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Probing and understanding interaction of Eu(Ⅲ)withγ-alumina in presenceof malonic acid

Journal of Environmental Sciences 2021年第2期33卷 181-192页

作者： Madhuri A Patel Aishwarya Soumitra Kar Vaibhavi V Raut B.S.Tomar Radioanalytical Chemistry Division Bhabha Atomic Research CentreMuambai 400085India Homi Bhabha National institute AnushaktinagarMumbai 400094India

Radionuclide migration in aquatic environment is influenced by its sorption onto colloids/mineral oxides and the presence of organic complexing *** a view to understand the sorption of trivalent actinides by mineral oxides in presence of organic acid,in the present study,Eu(Ⅲ),malonic acid(MA)andγ-alumina are considered as representatives of trivalent actinides,low molecular weight natural occurring organic acid and aluminol sites,*** influence of MA on sorption of Eu(Ⅲ)byγ-alumina was elucidated by batch sorption,spectroscopic techniques and surface complexation modeling,for the first *** Total Reflection-Fourier Transform Infrared spectroscopic studies of MA sorbed onγ-alumina revealed the presence of two inner-sphere surface *** sorption for binary(alumina-Eu(Ⅲ))and ternary(alumina-Eu(Ⅲ)-MA)systems were investigated as a function of p H,Eu(Ⅲ)concentration and sequential addition of Eu(Ⅲ)/*** p H edge for Eu(Ⅲ)sorption shifts to higher p H with increasing Eu(Ⅲ)*** ternary systems,Eu(Ⅲ)sorption is significantly enhanced at p H<***(Ⅲ)speciation onγ-alumina is independent of addition sequence of Eu(Ⅲ)/*** resolved fluorescence spectroscopy of Eu(Ⅲ)sorbed onγ-alumina exhibited two surface species,≡XOEu^2+and(≡YO)2 Eu^(+).The enhancement in I 616/I 592 and lifetime for ternary systems,as compared to binary system,at low p H,indicates the participation of Eu-MA complexes in the formation of surface species in ternary *** diffuse layer model has been employed to successfully model the experimental sorption profiles of binary and ternary systems,using code FITEQL 4.0,by considering the surface species identified by spectroscopic techniques.

关键词： Malonic acid Eu(Ⅲ) γ-alumina Sorption ATR-FTIR TRFS Surface complexation modeling

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Rare earth(La)and metal ion(Pb)substitution induced structural and multiferroic properties of bismuth ferrite

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Journal of Advanced Ceramics 2015年第4期4卷 292-299页

作者： Poorva SHARMA Ashwini KUMAR Dinesh VARSHNEY Materials Science Laboratory School of PhysicsVigyan BhawanDevi Ahilya UniversityKhandwa Road CampusIndore 452001India Department of Physics Southeast UniversityJiangning DistrictNanjing 211189China

In this study,bulk samples of multiferroic with compositional formula,BiFeO3 and Bi_(0.825)A_(0.175)FeO_(3)(A=La,Pb),were synthesized by solid state reaction route.X-ray diffraction(XRD)along with the Rietveld refinement revealed the distorted rhombohedral(R3c)structure for pristine BiFeO3 and Bi0.825La0.175FeO3 and tetragonal(P4/mmm)for Bi_(0.825)Pb_(0.175)FeO_(3)*** support the structural results,bond length between atoms for both of the compounds was calculated.A change in Raman mode position in BiFeO3(BFO)has been observed with La and Pb substitution from Raman scattering measurements and also recommended a structural change with rare earth and metal ion substitution at Bi *** the frequency dependent dielectric constant and dielectric loss plots,a decrease in dielectric values with increase in frequency was observed for both of the *** microelectronic devices,porous ceramics with lower value of dielectric constant are most ***,further studies are also needed to carefully tune the magnetoelectric properties and structural distortion after La/Pb substitution in BFO.

关键词： ceramics X-ray diffraction(XRD) Raman spectroscopy dielectric properties

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Heat transfer in boundary layer stagnation-point flow towards a shrinking sheet with non-uniform heat flux

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Chinese Physics B 2013年第7期22卷 328-333页

作者： Krishnendu Bhattacharyya Department of Mathematics The University of Burdwan

In this paper, the effect of non-uniform heat flux on heat transfer in boundary layer stagnation-point flow over a shrinking sheet is studied. The variable boundary heat fluxes are considered of two types： direct power-law variation with the distance along the sheet and inverse power-law variation with the distance. The governing partial differential equations （PDEs） are transformed into non linear self-similar ordinary differential equations （ODEs） by similarity transformations, and then those are solved using very efficient shooting method. The direct variation and inverse variation of heat flux along the sheet have completely different effects on the temperature distribution. Moreover, the heat transfer characteristics in the presence of non-uniform heat flux for several values of physical parameters are also found to be interesting.

关键词： non-uniform heat flux heat transfer stagnation-point flow shrinking sheet

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Optical Emission Spectroscopic Study During the Evaporation of Aluminium in the Thermal Plasma Reactor

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Plasma Science and Technology 2010年第1期12卷 27-30页

作者： I.BANERJEE N.V.KULKARNI S.KARMAKER V.L.MATHE S.V.BHORASKAR A.K.DAS Applied Physics Department Birla Institute of Technology Department of Physics University of Pune Department Bhabha Atomic Research Center

The oxidation of aluminium was studied using optical emission spectroscopy （OES） during the evaporation of aluminium in traces of oxygen in a thermal plasma reactor. The ratio of the measured line intensities of Al-O with that of Al follows the exact trend as of that obtained from the corresponding line intensities in X-ray diffraction spectra of the synthesized samples. In this paper the inherent capacity of emission spectroscopy in evaluating the growth processes under plasma induced reactions is presented.

关键词： thermal plasma reactor aluminium oxidation optical emission spectroscopy,X-ray diffraction

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Time-resolved evaluation of uranium plasma in different atmospheres by laser-induced breakdown spectroscopy

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Plasma Science and Technology 2018年第12期20卷 65-74页

作者： Manjeet SINGH Arnab SARKAR Fuel Chemistry Division Bhabha Atomic Research CentreMumbai 400 085India Homi Bhabha National Institute AnushaktinagarMumbai 400 094India

This work reports spectroscopic studies of uranium containing plasma generated in air and argon environments. The 532 nm Q-switched Nd：YAG laser generates the optical breakdown plasma, which was recorded by a spectrometer and an intensified charge coupled device having a resolution of 25 pm. Neutral and ionized uranium lines in the wavelength range of 385.8-391.9 nm indicate significant width and shift variations during the first few microseconds. Electron temperature and density of the plasma are determined using the Boltzmann plot and the Saha-Boltzmann equation at various time delay. The study reveals the power law decay pattern of electron temperature and density, which changes to exponential decay pattern if large gate- width is used to acquire the signal, due to an averaging effect.

关键词： uranium laser induced plasma plasma parameter temporal evaluation electron temperature electron density LIBS

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Spatiotemporal binary interaction and designer quasi-particle condensates

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Chinese Physics B 2014年第3期23卷 326-332页

作者： Ramaswamy Radha Pattu Sakthi Vinayagam Hyun Jong Shin Kuppuswamy Porsezian Centre for Nonlinear Science Post Graduate and Research Department of Physics Government College for Women (Autonomous) Department of Physics and Research Institute of Basic Sciences Kyung Hee University Department of Physics Pondicherry University

We introduce a new integrable model to investigate the dynamics of two component quasi-particle condensates with spatiotemporal interaction strengths. We derive the associated Lax pair of the coupled Gross-Pitaevskii （GP） equation and construct matter wave solitons, We show that the spatiotemporal binary interaction strengths not only facilitate the stabilization of the condensates, but also enables one to fabricate condensates with desirable densities, geometries, and properties, leading to the so-called ＂designer quasi-particle condensates＂.

关键词： gauge transformation bright soliton Gross-Pitaevskii (GP) equation

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Boundary Layer Flow and Heat Transfer over an Exponentially Shrinking Sheet

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Chinese Physics Letters 2011年第7期28卷 198-201页

作者： Krishnendu Bhattacharyya Department of Mathematics the University of BurdwanBurdwan-713104West BengalIndia

An analysis is made to study boundary layer flow and heat transfer over an exponentially shrinking *** similarity transformations in exponential form,the governing boundary layer equations are transformed into self-similar nonlinear ordinary differential equations,which are then solved numerically using a very efficient shooting *** analysis reveals the conditions for the existence of steady boundary layer flow due to exponential shrinking of the sheet and it is found that when the mass suction parameter exceeds a certain critical value,steady flow is *** dual solutions for velocity and temperature distributions are *** increasing values of the mass suction parameter,the skin friction coefficient increases for the first solution and decreases for the second solution.

关键词： solution method exponential

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MHD Boundary Layer Flow of Dilatant Fluid in a Divergent Channel with Suction or Blowing

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Chinese Physics Letters 2011年第8期28卷 175-178页

作者： Krishnendu Bhattacharyya G.C.Layek Department of Mathematics The University of BurdwanBurdwan-713104West BengalIndia

An analysis is carried out to study a steady magnetohydrodynamic(MHD)boundary layer flow of an electrically conducting incompressible power-law non-Newtonian fluid through a divergent *** channel walls are porous and subjected to either suction or blowing of equal magnitude of the same kind of fluid on both *** fluid is permeated by a magnetic field produced by electric current along the line of intersection of the channel *** governing partial differential equation is transformed into a self-similar nonlinear ordinary differential equation using similarity *** possibility of boundary layer flow in a divergent channel is analyzed with the power-law fluid *** analysis reveals that the boundary layer flow(without separation)is possible for the case of the dilatant fluid model subjected to suitable suction velocity applied through its porous walls,even in the absence of a magnetic ***,it is found that the boundary layer flow is possible even in the presence of blowing for a suitable value of the magnetic *** is found that the velocity increases with increasing values of the power-law index for the case of dilatant *** effects of suction/blowing and magnetic field on the velocity are shown graphically and discussed physically.

关键词： field walls boundary

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Effect of Indium and Antimony Doping on SnS Photoelectrochemical Solar Cells

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Chinese Physics Letters 2014年第10期31卷 89-92页

作者： Sunil H. Chaki Mahesh D. Chaudhary M. P. Deshpande Department of Physics Sardar Patei University Vallabh Vidyanagar-388120 Gujarat India

Single crystals of pure SnS, indium （In） and antimony （Sb） doped SnS are grown by the direct vapor transport technique. Two doping concentrations of 5 at. % and 15 at. % are employed for both In and Sb dopants. In total, five samples are studied, i.e., pure SnS, 5at.% In-doped SnS, 15at.% In-doped SnS, 5at.% Sb-doped SnS and 15at.% Sb-doped SnS single crystals. The energy dispersive analysis of x-ray （EDAX） and x-ray diffraction （XRD） analysis show that all the five as-grown single crystal samples possess near perfect stoichiometry and orthorhombic structure, respectively. The doping of In and Sb in SnS is established from the EDAX data and from the shift in the peak positions in XRD. Photoeleetroehemical （PEC） solar cells are fabricated by using the as- grown single crystal samples along with iodine/iodide electrolytes. Mott-Schottky plots for different compositions of iodine/iodide electrolytes show that O. 025 M 12 ＋ 1 M Nal＋2 M Na2 S04 ＋0.5 M 1-12 S04 will be the most suitable electrolyte. Study of efficiency （η） and fill factor for different intensities of illuminations at room temperature is carried out for the five samples. The In-doped SnS single crystals show better PEC efficiency than the undoped and Sl〉doped SnS single crystals.

关键词： Effect Cells Single

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Dual Solutions in Unsteady Stagnation-Point Flow over a Shrinking Sheet

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Chinese Physics Letters 2011年第8期28卷 165-168页

作者： Krishnendu Bhattacharyya Department of Mathematics The University of BurdwanBurdwan-713104West BengalIndia

An analysis is made to study the dual nature of solution of unsteady stagnation-point flow due to a shrinking *** similarity transformations,the governing boundary layer equations are transformed into the self-similar nonlinear ordinary differential *** transformed equations are solved numerically using a very efficient shooting *** study reveals the conditions of existence,uniqueness and non-existence of unsteady similarity *** dual solutions for velocity distribution exist for certain values of velocity ratio parameter(c/a),and the increment in the unsteadiness parameter A increases the range of c/a where solution ***,with increasing A,the skin friction coefficient increases for the first solution and decreases for the second.

关键词： solution method unsteady

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