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Geochemical and petrological studies of high sulfur coal and overburden from Makum coalfield (Northeast India) towards understanding and mitigation of acid mine drainage

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International Journal of Coal Science & Technology 2024年第1期11卷 133-147页

作者： Angana Mahanta Debashis Sarmah Nilotpol Bhuyan Monikankana Saikia Sarat Phukan k.S.V.Subramanyam ajit Singh Prasenjit Saikia Binoy k.Saikia Coal and Energy Division CSIR-North East Institute of Science and TechnologyJorhatAssam785006India Academy of Scientific&Innovative Research(AcSIR) Ghaziabad201002India Department of Geological Sciences Gauhati UniversityGuwahatiAssam781014India Geochemistry Division CSIR-National Geophysical Research InstituteUppal RoadHyderabad500007India

Opencast coal mining produces trash of soil and rock containing various minerals,that are usually dumped nearby the abandoned sites which causes severe environmental concern including the production of acid mine drainage(AMD)through oxidation pyrite *** current study entailed assessing the potential production of AMD from an opencast coal mining region in Northeast part of *** order to have a comprehensive overview of the AMD problem in Makum coalfield,the physico-chemical,geochemical,and petrological characteristics of the coal and overburden(OB)samples collected from the Makum coalfield(Northeast India)were thoroughly *** maceral compositions reveal that coal features all three groups of macerals(liptinite,vitrinite,and inertinite),with a high concentration of liptinite indicating the coal of perhydrous,thereby rendering it more ***(FeS_(2))oxidation kinetics were studied by conducting the aqueous leaching experiments of coal and(OB)samples to interpret the chemical weathering under controlled laboratory conditions of various temperature and time periods,and to replicate the actual mine site *** coupled plasma-optical emission spectroscopy(ICP-OES)was operated to detect the disposal of some precarious elements from coal and OB samples to the leachates during our controlled leaching *** Rare earth element(REE)enrichment in the samples shows the anthropogenic incorporation of the REE in the coal and *** experiments reveal the change in conductivity,acid producing tendency,total dissolved solid(TDS),total Iron(Fe)and dissolved Sulfate(SO_(4)^(2−))ions on progress of the leaching ***,the discharge of FeS_(2) via atmospheric oxidation in laboratory condition undergoes a significant growth with the rise of temperature of the reaction systems in the environment and follows pseudo first order kinetics.A bio-remediative strategies is also reported in this paper to mitigate AMD water by

关键词： Opencast mining Pyrite oxidation Coal geochemistry Coal petrology Rare earth elements AMD remediation

Charge transfer of carbon nanomaterials for efficient metal‐free electrocatalysis

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Interdisciplinary Materials 2022年第1期1卷 28-50页

作者： Rajib Paul Qingfeng Zhai ajit k.Roy Liming Dai Department of Macromolecular Science and Engineering Case School of EngineeringCase Western Reserve UniversityClevelandOhioUSA Australian Carbon Materials Centre(A-CMC) School of Chemical EngineeringUniversity of New South WalesSydneyNew South WalesAustralia Materials and Manufacturing Directorate Air Force Research LaboratoryDaytonOhioUSA

Recently,carbon-based metal-free electrocatalysts(C‐MFECs)have drawn considerable research attention because of their attractive physicochemical characteristics,cost-effectiveness,and ability to convert and store energy *** intramolecular charge transfer among different parts of the carbon electrocatalyst and/or intermolecular charge transfer between elec-trocatalyst and electrolyte dictate the ultimate energy conversion *** results and theoretical analyses have demonstrated that rational design of metal-free carbon nanomaterials,coupled with proper in-tramolecular charge transfer through heteroatom doping,incorporation of Stone-Wales defects,and/or intermolecular charge transfer through adsorp-tion of appropriate molecules/moieties,can promote efficient *** this article,we will first provide the related theoretical principles and then present an overview on the rational design and development of C-MFECs for efficient charge transfer,followed by elucidating charge-transfer processes for different electrocatalytic reactions related to renewable energy conversion and environmental remediation ***,the current challenges and future perspectives in this exciting field will be discussed.

关键词： carbon catalyst charge transfer defect doping

Clinical outcomes and gut microbiota analysis of severe alcohol-associated hepatitis patients undergoing healthy donor fecal transplant or pentoxifylline therapy:single-center experience from kerala

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Gastroenterology Report 2022年第1期10卷 566-574页

作者： Cyriac Abby Philips Rizwan Ahamed Sasidharan Rajesh Shobhit Singh ajit Tharakan Jinsha k.Abduljaleel Philip Augustine Clinical and Translational Hepatology The Liver InstituteCenter of Excellence in GI SciencesRajagiri HospitalChunangamvelyAluvaErnakulamKeralaIndia Monarch Liver Laboratory The Liver InstituteCenter of Excellence in GI SciencesRajagiri HospitalChunangamvelyAluvaErnakulamKeralaIndia Department of Gastroenterology and Advanced GI Endoscopy Center of Excellence in GI SciencesRajagiri HospitalChunangamvelyAluvaErnakulamKeralaIndia Diagnostic and Interventional Radiology Center of Excellence in GI SciencesRajagiri HospitalChunangamvelyAluvaErnakulamKeralaIndia

Background Severe alcohol-associated hepatitis(SAH)patients with infections have a high short-term mortality *** microbiota dysbiosis plays an important role in the pathogenesis of *** studies have demonstrated long-term benefits with healthy donor fecal microbiota transplantation(FMT).Data on FMT compared with pentoxifylline for SAH and relevant gut microbial changes are lacking in *** From January 2019 to February 2021,retrospective analysis of a single hospital’s records revealed 47 SAH patients undergoing FMT(100mL/day via nasoduodenal tube for 7days)and 25matched patients receiving pentoxifylline(400mg/8 h for 28days).The primary end point was a 6-month survival *** end points included incidence of ascites,hepatic encephalopathy,infections,acute kidney injury,and gutmicrobiota changes between post-therapy *** discovery and network analysis were also performed to identify significant taxa of gutmicrobiota in post-treatment groups in retrospectively stored stool *** All were *** 6-month survival rate was higher in the patients undergoing FMT than in patients receiving pentoxifylline(83.0%vs 56.0%,P=0.012).At the end of 6-month follow-up,the incidences of clinically significant ascites(56.0%vs 25.5%,P=0.011),hepatic encephalopathy(40.0%vs 10.6%,P=0.003),and critical infections(52.0%vs 14.9%,Pker analysis revealed a significant abundance of Bifidobacterium and Eggerthella in the FMT group and the pentoxifylline group,*** 6 months,Bifidobacterium in the FMT group and pathogenic Aerococcaceae in the pentoxifylline group were *** analysis showed beneficial taxa(Bifidobacterium)as a central influencer in those undergoing FMT at 6 *** Healthy donor FMT improved survival rate and reduced liver-related complications compared with pe

关键词： fecal microbiota stool transplant alcoholic hepatitis liver transplant dysbiosis

Nitrate removal from groundwater using chemically modified coconut husk based granular activated carbon:characterization of the adsorbent,kinetics and mechanism

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Systems Microbiology and Biomanufacturing 2023年第2期3卷 370-383页

作者： Solomon k.M.Huno Jewel Das Eric Dvan Hullebusch ajit P.Annachhatre Eldon R.Rene Pollution Prevention and Resource Recovery Chair Group Department of Water SupplySanitation and Environmental EngineeringIHE Delft Institute of Water EducationP.O.Box 30152601 DA DelftThe Netherlands Environmental Engineering and Management Department of EnvironmentEnergy and Climate ChangeSchool of EnvironmentResource and DevelopmentAsian Institute of Technology58 Moo 9Km.42Paholyothin HighwayP.O.Box 4Klong Luang 12120Pathum ThaniThailand National University of Ireland Galway University RoadGalway H91 TK33Ireland Bangladesh Council of Scientific and Industrial Research(BCSIR) BCSIR Laboratories ChattogramChattogram 4220Bangladesh Universite Paris Cite Institut de Physique du Globe de ParisCNRSF‑75005 ParisFrance School of Engineering Indian Institute of Technology MandiA4‑209MandiHimachal Pradesh 175001India

In this study,a highly porous chemically activated granular activated carbon(GAC)was prepared from coconut husk and tested as an adsorbent to remove nitrate from contaminated *** prepared GAC was characterized by Fouriertransform infrared spectroscopy(FTIR),thermogravimetric and differential thermal analysis(TGA/DTA),scanning electron microscopy(SEM)and the Brunauer-Emmett-Teller(BET)surface area(SBET)*** effects of various process parameters such as initial nitrate concentration,contact time and adsorbent dose on nitrate removal efficiency(response)by the modified GAC were investigated using the statistically significant response surface methodology and Box-Behnken design of *** experimental data were fitted to well-known adsorption isotherms and kinetic models to ascertain the mechanism of the adsorption *** of variance(ANOVA)was performed to determine the significance of the individual and the interactive effects of process variables on the *** BET surface area(SBET)and micropore volume of the prepared GAC from coconut husk was 1120 m^(2)/g and 0.392 cm^(3)/g,*** experimental results showed that physisorption was the main adsorption mechanism governing the process,while the rate of adsorption was limited at initial nitrate concentrations>10 mg/*** Langmuir mono-layer adsorption isotherm best fitted the experimental data with a maximum adsorption capacity of 6.0±1.3 mg/g(~92.5%)with an adsorbent dose of 0.1 g/50 mL,an equilibrium time of 6 h at 28±2℃,and at pH 7.6(±0.2).Among the tested process variables,the adsorbent dose and initial nitrate concentration showed significant effects on the nitrate removal efficiency.

关键词： Nitrate adsorption Groundwater Granular activated carbon Response surface methodology(RSM) Box-Behnken Coconut Husk

Variability in physical properties of plantation-grown progenies of Melia composita and determination of a kiln-drying schedule

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Journal of Forestry Research 2018年第5期29卷 1435-1442页

作者： Shailendra kumar Bhushan U.kelkar ajit k.Mishra Susanta k.Jena Forest Products Division Forest Research Institute

Plantation-grown progenies of Melia composita *** studied for variability in several physical properties： density,radial and tangential shrinkage,longitudinal permeability of heartwood and ***,flat-sawn planks from each of the progeny were subjected to a quick-drying test for determination of kilndrying *** mean density of the species was 0.39 g cm^（-3） and the wood may be categorized as light *** radial shrinkage（%） for the species was 2.8% with progeny-wise variation in radial shrinkage from 1.56 to 4.11%.Mean tangential shrinkage（%） for the species was 5.54% with progeny-wise variation in tangential shrinkage from 3.69 to 7.71%.The resultant tangentialradial shrinkage ratio was 1.98（less than two）,which suggests that the wood is relatively stable with respect to drying *** sapwood and heartwood longitudinal permeability of the species were 3.38 and 2.02 Darcy,*** longitudinal permeability of sapwood and heartwood indicate better drying and preservative properties of the *** quick-drying test method suggests that the species is less susceptible to drying *** the test,only moderate checks and cracks were observed.A tentative kiln-drying schedule was recommended based on these results.

关键词： Melia composita Willd. Density Radial and tangential shrinkage Longitudinal permeability Quickdrying test kiln-drying schedule

Exploring potentialities of avian genomic research in Nepalese Himalayas

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Avian Research 2021年第4期12卷 727-738页

作者： Prashant Ghimire Nishma Dahal ajit kkarna Surendra karki Sangeet Lamichhaney Department of Biological Sciences Kent State UniversityKentOHUSA Biotechnology Division CSIR-Institute of Himalayan Bioresource TechnologyPalampurHPIndia Center for Health and Disease Studies-Nepal KathmanduNepal Institute of Agriculture and Animal Sciences Tribhuvan UniversityKathmanduNepal Emergency Centre for Transboundary Animal Diseases Food&Agricultural Organization of the UNKathmanduNepal School of Bio-medical Sciences Kent State UniversityKentOHUSA

Nepal,a small landlocked country in South Asia,holds about 800 km of Himalayan Mountain range including the Earth's highest *** such a mountain range in the north and plain lowlands in the south,Nepal provides a habitat for about 9%of global avian ***,this diversity is underrated because of the lack of enough studies,especially using molecular tools to quantify an-d understand the distribution patterns of *** this study,we reviewed the studies in the last two decades(20002019)that used molecular methods to study the biodiversity in Nepal to examine the ongoing research trend and *** Nepalese Himalaya has many opportunities for cutting-edge molecular research,our results indicated that the rate of genetic/genomic studies is much slower compared to the regional *** found that genetic research in Nepal heavily relies on resources from international institutes and that too is mostly limited to research on species monitoring,distribution,and taxonomic *** infrastructures to carry out cutting-edge genomic research in Nepal are still in their infancy and there is a strong need for support from national/international scientists,universities,and governmental agencies to expand such genomic infrastructures in *** particularly highlight avian fauna as a potential future study system in this region that can be an excellent resource to explore key biological questions such as understanding eco-physiology and molecular basis of organismal persistence to changing environment,evolutionary processes underlying divergence and speciation,or mechanisms of endemism and restrictive distribution of species.

关键词： Avian fauna Evolutionary Process Genomics Himalayas Nepal

The lattice Boltzmann Peierls Callaway equation for mesoscopic thermal transport modeling

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International Journal of Smart and Nano Materials 2012年第1期3卷 47-63页

作者： Jonghoon Lee Sangwook Sihn ajit k.Roy Barry L.Farmer Thermal Sciences and Materials Branch Materials and Manufacturing DirectorateAir Force Research LaboratoryWright Patterson Air Force BaseOhio 45433USA Universal Technology Corporation 1270 N.Fairfield Rd.DaytonOH 45432USA University of Dayton Research Institute 300 College ParkDaytonOhio 45469USA Materials and Manufacturing Directorate Air Force Research LaboratoryWright Patterson Air Force BaseOhio 45433USA

The lattice Boltzmann Peierls Callaway(LBPC)method is a recent development of the versatile lattice Boltzmann formalism aimed at a numerical experiment on mesoscale thermal transport in a multiphase phonon *** aspects of mesoscopic thermal trans-port are discussed:the finite phonon mean free path and the interface thermal *** on the phonon momentum screening length measured in the LBPC computa-tional apparatus,the validity of the Umklapp collision relaxation time in the Callaway collision operator is examined *** discrete nature of the spatio-temporal domain in the LBPC method,along with the linear approximation of the exponential screening mechanism in the Callaway operator,reveals a large discrepancy between the effective phonon mean free path and the analytic phonon mean free path when the relaxation time is *** link bounce back interface phonon collision rule is used to realize the interface thermal resistance between phonon gases with dissimilar dispersion *** with the Callaway collision operator for the bulk phonon dynam-ics,the interface phonon collision process is regarded as a linear relaxation mechanism toward the local pseudo-equilibrium phonon distribution uniquely defined by the energy conservation *** interface thermal resistance is linearly proportional to the relaxation time of the proposed phonon interface collision rule.

关键词： lattice Boltzmann method link bounce back collision rule Boltzmann Peierls equation phonon hydrodynamics kapitza length interfacial thermal resistance

Graphene-based flexible and wearable electronics

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Journal of Semiconductors 2018年第1期39卷 86-104页

作者： Tanmoy Das Bhupendra k.Sharma ajit k.katiyar Jong-Hyun Ahn School of Electrical and Electronic Engineering Yonsei University

Graphene with an exceptional combination of electronic, optical and outstanding mechanical features has been proved to lead a completely different kind of 2-D electronics. The most exciting feature of graphene is its ultra-thin thickness, that can be conformally contacted to any kind of rough surface without losing much of its transparency and conductivity. Graphene has been explored demonstrating various prototype flexible electronic applications, however, its potentiality has been proven wherever transparent conductive electrodes（TCEs） are needed in a flexible, stretchable format. Graphene-based TCEs in flexible electronic applications showed greatly superior performance over their conventionally available competitor indium tin oxide（ITO）. Moreover, enormous applications have been emerging, especially in wearable devices that can be potentially used in our daily life as well as in biomedical areas. However, the production of high-quality, defect-free large area graphene is still a challenge and the main hurdle in the commercialization of flexible and wearable products. The objective of the present review paper is to summarize the progress made so far in graphene-based flexible and wearable applications. The current developments including challenges and future perspectives arc also highlighted.

关键词： graphene flexible electronics wearable electronics transparent conductive electrode

Statistical Modeling Studies of Iron Recovery from Red Mud Using Thermal Plasma

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Plasma Science and Technology 2013年第5期15卷 459-464页

作者： Swagat S. RATH Archana PANY k. JAYASANkAR ajit k. MITRA C. SATISH kUMAR Partha S. MUkHERJEE Barada k. MISHRA Institute of Minerals and Materials Technology (CSIR) Vedanta Alumina Limited Lanjigarh

Optimization studies of plasma smelting of red mud were carried out. Reduction of the dried red mud fines was done in an extended arc plasma reactor to recover the pig iron. Lime grit and low ash metallurgical （LAM） coke were used as the flux and reductant, respectively. 2level factorial design was used to study the influence of all parameters on the responses. Response surface modeling was done with the data obtained from statistically designed experiments. Metal recovery at optimum parameters was found to be 79.52%.

关键词： plasma response surface modeling red mud design of experiments optimiza-tion