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Viability of a concentrated solar power system in a low sun belt prefecture

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Frontiers in Energy 2020年第4期14卷 850-866页

作者： Rahul bhattacharjee Subhadeep bhattacharjee Department of Electrical Engineering National Institute of Technology(NIT)AgartalaTripura Pin-799046India

Concentrating solar power(CSP)is considered as a comparatively economical,more efficient,and large capacity type of renewable energy ***,CSP generation is found restricted only to high solar radiation belt and installed where high direct normal irradiance is *** paper examines the viability of the adoption of the CSP system in a low sun belt region with a lower direct normal irradiance(DNI).Various critical analyses and plant economics have been evaluated with a lesser DNI *** obtained results out of the designed system,subjected to low DNI are not found below par,but comparable to some extent with the performance results of such CSP plants at a higher *** analysis indicates that incorporation of the thermal energy storage reduces the levelized cost of energy(LCOE)and augments the plant capacity *** capacity factor,the plant efficiency,and the LCOE are found to be 32.50%,17.56%,and 0.1952$/kWh,respectively.

关键词： concentrated solar power direct normal irradiance plant performance plant economics thermal energy storage

Rhyolites in continental mafic Large Igneous Provinces: Petrology,geochemistry and petrogenesis

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Geoscience Frontiers 2021年第1期12卷 53-80页

作者： Mahesh Halder debajyoti Paul Sarajit Sensarma Department of Earth Sciences Indian Institute of Technology KanpurKanpur 208016India Centre of Advanced Study in Geology University of LucknowLucknow 226007India

We present a detailed review of the petrological and geochemical aspects of rhyolite and associated silicic volcanic rocks(up to 20 vol%of all rocks)reported to date from twelve well known Phanerozoic continental mafic Large Igneous Provinces(LIPs).These typically spread over900℃.Rhyolites formed by significant crustal contribution are characterized by strong negative Nb-Ta anomalies,absence of clinopyroxene phenocrysts,and are likely to have a magma temperature<900℃.Geochemical signatures suggest rhyolite melt generation in the plagioclase stability field with a minor fraction originating from lower crustal depths.A large part of the compositional variability in rhyolites,particularly the SrNd-Pb-O isotope ratios,suggests a significant role of continental crust(upper crustal melting or AFC)in the evolution of these silicic rocks in the continental mafic LIPs.

关键词： Large Igneous Province Silicic rock Rhyolite Geochemistry Petrogenesis AFC

A new scheme of implementing all-optical logic systems exploiting material nonlinearity and polarization based encoding technique

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Optoelectronics Letters 2008年第3期4卷 172-176页

作者： debajyoti Samanta Sourangshu Mukhopadhyay Department of Physics The University of BurdwanGolapbagBurdwan -713104 West BengalIndia

In this letter,the authors propose a new concept of implementing all-optical logic gates by representing the logic states with polarization of an optical signal .As the state of polarization of the light signal is very much suitable for encoding and detecting the bits of data of a digital signal in communication,the scheme may extend some wide applications in all-optical parallel computation and information processing.

关键词：光学仪器逻辑系统非线性极化现象编码技术

A survey of density based clustering algorithms

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Frontiers of Computer Science 2021年第1期15卷 139-165页

作者： Panthadeep bhattacharjee Pinaki MITRA Department of Computer Science and Engineering Indian Institute of TechnologyGuwahati 781039India

Density based clustering algorithms(DBCLAs)rely on the notion of density to identify clusters of arbitrary shapes,sizes with varying *** surveys on DB-CLAs cover only a selected set of *** surveys fail to provide an extensive information about a variety of DBCLAs proposed till date including a taxonomy of the *** this paper we present a comprehensive survey of various DB-CLAS over last two decades along with their *** group the DBCLAs in each of the four categories:density definition,parameter sensitivity,execution mode and nature of*data and further divide them into various classes under each of these *** addition,we compare the DBCLAs through their common features and variations in citation and conceptual *** identify various application areas of DBCLAS in domains such as astronomy,earth sciences,molecular biology,geography,*** survey also identifies probable future directions of DBCLAs where involvement of density based methods may lead to favorable results.

关键词： clustering density based clustering survey classification common properties applications

Accumulation of Polyphenolic Compounds and Osmolytes under Dehydration Stress and Their Implication in Redox Regulation in Four Indigenous Aromatic Rice Cultivars

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Rice science 2020年第4期27卷 329-344页

作者： Nivedita DEY Soumen bhattacharjee Plant Physiology and Biochemistry Research Laboratory/University Grants Commission Centre for Advanced Study Department of BotanyUniversity of BurdwanBurdwan 713104West BengalIndia

Present work was undertaken to screen some drought tolerant indigenous aromatic rice cultivars(IARCs),commonly cultivated in West Bengal,India,based on their capacity to produce osmolytes,redox-sensitive phenolic acids and flavonoids,as contrivances for redox-regulation under drought *** glycol induced post imbibitional dehydration stress mediated changes in redox regulatory properties of the germinating seeds of the four IARCs(Jamainadu,Tulaipanji,Sitabhog,Badshabhog),which were assessed in terms of changes in prooxidant accumulation(in-situ localization of reactive oxygen species(ROS)by confocal microscopy,DCFDA(2′,7′-dichlorofluorescin diacetate)oxidation,O2-and H2O2 accumulation),cumulative antioxidative defense(radical scavenging property and total thiol content),ROS scavenging phenolic acids(gallic acid,protocatechuic acid,gentisic acid,para-hydroxy benzoic acid,chlorogenic acid,caffeic acid,syringic acid,salicylic acid,sinapic acid and p-coumaric acid)and flavonoids(catechin,naringin,rutin,quercetin,kaempferol,myricetin and apigenin).The capability of germinating seeds to accumulate osmolytes(like glycinebetaine,proline,soluble carbohydrates and K+ion)and polyphenolic compounds was also correlated with their corresponding redox status and redox biomarkers(conjugated diene,hydroperoxide,thiobarbituric acid reactive substances and free carbonyl content)produced under the same *** results in general showed that accumulation of osmolytes along with the redox-sensitive phenolics and flavonoids conferred the ability to maintain the redox homeostasis under drought stress for the tolerant IARCs(Badshabhog and Tulaipanji).

关键词： aromatic rice drought polyphenolic compounds osmolytes redox regulation

An HESS Based on a Modified MMCC-TSBC Converter Integrating Energy Storages

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CSEE Journal of Power and Energy Systems 2023年第5期9卷 1698-1709页

作者： Prabir Ranjan Kasari Subhadeep bhattacharjee the Department of Electrical Engineering of National Institute of Technology Agartala AgartalaTripura 799046India

This paper presents a modified modular multilevel cascaded converter based on a triple star bridge cell(MMCCTSBC)for integrating different types of energy storage to form a hybrid energy storage system(HESS).The proposed HESS comprises battery energy storage,supercapacitor energy storage and a doubly-fed induction machine(DFIM)based variable speed pump storage(VSPS).Different low-rated energy storage units can be intermixed in this converter to form an *** is possible due to the modular structure of the modified converter and provides an advantage in a high-power energy storage *** validate the performance of HESS,real-time power variation data is accumulated from online sources and a weighted median filter(WMF)is employed for generating appropriate references for battery energy storage system(BESS)and supercapacitor storage to mitigate both low frequency and high-frequency power ***,the control approach permits independent regulation of grid current and DFIM current through the modified MMCC-TSBC *** simulation and experimental results validate the effectiveness of the control scheme for the proposed HESS.

关键词： BESS DFIM MMCC supercapacitor storage,TSBC converter VSPS

Relative abundance of biotic communities of plankton and zoobenthos in three ox-bow lakes of Eastern India

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Chinese Journal of Oceanology and Limnology 2010年第4期28卷 874-880页

作者： CHAKRABARTY debajyoti BISWAS Probir DAS Sanjib Kumar Reader and Head Department of ZoologyKrishnagar Government College Department of Zoology Krishnagar Government College Waste Management Cell West Bengal Pollution Control BoardParibesh BhawanBidhan NagarBlock-LASalt Lake CitySector-Ⅲ

We made comparative studies of three tropical ox-bow lakes in India with different trophic *** species number of zooplanktons was negatively correlated with the degree of water eutrophication,and lakes of similar trophic status had higher similarity of *** most significant differences of species composition were observed with rotifers and *** density and biomass of phytoplankton,rotifers,oligochaetes and chironomids tended to increase with increasing *** observed a significant difference of dominant species in different waters,especially the eutrophic lake,which was dominated by a few species of *** abundance of Tanypus bilobatus showed a highly significant correlation with the degree of *** and zoobenthos showed considerably lower biodiversity in the eutrophic lake.

关键词： eutrophication ox-bow lake biodiversity plankton

Large-scale microfluidic gradient arrays reveal axon guidance behaviors in hippocampal neurons

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Microsystems & Nanoengineering 2017年第1期3卷 302-315页

作者： Nirveek bhattacharjee Albert Folch Department of Bioengineering University of Washington372015th Ave NEFoege N423-ASeattleWA 98195USA

High-throughput quantitative approaches to study axon growth behaviors have remained a *** have developed a 1024-chamber microfluidic gradient generator array that enables large-scale investigations of axon guidance and growth dynamics from individual primary mammalian neurons,which are exposed to gradients of diffusible *** microfluidic method(a)generates statistically rich data sets,(b)produces a stable,reproducible gradient with negligible shear stresses on the culture surface,(c)is amenable to the long-term culture of primary neurons without any unconventional protocol,and(d)eliminates the confounding influence of cell-secreted *** this platform,we demonstrate that hippocampal axon guidance in response to a netrin-1 gradient is concentration-dependent—attractive at higher concentrations and repulsive at lower *** also show that the turning of the growth cone depends on the angle of incidence of the *** study highlights the potential of microfluidic devices in producing large amounts of data from morphogen and chemokine gradients that play essential roles not only in axonal navigation but also in stem cell differentiation,cell migration,and immune response.

关键词： axon guidance microfluidic gradient microjet netrin-1 primary mammalian neuron

Performance Assessment of Partially Pre-fused Synthetic Flux in Basic Oxygen Steel Making

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Journal of Iron and Steel Research International 2015年第10期22卷 916-923页

作者： Jagannath PAL Satadal GHORAI debajyoti BANDYOPADHYAY Sukomal GHOSH CSIR-National Metallurgical Laboratory

Lump lime as the most common flux and iron ore as a coolant are used in basic oxygen steel making. However, high melting point, poor dissolution property, fines generation tendency and hygroscopic nature of lump lime often create problems in operation. As the combination of both iron oxide （Fe2O3） and CaO shows eutectic at 1 230 ℃, a combined mass of iron oxide and lime melts at lower temperature and dissolves faster in a molten bath. A partially pre-fused synthetic flux （PSF） was prepared through an innovative way in combination of iron oxide fines viz. Linz Donawitz converter sludge and blast furnace flue dust and lime fines by micro-pelletization of the mix followed by coke breeze free sintering. The developed PSF shows good cold handling strength, low melting point （1 180 ℃）, good thermal shock resistance, etc. As a low melting synthetic flux, its performance was assessed through dissolution/melting study in hot metal bath and refining of hot metal in a simulated bottom blown converter using （i） PSF, （ii） only lump lime and （iii） lump lime with iron ore when keeping other conditions identical. Very fast dissolution （27 80 s for 1-3 g lumps）, enhanced removal of C and P （11-12 min）, controlled slag foaming, and reduced oxygen consumption was obtained for using PSF.

关键词： synthetic flux melting refining basic oxygen converter