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Fabrication and Characterization of Graphene Based Nanocomposite for Electrical Properties

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Advances in Materials Physics and Chemistry 2015年第1期5卷 22-30页

作者： Manoj kumar Pati Puspalata Pattojoshi Gouri sankar Roy Department of Physics KIIT University Odisha India Department of Physics College of Engineering and Technology Bhubaneswar Odisha India

In the present study, we have described the synthesis of acid functionalized graphene (GE) which was grafted to chitosan (CH) by first reacting the oxidized GE with thionyl chloride to form acyl-chlorinated GE. This product was subsequently dispersed in chitosan and covalently grafted to form GE-chitosan. GE-chitosan was further grafted onto poly(anthranilic acid) (PAA) by free radical polymerization conditions, to yield GE-g-chitosan-g-PAA for our investigations. The structure of GE-CH-PAA composites was characterized by X-ray diffraction (XRD) pattern, Fourier transform infrared (FTIR) spectroscopy, thermo gravimetric analysis (TGA), cyclovoltammetrie (CV) and transmission electron microscopy (TEM). XRD report suggested the strongly crystalline character of the specimen prepared. The performance of cycle voltammeter was attributed to the GE-CH-PAA, which provided a large number of active sites and good electrical conductivity. Experimental results suggested that nanocomposites could be combined together for industrial applications.

关键词： Graphene Chitosan Poly(Anthranilic Acid) Electrical Conductivity

Assessment of Factors Affecting Ephemeral Gully Development in Badland Topography: A Case Study at Garbheta Badland (Pashchim Medinipur,

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International Journal of Geosciences 2013年第2期4卷 461-470页

作者： Pravat kumar Shit Gouri sankar Bhunia Ramkrishna Maiti Department of Geography & Environment Management Vidyasagar University Medinipur India Rajendra Memorial Research Institutes of Medical Sciences (ICMR) Patna Bihar India

Gully erosion in the Paschim Medinipur district of West Bengal, Indiahas been an issue of anxiety, formed by the amputation of soil from narrow channels through the accretion of surface runoff. Here, we attempted to investigate the erosion variability of gully in a micro catchment area, and also scrutinized the gully cross-sectional areas as distinct components of gully volumes. Twelve gullies were randomly selected in different slopes. To determine the geometric growth of the gully dimensions and soil loss, the initial length of gully, the width of the gully and depth of respective gullies was monitored in different seasons. Univariate analysis was conducted to measure the association between gully head retreat and vegetation coverage, slope, rainfall volume and runoff contributing area. We found strong and significant relation between the slope of gully head and linear retreat in the pre monsoon (p 0.008) and post monsoon (p 0.024) season respectively. Conversely, rainfall volume and gully head retreat showed a strong relationship in the pre monsoon (r = 0.80), monsoon (r = 0.66) and post-monsoon period (r = 0.94);while meager relationship was observed with rainfall intensity (r = 0.06). Results also illustrated that the overall retreat of gully head had very strong and positive relationship with the runoff contributing area (r = 0.89, p 0.001), and maximum gully erosion was observed in the monsoon period (55.67%). These results indicate that slope, rainfall and runoff contributing area have a strong positive influence on gully erosion in Paschim Medinipur district, since the initiation of the gully.

关键词： Gully Erosion Gully Heads Rainfall Runoff Contributing Area Sediment Yield

Chinese Grand Strategies in Central Asia:The Role of Shanghai Cooperation Organization and Belt and Road Initiative

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Fudan Journal of the Humanities and Social Sciences 2021年第2期14卷 197-223页

作者： Ramakrushna Pradhan Siba sankar Mohanty Department of Social Science Fakir Mohan UniversityNuapadhiBalasore 756020OdishaIndia The Centre for Diaspora Studies Central University of GujaratGandhinagarIndia

Central Asia has long emerged as a hotspot for both the regional and extra-regional powers for two main reasons:its geopolitical location in the middle of Eurasia between Europe,South Asia,the Middle East,Russia and China,and their abundant and mostly unexplored natural *** on huge untapped hydrocarbon potentials the Central Asian geographical entity in recent years has offered enormous opportunity and appeal for global countries and emerged as a grand chessboard for regional and extra-regional *** is one such new pole in the new great game without which any geopolitical and geo-economic debate on Central Asia would be *** this prelude,this article attempts to analyse China's rise in Central Asia and its strategies to strengthen its position in the heartland region by discarding the much-hyped great game thesis and argues that China’s rise is unparallel and unmatched as testified by the recent Belt and Road Initiative of Beijing.

关键词： China Central Asia SCO BRI New Great Game Geostrategy and Energy Security

Effect of land cover on channel form adjustment of headwater streams in a lateritic belt of West Bengal(India)

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International Soil and Water Conservation Research 2016年第4期4卷 267-277页

作者： Suvendu Roy Abhay sankar Sahu Department of Geography University of KalyaniKalyaniNadia 741235West BengalIndia

Present work is exploring the influence of land cover on channel morphology in 34 headwater catchments of the lateritic belt of West ***-parametric tests(Mann-Whitney U and Kruskal-Wallis)and multivariate analysis(Principal Component Analysis and Canonical Discriminant Function models)have successfully differentiated the performance of land cover on channel morphology adjustment among the three groups of headwater streams(forested,transitional,and agricultural)on the Kunur River Basin(KRB).Spatial Interpolation Techniques reveal that intense land-use change,particularly forest conversion to agricultural land,is significantly increasing channel widths(269%)and cross-section area(78%),whereas agricultural channels become shallower(40%)than would be predicted from forested *** with the dominance of forest and agricultural land are classified as‘C′and‘B′types of streams respectively,as per Rosgen's Stream Classification ***,the work claimed that transitional stream group is the definitive area to exaggerate the river restoration plan to stabilize the anthropogenic deformation on channel morphology.

关键词： Headwater streams Land cover Channel Morphology Canonical discriminant function Spatial interpolation techniques

Chaos and Periodicities in Solar Flare Index from Kandilli Observatory during 1976–2014

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Research in Astronomy and Astrophysics 2020年第7期20卷 177-186页

作者： Soumya Roy Amrita Prasad Koushik Ghosh Subhash Chandra Panja sankar Narayan Patra Department of Applied Electronics and Instrumentation Engineering Haldia Institute of TechnologyHaldiaMidnapore(E)-721657West BengalIndia Department of Mechanical Engineering Jadavpur UniversityKolkata-700032West BengalIndia Department of Mathematics University Institute of TechnologyThe University of BurdwanBurdwan-713104West BengalIndia Department of Instrumentation and Electronics Engineering Jadavpur UniversityKolkata 700106West BengalIndia

The Solar Flare Index is regarded as one of the most important solar indices in the field of solarterrestrial research. It has the maximum effect on Earth of all other solar activity indices and is being considered for describing the short-lived dynamo action inside the Sun. This paper attempts to study the short as well as long-term temporal fluctuations in the chromosphere region of the Sun using the Solar Flare Index. The daily Solar Flare Index for Northern, Southern Hemisphere and Total Disk are considered for a period from January 1976 to December 2014(total 14 245 days) for chaotic as well as periodic *** 0–1 test has been employed to investigate the chaotic behavior associated with the Solar Flare *** test revealed that the time series data is non-linear and multi-periodic in nature with deterministic chaotic features. For periodic analysis, the Raleigh Power Spectrum algorithm has been used for identifying the predominant periods within the data along with their confidence score. The well-known fundamental period of 27 days and 11 years along with their harmonics are well affirmed in our investigation with a period of 28 days and 10.77 years. The presence of 14 days and 7 days periods in this investigation states the short-lived action inside the Sun. Our investigation also demonstrates the presence of other mid-range periods including the famous Rieger type period which are very much confirming the results obtained by other authors using various solar activity indicators.

关键词： chaos method:data analysis Sun:activity Sun:flares Sun:fundamental parameters Sun:rotation

Coating of bioactive glass on magnesium alloys to improve its degradation behavior: Interfacial aspects

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Journal of Magnesium and Alloys 2020年第4期8卷 999-1015页

作者： V.S.Yadav M.R.sankar L.M.Pandey centre for the environment indian institute of technology guwahatiassam781039india department of mechanical engineering indian institute of technology guwahatiassam781039india department of mechanical engineering indian institute of technology tirupatiandhra pradesh517506india department of biosciences and bioengineering indian institute of technology guwahatiassam781039india

The preferable mechanical properties of Mg alloys along with excellent compatibility with human bone have established their applicability as implant ***,a higher corrosion/degradation rate of Mg alloys in body fluids limits its biomedical *** this direction,surface modification and coating are explored as appropriate strategies to mode the degradation rate of Mg *** constituents of bioactive glass(BG)provide strength,bio-inertness and bone bonding ***,researchers have explored the coating of BG on Mg alloys and investigated chemical,mechanical and biological properties of the coated *** this review,we have made an attempt to compile the literature works done on the coating of BG on Mg alloys and its *** interfacial aspects of the coated substrates towards the degradation behavior are *** way forward to further improve the coating characteristics of BG coated Mg alloys are remarked.

关键词： Bioactive glass Magnesium alloys Adhesion strength Coating thickness Wettability Degradation

Characterization of municipal solid waste based on seasonal variations,source and socio-economic aspects

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Waste Disposal and Sustainable Energy 2021年第4期3卷 275-288页

作者： Venkata Ravi sankar Cheela Sudha Goel Michele John Brajesh Dubey Environmental Engineering and Management Department of Civil EngineeringIndian Institute of Technology KharagpurKharagpurWest Bengal 721302India Sustainable Engineering Group Curtin UniversityPerthWA 6102Australia

Municipal solid waste(MSW)generation and characterization are the basic inputs for waste handling and treatment systems *** present research,we performed waste characterization investigations in Visakhapatnam(India),using a waste characterization methodology by integrating two standard sampling and characterization *** characterization methodology was designed by combining seasonal variations,source,and socio-economic ***-based sampling was performed at household(s),dumpster(s),transfer station,and ***-economic-based sampling was performed based on the zone classification of the *** sampling campaigns were conducted to identify the waste composition based on seasonal *** aimed to perform stratified characterization of waste and assess chemical characteristics of the mixed waste fractions to evaluate waste-to-energy *** indicate that the amount of MSW generated in the city is 1250±100 tons/day,with a generation rate of 0.65 kg/capita/*** on source stratification,organic matter(45.5%±6.5%)is a major component followed by inert *** paper,plastic,and textile components amount to 25%of overall *** seasonal studies,organic matter was higher in pre-monsoon(42%)compared to winter(39%).The moisture content of MSW varied between 30%and 35%and volatile solids between 39%and 43%.The calorific value was determined to be between 5680-7110 kJ/*** the limitations and potential errors associated with sampling and waste *** and thermal conversion treatment alternatives for processing,treatment,and handling were *** findings of this research would assist regulatory bodies and city councils to formulate policy directives on waste sampling,characterization,segregation,education,and awareness campaigns.

关键词： Municipal solid waste Waste characterization Source segregation Socio-economic Seasonal variation Waste-to-energy

Cell size: a key determinant of meristematic potential in plant protoplasts

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aBIOTECH 2021年第1期2卷 96-104页

作者： Ipsita Pujari Abitha Thomas Padmalatha SRai Kapaettu Satyamoorthy Vidhu sankar Babu Department of Plant Sciences Manipal School of Life SciencesManipal Academy of Higher EducationManipalKarnataka 576104India Department of Biotechnology Manipal School of Life SciencesManipal Academy of Higher EducationManipalKarnatakaIndia Department of Cell and Molecular Biology Manipal School of Life SciencesManipal Academy of Higher EducationManipalKarnatakaIndia

Metabolic pathway reconstruction and gene edits for native natural product synthesis in single plant cells are considered to be less complicated when compared to the production of non-native *** an efficient eukaryotic system,plants encompass suitable post-translational ***,slow cell division rate and heterogeneous nature is an impediment for consistent product retrieval from plant *** cell synchrony can be attained in cultures developed in *** plant protoplasts capable of division,can potentially enhance the unimpaired yield of target bioactives,similar to microbes and unicellular *** from yeast experiments suggests that‘critical cell size’and division rates for enhancement machinery,primarily depend on culture conditions and nutrient *** cell size control mechanisms in Arabidopsis shoot apical meristem is analogous to yeast notably,fission *** protoplasts isolated from plants are subjected to cell size studies and cell cycle progression in culture,it will answer the underlying molecular mechanisms such as,unicellular to multicellular transition states,longevity,senescence,‘cell-size resetting’during organogenesis,and adaptation to external cues.

关键词： Cell cycle Cell size CRISPR Plant protoplasts TOR signalling

Stock Market Trading Based on Market Sentiments and Reinforcement Learning

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Computers, Materials & Continua 2022年第1期70卷 935-950页

作者： K.M.Ameen Suhail Syam sankar Ashok S.kumar Tsafack Nestor Naglaa F.Soliman Abeer D.Algarni Walid El-Shafai Fathi E.Abd El-Samie Department of Computer Science&Engineering NSS College of EngineeringPalakkad678008KeralaIndia Department of Electronics and Communication Engineering NSS College of EngineeringPalakkad678008KeralaIndia Unitéde Recherche de Matière Condensée D’Electronique et de Traitement du Signal(URAMACETS)Department of PhysicsUniversity of DschangP.O.Box 67DschangCameroon Department of Information Technology College of Computer and Information SciencesPrincess Nourah Bint Abdulrahman UniversityRiyadh84428Saudi Arabia Department Electronics and Electrical Communications Faculty of Electronic EngineeringMenoufia UniversityMenouf32952Egypt

Stock market is a place,where shares of different companies are *** is a collection of buyers’and sellers’*** this digital era,analysis and prediction in the stock market have gained an essential role in shaping today’s *** market analysis can be either fundamental or *** analysis can be performed either with technical indicators or through machine learning *** this paper,we report a system that uses a Reinforcement Learning(RL)network and market sentiments to make decisions about stock market *** system uses sentiment analysis on daily market news to spot trends in stock *** sentiment analysis module generates a unified score as a measure of the daily news about *** score is then fed into the RL module as one of its *** RL section gives decisions in the form of three actions:buy,sell,or *** objective is to maximize long-term future *** have used stock data of Apple from 2006 to 2016 to interpret how sentiments affect *** stock price of any company rises,when significant positive news become available in the public *** results reveal the influence of market sentiments on forecasting of stock prices.

关键词： Deep learning machine learning daily market news reinforcement learning stock market