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81.
82.
Jain A Mohapatra M Godbole SV Tomar BS 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2008,71(3):1007-1010
Complexation of Eu(III) with alpha-hydroxy isobutyric acid (HIBA), a model compound of humic acid, has been studied by time resolved fluorescence spectroscopy. The ratio of fluorescence intensity of the two peaks at 616 and 592 nm (I(616/592)) was found to increase with increasing ligand to metal ratio. The I(616/592) data was used to deduce the stability constant of Eu-HIBA complexes of the type ML(i) (i=1-3). The formation of multiple ligand complexes was also corroborated by lifetime data which was found to increase with increasing [HIBA]/[Eu] ratio thus indicating replacement of coordinated water molecules by HIBA. 相似文献
83.
Z. Leppert Z. Majewska K. Ho C. S. Wan S. H. Wen F. W. Cheng G. Lunde F. Stiebel L. M. Labaune A. Jermakow W. Leithe F. Fritz W. F. Geddes F. H. Lehberg A. Afanassjew M. Podolskaja M. Sserga K. Höll E. Delvaux N. N. Godbole A. M. Se P. S. Varma G. M. Garde M. Procopio H. Levin Alma Tomingas M. E. Marks C. H. Lea G. S. Fawcett F. M. Biffen F. D. Snell 《Analytical and bioanalytical chemistry》1938,113(5-6):235-240
84.
R M Godbole 《Pramana》1993,41(1):83-105
In this talk I review theoretical bounds on mass of the Higgs scalar in the Standard Model (SM) and then summarise current experimental limits from the LEP experiments. Following this I discuss the search strategies for the SM Higgs at LEP 200 and the TeV energye + e ? colliders which are under discussion. This will be followed by a summary of the Higgs search potential of the pp supercolliders such as SSC/LHC. I then close with a brief discussion of a ‘Dark Higgs’ whose dominant decay modes are into invisible channels. 相似文献
85.
86.
V. C. Adya A. Sengupta B. A. Dhawale B. Rajeswari S. K. Thulasidas S. V. Godbole 《Journal of Radioanalytical and Nuclear Chemistry》2012,291(3):843-848
Trace metallic impurity analysis by spectroscopic techniques is one of the important steps of chemical quality control of
nuclear fuel materials. Depending on the burn-up and the storage time of the fuel, there is an accumulation of 241Am in plutonium based fuel materials due to β decay of 241Pu. In this paper, attempts were made to develop a method for separation of 241Am from 1.2 kg of analytical solid waste containing 70% U, 23% Pu, 5% Ag and 1–2% C as major constituents along with other
minor constituents generated during trace metal assay of plutonium based fuel samples by d. c. arc carrier distillation atomic
emission spectrometry. A combination of ion exchange, solvent extraction and precipitation methods were carried out to separate
~45 mg of 241Am as Am(NO3)3 from 15 L of the analytical waste solution. Dowex 1×4 ion exchange chromatographic method was used for separation of Pu whereas
30% TBP–kerosene was utilized for separation of U. Am was separated from other impurities by fluoride precipitation followed
by conversion to nitrate. The recovery of Pu from ion exchange chromatographic separation step was ~93% while the cumulative
recovery of Am after separation process was found to be ~90%. 相似文献
87.
Godbole MD Roubeau O Mills AM Kooijman H Spek AL Bouwman E 《Inorganic chemistry》2006,45(17):6713-6722
The three novel clusters [Mn6O4(OMe)2(OAc)4(Mesalim)4] (3), [Mn8O2(OH)2(OMe)12(OAc)2(Mesalim)4] (4), and [Fe10O4(OMe)14Cl2(Mesalim)6] (5) have been synthesized from a simple bidentate ligand HMesalim (HMesalim = methyl salicylimidate). Starting from the mononuclear complex [Mn(Mesalim)2(OAc)(MeOH)].MeOH (1), either the hexanuclear complex 3 or the octanuclear complex 4 is obtained after recrystallization, depending upon the reaction conditions and solvents used. Similarly, starting from the purple-colored mononuclear complex [Fe(Mesalim)2Cl] (2), the orange-colored decanuclear iron(III) cluster 5 has been obtained upon recrystallization from methanol. Complex 3, which could also be prepared directly from manganese acetate and the ligand, has a face-sharing double-cubane [Mn6O6] core, unique in transition metal chemistry. Compounds 4 and 5 are composed of [M3O4] partial cubanes. All complexes belong to a class of oxo-bridged cubic close-packed molecular clusters resembling the metal oxide/hydroxide ores. Complex 4 exhibits intramolecular ferromagnetic interactions, as evidenced from dc magnetic susceptibility studies (1.8-300 K), resulting in a high-spin ground state, probably with S(T) = 8. Complex 4 displays single molecule magnet behavior as indicated by frequency and temperature dependences of its ac susceptibility. An Arrhenius plot gave relatively large experimental activation energy of 36.0 K. The magnetic properties of complexes 3 and 5 are dominated by antiferromagnetic interactions leading to zero-spin ground states. 相似文献
88.
The aim of this paper is to prove some common fixed point theorems for finite number of discontinuous, noncompatible mappings on noncomplete fuzzy metric spaces. We improve extend and generalize several fixed point theorems on metric spaces,uniform spaces and fuzzy metric spaces.We also give formulas for total number of commutativity conditions for finite number of mappings. 相似文献
89.
90.
Determination of metallic impurities in U3O8 using energy dispersive X-ray fluorescence spectrometry
V. Natarajan B.A. DhawaleB. Rajeswari N.S. HonS.K. Thulasidas N.K. PorwalS.V. Godbole V.K. Manchanda 《Spectrochimica Acta Part B: Atomic Spectroscopy》2008
In order to examine the capability of energy dispersive X-ray fluorescence spectrometry for the determination of some common metallic impurities in nuclear grade U3O8 matrix, a series of synthetic U3O8 standards, containing impurities such as Ca, Co, Cr, Cu, Fe, Mn, Mo, Ni ,V, W and Zn in the concentration range, 100–1000 μg/g, were prepared. Using these standards, calibration curves were set up for different elements after optimizing the spectrometer parameters. Two synthetic samples and five reference standards obtained through an inter-laboratory comparison exercise within analytical laboratories of Department of Atomic Energy, India were analyzed to evaluate the performance of the newly developed analytical methods. The estimates for most of the analytes were in good agreement with the added amounts. The method is fast, since it requires no chemical treatment. The method has good precision for the analytes determined. 相似文献