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A Decisive Study on Dielectric Response of Bi₂O₃/Polystyrene &Bi₂O₃/PVDF Composite as Flexible Electrodes for Energy Storage

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Open Journal of Composite Materials 2023年第1期13卷 1-11页

作者： Dinesh kumar Yadav Anju Yadav sushil kumar jain Narendra Jakhar Balram Tripathi Department of Physics University of Rajasthan Jaipur Rajasthan India Department of Physics School of Basic Science Manipal University Jaipur Jaipur India Department of Physics S S Jain Subodh PG (Auto.) College Jaipur Rajasthan India Department of Physics University of Puerto Rico Sam Juan PR USA

In this manuscript a comparative study on Bi2O3/polystyrene and Bi2O3/PVDF composites has been executed via analysis of structural, bonding, surface morphology and dielectric response of composites for energy storage. The composites have been synthesized using solution cast method by varying concentrations of Bi2O3 (BO = 1 - 5 mw%) into polystyrene (PS) and polyvinylidene fluoride (PVDF) polymers respectively. X-ray diffraction confirms the generation of crystallinity, Fourier transform infrared (FT-IR) spectroscopy confirms bonding behavior and scanning electron microscopy (SEM) confirms uniform distribution of Bi2O3 (BO) in PS and PVDF polymers. Impedance spectroscopy has been employed for determination of dielectric response of the fabricated composites. The dielectric constant has been found to be increased as 1.4 times of pristine PS to BO5%PS95% composites and 1.8 times of pristine PVDF to BO5%PVDF95% composites respectively. These high dielectric composite electrodes are useful for flexible energy storage devices.

关键词： Bismuth Oxide (Bi2O3) Polymer Composites Surface Morphology Dielectric Constant Energy Storage

Performance validation of High Mountain Asia 8-meter Digital Elevation Model using ICESat-2 geolocated photons

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Journal of Mountain Science 2024年第8期21卷 2562-2578页

作者： Giribabu DANDABATHULA Subham ROY Omkar Shashikant GHATAGE Vaibhav Balaso KOLASE Shwetambari SATPUTE Koushik GHOSH Sahibnoor KAUR Satyanarayana PONDARI Apurba kumar BERA sushil kumar SRIVASTAV Regional Remote Sensing Centre-West National Remote Sensing CentreIndian Space Research OrganisationJodhpur 342005India Department of Geography School of Earth SciencesBharathidasan UniversityTiruchirappalli 620024India Centre for Climate Change and Water Research Suresh Gyan Vihar UniversityJaipur 302017India Department of Geography Panjab UniversityChandigarh 160014India National Remote Sensing Centre Indian Space Research OrganisationHyderabad 500037India Regional Centres National Remote Sensing CentreIndian Space Research OrganisationNew Delhi 110049India

High Mountain Asia(HMA),recognized as a third pole,needs regular and intense studies as it is susceptible to climate *** accurate and high-resolution Digital Elevation Model(DEM)for this region enables us to analyze it in a 3D environment and understand its intricate role as the Water Tower of *** science teams of NASA realized an 8-m DEM using satellite stereo imagery for HMA,termed HMA 8-m *** this research,we assessed the vertical accuracy of HMA 8-m DEM using reference elevations from ICESat-2 geolocated photons at three test sites of varied topography and land *** were made from statistical quantifiers and elevation *** the world’s highest mountain,Mount Everest,and its surroundings,Root Mean Squared Error(RMSE)and Mean Absolute Error(MAE)resulted in 1.94 m and 1.66 m,respectively;however,a uniform positive bias observed in the elevation profiles indicates the seasonal snow cover change will dent the accurate estimation of the elevation in this sort of test *** second test site containing gentle slopes with forest patches has exhibited the Digital Surface Model(DSM)features with RMSE and MAE of 0.58 m and 0.52 m,*** third test site,situated in the Zanda County of the Qinghai-Tibet,is a relatively flat terrain bed,mostly bare earth with sudden river cuts,and has minimal errors with RMSE and MAE of 0.32 m and 0.29 m,respectively,and with a negligible ***,in one more test site,the feasibility of detecting the glacial lakes was tested,which resulted in exhibiting a flat surface over the surface of the lakes,indicating the potential of HMA 8-m DEM for deriving the hydrological *** results accrued in this investigation confirm that the HMA 8-m DEM has the best vertical accuracy and should be of high use for analyzing natural hazards and monitoring glacier surfaces.

关键词： High Mountain Asia Digital Elevation Model ICESat-2 geolocated photons Accuracy assessment

An emerging threat Fileless malware:a survey and research challenges

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Cybersecurity 2018年第1期1卷 668-679页

作者： Sudhakar sushil kumar School of Computer&Systems Sciences Jawaharlal Nehru University110067New DelhiIndia Indian Computer Emergency Response Team Ministry of Electronics&Information Technology110003New DelhiIndia

With the evolution of cybersecurity countermeasures,the threat landscape has also evolved,especially in malware from traditional file-based malware to sophisticated and multifarious fileless *** malware does not use traditional executables to carry-out its ***,it does not use the file system,thereby evading signature-based detection *** fileless malware attack is catastrophic for any enterprise because of its persistence,and power to evade any anti-virus *** malware leverages the power of operating systems,trusted tools to accomplish its malicious *** analyze such malware,security professionals use forensic tools to trace the attacker,whereas the attacker might use anti-forensics tools to erase their *** survey makes a comprehensive analysis of fileless malware and their detection techniques that are available in the *** present a process model to handle fileless malware attacks in the incident response *** the end,the specific research gaps present in the proposed process model are identified,and associated challenges are highlighted.

关键词： Fileless malware Botnet Incident response Memory forensics Incident investigation Memory resident malware Rootkit

Morphological, Optical and DC Conduction Properties of a-GaSe Semiconductor Nanoparticle Thin Films

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Journal of Materials Science & Technology 2013年第12期29卷 1151-1155页

作者： sushil kumar M.A. Majeed Khan Materials Science Lab. Department of Physics Chaudhary Devi Lal University Sirsa 125 055 India King Abdullah Institute for Nanotechnology King Saud University Riyadh 11451 Saudi Arabia

Amorphous gallium selenide （a-GaSe） semiconductor nanoparticle thin films were deposited onto well cleaned glass substrates by inert gas condensation （IGC） technique under a vacuum of 400 x 10-6 Pa （3 x 10-6 Torr）. The films were characterized by different structural and optical techniques, including X-ray diffraction, field emission scanning electron microscopy （FESEM）, field emission transmission electron microscopy （FETEM）, UV-visible absorption spectroscopy and I-V measurements. The particle size and size distribution were determined by TEM images which show the presence of spherical particles in the range of 5-50 nm in size. SEM images indicate that the a-GaSe film grown on glass substrate is almost smooth and dense. The optical properties of a-GaSe nanoparticle thin films were determined by optical absorption spectra. The optical bandgap of the film was estimated to be 2.19 eV and the transitions are allowed direct type. The electrical conductivity of the deposited films has been studied as a function of temperature. In the higher temperature range the dominance of thermally activated band conduction was observed; whereas in the low temperature ranqe the hoppinQ conduction in the band tails of localized states was found to be dominated.

关键词： Nanoparticles Thin film Optical bandgap Electrical conductivity

An efficient algorithm to clip a 2D-polygon against a rectangular clip window

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Applied Mathematics(A Journal of Chinese Universities) 2022年第1期37卷 147-158页

作者： sushil Chandra Dimri Umesh kumar Tiwari Mangey Ram Department of Computer Science and Engineering Graphic Era(Deemed to be University)DehradunUttarakhandIndia

Polygon clipping is of great importance in computer *** of the popular algorithms to clip a polygon is Cohan–Sutherland Hodgeman algorithm which is based on line ***–Sutherland Hodgeman algorithm clips the polygon against the given rectangular clip window with the help of line clipping ***–Sutherland algorithm requires traversing the polygon in anti clockwise direction(positive orientation).In this work we propose an efficient polygon clipping algorithm against a rectangular clip *** algorithm uses parametric representation of polygon *** the concept of point clipping,we can find required intersection points of edges of polygon with clip window *** suited numerical illustrations are used to explain the proposed polygon clipping *** proposed algorithm is computationally less expensive and comprehensive.

关键词： point clipping polygon clipping clip window line segment computational complexity

OTS Scheme Based Secure Architecture for Energy-Efficient IoT in Edge Infrastructure

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Computers, Materials & Continua 2021年第3期66卷 2905-2922页

作者： sushil kumar Singh Yi Pan Jong Hyuk Park Department of Computer Science and Engineering Seoul National University of Science and TechnologySeoul01811South Korea Department of Computer Science Georgia State UniversityAtlantaGA30302-5060USA

For the past few decades,the Internet of Things(IoT)has been one of the main pillars wielding significant impact on various advanced industrial applications,including smart energy,smart manufacturing,and *** applications are related to industrial plants,automation,and e-healthcare *** applications have several issues related to developing,planning,and managing the ***,IoT is transforming into G-IoT(Green Internet of Things),which realizes energy *** provides high power efficiency,enhances communication and ***,this paradigm did not resolve all smart applications’challenges in edge infrastructure,such as communication bandwidth,centralization,security,and *** this paper,we propose the OTS Scheme based Secure Architecture for Energy-Efficient IoT in Edge Infrastructure to resolve these *** OTS-based Blockchain-enabled distributed network is used at the fog layer for security and *** evaluated our proposed architecture’s performance quantitatively as well as security and *** conducted a comparative analysis with existing studies with different measures,including computing cost time and communication *** a result of the evaluation,our proposed architecture showed better performance.

关键词： Blockchain energy-efficient IoT ots scheme edge infrastructure security and privacy

Morphological phylogeny among 15 accessions of bamboos growing in Kokrajhar district of the Bodoland Territorial Area Districts,Assam

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Journal of Forestry Research 2018年第5期29卷 1379-1386页

作者： Anusriti Basumatary sushil kumar Middha Talambedu Usha Samik Bhattacharya Birendra kumar Brahma Arvind kumar Goyal Centre for Bamboo Studies and Department of Biotechnology Bodoland University DBT-BIF Centre Department of BiotechnologyPG Research CentreMaharani Lakshmi Ammanni College for Women Department of Biochemistry Maharani Lakshmi Ammanni College for Women Department of Molecular Ecology Max Planck Institute of Chemical Ecology

Bamboo is nature＇s wonderful gift historically associated with the rural population of the Bodoland Territorial Area ***,indiscriminate use of the resource and the ambiguity in the identification of bamboos in the absence of flowering characters pose a potential risk to the bamboo ***,we considered revising the taxonomic positions and phylogenetic relationships among 15 tropical bamboo species using 35 key morphological descriptors（MD） to assess the reliability of vegetative characters in identifying *** phylogenetic tree constructed from the similarity matrix,derived from an unweighted pair group method of analysis（UPGMA） of the 35 MDs,marginally deviated from the conventional taxonomic positions of the bamboo *** the two varieties,one forma of Bambusa vulgaris（***,***,***） and two species of the genus Dendrocalamus（*** and ***）clustered together in a single clade,and *** was distantly placed from their *** discrepancy with the conventional classification might have ensued since only vegetative characters such as culm anatomy,culm sheath,leaf,and leaf sheath were considered in the present *** the phylogenetic relationship among the 15 tropical bamboos（computed from exhaustive MDs）grossly corroborate the conventional taxonomic grouping,a molecular-marker-based multidisciplinary approach should resolve the remaining conflicts in bamboo identification.

关键词： Bamboo Bodoland Culm Culm-sheath Leaf-sheath Phylogenetic relationship conflict

Quantum cascade lasers operating from 1.4 to 4 THz

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Chinese Optics Letters 2011年第11期9卷 9-15页

作者： sushil kumar Department of Electrical and Computer Engineering and Center for Optical Technologies Lehigh University

The development of teranertz （THz） quantum cascade lasers （QCLs） has progressed considerably since their advent almost a decade *** QCLs operating in a frequency range from 1.4 to 4 THz with electron-phonon scattering mediated depopulation schemes are *** different types of GaAs/AlGaAs superlattice designs are *** of the best temperature performances are obtained by the so-called resonant-phonon designs that are *** above a temperature of 160 K has been obtained across the spectrum for THz QCLs operating at ν 〉 1.8 *** maximum operating temperature of previously reported THz QCLs has empirically been limited to a value of ～ω/k B.A new design scheme for THz QCLs with scattering-assisted injection is shown to surpass this empirical temperature barrier,and is promising to improve the maximum operating temperatures of THz QCLs even further.

关键词： Quantum cascade lasers operating from 1.4 to 4 THz QCL

Performance Estimation of Machine Learning Algorithms in the Factor Analysis of COVID-19 Dataset

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Computers, Materials & Continua 2021年第2期66卷 1921-1936页

作者： Ashutosh kumar Dubey sushil Narang Abhishek kumar Satya Murthy Sasubilli Vicente García-Díaz Chitkara University Institute of Engineering and Technology Chitkara UniversityPunjabIndia Workday Integration Architect Huntington ColumbusOHUSA Department of Computer Science University of OviedoOviedoSpain

Novel Coronavirus Disease(COVID-19)is a communicable disease that originated during December 2019,when China officially informed the World Health Organization(WHO)regarding the constellation of cases of the disease in the city of ***,the disease started spreading to the rest of the *** this point in time,no specific vaccine or medicine is available for the prevention and cure of the *** research works are being carried out in the fields of medicinal and pharmaceutical sciences aided by data analytics and machine learning in the direction of treatment and early detection of this viral *** present report describes the use of machine learning algorithms[Linear and Logistic Regression,Decision Tree(DT),K-Nearest Neighbor(KNN),Support Vector Machine(SVM),and SVM with Grid Search]for the prediction and classification in relation to *** data used for experimentation was the COVID-19 dataset acquired from the Center for Systems Science and Engineering(CSSE),Johns Hopkins University(JHU).The assimilated results indicated that the risk period for the patients is 12–14 days,beyond which the probability of survival of the patient may *** addition,it was also indicated that the probability of death in COVID cases increases with *** death probability was found to be higher in males as compared to *** with Grid search methods demonstrated the highest accuracy of approximately 95%,followed by the decision tree algorithm with an accuracy of approximately 94%.The present study and analysis pave a way in the direction of attribute correlation,estimation of survival days,and the prediction of death *** findings of the present study clearly indicate that machine learning algorithms have strong capabilities of prediction and classification in relation to COVID-19 as well.

关键词： COVID-19 linear and logistic regression DT KNN SVM SVMwith grid search