiency photovoltaic(PV)system is presented. It uses partial sine wave tracking for a pulse-width modulation(PWM) boost converter as well as a full-bridge inverter. The boost converter and full-bridge inverter are connected via a compact intermediate film capacitor(i.e. non-smoothing DC link stage). PWM switching is activated by a dual mode control technique. In the proposed topology, simultaneous switching of both power conversion stages is avoided and therefore this increases the power conversion efficiency. The distinctive operating principles of these two power processing stages are discussed and analyzed with the experimental results for single-phase loading of the PV system.

关键词： Partial sine wave instantaneous tracking pulsewidth modulation(PWM) boost converter Bypass diode Dual mode control High efficiency power conversion

Economic Power Dispatching from Distributed Generations: Review of Optimization Techniques

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Energy Engineering 2024年第3期121卷 557-579页

作者： Paramjeet Kaur Krishna Teerth Chaturvedi mohan lal Kolhe Department of Electrical&Electronics Engineering University Institute of TechnologyBhopalIndia Faculty of Engineering and Science University of AgderKristiansandNorway

In the increasingly decentralized energy environment,economical power dispatching from distributed generations(DGs)is crucial to minimizing operating costs,optimizing resource utilization,and guaranteeing a consistent and sustainable supply of electricity.A comprehensive review of optimization techniques for economic power dispatching from distributed generations is imperative to identify the most effective strategies for minimizing operational costs while maintaining grid stability and *** choice of optimization technique for economic power dispatching from DGs depends on a number of factors,such as the size and complexity of the power system,the availability of computational resources,and the specific requirements of the *** techniques for economic power dispatching from distributed generations(DGs)can be classified into two main categories:(i)Classical optimization techniques,(ii)Heuristic optimization *** classical optimization techniques,the linear programming(LP)model is one of the most popular optimization *** the LP model,power demand and network constraints are met while minimizing the overall cost of generating electricity from *** approach is efficient in determining the best DGs dispatch and is capable of handling challenging optimization issues in the large-scale system including *** quadratic programming(QP)model,a classical optimization technique,is a further popular optimization method,to consider *** QP model can take into account the quadratic cost of energy production,with consideration constraints like network capacity,voltage,and *** metaheuristic optimization techniques are also used for economic power dispatching from DGs,which include genetic algorithms(GA),particle swarm optimization(PSO),and ant colony optimization(ACO).Also,Some researchers are developing hybrid optimization techniques that combine elements of classical and heuristic optimiz

关键词： Economic power dispatching distributed generations decentralized energy cost minimization optimization techniques

Influence of cryogenic treatment on the wear characteristics of 100Cr6 bearing steel

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International Journal of Minerals,Metallurgy and Materials 2014年第1期21卷 46-51页

作者： R.Sri Siva D.mohan lal P.Kesavan Nair M.Arockia Jaswin Department of Mechanical Engineering College of Engineering GuindyAnna University Department of Metallurgical and Material Engineering Indian Institute of Technology Madras Department of Mechanical Engineering Aksheyaa College of Engineering

A series of reciprocating wear tests were performed on the deep cryogenically treated and conventionally heat-treated samples of 100Cr6 bearing steel to study the wear resistance. The worn surfaces as well as the wear debris were analyzed by scanning electron microscopy. The improvement in wear resistance of the deep cryogenically treated samples ranges from 49% to 52%. This significant improvement in wear resistance can be attributed to finer carbide precipitation in the tempered martensitie matrix and the transformation of retained aus- tenite into martensite. X-ray diffraction analysis shows that the volume fraction of retained austenite in the conventionally heat-treated samples is 14% and that of the deep cryogenically treated samples is only 3%.

关键词： bearing steel cryogenic treatment wear resistance carbides martensite

Effects of deep cryogenic treatment on mechanical and tribological properties of AISI D3 tool steel

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Friction 2015年第3期3卷 234-242页

作者： Nay Win KHUN Erjia LIU Adrian Wei Yee TAN D.SENTHILKUMAR Bensely ALBERT D.mohan lal School of Mechanical and Aerospace Engineering Nanyang Technological University 50 Nanyang AvenueSingapore 639798Singapore Department of Mechanical Engineering P.A.College of Engineering and TechnologyPollachi 642002TNIndia QuEST Global Services-NA Inc.GreenvilleSC 29615USA Department of Mechanical Engineering College of EngineeringGuindyAnna University Chennai 600025India

In this study,the effects of deep cryogenic treatment(DCT)on the mechanical and tribological properties of AISI D3 tool steel were investigated together with a systematic correlation between their hardness and wear *** was found that conventionally heat treated AISI D3 tool steel samples were significantly hardened via an additional DCT,which was attributed to the more retained austenite elimination,more homogenized carbide distribution and more reduction in carbide size in the *** a result,the hardened AISI D3 samples exhibited reductions in their friction and wear during rubbing against alumina and 100Cr6 steel balls under different normal loads due to the effectively hindered removal of surface *** results clearly showed that the DCT was an effective way to improve the mechanical and tribological properties of the AISI D3 tool steel samples as the tribological performance of the tool steel samples was significantly influenced by their hardness.

关键词： AISI D3 tool steel deep cryogenic treatment hardness friction wear

Gly→Ala Point Mutation and Conformation of Poly-Ala Stretch of PABPN1: A Molecular Dynamics Study

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Journal of Biophysical Chemistry 2015年第2期6卷 54-63页

作者： Mohd Shafique mohan lal Garg Fateh Singh Nandel Department of Biophysics Panjab University Chandigarh India

Single nucleotide replacing mutations in genes cause a number of diseases, but sometimes these mutations mimic other genetic mutations such as trinucleotide repeats expansions. A mutation in codon GGG→GCG results in Gly→Ala at the N-terminal of PABPN1 protein that mimics the trinucleotide repeat expansion disease called Oculopharyngeal muscular dystrophy (OPMD). Molecular dynamics simulations in water with peptide models having sequence Ac-A10-GA2GG-NHme (peptide A) and Ac-A10A3GG-NHme (peptide B) reveal an increase in the length of helical segment in peptide B. The α-helical length is found to be stable in peptide B with starting geometry of a right handed helix, while in the case peptide A, the helical length is short. The interactions of water molecules at terminals, side chain-backbone interactions and hydrogen bonds provide stability to resultant conformation. The adopted helix by the poly-Ala stretch may lead to masking some other active parts of the PABPN1 that may trigger the aggregation, decrease in degradation and/or impaired function of protein. Hence, further studies with N-terminal may be helpful to understand unclear disease mechanism.

关键词： Single Nucleotide Polymorphism Gly→Ala Mutation Poly-Ala OPMD PABPN1

Energy Assessment of Building Integrated Photovoltaics and Fuel Cell Systems: Design Study for Building(s) of Mie, Japan

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Smart Grid and Renewable Energy 2017年第5期8卷 129-144页

作者： Akira Nishimura Satoshi Kitagawa Masafumi Hirota mohan lal Kolhe Division of Mechanical Engineering Graduate School of Engineering Mie University Tsu Japan Faculty of Engineering and Science University of Agder Kristiansand Norway

A building integrated energy system (photovoltaic (PV) and fuel cell (FC)) is proposed for assessment of the energy self-sufficiency rate in five cities of Mie prefecture in Japan. In this work, it is considered that the electricity requirement of the building is provided by the building integrated photovoltaic (BIPV) system and the gap between the energy demand and BIPV supply is fulfilled by the FC. The FC is powered by the electrolytic H2 produced from the surplus power of PV. A design study of using the proposed system in five cities in Mie prefecture, which are in center part of Japan, has been performed. It has been observed that the monthly power production from BIPV is higher in spring and summer, while it is lower in autumn and winter at all considered locations. The self-sufficiency rate of the FC system is higher with decreasing households’ number and it has been observed that the 12 households are more suitable for full cover of the electricity demand by the combined system of PV and FC. The relationship between the households’ number and self-sufficiency rate of the FC system per solar PV installation area can be expressed by exponential curve. The coefficient of the exponential curve can predict the suitable city for the BIPV system with FC system utilizing electrolytic H2 generated by using excess energy from the PV system.

关键词： Smart Building Photovoltaics H2 Produced by Water Electrolysis Fuel Cell Self-Sufficiency Rate

Impact of Separator Thickness on Temperature Distribution in Single Polymer Electrolyte Fuel Cell Based on 1D Heat Transfer

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Energy and Power Engineering 2022年第7期14卷 248-273页

作者： Akira Nishimura Daiki Mishima Nozomu Kono Kyohei Toyoda mohan lal Kolhe Mie University Tsu Japan

It is known from the New Energy and Industry Technology Development Organization (NEDO) roam map Japan, 2017 that the polymer electrolyte fuel cell (PEFC) power generation system is required to operate at 100°C for application of mobility usage from 2020 to 2025. This study aims to clarify the effect of separator thickness on the distribution of the temperature of reaction surface (Treact) at the initial temperature of cell (Tini) with flow rate, relative humidity (RH) of supply gases as well as RH of air surrounding cell of PEFC. The distribution of Treact is estimated by means of the heat transfer model considering the H2O vapor transfer proposed by the authors. The relationship between the standard deviation of Treact-Tini and total voltage obtained in the experiment is also investigated. We can know the effect of the flow rate of supply gas as well as RH of air surrounding cell of PEFC on the distribution of Treact-Tini is not significant. It is observed the wider distribution of Treact-Tini provides the reduction in power generation performance irrespective of separator thickness. In the case of separator thickness of 1.0 mm, the standard deviation of Treact-Tini has smaller distribution range and the total voltage shows a larger variation compared to the other cases.

关键词： Polymer Electrolyte Fuel Cell Heat Transfer Modeling H2O Vapor Transfer Temperature Distribution High Temperature

Impact Analysis of MPL on a PEFC Cell’s Temperature Distribution with Thin PEM and GDL for Operating at Higher Temperature than Usual

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Journal of Energy and Power Engineering 2021年第2期15卷 39-51页

作者： Akira Nishimura Nozomu Kono Kyohei Toyoda Yuya Kojima mohan lal Kolhe Division of Mechanical Engineering Graduate School of EngineeringMie UniversityTsu-CityMie 514-8507Japan Faculty of Engineering and Science University of AgderKristiansand No.4604P.O.Box 422Norway

According to the New Energy and Industry Technology Development Organization(NEDO)road map 2017 of Japan,polymer electrolyte fuel cell(PEFC)system is required to be operated at 90°C and 100°C for stationary and mobility applications,***,the general PEFC,which has Nafion membrane is operated within the temperature range between 60°C and 80°*** is important to understand the temperature distribution in a PEFC cell for analyzing performance on working life span of *** study focuses on the combination of thin polymer electrolyte membrane(PEM)and thin gas diffusion layer(GDL)to improve power generation performance under relatively higher temperature operation *** addition,this study also focuses on effect of micro porous layer(MPL),which can promote the mass transfer,over temperature *** key aim of this study is to analyze impact of MPL of temperature distribution on the reaction surface(Treact)of a cell of PEFC using thin PEM and GDL with variations of H2 and O2 supply flow rates and their relative humidity(RH)with changing the initial operating temperature(Tini)from 80°C to 100°*** a result,the distribution of Treact without MPL,for anode and cathode at 80%RH and Tini at 80°C and 90°C,is higher than normal *** is a small difference in temperature distribution among different RH conditions with *** distributions of Treact are relatively flat and almost the same among different RH conditions without MPL at Tini=100°C,while the distributions of Treact with MPL are almost the same among different RH *** study is revealed that more even temperature distribution and higher power generation performance can be obtained in the case without MPL compared to the case with MPL.

关键词： PEFC temperature distribution analysis MPL thin PEM and thin GDL higher temperature operation

Identification and Characterization of Heparan Sulphate Binding Proteins of <i>Entamoeba histolytica</i>

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Journal of Biosciences and Medicines 2018年第8期6卷 60-71页

作者： Upninder Kaur Sumeeta Khurana Uma Nahar Saikia mohan lal Dubey Rakesh Sehgal Department of Medical Parasitology Postgraduate Institute of Medical Education and Research Chandigarh India Department of Histopathology Postgraduate Institute of Medical Education and Research Chandigarh India

A large number of microbial pathogens bind to heparan sulphate on eukaryotic cell surfaces. Heparan Sulphate Binding Proteins (HSBPs) from Entamoeba histolytica culture lysates were obtained by sequential ammonium sulphate precipitation and Protein purify. SDS-PAGE and immunoblotting experiments indicated the presence of two major extracellular proteins in E. histolytica (51.2 kDa and 61.0 kDa). Characterization of HSBPs by 2D Gel electrophoresis of 40% (NH4)2SO4 precipitated lysate of E. histolytica revealed that the isoelectric point of 51.2 kDa HSBP was at pH3.0. The protein of 61.0 kDa HSBP showed three spots in 40% (NH4)2SO4 lysate which had isoelectric point between pH 4.0 - 7.0. While in 80% (NH4)2SO4 precipitated lysate, 51.2 kDa HSBP showed only one spot which had isoelectric point at pH 3. However, 61.0 kDa HSBP revealed 2 spots which had isoelectric point between pH 4 and 5. The result showed that this parasite has proteins which interact with heparan sulphate whose molecular formula is C14H23NO21S-23. These proteins may have a role in binding of parasite to heparan sulphate on host cells. Further characterization by MALDI-TOF analysis of HSBPs from E. histolytica demonstrated HSBPs to be novel protein in this parasite which has been isolated, purified and characterized first time by our group in the present study.

关键词： Heparan Sulphate Entamoeba histolytica Identification Characterization