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Journal of Modern Power Systems and Clean Energy 2021年第6期9卷 1468-1477页

作者： Subrat kumar Pradhan Dushmanta kumar Das Department of Electrical and Electronics Engineering National Institute of Technology Nagaland

This paper proposes a delay discretization based H∞load frequency control strategy for interconnected power *** effect of time delay is considered in the system for the design of stabilizing *** improve the tolerable delay margin of the system,a two-term state feedback controller structure is *** controller requires delayed state information as control *** the proposed approach,the amount of delay introduced in the state of the system,i.e.,artificial delay,for taking control action is assumed to be *** approach is based on the discretization of this delay *** order to define a simple Lyapunov-Krasovskii(LK)function for each of the discretized interval,a stabilization criterion is developed in such a way that a single one satisfies the requirement of all the *** developed criterion is computationally simple and efficient.

关键词： Interconnected power system load frequency control(LFC) state feedback controller time delay

Pressure recovery characteristics for a dilute gas-particle suspension flowing vertically downward in a pipe with a sudden expansion: A two-fluid modeling approach

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Particuology 2020年第3期18卷 100-111页

作者： Santosh kumar Senapati Sukanta kumar Dash Department of Mechanical Engineering Indian Institute of Technology KharagpurWest Bengal 721302India

This work applies the Eulerian-Eulerian model in conjunction with the kinetic theory of granular flow and inter-particle collisions to study the characteristics of pressure recovery for a dilute gas-particle suspension flowing through a pipe with a sudden expansion at a relatively higher solid *** do so,the numerical procedure was validated against experimental results for relatively small dilute phase flows in a pipe with a sudden expansion;a satisfactory agreement was ***,the effect of the two significant numerical parameters namely,the speculairty coefficient and the coefficient of restitution for particle-particle collisions were investigated and then,for fixed combinations of these parameters the effect of particle-phase volume fraction,particle density,particle size,and inlet slip ratio were *** was concluded that pressure recovery diminishes as the speculairty coefficient increases and the particle-particle coefficient of restitution *** recovery was found to increase with increasing solid volume fraction for coarse particles whereas,for fine particles,a critical volume fraction is obtained above which pressure recovery *** increase in slip ratio is found to diminish pressure ***,at relatively higher solid volume fractions,a critical diameter was found,above and below which pressure recovery decreases.

关键词： Gas-solid flow Sudden expansion pipe Eulerian-Eulerian model Pressure recovery Vertically downward flow

A Hybrid Moth Flame Optimization Algorithm for Global Optimization

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Journal of Bionic Engineering 2022年第5期19卷 1522-1543页

作者： Saroj kumar Sahoo Apu kumar Saha Department of Mathematics National Institute of TechnologyAgartalaTripura 799046India

The Moth Flame Optimization(MFO)algorithm shows decent performance results compared to other meta-heuristic algorithms for tackling non-linear constrained global optimization ***,it still suffers from obtaining quality solution and slow convergence *** the other hand,the Butterfly Optimization Algorithm(BOA)is a comparatively new algorithm which is gaining its popularity due to its simplicity,but it also suffers from poor exploitation *** this study,a novel hybrid algorithm,h-MFOBOA,is introduced,which integrates BOA with the MFO algorithm to overcome the shortcomings of both the algorithms and at the same time inherit their *** performance evaluation,the proposed h-MFOBOA algorithm is applied on 23 classical benchmark functions with varied *** tested results of the proposed algorithm are compared with some well-known traditional meta-heuristic algorithms as well as MFO *** rank test and Wilcoxon signed rank test are employed to measure the performance of the newly introduced algorithm *** computational complexity has been ***,the proposed algorithm has been applied to solve one constrained and one unconstrained real-life problems to examine its problem-solving capability of both type of *** comparison results of benchmark functions,statistical analysis,real-world problems confirm that the proposed h-MFOBOA algorithm provides superior results compared to the other conventional optimization algorithms.

关键词： Moth fame optimization algorithm Butterfly optimization algorithm Bio-inspired Benchmark functions Friedman rank test

Wind environment around the setback building models

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Building Simulation 2021年第5期14卷 1525-1541页

作者： Amlan kumar Bairagi Sujit kumar Dalui Department of Civil Engineering Indian Institute of Engineering Science and TechnologyShibpurHowrahIndia

The irregular shape of buildings always tenders an enormous challenge to the *** wind velocity at the pedestrian level has a specific approach from a comfortable point of *** investigation highlighted the characteristic of the pedestrian level wind velocity for distinct types of asymmetrical setback *** passed study explored the pedestrian level effect for the axisymmetric models,while this study is based on the models that have symmetry about a single *** study investigates the pedestrian level flow fluctuation of setback models with single and double side setbacks at multiple *** double-side double setback buildings are efficient to reduce 28%-30%velocity in front of the building and 68%-70%velocity behind the *** it suggests that the double side double setback building is efficient to maintain the velocity at the pedestrian level,roof level,and backside of the *** setback building can easily control the frequency of fluctuating velocity at downstream flow for both along and across wind conditions.

关键词： amplification factor pedestrian level flow setback model velocity spectra wind environment computational fluid dynamics(CFD)

Systematic Study on System Size Dependence of Global Stopping： Role of Momentum-Dependent Interactions and Symmetry Energy

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Chinese Physics Letters 2010年第6期27卷 74-77页

作者： Sanjeev kumar Suneel kumar School of Physics and Material Science Thapar University Patiala-147004 Punjab lndia

Using the isospin-dependent quantum molecular dynamical model, we systematically study the role of symme- try energy with and without momentum-dependent interactions on the global nuclear stopping. We simulate the reactions by varying the total mass of the system from 80 to 394 at different beam energies from 30 to 1000 Me V/nucleon over central and semi-central geometries. The nuclear stopping is found to be sensitive towards the momentum-dependent interactions and symmetry energy at low incident energies. The momentum-dependent interactions are found to weaken the finite size effects in nuclear stopping.

关键词： Centralization Energy

Antibiotic resistome of Salmonella typhi:molecular determinants for the emergence of drug resistance

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Frontiers of Medicine 2021年第5期15卷 693-703页

作者： Awanish kumar Anil kumar Department of Biotechnology National Institute of TechnologyRaipur-492010(Chhattisgarh)India

Resistome is a cluster of microbial genes encoding proteins with necessary functions to resist the action of *** governs essential and separate biological functions to develop resistance against *** widespread clinical and nonclinical uses of antibiotics over the years have combined to select antibiotic-resistant determinants and develop resistome in *** present,the emergence of drug resistance because of resistome is a significant problem faced by clinicians for the treatment of Salmonella *** resistome is a dynamic and ever-expanding component in *** foundation of resistome in Salmonella is laid long before;therefore,the antibiotic resistome of Salmonella is reviewed,discussed,and *** have searched the literature using PubMed,MEDLINE,and Google Scholar with related key terms(resistome,Salmonella,antibiotics,drug resistance)and prepared this *** this review,we summarize the status of resistance against antibiotics in ***,highlight the seminal work in the resistome of *** and the genes involved in the antibiotic resistance,and discuss the various methods to identify *** resistome for the proactive identification of this infection and quick diagnosis of the disease.

关键词： S.typhi antibiotic resistance mechanism resistome identification methods

ηmesons in hot magnetized nuclear matter

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Chinese Physics C 2022年第2期46卷 160-177页

作者： Rajesh kumar Arvind kumar Department of Physics Dr.B R Ambedkar National Institute of Technology JalandharJalandhar-144011PunjabIndia

ηN interactions are investigated in hot magnetized asymmetric nuclear matter using the chiral SU(3)model and chiral perturbation theory(ChPT).In the chiral modcl,thc in-medium properties of η-mesons are calcu-lated using medium modified scalar densities under the influence of an extermal magnetic ***,in a com-bined chiral model and ChPT approach,off-shell contributions of the ηN interactions are evaluated from the ChPTeffective ηN Lagrangian,and the in-medium effect of scalar densities are incorporated from the chiral SU(3)*** find that the magnetic field has a significant effect on the in-medium mass and optical potential of η mesons,andwe observe a deeper mass-shift in the combined chiral model and ChPT approach than in the solo chiral SU(3)*** both approaches,no additional mass-shift is observed due to the uncharged nature of η mesons in the presenceof a magnetic field.

关键词： hadron physics ηinteractions in-medium mesons

Estimation of composite load model with aggregate induction motor dynamic load for an isolated hybrid power system

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Frontiers in Energy 2015年第4期9卷 472-485页

作者： Nitin kumar SAXENA Ashwani kumar SHARMA Deptment of Electrical Engineering NIT Kumkshetra Haryana 136119 India

It is well recognized that the voltage stability of a power system is affected by the load model and hence, to effectively analyze the reactive power compensation of an isolated hybrid wind-diesel based power system, the loads need to be considered along with the generators in a transient analysis. This paper gives a detailed mathematical modeling to compute the reactive power response with small voltage perturbation for composite load. The composite load is a combination of the static and dynamic load model. To develop this composite load model, the exponential load is used as a static load model and induction motors （IMs） are used as a dynamic load model. To analyze the dynamics of IM load, the fifth, third and first order model of IM are formulated and compared using differential equations solver in Matlab coding. Since the decentralized areas have many small consumers which may consist large numbers of IMs of small rating, it is not realistic to model either a single large rating unit or all small rating IMs together that are placed in the system. In place of using a single large rating IM, a group of motors are considered and then the aggregate model of IM is developed using the law of energy conservation. This aggregate model is used as a dynamic load model. For different simulation studies, especially in the area of voltage stability with reactive power compensation of an isolated hybrid power system, the transfer function AQ/AV of the composite load is required. The transfer function of the composite load is derived in this paper by successive derivation for the exponential model of static load and for the fifth and third order IM dynamic load model using state space model.

关键词： isolated hybrid power system (IHPS) compo- site load model static load dynamic load induction motorload model aggregate load

Estimation of discharge and its distribution in compound channels

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Journal of Hydrodynamics 2014年第1期26卷 144-154页

作者： MOHANTY Prabir kumar KHATUA Kishanjit kumar Department of Civil Engineering National Institute of TechnologyRourkelaOrissaIndia

Results of research into a compound channel having width ratio （a） in excess of 11 are presented in the form of boun-dary shear distributions across the compound cross section. New relationship is derived between the percentage of shear carried by the flood plains （%S fp ） and the percentage of area occupied by the flood plains （%Afp ） . The equation so derived is taken as the basis to develop a new methodology to predict the stage discharge relationship specifically for wide compound channels using Darcy＇s friction factor （ f ） for the main channel and flood plain regions. The methodology also is used for compound channels with smaller width ratios by applying the appropriate relation for %S fp derived earlier by different researchers and seems to work well. Next, as a corollary to the methodology, separate formulae are proposed to estimate flow distribution in main channel and flood plain regions. The proposed method and its corollary are tested for their validity against well-published small-scale data series of pre-vious researchers along with some large-scale data series from EPSRC-FCF （A-Series） compound channel experiments and very good agreement is observed between the measured values and predicted values for total flow as well as zonal distribution of flow. The methodology is also applied to some compound river section data published in literature and is found to serve well the purpose of predicting flow in real world application. This new method gives the least RMS value of error for discharge prediction compared with some other well-known methods used for estimating stage-discharge relation in compound channels by considering all data sets.

关键词： compound channels boundary shear stage-discharge relationship discharge distribution friction factor

Syncytes during male meiosis resulting in 2n pollen grain formationin Lindelofia longiflora ***

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Journal of Systematics and Evolution 2011年第5期49卷 406-410页

作者： Vijay kumar SINGHAL Pawan kumar RANA Puneet kumar Department of Botany Punjabi University

Lindelofia longiflora(Royle ex Benth.) ***(Cl.) Brand(Family:Boraginaceae) is investigated cytologically(n = 12) for the first time from the cold deserts of Pangi Valley,Chamba District(Himachal Pradesh) in *** report the formation of syncytes and 2n pollen grains in the *** meiosis,the majority of the pollen mother cells(PMCs) exhibited 12 bivalents,equal segregation of chromosomes during anaphases,regular tetrads,and normal-sized pollen grain ***,two proximate PMCs fused during the early stages of prophase-I and resulted in the formation of *** frequency of syncytes in the accession is rather low,at 25 out of 1866(1.33%).Such syncyte PMCs are detectable during meiosis due to their larger size compared to typical *** syncytes or polyploid cells showed normal 24 bivalents and depicted perfectly regular meiotic *** the products of such PMCs yield 2n or larger sized pollen grains that are almost double the size of typical normal or n pollen *** origin of syncytes as a consequence of the fusion of meiocytes during the early stages of meiosis-I could be attributed to low temperature stress conditions prevailing in the Pangi Valley,where temperature during May and June dip to below freezing,the time the plants enters the reproductive/flowering bud *** is possible that such apparently fertile 2n pollen grains originating from syncytes might play a role in the origin of intraspecific polyploids in the species.

关键词： bivalents cold deserts low temperature stress Pangi Valley PMCs pollen grains.