检索结果-南通市图书馆

Performance characterization of Bi_2O_3/Al nanoenergetics blasted micro-forming system

Defence Technology（防务技术） 2019年第1期15卷 98-105页

作者： Vinay Kumar Patel Rishi kant Anu choudhary Madhusudan Painuly Shantanu Bhattacharya Department of Mechanical Engineering Govind Ballabh Pant Institute of Engineering & Technology Pauri-Garhwal Department of Mechanical Engineering Indian Institute of Technology Kanpur

This paper reports a novel micro-blast driven manufacturing process for micro-forming of Aluminum foils. The micro-blast is realized by using a nanoenergetic material system comprising of Bi_2O_3 microrods and aluminum particles. There is an enhanced need of forming of thin aluminum foil structures in small regions from point of view of drug packaging etc. The process developed caters to this need by using a single shot forming process using a micro-blast source. The micro-blast that is generated from an energetic composite system is made highly tunable by modulating the peak pressure generated through the blasting process and their impact in micro-forming of thin aluminum foils is observed through parametric studies. The engineering challenge involved in these experiments is to tune the blast pressure properties in order to address the forming of thin metal sheets with limiting boundary values as defined by the failure criteria. A variety of characterization techniques related to a thorough analysis of the synthesized material viz. X-ray diffraction(XRD), Scanning Electron Microscopy(SEM) etc, are used to tune the functional properties like gauge blast pressure etc, of material system. We have found a material system that can generate a maximum peak pressure of 73.8 MPa with pressurization rate of 2460 GPas^(-1) and that is able to accomplish micro-forming on thin metal foils(around 0.3 mm thickness). Experimental investigations demonstrate that tunabilty aspect of the energetic composites when exercised can enable variant processes such as embossing, coining, drilling etc. which may be of significant utility to drug packaging industries. A proper mathematical modeling of the forming process and critical process parameters therein have also been detailed.

关键词： Microforming Aluminum Foil Bi2O3 Nanoenergetic Tunability Process parameters

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A new flavone C-glucoside from Glycosmis arborea(Rutaceae)

引用

Chinese Chemical Letters 2010年第12期21卷 1443-1445页

作者： Rajni kant Sharma Sushma Semwal Devendra Singh Negi Department of Chemistry HNB Garhwal Central University SrinagarUttarakhandIndia Department of Chemistry University of Cape TownCape TownRondebosch 7701South Africa

A new C-glycosyl flavone 7,4＇-dihydroxy-5-methoxyflavone-6-C-β-D-glucopyranoside 1 has been isolated and characterized form ethanolic extract of leaves part of Glycosmis *** structure of compound was verified by mea... 详细信息

关键词： Glycosmis arborea Rutaceae Flavone C-glucoside

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Assessment of glacier stored water in Karakoram Himalaya using satellite remote sensing and field investigation

引用

Journal of Mountain Science 2019年第4期16卷 836-849页

作者： Kamal kant SINGH Harendra Singh NEGI Dhiraj Kumar SINGH Snow and Avalanche Study Establishment

Karakoram Himalaya(KH) has continental climatic conditions and possesses largest concentration of glaciers outside the polar regions. The melt water from these glaciers is a major contributor to the Indus river. In this study, various methods have been used to estimate the ice volume in the Karakoram Range of glaciers such as Coregistration of Optically Sensed Images and Correlation(COSI-Corr) method and Area-Volume relations. Landsat 8 satellite data has been used to generate the ice displacement, velocity and thickness map. Our study for 558 Karakoram glaciers revealed that the average ice thickness in Karakoram is 90 m. Ground Penetrating Radar(GPR) survey has been conducted in one of the KH glacier i.e. Saser La glacier and the collected GPR data is used for the validation of satellite derived thickness map. GPR measured glacier thickness values are found comparable with satellite estimated values with RMSE of 4.3 m. The total ice volume of the Karakoram glaciers is estimated to be 1607±19 km3(1473±17 Gt), which is equivalent to 1473±17 km3 of water equivalent. Present study also covers the analysis of glacier surface displacement, velocity and ice thickness values with reference to glacier mean slope.

关键词： Glacier COSI-Corr Karakoram Range Ground Penetrating Radar GPR Volume-Area

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Electron Acceleration by a radially polarised cosh-Gaussian laser beam in vacuum

引用

Communications in Theoretical Physics 2021年第9期73卷 124-128页

作者： Jitender Singh Jyoti Rajput Harjit Singh Ghotra Niti kant Department of Physics Lovely Professional UniversityG.T.RoadPhagwara(144411)PunjabIndia Extreme Light Infrastructure-Nuclear Physics(ELI-NP) Horia Hulubei NIPNE30 Reactorului Street077125 MagureleJud.IifovRomania

In this paper,a radially polarised cosh-Gaussian laser beam(CGLB)is used to study the electron acceleration produced in vacuum.A highly energetic electron beam can be achieved by a CGLB,even with comparatively low-powered *** properties of a CGLB cause it to focus earlier,over a shorter duration than a Gaussian laser beam,which makes it suitable for obtaining high energies over small *** is found that the energy gained by the electrons strongly depends upon the decentering parameter of the laser *** is also observed that for a fixed value of energy gain,if the decentering parameter is increased,then the intensity of the laser field *** dependence of the energy gained by electrons on the laser intensity and the laserspot size is also studied.

关键词： cosh-Gaussian laser beam vacuum electron acceleration decentered parameter

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Root growth dynamics during recovery of tropical mountain forest in North-east India

引用

Journal of Mountain Science 2019年第10期16卷 2335-2347页

作者： Chalthleng LALNUNZIRA Francis Q.BREARLEY Shri kant TRIPATHI Department of Forestry Mizoram UniversityAizawl 796 004India School of Science and the Environment Manchester Metropolitan UniversityChester StreetManchesterM1 5GDUK

Ever increasing pressures on tropical forests worldwide due to anthropogenic disturbances have greatly affected both above-and belowground functioning of these *** fine roots play major ecological roles in forests through assisting in nutrient and water uptake and returning elements to the soil environment,coarse roots play an important role in C *** studied changes in fine and coarse root biomass,production,turnover and carbon and nitrogen return to the soil in two regenerating forest stands(RFs)following stonemining that were 5 years(RF-5)and 15 years(RF-15)post-disturbance compared with a natural forest stand(NF)in Mizoram,North-east ***(<2mm)and coarse root(2-10 mm)biomass differed significantly among the forest stands and ranged from239(RF-5)to 415(NF)and 230(RF-5)to 436(NF)g m 2,*** root(fine+coarse)biomass increased during stand development but the proportion of very fine root(<0.5 mm)to total root production *** root biomass decreased with increasing soil *** and total root biomass showed strong seasonal correlations with soil moisture,more so than for rainfall and temperature,whereas these relationships were less clear for the coarse root *** amount of N(25-55 kg ha-1)and C(1.9-3.6t ha-1)stored in root biomass increased with stand age with a corresponding increase in production and turnover of C and N to the *** to these tropical forests negatively affected root dynamics,influenced their spatiotemporal patterns,and reduced the production,amount and availability of nutrients returned to the soil along with a strong reduction in the root biomass carbon pool and sequestration in carbon residence *** observed that root growth,especially fine roots,is dependent on abiotic variables,and plays a significant role in early stages of secondary succession by adding organic matter and nutrients through high turnover rates in these forests.

关键词： Total root biomass Element return Regenerating forest Root production and turnover Anthropogenic disturbance

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

On Semi-infinite Mathematical Programming Problems with Equilibrium Constraints Using Generalized Convexity

引用

Journal of the Operations Research Society of China 2020年第4期8卷 619-636页

作者： Bhuwan Chandra Joshi Shashi kant Mishra Pankaj Kumar Centre for Interdisciplinary Mathematical Sciences Department of Science&TechnologyInstitute of ScienceBanaras Hindu UniversityVaranasi 221005India Department of Mathematics Institute of ScienceBanaras Hindu UniversityVaranasi 221005India Mahila Maha Vidyalaya Banaras Hindu UniversityVaranasi 221005India

In this paper,we consider semi-infinite mathematical programming problems with equilibrium constraints(SIMPPEC).By using the notion of convexificators,we establish sufficient optimality conditions for the *** formulate Wolfe and Mond–Weir-type dual models for the SIMPPEC under the invexity and generalized invexity *** and strong duality theorems are established to relate the SIMPPEC and two dual programs in the framework of convexificators.

关键词： Duality Convexificators Generalized invexity Constraint qualification

来源：

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

Drainage of pancreatic fluid collections in acute pancreatitis:A comprehensive overview

引用

World Journal of Clinical Cases 2022年第20期10卷 6769-6783页

作者： Akash Bansal Pankaj Gupta Anupam K Singh Jimil Shah Jayanta Samanta Harshal S Mandavdhare Vishal Sharma Saroj kant Sinha Usha Dutta Manavjit Singh Sandhu Rakesh Kochhar Department of Radiodiagnosis Postgraduate Institute of Medical Education and ResearchChandigarh 160012India Department of Gastroenterology Postgraduate Institute of Medical Education and ResearchChandigarh 160012India

Moderately severe and severe acute pancreatitis is characterized by local and systemic *** complications predominate the early phase of acute pancreatitis while local complications are important in the late phase of the *** fluid collections represent the most important local *** of these collections is indicated in the setting of infection,persistent or new onset organ failure,compressive or pressure symptoms,and intraabdominal ***,endoscopic,and minimally invasive surgical drainage represents the various methods of drainage with each having its own advantages and *** methods are often *** this minireview,we discuss the indications,timing,and techniques of drainage of pancreatic fluid collections with focus on percutaneous catheter *** also discuss the novel methods and techniques to improve the outcomes of percutaneous catheter drainage.

关键词： Pancreatitis,Acute necrotizing Drainage Catheters Stents Therapeutic irrigation Debridement Collections

来源：

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

Photo-induced optical changes in GexAs40Se60-x thin films

引用

Progress in Natural Science:Materials International 2010年第1期20卷 54-60页

作者： Rashmi CHAUHAN Amit Kumar SRIVASTAVA Arvind TRIPATHI Krishna kant SRIVASTAVA Department of Physic DAV College Kanpur 208001India 2. Material Science Programme ⅡT Kanpur 208016India 3. Epsilonium Systems Commercial ComplexChunniganjKanpur 208001India 4. Department of Physics DBS CollegeKanpur 208006India

Ge-As-Se chalcogenide thin films show a wide range of photosensitivity,which is utilized for the fabrication of micro-optical elements for integrated *** photosensitivity of GexAs40Se60-x(x=0,15)chalcogenide thin films for UV light was *** that purpose,the bulk samples of GexAs40Se60-x(x=0,15)chalcogenide glasses were prepared using conventional melt quenching technique,and thin films were prepared using thermal evaporation *** thin films were exposed to UV light for two *** natures of bulk samples and thin films were verified by XRD and chemical compositions were verified by EDX *** thicknesses of the thin films were measured using a thickness *** optical analysis of these thin films was done using transmission spectra in wavelength range of 300-900 *** bandgap was determined by first peak of transmission derivative as well as extrapolation of Tauc’s plot.R~2 analysis was done using R software to ensure that the material is indirect bandgap *** is observed that two hours UV exposure causes photo-darkening along with photo-expansion in As40Se60thin films,while photo-bleaching and photo-densification for Ge15As40Se45thin ***,the amounts of photo-induced optical changes for Ge15As40Se45thin films are smaller than those for As40Se60thin *** changes in optical absorption,bandgap and thickness are understood based on the bonding rearrangement caused by UV exposure.

关键词： chalcogenide glasses thin films optical properties photo-induced effect optical band gap UV exposure R software

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Linear and nonlinear optical changes in amorphous As2Se3 thin film upon UV exposure

引用

Progress in Natural Science:Materials International 2011年第3期21卷 205-210页

作者： Rashmi CHAUHAN Amit Kumar SRIVASTAVA Arvind TRIPATHI Krishna kant SRIVASTAVA Department of Physic DAV CollegeCSJM UniversityKanpur208001India Department of Physics DBS CollegeCSJM UniversityKanpur208006India Materials Science Programme 4. Research Foundation for Education and Technology 5. Department of Physics DBS CollegeCSJM University

Amorphous As2Se3chalcogenide thin film was exposed to UV light(i line and g line) using mercury lamp for 30 min. XRD,UV/VIS spectroscopy and thickness measurements were taken for unexposed and exposed thin film for structural and optical *** optical constants(linear refractive index,extinction coefficient and linear optical absorption coefficient) of the film were calculated from transmission spectra using Swanepoel *** bandgap was determined using Tauc’s relation of indirect bandgap *** of the material was described by single-oscillator Wemple-DeDiDomenico model. Nonlinear optical constants(χ~((3)) and n2) were determined from linear optical parameters using semi-empirical relations in long wavelength *** changes in linear optical parameters(increase in refractive index,and extinction coefficient;reduction in optical bandgap),nonlinear optical parameter(increase inχ~((3))) are proposed for various photonic applications.

关键词： amorphous chalcogenide thin films UV exposure optical properties swanepoel method Wemple-DeDiDomenico model semi-empirical relations

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Simulation of the effect of quantum dot location on a quantum dot p-i-n junction solar cell

引用

International Journal of Modeling, Simulation, and Scientific Computing 2017年第4期8卷 140-150页

作者： C.J.kant K.B.K.Mayya Department of Solar Energy School of Technology Pandit Deendayal Petroleum UniversityRaisan Gandhinagar382007 GujaratIndia

The investigation of the new generation of a photovoltaic cell for the optimized parameters is mainly carried out using modeling and simulation,because the fabrication of quantum structures is still a ***,new models to simulate realistic devices are *** the past,the Drift Diffusion equation has been exploited to simulate quantum well solar cells by introducing various assumptions and new *** Equilibrium Green Function’s Formalism has been widely used to study the transport in the nanostructures of the photovoltaic *** have developed a model of simulating quantum dot(QD)p-i-n junction solar cell by hybridizing the Drift Diffusion Equation and the Transfer Hamiltonian *** developed model is applied to a QD p-i-n junction solar cell to determine the optimized position of the QD within the intrinsic *** results show that when the QD is placed closer to the edges of the i-region,the highest possible efficiency is observed.

关键词： Photovoltaic quantum dot efficiency

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：