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1.
Nadkarni S 《Physical review letters》1988,60(6):491-494
2.
A sensitive spectrophotometric method based on the extraction of a uranium-benzoate-Malachite Green complex by chlorobenzene is described. The absorption maximum is at 635 nm and the molar absorptivity is 8.3 x 10(4) 1 mole(-1), cm(-1). A preliminary separation of uranium by extraction with methyl isobutyl ketone from acid-deficient aluminium nitrate solution is used to avoid interferences. An aliquot of the extract is then diluted with chlorobenzene and shaken with benzoate buffer containing Malachite Green (MG). The method has been applied for the determination of uranium in a synthetic leach solution. The complex extracted is probably [MG(2)(C(6)H(5)COO)(3)][MG(+)]. 相似文献
3.
A. Karnik S. Kailas A. Chatterjee P. Singh A. Navin D. C. Biswas D. M. Nadkarni A. Shrivastava S. S. Kapoor 《Zeitschrift für Physik A Hadrons and Nuclei》1995,351(2):195-198
The fission fragment angular distributions for the system12C +232Th have been measured in the energy range 0.97<>c.m./VB<1.22. the=" measured=" anisotropies=" have=" been=" compared=" with=" the=" predictions=" of=" the=" standard=" saddle=" point=" statistical=" model,=" using=" the=" second=" moment=" of=" the=" compound=" nucleus=" spin=" distribution=">1.22.>l2 deduced from a Wong model fit to the fission excitation function. While the measured anisotropies agree with the standard saddle point statistical model for Ec.m./VB>1.05, they are abnormally large at lower energies. This is also true for the existing measurements of16O and19F +232Th systems. Since for this system pre-equilibrium fission contributions are not expected, this anomaly indicates strong channel coupling effects leading to an increase in l2 at sub-barrier energies.The authors thank Drs. R.K. Choudhury and A. Saxena for useful discussions, Dr. R.J. Singh for making the thorium target and the Pellectron operation staff for excellent operation of the machine. 相似文献
4.
A Borel automorphismT on a standard Borel space \(\left( {X,\mathbb{B}} \right)\) is constructed such that (a) there is no probability measure invariant underT and (b) there is no Borel setW weakly wandering underT and which generates the invariant setX. 相似文献
5.
Fifteen elements at trace levels have been determined by neutron activation analysis in the biological standard kale distributed
byBowen. La, Br, As, Se, Sc, Ag, Zn, Co, Cr, Sb, Eu, Fe, and Zr have been determined by a nondestructive technique using a high-resolution
Ge(Li) detector. Two more elements, Au and Hg, have been determined after radiochemical separation. The nondestructive procedure
is shown to yield data in generally good agreement with those obtained by destructive techniques. Potential sources of error
in the nondestructive technique are discussed. 相似文献
6.
B. Y. Nadkarni 《Mikrochimica acta》1965,53(5-6):880-887
Summary The cyanogen bromide-aniline hydro chloride system for the determination of nicotinic acid in foodstuffs has been systematically studied, and a simplified and rapid procedure for the estimation of the vitamin has been developed.
Zusammenfassung Die Bestimmung von Nikotinsäure in Nahrungsmitteln mit Hilfe von Bromcyan und Anilinchlorhydrat wurde systematisch überprüft. Ein vereinfachtes und rasches Verfahren zur Ermittlung des Vitamingehaltes wurde ausgearbeitet.
Résumé On a fait l'étude systématique de l'emploi du mélange bromure de cyanogène-chlorhydrate d'aniline pour le dosage de l'acide nicotinique dans les substances alimentaires et l'on a mis au point un procédé simplifié et rapide pour l'estimation de la vitamine.相似文献
7.
C. R. Rajan V. M. Nadkarni S. Ponrathnam 《Journal of polymer science. Part A, Polymer chemistry》1988,26(9):2581-2588
A new route to synthesize poly(p-phenylene sulfide) by nucleophilic substitution of 1,4-dibromobenzene with sodium sulfide in N-methylpyrrolidone is described. Kinetic evaluation shows the reaction to be of second order with two distinctive rate constant regimes. The first rate constant is higher and is operative until 50% conversion, whereas in the second regime (between 50 and 92% conversion) the rate is slower. The kinetics of this route is compared under identical conditions with the conventional synthesis based on 1,4-dichloro benzene and sodium sulfide. 相似文献
8.
Acid-catalyzed polycondensation of phenol and crotonaldehyde results in soluble thermoplastic resins over a broad range of compositions. The thermal and curing behavior of the resins are found to vary markedly with the phenol to crotonaldehyde mole ratio and the purity of crotonaldehyde. Infrared analysis of the resins and their fractions separated by column chromatography indicates that all the resins are structurally similar. The number-average molecular weights of the resins fall in the range of 400 to 600. The resins from distilled crotonaldehyde exhibit higher molecular weights than those from crude crotonaldehyde. The thermal properties of the resins are comparable to the Novolak-type phenol-formaldehyde resins. The thermoplastic nature is retained even at higher fraction of crotonaldehyde, unlike for the conventional Novolak resins. 相似文献
9.
10.
V. S. Nadkarni 《Indian Journal of Physics》2009,83(6):805-811
This article describes our attempts since 1996 to systematically design and synthesize monomers and corresponding polymers
for nuclear track detection. So far more than 15 homopolymers/copolymers have been prepared and tested by us for this purpose.
Some of these polymers show better track detection characteristics vis-á-vis commercially available poly allyl diglycol carbonate (PADC) track detectors.
相似文献