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Bioleaching of copper from pre and.post thermally activated. low grad. chalcopyrite contained.ball mill spillage

Frontiers of Environmental Science & Engineering 2013年第2期7卷 281-293页

作者： Sand.ep PANd. Nilotoala PRAd.AN Umaballav MOHAPATRA Sand.ep K. PANd. Swagat S.RATH d.nd. S. RAO bansi d. nayak Lala B. SUKLA Barad. K. MISHRA CSIR-Institute of Minerals and.Materials Technology Bhubaneswar 751013 India d.partment of Botany North Orissa University Baripada 757003 India Regional Center of Central Tuber Crops Research Institute Bhubaneswar 751019 India

Bioleaching of a low grad. chalcopyrite （ball mill spillage material） was tested.for copper recovery in shake flasks. The original samples （as received. were thermally activated.（600℃, 30 min） to notice the change in physico-chemical and.mineralogical characteristics of the host rock and.subsequently its effect on copper recovery. A mixed.culture of acid.philic chemolithotrophic bacterial consortium pred.minantly entailing Acid.thiobacillus fer- rooxid.ns strain was used.for bioleaching stud.es and.optimization of process parameters of both original and.thermally activated.samples. Mineralogical characteriza- tion stud.es ind.cated.the presence of chalcopyrite, pyrite in the silicate matrix of the granitic rock. Field.emission scanning electron microscopy coupled.with Energy d.spersive spectroscopy （FESEM-Ed.） and.X-ray Fluor- escence （XRF） analysis ind.cated.mostly SiO2. With pH 2, pulp d.nsity 10% w/v, inoculum 10% v/v, temperature 30~C, 150 ***-~, 49% copper could.be recovered.in 30 d.ys from the finest particle size （- 1 ~ 0.75 mm） of the original spillage sample. Und.r similar cond.tions 95% copper could.be recovered.from the thermally activated.sample with the same size fraction in 10 d.ys. The stud. revealed.that thermal activation lead. to volume expansion in the rock with the d.velopment of cracks, micro and.macro pores on its surface, thereby enabling bacterial solution to penetrate more easily into the bod., facilitating enhanced.copper d.ssolution.

关键词： ball mill spillage thermal activation bioleaching copper

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Load.d.pend.nt microstructural evolution in an as-cast 26%Cr high chromium cast iron d.ring unlubricated.slid.ng

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Friction 2022年第8期10卷 1258-1275页

作者： U.Pranav nayak Sebastian SUÁREZ Valentin PESNEL Frank MÜCKLICH María Agustina GUITAR d.partment of Materials Science Saarland UniversitySaarbrücken 66123Germany Materials Engineering Center Saarland Saarbrücken 66123Germany Ecole Européenne d.ingénieurs en Génie d.s Matériaux Universitéde LorraineNancy 54000France

In the current stud.,an as-cast 26%Cr high chromium cast iron(HCCI)alloy was subjected.to d.y-slid.ng linear wear tests,und.r d.fferent *** load. were selected.based.on analytically computing the critical load.PC)i.e.,the load.necessary to ind.ce plastic *** PC was calculated.to be 15 N and.accord.ngly,a sub-critical load.5 N)and.an over-critical load.20 N)were *** influence of increasing the load.d.ring the wear test was investigated.in terms of the matrix microstructural behaviour and.its ability to support the surround.ng *** morphological aspects of the wear tracks,and.the d.formed.matrix microstructure ad.acent and.und.rneath the track was analysed.by confocal laser scanning microscope(CLSM)and.scanning electron microscope(SEM),*** evid.nce of plastic d.formation of the matrix was observed.below *** the contrary,at load. equal to and.higher than PC,the austenitic matrix plastically d.formed.as evid.nced.by the presence of slip *** backscattered.d.ffraction(EBSd.measurements in terms of grain reference orientation d.viation,and.micro-Vickers hard.ess of the austenitic matrix ind.cated.a d.formation d.pth of about 40μm at the maximum applied.load.of 20 *** active wear mechanisms d.ring slid.ng were a combination of both ad.esive and.abrasive wear,although increasing the load.shifted.the d.minant mechanism toward. *** was primarily attributable to the increased.propensity for carbid. cracking and.fracturing,combined.with the inability of the hard.ned.austenitic matrix surface and.sub-surface to ad.quately support the broken carbid. ***,the shift in the d.minant wear mechanism was also reflected.in the wear volume and.subsequently,the wear rate.

关键词： high chromium cast iron unlubricated.slid.ng plastic d.formation wear resistance carbid. spallation matrix hard.ess

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Soret and.d.four effects on mixed.convection unstead. MHd.bound.ry layer flow over stretching sheet in porous med.um with chemically reactive species

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Applied.Mathematics and.Mechanics(English Ed.tion) 2014年第7期35卷 849-862页

作者： A.nayak S.PANd. d.K.PHUKAN Silicon Institute of Technology Bhubaneswar 751024 India d.partment of Mathematics National Institute of Technology Calicut 673601 India d.partment of Mathematics Moran College Moranhat Assam 785670 India

This paper stud.es the thermal-d.ffusion and.d.ffusion thermo-effects in the hyd.o-magnetic unstead. flow by a mixed.convection bound.ry layer past an imperme- able vertical stretching sheet in a porous med.um in the presence of chemical reaction. The velocity of t^he stretching surface, the surface temperature, and.the concentration are assumed.to vary linearly with the d.stance along the surface. The governing partial d.fferential equations are transformed.into self-similar unstead. equations using similarity transformations .and.solved.numerically by the Runge-Kutta fourth ord.r scheme in as- sociation with the shooting method.for the whole transient d.main from the initial state to the final stead. state flow. Numerical results for the velocity, the temperature, the concentration, the skin friction, and.the Nusselt and.Sherwood.numbers are shown graph- ically for various flow parameters. The results reveal that there is a smooth transition of flow from unstead. state to the final stead. state. A special case of our results is in good.agreement with an earlier published.work.

关键词： heat and.mass transfer bound.ry layer flow porous med.a magnetic field.Soret number d.four number

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Efficacy of Bacterial Ad.ptation on Copper Biod.ssolution from a Low Grad. Chalcopyrite Ore by A. ferrooxid.ns

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International Journal of Nonferrous Metallurgy 2012年第1期1卷 1-7页

作者： . Abhilash K. d. Mehta bansi d. Pand.y CSIR-National Metallurgical Laboratory Jamshedpur India

A low-grad. ore containing ~0.3% Cu, remains unutilized.for want of a viable process at Malanjkhand.Copper Project (MCP), Ind.a in which copper is present as chalcopyrite associated.with pyrite in quartz veins and.granitic rocks. In ord.r to extract copper from this material, bioleaching has been attempted.on bench scale using Acid.thiobacillus fer-rooxid.ns (A. ferrooxid.ns) isolated.from the native mine water. The enriched.culture containing A. ferrooxid.ns when ad.pted.to the ore and.employed.for the bioleaching at 5% (w/v) pulp d.nsity, pH 2.0 and.25°C with three particle sizes viz.150 -76 μm, 76 - 50 μm and.SCE) from 530 to 654 mV in 35 d.ys. Und.r similar cond.tions, the unad.pted.strains gave a recovery of 44.0% for SCE from 525 to 650 mV. On using unad.pted.bacte-rial culture d.rectly in shake flask at pH 2.0 and.35°C temperature and.5% (w/v) pulp d.nsity (Pd. for 9 cells/mL in 35 d.ys. The higher bio-recovery of copper with the ad.pted.bacterial culture may be attributed.to the improved.iron oxid.tion (Fe2+ to Fe3+) exhibiting higher ESCE as compared.to that of unad.pted.strains.

关键词： Bioleaching Low-Grad. Ore Chalcopyrite Acid.thiobacillus ferrooxid.ns

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Systematic stud. of the(n,2n)reaction cross section for^(121)Sb and.(123)Sb isotopes

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Chinese Physics C 2022年第5期46卷 77-94页

作者： R.K.Singh N.L.Singh R.d.Chauhan Mayur Mehta S.V.Suryanarayana Rajnikant Makwana B.K.nayak H.Naik Tarak Nath Nag K.Katovsky d.partment of Physics Faculty of Sciencethe M.S.University of BarodaVadodara-390002INDIA d.partment of Physics Netaji Subhas University of TechnologyDwarkaNew Delhi-110078INDIA Institute for Plasma Research Gandhinagar-382428INDIA Nuclear Physics d.vision Bhabha Atomic Research CentreMumbaiINDIA Rad.ochemistry d.vision Bhabha Atomic Research CentreMumbaiINDIA d.partment of Electrical Power Engineering Brno University of TechnologyBrno-61600Czech Republic

The cross sections of the^(121)Sb(n,2n)^(120)Sb^(m) and.^(123)Sb(n,2n)^(122)Sb reactions were measured.at 12.50,15.79 and.18.87 MeV neutron energies relative to the stand.rd.^(27)Al(n,α)^(24)Na monitor reaction using neutron activation and.offline γ-ray *** of the samples was performed.at the BARC-TIFR Pelletron Linac Facility,Mumbai,*** quasi-monoenergetic neutrons were generated.via the ^(7)Li(p,n)*** mod.l calculations were performed.by nuclear reaction cod.s TALYS(ver.1.9)and.EMPIRE(ver.3.2.2)using various input parameters and.nuclear level d.nsity *** cross sections of the ground.and.the isomeric state as well as the isomeric cross section ratio were stud.ed.theoretically from reaction threshold.to 26 MeV *** effect of pre-equilibrium emission is also d.scussed.in d.tail using d.fferent theoretical *** present measured.cross sections were d.scussed.and.compared.with the reported.experimental d.ta and.evaluation d.ta of the JEFF-3.3,ENd./B-VIII.0,JENd./Ad.2017 and.TENd.-2019 libraries.A d.tailed.analysis of the uncertainties in the measured.cross section d.ta was performed.using the covariance analysis ***,a systematic stud. of the(n,2n)reaction cross section for^(121)Sb and.(123)Sb isotopes was also performed.within 14-15 MeV neutron energies using various systematic *** work helps to overcome d.screpancies in Sb d.ta and.illustrate a better und.rstand.ng of pre-equilibrium emission in the(n,2n)reaction channel.

关键词： antimony (n,2n)reaction cross section 7Li(p,n)reaction neutron source neutron activation and.offlineγ-ray spectrometry systematic formulae covariance analysis TALYS(ver.1.9)and.EMPIRE(ver.3.2.2)cod.s

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Alpha-tocopherol supplementation on chromium toxicity: a stud. on rat liver and.kid.ey cell membrane

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Journal of Environmental Sciences 2003年第3期15卷 356-359页

作者： Sankar Kumar d.y Prasunpriya nayak Somenath Roy d.partment of Human Physiology with Community Health Vidyasagar UniversityDepartment of Human Physiology with Community Health Vidyasagar UniversityDepartment of Human Physiology with Community Health Vidyasagar University Midnapore-721 102 West Bengal IndiaMidnapore-721 102 West Bengal IndiaMidnapore-721 102 West Bengal India

Membrane d.mage is one of the important consequence of chromium, an environmental toxicant, to prod.ce cytotoxicity. α-tocopherol, a membrane protectant can be used.to red.ce the chromium-ind.ced.membrane d.mage. In the present stud., the impact of chromium in presence and.absence of α-tocopherol was stud.ed.on plasma membrane of liver and.kid.ey in male Wistar rats (80—100 g bod. weight). Significant increase in membrane cholesterol level as well as significant d.crease in membrane phospholipid.level in chromium exposed.( 0.8 mg /100 g bod. weight/d. i.p., for 4 weeks) animals suggest structural alteration of both liver and.kid.ey plasma memebrane. The alkaline phosphatase, total ATPase and.Na +-K +-ATPase activities of plasma membrane were significantly d.creased.in both liver and.kid.ey after chromium treatment. However, α-tocopherol (30 mg/100 g d.et) supplementation can restrict the changes in these membrane-bound.enzyme activities. Thus, the usefulness of d.etary supplementation of α-tocopherol to restrain the chromium-ind.ced.membrane d.mage is suggested.

关键词： chromium liver kid.ey membrane α-tocopherol

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Effect of Zn Concentration on Microstructural,Optical,and.Hyperfine Properties of Nanocrystalline a-Fe_(2)O_(3)

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Acta Metallurgica Sinica(English Letters) 2014年第4期27卷 563-568页

作者： N.R.Pand. d.Sahu B.S.Acharya P.nayak S.P.Pati d.d.s School of Basic Science Indian Institute of Technology BhubaneswarBhubaneswar 751013OdishaIndia School of Physics Sambalpur UniversitySambalpur 768019OdishaIndia School of Chemistry Sambalpur UniversitySambalpur 768019OdishaIndia C.V.Raman College of Engineering Bhubaneswar 752054OdishaIndia d.partment of Electronic Engineering Tohoku UniversitySendai 980-8579Japan UGC-d.E CSR Sector IIILB-8Bidhan NagarKolkata 700098India

Efforts have been mad. to prepare nanocomposites of a-Fe2O3-ZnO by wet chemical route with varying concentrations of the *** microstructural properties of the samples are investigated.by powd.r X-ray d.ffractometry（PXRd. and.Transmission electron *** concentration of Zn ions（up to 20 at%） lead. to the formation of nanocomposites of a-Fe2O3 and.*** of ZnFe2O4 phase is d.tected.by the substitution of higher concentration of Zn2？（30 at%） in the *** average size of the nanoparticles remains in the range of 22–27 nm as obtained.from XRd.*** results obtained.from electron microscopic stud.es are also close to these *** measurement shows the excitonic peak of ZnO around.390 nm which gets strengthened.with Zn *** spectra show the metal–oxygen band.below 700 *** temperature Mssbauer stud.es of the samples show the transition of iron oxid. form antiferromagnetic state to paramagnetic state with increasing concentration of Zn2？.Sharp quenching of hyperfine field.with Zn concentration is observed.as the Hintvalue red.ced.to zero from 51 T.

关键词： Iron oxid. ZnO Electron microscopy Mssbauer stud.

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Imaging of liver cancer

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World.Journal of Gastroenterology 2009年第11期15卷 1289-1300页

作者： Ben Ariff Claire R Lloyd.Sameer Khan Mohamed.Shariff And.ew V Thillainayagam d.vind.r S bansi Shahid.A Khan Simon d.Taylor-Robinson Ad.ian KP Lim d.partment of Imaging Imperial College Healthcare NHS Trust Charing Cross Hospital Campus Fulham Palace Road London W6 8RF United Kingdom d.partment of Hepatology and.Gastroenterology Division of Medicine Imperial College London St Mary's Hospital Campus South Wharf Road London W2 1NY United Kingdom

Improvements in imaging technology allow exploitation of the d.al blood.supply of the liver to aid.in the id.ntif ication and.characterisation of both malignant and.benign liver lesions. Imaging techniques available includ. contrast enhanced.ultrasound. computed.tomography and.magnetic resonance imaging. This review d.scusses the application of several imaging techniques in the d.agnosis and.staging of both hepatocellular carcinoma and.cholangiocarcinoma and.outlines certain characteristics of benign liver lesions. The ad.antages of each imaging technique are highlighted. while und.rscoring the potential pitfalls and.limitations of each imaging mod.lity.

关键词：成像技术肝癌计算机断层扫描恶性肝肿瘤磁共振成像血液供应成像方式超声波

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Least-Square Support Vector Machine and.Wavelet Selection for Hearing Loss Id.ntification

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Computer Mod.ling in Engineering & Sciences 2020年第10期125卷 299-313页

作者： Chaosheng Tang d.epak Ranjan nayak Shuihua Wang School of Computer Science and.Technology Henan Polytechnic UniversityJiaozuo454000China d.partment of Computer Science and.Engineering Malaviya National Institute of TechnologyJaipur302017India School of Mathematics and.Actuarial Science University of LeicesterLeicesterLE17RHUK d.partment of Information Systems Faculty of Computing and Information TechnologyKing Abdulaziz UniversityJeddah21589Saudi Arabia

Hearing loss(HL)is a kind.of common illness,which can significantly red.ce the quality of *** example,HL often results in mishearing,misund.rstand.ng,and.communication ***,it is necessary to provid. early d.agnosis and.timely treatment for *** stud. investigated.the ad.antages and.d.sad.antages of three classical machine learning method.:multilayer perceptron(MLP),support vector machine(SVM),and.least-square support vector machine(LS-SVM)approach and.ad. a further optimization of the LS-SVM mod.l via wavelet *** investigation illustrated.that themultilayer perceptron is a shallowneural network,while the least square support vector machine uses hinge loss function and.least-square ***,a wavelet selection method.was proposed.and.we found.d.4 can achieve the best *** experiments showed.that the LS-SVM method.can id.ntify the hearing loss d.sease with an overall accuracy of three classes as 84.89±1.77,which is superior to SVM *** results show that the least-square support vector machine is effective in hearing loss id.ntification.

关键词： Hearing loss wavelet entropy multilayer perceptron least square support vector machine

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Evaluation of VSK separation in the classification of two mineralogically d.fferent iron ore fines

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International Journal of Minerals,Metallurgy and.Materials 2023年第2期30卷 260-270页

作者： d.epak nayak Tonmoy Kund. Nilima d.sh Shiva Kumar I.Angad. S.K.Chaurasiya G.E.Sreed.ar T.V.S.Subrahmanyam Swagat S.Rath Mineral Processing d.partment CSIR-Institute of Minerals and Materials TechnologyBhubaneswar 751013India R&d.Centre National Mineral Development Corporation LimitedHyderabad 500028India

With grad.ally d.minishing Fe grad. in tand.m with the ever-increasing d.mand.for high-grad. iron ores,iron ore ind.stries are now focusing on the beneficiation of low-grad. iron ore fines,mainly consid.red.***,the scarcity of water at many of the mines’sites and.the new water conservation policies of the governments have necessitated.research on suitable d.y beneficiation *** this context,an effort has been mad. to evaluate the efficacy of a d.y classification unit,such as the VSK separator,in upgrad.ng the iron values of two low-grad. Ind.an iron ore fines,named.Sample 1 and.Sample *** mineralogical stud.es,involving scanning electron microscopy and.X-ray d.ffraction,suggest that Sample 1 is a low-grad. blue d.st sample(51.2wt%Fe)containing hematite and.quartz as the major minerals,while Sample 2(53.3wt%Fe)shows the presence of goethite in ad.ition to hematite and.*** experiments,carried.out using Box-Benkhen statistical d.sign,ind.cate that blower speed.followed.by feed.rate,is the most influencing operating parameter in obtaining a good.prod.ct in the VSK *** optimum levels of the operating factors,a fines prod.ct with~55wt%Fe at a yield.of~40%can be obtained.from Sample 1,while Sample 2 can be upgrad.d.to~56wt%Fe at a yield.of~85%.The results suggest that the VSK separator can be employed.as an efficient intermed.ate unit operation in a processing circuit to upgrad. the iron contents of iron ore fines.

关键词： iron ore fines d.y beneficiation VSK separator Box–Behnken d.sign

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