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Evaluation of factors affecting the edge formability of two hot rolled multiphase steels

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International Journal of Minerals,Metallurgy and Materials 2018年第2期25卷 199-215页

作者： Monideepa mukherjee sumit Tiwari Basudev Bhattacharya Research and Development TATA STEELJamshedpur 831001India PSG College of Technology Coimbatore 641004India

In this study, the effect of various factors on the hole expansion ratio and hence on the edge formability of two hot rolled multiphase steels, one with a ferrite–martensite microstructure and the other with a ferrite-bainite microstructure, was investigated through systematic microstructural and mechanical characterization. The study revealed that the microstructure of the steels, which determines their strain hardening capacity and fracture resistance, is the principal factor controlling edge formability. The influence of other factors such as tensile strength, ductility, anisotropy, and thickness, though present, are secondary. A critical evaluation of the available empirical models for hole expansion ratio prediction is also presented.

关键词： stretch flanging hole expansion ratio martensite bainite edge formability multiphase steels

Adaptive Linear Quadratic Regulator for Continuous-Time Systems With Uncertain Dynamics

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IEEE/CAA Journal of Automatica Sinica 2020年第3期7卷 833-841页

作者： sumit Kumar Jha Shubhendu Bhasin IEEE Department of Electronics and Communication Engineering Motilal Nehru National Institute of Technology AllahabadPrayagraj-211004India Department of Electrical Engineering Indian Institute of Technology DelhiNew Delhi-110016India

In this paper, adaptive linear quadratic regulator(LQR) is proposed for continuous-time systems with uncertain dynamics. The dynamic state-feedback controller uses inputoutput data along the system trajectory to continuously adapt and converge to the optimal controller. The result differs from previous results in that the adaptive optimal controller is designed without the knowledge of the system dynamics and an initial stabilizing policy. Further, the controller is updated continuously using input-output data, as opposed to the commonly used switched/intermittent updates which can potentially lead to stability issues. An online state derivative estimator facilitates the design of a model-free controller. Gradient-based update laws are developed for online estimation of the optimal gain. Uniform exponential stability of the closed-loop system is established using the Lyapunov-based analysis, and a simulation example is provided to validate the theoretical contribution.

关键词： Adaptive optimal control continuous policy update linear quadratic regulator uncertain system dynamics

Multi-criteria decision based geospatial mapping of flood susceptibility and temporal hydro-geomorphic changes in the Subarnarekha basin, India

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Geoscience Frontiers 2021年第5期12卷 327-341页

作者： sumit Das Amitesh Gupta Department of Geography Savitribai Phule Pune UniversityPune 411007India Marine and Atmospheric Science Department Indian Institute of Remote Sensing(ISRO)DehradunIndia Department of Remote Sensing and GIS JIS UniversityKolkataIndia

The Subarnarekha River in east India experiences frequent high magnitude flooding in monsoon *** this study,we present an in-depth analysis of flood hydrology and GIS-based flood susceptibility mapping of the entire *** 40 years of annual peak discharge data,historical cross-sections of different gauging sites,and 12 flood conditioning factors were *** flood susceptibility mapping followed an expert knowledge-based multi-parametric analytical hierarchy process(AHP)and optimized AHP-VIP *** hydrology data indicated more than 5 times higher discharge contrasted with the mean streamflow of the peak monsoon month in all hydro-monitoring stations that correspond to possible overbank flooding in the shallow semi-alluvial reaches of the Subarnarekha *** ratio revealed continuous changes on the channel cross-sections at decadal scale in all gauging *** flood susceptibility map through optimized AHP-VIP method showed a great amount of areas(38%)have a high probability of flooding and demands earnest attention of administrative *** AHP-VIP based flood susceptibility map was theoritically validated through AUC approach and it showed fairly high accuracy(AUC=0.93).Our study offers an exceptionally cost and time effective solution to the flooding issues in the Subarnarekha basin.

关键词： Flood susceptibility AHP GIS Discharge Subarnarekha India

A comprehensive review and analysis of solar forecasting techniques

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Frontiers in Energy 2022年第2期16卷 187-223页

作者： Pardeep SINGLA Manoj DUHAN sumit SAROHA Department of ECE Deenbandhu Chhotu Ram University of Science and TechnologyMurthalSonepat 131039India Department of Printing Technology(Electrical Engineering) Guru Jambheshwar University of Science and TechnologyHisar 125001India

In the last two decades,renewable energy has been paid immeasurable attention to toward the attainment of electricity requirements for domestic,industrial,and agriculture *** forecasting plays a vital role in smooth operation,scheduling,and balancing of electricity production by standalone PV plants as well as grid interconnected solar PV *** models and techniques have been developed in short,mid and long-term solar *** paper analyzes some of the potential solar forecasting models based on various methodologies discussed in literature,by mainly focusing on investigating the influence of meteorological variables,time horizon,climatic zone,pre-processing techniques,air pollution,and sample size on the complexity and accuracy of the *** make the paper reader-friendly,it presents all-important parameters and findings of the models revealed from different studies in a tabular mode having the year of publication,time resolution,input parameters,forecasted parameters,error metrics,and *** literature studied showed that ANN-based models outperform the others due to their nonlinear complex problem-solving *** accuracy can be further improved by hybridization of the two models or by performing pre-processing on the input ***,it also discusses the diverse key constituents that affect the accuracy of a *** has been observed that the proper selection of training and testing period along with the correlated dependent variables also enhances the accuracy of the model.

关键词： forecasting techniques hybrid models neural network solar forecasting error metric support vector machine(SVM)

THE GENERALIZED HYPERSTABILITY OF GENERAL LINEAR EQUATION IN QUASI-2-BANACH SPACE

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Acta Mathematica Scientia 2022年第4期42卷 1357-1372页

作者： Ravinder Kumar SHARMA sumit CHANDOK School of Mathematics Thapar Institute of Engineering and TechnologyPatiala-147004India

In this paper,we study the hyperstability for the general linear equation f(ax+by)=Af(x)+Bf(y)in the setting of complete quasi-2-Banach *** first extend the main fixed point result of Brzdek and Ciepliński(Acta Mathematica Scientia,2018,38 B(2):377-390)to quasi-2-Banach spaces by defining an equivalent quasi-2-Banach *** we use this result to generalize the main results on the hyperstability for the general linear equation in quasi-2-Banach *** results improve and generalize many results of literature.

关键词： Hyperstability quasi-2-Banach spaces fixed point general linear equation

Strain-induced fast domain wall motion in hybrid piezoelectric-magnetostrictive structures with Rashba and nonlinear dissipative effects

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Acta Mechanica Sinica 2024年第9期40卷 83-97页

作者： sumit Maity Sarabindu Dolui Sharad Dwivedi Department of Mathematics School of SciencesNational Institute of Technology Andhra PradeshTadepalligudem 534101India

The prime objective of this work is to analyze the motion of magnetic domain walls(DWs)in a thin layer of magnetostrictive material that is perfectly attached to the upper surface of a thick piezoelectric *** our analysis,we consider a transversely isotropic hexagonal subclass of magnetostrictive materials that demonstrate structural inversion *** this aim,we utilize the one-dimensional extended Landau-Lifshitz-Gilbert equations,which describe the magnetization dynamics under the influence of various factors such as magnetic fields,spin-polarized electric currents,magnetoelastic effects,magnetocrystalline anisotropy,Rashba fields,and nonlinear dry-friction *** employing the standard traveling wave ansatz,we derive an analytical expression of the most relevant dynamic features:velocity,mobility,threshold,breakdown,and propagation direction of the DWs in both steady and precessional dynamic *** analytical investigation provides insights into how effectively the considered parameters can control the DW ***,numerical illustrations of the obtained analytical results show a qualitative agreement with the recent observations.

关键词： Domain wall Magnetoelastic field Extended Landau-Lifshitz-Gilbert equation Dry-friction dissipation Rashba effect

Use of waste plastic oil as a fuel in reactivity-controlled compression ignition engines:a bibliometric investigation from 2017-23

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Clean Energy 2024年第3期8卷 206-222页

作者： sumit Kanchan Sarbjot Singh Sandhu Department of Mechanical Engineering Dr B R Ambedkar National Institute of TechnologyJalandharPunjabIndia School of Mechanical Engineering Lovely Professional UniversityJalandharPunjabIndia

Waste plastic oil,generated through the pyrolysis of plastic without oxygen,known as plastic-to-fuel conversion,stands as a promising alternative *** research employs bibliometric analysis,a quantitative method,to comprehensively assess publications in the domain of waste plastic oil integration within reactivity-controlled compression ignition *** Scopus as the primary repository post-2017,the study categorizes information into pivotal aspects,including influential journals,countries,authors,affiliations,document types,thematic areas,sponsors and *** analysis reveals significant contributions from diverse nations,prominently India,China,Turkey and *** is the prevalence of Energy,Engineering and Chemical Engineering as thematic focal points,with the journal Fuel leading the count followed by the journal Energy emerging as a prominent *** contributions are prolific,led by Gandhi Institute of Technology and Management University and Vellore Institute of *** authors‘Gugulothu S.K’and‘He Z’play a pivotal role in shaping the *** National Natural Science Foundation of China stands out as a primary *** bibliometric analysis provides a structured understanding of waste plastic oil integration in reactivity-controlled compression ignition engines,laying the groundwork for future research *** study identifies potential research platforms beyond Scopus,including Web of Science,CrossRef,Science Direct and Google Scholar,as valuable repositories for further ***,after careful observation of the research articles published by the top 10 authors as found in the study,it was found that the authors share a few common characteristics that helped them in advancing the understanding and application of waste plastic oil in reactivity-controlled compression ignition *** are also summarized in the present study with supporting data.

关键词： bibliometric analysis plastic-to-fuel waste plastic oil RCCI engine Scopus database

Mechanical properties and thermal conductivity of pristine and functionalized carbon nanotube reinforced metallic glass composites:A molecular dynamics approach

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Defence Technology（防务技术） 2021年第1期17卷 234-244页

作者： sumit Sharma S.K.Tiwari Sagar Shakya Department of Mechanical Engineering Dr.B.R.Ambedkar National Institute of TechnologyJalandharIndia

This work uses the molecular dynamics approach to study the effects of functionalization of carbon nanotubes(CNTs)on the mechanical properties of Cu64Zr36 metallic glass(MG).Three types of functional groups,carboxylic,vinyl and ester were *** effect of CNT volume fraction(Vf)and the number of functional groups attached to CNT,on the mechanical properties and thermal conductivity of CNT-MG composites was analysed using Biovia Materials *** lower values of Vf(from 0 to 5%),the percentage increase in Young’s modulus was approximately 66%.As the value of Vf was increased further(from 5 to 12%),the rate of increase in Young’s modulus was reduced to 16%.The thermal conductivity was found to increase from 1.52 W/mK at Vf?0%to 5.88 W/mK at Vf?12%,thus giving an increase of approximately 286%.Functionalization of SWCNT reduced the thermal conductivity of the SWCNT-MG composites.

关键词： Molecular dynamics Carbon nanotube Metallic glass Mechanical properties Thermal conductivity

SARS-CoV-2 spike protein-ACE2 interaction increases carbohydrate sulfotransferases and reduces N-acetylgalactosamine-4-sulfatase by p38 MAPK

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Signal Transduction and Targeted Therapy 2024年第3期9卷 1174-1185页

作者： sumit Bhattacharyya Joanne K.Tobacman Jesse Brown VA Medical Center and University of Illinois at Chicago ChicagoIL 60612USA

Immunostaining in lungs of patients who died with CovID-19 infection showed increased intensity and distribution of chondroitin sulfate and decline in N-acetylgalactostamine-4-sulfatase(Arylsulfatase B;ARSB).To explain these findings,human small airway epithelial cells were exposed to the SARS-CoV-2 spike protein receptor binding domain(SPRBD)and transcriptional mechanisms were ***-p38 MAPK and phospho-SMAD3 increased following exposure to the SPRBD,and their inhibition suppressed the promoter activation of the carbohydrate sulfotransferases CHST15 and CHST11,which contributed to chondroitin sulfate *** in ARSB was mediated by phospho-38 MAPK-induced N-terminal Rb phosphorylation and an associated increase in Rb-E2F1 binding and decline in E2F1 binding to the ARSB *** increases in chondroitin sulfotransferases were inhibited when treated with phospho-p38-MAPK inhibitors,SMAD3(SIS3)inhibitors,as well as antihistamine desloratadine and antibiotic *** the mouse model of carrageenan-induced systemic inflammation,increases in phosphop38 MAPK and expression of CHST15 and CHST11 and declines in DNA-E2F binding and ARSB expression occurred in the lung,similar to theobserved effects in this SPRBD model of COVID-19 *** accumulation of chondroitin sulfates is associated with fibrotic lung conditions and diffuse alveolar damage,increased attention to p38-MAPK inhibition may be beneficial in amelioratingCovid-19infections.

关键词： ACE2 lung inhibited