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  • Author or Editor: A. Kulkarni x
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Abstract  

Radiation induced decomposition of solid alkali metal nitrates at room temperature has been studied up to an absorbed dose of 300 kGy. [NO 2 ] increases with absorbed dose. From the kinetic scheme
\documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{upgreek} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} $$NO_3^ - \xrightarrow{{{}^k1}}NO_2^ - + 0; O + NO_2^ - \xrightarrow{{{}^k2}}NO_3^ - ;$$ \end{document}
and
\documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{upgreek} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} $$O + NO_3^ - \xrightarrow{{{}^k3}}NO_2^ - + O_2$$ \end{document}
, rate constants have been evaluated for the overall radiolytic decomposition of alkali metal nitrates. This kinetic scheme is applicable in the low dose range. At higher doses, however, the radiation induced reaction, NO 2 +1/2 O2 NO 3 may also contribute. The overall rate constants are 0.13×10–6 (LiNO3), 1.05×10–6 (NaNO3), 10.10×10–6 (KNO3), 9.50×10–6 (RbNO3) and 25.50×10–6 (CsNO3) kGy–1.
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Abstract  

Gamma-ray induced decomposition of some divalent nitrates, viz. Mg(NO3)2·6H2O, Ca(NO3)2·4H2O, Sr(NO3)2, Ba(NO3)2, Zn(NO3)2·6H2O, Cd(NO3)2·4H2O, Hg(NO3)2·2H2O, Mn(NO3)2·4H2O, Cu(NO3)2·3H2O and trivalent nitrates, viz. Al(NO3)3·9H2O, Fe(NO3)3·9H2O, Cr(NO3)3·9H2O, Y(NO3)3·6H2O, In(NO3)3·3H2O, La(NO3)3·6H2O, Ce(NO3)3·6H2O, Pr(NO3)3·6H2O, Bi(NO3)3·5H2O has been studied in solid state at room temperature. G(NO 2 ) values (after applying appropriate dose correction) have been found to vary in the range 0.12–3.16 and 0.069–2.15 for divalent and trivalent nitrates respectively. G'-values were calculated by dividing G by the ratio of number of electrons in nitrate ion to the total number of electrons in the nitrate salt. Cation size, its polarizing power, available free space in the crystal lattice and the number and location of water molecules seem to play a dominant role in radiolytic decomposition. For Zn, Sr, In, La and Ce nitrates dose variation studies have been carried out.

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In this Section of the journal, the literature on continuous flow synthesis (primarily organic synthesis and functional materials) from the period of January to March 2017 is presented. All the publications are listed ordered by journal name, with a Review article appearing at the end. The range of reactions performed in flow and number of multistep flow synthesis are seen to increase rapidly.

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Abstract  

Half life of56Mn in Mn, MnCl2.4H2O, KMnO4, MnO2, MnSO4.4H2O and that of128I in I2, NaI, KI, KIO4, HIO4, KIO3 was measured. The nuclides were produced by thermal neutron bomabardment in241Am-Be neutron source and their gamma activities were measured using a NaI/T1/ detector. Half life of56Mn varied with the change in oxidation state. No such systematic variation was observed for the half life of128I but it is affected by the nature of cation or anion attached to it. The change in decay constant, / was also calculated.

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In this section of the journal, the literature on continuous-flow synthesis (primarily organic synthesis and functional materials) from the period of January–March 2015 is presented. All the publications are listed and ordered by journal name, with review articles grouped at the end. This time, there is no section on highlighted articles; however, from the next issue, a succinct overview of specific publications will be included in this section. From the next issue, some publications having engineering principles relevant to flow synthesis will also be included in this list with specific highlights that will give new insights on flow synthesis.

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In this section of the journal, the literature on continuous-flow synthesis (primarily organic synthesis and functional materials) from the period of April to June 2015 is presented. All the publications are listed and ordered by journal name, with a review article appearing at the end. With a few special issues on flow synthesis that would be appearing in other journals in coming months, the list of publications in this area is expected to grow rapidly towards the end of this year.

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In this Section of the journal, the literature on continuous flow synthesis (primarily organic synthesis and functional materials) from the period of October — December 2016 is presented. All the publications are listed ordered by journal name, with two Review articles appearing at the end. In this quarter the number of papers on continuous flow organic synthesis is relatively less as a few special issues are planned in the coming months. Two contributions on machine learning for optimization in flow synthesis and the scale-up of continuous flow reactors from Eli Lilly are the real highlights of this quarter!

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In this section of the journal, the literature on continuous-flow synthesis (primarily organic synthesis and functional materials) from the period of July to September 2015 is presented. All the publications are listed and ordered by journal name, with a few review articles appearing at the end. With a few special issues related to flow synthesis and advances in organic process development, the number of publications on flow synthesis has grown steadily in this period. This also shows the growing interest of the community in adapting to flow synthesis.

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In this Section of the journal, the literature on continuous flow synthesis (primarily organic synthesis and functional materials) from the period of April — June 2016 is presented. All the publications are listed ordered by journal name, with a Review article appearing at the end. In this quarter the number of papers on continuous flow organic synthesis is relatively less as a few special issues are forthcoming. It is interesting to observe that the number of papers on continuous flow oxidation are more than ever before!

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