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Communications in Theoretical Physics 2024年第3期76卷 120-126页

作者： Ranjan Saikia Pragyan Phukan jayanta kumar sarma HEP laboratory Department of PhysicsTezpur UniversityTezpurAssam-784028India Department of Physics Moran CollegeMoranhatAssam-785670India

In this paper,the proton structure function F_(2)^(p)(x,Q^(2))at small-x is investigated using an analytical solution to the Balitsky–Kovchegov(BK)*** the context of the color dipole description of deep inelastic scattering(DIS),the structure function F_(2)^(p)(x,Q^(2))is computed by applying the analytical expression for the scattering amplitude N(k,Y)derived from the BK *** transverse momentum k and total rapidity Y,the scattering amplitude N(k,Y)represents the propagation of the quark-antiquark dipole in the color dipole description of *** the BK solution we extracted the integrated gluon density xg(x,Q^(2))and then compared our theoretical estimation with the LHAPDF global data fits,NNPDF3.1sx and ***,we have investigated the behavior of F_(2)^(p)(x,Q^(2))in the kinematic region of 10^(-5)≤x≤10^(-2)and 2.5 GeV^(2)≤Q^(2)≤60 GeV^(2).Our predicted results for F_(2)^(p)(x,Q^(2))within the specified kinematic region are in good agreement with the recent high-precision data for F_(2)^(p)(x,Q^(2))from HERA(H1 Collaboration)and the LHAPDF global parametrization group NNPDF3.1sx.

关键词： quantum chromodynamics(QCD) perturbative QCD(pQCD) proton structure function small-x Balitsky-Kovchegov equation

Small x phenomenology on gluon evolution through the BFKL equation in light of a constraint in multi-Regge kinematics

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Communications in Theoretical Physics 2020年第2期72卷 50-59页

作者： Pragyan Phukan Madhurjya Lalung jayanta kumar sarma HEP laboratory Department of PhysicsTezpur UniversityIndia

We investigate the impact of so-called kinematic constraint on gluon evolution at small *** the constraint on the real emission term of the gluon ladder diagram,we obtain an integro-differential form of the Balitsky-Fadin-Kuraev-Lipatov(BFKL)*** we solve the equation analytically using the method of *** sketch the Bjorken x and transverse momentum kt2 dependence of our solution of unintegrated gluon distributions f(x,kt2)in the kinematic constraint supplemented BFKL equation and contrasted the same with the original BFKL *** we extract the integrated gluon density xg(x,Q2)from unintegrated gluon distributions f(x,kt2)and compared our theoretical prediction with that of global data fits,namely NNPDF3.1 sx and *** we illustrate the phenomenological implication of our solution for unintegrated gluon distribution f(x,kT2)towards exploring high precision HERA DIS data by the theoretical prediction of proton structure functions(F2 and FL).

关键词： parton evolution equation gluon distribution function perturbative QCD

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

Soft-sediment deformation structures in the Mesoproterozoic Kaimur Sandstone,Vindhyan Supergroup(Central India),and their seismotectonic implications

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Journal of Palaeogeography 2023年第3期12卷 463-486页

作者： jayanta kumar Pati Anuj kumar Singh Department of Earth and Planetary Sciences Faculty of ScienceUniversity of AllahabadPrayagraj211002India National Centre of Experimental Mineralogy and Petrology 14 Chatham LinesUniversity of AllahabadPrayagraj211002India

The unequivocal identification of soft-sediment deformation structures(SSDS)is a significant attribute to constrain the effect of transient geological events in the spatio-temporal evolution of ancient sedimentary *** paper reports and discusses,for the first time,the occurrence of several cm-to dm-scale SSDS within sandstone successions of the Mesoproterozoic Kaimur Group(Vindhyan Supergroup),exposed at the Hanumandhara Hill of Chitrakoot-Satna border region,Madhya Pradesh State,*** SSDS are confined to a deformed interval comprising seven individual sedimentary units of variable composition and texture,which are sandwiched between nearly horizontally undeformed sandstone *** SSDS consist of load structures(load casts,flame structures,pseudonodules and ball-and-pillow structures),contorted lamination,convolute lamination,boudins and pinch-and-swell structures,deformed cross-stratification,slump structures,clastic injections,fluid escape structures,and syn-sedimentary fractures/*** pre-sent study suggests that the formation of these SSDS is essentially related to a combination of processes(gravitational instability,liquefaction,fluidization,and fluid escape)predominantly induced by seismic *** addition,the restricted occurrence of fractures/faults in these deformed layers emphasizes the passage of seismically-induced Rayleigh *** the observed types of SSDS,their lateral homo-geneity and geographic distribution along with the geodynamic framework of the Vindhyan Basin,the whole area can be tentatively attributed to having experienced moderate-to high-magnitude(M≥5)*** present study combined with earlier reports of seismically-induced SSDS,from other regionally disposed formations belonging to the Lower(e.g.,Kajrahat Limestone,Chopan Porcellanite,Koldaha Shale,Rohtas Limestone,and Glauconitic Sandstone of the Semri Group)and Upper(e.g.,Bhander Limestone of the Bhander Group)Vindhyan Supergroup,respectively,provi

关键词： Soft-sediment deformation structures SSDS Seismites Kaimur Group Vindhyan Basin Sand-stone Central India

Multipliers on Vector-valued L^1-spaces for Hypergroups

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Acta Mathematica Sinica,English Series 2018年第7期34卷 1059-1073页

作者： R.sarma N.Shravan kumar Vishvesh kumar Department of Mathematics Indian Institute of Technology Delhi

In this article, we extend the well known Wendel＇s theorem to the context of vector-valued L1-spaces on hypergroups. In this regard, various cases have been studied.

关键词： Vector-valued Ll-spaces hypergroups multipliers translation invariant operators Fouriertransform

Dynamic characterization of the migration of a mining pit in an alluvial channel

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International Journal of Sediment Research 2019年第2期34卷 155-165页

作者： Bandita Barman Bimlesh kumar Arup kumar sarma Department of Civil Engineering Indian Institute of Technology Guwahati

Research on in-channel sand mining is imperative as it may have a significant impact on channel *** this quest to quantitatively comprehend the phenomenon,experimental studies were done to investigate the dynamic characteristics of the migration of a mining *** evaluation of the migration rate of a mining pit in a physical scale model has found a rise in the migration rate of the pit's upstream edge with increasing discharge.A wavelet analysis applied for analyzing scale-dependent migration of the bed profile of a mining pit also revealed similar ***,the wavelet analysis examined the length-scale dependent migration of a mining pit and a decrease in the migration rate has been observed with an increase in the length *** plan form of a pit(length-to-width ratio)governs the erosion and deposition processes around the *** physical and statistical approaches show an increase in the migration rate with an increase in the length-to-width ratio of the *** empirical formulation has been developed for calculating the migration rate of the upstream edge of a mining pit based on pit geometry(length-to-width ratio),average flow velocity,and critical shear stress of the bed *** results also show a higher bed load transport rate in the channel subjected to mining as compared to a plain bed channel.

关键词： Sand mining Migration Wavelet analysis Bed load transport

An EOQ model with backordering for perishable items under multiple advanced and delayed payments policies

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Journal of Management Analytics 2022年第3期9卷 403-434页

作者： Prasanta kumar Ghosh Amalesh kumar Manna jayanta kumar Dey Samarjit Kar Department of Mathematics National Institute of Technology DurgapurDurgapurIndia Department of Mathematics The University of BurdwanBurdwanIndia Department of Mathematics Mahishadal Raj CollegePurba MedinipurIndia Department of Mathematics Y.S.Palpara MahavidyalayaPurba MedinipurIndia

This study investigated an economic order quantity (EOQ) model with completebackorder for fixed lifetime perishable items under multiple advance and delayedpayments policies. Here, a new type of business policy is consideredwhere supplieroffers the retailer to pay a fraction of the purchasing cost before the order deliverybymultiple equal installments starting from the ordering time and the rest amountafter the delivery by multiple equal installments. Here, some theoretical results areillustrated to determine the conditions of existence and uniqueness of the optimalsolutions. A closed form solution is determined to solve the proposed model underapproximation. Some numerical examples are provided to examine the validity ofthe proposed model. Finally, sensitivity analyses are presented to obtain the effectof optimal policy and provide some managerial insights of the model.

关键词： inventory perishable item expiry date advance payment delayed payment

The evolution of graphene-based electronic devices

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International Journal of Smart and Nano Materials 2010年第3期1卷 201-223页

作者： Joydeep Basu jayanta kumar Basu Tarun Kanti Bhattacharyya Department of Electronics and Electrical Communication Engineering Department of Chemical Engineering Indian Institute of TechnologyKharagpur 721302India

Successful isolation of single-layer graphene,the two-dimensional allotrope of carbon from graphite,has fuelled a lot of interest in exploring the feasibility of using it for fabrication of various electronic devices,particularly because of its exceptional electronic *** is poised to save Moore’s law by acting as a successor of silicon-based *** article reviews the success story of this allotrope with a focus on the structure,properties and preparation of graphene as well as its various device applications.

关键词： electronic device FET field effect graphene nanoelectronics

A BCH code assisted modified NCO based LSPF-DPLL topology for Nakagami-m, Rayleigh and Rician fading channels

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Digital Communications and Networks 2019年第2期5卷 102-110页

作者： Sabyasachi Bhattacharyya Aradhana Misra Kandarpa kumar sarma Department of Electronics and Telecommunication Engineering Barak Valley Engineering CollegeNiralaKarimganj 788701AssamIndia Department of Electronics and Communication Engineering Gauhati UniversityGopinath Bordoloi NagarJalukbariGuwahati 781014AssamIndia Department of Electronics and Communication Technology Gauhati UniversityGopinath Bordoloi NagarJalukbariGuwahati 781014AssamIndia

In spite of the rapid developments in communication technologies over the past few decades, which include attractive features offered by the presently used 3G/4G systems,让 continues to be a challenge to render adequate services with the exponential rise in the number of users and applications. However, efficient alternatives, including 5G methods, are being explored to mitigate this problem. Such systems also aspire to render sustained coverage with lesser constraints on power and Quality of Service (QoS). Today, versatile Digital Phase Locked Loop (DPLL) based packages find place as communication receivers. Of late, a Least Square Polynomial Fitting DPLL (LSPF-DPLL) with Modified Phase Resolving Numerically Controlled Oscillator (MPR-NCO), which demonstrates excellent time performance and maintains satisfactory error rates, was proposed. A Bose, Chaudhuri, and Hocquenghem (BCH) channel code assisted version of the MPR-NCO based LSPF-DPLL system is presented here. The proposed system exhibits better B让 Error Rate (BER), throughput, and baud rate levels over the previously proposed uncoded version.

关键词： Coding Fading Frequency tracking Least squares Phase recovery

Phenomenological modelling of flow behaviour of 20MnMoNi55 reactor pressure vessel steel at cryogenic temperature with different strain rates

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Defence Technology（防务技术） 2019年第3期15卷 326-337页

作者： Swagatam Paul Partha Dey Snehasish Bhattacharjee Sanjib kumar Acharyya Prasanta Sahoo jayanta Chattopadhyay Department of Mechanical Engineering Jadavpur University Kolkata India Department of Mechanical Engineering Academy of Technology Hooghly West Bengal India Bhaba Atomic Research Centre Mumbai India

In the present study a phenomenological constitutive model is developed to describe the flow behaviour of 20MnMoNi55 low carbon reactor pressure vessel (RPV) steel at sub-zero temperature under different strain rates. A set of uniaxial tensile tests is done with the variation of strain rates and temperature ranging from 10^-4s^-1 to 10^-1s^-1 and -80℃ to 140℃ respectively. From the experimental data, family of flow curves at different temperatures and strain rates are generated and fitted exponentially. The strain rate and temperature dependence of the coefficients of the exponential flow curves are extracted from these curves and characterised through a general phenomenological constitutive coupled equation. The coefficients of this coupled equation are optimised using genetic algorithm. Finite element simulation of tensile tests at different strain rates and temperatures are done using this coupled equation in material model of Abaqus FEA software and validated with experimental results. The novelties of proposed model are:(a) it can predict precisely the flow behaviour of tensile tests (b) it is a simple form of equation where fitting parameters are both function of strain rate ratio and temperature ratio,(c) it has ability to characterize flow behaviour with decreasing subzero temperatures and increasing strain rates.

关键词： Flow behaviour RPV steel Cryogenic temperature Strain rate