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Applied mathematics and mechanics(English Edition) 2008年第10期29卷 1263-1278页

作者： m.k.ghosh m.kanoria Department of mathematics Serampore CollegeSeramporeHooghly-712201India Department of Applied mathematics University of Calcutta 92 A.P.C.RoadKolkata-700009India

This paper is concerned with the determination of thermoelastic displacement, stress and temperature in a functionally graded spherically isotropic infinite elastic medium having a spherical cavity, in the context of the linear theory of generalized thermoelasticity with two relaxation time parameters （Green and Lindsay theory）. The surface of cavity is stress-free and is subjected to a time-dependent thermal shock. The basic equations have been written in the form of a vector-matrix differential equation in the Laplace transform domain, which is then solved by an eigenvalue approach. Numerical inversion of the transforms is carried out using the Bellman method. Displacement, stress and temperature are computed and presented graphically. It is found that variation in the thermo-physical properties of a material strongly influences the response to loading. A comparative study with a corresponding homogeneous material is also made.

关键词： generalized thermoelasticity functionally graded material (FGm) Green-Lindsay theory vector-matrix differential equation Bellman method

Displacements and stresses in composite multi-layered media due to varying temperature and concentrated load

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Applied mathematics and mechanics(English Edition) 2007年第6期28卷 811-822页

作者： m.k.ghosh m. kanoria Department of mathematics Serampore CollegeSeramporeHooghly-712 201India Department of Applied mathematics University of Calcutta92 A. P. C. RoadKolkata-700 009India

This paper deals with the determination of the thermo-elastic displacements and stresses in a multi-layered body set up in different layers of different thickness having different elastic properties due to the application of heat and a concentrated load in the uppermost surface of the medium. Each layer is assumed to be made of homogeneous and isotropic elastic material. The relevant displacement components for each layer are taken to be axisymmetric about a line, which is perpendicular to the plane surfaces of all layers. The stress function for each layer, therefore, satisfies a single equation in absence of any body forces. The equation is then solved by integral transform technique. Analytical expressions for thermo-elastic displacements and stresses in the underlying mass and the corresponding numerical codes are constructed for any number of layers. However, the numerical comparison is made for three and four layers.

关键词： thermal stress layered body concentrated load Bessel function integral transform

Preparation of Sm2O3 and Co3O4 from SmCo magnet swarf by hydrometallurgical processing in chloride media

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Journal of Rare Earths 2018年第7期36卷 725-732页

作者： k.Sahoo A.k.Nayak m.k.ghosh k.Sarangi CSIR-Institute of minerals and materials Technology Bhubaneswar-751013OdishaIndia

The recycling of rare earth elements（REE） from end-of-life REE based products is an environment friendly proposition. Waste Sm-Co based permanent magnet generated during machining is a good source for both Sm and Co. In the present study a simpler process of acid leaching at 80 ℃ followed by solvent extraction, oxalate precipitation and calcination is described for producing pure Sm2 O3 and Co3 O4. With either 10 vol% H2SO4 or 15 vol% HCI at 80 ℃ more than 95% Sm and Co are leached in 1 *** of Sm from sulphate leach liquor with TBP or Aliquat 336 was poor. Although extraction with TOPS-99 is quantitative but Sm from sulphate leach liquor precipitated as Sm2（SO4）3·8 H2O. The chloride leach liquor at an initial pH of 2.5 and with 1.2 mol/L TOPS-99 shows requirement of 4-stages at A：O = 3：2. Stripping with oxalic acid precipitates Sm-oxalate which is calcined at 800 ℃ to produce Sm2 O3. Co3 O4 is recovered from the raffinate through oxalate precipitation followed by calcination at450℃.

关键词： SmCo magnet Samarium Cobalt TOPS-99 Solvent extraction Precipitation stripping

Characterization and kinetic study on ammonia leaching of complex copper ore

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Transactions of Nonferrous metals Society of China 2014年第5期24卷 1587-1595页

作者： A.A.BABA m.k.ghosh S.R.PRADHAN D.S.RAO A.BARAL F.A.ADEkOLA Department of Industrial Chemistry University of Ilorin CSIR-Institute of minerals and materials Technology

Ammonia leaching kinetics of a complex Cu-ore assaying 8.8% Cu and 36.1% Fe was examined. mineralogical characterization indicated that the major phase of the ore was siderite with chalcopyrite as the major sulfide mineral. The effects of parameters such as agitation, temperature, NH3 concentration, particle size and oxygen partial pressure （Po2） were investigated. Under the standard leaching conditions of 125-212 μm particle size, 120 ℃, 1.29 mol/L NH3 and 202 kPa ofpo2, about 83% Cu could be selectively extracted in 2.5 h. However, when using higher NH3 concentration and lower particle size, more than 95% extraction was achieved. The leaching process was found to be surface reaction controlling. The estimated activation energy was （37.6±1.9） kJ/mol and empirical orders of reaction with respect topos and [NH3] were about 0.2 and 1, respectively.

关键词： ammonia leaching chalcopyrite siderite leaching kinetics

共混顺序对丁腈橡胶和氯磺化聚乙烯橡胶共混胶性能的影响

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橡胶参考资料 1993年第6期23卷 51-59页

作者： A.R.Tripathy m.k.ghosh C.k.Das 李久玉

1 前言在特定的应用场合下,能产生具有较好综合性能的两种或两种以上聚合物的共混技术是聚合物加工中的一个非常活跃的领域。丁腈橡胶(NBR)具有极好的耐油性,而高温屈挠性和耐臭氧性却很差。最近,Hofm-

关键词：丁腈橡胶氯磺化聚乙烯橡胶共混

Regression analysis of squeezing-induced hybrid nanofluid flow in Darcy-Forchheimer porous medium

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Applied mathematics and mechanics(English Edition) 2025年第1期46卷 193-208页

作者： k.mUHAmmAD m.SARFRAZ Department of Humanities and Sciences School of Electrical Engineering and Computer Science National University of Sciences and Technology Department of mathematics Quaid-i-Azam University

This article presents a mathematical model addressing a scenario involving a hybrid nanofluid flow between two infinite parallel plates. One plate remains stationary, while the other moves downward at a squeezing velocity. The space between these plates contains a Darcy-Forchheimer porous medium. A mixture of water-based fluid with gold(Au) and silicon dioxide(Si O2) nanoparticles is formulated. In contrast to the conventional Fourier's heat flux equation, this study employs the Cattaneo-Christov heat flux equation. A uniform magnetic field is applied perpendicular to the flow direction, invoking magnetohydrodynamic(mHD) effects. Further, the model accounts for Joule heating, which is the heat generated when an electric current passes through the fluid. The problem is solved via NDSolve in mATHEmATICA. Numerical and statistical analyses are conducted to provide insights into the behavior of the nanomaterials between the parallel plates with respect to the flow, energy transport, and skin *** findings of this study have potential applications in enhancing cooling systems and optimizing thermal management strategies. It is observed that the squeezing motion generates additional pressure gradients within the fluid, which enhances the flow rate but reduces the frictional drag. Consequently, the fluid is pushed more vigorously between the plates, increasing the flow velocity. As the fluid experiences higher flow rates due to the increased squeezing effect, it spends less time in the region between the plates. The thermal relaxation, however, abruptly changes the temperature, leading to a decrease in the temperature fluctuations.

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Efficacy of antimicrobials in preventing resistance in solid organ transplant recipients:A systematic review of clinical trials

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World Journal of Transplantation 2025年第1期15卷 156-164页

作者： Carlos m Ardila Pradeep k Yadalam Jaime Ramírez-Arbelaez Department of Basic Sciences Faculty of Dentistry Biomedical Stomatology Research GroupUniversidad de Antioquia U de AMedellín 0057Colombia Department of Postdoctoral Program CIFE University CenterCuernavaca 62330MorelosMexico Department of Periodontics Saveetha Dental CollegeSaveetha Institute of Medical and HealthSIMATSSaveetha UniversityChennai 600077Tamil NaduIndia Department of Transplantation Hospital San Vicente FundaciónRionegro 054047Colombia

BACkGROUND In the absence of effective antimicrobials,transplant surgery is not viable,and antirejection immunosuppressants cannot be administered,as resistant infections compromise the life-saving goal of organ *** To evaluate the efficacy of antimicrobials in preventing resistance in solid organ transplant *** A systematic review was conducted using a search methodology consistent with the preferred reporting items for systematic reviews and *** review included randomized clinical trials that evaluated the efficacy of antimicrobial agents(prophylactic or therapeutic)aimed at preventing antimicrobial *** search strategy involved analyzing multiple databases,including Pubmed/mEDLINE,Web of Science,Embase,Scopus,and SciELO,as well as examining gray literature sources on Google Scholar.A comprehensive electronic database search was conducted from the databases’inception until may 2024,with no language *** After the final phase of the eligibility assessment,this systematic review ultimate-ly included 7 articles.A total of 2318 patients were *** most studied microorganisms were cytomegalovirus,although vancomycinresistant enterococci,Clostridioides difficile,and multidrug-resistant Enterobacterales were also *** antimicrobials used in the interventions were mainly maribavir,valganciclovir,gancic-lovir,and *** concern,all clinical trials showed significant proportions of resistant microorga-nisms after the interventions,with no statistically significant differences between the groups(mean resistance 13.47%vs 14.39%),except for two studies that demonstrated greater efficacy of maribavir and valganciclovir(mean resistance 22.2%vs 41.1%in the control group;Pmicrobial-resistant microor

关键词： Antimicrobial resistance Antimicrobials Antivirals Solid organ transplant recipients Infections microorganisms Cytomegalovirus

What controls PTEN and what it controls （in prostate cancer）

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Asian Journal of Andrology 2012年第1期14卷 130-131页

作者： Paramita m ghosh Department of Urology and Department of Biochemistry and molecular medicine University of California Davis Sacramento CA 95817 USA and Research Services VA Northern California Health Care System Mather CA 95655 USA

The standard of care for metastatic prostate cancer （PCa） is androgen deprivation therapy since almost all PCa growth is initially reliant on the androgen receptor （AR）. However, almost all patients develop resistance to this therapy within 18-24 months, and current treatment for castration-resistant prostate cancer （CRPC） is extremely limited, despite the advent of new drugs that target the AR,

关键词： PTEN prostate cancer androgen deprivation therapy AR CRPC

SYNCHRONIZATION IN A RING OF UNIDIRECTIONALLY COUPLED FITZHUGH-NAGUmO NEURONS

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International Journal of Biomathematics 2014年第1期7卷 161-171页

作者： ANINDITA BHATTACHARJEE m. k. DAS SUBHENDU ghosh Galgotia Institute of management and Technology Greater Noida UP 201306 India Institute of Informatics and Communication University of Delhi South CampusBenito-Juarez Road New Delhi 110021 India Department of Biophysics University of Delhi South Campus Benito-Juarez Road New Delhi 110021 India

Synchronization behavior of an ensemble of unidirectionally coupled neurons with a constant input is investigated. Chemical synapses are considered for coupling. Each neuron is also considered to be exposed to a self-delayed feedback. The synchronization phenomenon is analyzed by the error dynamics of the response trajectories of the system. The effect of various model parameters e.g. coupling strength, feedback gain and time delay, on synchronization is also investigated and a measure of synchrony is computed in each cases. It is shown that the synchronization is not only achieved by increasing the coupling strength, the system also required to have a suitable feedback gain and time delay for synchrony. Robustness of the parameters for synchrony is verified for larger systems.

关键词： Unidirectionally coupled chemical synapse self-delayed feedback synchrony measure.

Facies analysis and paleoenvironmental interpretation of Piacenzian carbonate deposits from the Guitar Formation of Car Nicobar Island,India

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Geoscience Frontiers 2013年第6期4卷 755-764页

作者： Amit k.ghosh Suman Sarkar Birbal Sahni Institute of Palaeobotany 53 University RoadLucknow 226 007India

Facies characterization of Piacenzian （late Pliocene） carbonate sediments of the Guitar Formation in Car Nicobar Island,India and the subsequent integration of paleoecological data have been applied to interpret the paleoenvironment of the coralline algal-reef ***-section analysis reveals that Amphiroa,Corallina and Jania are the dominant geniculate corallines,while Lithothamnion,mesophyllum,Phymatolithon,Lithophyllum,Spongites and Lithoporella are the major non-geniculate corallines contributing to the sedimentary *** small and larger benthic foraminifera also dominate the biogenic ***,barnacle shells,echinoid spines,fragments of bryozoans,mollusks and ostracodes are the subordinate *** dominate the studied facies while packstones and boundstones （with wackestone elements） are the sub lithofacies showing a fair *** carbonate facies presenting a complete reef complex have been distinguished that were deposited in shallow intertidal,back-reef shelf/lagoon,reef and deeper fore-reef shelf *** of coralline algal and benthic foraminiferal assemblages,taphonomic signatures of abrasion and fragmentation,grain size,angularity and encrustation indicate a shallow to relatively deeper bathymetric horizon of approximately 10-60 m that corresponds to a regime of high to moderate hydrodynamic conditions.

关键词： Facies analysis Coralline algae Benthic foraminifera Piacenzian Guitar Formation Car Nicobar