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Thermo-mechanical and tribological properties of SU-8/h-BN composite with SN150/perfluoropolyether filler

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Friction 2020年第1期8卷 151-163页

作者： Anand singh RATHAUR Jitendra k.ATIYAR vinay k.mar PATEL Department of Mechanical Engineering Govind Ballabh Pant Institute of Engineering and Technology GhurdauriPauri GarhwalUttarakhand 246194India Department of Mechanical Engineering SRM Institute of Science and TechnologyKattankulathur CampusChennaiTamil Nadu 603203India

In this study, SU-8 and its composites are fabricated by blending 10 wt.% hexagonal boron nitride(h-BN) fillers with/without lubricants, such as 10 wt.% base oil(SN150) and 20 wt.% perfluoropolyether(PFPE). The thick.ess of SU-8 and its composites coating is fabricated in the range ~100–105 μm. Further, SU-8 and its composites are characterized by a 3D optical profilometer, atomic force microscopy, scanning electron microscopy, a thermal gravimetric analyzer, a goniometer, a hardness tester, and an optical microscope. Under a tribology test performed at different normal loads of 2, 4, and 6 N and at a constant sliding speed of 0.28 m/s, the reduction in the initial and steady-state coefficient of friction is obtained to be ~0.08 and ~0.098, respectively, in comparison to SU-8(~0.42 and ~0.75), and the wear resistance is enhanced by more than 103 times that of pure SU-8. Moreover, the thermal stability is improved by ~80–120 ℃, and the hardness and elastic modulus by ~3 and ~2 times that of pure SU-8, respectively. The SU-8 composite reinforced with 10 wt.% h-BN and 20 wt.% PFPE demonstrated the best thermo-mechanical and tribological properties with a nano-textured surface of high hydrophobicity.

关键词： SU‐8 boron nitride perfluoropolyether(PFPE) base oil(SN 150) in‐situ lubrication

A Holistic,Proactive and Novel Approach for Pre,During and Post Migration Validation from Subversion to Git

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Computers, Materials & Continua 2021年第3期66卷 2359-2371页

作者： vinay singh Mohammed Alshehri Alok.Aggarwal Osama Alfarraj Purushottam Sharma k.R.Pardasani School of Computer Science University of Petroleum&Energy StudiesDehradunIndia Department of Information Technology College of Computer and Information SciencesMajmaah UniversityMajmaah11952Saudi Arabia Computer Science Department Community CollegeKing Saud UniversityRiyadhSaudi Arabia Amity School of Engineering&Technology Amity UniversityUttar PradeshNoidaIndia Department of Mathematics Bioinformatics&Computer ApplicationsMaulana Azad National Institute of TechnologyBhopal462003India

Software development is getting a transition from centralized version control systems(CVCSs)lik. Subversion to decentralized version control systems(DVCDs)lik. Git due to lesser efficiency of former in terms of branching,fusion,time,space,merging,offline commits&builds and repository,*** is having a share of 77%of total VCS,followed by Subversion with a share of 13.5%.The majority of software industries are getting a migration from Subversion to *** a few migration tools are available in the software ***,these too lack.in many features lik. lack.of identifying the empty directories as premigration check.failover capabilities during migration due to network.failure or disk.space issue,and detailed report generation as post-migration *** this work.a holistic,proactive and novel approach has been presented for pre/during/post-migration validation from Subversion to *** scripts have been developed and executed run-time over various projects for overcoming the limitations of existing migration software tools for a Subversion to Git *** premigration,none of the available migration tools has the capability to fetch empty directories of Subversion,which results in an incomplete migration from Subversion to *** Scripts have been developed and executed for pre-migration validation and migration preparation,which overcomes the problem of incomplete *** was conducted in SRLC Software Research Lab,Chicago,*** the migration process,in case of loss of network.connection or due to any other reason,if migration stops or break.,available migration tools do not have capabilities to start over from the same point where it *** Scripts have been developed and executed to k.ep the migration revision history in the cache(elastic cache)to start from the same point where it was left due to connection *** post-migration,none of the available version control migration tools generate a detailed repo

关键词： Databases and information systems subversion Git version control system trunk tag translational settings author mapping

ON APPROXIMATE EFFICIENCY FOR NONSMOOTH ROBUST VECTOR OPTIMIZATION PROBLEMS

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Acta Mathematica Scientia 2020年第3期40卷 887-902页

作者： Tadeusz ANTCZAk.Yogendra PANDEY vinay singh Shashi k.nt MISHRA Faculty of Mathematics and Computer Science University of LódźBanacha 2290-238 LódźPoland Department of Mathematics Satish Chandra CollegeBallia 277001India Department of Mathematics National Institute of TechnologyAizawl-796012MizoramIndia Department of Mathematics Banaras Hindu UniversityVaranasi-221005India

In this article,we use the robust optimization approach(also called the worst-case approach)for findingε-efficient solutions of the robust multiobjective optimization problem defined as a robust(worst-case)counterpart for the considered nonsmooth multiobjective programming problem with the uncertainty in both the objective and constraint ***,we establish both necessary and sufficient optimality conditions for a feasible solution to be anε-efficient solution(an approximate efficient solution)of the considered robust multiobjective optimization *** also use a scalarizing method in proving these optimality conditions.

关键词： Robust optimization approach robust multiobjective optimization ε-efficient solution ε-optimality conditions scalarization

An analysis of energy consumption and carbon footprints of cryptocurrencies and possible solutions

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Digital Communications and Network. 2023年第1期9卷 79-89页

作者： Varun k.hli Sombuddha Chak.avarty vinay Chamola k.ldip singh Sangwan Sherali Zeadally Department of Electrical and Computer Engineering Engineering National University of SingaporeSingapore Department of Electrical and Electronics Engineering&APPCAIR BITS-PilaniPilani Campus333031India Department of Mechanical Engineering BITS-PilaniPilani Campus333031India College of Communication and Information University of KentuckyLexingtonKY40506-0224USA

There is an urgent need to control global warming caused by humans to achieve a sustainable ***_(2) levels are rising steadily,and while countries worldwide are actively moving toward the sustainability goals proposed during the Paris Agreement in 2015,we are still a long way to go from achieving a sustainable mode of global *** increased popularity of cryptocurrencies since the introduction of Bitcoin in 2009 has been accompanied by an increasing trend in greenhouse gas emissions and high electrical energy *** energy track.ng studies(e.g.,Digiconomist and the Cambridge Bitcoin Energy Consumption Index(CBECI))have estimated energy consumption ranges from 29.96 TWh to 135.12 TWh and 26.41 TWh to 176.98 TWh,respectively for Bitcoin as of July 2021,which are equivalent to the energy consumption of countries such as Sweden and *** latest estimate by Digiconomist on carbon footprints shows a 64.18 MtCO_(2) emission by Bitcoin as of July 2021,close to the emissions by Greece and *** review compiles estimates made by various studies from 2018 to *** compare the energy consumption and carbon footprints of these cryptocurrencies with countries around the world and centralized transaction methods such as *** identify the problems associated with cryptocurrencies and propose solutions that can help reduce their energy consumption and carbon ***,we present case studies on cryptocurrency network.,namely,Ethereum 2.0 and Pi Network.with a discussion on how they can solve some of the challenges we have identified.

关键词： Block.hain Carbon footprint Climate change Cryptocurrency Sustainability

Genome recoding strategies to improve cellular properties: mechanisms and advances

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aBIOTECH 2021年第1期2卷 79-95页

作者： Tanya singh Sudesh k.mar Yadav Alexander Vainstein vinay k.mar Department of Botany School of Basic SciencesCentral University of PunjabBathinda 151001India Center of Innovative and Applied Biotechnology Mohali 140306India Institute of Plant Sciences and Genetics in Agriculture The Hebrew University of JerusalemRehovotIsrael

The genetic code,once believed to be universal and immutable,is now k.own to contain many variations and is not quite *** basis for genome recoding strategy is genetic code variation that can be harnessed to improve cellular ***,genome recoding is a promising strategy for the enhancement of genome flexibility,allowing for novel functions that are not commonly documented in the organism in its natural ***,the basic concept of genetic code and associated mechanisms for the generation of genetic codon variants,including biased codon usage,codon reassignment,and ambiguous decoding,are extensively *** of the concept of natural genetic code expansion is also *** generation of recoded organisms and associated mechanisms with basic targeting components,including aminoacyl-tRNA synthetase–tRNA pairs,elongation factor EF-Tu and ribosomes,are highlighted for a comprehensive understanding of this *** research associated with the generation of diverse recoded organisms is also *** success of genome recoding in diverse multicellular organisms offers a platform for expanding protein chemistry at the biochemical level with non-canonical amino acids,genetically isolating the synthetic organisms from the natural ones,and fighting viruses,including SARS-CoV2,through the creation of attenuated *** conclusion,genome recoding can offer diverse applications for improving cellular properties in the genome-recoded organisms.

关键词： Genetic code Codon usage Protein engineering Attenuated virus

Anterior resection for rectal carcinoma-risk.factors for anastomotic leak. and strictures

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World Journal of Gastroenterology 2011年第11期17卷 1475-1479页

作者： Ashok.k.mar Ram Daga Paari Vijayaragavan Anand Prak.sh Rajneesh k.mar singh Anu Behari vinay k.k.poor Rajan Saxena Department of Surgical Gastroenterology Sanjay Gandhi Post Graduate Institute of Medical Sciences Lucknow 226014India

AIM:To determine the incidence and factors responsible for anastomotic leak. and stricture following anterior resection(AR)and its subsequent ***:Retrospective analysis of data from 108 patients with rectal carcinoma who underwent AR or low anterior resection(LAR)to identify the various preoperative,operative,and post operative factors that might have influence on anastomotic leak. and ***:There were 68 males and 40 females with an average of 47 years(range 21-75 years).The median distance of the tumor from the anal verge was 8 cm(range 3-15 cm).Sixty(55.6%)patients underwent handsewn anastomosis and 48(44.4%)were *** median operating time was 3.5 h(range2.0-7.5 h).Sixteen(14.6%)patients had an anastomotic *** these,11 patients required reexploration and five were managed *** anastomotic leak.rate was similar in patients with and without diverting stoma(8/60,13.4%with stoma and 8/48;16.7%without stoma).In 15(13.9%)patients,resection margins were positive for ***(17.6%)patients developed anastomotic strictures at a median duration of 8 mo(range 3-20 mo).Among these,15 patients were successfully managed with per-anal *** multivariate analysis,advance age(>60 years)was the only risk.factor for anastomotic leak.P=0.004).On the other hand,anastomotic leak.P=0.00),mucin positive tumor(P =0.021),and lower rectal growth(P=0.011)were found as risk.factors for the development of an anastomotic ***:Advance age is a risk.factor for an anastomotic *** anastomotic leak.a mucin-secreting tumor,and lower rectal growth predispose patients to develop anastomotic strictures.

关键词： Rectal carcinoma Anterior resection Anastomotic leak Stricture

System Identification of Heritage Structures Through AVT and OMA:A Review

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Structural Durability & Health Monitoring 2019年第1期13卷 1-40页

作者： vinay Shimpi Madappa V.R.Sivasubramanian S.B.singh Department of Civil Engineering National Institute of Technology PuducherryKaraikal609609India Department of Civil Engineering Birla Institute of Technology and Science PilaniPilani333031India

In this review article,the past investigations carried out on heritage structures using Ambient Vibration Test(AVT)and Operational Modal Analysis(OMA)for system identification(determination of dynamic properties lik. frequency,mode shape and damping ratios)and associated applications are summarized.A total of 68 major research studies on heritage structures around the world that are available in literature are surveyed for this *** first,field investigations carried out on heritage structures prior to conducting AVT are explained in ***,specifications of accelerometers,location of accelerometers and optimization of accelerometer network. have been elaborated with respect to the geometry of the heritage *** addition to this,ambient vibration loads and data acquisition procedures are also ***,the state of art of performing OMA techniques for heritage structures is explained ***,various applications of system identification for heritage structures are ***,conclusions are made towards errorless system identification of heritage structures through AVT and OMA.

关键词： Ambient Vibration Test(AVT) heritage structures Operational Modal Analysis(OMA) structural assessment system identification

Role of MgF2 addition on high energy ball milled k.lsilite:Implementation as dental porcelain with low temperature frit

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Journal of Advanced Ceramics 2014年第4期3卷 332-338页

作者： Pattem Hemanth k.MAR Abhinav SRIVASTAVA Vijay k.MAR Nandini JAISWAL Pradeep k.MAR vinay k.mar singh Department of Ceramic Engineering Indian Institute of Technology(BHU)VaranasiIndia Department of Chemical Engineering Indian Institute of Technology(BHU)VaranasiIndia

Porcelain fused to metal(PFM)has received great attention over the last few years due to its importance in the ***(k.(2)O·Al_(2)O_(3)·SiO_(2))is a high thermal expansion porcelain,suitable for bonding to ***,k.lsilite is a metastable phase which gets converted into crystalline leucite upon *** the current work.feasibility of developing stable k.lsilite phase,dispersion of MgF2 in it as an additive and using mechanochemical synthesis are *** fine dental material has been formulated by mixing prepared k.lsilite with low temperature frit(LTF)in different *** crystalline phases evolved in fired powders are characterized by powder X-ray diffraction(XRD)*** with different ratio of LTF has been cold pressed and heat treated to examine its coefficient of thermal expansion(CTE),flexural strength,apparent porosity(AP),bulk.density(BD)and *** indicate that MgF_(2) addition and high milling duration help in k.lsilite *** also plays an important role in this stabilization,and at 1100℃single phase k.lsilite formation is *** outcomes demonstrate that it is easily possible to synthesize a stable single phase k.lsilite with desirable properties.

关键词： k.lsilite porcelain fused to metal(PFM) dental ceramic mechanochemical synthesis thermal expansion X-ray diffraction(XRD)

Analysis of groundwater level trend in Jak.am River Basin of Southern Rajasthan

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Journal of Groundwater Science and Engineering 2022年第1期10卷 1-9页

作者： vinay k.mar Gautam Mahesh k.thari P.k.singh S.R.Bhak.r k.k.Yadav Department of Soil and Water Engineering CTAEMPUATUdaipur-313001(Raj.)India

Groundwater accounts for about half of the water use for irrigation in *** fluctuation pattern of the groundwater level is examined by observing rainfall replenishment and monitoring *** southern part of Rajasthan has experienced abrupt changes in rainfall and has been highly dependent on groundwater over *** study presents the impact of over-dependence on groundwater usage for irrigation and other purposes,spatially and ***,the objective of this study is to examine the groundwater level trend by using statistical analysis and geospatial *** factor was also studied in groundwater level fluctuation during *** analyze the influence of each well during recharge or withdrawal of groundwater,thiessien polygonswere generated from *** the Jak.am River basin,75 wells have been identified for water level trend study using the Mann-k.ndall statistical *** statistics of trend analysis show that 15%wells are experiencing water level decline in pre-monsoon,while very low percentage of wells have such trend during post-monsoon *** average rate of water level decline is 0.245 m/a in pre-monsoon and 0.05 m/a in *** aquifer recharge potential is also decreasing by *** is expected that such type of studies will help the policy mak.rs to adopt advanced management practices to ensure sustainable groundwater resource management.

关键词： Groundwater Trend analysis Rainfall k.ndal tau Slope p value Recharge Pre-and postmonsoon