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Electronic Structure of Helium Atom in a Quantum Dot

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Communications in Theoretical Physics 2016年第3期65卷 347-353页

作者： jayanta k.saha S.Bhattacharyya T.k.Mukherjee Indian Association for the Cultivation of Science Jadavpur Kolkata 700032 India Aliah University IIA/27 New Town Kolkata 700156 India Acharyya Prafulla Chandra College New Barrackpore Kolkata 700131 India Narula Institute of Technology Agarpara Kolkata 700109 India

Bound and resonance states of helium atom have been investigated inside a quantum dot by using explicitly correlated Hylleraas type basis set within the framework of stabilization *** be specific,precise energy eigenvalues of bound 1sns(~1S^e)(n=1-6)states and the resonance parameters *** and widths of^lS^e states due to 2sns(n=2-5)and 2pnp(n=2-5)configurations of confined helium below N=2 ionization threshold of He^+have been *** two-parameter(Depth and Width)finite oscillator potential is used to represent the confining potential due to the quantum *** has been explicitly demonstrated that the electronic structural properties become sensitive functions of the dot *** is observed from the calculations of ionization potential that the stability of an impurity ion within a quantum dot may be manipulated by varying the confinement parameters.A possibility of controlling the autoionization lifetime of doubly excited states of two-electron ions by tuning the width of the quantum cavity is also discussed here.

关键词： helium atom variational method quantum dot correlation

Ultra-small amorphous MoS2 decorated reduced graphene oxide for supercapacitor application

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Journal of Materials Science & Technology 2020年第5期40卷 196-203页

作者： Poulami Hota Milon Miah Saptasree Bose Diptiman Dinda Uttam k.Ghorai Yan-kuin Su Shyamal k.saha Department of Materials Science Indian Association for the Cultivation of ScienceJadavpurKolkata700032India Department of Materials Science and Engineering Seoul National UniversitySeoul151-744Republic of Korea Department of Industrial Chemistry and Applied Chemistry Ramakrishna Mission Vidyamandira and Swami Vivekananda Research CenterBelur MathHowrah711202India Green Energy Technology Research Center Kun Shan UniversityTainanTaiwanChina

Amorphous materials have recently gained much attention as electrode materials in supercapacitor application due to the presence of larger amount active sites which can efficiently increase the storage capacity of the *** engineering is an elegant approach to fully utilize the advantages of the amorphous ***,large surface area and high conductivity of reduced graphene oxide(RGO)can efficiently increase the storage capacity of the *** this idea,in the present work,we have successfully synthesized amorphous MoS2 of two different sizes on reduced graphene oxide and thoroughly investigated the supercapacitor behavior of the *** specific capacitance of the composite structures has been found to be largely increased with decreasing size of the amorphous nano *** specific capacitance of amorphous MoS2-RGO composite containing nearly 50 nm of MoS2 found to be 270 F/g whereas when the particle size is reduced to 5–7 nm,value of specific capacitance increases to 460 F/*** large increase in specific capacitance with the tuning of the size of amorphous nano particle has been explained by the presence of a large number of active sulfur edges of ultra-small MoS2 nano structure along with the better charge transport which can effectively increase the storage capacity of the overall *** retention in the capacitance of the material has been found to be 90%after 5000 cycles.

关键词： Supercapacitor Ultrasmall amorphous MoS2 nanoparticles Sulfur edge sites Reduced graphene oxide(RGO) Specific capacitance

On image transformation for partial discharge source identification in vehicle cable terminals of high-speed trains

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High Voltage 2024年第5期9卷 1090-1100页

作者： kai Liu Shibo Jiao Guangbo Nie Hui Ma Bo Gao Chuanming Sun Dongli Xin Tapan k.saha Guangning Wu School of Electrical Engineering Southwest Jiaotong UniversityChengduChina Power and Energy Systems Research Group The University of QueenslandBrisbaneQueenslandAustralia

Partial discharge(PD)detection of cable terminals is crucial for the safe operation of the traction power system in ***,similar PD signals in complex train-operating environments cause difficulty to recognise the insulation ***,a PD signal image transformation recognition method is proposed for PD detection of cable terminal defects to identify defects in cable terminals with similar PD characteristics *** the proposed method,the raw PD signals are firstly transformed to images via the Gramian angular field(GAF)*** can reveal the discriminative characteristics embedded in the original PD signals and subsequently facilitate differentiating the PD sources,which exhibit similar characteristic in the time *** obtained GAF representation of PD signals(named as PD GAF images)is extracted from local and global features to train an efficient MobileVIT model,which is then utilised to identify similar types of PD sources in cable *** results show that the proposed method achieves 97.5%recognition accuracy in the field experiment,which is superior to other methods.

关键词： image transformation cable

Performance behaviour of elliptical-bore journal bearings lubricated with solid granular particulates

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Particuology 2016年第4期14卷 51-60页

作者： Faisal Rahmani jayanta k. Dutt Raj k. Pandey Department of Mechanical Engineering Indian Institute of Technology Delhi New Delhi 110016 India

Journal bearings operating in hot environments and at high temperatures experience accelerated degra- dation of lubricating oils. In such situations, dry granular particulates have emerged as potential media for providing lubrication in journal bearings in place of lubricating oils. Granular particulates do not degrade thermally, even at considerably high temperatures. This work explores the static and dynamic perfor- mance characteristics of elliptical-bore journal bearings lubricated with granular particulates. It is found that a bearing lubricated with a larger size （2 μm） particles offers better performance compared with that using smaller size （1μm） particles. Bore ellipticity reduces the load-carrying capacity and increases side leakage and the coefficient of friction; however, rotor stability is marginally improved at low eccentricity ratios （〈0.6）, followed by significant improvement at high eccentricity ratios （〉0.6）.

关键词： Particulate Journal bearing Grain size Rigid rotor stability Hydrodynamic lubrication

Influence of light and habitat on predation of Culex quinquefasciatus （Diptera： Culicidae）larvae by the waterbugs （Hemiptera： Heteroptera）

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Insect Science 2008年第5期15卷 461-469页

作者： Nabaneeta saha Gautam Aditya Animesh Bal Goutam k. saha Department of Zoology University of Calcutta Zoological Survey of India Kolkata Department of Zoology The University of Burdwan Golapbag Burdwan India

The influence of light and habitat structure on the predation of Culex quinquefasciatus larvae by the common heteropteran water bug, Diplonychus （= Sphaerodema） annulatus, D. rusticus and Anisops bouvieri was assessed in the laboratory. It was revealed that water bugs predate more in presence of light than in dark conditions. While A. bouvieri consumed more prey in structured conditions, D. annulatus and D. rusticus consumed more prey in open conditions. The selection of prey size as well as the respective numbers varied between predators and treatments significantly. Prey vulnerability （PV）, an indicator of predatory efficiency, was highest for D. annulatus, moderate for D. rusticus and low for A. bouvieri. Prey consumption and PV values under different treatment conditions indicate that for belostomatid water bugs D. annulatus and D. rusticus, the order of prey consumption under different habitat and light/dark combinations is light open 〉 dark open 〉 light vegetated 〉 dark vegetated. In the case of the backswimmer, A. bouvieri, the order of prey consumption appeared to be light structured 〉 dark structured 〉 light open 〉 dark open. These findings were consistent with resource-partitioning by water bug species sharing the same guild. If the observed results are extended to natural settings the efficiency of these predators in controlling mosquito populations will vary with the structural complexity of habitats and the intensity of light.

关键词： Belostomatidae biological control Culex quinquefasciatus larva Notonectidae predation

Nil Clean Graphs of Rings

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Algebra Colloquium 2017年第3期24卷 481-492页

作者： Dhiren kumar Basnet jayanta Bhattacharyya Department of Mathematical Sciences Tezpur University Napaazn Tezpur-784028 Assam India

In this article, we define the nil clean graph of a ring R. The vertex set is the ring R, and two ring elements a and b are adjacent if and only if a ＋ b is nil clean in R. Graph theoretic properties like the girth, ... 详细信息

关键词： nil clean ring weak nil clean ring nil clean graph

Recursive dynamics simulator(ReDySim):A multibody dynamics solver

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Theoretical & Applied Mechanics Letters 2012年第6期2卷 71-76页

作者： Suril V.Shah Paramanand V.Nandihal Subir k.saha Department of Mechanical Engineering McGill University QC H3A0C3Canada Department of Mechanical Engineering Indian Institute of Technology New Delhi 110016India

Recursive formulations have significantly helped in achieving real-time computations and model-based control laws. The recursive dynamics simulator （ReDySim） is a MATLAB-based recur- sive solver for dynamic analysis of multibody systems. ReDySim delves upon the decoupled natural orthogonal complement approach originally developed for serial-chain manipulators. In comparison to the commercially available software, dynamic analyses in ReDySim can be performed without creating solid model. The input parameters are specified in MATLAB environment. ReDySim has capability to incorporate any control algorithm with utmost ease. In this work, the capabilities of ReDySim for solving open-loop and closed-loop systems are shown by examples of robotic gripper, kUkA kR5 industrial manipulator and four-bar mechanism. ReDySim can be downloaded for free from http：//*** and can be used almost instantly.

关键词： ReDySim multibody systems dynamic modeling recursive dynamics DeNOC

Geochemical characteristics of Neogene sandstones of the East and West Siang Districts of Arunachal Pradesh,NE India:implications for source-area weathering,provenance,and tectonic setting

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Acta Geochimica 2022年第1期41卷 100-120页

作者： Roshmi Boruah jayanta Jivan Laskar Department of Geological Sciences Gauhati UniversityGuwahatiAssam 781014India

Sandstones from the Neogene Siwalik successions of the East and West Siang Districts of Arunachal Pradesh were analyzed to evaluate source-area weathering,provenance,and tectonic setting by using major,trace,and rare earth elements(REEs)as *** sandstones are classified as lithic arenite and wacke arenite based on their mineralogical *** values of different weathering indices such as Chemical Index of Alteration(CIA;60.93–89.86)and Chemical Index of Weathering(CIW;40–96.8)suggest moderate to intense weathering in the source *** plot of Th/Sc versus Zr/Sc indicates enrichment of zircon by sediment sorting and/or recycling from a weathered *** high positive correlation between Al2 O_(3) and k2 O points towards a strong influence of the constituent clay minerals on the major oxide composition of the *** analysis together with enriched LREE,flat HREE,negative Eu anomalies(Eu/Eu^(*)=0.47 to 0.90)in the chondrite-normalized diagrams,and the ratios of La/Sc,La/Co,Th/Sc,Th/Co,Cr/Th collectively suggests that the Neogene sediments were derived from felsic igneous and/or reworked sedimentary/metasedimentary sources in an upper continental crustal *** geochemical characteristics of the studied Neogene Siwalik sandstones indicate that the sediments were sourced from pre-Himalayan gneisses and granitoids together with metabasic rocks,which had formed in a passive margin tectonic setup.

关键词： Geochemistry Neogene sandstones Arunachal Pradesh Paleo-weathering Provenance Tectonic setting

Twin lintel belt in steel for seismic strengthening of brick masonry buildings

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Earthquake Engineering and Engineering Vibration 2004年第2期3卷 215-222页

作者： C.V.R.Murty jayanta Dutta S.k.Agrawal Department of Civil Engineering Indian Institute of Technology KanpurKanpur 208016India professor Department of Civil Engineering Indian Institute of Technology KanpurKanpur 208016India Formerly Graduate student Structural Engineering Research Division Central Building Research InstituteRoorkee 247667India Senior Assistant Director

A single-room,single-storey full-scale brick masonry building with precast RC roofing system was tested thrice under displacement controlled lateral cyclic loading,to assess the effectiveness of the basic repair and seismic strengthening ***,the virgin building specimen was loaded laterally to f^*** the second stage,the damaged building was repaired by stitching across the cracks,and tested under the same lateral *** the third stage,the twice-damaged structure was repaired once more by stitching and strengthened by twin lintel belt in steel and vertical comer reinforcement, and *** building strengthened by twin lintel belt in steel showed about 28% higher strength under lateral loading than the virgin building.

关键词： brick masonry building seismic strengthening twin lintel belt quasi-static lateral cyclic loading