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91.
Summary Hydrazine sulphate was found to liberate two atoms of iodine per molecule, when treated with an excess of iodate and iodide, and this was determined by thiosulphate or arsenious oxide in borax-boric acid buffer. The study of the action of iodate-iodide mixture on hydrazine sulphate at different stages of neutralisation and decomposition was carried out and iodometric relationships were verified. An interesting titration involving hydrazine sulphate both as a titrant and the titrating solution following its different reactions towards iodate-iodide mixture and iodine, is described. Hydrazine sulphate is found to be a satisfactory standard for the titration of iodine in presence of an alkaline buffer.Sincere thanks of the authors are due to Dr. S. S. Joshi, D. Sc. (London), for kind interest in the work. 相似文献
92.
Bellotti R Cafagna F Circella M De Cataldo G De Marzo CN Giglietto N Spinelli P Golden RL Stephens SA Stochaj SJ Webber WR De Pascale MP Morselli A Picozza P Ormes JF Streitmatter RE Massimo Brancaccio F Papini P Piccardi P Spillantini P Basini G Bongiorno F Ricci M Brunetti MT Codino A Grimani C Menichelli M Salvatori I 《Physical review D: Particles and fields》1996,53(1):35-43
93.
94.
The reactivity of preheated and -irradiated TiO2 was observed in KI solution by studying the kinetics of liberation of I2. The rate of the reaction was found to be low.
species proposed on the surface of oxide probably dissociate into
. surface sites which oxidize I– ions to produce free I2. During irradiation
and
are produced which are reducing in nature and therefore very low yields of I2 are observed for low -doses. In further irradiation the reformation of –O–O–, peroxy linkages is proposed hence the observed higher yields. All the processes ultimately lead to an oscillatory variation in yields of I2 with -doses. 相似文献
95.
96.
Nitis Mukhopadhyay Sudeep R. Bapat 《Annals of the Institute of Statistical Mathematics》2018,70(5):1049-1075
A negative binomial (NB) distribution is useful to model over-dispersed count data arising from agriculture, health, and pest control. We design purely sequential bounded-risk methodologies to estimate an unknown NB mean \(\mu (>0)\) under different forms of loss functions including customary and modified Linex loss as well as squared error loss. We handle situations when the thatch parameter \(\tau (>0)\) may be assumed known or unknown. Our proposed methodologies are shown to satisfy properties including first-order asymptotic efficiency and first-order asymptotic risk efficiency. Summaries are provided from extensive sets of simulations showing encouraging performances of the proposed methodologies for small and moderate sample sizes. We follow with illustrations obtained by implementing estimation strategies using real data from statistical ecology: (1) weed count data of different species from a field in Netherlands and (2) count data of migrating woodlarks at the Hanko bird sanctuary in Finland. 相似文献
97.
Summary An iodometric method for the determination of potassium permananate is described following its reduction to MnO2 in presence of boraxboric acid buffer at PH 8–10 by iodide and titration of the liberated iodine with standard arsenious oxide solution. Excess BaCl2 is added to coagulate the colloidal MnO2 whose otherwise partial reduction by iodide is prevented thereby.Sincere thanks of the authors are due to Prof. S. S. Joshi, for his kind interest in the work. 相似文献
98.
A bi-block graph is a connected graph all of whose blocks are complete bipartite graphs. We give a combinatorial interpretation of the Moore–Penrose inverse of the incidence matrix of a complete multipartite graph and a bi-block graph. 相似文献
99.
We report the first high pressure investigations of the nematic–isotropic transition in the composites of a liquid crystal compound with hydrophilic aerosil particles. The low concentrations of the aerosil particles used create soft gels of the composites. As expected TN–Iso, the nematic–isotropic transition at room pressure exhibits a non-monotonic variation with increasing aerosil concentration. This non-monotonic behaviour is seen in the isobaric scans over the wide range of pressures studied, and its “magnitude” is dependent on the pressure applied. The surprising result of the present investigations on these nanocolloidal systems is that the slope of the pressure–temperature boundary also exhibits a non-monotonic dependence with the aerosil concentration, which qualitatively is similar to that of the transition temperature variation. Employing the transition enthalpy values determined at room pressure using differential scanning calorimetric scans collected at low heating rates, we calculate the transition volume dependence on the aerosil concentration. The study adds a new dimension, namely, the influence of pressure on liquid crystalline transitions in restricted geometries. 相似文献
100.
Several powder samples of TiO2 are pretreated thermally at 300, 480 and 540°C, subjected to -irradiation and after irradiation added in one of the compartment of the concentration cell made up of Ag/Ag+. The adsorbed oxygen species O
2ad
–
, HO
2ad
–
and O
ad
–
on TiO2 provide negatively charged sites and develop EMF in the cell. The radiation damage, measured in terms of equilibrium EMF, received at lower doses is partially recovered at higher doses. It is proposed that in heating at 480°C, ad species react with Ti3+ ions in the surface and produce –O–O– peroxy linkages and block the negatively charged sites while in heating at 540°C Ti4O7 phase is produced on the surface which adsorbs O2 and provide large number of negatively charged sites. During -irradiation peroxy linkages are broken and the Ti4O7 phase is destroyed. Observed oscillatory variation in equilibrium EMF is explained on the basis of several reactions mentioned above proceeding at different rates during radiolysis. 相似文献