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Structural,thermomagnetic,and dielectric properties of Mn0.5Zn0.5GdxFe2-xO4(x=0,0.025,0.050,0.075,and 0.1)

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Journal of Advanced Ceramics 2020年第2期9卷 243-254页

作者： Lakshita PHOR vinod KUMAR Hydrogen Lab Department of PhysicsDCR University of Science and TechnologyMurthal-131039HaryanaIndia

In this paper,effect of Gd^3+was investigated on structural,magnetic,and dielectric properties of Mn0.5Zn0.5GdxFe2–xO4(x=0,0.025,0.050,0.075,and 0.1)nanoparticles prepared by facile coprecipitation method.X-ray diffraction(XRD)studies confirmed the single cubic spinel phase for all the samples and showed that lattice parameter(aexp)was found to increase from 8.414 to 8.446Åwith the substitution of Gd3+ions due to their larger ionic radii than the replaced Fe3+*** and size of developed nanoparticles were studied using transmission electron microscopy(TEM)and found that particle size decreased from 31.06 to 21.12 nm for x=0–*** properties showed that maximum magnetization decreased from 39.21 to 23.59 emu/g,and Curie temperature decreased from 192 to 176℃with increase in x from 0 to 0.1 due to weakening of superexchange *** parameters like dielectric constant(e¢ande¢),dielectric loss(tanδ),AC conductivity(σac),and impedance(Z¢and Z¢)as a function of frequency and composition were analyzed and *** was found thate¢,e¢,σac,and tanδvalues decreased with Gd substitution,which has been explained based on Maxwell–Wagner theory and hopping mechanism of electrons between Fe3+and Fe2+ions at octahedral *** plots for all the developed compositions showed single semi-circular arc which indicate the dominant effect of grain boundaries.

关键词： spinel ferrite coprecipitation method structural property magnetism dielectric property

Non-perturbative multiphoton excitation studies in an excitonic coupled quantum well system using high-intensity THz laser fields

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Chinese Physics B 2019年第8期28卷 355-363页

作者： Monica Gambhir vinod Prasad Department of Physics Swami Shraddhanand CollegeUniversity of DelhiDelhi 110036India Departmento de Quimica Universidad Autonoma MetropolitansSan Rafael Atlixco No186IztapalapaMexico DF 09340Mexico

Multiphoton excitations and nonlinear optical properties of exciton states in GaAs/AlxGa1-xAs coupled quantum well structure have been theoretically investigated under the influence of a time-varying high-intensity terahertz(THz)laser ***-perturbative Floquet theory is employed to solve the time-dependent equation of motion for the laser-driven excitonic quantum well *** response to the field parameters,such as intensity and frequency of the laser electric field on the state populations,can be used in various optical semiconductor device applications,such as photodetectors,sensors,all-optical switches,and terahertz emitters.

关键词： quantum well excitons terahertz non-perturbative multiphoton laser Floquet

Sustainable Integrated Inventory Model for Substitutable Deteriorating Items Considering Both Transport and Industry Carbon Emissions

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Journal of Systems Science and Systems Engineering 2022年第3期31卷 267-287页

作者： Ranu Singh vinod Kumar Mishra Department of Mathematics and Scientific Computing Madan Mohan Malaviya University of TechnologyGorakhpur-273010U.P.India

Sustainable integrated inventory management policy focuses on reducing the environmental impact of the manufacturing and transport *** study develops an integrated single-manufacturer single-buyer inventory model for substitutable deteriorating items considering transport and industry carbon *** article categorizes carbon emissions into two parts:direct and indirect *** also assume two mutually substitutable items,and substitution is considered on the buyer's *** one of the items is out of stock,the demand for that item can be partially satisfied by the stock of the other item;else,demand will be *** purpose of this study is to minimize the integrated cost of the supply chain with total carbon emissions produced by industry and transport sectors and to determine the optimal number of deliveries,order level and carbon emission quantity.A solution procedure is developed to find the optimal values of the *** experiments and sensitivity analyses are presented to demonstrate the proposed model.

关键词： Integrated inventory model sustainability deteriorating items substitutable items carbon emission

Spatial pattern analysis for quantification of landscape structure of Tadoba-Andhari Tiger Reserve,Central India

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Journal of Forestry Research 2014年第1期25卷 185-192页

作者： Ambica Paliwal vinod Bihari MathurWWF-India Secretariat

Landscape structure is often regarded as an important factor that governs the distribution and abundance of species. Therefore it is critical to understand the landscapes and their dynamics. Patterns of landscape elements strongly influence the ecological characteristics. This study was designed to document and map the current status of the tropi-cal dry deciduous forest of the Tadoba-Andhari Tiger Reserve （TATR）, Central India, （using IRS P6 LISS IV data） and to describe its landscape structure at three levels of organization viz. landscape, class, and patch. The study area was classified into 10 land cover classes that include 6 vegetation classes. The landscape structure was analyzed using FRAG-STATS using 12 set of indices. The TATR landscapes have a total of 2,307 patches with a mean patch size of 25.67 ha and patch density of 1.7 patches per km2. Amongst all land cover classes, mixed bamboo forest is dominant-it occupied maximum area （77.99%）-while riparian forest is least represented （0.32%）. Mixed forest has maximum number of patches among all vegetation classes. Results have shown that despite being dominant in the area, mixed bamboo forest has low patch density （0.25/100 ha）. Dominance of mixed bamboo forest is attributed to large patch sizes and not to the number of patches. This study has focussed on the approach of integrating satellite forest classification and forest inven-tory data for studying forest landscape patterns.

关键词： Spatial pattern analysis landscape structure FRAGSTATS IRS P6 LISS IV.

Co-gasification of coal and biomass an emerging clean energy technology: Status and prospects of development in Indian context

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International Journal of Mining Science and Technology 2019年第2期29卷 171-186页

作者： Alka D.Kamble vinod Kumar Saxena Prakash Dhondiram Chavan vinod Atmaram Mendhe Department of Chemical Engineering Indian Institute of Technology (ISM) CSIR-Central Institute of Mining and Fuel Research

Co-gasification of coal and biomass is emerging as potential clean fuel technology to achieve high thermodynamic efficiency with relatively low CO2 emission. The coal and biomass have been exclusively gasified more than a century to obtain gas–liquid fuels and the production of chemicals. Co-gasification has higher efficiency than the solitary coal gasification because the cellulose, hemicellulose and lignin content of biomass help to ignite and enhance the rate of gasification. It is suggested that the extensive research on carbon reactivity pattern, heat release, reaction kinetics, etc. may support to reduce the uncertainties in the co-gasification performance of coal and biomass blends, particularly in India. The prospects of co-gasification technology in Indian context have been discussed considering the abundance of varieties of coal and biomass. The suitability of existing gasifier procedures and their limitations with operating parameters like temperature, residence time, density optimisation, feed rate, agglomeration intensity, the tar formation and techno-economics involved are described. Also, this paper reviews the research highlights of the history of co-gasification and the advancement in upcoming challenges like a design of gasifier, access and preparation of biomass, disposal of residue, environmental concerns and reassurance to the operators for execution of large and small-scale projects.

关键词： Co-gasification Coal Biomass Clean fuel Advancement Challenges

Comparison of rectangular and circular bored twin tunnels in weak ground

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Underground Space 2019年第4期4卷 328-339页

作者： Michael vinod Hadi Khabbaz School of Civil and Environmental Engineering University of Technology Sydney(UTS)Australia

The recent innovation of a rectangular tunnel boring machine(TBM),and its use in the Hongzhuan Road tunnel underpass by the China Railway Engineering Group(CREG),has revitalized shallow depth soft soil *** paper presents the findings of a numerical study using PLAXIS to determine the surface settlements and moments produced in tunnel linings for circular and rectangular twin *** effects of the relative positions of twin tunnels,critical distances,volume losses,depths of burial,and tunnel sizes for both circular and rectangular tunnels are the key parameters of this *** results indicate that rectangular tunnels are suitable for shallow depths in weak ground as they have lesser settlement compared with circular *** is crucial for tunneling beneath important structures such as railway lines and existing ***,the maximum bending moment produced in the rectangular tunnel lining is higher than that for circular *** use of rectangular TBMs is an unconventional method in modern day tunneling;however,the analysis in this project recommends that tunnel industry engineers consider this method for shallow depth weak ground tunneling.

关键词： Twin tunnels Clay Numerical modeling Rectangular TBM

Zn^(2+) substituted superparamagnetic MgFe_(2)O_(4) spinel-ferrites:Investigations on structural and spin-interactions

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Journal of Advanced Ceramics 2020年第5期9卷 576-587页

作者： Lakshita PHOR Surjeet CHAHAL vinod KUMAR Department of Physics Deenbandhu Chhotu Ram University of Science and TechnologyMurthal 131039HaryanaIndia

Nano-magnetic ferrites with composition Mg_(1-x)Zn_(x)Fe_(2)O_(4)(x=0.3,0.4,0.5,0.6,and 0.7)have been prepared by coprecipitation method.X-ray diffraction(XRD)studies showed that the lattice parameter was found to increase from 8.402 to 8.424A with Zn^(2+) ion content from 0.3 to *** transform infrared(FTIR)spectra revealed two prominent peaks corresponding to tetrahedral and octahedral at around 560 and 430 cm^(-1) respectively that confirmed the spinel phase of the *** electron microscopy(TEM)images showed that the particle size was noted to increase from 18 to 24 nm with an increase in Zn content from x=0.3 to *** magnetic properties were studied by vibrating sample magnetometer(VSM)and electron paramagnetic resonance(EPR)which ascertained the superparamagnetic behavior of the samples and contribution of superexchange *** maximum magnetization was found to vary from 23.80 to 32.78 emu/g that increased till x=0.5 and decreased ***,X-ray photoelectron spectroscopy(XPS)was employed to investigate the chemical composition and substantiate their oxidation states.

关键词： nanoparticles(NPs) nanospinel ferrites structural properties magnetism coprecipitation method

Optimization of Distributed Solar Photovoltaic Power Generation in Day-ahead Electricity Market Incorporating Irradiance Uncertainty

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Journal of Modern Power Systems and Clean Energy 2021年第3期9卷 545-560页

作者： Anu Singla Kanwardeep Singh vinod Kumar Yadav the Department of Electrical Engineering Chitkara University Institute of Engineering and TechnologyChitkara UniversityPunjabIndia the Department of Electrical Engineering Guru Nanak Dev Engineering CollegeLudhianaIndia(affiliated to I.K.Gujral Punjab Technical UniversityKapurthalaIndia) the Department of Electrical Engineering Delhi Technological UniversityDelhiIndia

This paper proposes a simple and practical approach to model the uncertainty of solar irradiance and determines the optimized day-ahead(DA)schedule of electricity *** problem formulation incorporates the power output of distributed solar photovoltaic generator(DSPVG)and forecasted load demands with a specified level of *** proposed approach determines the certainty levels of the random variables(solar irradiance and forecasted load demand)from their probability density function *** this process of optimization,the energy storage system(ESS)has also been mod-eled based on the fact that the energy stored during low locational marginal price(LMP)periods and dispatched during high LMP periods would strengthen the economy of DA *** objective of the formulated non-linear optimization problem is to maximize the social welfare of market participants,which incorporates the assured generation outputs of DSPVG,subject to real and reactive power balance and transmission capability constraints of the system and charging/dis-charging and energy storage constraints of *** simulation has been performed on the Indian utility 62-bus *** results are presented with a large number of cases to demonstrate the effectiveness of the proposed approach for the efficient,economic and reliable operation of DA electricity markets.

关键词： Electricity market energy storage market dispatching renewable energy social welfare solar photovoltaic power generator

Optimal Simultaneous Allocation of Electric Vehicle Charging Stations and Capacitors in Radial Distribution Network Considering Reliability

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Journal of Modern Power Systems and Clean Energy 2024年第5期12卷 1584-1595页

作者： B.vinod Kumar Aneesa Farhan M A the Department of Electrical and Electronic Engineering National Institute of Technology TiruchirappalliTamilnaduIndia

The popularity of electric vehicles(EVs)has sparked a greater awareness of carbon emissions and climate *** mobility expansion and EV adoption have led to an increased infrastructure for electric vehicle charging stations(EVCSs),impacting radial distribution networks(RDNs).To reduce the impact of voltage drop,the increased power loss(PL),lower system interruption costs,and proper allocation and positioning of the EVCSs and capacitors are *** paper focuses on the allocation of EVCS and capacitor installations in RDN by maximizing net present value(NPV),considering the reduction in energy losses and interruption *** a part of the analysis considering reliability,several compensation coefficients are used to evaluate failure rates and pinpoint those that will improve *** locate the best nodes for EVCSs and capacitors,the hybrid of grey wolf optimization(GWO)and particle swarm optimization(PSO)(HGWO_PSO)and the hybrid of PSO and Cuckoo search(CS)(HPSO_CS)algorithms are proposed,forming a combination of GWO,PSO,and CS *** impact of EVCSs on NPV is also investigated in this *** effectiveness of the proposed optimization algorithms is validated on an IEEE 33-bus RDN.

关键词： Electric vehicle charging station optimization radial distribution network vehicle-to-grid loss reduction reliability