Showing papers by "Government College published in 1979"
TL;DR: In this paper, an empirical equation was obtained which relates the volume of material eroded from the tool electrode to the energy of the pulse, density, thermal conductivity, specific heat and latent heat of vaporization of the electrode material.
44 citations
TL;DR: In this article, the results were correlated to give a formula for overcut in terms of discharge voltage, circuit capacitance, diameter of the tool and the depth of the hole.
23 citations
TL;DR: In this paper, a microprobe analysis for the surface deposition and diffusion of tool material was carried out on mild steel (MS), high-carbon steel (HCS), and high-speed steel work samples, machined by an electrical discharge process using a relaxation circuit in distilled water and kerosene at 225 and 56·25mJ pulse energy, with copper and brass as tools.
Abstract: Electron microprobe analysis for the surface deposition and diffusion of tool material was carried out on mild steel (MS), high-carbon steel (HCS) and high-speed steel (HSS) work samples, machined by an electrical discharge process using a relaxation circuit in distilled water and kerosene at 225 and 56·25 mJ pulse energy, with copper and brass as tools. It was observed that high-energy machining results in lower surface deposition but more depth of diffusion. MS-HCS-HSS showed increasing surface deposition but decreasing depth of diffusion in the same order. Machining in distilled water at high-pulse energy resulted in lower surface deposition and depth of diffusion as compared to machining in kerosene. At low-pulse energy kerosene showed similar results. Tool material was found to deposit preferentially along the crater rims. The possibility of a certain typical geometry of crater formation in multi-spark machining is concluded. It is felt that each large crater is a result of three to four small crater...
18 citations
TL;DR: In this paper, the field equations of general relativity have been solved to obtain a solution for a static charged fluid sphere, which is free from singularity and satisfies the necessary physical conditions.
Abstract: In the present paper the field equations of general relativity have been solved to obtain a solution for a static charged fluid sphere. This solution is free from singularity and satisfies the necessary physical conditions.
16 citations
TL;DR: In this paper, a new method is proposed for measurement of lifetime of photoinjected carriers in the base layer of a p-n junction solar cell, the cell is switched from the open-circuit to the shortcircuit mode of operation by using a negative voltage pulse CRO trace of the output voltage pulse provides a direct means for lifetime measurement.
Abstract: A new method is suggested for measurement of lifetime of photoinjected carriers in the base layer of a p-n junction solar cell The cell is switched from the open-circuit to the shortcircuit mode of operation by using a negative voltage pulse CRO trace of the output voltage pulse provides a direct means for lifetime measurement
12 citations
01 Dec 1979
TL;DR: Eight species of freshwater oligochaetes, aeolosoma hemprichi Ehrenberg, andLimnodrilus hoffmeisteri Claparede are new to Kashmir, India.
Abstract: Eight species of freshwater oligochaetes,Aeolosoma hemprichi EhrenbergNais communis Piguet,Nais variabilis Piguet,Stylaria fossularis Leidy,Aulophorus furcatus (Muller),Pristina longiseta longiseta Ehrenberg,Tubifex tubifex Muller, andLimnodrilus hoffmeisteri Claparede are new to Kashmir, India.
5 citations
TL;DR: In this article, the authors consider the problem of determining the stress intensity factor and the crack energy in a transversely isotropic composite medium, containing a penny-shaped crack, and reduce the problem to solving a Fredholm integral equation of the second kind.
Abstract: We consider the problem of determining the stress intensity factor and the crack energy in a transversely isotropic composite medium, containing a penny-shaped crack. We assume that the crack surface is perpendicular to the bond face and the crack is opened by constant internal pressure. By use of integral transform, we reduce the problem to solving a Fredholm integral equation of the second kind. Numerical results are given for the combination of some practical materials such as magnesium and cadmium. The effect of transverse isotropy upon the stress intensity factor, the crack energy and the deformation on the crack surface is discussed.
4 citations
TL;DR: In this paper, an analysis of the response of an infinite, linearly elastic, orthotropic plate, resting on an elastic foundation, to a forcing function which may vary in both time and space is presented.
4 citations
TL;DR: Aulophorus flabelliger Stephenson, 1931 is reported for the first time from Andrha Pradesh, India.
Abstract: Aulophorus flabelliger Stephenson, 1931 is reported for the first time from Andrha Pradesh, India.
3 citations
TL;DR: The reactions of some organogermanium chlorides with Lewis bases have been studied calorimetrically in benzene solution as mentioned in this paper, showing that the germanium atom is readily sterically overcrowded.
3 citations
TL;DR: Somatic chromosome complements of the Indian burrowing toad, Uperodon globulosum, have been described for the first time and no heteromorphism in relation to sex chromosome pair has been recorded.
Abstract: Somatic chromosome complements of the Indian burrowing toad,Uperodon globulosum, have been described for the first time. The 2n number is 26 (NF=52) in both the sexes. No heteromorphism in relation to sex chromosome pair has been recorded. Deviations from 2n number (2n=10–28) have been noticed in the cells of different specimens. The result has been compared withU. systoma.
TL;DR: In this article, molecular force field studies of hexabromo-thorates (IV) anduranates(IV) have been carried out using four different force field models and a weighted least square adjustment has been used to fit the observed frequencies.
Abstract: Molecular force field studies of hexabromo-thorates(IV) and-uranates(IV) have been carried out using four different force field models. Weighted least square adjustment has been used to fit the observed frequencies. Mean amplitudes of vibration have also been calculated at 0°K and 298°K. The trends of force constants and mean amplitudes have also been discussed.
TL;DR: In this article, conductivity measurements were made on p-type polycrystalline InSb films which were heavily doped with copper and zinc, taking into account diffused and grain-boundary scattering.
01 Oct 1979
TL;DR: Aquatic oligochaeteAllonais pectinata from an old well at Chittoor is reported as a new record for Andhra Pradesh.
Abstract: Aquatic oligochaeteAllonais pectinata from an old well at Chittoor is reported as a new record for Andhra Pradesh.
TL;DR: An analytical investigation on the quantitative reduction of palladium (II) to the metal with hydroxylamine hydrochloride in alkaline medium has been carried out as discussed by the authors, and accurate and reproducible results for the gravimetric determination of 3 to 30 mg of Palladium have been recorded.
Abstract: An analytical investigation on the quantitative reduction of palladium (II) to the metal with hydroxylamine hydrochloride in alkaline medium has been carried out. Accurate and reproducible results for the gravimetric determination of 3 to 30 mg of palladium have been recorded. Effects of various foreign metal ions on the determination have been studied.
TL;DR: Conditioned taste aversion (CTA) established in rats by associating saccharin drinking with subsequent poisoning by Russell's viper venom is established in antivenom and control groups.
Abstract: Conditioned taste aversion (CTA) established in rats by associating saccharin drinking with subsequent poisoning by Russell's viper venom. Retention test revealed 76 and 56% reduction of saccharin intake in venom and antivenom-venom groups. No CTA was observed in antivenom and control groups.