检索结果-南通市图书馆

Shock wave mitigation using zig-zag structures and cylindrical obstructions

Defence Technology（防务技术） 2021年第6期17卷 1840-1851页

作者： arun Kumar R Vaibhav Pathak Department of Mechanical Engineering Indian Institute of Technology Jodhpur(IITJ)JodhpurRajasthan342037India

The present study focuses on the mitigation of shock wave using novel geometric passages in the flow *** strategy is to produce multiple shock reflections and diffractions in the passage with minimum flow obstruction,which in turn is expected to reduce the shock wave strength at the target *** the present study the interaction of a plane shock front(generated from a shock tube)with various geometric designs such as,1)zig-zag geometric passage,2)staggered cylindrical obstructions and 3)zigzag passage with cylindrical obstructions have been investigated using computational *** is seen from the numerical simulation that,among the various designs,the maximum shock attenuation is produced by the zig-zag passage with cylindrical obstructions which is then followed by zig-zag passage and staggered cylindrical obstructions.A comprehensive investigation on the shock wave reflection and diffraction phenomena happening in the proposed complex passages have also been carried *** the new zig-zag design,the initial shock wave undergoes shock wave reflection and diffraction process which swaps alternatively as the shock front moves from one turn to the other *** cyclic shock reflection and diffraction process helps in diffusing the shock wave energy with practically no obstruction to the flow *** is found that by combining the shock attenuation ability of zig-zag passage(using shock reflection and diffraction)with the shock attenuation ability of cylindrical blocks(by flow obstruction),a drastic attenuation in shock strength can be achieved with moderate level of flow blocking.

关键词： Blast wave mitigation Blockage ratio Geometric obstructions Shock wave reflection and diffraction Zig-zag structure

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

MATHEMATICAL DESCRIPTION OF GROWTH OF MULTIPLE ROOT BRANCHING STRUCTURE IN A PLANT

引用

International Journal of Biomathematics 2013年第3期6卷 1-10页

作者： arun KUMAR Department of Mathematics Government College Kota (Raj.) India

An existing growth model of Edelstien is extended and modified for multiple root branching structure or root hairs of any plant. Numerical and analytical solutions for the model are developed and compared. In the derivation it is assumed that multiple root branches are attached to the root surface that acts as a continuous source of new tips. The numerical scheme is derived with anticipation of the fact that comparison with experimental data may necessitate a more complicated model.

关键词： Uptake parameter asymptotic matching van Genuchten formula relativewater content.

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

Cancer: An unknown territory;rethinking before going ahead

引用

Genes & Diseases 2021年第5期8卷 655-661页

作者： arun Upadhyay Department of Biochemistry Central University of RajasthanRajasthan305817India

Cancer is a disease of altered signaling and metabolism,causing uncontrolled divi-sion and survival of transformed cells.A host of molecules,factors,and conditions have been designated as underlying causes for the inception and progression of the *** enormous amount of data is available,system-wide interaction networks of the genes and proteins are generated over the years and have now reached up to a level of saturation,where we need to shift our focus to the more advanced and comprehensive methods and approaches of data analysis and *** with the availability of enormous literature on this one of the most pressing pathological conditions,a successful cure of the disease seems to be *** treatment plans,like immunotherapy and precision medicine,are being employed for different ***,their actual benefits to the patients would be known only after the evaluation of clinical data over the next few ***,we need to look at few fundamental challenges that should be addressed in more depth before we could devise bet-ter,rigorous,and comprehensive treatment plans and may successfully reach a possible cure of the *** article aims at bringing attention towards some fundamental gaps in our approach towards the disease that leads to failure in devising successful therapeutics.

关键词： Bottom-up approach Evolution of cancer Genetic diversity Immunotherapy Multimodal treatment

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

A novel slot scheduling technique for duty-cycle based data transmission for wireless sensor network

引用

Digital Communications and Networks 2022年第3期8卷 351-358页

作者： Yogesh Tripathi arun Prakash Rajeev Tripathi Department of Electronics and Communication Engineering Motilal Nehru National Institute of Technology AllahabadPrayagraj211004India

The duty cycling process involves turning a radio into an active and dormant state for conserving energy. It is a promising approach for designing routing protocols for a resource-constrained Wireless Sensor Networks (WSNs). In the duty cycle-based WSNs, the network lifetime is improved and the network transmission is increased as compared to conventional routing protocols. In this study, the active period of the duty cycle is divided into slots that can minimize the idle listening problem. The slot scheduling technique helps determine the most efficient node that uses the active period. The proposed routing protocol uses the opportunistic concept to minimize the sender waiting problem. Therefore, the forwarder set will be selected according to the node's residual active time and energy. Further, the optimum routing path is selected to achieve the minimum forwarding delay from the source to the destination. Simulation analysis reveals that the proposed routing scheme outperforms existing schemes in terms of the average transmission delay, energy consumption, and network throughput.

关键词： Duty cycle Energy model Wireless sensor network Slot scheduling technique

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

Estimation of total water storage changes in India

引用

International Journal of Digital Earth 2021年第10期14卷 1294-1315页

作者： arun Mondal Venkataraman Lakshmi School of Earth Ocean and the Environment University of South CarolinaColumbiaSCUSA Department of Engineering Systems and Environment University of VirginiaCharlottesvilleVAUSA

Long-term droughts significantly impact surface and groundwater resources in India,however,observed changes in major river basins have not been well *** we use Standardized Precipitation Index(SPI)and Standardized Precipitation Evapotranspiration Index(SPEI)at three different time scales(24,48,and 60 months)to identify long-term droughts in India for the observed record of *** characteristics(extent,events,frequency,and intensity)are analyzed for different river basins in *** trend in the areal extent of droughts is observed in two methods with three time scales in the maximum area(63.66%)in *** use the data from the Gravity Recovery and Climate Experiment(GRACE)to estimate the changes in the terrestrial water storage(TWS)during the period *** identify that major long-term droughts in India occurred from 1966 to 1969,1972,1986-1987,and *** all-India average TWS shows a negative trend from 2002 to 2015 with prominent decline in north Indian river basins and positive trend in south Indian river *** and SPEI at longer time scales are positively associated with TWS indicating the adverse impacts of droughts on surface and groundwater resources in such a populated region.

关键词： Standardized Precipitation Index(SPI) Standardized Precipitation Evapotranspiration Index(SPEI) the Gravity Recovery and Climate Experiment(GRACE) terrestrial water storage anomaly(TWSA)

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

Review on mechanism and process of surface polishing using lasers

引用

Frontiers of Mechanical Engineering 2019年第3期14卷 299-319页

作者： arun KRISHNAN Fengzhou FANG Centre of Micro/Nano Manufacturing Technology (MNMT-Dublin) University College Dublin Dublin 4 Ireland State Key Laboratory of Precision Measuring Technology and Instruments Centre of Micro/Nano Manufacturing Technology (MNMT) Tianjin University Tianjin 300072 China

Laser polishing is a technology of smoothening the surface of various materials with highly intense laser beams. When these beams impact on the material surface to be polished, the surface starts to be melted due to the high temperature. The melted material is then relocated from the ‘peaks to valleys’ under the multidirectional action of surface tension. By varying the process parameters such as beam intensity, energy density, spot diameter, and feed rate, different rates of surface roughness can be achieved. High precision polishing of surfaces can be done using laser process. Currently, laser polishing has extended its applications from photonics to molds as well as bio-medical sectors. Conventional polishing techniques have many drawbacks such as less capability of polishing freeform surfaces, environmental pollution, long processing time, and health hazards for the operators. Laser polishing on the other hand eliminates all the mentioned drawbacks and comes as a promising technology that can be relied for smoothening of initial topography of the surfaces irrespective of the complexity of the surface. Majority of the researchers performed laser polishing on materials such as steel, titanium, and its alloys because of its low cost and reliability. This article gives a detailed overview of the laser polishing mechanism by explaining various process parameters briefly to get a better understanding about the entire polishing process. The advantages and applications are also explained clearly to have a good knowledge about the importance of laser polishing in the future.

关键词： laser polishing surface roughness process parameters mechanism

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

Effect of simvastatin on paraoxonase 1(PON1) activity and oxidative stress

引用

Asian Pacific Journal of Tropical Medicine 2010年第4期3卷 310-314页

作者： arun Kumar Department of Biochemistry College of MedicineThe West Bengal University of Health SciencesKalyaniNadia Pin:741235

Objective:To investigate the effect of simvastatin treatment on lipid pr of ile and oxidative stress in hypercholesterolaemic Indian population and determine the effect of simvastatin treatment on the activity of paraoxonase（PON）.Methods:Analyzed initially before medication administration and four months later after *** and lipoprotein measurement were done by enzymatic kits,high density lipoprotein（HDL） was determined by phosphotungstic acid precipitation method and low density lipoprotein（LDL） was calculated by Friedewald’s *** peroxidation was measured by three markers namely,conjugated diene,total peroxide,and *** diene was assayed by Buege and Aust *** peroxide was determined by FOX2 *** determination was carried out by Flemming method and total antioxidant status was determined by *** activity was determined by measuring the absorbance inrease of p-nitrophenol at 405 *** activity was calculated from the molar coefficient of 1 310 M-1 cm-1.Results:Simvastatin significantly reduced total cholesterol,triglycerides,LDL,conjugated diene,total peroxide and MDA levels,where as antioxidant status was significantly ***,simvastatin significantly increased PON1 activity towards ***:The results from the current study indicate simvastatin may have important antioxidant properties via increasing PON activity.

关键词： Hypercholesterolaemia Simvastatin Oxidative stress India

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

Performance analysis and design of MIMO-OFDM system using concatenated forward error correction codes

引用

Journal of Central South University 2017年第6期24卷 1322-1343页

作者： arun Agarwal Saurabh N.Mehta PhD Scholar School of Electrical EngineeringDepartment of Information TechnologyAMET UniversityTamil NaduChennai 603112India Department of Electronics and Telecommunication Engineering Vidyalankar Institute of TechnologyMumbai-400037MaharashtraIndia

This work investigates the performance of various forward error correction codes, by which the MIMO-OFDM system is deployed. To ensure fair investigation, the performance of four modulations, namely, binary phase shift keying(BPSK), quadrature phase shift keying(QPSK), quadrature amplitude modulation(QAM)-16 and QAM-64 with four error correction codes(convolutional code(CC), Reed-Solomon code(RSC)+CC, low density parity check(LDPC)+CC, Turbo+CC) is studied under three channel models(additive white Guassian noise(AWGN), Rayleigh, Rician) and three different antenna configurations(2×2, 2×4, 4×4). The bit error rate(BER) and the peak signal to noise ratio(PSNR) are taken as the measures of performance. The binary data and the color image data are transmitted and the graphs are plotted for various modulations with different channels and error correction codes. Analysis on the performance measures confirm that the Turbo + CC code in 4×4 configurations exhibits better performance.

关键词： bit error rate (BER) convolutional code (CC) forward error correction peak signal to noise ratio (PSNR) Turbo code

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

Polysaccharide Hydrogel Incorporated Carbon Nanofiber Microelectrode for Designing Neural Interfaces

引用

Journal of Bionic Engineering 2019年第4期16卷 696-710页

作者： arun Torris Manohar V.Badiger Polymer Science and Engineering Division CSIR-National Chemical LaboratoryDr.Homi Bhaba RoadPune 411008India

Bionic devices are an integral part of human life,and continuous innovations in their design and functions with the help of nanotechnology has revolutionized the area of neuroscience and ***-interfaces play a key role in bionic devices such as neural implants for efficient transfer of the signal to smart *** report here on the design of a new microelectrode,comprising Carbon Nanofiber (CNF) and a biopolymer,namely carboxymethyl xyloglucan (CMX) hydrogel inside the CNF,which enhances the current density across the interface,Microelectrode was prepared by in-situ cross-linking of CMX inside CNF,with optimized CMX:CNF ratio,resulting in continuous ionic channels confined within the hollow core of *** microscopy images of microelectrodes illustrate the formation ofCMX hydrogel network inside the CNF hollow core without wrapping its *** presence of hydrogel in the CNF was confirmed by Scanning Electron Microscope (SEM) and Transmission Electron Microscopy (TEM).The electrochemical studies indicate the enhancement in charge density as well as the active surface area of the microelectrodes due to the presence ofCMX hydrogel *** microelectrodes have great potential as neural interfaces for designing smart prosthetics with voluntary control.

关键词： carboxymethyl xyloglucan carbon nano fiber hydrogels microelectrode neural interface

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

Gait Recognition by Cross Wavelet Transform and Graph Model

引用

IEEE/CAA Journal of Automatica Sinica 2018年第3期5卷 718-726页

作者： Sagar arun More Pramod Jagan Deore Department of Electronics and Telecommunication Engineering R.C.Patel Institute of Technology

In this paper, a multi-view gait based human recognition system using the fusion of two kinds of features is *** use cross wavelet transform to extract dynamic feature and bipartite graph model to extract static feature which are coefficients of quadrature mirror filter(QMF)-graph wavelet filter bank. Feature fusion is done after normalization. For normalization of features, min-max rule is used and mean-variance method is used to find weights for normalized features. Euclidean distance between each feature vector and center of the cluster which is obtained by k-means clustering is used as similarity measure in Bayesian framework. Experiments performed on widely used CASIA B gait database show that, the fusion of these two feature sets preserve discriminant information. We report 99.90 % average recognition rate.

关键词： Binary sequences feature extraction identification of persons linear discriminant analysis(LDA)

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

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：