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International Journal of Modeling, Simulation, and Scientific Computing 2022年第1期13卷 131-174页

作者： Pratibha verma Manoj kumar Anand Shukla Department of Mathematics Motilal Nehru National Institute of Technology Allahabad Prayagraj–211004 Uttar PradeshIndia†Department of Mathematics Wollega UniversityNekemteEthiopia

This article introduces the computational analytical approach to solve the m-dimensional space-time variable Caputo fractional order advection–dispersion equation with the Dirichlet boundary using the two-step Adomian decomposition method and obtain the exact solution in just one ***,with the help of fixed point theory,we study the existence and uniqueness conditions for the positive solution and prove some new ***,obtain the Ulam–Hyers stabilities for the proposed *** gen-eralized examples are considered to show the method’s applicability and compared with other existing numerical *** present method performs exceptionally well in terms of efficiency and ***,we solved both examples using the two most well-known numerical methods and compared them with the TSADM solution.

关键词： Fixed point theorems space-time variable Caputo’s fractional operators advection-dispersion equation Ulam-Hyers stability two-step Adomian decomposition method

Efficient discrete firefly algorithm for Ctrie based caching of multiple sequence alignment on optimally scheduled parallel machines

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CAAI Transactions on Intelligence Technology 2019年第2期4卷 92-100页

作者： Soniya Lalwani Harish Sharma Abhay verma Rajesh kumar Department of Computer Science & Engineering Rajasthan Technical University Kota India Department of Electrical Engineering Malaviya National Institute of Technology Jaipur India

This study introduces a two-level strategy for efficient execution of multiple sequence alignment (MSA) of complex heterogeneous sequences. The two levels of the proposed technique are comprised of: designing the discrete firefly algorithm (DFFA) for the formation and implementation of makespan minimisation on parallel machines, followed by performing Ctrie-based caching for pairwise alignment to reduce the load on the data servers for handling multiple queries. The proposed strategy addresses a multi-client problem that aims to acquire the full advantage of the computational power of parallel connected machines. Further, it is shown that the inclusion of Ctrie as caching mechanism successively improves the performance of the system with accretion in several sequences. Performance of proposed DFFA is also compared with discrete versions of four swarm intelligence based algorithms at the criteria of makespan minimisation and the rate of convergence on two kinds of complex and diverse datasets. The work is unique in this sense: it is the first swarm-intelligence-based implementation for the addressed problem;it is so far the first approach for Ctrie based caching of the MSA on the scheduled parallel machines;hybridisation of DFFA with Ctrie for caching the MSA results is also a novel implementation.

关键词： strategy execution machines

Bibliometric analysis of Blockchain in the healthcare domain

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Intelligent and Converged Networks 2023年第4期4卷 305-312页

作者： Shilpi Garg Rajesh kumar Kaushal Naveen kumar Anshul verma Chitkara Institute of Engineering and Technology Chitkara UniversityPunjab 140401India Institute of Science Banaras Hindu UniversityVaranasi 221005India

As an innovation,Blockchain has transformed numerous industries and sparked the interest of the research community due to its abundance of benefits,opening up diverse research routes in the healthcare sector in the last *** Health 4.0 becoming ubiquitous in the healthcare industry,end-user transactions are being carried out on a decentralized network,making Blockchain profitable to meet the demands of the modern healthcare ***,a detailed analysis of Blockchain is very *** study emphasizes the evolution of science and the preliminary research of Blockchain in healthcare through bibliometric *** the data are extracted from the Scopus database,and the VOSviewer tool is used for analysis.A total of 1152 Scopus articles published between 2018 and 2022 are *** reveal that in 2022,the field of Blockchain experienced a notable increment in the number of publications and a significant growth *** Access became well known in this field and had a large number of *** is observed that China and India are the leading countries in terms of publications on *** study offers a number of recommendations that amateur and professional researchers can use as a benchmark before commencing a Blockchain investigation in the future.

关键词： Blockchain bibliometric healthcare VOSviewer

Carbon nanotubes:A review on risks assessment,mechanism of toxicity and future directives to prevent health implication

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BIOCELL 2021年第2期45卷 267-279页

作者： PIYOOSH kumar BABELE MAHENDRA kumar verma RAVI KANT BHATIA College of Agriculture Rani Laxmi Bai Central Agriculture UniversityJhansi284003India Department of Biological Sciences Indian Institute of Science Education and Research Bhopal(IISERB)Bhopal462066India Department of Biotechnology Himachal Pradesh UniversityShimla171005India

Carbon nanotubes(CNTs)have tremendous applications in almost every walk of life;however,their harmful impacts on humans and the environment are not well *** have been used in various applications ranging from medical science to different engineering branches,to ease human ***,the toxicological profile of CNTs under laboratory conditions cannot be assessed primarily in medical science due to the inconsistent availability of cytotoxic study *** toxicity has been affected by many physicochemical properties(e.g.,size,type of functionalization),concentration,the extent of exposure,mode of exposure,and even the solvents/medium used to dissolve/disperse CNTs for their *** inconsistencies arise due to the variation in synthesis methods as well as the mode of their human *** their unlimited use in various fields,most of CNT toxicity aspects and mechanisms remain ***,in-depth knowledge of CNTs toxicity is scarce,and the available literature shows dissimilarities in experimental data and exposure *** understand the toxicological issues,it is the need of the hour to provide insight into the published data,post-exposure studies,and various factors that may damage the cells due to CNTs *** review article analyses the hazardous potential through toxicological implications and summarizes the detailed mechanism(s)of CNTs studied on the different model organisms,including human cell *** this review article,we hypothesized that thorough knowledge of various aspects,as mentioned above,helps us design and develop possible strategies to reduce the toxicity of nanomaterial to make them safer and secure for humanity’s betterment.

关键词： Nanotechnology CNTs Nanotoxicity Toxicity mechanism Drug delivery

Load frequency control in deregulated power system with wind integrated system using fuzzy controller

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Frontiers in Energy 2013年第2期7卷 245-254页

作者： Yajvender Pal verma Ashwani kumar Department of Electrical & Electronics Engineering UIET PanjabUniversity Chandigarh 160014 India Department of Electrical Engineering National Institute of TechnologyKurukshetra Haryana 132119 India

This paper presents the analysis of load frequency control （LFC） of a deregulated two-area hydro-thermal power system using fuzzy logic controller, with doubly fed induction generators （DFIGs） integrated into both the control areas. The deregulation of power sector has led to the formation of new companies for generation, transmission and distribution of power. The conventional two-area power system is modified to study the effects of the bilateral contracts of companies on the system dynamics. Deregulation creates highly competitive and distributed control environment, and the LFC becomes even more challenging when wind generators are also integrated into the system. The overall inertia of the system reduces, as the wind unit does not provide inertia and isolates from the grid during disturbances. The DFIGs integrated provide inertial support to the system through modified inertial control scheme, and arrests the initial fall in frequency after disturbance. The inertial control responds to frequency deviations, which takes out the kinetic energy of the wind turbine for improving the frequency response of the system. To enhance the participation of the doubly fed induction generator （DFIG） in the frequency control, optimal values of the speed control parameters of the DFIG-based wind turbine have been obtained using integral square error （ISE） technique. The dynamics of the system have been obtained for a small load perturbation, and for contract violation using fuzzy controller.

关键词： frequency regulation fuzzy controller deregulated power system doubly fed induction generator(DFIG) bilateral contract

Multifunctional characteristics of 3D printed polymer nanocomposites under monotonic and cyclic compression

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Defence Technology（防务技术） 2023年第12期30卷 13-22页

作者： Pawan verma Jabir Ubaid Fahad Alam Suleyman Deveci S.kumar Department of Mechanical Engineering Khalifa University of Science and TechnologyMasdar InstituteMasdar CityP.O.Box 54224Abu DhabiUnited Arab Emirates Borouge Pte.Ltd. Innovation CentreSas Al Nakhl6951Abu DhabiUnited Arab Emirates James Watt School of Engineering University of GlasgowGlasgowG128QQUK

This study presents the multifunctional characteristics of multi-walled carbon nanotube(MWCNT)/polypropylene random copolymer(PPR) composites enabled via fused filament fabrication(FFF) under monotonic and quasi-static cyclic compression. Utilizing in-house MWCNT-engineered PPR filament feedstocks, both bulk and cellular composites were realized. The morphological features of nanocomposites were examined via scanning electron microscopy, which reveals that MWCNTs are uniformly dispersed. The uniformly dispersed MWCNTs forms an electrically conductive network within the PPR matrix, and the resulting nanocomposite shows good electrical conductivity(~10^(-1)S/cm), improved mechanical performance(modulus increases by 125% and compressive strength increases by 25% for 8 wt% MWCNT loading) and pronounced piezoresistive response(gauge factor of 27.9-8.5 for bulk samples)under compression. The influence of strain rate on the piezoresistive response of bulk samples(4 wt% of MWCNT) under compression was also measured. Under repeated cyclic compression(2% constant strain amplitude), the nanocomposite exhibited stable piezoresistive performance up to 100 cycles. The piezoresistive response under repeated cyclic loading with increasing strain amplitude of was also *** gauge factor of BCC and FCC cellular composites(4 wt% of MWCNT) with a relative density of 30%was observed to be 46.4 and 30.2 respectively, under compression. The higher sensitivity of the BCC plate-lattice could be attributed to its higher degree of stretching-dominated deformation behavior than the FCC plate-lattice, which exhibits bending-dominated behavior. The 3D printed cellular PPR/MWCNT composites structures were found to show excellent piezoresistive self-sensing characteristics and open new avenues for in situ structural health monitoring in various applications.

关键词： Carbon nanotubes Nanoengineered polymer composites 3D printing Piezoresistive self-sensing Lattice structures

Dynamic contribution of variable-speed wind energy conversion system in system frequency regulation

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Frontiers in Energy 2012年第2期6卷 184-192页

作者： Yajvender Pal verma Ashwani kumar Department of Electrical&Electronics Engineering UIETPanjab UniversityChandigarh 160014India Department of Electrical Engineering National Institute of TechnologyKurukshetraHaryana 132119India

Frequency regulation in a generation mix having large wind power penetration is a critical issue, as wind units isolate from the grid during disturbances with advanced power electronics controllers and reduce equivalent system inertia. Thus, it is important that wind turbines also contribute to system frequency control. This paper examines the dynamic contribution of doubly fed induction generator （DFIG）-based wind turbine in system frequency regulation. The modified inertial support scheme is proposed which helps the DFIG to provide the short term transient active power support to the grid during transients and arrests the fall in frequency. The frequency deviation is considered by the controller to provide the inertial control. An additional reference power output is used which helps the DFIG to release kinetic energy stored in rotating masses of the turbine. The optimal speed control parameters have been used for the DFIG to increases its participation in frequency control. The simulations carried out in a two-area interconnected power system demonstrate the contribution of the DFIG in load frequency control.

关键词： doubly fed induction generator (DFIG) load frequency control inertial control wind energy conversion system (WECS)

Analyzing Effect of Demand Rate on Safety of Systems with Periodic Proof-tests

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International Journal of Automation and computing 2007年第4期4卷 335-341页

作者： Manoj kumar A.K.verma A.Srividya Control Instrumentation Division Bhabha Atomic Research CentreTrombayMumbai 400085India Reliability Engineering Group Indian Institute of Technology BombayPowaiMumbai 400076India

Quantitative safety assessment of safety systems plays an important role in decision making at all stages of system lifecycle, i.e., design, deployment and phase out. Most safety assessment methods consider only system parameters, such as configuration, hazard rate, coverage, repair rate, etc. along with periodic proof-tests （or inspection）. Not considering demand rate will give a pessimistic safety estimate for an application with low demand rate such as nuclear power plants, chemical plants, etc. In this paper, a basic model of IEC 61508 is used. The basic model is extended to incorporate process demand and behavior of electronic- and/or computer-based system following diagnosis or proof-test. A new safety index, probability of failure on actual demand （PFAD） based on extended model and demand rate is proposed. Periodic proof-test makes the model semi-Markovian, so a piece-wise continuous time Markov chain （CTMC） based method is used to derive mean state probabilities of elementary or aggregated state. Method to determine probability of failure on demand （PFD）（IEC 61508） and PFAD based on these state probabilities are described. In example, safety indices of PFD and PFAD are compared.

关键词： Probability of failure on demand fail safe Markov model continuous time Markov chain IEC 61508 diagnosis repair proof-test demand safety system.

Post-fire soil nutrient dynamics in a tropical dry deciduous forest of Western Ghats,India

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Forest Ecosystems 2019年第1期6卷 67-75页

作者： Satyam verma Dharmatma Singh Ajeet kumar Singh Shanmuganathan Jayakumar Environmental Informatics and Spatial Modeling Lab Department of Ecology and Environmental Sciences School of Life Sciences Pondicherry University Landscape Level Planning and Management Wildlife Institute of India

Background: The effect of forest fire on soil is complex and relatively less understood than its above ground *** the effect of fire on forest soils can allow improving management of valuable forest ecosystems as adequate and proper information is very important for efficient management. We have studied the recovery of soil properties after fire, using a chronosequence approach(two, five and fifteen years after fire and control). Soil samples were collected from each plot of four fire patches(B0, B2, B5 & B15) from three different depths viz. 0–10(Top), 10–20(Middle), and 20–30 cm(Bottom).Results: Soil organic carbon was lower than unburned plots after the fire and could not recover to the level of unburned plot(B0) even in 15 years. Total N, available P, and extractable K were lower 2-years and 5-years after the fire but are higher than unburned plot after 15-years. Available nitrogen(NO_3^- and NH_4^+) remain unchanged or higher than B0 in burned patches. Soil pH, Bulk Density, Water Holding Capacity, and Electrical Conductivity was lower initially after the fire. Forest fires have affected soil properties considerably. The response of soil properties varied with years after fire and soil ***: Forest fires occur very frequently in the study area. Significant quantities of carbon and total nitrogen are lost to the atmosphere by burning of litter, duff, and soil OM. Because nitrogen is one of the most important soil nutrients, the recapture of N lost by volatilization during a fire must receive special attention. Long-term studies are required to better understand the recovery of soil nitrogen.

关键词： Soil properties Western Ghats Tropical dry deciduous Forest Forest fire Forest soils

Climate change effects in the Western Himalayan ecosystems of India: evidence and strategies

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Forest Ecosystems 2017年第3期4卷 232-240页

作者： Vindhya Prasad Tewari Raj kumar verma Klaus von Gadow Himalayan Forest Research Institute Georg-August University Department of Forestry and Wood Science University of Stellenbosch

Background： The fragile landscapes of the Himalayan region are highly susceptible to natural hazards, and there is ongoing concern about current and potential climate change impacts. This study provides background information on India＇s Western Himalayas and reviews evidence of warming as well as variability in precipitation and extreme ***： Understanding and anticipating the impacts of climate change on Himalayan forest ecosystems and the services they provide to people are critical. Efforts to develop and implement effective policies and management strategies for climate change mitigation and adaptation requires particular new research initiatives. The various studies initiated and conducted in the region are compiled ***： Several new initiatives taken by the Himalayan Forest Research Institute in Shimla are described. This includes new permanent observational field studies, some with mapped trees, in high altitude transitional zones for continuous monitoring of vegetation response. We have also presented new strategies for mitigating potential climate change effects in Himalayan forest ***： Assessment of the ecological and genetic diversity of the Himalayan conifers is required to evaluate potential responses to changing climatic conditions. Conservation strategies for the important temperate medicinal plants need to be developed. The impact of climate change on insects and pathogens in the Himalayas also need to be assessed. Coordinated efforts are necessary to develop effective strategies for adaptation and mitigation.

关键词： Himalayan ecosystem Climate change New strategies High altitude New observational studies