检索结果-南通市图书馆

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

Storage technologies for electric vehicles

在线全文

学校读者我要写书评

暂无评论

Journal of Traffic and Transportation Engineering(English Edition) 2020年第3期7卷 340-361页

作者： Snigdha sharma Amrish KPanwar MMTripathi Department of Electrical Engineering Delh Technological UniversityNew Delhi 110042India Department of Applied Physics Delhi Technological UniversityNew Delhi 110042India

This review article describes the basic concepts of electric vehicles(EVs)and explains the developments made from ancient times to till date leading to performance improvement of the electric *** also presents the thorough review of various components and energy storage system(ESS)used in electric *** main focus of the paper is on batteries as it is the key component in making electric vehicles more environment-friendly,cost-effective and drives the EVs into use in day to day *** ESS topologies including hybrid combination technologies such as hybrid electric vehicle(HEV),plug-in HEV(PHEV)and many more have been *** technologies are based on different combinations of energy storage systems such as batteries,ultracapacitors and fuel *** hybrid combination may be the perspective technologies to support the growth of EVs in modern *** advanced charging systems may also play a major role in the roll-out of electric vehicles in the *** general strategies of advanced charging systems are explained to highlight the importance of fast charging time with high amount of power and its cost-effectiveness for electric ***,the battery pack designing calculation is briefly explained along with all mechanical,electrical and environmental battery tests,which helps in the evaluation of ***,this paper also has a brief summarizing with the help of a flow chart,which clearly demonstrates all the parts of electric vehicles in a much simpler way.

关键词： Electric vehicle(EV) Battery electric vehicle(BEV) Hybrid electric vehicle(HEV) Battery

An arrow in the quiver: evaluating the performance of Hyptis suaveolens(L.) Poit. in different light levels

在线全文

学校读者我要写书评

暂无评论

Ecological Processes 2024年第2期13卷 130-147页

作者： Kanhaiya Shah Gyan Prakash sharma R.Sagar Department of Environmental Studies University of Delhi Department of Botany Banaras Hindu University

Background Hyptis suaveolens（L.） Poit.,native to the American tropics,is a pantropical annual plant and a major invasive species throughout *** was anticipated that the availability of sunlight,coupled with its superior reproductive potential,persistent propagule bank,and dispersal ability,could lead to an increase in the growth and spread of this invader,thus potentially impeding herbaceous growth and diversity in non-native *** its ecological fitness and competitive performance will be useful to manage the spread of *** in natural ecosystems that are facing a wide range of anthropogenic *** The present study is a three-tier *** the first tier,a field study was conducted to assess the patterns of *** abundance and herbaceous species diversity in response to light availability(sun,842-1072μmol m-2s-1and shade 253-341 μmol m-2S-1) in the tropical dry deciduous ecosystems in the Vindhyan highlands,***,the impact of *** abundance on the resident native and non-native species abundance and diversity was also *** the second tier,a randomized common garden experiment was conducted to understand the trait fitness of *** in sun(940 μmol m-2s-1) and shade(300 μmol m-2s-1) *** the third tier,a plant growth chamber experiment with high-light(940 μmol m-2s-1) and low-light(300 μmol m-2s-1)treatments was done to learn how *** partitions its biomass between aboveground and belowground plant *** The field study indicated that the sunlit areas had a higher abundance of *** and a lower diversity of resident herbaceous species than the shaded *** common garden experiment showed that sun-dwelling *** individuals performed better in germinative,vegetative,eco-physiological,and reproductive traits than the shade-dwelling *** growth chamber experiment exhibited that plants grown in high-light environment had greater seed germi

关键词： Invasive species Native species Species diversity Life-history trait Oskar syndrome Plasticity index

Administration of Fenugreek Seed Extract Produces Better Effects in Glibenclamide-Induced Inhibition in Hepatic Lipid Peroxidation: An in vitro Study

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2019年第4期25卷 278-284页

作者： sharma Neha Kar Anand Panda Sunanda School of Life Sciences Devi Ahilya UniversityTakshashila CampusIndore452017India

Objective: To evaluate the comparative effects of fenugreek(Trigonel a foenum graecum) seed extract(FSE) alone and in combination with an antidiabetic conventional medicine,glibenclamide(GLB),on the inhibition of in vitro lipid peroxidation(LPO) in liver,the major target organ of a ***: LPO was induced by ferrous sulphate(Fe So4),hydrogen peroxide(H2 O2) and carbon tetrachloride(CCl4) and the effects of test seed extract and/or GLB were ***: While Fe So4,H2 O2 and CCl4 markedly enhanced the hepatic LPO,simultaneous administration of FSE reduced it in a concentration dependent ***,when both FSE and GLB were added to the incubation mixture,chemical y induced hepatic LPO was further *** test extract also exhibited high antioxidative activity in 1,1-diphenyl-2-picrylhydrazyl radical and in 2,2'-azino-bis,3-ethylbenzothiazoline-6-sulphonic acid radical scavenging ***: FSE therapy in moderate concentration along with a hypoglycemic drug may prove to be advantageous in ameliorating diabetes mel itus and other diseases that are LPO mediated.

关键词： fenugreek glibenclamide antioxidant activity lipid peroxidation

A new lignan rhamnoside from Bauhinia retusa seed pods(Caesalpiniaceae)

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2011年第9期22卷 1081-1083页

作者： Sushma Semwal Rajni Kant sharma Department of Chemistry HNB Garhwal Central University SrinagarUttarakhandIndia Department of Chemistry University of Cape TownCape TownRondebosch 7701South Africa

A new lignan rhamnoside identified as 2,6-di（4＇,5＇-dihydroxyphenyl）-3,7-dioxabicyclo[3.3.0]octane-1-hydroxy-5-O-rhamnopyranoside （1） has been isolated from the ethanolic extract of seed pods of Bauhinia retusa. ... 详细信息

关键词： Bauhinia retusa Caesalpiniaceae Lignan rhamnoside

Rock-like behavior of biocemented sand treated under non-sterile environment and various treatment conditions

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2021年第3期13卷 705-716页

作者： Meghna sharma Neelima Satyam Krishna RReddy Discipline of Civil Engineering Indian Institute of Technology IndoreIndore453552India Department of Civil Materialsand Environmental EngineeringUniversity of Illinois at ChicagoChicagoILUSA

Microbially induced calcite precipitation(MICP)is a recently developed technique for microbiological ground improvement that has been applied for mitigating various geotechnical ***,the major challenges,such as calcite precipitation uniformity,presence of different bacteria,cementation solution optimization for cost reduction,and implementation under non-sterile and uncontrolled field environment are still not fully explored and require detailed investigation before field *** study aims to address these challenges of MICP to improve the geotechnical properties of sandy *** series of experiments were conducted using poorly graded Narmada River(India)sand,which were subjected to various biotreatment schemes and tested for unconfined compressive strength(UCS),split tensile strength(STS),ultrasonic pulse velocity(UPV),hydraulic conductivity(after 6 d,12 d,and 18 d of treatment),and calcite *** microstructure of sand was examined through a scanning electron microscope(SEM).Initially,the sand was individually augmented with two non-pathogenic bacterial strains,***(S.)pasteurii and Bacillus(B.)*** stopped-flow injection method was adopted to provide cementation solutions at three different durations(treatment cycle)of 12 h,24 h,and 48 h and three different pore volumes(PVs)of 1,0.75,and *** pore volume here refers to the porosity which is expressed as a ratio,i.e.a porosity of 50%was used as *** results showed rock-like behaviors of biocemented sand with the UCS,STS,and UPV enhancement up to 2333 kPa,437 kPa,and 2670 m/s,*** hydraulic conductivity reduction of 96.6%was achieved by 12%of calcite formation after 18 d of treatment using Sporosarcina pasteurii,12-h treatment cycle,and one pore volume of cementation media in each ***,a 24-h treatment cycle and 0.5-pore volume cementation solution were found to be the optimal treatment which was effective and economical to achiev

关键词： Bacteria Microbially induced calcite precipitation (MICP) Soil stabilization Microstructure Calcite content

Gallbladder cancer epidemiology, pathogenesis and molecular genetics: Recent update

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2017年第22期23卷 3978-3998页

作者： Aarti sharma Kiran Lata sharma Annapurna Gupta Alka Yadav Ashok Kumar Department of Surgical Gastroenterology Sanjay Gandhi Post Graduate Institute of Medical Sciences Department of Biochemistry and Medical Genetics John Buhler Research Centre University of Manitoba

Gallbladder cancer is a malignancy of biliary tract which is infrequent in developed countries but common in some specific geographical regions of developing countries. Late diagnosis and deprived prognosis are major problems for treatment of gallbladder carcinoma. The dramatic associations of this orphan cancer with various genetic and environmental factors are responsible for its poorly defined pathogenesis. An understanding to the relationship between epidemiology, molecular genetics and pathogenesis of gallbladder cancer can add new insights to its undetermined pathophysiology. Present review article provides a recent update regarding epidemiology, pathogenesis, and molecular genetics of gallbladder cancer. We systematically reviewed published literature on gallbladder cancer from online search engine Pub Med(http://***/pubmed). Various keywords used for retrieval of articles were Gallbladder, cancer Epidemiology, molecular genetics and bullion operators like AND, OR, NOT. Cross references were manually searched from various online search engines(http://***/pubmed,https://***/, http://***/***). Most of the articles published from 1982 to 2015 in peer reviewed journals have been included in this review.

关键词： Gallbladder cancer Epidemiology Molecular genetics Pathogenesis

A Wavelet Neural Network Based Non-linear Model Predictive Controller for a Multi-variable Coupled Tank System

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2015年第2期12卷 156-170页

作者： Kayode Owa Sanjay sharma Robert Sutton School of Marine Science and Engineering University of Plymouth Marine and Industrial Dynamic Analysis (MIDAS) Research Group University of Plymouth

In this paper, a novel real time non-linear model predictive controller(NMPC) for a multi-variable coupled tank system(CTS) is designed. CTSs are highly non-linear and can be found in many industrial process applications. The involvement of multi-input multi-output(MIMO) system makes the design of an effective controller a challenging task. MIMO systems have inherent couplings,interactions in-between the process input-output variables and generally have an complex internal structure. The aim of this paper is to design, simulate, and implement a novel real time constrained NMPC for a multi-variable CTS with the aid of intelligent system techniques. There are two major formidable challenges hindering the success of the implementation of a NMPC strategy in the MIMO case. The first is the difficulty of obtaining a good non-linear model by training a non-convex complex network to avoid being trapped in a local minimum solution. The second is the online real time optimisation(RTO) of the manipulated variable at every sampling time.A novel wavelet neural network(WNN) with high predicting precision and time-frequency localisation characteristic was selected for an MIMO model and a fast stochastic wavelet gradient algorithm was used for initial training of the network. Furthermore, a genetic algorithm was used to obtain the optimised parameters of the WNN as well as the RTO during the NMPC strategy. The proposed strategy performed well in both simulation and real time on an MIMO CTS. The results indicated that WNN provided better trajectory regulation with less mean-squared-error and average control energy compared to an artificial neural network. It is also shown that the WNN is more robust during abnormal operating conditions.

关键词： Wavelet neural network(WNN) non-linear model predictive control(NMPC) real time practical implementation multi-input multi-outpu

Universal converse flexoelectricity in dielectric materials via varying electric field direction

在线全文

学校读者我要写书评

暂无评论

International Journal of Smart and Nano Materials 2021年第1期12卷 107-128页

作者： Saurav sharma Rajeev Kumar Rahul Vaish School of Engineering Indian Institute of Technology MandiMandiIndia

Flexoelectricity is a symmetry independent electromechanical cou-pling phenomenon that outperforms piezoelectricity at micro and nanoscales due to its size-dependent behavior arising from gradi-ent terms in its constitutive ***,due to this gradient term flexoelectricity,to exhibit itself,requires specially designed geometry or material composition of the dielectric *** of its kind,the present study put forward a novel strategy of achieving electric field gradient and thereby converse flexoelectri-city,independent of geometry and material composition of the *** spatial variation of the electric field is established inside the dielectric material,Ba_(0.67)Sr_(0.33)TiO_(3)(BST),by manipulating electrical boundary *** unique patterns of electrode placement are suggested to achieve this spatial *** varying direction of electric field gives rise to electric field gradient,the prerequisite of converse flexoelectricity.A multi-physics cou-pling based theoretical framework is established to solve the flexo-electric actuation by employing isogeometric analysis(IGA).Electromechanically coupled equations of flexoelectricity are solved to obtain the electric field distribution and the resulting displace-ments *** maximum displacements of 0.2 nm and 2.36 nm are obtained with patterns I and II,respectively,while pattern III can yield up to 85 nm of maximum displacement.

关键词： Converse flexoelectricity electrical boundary conditions electric field direction isogeometric analysis

Rare earth(La)and metal ion(Pb)substitution induced structural and multiferroic properties of bismuth ferrite

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2015年第4期4卷 292-299页

作者： Poorva sharma Ashwini KUMAR Dinesh VARSHNEY Materials Science Laboratory School of PhysicsVigyan BhawanDevi Ahilya UniversityKhandwa Road CampusIndore 452001India Department of Physics Southeast UniversityJiangning DistrictNanjing 211189China

In this study,bulk samples of multiferroic with compositional formula,BiFeO3 and Bi_(0.825)A_(0.175)FeO_(3)(A=La,Pb),were synthesized by solid state reaction route.X-ray diffraction(XRD)along with the Rietveld refinement revealed the distorted rhombohedral(R3c)structure for pristine BiFeO3 and Bi0.825La0.175FeO3 and tetragonal(P4/mmm)for Bi_(0.825)Pb_(0.175)FeO_(3)*** support the structural results,bond length between atoms for both of the compounds was calculated.A change in Raman mode position in BiFeO3(BFO)has been observed with La and Pb substitution from Raman scattering measurements and also recommended a structural change with rare earth and metal ion substitution at Bi *** the frequency dependent dielectric constant and dielectric loss plots,a decrease in dielectric values with increase in frequency was observed for both of the *** microelectronic devices,porous ceramics with lower value of dielectric constant are most ***,further studies are also needed to carefully tune the magnetoelectric properties and structural distortion after La/Pb substitution in BFO.

关键词： ceramics X-ray diffraction(XRD) Raman spectroscopy dielectric properties