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Journal of Materials Science & Technology 2021年第25期84卷 159-172页

作者： Santanu Mandal Vijay Kishore Madhuparna Bose samit kumar nandi Mangal Ro Department of Metallurgical and Materials Engineering Indian Institute of Technology-KharagpurKharagpur 721302India Department of Veterinary Surgery&Radiology West Bengal University of Animal&Fishery SciencesKolkata 700037India Department of Biotechnology Indian Institute of TechnologyKharagpur 721302India

In recent years,iron(Fe)based degradable metal is explored as an alternative to permanent fracture fixation *** the present work,copper(Cu)is added in Fe-Mn system to enhance the degradation rate and antimicrobial ***-Mn-x Cu(x=0.9,5 and 10 wt.%)alloys are prepared by the meltingcasting-forging *** analysis confirms austenite phase stabilization due to the presence of Mn and *** predicted by Thermo-Calc calculations,Cu rich phase precipitations are noticed along the austenite grain *** behaviours of Cu added Fe-Mn alloys are investigated through static immersion and electrochemical polarization where enhanced degradation is found for higher Cu added *** challenged against *** bacteria,the Fe-Mn-Cu alloy media extract shows a significant bactericidal effect compare to the base *** vitro cytocompatibility studies,as determined using MG63 and MC3T3-E1 cell lines,indicate increased cell density as a function of time for all the *** implanted in rabbit femur,the newly developed alloy does not show any kind of tissue necrosis around the *** osteogenesis and higher new bone formation are observed with Fe-Mn-10 Cu alloy as evident from micro-computed tomography(μ-CT)and fluorochrome labelling.

关键词： Iron-manganese alloy Degradable metal In vitro Micro-CT

Polymeric biomaterials-based tissue engineering for wound healing: a systemic review

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Burns & Trauma 2023年第1期11卷 122-145页

作者： Pratik Das Suvendu Manna Shivam Roy samit K.nandi Piyali Basak School of Bioscience and Engineering Jadavpur University188Raja Subodh Chandra Mallick RdJadavpurKolkata 700032West BengalIndia Sustainability Cluster University of Petroleum and Energy StudiesDehradun 248007UttarakhandIndia Department of Veterinary Surgery and Radiology West Bengal University of Animal and Fishery SciencesBelgachiaKolkata 700037West BengalIndia

Background:Biomaterials are vital products used in clinical sectors as alternatives to several biological macromolecules for tissue engineering techniques owing to their numerous beneficial properties,including wound *** healing pattern generally depends upon the type of wounds,and restoration of the skin on damaged areas is greatly dependent on the depth and severity of the *** rate of wound healing relies on the type of biomaterials being incorporated for the fabrication of skin substitutes and their stability in in vivo *** this review,a systematic literature search was performed on several databases to identify the most frequently used biomaterials for the development of successful wound healing agents against skin damage,along with their mechanisms of ***:The relevant research articles of the last 5 years were identified,analysed and reviewed in this *** meta-analysis was carried out using PRISMA and the search was conducted in major scientific *** research of the most recent 5 years,from 2017-2021 was taken into *** collected research papers were inspected thoroughly for further *** advances in the utilization of natural and synthetic biomaterials(alone/in combination)to speed up the regeneration rate of injured cells in skin wounds were ***,23 papers were critically reviewed and ***:In total,2022 scholarly articles were retrieved from databases utilizing the aforementioned input *** eliminating duplicates and articles published before 2017,∼520 articles remained that were relevant to the topic at hand(biomaterials for wound healing)and could be evaluated for *** different procedures,23 publications were selected as best fitting for data *** Reporting Items for Systematic Reviews and Meta-Analyses for this review illustrates the selection criteria,such as exclusion and inclusion *** 23 recent publications

关键词： Wound healing Biomaterials Tissue engineering Skin regeneration Polymers

Voltage-controlled NiO/ZnO p–n heterojunction diode: a new approach towards selective VOC sensing

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Microsystems & Nanoengineering 2020年第1期6卷 894-902页

作者： Sayan Dey Swati Nag Sumita Santra samit kumar Ray Prasanta kumar Guha Department of Electronics&Electrical Communication Engineering Indian Institute of TechnologyKharagpur 721302India Department of Electrical Engineering National Institute of TechnologyAgartala 99046India Department of Physics Indian Institute of TechnologyKharagpur 721302India Department of Physics Belda CollegeBelda 721424India S N Bose National Centre for Basic Sciences Kolkata 700106India

Metal oxide resistive gas sensors suffer from poor selectivity that restricts their practical *** sensor arrays are used to improve selectivity which increased the system ***,we have proposed a novel NiO/ZnO-based p–n junction single-diode device for selective sensing of several volatile organic compounds(VOCs)simultaneously by tuning bias *** operating voltage was varied between 3 and 5 volts to achieve selective sensing of 2-propanol(19.1 times for 95ppm with response and recovery times of 70 s and 55s respectively‚at 3 volts),toluene(20.1 times for 95 ppm with response and recovery times of 100 s and 60 s respectively,at 4 volts),and formaldehyde(11.2 times for 95 ppm with response and recovery times of 88 s and 54s respectively,at 5 volts).A probable mechanism of the tunable selectivity with operating bias voltage due to increase in surface carriers with increasing voltage was hence put ***,this device may play an important role to develop future selective multiple VOC sensor thereby replacing standard sensor arrays.

关键词： selectivity hence thereby

Combustion characteristics of high ash Indian thermal,heat affected coal and their blends

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International Journal of Coal Science & Technology 2021年第5期8卷 1078-1087页

作者： Subhajit Aich Barun kumar nandi Sumantra Bhattacharya Department of Fuel Minerals and Metallurgical Engineering Indian Institute of Technology(Indian School of Mines)Dhanbad 826004JharkhandIndia

Onsite mine fire generates large volumes of heat-affected coal in Jharia coalfields,*** utilization of such heat-affected coal in thermal utilities is not feasible as such coal does not have the desirable volatile matter required for *** the present work,experimental studies have been carried out to investigate the possible utilization of such heat-affected coal in thermal utilities by blending with other ***-affected coal(31%ash and 5300 kcal/kg GCV)collected from Jharia coalfield were blended with thermal coal(28%ash and 5650 kcal/kg GCV)in different ratios of 90:10,80:20,70:30 and 60:40 to identify the desirable blend ratio for burning of blended coal in thermal *** characteristics of all the coals were carried out using *** combustion parameters such as ignition temperature,peak temperature,burnout temperature,ignition index,burnout index,combustion performance index,rate and heat intensity index of the combustion process and activation energy were evaluated to analyse the combustion *** and theoretical analysis shows the blend ratio of 90:10 can be used in place of only thermal coal in utilities to reduce the fuel cost.

关键词： Coal blends Heat affected coal Combustion indices TGA-DTG Burning profile Mass gain analysis

Electric discharge phenomenon in dielectric and electrolyte medium

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Advances in Manufacturing 2018年第4期6卷 457-464页

作者： Mukesh kumar Sindhu Debasish nandi Indrajit Basak Department of Mechanical Engineering. NIT Durgapur. Durgapur 713209. India Department of Mechanical Engineering JIS College of Engineering Kalyani 741235 India

Electric discharge is a common tool nowadays for machining of materials. It may be through a liquid medium or through air. Any metals, hard alloys, and nonmetals can be machined using the energy of electric discharge. In electric discharge machining (EDM), the discharge occurs between two electrodes through a liquid medium and it is applicable only for electrically con ducting materials and alloys. In electrochemical discharge machining (ECDM), the medium is an aqueous electrolyte and it is of two types. In the first type, the discharge occurs between two electrodes. One of the electrodes is the workpiece, and the other is the tool. In the second type, the discharge occurs between one electrode and an electrolyte. It is used for electrically nonconducting materials and the discharge energy is utilized maintaining the nonconducting workpiece in proximity of the discharge. All these electrical discharges are transient phenomena and do not result in a stable discharge in the form of arc. The output parameters depend on the discharge energy that requires precise control to maintain the accuracy of the machining. For micromachining, the control of the discharge is paramount both in terms of energy and pattern. Using various shaped tools, machining media with additives, different types of applied potentials, and supporting mechanical motions are some of the attempts made to improve the machining output. Optimization of these parameters for machining particular materials (or alloys) is a popular field of research. The present work is directed toward the investigation of discharge initiation and development by analyzing the cell current and discharge voltage relationship for both EDM and ECDM. The rectangular direct current (DC) pulse with different frequencies and the duty factor (on-off time ratio) are used for investigation. Observations on the voltage-current relationship are made for the external potential prior to discharge at discharge and above the discharge potenti

关键词： Electric discharge Electric discharge machining (EDM) Electrochemical discharge machining (ECDM) Pulsed direct current (DC) Duty factor

In-Situ Hydrothermal Synthesis of Bi–Bi2O2CO3 Heterojunction Photocatalyst with Enhanced Visible Light Photocatalytic Activity

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Nano-Micro Letters 2017年第2期9卷 58-67页

作者： Prasenjit Kar Tuhin kumar Maji Ramesh nandi Peter Lemmens Samir kumar Pal Department of Chemical Biological and Macromolecular Sciences S.N.Bose National Centre for Basic SciencesBlock JDSector ⅢSaltLakeKolkata 700106India Institute for Condensed Matter Physics TU BraunschweigMendelssohnstraße 338106 BrunswickGermany Laboratory for Emerging Nanometrology TU BraunschweigBrunswickGermany

Bismuth containing nanomaterials recently received increasing attention with respect to environmental applications because of their low cost, high stability and nontoxicity. In this work, Bi–Bi_2O_2CO_3 heterojunctions were fabricated by in-situ decoration of Bi nanoparticles on Bi_2O_2CO_3 nanosheets via a simple hydrothermal synthesis approach. X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM) and high-resolution TEM(HRTEM) were used to confirm the morphology of the nanosheet-like heterostructure of the Bi–Bi_2O_2CO_3 composite. Detailed ultrafast electronic spectroscopy reveals that the in-situ decoration of Bi nanoparticles on Bi_2O_2CO_3 nanosheets exhibit a dramatically enhanced electron-hole pair separation rate, which results in an extraordinarily high photocatalytic activity for the degradation of a model organic dye, methylene blue(MB) under visible light illumination. Cycling experiments revealed a good photochemical stability of the Bi–Bi_2O_2CO_3 heterojunction under repeated irradiation. Photocurrent measurements further indicated that the heterojunction incredibly enhanced the charge generation and suppressed the charge recombination of photogenerated electron-hole pairs.

关键词： Bi nanoparticles Bi–Bi2O2CO3 nanosheets Heterojunction Hydrothermal method Charge separation Visible light photocatalytic activity

Effect of weathering on physico-chemical properties and combustion behavior of an Indian thermal coal

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International Journal of Coal Science & Technology 2019年第1期6卷 51-62页

作者： Subhajit Aich Barun kumar nandi Sumantra Bhattacharya Department of Fuel and Mineral Engineering Indian Institute of Technology (Indian School of Mines)Dhanbad Dhanbad Jharkhand 826004India

An open air stockpile of conical shape was formed with 3.5 m base diameter and 5 m height using 500 tons of -200 mm size ROM thermal coal on a concrete floor. Coal sample from the stockpile were collected at 30 days interval for analysis of various chemical properties like;proximate analysis, ultimate analysis, gross calorific value (GCV) and various combustion related properties such as ignition temperature, peak temperature, burnout temperature, maximum combustion rate, ignition index, burnout index, combustion performance index and combustion rate intensity index. Experimental results show that, due to weathering of coal fixed carbon decreased from 35.6% to 19.9%, elemental carb on (C) decreased from 46.6% to 28.6%, hydrogen (H) decreased from 3.3% to 2.9% and GCV decreased by up to 55% of original value during 330 days of storage of coal in an open atmosphere. Ash con tent of coal increased form 29.2% to 46.6% due to loss of combustibles. Sulfur (S) of coal was found to get increased from 0.33% to 1.08% during storage. The activation energy of coal combustion increased from 22 kJ/mol to 54 kJ/mol. Variation in combustion parameters signifies that weathering has significant negative impact on coal combustion properties as coal become difficult to ignite.

关键词： Weathering of coal TGA-DTG Combustibles Coal combustion Activation energy

Relationship between proximate analysis parameters and combustion behaviour of high ash Indian coal

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International Journal of Coal Science & Technology 2020年第4期7卷 766-777页

作者： Subhajit Aich Dibyajyoti Behera Barun kumar nandi Sumantra Bhattacharya Department of Fuel Minerals and Metallurgical Engineering Indian Institute of Technology(Indian School of Mines)DhanbadDhanbadJharkhand 826004India

This work presents the analysis of combustion characteristics of high ash Indian coal(28%-40%)collected from different mines of Singaurali coalfield,*** the coal samples were characterized by proximate and gross calorific value *** performance of the coals were characterised using thermo-gravimetric analysis to identify the burning profile of individual *** combustion kinetic parameters such as ignition temperature,peak temperature and burnout temperature,ignition index and burnout index,combustion performance index plus rate and intensity index of combustion process,activation energy were determined to analyse the combustion behaviour of *** all these combustion properties were compared with the volatile matter,ash,fixed carbon and fuel ratio of each *** analysis shows that with increase in ash content,combustion performance initially increases and later ***,coal with(25±1.75)%volatile matter,20%-35%ash and fuel ratio 1.4-1.5 were found to be optimum for coal combustion.

关键词： TGA-DTG Proximate analysis Combustion kinetics Activation energy Burning profile

Development of a Polyclonal Antibody-based AC-ELISA and Its Comparison with PCR for Diagnosis of Canine Parvovirus Infection

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Virologica Sinica 2010年第5期25卷 352-360页

作者： Manoj kumar Sukdeb nandi Sunil Chidri Virology Laboratory Centre for Animal Disease Research and DiagnosisIndian Veterinary Research Institute

A polyclonal antibody-based antigen-capture ELISA （AC-ELISA） has been developed for detection of Canine parvovirus （CPV） antigens in faecal samples of dogs. The assay uses rabbit anti-CPV polyclonal antibody as the capture antibody, guinea pig anti-CPV polyclonal antibody as tracing antibody and anti-guinea pig HRPO conjugate as the detection system. The optimum dilution of the capture antibody and the tracing antibody capable of detecting the CPV-2 antigens was found to be 1：1 600 and 1：400, respectively, in the check-board titration. In this study, a total of 152 samples （129 faecal samples and 23 cell culture supernatant） were tested both by AC-ELISA and by polymerase chain reaction （PCR）. Of the samples tested, 69 and 78 samples were found positive by AC-ELISA and PCR, respectively. The AC-ELISA had relative sensitivity, relative specificity and accuracy of 88.4%, 100.0% and 91.4% respectively. The analytical sensitivity of AC-ELISA was estimated to be 102.8 TCID50/mL whereas PCR sensitivity was 100.8 TCIDs0/mL. The AC-ELISA is a simple, quick and reliable method for screening large numbers of faecal samples of dogs suspected of CPV infection.

关键词： Canine parvovirus (CPV) Polyclonal antibody Antigen-capture ELISA(AC-ELISA)

Analysis of a fractional-order SIS epidemic model with saturated treatment

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International Journal of Modeling, Simulation, and Scientific Computing 2021年第1期12卷 185-212页

作者： Soovoojeet Jana Manotosh Mandal Swapan kumar nandi T.K.Kar Department of Mathematics Ramsaday College Amta-711401HowrahWest BengalIndia Department of Mathematics Tamralipta Mahavidyalaya Tamluk-721636West BengalIndia Department of Mathematics Nayabasat P.M.Sikshaniketan Paschim Medinipur-721253West BengalIndia Department of Mathematics Indian Institute of Engineering Science and Technology Shibpur Howrah-711103West BengalIndia

In this paper,we propose and analyze a fractional-order SIS epidemic model with the saturated treatment and disease *** existence and uniqueness,nonnegativity and finiteness of solutions for our suggested model have been *** equilibria of the model are found and their local and global stability analyses are also ***,the conditions for fractional backward and fractional Hopf bifurcation are also analyzed in both the commensurate and incommensurate fractional-order *** study how the control parameter and the order of the fractional derivative play role in local as well as global stability of equilibrium points and Hopf *** have demonstrated the analytical results of our proposed model system through several numerical simulations.

关键词： Caputo fractional differentiation SIS epidemic model global asymptotic stability treatment control fractional Hopf bifurcation fractional backward bifurcation