Browsing by Issue Date, starting with "1961"

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Diphenyl carbazone as an internal indicator in volumetric analysis - Determination of calcium
(Springer-Verlag, 1961) G.S. Deshmukh; M.G. Bapat; A.L.J. Rao
A method for the volumetric determination of calcium using diphenyl carbazone as indicator has been described. Calcium is precipitated by excess sodium oxalate, the excess oxalate being determined by standard lead nitrate. A study of the possible interferences of barium and magnesium in the above determination is undertaken and it is shown that the above procedure is applicable to the determination of calcium in the presence of magnesium and barium. © 1961 Springer-Verlag.
Absorption and accumulation of potassium in component parts of sugarcane as affected by age, phosphorus deficiency and phosphorus fertilization
(1961) J.N. Singh; K.N. Lal
[No abstract available]
Uptake of phosphorus and its accumulation in component parts of sugarcane as affected by age, phosphorus deficiency and levels of phosphorus
(1961) K.N. Lal; J.N. Singh
[No abstract available]
Plumage control in black-headed Munia (Munia atricapila)
(Springer-Verlag, 1961) R.N. Saxena; J.P. Thapliyal
[No abstract available]
Franck-Condon factors and r-centroids for the triplet band system of CO molecule
(1961) N.L. Singh; D.C. Jain
It has been verified that the Morse potential function is a good approximation for the representation of the potential energy curves of d 3π and a3π electronic states of the CO molecule. The Franck-Condon factors for the triplet band system have been computed by the direct method of numerical integration of the Morse wave functions. The r-centroids for this band system have been calculated by (i) the direct method of numerical integration and (ii) the quadratic equation method of Nicholls and Jarmain. A close agreement is obtained between the values of r-centroids evaluated by both the methods. Assuming that the electronic transition moment is approximately constant, the relative population of the vibrational levels of the d3π state of the CO molecule has been calculated using Herman and Rakotoarijimy's experimental data on the relative intensity measurement of the triplet bands developed in the presence of xenon.
A revision of Kellermann's calculations of the specific heats of sodium chloride
(1961) B. Dayal; B.B. Tripathi
In the well-known work on the lattice vibrations and the specific heats of sodium chloride, Kellermann has not assigned a correct statistical weight to several frequencies and has, further, omitted one point of the Brillouin zone. His results have, therefore, been revised to take these factors into account.
Relative intensities in the triplet system of CO bands
(1961) N.L. Singh; D.C. Jain
[No abstract available]
Polarggraphic behaviour of selenium (IV)
(Springer-Verlag, 1961) G.S. Deshmukh; O.P. Asthana
[No abstract available]
Amperometric ascorbimetric determination of cerium(IV) and Iron(III) with two polarized electrodes
(Springer-Verlag, 1961) D. Singh; Asha Varma; V.S. Agarwala
Amperometric ascorbimetric determinations of cerium(IV) and ferric iron have been carried out at 50°C with two polarized electrodes at 200 and 100 mV respectively. The results obtained are fairly accurate and precise within ±1.0 per cent. A simple method for successive determination of cerium and iron has been developed; and conditions for such estimations have been established. At an acidity of 2.5 M with respect to sulphuric acid, it is possible to ward off the reduction of ferric iron and thereby cerium(IV) is successfully titrated with ascorbic acid in this medium. After completion of the reaction and then lowering the acid concentration to pH 1.5 with aid of ammonium hydroxide, FeIII is titrated with standard ascorbic acid yielding good results. © 1961 Springer-Verlag.
Isotope shift in axially asymmetric nuclei
(1961) M.L. Rustgi
The effect of axial asymmetry on isotope shift, as introduced in the theory of Davydov and Filippov, is investigated and is found to be non-negligible. An accurate experimental study of the isotope shift may therefore provide evidence in favor of or against Davydov-Filippov's theory for deformed nuclei. © 1961 The American Physical Society.
Amperometric titrations with the help of selenites - Determination of cobalt
(Springer-Verlag, 1961) G.S. Deshmukh; V.D. Anand; A. Joseph
A new procedure for rapid amperometric titration of cobalt based on precipitation of cobalt as the normal selenite is described. Potassium chloride (0.1 M) containing 0.01% gelatin as the maximum suppressor has been used as the supporting electrolyte. The use of 50% overall concentration of methanol was found essential for these titrations. The concentration of alcohol necessary for cobalt concentrations below 2 millimolars was 70%. The titrations have been performed at an applied potential of -1.5 volts vs. S.C.E. Effect of methanol on the equivalence point of the titration has also been studied. The procedure described gives accurate results, which agree well with the formula CoSeO3 for the normal selenite of cobalt. © 1961 Springer-Verlag.
On Hector's base
(1961) C.P. Joshua; .K. Verma; K.S. Suresh
[No abstract available]
Some theorems on self-reciprocal functions
(1961) S. Masood
[No abstract available]
Evaluation of Vibration Spectrum and Heat Capacities of Tungsten and Molybdenum by de Launay's Electron Gas Model
(1961) B. Sharan
De Launay's model of electron‐lattice interaction has been applied to the evaluation of the vibration spectrum of two‐body‐centred cubic metals viz. tungsten and molybdenum. Following KELLERMANN the reciprocal phase space is divided into 10 × 10 × 10 cells. However, the secular determinant is solved only for 47 points of the first Brillouin Zone (including the origin). A correct enumeration, considering the proper statistical weights, yields 3,000 frequencies ‐ a point missed by the earlier workers. The calculated specific heats are in very good agreement with the experimental values. In the case of tungsten the results have been compared with those of FINE who ignored the effect of the electrons in the lattice vibrations. It is found that de Launay's model gives a better agreement with observed data than Fine's at all temperatures. Copyright © 1961 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim
A new sensitive and specific test for cobalt
(Springer-Verlag, 1961) V.D. Anand
The p-nitrophenylhydrazone of 3-isonitrosopentane-2-one gives in ammoniacal solution a red coloration with cobalt, which provides a sensitive and specific test. Cyanide as well as a high concentration of ammonium salts prevent the test. Palladium, silver, nickel, copper and most common cations and anions do not interfere. © 1961 Springer-Verlag.
Spectrophotometric Determination of Cobalt with Thioglycolic Acid
(1961) V.D. Anand; G.S. Deshmukh; C.M. Pandey
The yellow-red color of cobalt(II) with thioglycolic acid (sodium salt) having maximum absorbance at 358 mμ has been employed as the basis for a spectrophotometric method for the quantitative determination of cobalt. The system was found to obey Beer's law between the concentration limits of 1.0 to 10.0 × 10−6 gram of cobalt(II) and to remain stable for over 48 hours at room temperature. The effects of pH, reagent concentration, time of heating, and aging were studied. Interference by heavy metals such as copper, nickel, iron, chromium, molybdenum, uranium, vanadium, etc. was prevented by extracting cobalt from the solutions. © 1961, American Chemical Society. All rights reserved.
Plumage in Lai Munia (Amandava amandava)
(1961) J.P. Thapliyal; P.D. Tewary
An Indian ploceid finch, Amandava amandava, develops brilliant nuptial plumage in males during the breeding season. The females and males outside of the breeding season have modest brown hen plumages. The fact that castrates, whether originally of male or of female sex, assume nuptial plumages during the breeding season of the species indicates that plumage character is under the control of hypophyseal hormones and that hypophyses are passing through an activity cycle which is independent of presence or absence of gonads.
Annealing of radiolytic damage in some nitrates. Part 1. - Lead nitrate
(1961) A.G. Maddock; S.R. Mohanty
A kinetic study of the reformation of nitrate from the radiolysis products in irradiated crystalline lead nitrate is presented. The data can be interpreted in terms of a unimolecular recombination, affecting a proportion of the fragments and a bimolecular process, with a higher energy of activation, governing the behaviour of the remainder. Some alternative mechanisms are also considered and an interpretation of the above, preferred, mechanism is given. Annealing of photolytic damage in the same material is also reported.
Spectrophotometric determination of cobalt with cobaltone-I (p-nitrophenylhydrazone of diacetylmonoxime)
(Springer-Verlag, 1961) G.S. Deshmukh; V.D. Anand; C.M. Pandey
Cobalt(II) in ammoniacal solution forms a pink, water soluble complex with Cobaltone-I (p-nitrophenylhydrazone of diacetylmonoxime) in the pH range 11.7-11.9 with absorption peak at 520 nm. The system obeys Beer's Law in the concentration range 0.5-5 ppm of cobalt. Effect of different variables on the colored complex has been studied in detail and optimum conditions determined. Most of the common anions do not interfere with the reaction. The tolerance limits of the cations (other than cobalt) forming soluble amines have been determined. Alkali cyanide raises these limits considerably. © 1961 Springer-Verlag.
Participation of the electron gas in lattice vibrations
(1961) B. Dayal; S.P. Singh
The vibration spectrum and the specific heats of gold have been studied by two models in order to test whether the electrons participate in the complete vibration spectrum of a crystal. The two models represent the extreme cases given by de Launay, one of which ignores the effect of electrons on the lattice vibration while the other assumes its full participation for all the frequencies. Frequencies have been calculated for the 1000 points of the Brillouin zone and the specific heats have been evaluated by the sampling technique. The choice of this metal for calculation was dictated by the fact that, on account of the large discrepancy in the Cauchy relation, the difference between the lattice frequencies of the two models is expected to be very high. It is found that the central force model does not predict the value of the Cv of the metal at all correctly, while de Launay's model is in qualitative agreement with experiment above 15°K. De Launay's idea that electrons participate only in the non-dispersive region of the spectrum thus appears to be wrong.