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Linear and nonlinear propagation characteristics of multi-Gaussian laser beams

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Chinese Physics B 2020年第11期29卷 370-379页

作者： naveen Gupta Sandeep kumar Lovely Professional University PhagwaraIndia

Theoretical investigation on the propagation characteristics of a new class of laser beams known as multi Gaussian(M.G)laser beams has been *** investigate the linear characteristics,propagation of the laser beam in vacuum has been ***,the nonlinear characteristics have been investigated in *** nonlinearity of the plasma has been modeled by relativistic mass nonlinearity of the plasma electrons in the field of laser *** is based on finding the semi analytical solution of the wave equation for the slowly varying envelope of the laser ***,the dynamical evolutions of the beam width and longitudinal phase of the laser beam have been investigated in detail.

关键词： self-focusing multi Gaussian self phase modulation self-channeling

Strategy and Future Prospects to Develop Room-Temperature-Recoverable NO2 Gas Sensor Based on Two-Dimensional Molybdenum Disulfide

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Nano-Micro Letters 2021年第2期13卷 305-362页

作者： Abhay V.Agrawal naveen kumar Mukesh kumar Functional and Renewable Energy Materials Laboratory Indian Institute of Technology RoparRupnagarPunjab 140001India

Nitrogen dioxide(NO2),a hazardous gas with acidic nature,is continuously being liberated in the atmosphere due to human *** NO2 sensors based on traditional materials have limitations of high-temperature requirements,slow recovery,and performance degradation under harsh environmental *** limitations of traditional materials are forcing the scientific community to discover future alternative NO2 sensitive *** disulfide(MoS2)has emerged as a potential candidate for developing next-generation NO2 gas ***2 has a large surface area for NO2 molecules adsorption with controllable morphologies,facile integration with other materials and compatibility with internet of things(IoT)*** aim of this review is to provide a detailed overview of the fabrication of MoS2 chemiresistance sensors in terms of devices(resistor and transistor),layer thickness,morphology control,defect tailoring,heterostructure,metal nanoparticle doping,and through light ***,the experimental and theoretical aspects used in designing MoS2-based NO2 sensors are also discussed ***,the review concludes the challenges and future perspectives to further enhance the gas-sensing performance of *** and addressing these issues are expected to yield the development of highly reliable and industry standard chemiresistance NO2 gas sensors for environmental monitoring.

关键词： MoS2 NO2 gas sensors Light illumination Heterojunction

Effect of different geometrical non-uniformities on nonlinear vibration of porous functionally graded skew plates: A finite element study

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Defence Technology（防务技术） 2022年第6期18卷 918-936页

作者： H.S.naveen kumar Subhaschandra Kattimani Department of Mechanical Engineering National Institute of Technology KarnatakaSurathkal575025India

This article presents the investigation of nonlinear vibration analysis of tapered porous functionally graded skew(TPFGS)plate considering the effects of geometrical non-uniformities to optimize the thickness in the structural *** TPFGS plate is analyzed considering linearly,bi-linearly,and exponentially varying *** plate’s effective material properties are tailor-made using a modified power-law distribution in which gradation varies along the thickness direction of the TPFGS *** the non-linear finite element formulation to develop the kinematic equation’s displacement model for the TPFGS plate is based on the first-order shear deformation theory(FSDT)in conjunction with von Karman’s *** nonlinear governing equations are established by Hamilton’s *** direct iterative method is adopted to solve the nonlinear mathematical relations to obtain the nonlinear *** influence of the porosity distributions and porosity parameter indices on the nonlinear frequency responses of the TPFGS plate for different skew angles and variable thicknesses are studied for various geometrical *** influence of taper ratio,variable thickness,skewness,porosity distributions,gradation,and boundary conditions on the plate’s nonlinear vibration is *** nonlinear frequency analysis reveals that the geometrical nonuniformities and porosities significantly influence the porous functionally graded plates with varying thickness than the uniform ***,exponentially and linearly variable thicknesses can be considered for the thickness optimizations of TPFGS plates in the structural design.

关键词： Functionally graded material Shear deformation theory Porosity distributions Variable thickness Geometrical skewness Nonlinear free vibration

Power system reconfiguration and loss minimization for a distribution systems using ＂Catfish PSO＂ algorithm

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Frontiers in Energy 2014年第4期8卷 434-442页

作者： K Sathish kumar S naveen School of Electrical Engineering VIT University Vellore 632014 India

One of the very important ways to save electrical energy in the distribution system is network reconfiguration for loss reduction. Distribution networks are built as interconnected mesh networks; however, they are arranged to be radial in operation. The distribution feeder reconfiguration is to find a radial operating structure that optimizes network performance while satisfying operating constraints. The change in network configuration is performed by opening sectionalizing （normally closed） and closing tie （normally opened） switches of the network. These switches are changed in such a way that the radial structure of networks is maintained, all of the loads are energized, power loss is reduced, power quality is enhanced, and system security is increased. Distribution feeder reconfiguration is a complex nonlinear combinator- ial problem since the status of the switches is non- differentiable. This paper proposes a new evolutionary algorithm （EA） for solving the distribution feeder reconfiguration （DFR） problem for a 33-bus and a 16- bus sample network, which effectively ensures the loss minimization.

关键词： distribution system reconfiguration (DFR),power loss reduction catfish particle swarm optimization(catfish PSO) radial structure

Security Attacks in Named Data Networking: A Review and Research Directions

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Journal of Computer Science & Technology 2019年第6期34卷 1319-1350页

作者： naveen kumar Ashutosh kumar Singh Abdul Aleem Shashank Srivastava Department of Computer Science and Engineering Motilal Nehru National Institute of Technology Allahabad Prayagraj 211004India

Contents such as audios,videos,and images,contribute most of the Internet traffic in the current *** content sharing is a tedious *** existing security solutions do not secure data but secure the communicating *** data networking(NDN)secures the data by enforcing the data publisher to sign the *** user can verify the data by using the public key of the *** is resilient to most of the probable security attacks in the TCP/IP model due to its new ***,new types of attacks are possible in *** article surveys the most significant security attacks in NDN such as interest flooding attacks,cache privacy attacks,cache pollution attacks,and content poisoning *** attack is classified according to their behavior and discussed for their detection techniques,countermeasures,and the affected *** article is an attempt to help new researchers in this area to gather the domain knowledge of *** article also provides open research issues that could be addressed by researchers.

关键词： named data networking(NDN) interest flooding attack cache privacy attack cache pollution attack content poisoning attack

Comprehensive evaluation of key management hierarchies for outsourced data

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Cybersecurity 2019年第1期2卷 150-166页

作者： naveen kumar Anish Mathuria Indian Institute of Information Technology VadodaraIndia Dhirubhai Ambani Institute of Information and Communication Technology GandhinagarIndia

Key management is an essential component of a cryptographic access control system with a large number of *** manages the secret keys assigned to the system entities in such a way that only authorized users can access a *** access control allows read access of a resource by the authorized users and disallows *** important objective of a key management is to reduce the secret key storage with each authorized *** this end,there exist two prominent types of key management hierarchy with single key storage per user used for read access control in data outsourcing scenario:user-based and *** this work,we analyze the two types of hierarchy with respect to static hierarchy characteristics and dynamic operations such as adding or revoking user *** analysis shows that the resource-based hierarchies can be a better candidate which is not given equal emphasis in the literature.A new heuristic for minimizing the key management hierarchy is introduced that makes it practical in use even for a large number of users and *** performance evaluation of dynamic operations such as adding or revoking a user’s read subscription is shown experimentally to support our analytical results.

关键词： Key management hierarchy Data outsourcing Access control

Influence of porosity distribution on nonlinear free vibration and transient responses of porous functionally graded skew plates

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Defence Technology（防务技术） 2021年第6期17卷 1918-1935页

作者： naveen kumar H S Subhaschandra Kattimani TNguyen-Thoi Department of Mechanical Engineering National Institute of Technology KarnatakaSurathkal575025India Division of Computational Mathematics and Engineering Institute for Computational ScienceTon Duc Thang UniversityHo Chi Minh CityViet Nam Faculty of Civil Engineering Ton Duc Thang University Ho Chi Minh CityViet Nam

This article deals with the investigation of the effects of porosity distributions on nonlinear free vibration and transient analysis of porous functionally graded skew(PFGS)*** effective material properties of the PFGS plates are obtained from the modified power-law equations in which gradation varies through the thickness of the PFGS plate.A nonlinear finite element(FE)formulation for the overall PFGS plate is derived by adopting first-order shear deformation theory(FSDT)in conjunction with von Karman’s nonlinear strain displacement *** governing equations of the PFGS plate are derived using the principle of virtual *** direct iterative method and Newmark’s integration technique are espoused to solve nonlinear mathematical *** influences of the porosity distributions and porosity parameter indices on the nonlinear frequency responses of the PFGS plate for different skew angles are studied in various *** effects of volume fraction grading index and skew angle on the plate’s nonlinear dynamic responses for various porosity distributions are illustrated in detail.

关键词： Porous functionally graded skew plates Porosity distributions Nonlinear transient response Nonlinear frequency ratio Nonlinear frequency parameter

Does weather affect the growth rate of COVID-19,a study to comprehend transmission dynamics on human health

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Journal of Safety Science and Resilience 2020年第1期1卷 3-11页

作者： Arjun Sil Vanapalli naveen kumar Dept of Civil Engineering NIT SilcharAssam 788010India

The undefendable outbreak of novel coronavirus(SARS-COV-2)lead to a global health emergency due to its higher transmission rate and longer symptomatic duration,created a health surge in a short *** Nov 2019 the outbreak in China,the virus is spreading exponentially *** current study focuses on the relationship between environmental parameters and the growth rate of *** statistical analysis suggests that the temperature changes retarded the growth rate and found that-6.28℃ and+14.51℃ temperature is the favorable range for COVID-19 ***-Richter’s relationship is used to estimate the mean daily rate of exceedance of confirmed cases concerning the change in ***,temperature is the most influential parameter that reduces the growth at the rate of 13-17 cases/day with a 1℃ rise in temperature.

关键词： Covid-19 Pendemic Temperature Health risk

Comparative study of green peas using with blanching & without blanching techniques

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Information Processing in Agriculture 2019年第2期6卷 285-296页

作者： Om Prakash Pandey bimal kumar Mishra Ashok Misra Department of Mechanical Engineering Birla Institute of TechnologyMesraRanchiIndia Department of Mathematics Birla Institute of TechnologyMesraRanchiIndia

This paper attempts to analyze the kinetics involved in the drying of green peas in‘with blanching’and‘without blanching’*** by hot water mixed with a solution of citric acid(0.1–0.2 mg/ml)at 70C–100C is the treatment provided to the samples of green *** analysis shows that the moisture content in green peas of three different sizes is reduced at different temperatures and demonstrates the effect of the rate of drying of the moisture *** different diameters and temperatures,the parameters are analyzed using‘with blanching’and‘without blanching’*** is observed that‘with blanching’process plays a significant role in the reduction of moisture content under different temperatures and diameters in a lesser time as compared to‘without blanching’.The operative activation energy and moisture diffusivity are described by using Fick’s law of *** calculation of effective moisture diffusivity can be done via the utilization of *** drying data is subjected to two models of mathematical nature:Simple Exponential model,and Page *** performance of these models is examined by means of comparing the coefficient of determination(R2),chi-square(v2)and root mean square error(RMSE)between the experimental and forecasted value of moisture ratio obtained‘with blanching’and‘without blanching’.The experimental data was seen to be in accordance with the Page *** comparisons of energy consumption,energy efficiency and also the cost of the drying processes for‘with blanching’and‘without blanching’have been accomplished to optimize and reduce process condition and the cost of the process,respectively.

关键词： Hot air drying Green peas Drying kinetics Blanching Fluidized bed dryer