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monolithic metal-based/porous carbon nanocomposites made from dissolved cellulose for use in electrochemical capacitor

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Green Carbon 2024年第1期2卷 109-117页

作者： madhav P.Chavhan Arjeta Kryeziu Somenath ganguly Julien Parmentier University of Ostrava Faculty of Science30.dubna 22Ostrava 70103Czech Republic Universitéde Strasbourg Universitéde Haute-AlsaceInstitut de Science des Matériaux de Mulhouse(IS2M)UMR 7361 CNRS-UHA15 rue Jean StarckyBP 248868057 Mulhouse CedexFrance Indian Institute of Technology Kharagpur Department of Chemical EngineeringKharagpurIndia

Porous metal-based carbon nanocomposites,with a monolithic shape,were prepared by a one-pot synthesis from dissolved cellulose and metallic salts using a simple,cheap,and environmentally friendly *** potential performances as electrochemical capacitors were tested with three metal precursors(m=Cu,mn,and Fe)with two loadings and in an asymmetric cell for the Fe-based carbon ***,here soluble metal precursors were not deposited on a hard cellulose template but mixed in a precooled concentrated NaOH solution where cellulose was previously dissolved,allowing for a good dispersion of the metallic *** a freezing step where concomitant cellulose regeneration and pore ice-templating phenomena took place,followed by a carbonization step,the mixture led to a porous carbon monolith embedding well-dispersed metal-based nanoparticles having a diameter below 20 nm and present as metallic,oxide,or carbide phase(s)according to the element *** materials were characterized by different physicochemical techniques and electrochemical *** performances as supercapacitors are discussed in light of the specific behaviour of the metal-based phase and its influence on the carbon matrix properties such as mesopore formation and carbon *** asymmetric energy storage cell assembled with a Fe-based carbon electrode against a carbon xerogel electrode derived from a phenolic resin shows specific energy and power of 18.3 Wh kg^(−1)at 5 mA cm^(−2)and 1.6 kW kg^(−1)at 25 mA cm^(−2),respectively.

关键词： Cellulose metal-based carbon nanocomposite Nanoparticles monolith Supercapacitor

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Geochemistry and petrogenesis of Rajahmundry trap basalts of Krishna-Godavari Basin,India

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Geoscience Frontiers 2015年第3期6卷 437-451页

作者： C.manikyamba Sohini ganguly m.Santosh Abhishek Saha G.Lakshminarayana CSIR-National Geophysical Research Institute Department of Geology University of Calcutta School of Earth Sciences and Resources China University of Geosciences midwest Group Banjara Hills

The Rajahmundry Trap Basalts （RTB） are erupted through fault-controlled fissures in the Krishna-Godavari Basin （K-G Basin） of Godavari Triple Junction, occurring as a unique outcrop sandwiched between Cretaceous and Tertiary sediments along the east coast of India. Detailed geochemical studies have revealed that RTB are mid-Ti （1.74-1.92） to high-Ti （2.04-2.81） basalts with a distinct quartz tholeiitic parentage. mgO （6.2-13.12 wt.%）, mg# （29-50） and Zr （109-202 ppm） suggest that these basalts evolved by fractional crystallization during the ascent of the parent magma along deep-seated fractures. mod- erate to high fractionation of HREE, as indicated by （Gd/Yb）N ratios （1.71-2.31） of RTB, suggest their generation through 3-5% melting of a Fe-rich mantle corresponding to the stability fields of spinel and garnet peridotite at depths of 60-100 km. Low K2O/P2O5 （0.26-1.26）, high TiO2/P2O5 （6.74-16.79）, La/Nb （0.89-1.45）, Nb/Th 〉 8 （8.35-13）, negative anomalies at Rb reflect minimum contamination by granitic continental crust. （Nb/La）Pm ratios （0.66-1.1） of RTB are attributed to endogenic contamination resulted through recycling of subducted oceanic slab into the mantle. Pronounced Ba enrichment with relative depletion in Rb indicates assimilation of Infra- and Inter-trappean sediments of estuarine to shallow marine character. Geochemical compositions such as A1203/TiO2 （3.88-6.83）, medium to high TiO2 （1.74 -2.81 wt.%）, positive Nb anomalies and LREE enrichment of these RTB attest to their mantle plume origin and indicate the generation of parent magma from a plume-related enriched mantle source with Em 1 signature. Ba/Th （46-247）, Ba/La （3.96-28.51） and Th/Nb （0.08-0.13） ratios suggest that the source enrichment process was marked by recycling of subduction-processed oceanic crust and lithospheric components into the mantle. Zr/Hf （37-41） and Zr/Ba （0.51-3.24） indicate involvement of an asthenospheric mantle source. The Rajahmundry basalts show affinity towards FOZO （

关键词： Rajahmundry Trap Basalts (RTB) Fault-controlled fissures Fractional crystallization Enriched mantle source Plume-lithosphere interaction

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Improvement in hot corrosion resistance of dissimilar alloy 825 and AISI 321 CO2-laser weldment by HVOF coating in aggressive salt environment at 900℃

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International Journal of minerals,metallurgy and materials 2020年第11期27卷 1536-1550页

作者： S.m.muthu m.Arivarasu T.Hari Krishna Supriyo ganguly K.V.Phani Prabhakar Saurav mohanty School of mechanical Engineering Vellore Institute of TechnologyVelloreTamil Nadu 632014India Center for Innovative manufacture Research Vellore Institute of TechnologyVelloreTamil Nadu 632014India Welding Engineering and Laser Processing Centre Cranfield UniversityBedfordUnited Kingdom CLPm International Advanced Research Centre for Powder Metallurgy&New Materials(ARCI)HyderabadIndia Department of mechanical Engineering North Carolina State UniversityRaleighUSA

This study investigated the hot corrosion performance of a dissimilar weldment of Ni-based superalloy and stainless steel joined by CO2-laser welding and improved by high-velocity oxy-fuel(HVOF)coating in a Na2SO4-60wt%V2O5 environment at 900℃.A dissimilar butt joint of AISI 321 and alloy 825 was fabricated by CO2-laser welding with low heat input after obtaining the optimum welding parameters by bead-on-plate *** metallurgical and mechanical properties of the laser weldment were *** tensile test results indicated the occurrence of fracture in the base metal AISI 321 *** HVOF process was employed to coat Ni-20wt%Cr on the *** evaluate the surface morphology of the corrosion products formed on the uncoated and Ni-20wt%Cr-coated weldments,scanning electron microscopy(SEm)analysis was ***-dispersive spectroscopy(EDS)was used to determine the different elements present on the surface *** existence of oxide phases on the weldments was determined by X-ray diffraction(XRD).The cross sections of the weldments were characterized by SEm with EDS line mapping *** results indicated that the Ni-20wt%Cr-coated weldment exhibited superior hot corrosion resistance due to the development of Cr2O3 and NiCr2O4 protective oxide scales.

关键词： nickel-based superalloy dissimilar welding weldment corrosion high-velocity oxy-fuel coating corrosion kinetics

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Impact of open dumping of municipal solid waste on soil properties in mountainous region

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Journal of Rock mechanics and Geotechnical Engineering 2018年第4期10卷 725-739页

作者： Anchal Sharma Ashok Kumar Gupta Rajiv ganguly Department of Civil Engineering Jaypee University of Information Technology

This paper presents the effect of open dumping of municipal solid waste(mSW) on soil characteristics in the mountainous region of Himachal Pradesh, India. The solid waste of dumpsite contains various complex characteristics with organic fractions of the highest proportions. As leachate percolates into the soil, it migrates contaminants into the soil and affects soil stability and strength. The study includes the geotechnical investigation of dump soil characteristics and its comparison with the natural soil samples taken from outside the proximity of dumpsites. The geochemical analysis of dumpsite soil samples was also carried out by scanning electron microscopy(SEm) and energy dispersive X-ray spectroscopy(EDS).Visual inspection revealed that the mSW consists of high fraction of organics, followed by paper. The soil samples were collected from five trial pits in the dumpsites at depths of 0.5 m, 1 m and 1.5 m. Then the collected soil samples were subjected to specific gravity test, grain size analysis, Atterberg’s limit test,compaction test, direct shear test, California bearing ratio(CBR) test and permeability analysis. The study indicated that the dumpsite soils from four study regions show decreasing trends in the values of maximum dry density(mDD), specific gravity, cohesion and CBR, and increasing permeability as compared to the natural soil. The results show that the geotechnical properties of the soils at all four study locations have been severely hampered due to contamination induced by open dumping of waste.

关键词： municipal solid waste (mSW) Physical characterization Soil pollution Open dumping Scanning electron microscopy (SEm) Energy disperse X-ray spectroscopy (EDS)

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Geochemical cycling during subduction initiation:Evidence from serpentinized mantle wedge peridotite in the south Andaman ophiolite suite

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Geoscience Frontiers 2018年第6期9卷 1755-1775页

作者： Abhishek Saha m.Santosh Sohini ganguly C.manikyamba Jyotisankar Ray Jagadish Dutta CSIR-National Institute of Oceanography Dona PaulaGoa 403 004India School of Earth Science and Resources China University of GeosciencesBeijing100083China Department of Earth Sciences University of AdelaideAdelaideSA 5005Australia Department of Earth Science Goa UniversityTaleigao PlateauGoa 403206India CSIR-National Geophysical Research Institute Uppal RoadHyderabad500 007India Department of Geology University of Calcutta35Ballygunge Circular RoadKolkata700 019India

The ophiolite suite from south Andaman Islands forms part of the Tethyan Ophiolite Belt and preserves the remnants of an ideal ophiolite sequence comprising a basal serpentinized and tectonised mantle peridotite followed by ultramafic and mafic cumulate units, basaltic dykes and spilitic pillow basalts interlayered with arkosic wacke. Here, we present new major, trace, rare earth(REE) and platinum group(PGE) element data for serpentinized and metasomatized peridotites(dunites) exposed in south Andaman representing the tectonized mantle section of the ophiolite suite. Geochemical features of the studied rocks, marked by Al_2 O_3/TiO_2 > 23, LILE-LREE enrichment, HFSE depletion, and U-shaped chondrite-normalized REE patterns with(La/Sm)N > 1 and(Gd/Yb)N m boninitic mantle melts. These observations substantiate a subduction initiation process ensued by rapid slab roll-back with extension and seafloor spreading in an intraoceanic fore-arc regime. The boninitic composition of the serpentinized peridotites corroborate fluid and melt interaction with mantle manifested in terms of(i) hydration, metasomatism and serpentinization of depleted, mORB-type, sub-arc wedge mantle residual after repeated melt extraction; and(ii) refertilization of refractory mantle peridotite by boninitic melts derived at the initial stage of intraoceanic subduction. Serpentinized and metasomatized mantle dunites in this study record both mOR and intraoceanic arc signatures collectively suggesting suprasubduction zone affinity. The elevated abundances of Pd(4.4-12.2 ppb) with highΣPPGE/∑IPGE(2-3) and Pd/Ir(2-5.5) ratios are in accordance with extensive melt-rock interaction through percolation of boninitic melts enriched in fluid-fluxed LILE-LREE into the depleted mantle after multiple episodes of melt extraction. The high Pd contents with relatively lower Ir concentrations of the samples are analogous to characteristic PGE signatures of boninitic magmas and might have r

关键词： South Andaman Ophiolite mantle peridotite metasomatism Geochemical cycling Subduction initiation

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measurement of circulating levels of VEGF-A,-C,and -D and their receptors,VEGFR-1 and -2 in gastric adenocarcinoma

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World Journal of Gastroenterology 2008年第24期14卷 3879-3883页

作者： mansour S Al-moundhri A Al-Shukaili m Al-Nabhani B Al-Bahrani IA Burney A Rizivi SS ganguly medical Oncology Unit Department of MedicineCollege of Medicine and Health SciencesSultan Qaboos University Department of microbiology and Immunology (SQU) National Cancer Institute Royal Hospital Department of Epidemiology and medical Statistics (SQU)

AIm: To analyze the serum levels and prognostic significance of vascular endothelial growth factor (VEGF) -A,-C,and -D,and their receptors,VEGFR-1 and -2 in gastric adenocarcinomas. mETHODS: The serum levels of VEGF family members were measured in 76 control subjects and 76 patients with gastric adenocarcinoma using an enzyme-linked immunosorbent assay (ELISA). These measurements were correlated with clinco-pathological features and survival rates. RESULTS: The serum levels of VEGF-A and its receptor,VEGFR-1,were signifi cantly higher in patients with gastric cancer than in healthy donors (t = 2.3,P = 0.02 and t = 4.2,P m levels of VEGF-D were signif icantly higher in control subjects than in patients (t = 2.9,P = 0.004). There was no significant difference in serum levels of VEGF-C and VEGFR-2 between patients and controls. VEGF-C was associated with advanced tumor stage and presence of metastasis. VEGFR-1 was associated with metastasis,advanced overall stage,tumor differentiation and survival. VEGFR-2 levels were associated with poor tumor differentiation. There was no significant prognostic value for any of the VEGF family members or their receptors except for VEGFR-1 where high levels were associated with a poor overall survival. CONCLUSION: Serum VEGF levels vary significantly in the same cohort of patients with variable clinico-pathological features and prognostic values. The simultaneous measurement of VEGF receptors levels in sera may overcome the limitations of a single biomarker assay.

关键词： Gastric cancer Serum Vascular endothelialgrowth factor Oman

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Droplet orthogonal impact on nonuniform wettability surfaces

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液滴(英文) 2023年第3期2卷 68-78页

作者： Shashwata moitra mohamed Elsharkawy Antonio Russo Sreya Sarkar Ranjan ganguly Pietro Asinari Constantine m.megaridis Department of mechanical and Industrial Engineering University of Illinois ChicagoChicagoIllinoisUSA Energy Department Politecnico di TorinoTorinoItaly Department of Power Engineering Jadavpur UniversityKolkataWest BengalIndia

The vast majority of prior studies on droplet impact have focused on collisions of liquid droplets with spatially homogeneous(i.e.,uniform-wettability)*** in recent years,there has been growing interest on droplet impact on nonuniform wettability surfaces,which are more relevant in *** paper presents first an experimental study of axisymmetric droplet impact on wettability-patterned *** experiments feature millimeter-sized water droplets impacting centrally with Wemain is less wettable than the inner one).Depending upon the droplet momentum at impact,the experiments reveal the existence of three possible regimes of axisymmetric spreading,namely(I)interior(only within Area 1)spreading,(II)contact-line entrapment at the periphery of Area 1,and(III)exterior(extending into Area 2)*** present an analysis based on energetic principles forθ_(1)θ_(2)(i.e.,the outer domain is more wettable than the inner one).The experimental observations are consistent with the scaling and predictions of the analytical model,thus outlining a strategy for predicting droplet impact behavior for more complex wettability patterns.

关键词： nonuniform outer interior

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Phanerozoic magmatism in the Proterozoic Cuddapah Basin and its connection with the Pangean supercontinent

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Geoscience Frontiers 2019年第6期10卷 2239-2249页

作者： Th.Dhanakumar Singh C.manikyamba Li Tang Sohini ganguly m.Santosh K.S.V.Subramanyam Arubam C.Khelen CSIR-National Geophysical Research Institute(Council of Scientific and Industrial Research) Uppal RoadHyderabad 500007India School of Earth Sciences and Resources China University of Geosciences Beijing29 Xueyuan RoadBeijing 100083China Department of Earth Sciences Goa UniversityTaleigao PlateauGoa 403206India Centre for Tectonics Exploration and ResearchUniversity of AdelaideAdelaideSA 5005Australia Key Lab of Submarine Geosciences and Prospecting Techniques MOE AND College of Marine GeosciencesOcean University of ChinaQingdao 266100China

magmatic pulses in intraplate sedimentary basins are windows to understand the tectonomagmatic evolution and paleaoposition of the *** present study reports the U-Pb zircon ages of mafic flows from the Cuddapah Basin and link these magmatic events with the Pangean evolution during late Carboniferous-Triassic/Phanerozoic *** U-Pb geochronology for the basaltic lava flows from Vempalle Formation,Cuddapah Basin suggests two distinct Phanerozoic magmatic events coinciding with the amalgamation and dispersal stages of Pangea at 300 ma(Late Carboniferous)and 227 ma(Triassic).Further,these flows are characterized by analogous geochemical and geochronological signatures with Phanerozoic counterparts from Siberian,Panjal Traps,Emeishan and Tarim LIPs possibly suggesting their coeval and cogenetic *** the Phanerozoic Eon,the Indian subcontinent including the Cuddapah Basin was juxtaposed with the Pangean LIPs which led to the emplacement of these pulses of magmatism in the Basin coinciding with the assemblage of Pangea and its subsequent breakup between 400 ma and 200 ma.

关键词： Cuddapah Basin mafic flows Zircon U-Pb geochronology Phanerozoic magmatism Pangea supercontinent

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Extensional collapse of the Gondwana orogen: Evidence from Cambrian mafic magmatism in the Trivandrum Block, southern India

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Geoscience Frontiers 2019年第1期10卷 263-284页

作者： Qiong-Yan Yang Sohini ganguly E.Shaji Yunpeng Dong V.Nanda-Kumar School of Earth Science and Resources China University of Geosciences Department of Earth Science Goa University Department of Geology University of Kerala State Key Laboratory of Continental Dynamics Department of Geology Northwest University National Center for Earth Science Studies Akkulam Trivandrum India

The assembly of Late Neoproterozoice Cambrian supercontinent Gondwana involved prolonged subduction and accretion generating arc magmatic and accretionary complexes, culminating in collision and formation of high grade metamorphic orogens. Here we report evidence for mafic magmatism associated with post-collisional extension from a suite of gabbroic rocks in the Trivandrum Block of southern Indian Gondwana fragment. Our petrological and geochemical data on these gabbroic suite show that they are analogous to high Fe tholeiitic basalts with evolution of the parental melts dominantly controlled by fractional crystallization. They display enrichment of LILE and LREE and depletion of HFSE with negative anomalies at Zre Hf and Ti corresponding to subduction zone magmatic regime. The tectonic affinity of the gabbros coupled with their geochemical features endorse a heterogeneous mantle source with collective melt contributions from sub-slab asthenospheric mantle upwelling through slab break-off and arc-related metasomatized mantle wedge, with magma emplacement in subduction to post-collisional intraplate settings. The high Nb contents and positive Nbe Ta anomalies of the rocks are attributed to inflow of asthenospheric melts containing ancient recycled subducted slab components and/or fusion of subducted slab materials owing to upwelling of hot asthenosphere. Zircon grains from the gabbros show magmatic crystallization texture with low U and Pb content. The LA-ICPmS analyses show ^(206) Pb/^(238) U mean ages in the range of 507-494 ma suggesting Cambrian mafic magmatism. The post-collisional mafic magmatism identified in our study provides new insights into mantle dynamics during the waning stage of the birth of a supercontinent.

关键词： mafic dykes Geochemistry Zircon Ue Pb geochronology Post-collisional extension Gondwana supercontinent

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molecular Characterization of Indian Species of Steinernema （Nematoda： Steinernematidae） Based on Restriction Fragment Length Polymorphism Profile of Internal Transcribed Spacer Region of Ribosomal DNA

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Journal of Agricultural Science and Technology(A) 2011年第3X期1卷 368-374页

作者： S. Kumar A. Yadav S. ganguly Division of Nematology Indian Agricultural Research Institute New Delhi 110012 India Department of Biotechnology Kurukshetra University Kurukshetra Haryana136119 India

Restriction fragment length polymorphism （RFLP） profiles of the amplified products of Internal Transcribed Spacer （ITS） region of rDNA using four restriction enzymes （Alul, Rsal, HinfI and HhaI） revealed distinctness of six Indian isolates of Steinernema one each from maharashtra （IARI-EPN-mh）, Himachal Pradesh （IARI-EPN-hp）, Dehradun （IARI-EPN-dhdl）, Jharkhand （IARI-EPN-jhl） and two from madhya Pradesh （IARI-EPN-bpll ＆ IARI-EPN-gwll）, when compared with the only native species Steinernema thermophilum. One of the restriction enzyme, Rsal could differentiate all the six species/strains from one another. The three restriction enzymes yielded patterns which were of diagnostic value but Rsal appeared to be the best diagnostic marker for differentiating these isolates. A tree constructed based upon the band sharing amongst the isolates, produced trichotomy which placed strains from madhya Pradesh and Jharkhand in one group showing 94% homology, one strain from Bhopal （m.P） formed separate clade along with S. thermophilum with 72% similarity. These isolates, from maharashtra, Himachal Pradesh and Dehradun, showed only 51% similarity with the S. thermophilum by forming separate clade.

关键词： Entomopathogenic nematode ITS region RFLP ribosomal DNA Steinernema thermophilum molecularcharacterization.

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