Showing papers by "Indian Institute of Technology Bombay published in 1970"
TL;DR: In this article, the equilibrium capacitance of the interface between mercury and solutions containing camphor has been measured as a function of potential with a hanging drop electrode by using a low frequency (45 Hz) a.c. bridge.
45 citations
TL;DR: For the special case of Frumkin's isotherm, explicit equations have been derived relating the non-equilibrium capacitance with the time of adsorption as discussed by the authors.
27 citations
TL;DR: The effect of bromide and irreversibly adsorbed iodide ions on the anodic oxidation of methanol residue chemisorbed on platinized platinum has been investigated in this article.
23 citations
TL;DR: In this article, the elastic scattering of 1.12 MeV and 1.33 MeV γ-rays by lead, mercury, tungsten, tantalum, silver, molybdenum, zirconium and copper scatterers has been studied at scattering angles of 90° and 124.5°.
15 citations
01 Sep 1970-Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science
TL;DR: In this paper, the strain tempering of bainite has been carried out with EN 24, a medium carbon low alloy steel, which was austenitized at 850°C and isothermally transformed at 300°, 360°, and 400°C.
Abstract: In the present investigation the strain tempering of bainite has been carried out with (EN 24) a medium carbon low alloy steel. The specimens were austenitized at 850°C and isothermally transformed at 300°, 360°, and 400°C to produce bainite, strained and tempered in the range 100° to 400°C. The bainite formed at 360°C has been specifically examined by thermomagnetic analysis to confirm quantitatively the solution of ∈ carbide. Thermomagnetic analysis has shown that the carbide phase in bainite formed even at 360°C is a mixture of ∈ carbide and cementite. It has been found that with lowering of bainite transformation temperature, the strain tempering treatment results in higher strength consistent with good ductility. The present investigation favors the carbon dislocation trapping model for the mechanism of strain tempering of bainite, similar to that proposed for the strain tempering of martensite.
12 citations
TL;DR: In this paper, a rapid and sensitive method for the solvent extraction of chromium(VI) with mesityl oxide was developed for the extraction of the dephenylcarbazide complex at 540 nm.
Abstract: A rapid and sensitive method is developed for the solvent extraction of chromium(VI) with mesityl oxide. Chromium(VI) is extracted with pure mesityl oxide from 1 M HCl containing 2.5 M KCl as salting-out agent. The metal from the organic phase is stripped with dilute ammonia and determined photometrically as its dephenylcarbazide complex at 540 nm. Chromium(VI) can be extracted in presence of a large number of ions. Only 30 min are required for complete separation and determination. Average recovery was 98.6 ± 1.4%, the standard deviation ± 1.3% (14.9 μg of Cr).
11 citations
TL;DR: In this article, it is shown how the solutions for the bending of a sector plate clamped along the radial edges and with physically meaningful boundary functions prescribed on the curved edge can be directly reduced to an infinite system of linear algebraic equations.
Abstract: Constructing a bi-orthogonality relation it is indicated how the solutions for the bending of a sector plate clamped along the radial edges and with physically meaningful boundary functions prescribed on the curved edge can be directly reduced to an infinite system of linear algebraic equations. Some numerical results are presented for the bending of a uniformly loaded clamped sector plate.
8 citations
TL;DR: In this article, it was shown using simple perturbation theory that the intermolecular π-electron interaction leads to stabilisation of aromatic hydrocarbon dimers of certain tilted configuration with respect to two infinitely isolated monomers.
6 citations
TL;DR: In this paper, the relative efficiency of the eluants is discussed in terms of their elution constants and volume distribution coefficient, and the overall operation requires about 3-4 hrs.
Abstract: Cation-exchange behaviour of mg amounts of cadmium on Dowex 50W-X8 has been studied. Hydrochloric, nitric, perchloric, sulphuric, acids, and solutions of ammonium acetate, chloride and bromide, sodium chloride and nitrate, potassium iodide and EDTA were tested as eluants. The relative efficiency of the eluants is discussed in terms of their elution constants and volume distribution coefficient. Cadmium can be separated from a wide variety of elements. The overall operation requires about 3–4 hrs. Results are reproducible to ± 2.5%.
4 citations
TL;DR: In this article, the authors considered the distribution of thermal stress in an infinite wedge-shaped solid having a crack on the bisector plane of the wedge angle and used the Mellin transform to solve the equations of elastic equilibrium.
Abstract: Of concern here is the distribution of thermal stress in an infinite wedge-shaped solid having a crack on the bisector plane of the wedge angle.Mellin transform is used to solve the equations of elastic equilibrium. The mixed boundary conditions lead to dual integral equations, which are reducible toFredholm integral equations of the second kind. A comparison of the crack energy when thermal stress is present with the same for an isothermal distribution shows considerable increase which may be attributed to non-uniformity of temperature.
4 citations
01 May 1970
TL;DR: There are many stainless steels developed since World War II and these are classified by AISI as discussed by the authors, and they are being used in a wide variety of industrial applications. Stainless steel fabricated parts are to withstand widely varying temperatures, corrosive media and stresses.
Abstract: Stainless steels are being used in a wide variety of industrial applications. Stainless steel fabricated parts are to withstand widely varying temperatures, corrosive media and stresses. There are many stainless steels developed since World War II and these are classified by AISI.
01 Jan 1970
TL;DR: In this article, a new method was developed for the extraction of gold with diluted tributyl phosphate in toluene, which was shown to extract gold in the presence of a large number of ions.
Abstract: A new method is developed for the. solvent extraction of gold with diluted tributyl phosphate. In this method, 50% tributyl phosphate in toluene extracts gold quantitatively from 3 M hydrochloric acid containing 2 M lithium chloride as the salting-out agent. Gold from the organic phase is stripped with 1 M ammonium hydroxide and determined photometrically as its complex with stannous chloride. It is possible to extract gold in the presence of a large number of ions.
TL;DR: In this article, a systematic study on the cation exchange behavior of manganese on Dowex 50W-X8 is presented. Butler et al. used organic complexing acids as eluants and evaluated their efficiency in terms of elution constant.
Abstract: Systematic studies are presented on cation exchange behaviour of manganese on Dowex 50W-X8. Hydrochloric, sulphuric, nitric, perchloric acids; sodium and ammonium chloride, nitrate and sulphates, and organic complexing acids were tested as eluants. Their efficiency was evaluated in terms of elution constant. Manganese was separated from rubidium, caesium, mercury, uranium, vanadium and beryllium by gradient elution with mineral acids. It was separated from strontium, zinc, copper, nickel and aluminium by making use of organic complexing acids. Separation of manganese from titanium, tin, barium, thallium was accomplished by selective elution. Finally it was separated from iron, thorium, bismuth, zirconium, antimony and lead by process of selective sorption. The methods are applicable to the analysis of pyrolusite.
TL;DR: The non-linearity introduced by the residuals of the quadrature circuit components has been investigated and can be kept below a desired value by judicious selection of the components.
Abstract: A quadrature circuit consists of a resistance and a reactance in series. To convert non-electrical quantities, such as velocity, acceleration, pressure, temperature, etc., into frequency, this circuit is used along with a variable frequency generator. One of the components of the circuit is a parametric transducer which converts the measured quantity into the electrical parameter, such as resistance or inductance. The circuit, working as a self-adjusting device, possesses two advantages, namely, the linearity and the accuracy of measurement. The non-linearity introduced by the residuals of the quadrature circuit components has been investigated. It can be kept below a desired value by judicious selection of the components.
01 Jul 1970
TL;DR: In this paper, the propagation of strong shocks in an atmosphere of variable density at rest is studied and the energy gain of the flow enveloped by the shock is assumed to be time-dependent.
Abstract: The propagation of strong shocks in an atmosphere of variable density at rest is studied. The energy gain of the flow enveloped by the shock is assumed to be time-dependent. Analytical and numerical solutions of the similarity flows behind such shocks are obtained.
01 Jan 1970
TL;DR: In this paper, the cation exchange behavior of bismuth was studied on Dowex 50W-X8 with hydrochloric, sulfuric, nitric, and perchloric acids with ammonium chloride and sodium nitrate as the eluting agents.
Abstract: The cation exchange behavior of bismuth was studied on Dowex 50W-X8 with hydrochloric, sulfuric, nitric, and perchloric acids, with ammonium chloride and sodium nitrate as the eluting agents. The efficiency of eluants was evolved in terms of elution constant and volume distribution coefficient. Bismuth was separated from copper, cadmium, tin, aluminum, nickel, manganese, vanadium, magnesium, mercury, iron, zinc, silver, cobalty barium, and calcium by the gradient elution process. It was separated from lead, uranium, antimony, and strontium by selective elution with specific eluants. The oxyanions were separated from it by the selective sorption process. The method was found to be applicable to analysis of bismuth-based alloys.
TL;DR: In this paper, the particle size distribution of granules produced by centrifugal atomization was analyzed statistically and the yield of fractions of different sizes was calculated with a satisfactory degree of accuracy from the number of cylinder revolutions and the aperture diameter.
Abstract: The particle size distribution of granules produced by centrifugal atomization may be analyzed statistically. For the equipment employed, the yield of fractions of different sizes may be calculated with a satisfactory degree of accuracy from the number of cylinder revolutions and the aperture diameter. Using this technique, it is possible to regulate various process parameters with the aim of achieving the maximum yield of any desired fraction.
TL;DR: In this paper, an expression for the noise power per unit bandwidth of noise frequencies in the r.f.c. spectrum of electromagnetic radiations is obtained, and the maximum frequency of noise generated is determined by number density of ions in the plasma.
Abstract: In the present paper d.c. noise in plasma at electron-ion collisions is quantum mechanically analysed. Maximum frequency of noise generated is determined by number density of ions in the plasma. An expression for noise power per unit bandwidth of noise frequencies in the r.f. spectrum of electromagnetic radiations is obtained.
TL;DR: N-1,1′-(3,3′-Disulphonato-4,4′-biphenylene)-bis has been studied as spectrophotometric reagent for Pd and Mo as mentioned in this paper.
Abstract: N-1,1′-(3,3′-Disulphonato-4,4′-biphenylene)-bis-(3-N-hydroxy-3-N-phenyl-triazene) has been studied as spectrophotometric reagent for Pd and Mo Instantaneous development of colour, stability of the complexes over a wide range of pH, time and temperature are some desirable qualities of the reagent The tolerance of the reagent to the presence of neutral salts and other members of the Pt group metals is quite high The absorbance measurements are carried out at 430 (Pd) and 420 nm (Mo) The standard deviation is 0004 on the average (2–8 ppm Pd; 2–15 ppm Mo)