检索结果-南通市图书馆

A Key Management Scheme Using(p,q)-Lucas Polynomials in Wireless Sensor Network

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

China Communications 2021年第11期18卷 210-228页

作者： Amit kumar Gautam rakesh kumar Madan Mohan Malaviya University of Technology Gorakhpur-273001India

Wireless Sensor Network(WSN)has witnessed an unpredictable growth for the last few *** has many applications in various critical sectors such as real-time monitoring of nuclear power plant,disaster management,environment,military area ***,due to the distributed and remote deployment of sensor nodes in such networks,they are highly vulnerable to different security *** sensor network always needs a proficient key management scheme to secure data because of resourceconstrained *** polynomial based key management schemes are simple,but the computational complexity is a big *** polynomials,Fibonacci polynomials,Chebychev polynomials are used in Engineering,Physics,Combinatory and Numerical analysis *** this paper,we propose a key management scheme using(p,q)-Lucas polynomial to improve the security of ***(p,q)-Lucas polynomial,p represents a random base number while q represents a substitute value of x in the *** value of p is unique,and q is different according to communication between *** of the proposed method on several parameters such as computational overhead,efficiency and storage cost have been performed and compared with existing related *** analysis demonstrates that the proposed(p,q)-Lucas polynomial based key management scheme outperforms over other polynomials in terms of the number of keys used and efficiency.

关键词： key management lucas polynomial WSN security pairwise key distribution key generation hierarchical key management

Surface Modification Aspects for Improving Biomedical Properties in Implants:A Review

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2024年第2期37卷 213-241页

作者： J.Sharath kumar rakesh kumar Rajeev Verma Industrial and Production Department Dr B R Ambedkar National Institute of Technology JalandharJalandharPunjab144008India

The primary focus during surgery is to ensure successful implantation by achieving long-term and stable fixation of *** surgery is now more focused on the development of novel biomaterials intended to improve implant *** obtain a better understanding of metal implants,this article investigated the causes of material failures in certain cases and analysed a few case *** interaction between the implant and bone tissue was a crucial aspect of successful implantation,and this study explored the factors influencing this interaction as well as ways to improve *** modern approaches used for modifying implant surfaces were systematically illustrated and briefly *** spray coatings were often favoured because of their wide range of coating materials,but other substantial surface modifications(such as friction stir processing and laser surface texturing)were also used for a selection of ***,implant surfaces with desirable features,such as biocompatibility,antibacterial properties,corrosion resistance,and wear resistance,were essential for optimising implant *** systematic review's main aim is to provide exhaustive reference information and a broad overview to advance the production and design of orthopaedic implants.

关键词： Biomaterials Surface treatments Thermal spray coatings Antibacterial Biocompatibility Corrosion resistance Wear resistance

MOLECULAR DYNAMICS SIMULATION OF POLYMER/CARBON NANOTUBE COMPOSITES

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

Acta Mechanica Solida Sinica 2015年第4期28卷 409-419页

作者： Sumit Sharma rakesh Chandra Pramod kumar Navin kumar Department of Mechanical Engineering Dr.B.R.Ambedkar National Institute of Technology School of Mechanical Materials & Energy Engineering (SMMEE) Indian Institute of Technology

In this paper, we present classical molecular dynamics （MD） simulations of model polymer/CNT composites constructed by embedding a single wall （10,10） CNT into two different amorphous polymer matrices： poly（methyl methacrylate） and poly{（m-phenylene-vinylene）-co- [（2,5-dioctoxy-p-phenylene） vinylene]}, respectively, with different volume fractions. The simulation results support the idea that it is possible to use CNTs to mechanically reinforce an appropri- ate polymer matrix, especially in the longitudinal direction of the nanotube. The comparison of the simulation results with the macroscopic rule-of-mixtures for composite systems showed that for strong interfacial interactions, there can be large deviations of the results from the rule-of- mixtures. In order to verify this study, results obtained have been compared with those given by Elliott and Han （2007）.

关键词： nano-structures elasticity mechanical properties computational modeling

An overview of chemical enhanced oil recovery and its status in India

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2023年第4期20卷 2305-2323页

作者： Ganesh kumar Pothula rakesh kumar Vij Achinta Bera Department of Petroleum Engineering School of Energy TechnologyPandit Deendayal Energy UniversityGandhinagarGujarat382007India

India is currently producing crude oil from matured fields because of insufficient discoveries of new ***,in order to control the energy crisis in India,enhanced oil recovery(EOR)techniques are required to reduce the import of crude from the OPEC(Organization of the Petroleum Exporting Countries).This review mentions chemical EOR techniques(polymers,surfactants,alkali,nanoparticles,and combined alkali-surfactant-polymer flooding)and operations in *** EOR methods are one of the most efficient methods for oil *** efficiency is enhanced by interfacial tension(IFT)reduction using surfactants and alkali,and mobility control of injected water is done by adding a polymer to increase the volumetric sweep *** paper also reviews the current trend of chemical EOR,prospects of chemical EOR in Indian oilfields,the development of chemical EOR in India with their challenges raising with economics,and screening criteria for chemical EOR implementation on the field ***,the review gives a brief idea about chemical EOR implementation in Indian oilfields in future prospects to increase the additional oil recovery from existing depleted fields to reduce the import of crude *** outcome of this review depicts all chemical EOR operations and recovery rates both at the laboratory scale and field scale around the *** additional recovery rates are compared from various chemical EOR methods like conventional chemical flooding methods and conventional chemicals combined with nanoparticles on a laboratory *** development of chemical EOR in the past few decades and the EOR policy given by the government of India has been mentioned in this *** analysis provides an idea about enhanced recovery screening and implementation of chemical EOR methods in existing fields will significantly reduce the energy crisis in India.

关键词： Chemical enhanced oil recovery Surfactant flooding Polymer flooding Indian oilfields Enhanced oil recovery challenges in India Screening criteria

Design analysis for ultra-low crosstalk in high core count heterogeneous multicore fiber

在线全文

学校读者我要写书评

暂无评论

Optoelectronics Letters 2021年第10期17卷 616-621页

作者： Dablu kumar rakesh Ranjan OFC and Photonics Lab Department of Electronics and Communication EngineeringNational Institute of Technology PatnaPatna 800005India

Design analysis of high core count(36-core,37-core)un-coupled multicore fiber(MCF)using the heterogeneous core has been proposed,to achieve the high spatial efficiency and ultra-low crosstalk(~-81 d B/100 km)under the limited cladding diameter of 300μ*** realize the ultra-low crosstalk level between the neighboring cores,the combination of two crosstalk reduction approaches,trench-assisted(TA)core and propagation direction interleaving(PDI)technique has been *** forward and backward crosstalk characterizations have been studied in heterogeneous MCF with respect to fiber bending radius,wavelength,transmission distance,and core-pitch with both normal step-index and trench-assisted cores under single-mode propagation condition.

关键词： crosstalk fiber trench

STABILITY AND BIFURCATION ANALYSIS OF A DELAYED INNOVATION DIFFUSION MODEL

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2018年第2期38卷 709-732页

作者： rakesh kumar Anuj kumar SHARMA Kulbhushan A GNIHOTRI Department of Applied Sciences S.B.S. State Technical Campus Ferozepur Punjab 152004 India Research Scholar with I.K.G. Punjab Technical University Kapurthala Punjab 144603 India Department of Mathematics L.R.D.A. V. College Jagraon Ludhiana Punjab 142026 India

In this article, a nonlinear mathematical model for innovation diffusion with stage structure which incorporates the evaluation stage （time delay） is proposed. The model is analyzed by considering the effects of external as well as internal influences and other demographic processes such as emigration, intrinsic growth rate, death rate, etc. The asymptotical stability of the various equilibria is investigated. By analyzing the exponential characteristic equation with delay-dependent coefficients obtained through the variational matrix, it is found that Hopf bifurcation occurs when the evaluation period （time delay, T） passes through a critical value. Applying the normal form theory and the center manifold argument, we de- rive the explicit formulas determining the properties of the bifurcating periodic solutions. To illustrate our theoretical analysis, some numerical simulations are also included.

关键词： Innovation diffusion model stability analysis Hopf-bifurcation normal form theory center manifold theorem

Mitigation of the impacts of electric vehicle charging on energy-star ratings for residential buildings in India

在线全文

学校读者我要写书评

暂无评论

Clean Energy 2023年第5期7卷 981-993页

作者： rakesh Dalal Devender kumar Saini Electrical Cluster School of EngineeringUniversity of Petroleum and Energy Studies(UPES)DehradunIndia

The star-labelling programme for residential buildings was introduced by India in 2020 and applies to all residential buildings with no lower limit on the built-up area or electrical *** energy-star label for a residential building is awarded against the notified standard by the regulatory body and electric vehicles(EVs)have not been accommodated as a load for residential *** en-ergy consumption of an existing residential building is taken from a study already carried out and compared with the requirement of the Indian residential star-labelling programme with an EV as a plugged-in *** annual energy gap of 6060 kWh for the existing residential buildings considered in this study for five-star building energy labels increases to 7784 kWh if the EV load is added to the building *** residential building will lose two energy stars if it caters to the EV load and,to bridge this energy gap,the replace-ment of existing electrical appliances with five-star-rated energy appliances,employing grid-connected rooftop solar photovoltaics(PV)and retrofit of the building envelope are *** techno-economic potential of rooftop solar PV and building envelope retrofitting for existing residential buildings is explored using RETScreen®and eQUEST software,*** study establishes that the installation of rooftop solar PV can accommodate the additional load of EVs and can bridge half and three-quarters of the energy gap to achieve five energy stars for an existing building with and without EVs,*** is the most economical option among the options explored in this *** target Energy Performance Index is achievable by high-end energy consumers(12000 kWh/year)by additional measures,the replacement of inefficient electrical appliances and building envelope retrofitting in addition to the installation of rooftop solar PV.

关键词： energy conservation building code energy-star building envelope retrofit EV load

DYNAMICAL BEHAVIOR OF AN INNOVATION DIFFUSION MODEL WITH INTRA-SPECIFIC COMPETITION BETWEEN COMPETING ADOPTERS

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

Acta Mathematica Scientia 2022年第1期42卷 364-386页

作者： rakesh kumar Anuj kumar SHARMA Govind Prasad SAHU Department of Applied Sciences Shaheed Bhagat Singh State UniversityFerozepurPunjab 152004India Department of Mathematics L.R.D.A.V.CollegeJagraonLudhianaPunjab 142026India Center for Basic Sciences Pt Ravishankar Shukla UniversityRaipur(Chhattisgarh).India

In this paper,we proposed an innovation diffusion model with three compartments to investigate the diffusion of an innovation(product)in a particular *** model exhibits two equilibria,namely,the adopter-free and an interior *** existence and local stability of the adopter-free and interior equilibria are explored in terms of the effective Basic Influence Number(BIN)R_(A).It is investigated that the adopter free steady-state is stable if R_(A)<*** consideringτ(the adoption experience of the adopters)as the bifurcation parameter,we have been able to obtain the critical value ofτresponsible for the periodic solutions due to Hopf *** direction and stability analysis of bifurcating periodic solutions has been performed by using the arguments of normal form theory and the center manifold *** numerical simulations in the support of analytical results have been presented.

关键词： intra-specific competition basic influence number local stability Hopf-bifurcation normal form theory center manifold theorem

Better-Than-Worst-Case Design: Progress and Opportunities

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2014年第4期29卷 656-663页

作者：丛京生 Henry Duwe rakesh kumar 李森 ACM IEEE Computer Science Department University of California Los Angeles CA 90095-1596 U.S.A. Electrical and Computer Engineering Department University of Illinois at Urbana-Champaign Urbana IL 61801 U.S.A.

Today, designers are forced to reduce performance and increase power requirements in order to reserve larger margins that are required due to the greater variability introduced by smaller feature sizes and manufacturing variations of modern IC designs. The better-than-worst-case design can both address the variability problem and achieve higher performance/energy efficiency than the worst-case design. This paper surveys the progress to date, provides a snapshot of the most representative methods in this field, and discusses the future research directions of the better-than-worst-case design.

关键词： better-than-worst-case error resilience variability