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Propulsion and Power Research 2018年第2期7卷 147-157页

作者： D.Srinivasacharya P.vijay kumar Department of Mathematics National Institute of TechnologyWarangal 506004TelanganaIndia

This article focuses on the effect of radiation on mixed convection in a nanofluid along an inclined wavy surface embedded in a non-Darcy porous medium.A coordinate transformation is employed to transform the complex wavy surface to a smooth *** governing equations are transformed into a set of partial differential equations using the nonsimilarity transformation and then a local similarity and non-similarity method is applied to obtain coupled ordinary differential *** resulting equations are linearized using the successive linearization method and then solved by the Chebyshev spectral *** effects of radiation,non-Darcy parameter,Brownian motion parameter,thermophoresis parameter,the amplitude of the wavy surface,angle of inclination of the wavy surface on the non-dimensional heat and nanoparticle mass transfer rates are studied and presented graphically.

关键词： Mixed convection Nanofluid Inclined wavy surface Non-Darcy porous medium Radiation Heat flux

Cooperative Localization and Tracking in Distributed Robot-Sensor Networks

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Tsinghua Science and Technology 2005年第1期10卷 91-101页

作者：张帆 Guilherme S.Pereira vijay kumar General Robotics Automation Sensing and Perception Laboratory University of Pennsylvania Philadelphia PA USA

This paper addresses the problem of real-time position and orientation estimation of networked mobile robots in two-dimensional Euclidean space with simultaneous tracking of a rigid unknown object based on exteroceptive sensory information extracted from distributed vision systems. The sufficient and necessary conditions for team localization are proposed. A localization and object tracking approach based on statistical operators and graph searching algorithms is presented for a team of robots localized with het- erogeneous sensors. The approach was implemented in an experimental platform consisting of car-like mobile robots equipped with omnidirectional video cameras and IEEE 802.11b wireless networking. The experimental results validate the approach.

关键词： cooperative localization multi-robot formation distributed sensor network sensor data fusion

DWT-SVD Based Image Steganography Using Threshold Value Encryption Method

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Computers, Materials & Continua 2022年第8期72卷 3299-3312页

作者： Jyoti Khandelwal vijay kumar Sharma Dilbag Singh Atef Zaguia School of Computing and Information Technology(SCIT) Manipal University JaipurJaipur302004India School of Electrical Engineering and Computer Science Gwangju Institute of Science and TechnologyGwangju61005Korea Department of Computer Science College of Computers and Information Technology Taif University11099Saudi Arabia

Digital image steganography technique based on hiding the secret data behind of cover image in such a way that it is not detected by the human visual *** paper presents an image scrambling method that is very useful for grayscale secret *** this method,the secret image decomposes in three parts based on the pixel’s threshold *** division of the color image into three parts is very easy based on the color channel but in the grayscale image,it is difficult to *** proposed image scrambling method is implemented in image steganography using discrete wavelet transform(DWT),singular value decomposition(SVD),and sorting *** is no visual difference between the stego image and the cover *** extracted secret image is also similar to the original secret *** proposed algorithm outcome is compared with the existed image steganography *** comparative results show the strength of the proposed technique.

关键词： Image steganography threshold value sorting discrete wave transformation singular value decomposition color band division permutation

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

Probiotics media: significance, challenges, and future perspective - a mini review

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Food Production, Processing and Nutrition 2022年第1期4卷 211-223页

作者： vijay kumar Bindu Naik Akhilesh kumar Naresh Khanduri Sarvesh Rustagi Sanjay kumar Department of Biosciences Swami Rama Himalayan UniversitySwami Rama NagarJolly GrantDehradun248016UttarakhandIndia Department of Life Sciences Graphic Era(Deemed to Be)UniversityBell RoadClement Town DehradunUttarakhand248001India Department of Food Technology UCALSUttaranchal UniversityDehradunUttarakhandIndia

The health benefits associated with probiotics have increased their application in pharmaceutical formulations and functional food development. High production of probiotic biomass requires a cost-effective production method and nutrient media optimization. The biomass production of probiotics can be enhanced by optimizing growth parameters such as substrate, pH, incubation time, etc. For economical industrial production of probiotic biomass, it is required to design a new medium with low cost. Wastes from the food industries are promising components for the development of the low-cost medium. Industrial wastes such as cheese whey and corn steep liquor are excellent examples of reliable sources of nitrogen for the biomass production of probiotic bacteria. The increased yield of biomass reduced the cost of production. This review focuses on the importance of probiotic media for biomass production and its challenges.

关键词： Probiotics Media Health benefits Production

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

Neglected scrub typhus:An updated review with a focus on omics technologies

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Asian Pacific Journal of Tropical Medicine 2022年第12期15卷 531-541页

作者： Dixit Sharma Ankita Sharma Birbal Singh Sunil kumar Shailender kumar verma Centre for Computational Biology and Bioinformatics School of Life SciencesCentral University of Himachal PradeshKangra 176206India Department of Animal Science School of Life SciencesCentral University of Himachal PradeshKangra 176206India ICAR-Indian Veterinary Research Institute Regional StationPalampur 176061India

Scrub typhus is a neglected disease and one of the most serious health problems in the Asia-Pacific *** disease is caused by an obligate intracellular bacteria Orientia tsutsugamushi,which is transmitted by chigger bites or larval mite *** typhus is a threat to billions of people worldwide causing different health complications and acute encephalitis in infants and growing *** disease causes multiple organ failure and mortality rates may reach up to 70%due to a lack of appropriate *** available genome and proteome databases,and bioinformatics methods are valuable tools to develop novel therapeutics to curb the *** review discusses the state-of-the-art of information about Orientia tsutsugamushi-mediated scrub typhus and delineates the role of omics technologies to develop drugs against the *** role of proteome-wide in silico approaches for the identification of therapeutic targets is also highlighted.

关键词： Orientia tsutsugamushi Scrub typhus Therapeutic targets Omics technologies Drug discovery

Evaluation of cytotoxic and anti-tumor activity of partially purified serine protease isolate from the Indian earthworm Pheretima posthuma

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Asian Pacific Journal of Tropical Biomedicine 2013年第11期3卷 896-901页

作者： Mahendra kumar verma Francies Xavier Yogendra kumar verma Kota Sobha Department of Biotechnology R.V.R.& J.C.College of Engineering Department of Microbiology All India Institute of Medical Sciences

Objective:To isolate,partially purify and evaluate the cytotoxic and antitumor activity of a serine protease from the chosen Indian earthworm Pheretima ***:Whole animal extract was prepared and purified its protein constituents by size and charge based chromatographic separation techniques using Sephadex G-50 and DEAE-Cellulose resin *** molecular weight of the protein isolate was determined and analyzed for its cytotoxic property against Vero cells in different dilutions(1:20 and 1:40)and anti-tumor activity by MTT assay(a colorimetric assay)using breast cancer cell line MCF-7,with tamoxifen as ***:One of the protein constituents after purification was characterized as serine protease by Caseinolytic plate diffusion *** molecular weight of this purified isolate was determined,by SDS-PAGE analysis with standard protein ladder,as of 15 *** performed tests suggested that the 15kDa fraction has potent cytotoxic activity and satisfactory antitumor activity as well in ***:Exact molecular mechanism of the cytotoxic and antitumor activities is yet to be explored and currently we are working on ultra-purification and biophysical characterization of this *** investigation into the mechanism(s)of cytotoxic and antitumor activities at molecular level would be useful in treatment of various classes of cancer and viral infections in future.

关键词： Earthworm fibrinolytic enzyme Cytotoxicity Antitumor activity Serine protease Minimum inhibitory concentration

Characteristics of La-modified Ni-Al_2O_3 and Ni-SiO_2 catalysts for CO_x-free hydrogen production by catalytic decomposition of methane

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Journal of Energy Chemistry 2013年第6期22卷 853-860页

作者： Chatla Anjaneyulu Velisoju vijay kumar Suresh K.Bhargava Akula Venugopal Inorganic & Physical Chemistry Division CSIR-Indian Institute of Chemical Technology College of Science Engineering and Health Advanced Materials & Industrial Chemistry School of Applied Sciences RMIT University

Hydrotalcite precursors of La modified Ni-Al2O3 and Ni-SiO2 catalysts prepared by co-precipitation method and the catalytic activities were examined for the production of COx-free H2 by CH4 decomposition. Physico-chemical characteristics of fresh, reduced and used catalysts were evaluated by XRD, TPR and O2 pulse chemisorptions, TEM and BET-SA techniques. XRD studies showed phases due to hydrotalcite-like precursors in oven dried form produced dispersed NiO species upon calcination in static air above 450 C. Raman spectra of deactivated samples revealed the presence of both ordered and disordered forms of carbon. Ni-La-Al2O3catalyst with a mole ratio of Ni : La : Al = 2 : 0.1 : 0.9 exhibited tremendously high longevity with a hydrogen production rate of 1300 molH2 mol 1 Ni. A direct relationship between Ni metal surface area and hydrogen yields was established.

关键词： CH4 decomposition Ni-La-Al hydrotalcite Ni metal surface area COx-free H2

Viral hepatitis: A global burden needs future directions for the management

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World Journal of Gastroenterology 2022年第16期28卷 1718-1721页

作者： Henu kumar verma Kiran Prasad Pramod kumar Bhaskar Lvks Department of Immunopathology Institute of Lungs Biology and DiseaseComprehensive Pneumology CenterHelmholtz ZentrumMunich 80331BayrenGermany Department of Zoology Guru Ghasidas VishwavidyalayaBilaspur 495001ChhattisgarhIndia Department of Drug Delivery Institute of Lung Biology and DiseaseHelmholtz Research CenterMunich 80331BayrenGermany

Viral hepatitis is an acute or chronic liver disease due to the infection from Hepatitis A,B,C,D and E *** can cause severe liver damage such as cirrhosis,liver failure and liver *** avoid such fatal complications,hepatitis patients must be diagnosed,pathologized and treated as soon as ***,these hepatitis viruses infect through different routes,resulting in distinct disease pathologies,severity and even the need for specific treatment strategies to combat the infection.

关键词： Viral hepatitis Vaccination Chronic Acute Viral therapy