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Showing papers by "Aligarh Muslim University published in 1981"


Journal ArticleDOI
TL;DR: K2O, TiO2, P205, Zr, Y, Sr and Nb data from the Panjal Traps of Kashmir indicate that the lava erupted in a rift tectonic setting as discussed by the authors.
Abstract: K2O, TiO2, P205, Zr, Y, Sr and Nb data from the Panjal Traps of Kashmir indicate that the lava erupted in a rift tectonic setting. This is also suggested by the other features of these rocks and volcanic history of the area. The time of eruption represents the initial phase of break-up of the Indian plate from the Siberian plate. This conclusion is in good agreement with the current views on the tectonic evolution of the area.

59 citations


Journal ArticleDOI
TL;DR: In this article, the authors studied the oxidation behavior of Fe-C alloys in the temperature range 600-850°C and measured CO2evolved during oxidation using an infrared gas analyzer.
Abstract: The oxidation behavior of Fe-C alloys in the temperature range 600–850°C has been studied. CO2evolved during oxidation was measured using an infrared gas analyzer. The presence of C lowers the oxidation rate relative to that of pure Fe and this has been related to the rejection of carbon at the alloy-scale interface causing poor contact between scale and alloy. As a result, the scale contains a higher proportion of magnetite, which reduces its overall growth rate. Very little carbon is lost to the atmosphere. The ease with which the rejected carbon is incorporated into the alloy depends on the alloy structure.

40 citations


Journal ArticleDOI
TL;DR: The trivalent lanthanide ions have a coordination number of ten in the series Ln(TFAA) 3 dipy·2H 2 O as discussed by the authors, where TFAA = trifluoroacetyl-acetone-H, dpm = 2,2,6,6-tetramethyl 3,5-heptane dione-H.

30 citations


Journal ArticleDOI
TL;DR: Seed oil of Phyllanthus niruri (Euphorbiaceae) contains 1.2% ricinoleic (12-hydroxy-cis-9-octadecenoic) acid as discussed by the authors.
Abstract: Seed oil ofPhyllanthus niruri (Euphorbiaceae) contains 1.2% ricinoleic (12-hydroxy-cis-9-octadecenoic) acid, previously unknown in the genusPhyllanthus. Identification is based on thin layer and gas liquid chromatography, infrared, nuclear magnetic resonance, and mass spectrometry analysis as well as chemical methods. Other major components of the oil are linoleic acid (21%) and linolenic acid (51.4%).

26 citations


Journal ArticleDOI
TL;DR: In this paper, the mixed convection in a two-dimensional line heat source is studied for the situations where buoyancy effects are favorable or adverse with respect to the oncoming vertical stream.
Abstract: The mixed convection in a two-dimensional line heat source is studied for the situations where buoyancy effects are favourable or adverse with respect to the oncoming vertical stream The problem is analysed in terms of two co-ordinate expansions, direct and inverse, valid for small and large values of streamwise distance from the heat source The solution for the first eleven and seven terms in direct and inverse co-ordinate expansions, respectively, are obtained The direct expansion, when suitably transformed by Euler transformation and other techniques, predicts the velocity and temperature to two-digit accuracy for all values of streamwise coordinates, with a maximum error of 0·1% for velocity, 0·8% for temperature and 2·2% for displacement thickness far downstream from the source

25 citations


Journal ArticleDOI
TL;DR: In this article, the range of electrons and positrons of kinetic energy ranging from 0.25 to 5.0 MeV were calculated considering their total inelastic and the multiple Coulomb elastic scattering with the atomic and the nuclear fields of the atoms of an absorbing material.
Abstract: The practical ranges of electrons and positrons of kinetic energy ranging from 0.25 to 5.0 MeV are calculated considering their total inelastic and the multiple Coulomb elastic scattering with the atomic and the nuclear fields of the atoms of an absorbing material. The electrons and positrons are assumed to travel along the direction of incidence until they lose energy to the extent that the calculated mean-square projected angle due to the multiple scattering, on the plane containing the initial direction, becomes so large that their further motion becomes random. The random motion contributes to straggling only. The calculated ranges of electrons and positrons are found to explain satisfactorily the energy dependence and the material dependence of the experimental extrapolated ranges. The ratio of the measured positron range at 1.88 MeV to electron range at 1.77 MeV in Al, Cu, Sn, Yb, and Pb agrees well with the calculation. But there is a large difference in the calculated and experimental ratio of positron to electron range in some rare-earth elements and graphite.

21 citations



Journal ArticleDOI
TL;DR: In this article, a novel ligand, potassium tetrakis(1-indazolyl)borate has been synthesized from potassium borohydride and indazole at 215°C in a closed assembly.
Abstract: A novel ligand, potassium tetrakis(1-indazolyl)borate has been synthesized from potassium borohydride and indazole at 215°C in a closed assembly. Complexes of this newly synthesized chelate have been prepared with Cu(II), Ni(II), Co(II), Mn(II) and Fe(III) halides. These have been characterized by elemental analysis, IR, reflectance spectra, room temperature magnetic susceptibility- and conductance measurements. Except for the Cu(II) complex, these complexes appear to have an octahedral structure. The molar conductance value of 10−3M solutions of all complexes, except the Ni(II) complex, support nonionic species. B and 10 Dq values have been calculated where appropriate.

19 citations


Journal ArticleDOI
TL;DR: In this paper, a simple approach to ion exchange equilibria on ferric antimonate has been applied and the values of selectivity coefficients for Ba2+, Mg2+, Ca2+ and Sr2+ have been measured using equilibrium experiments at constant ionic strength and at different temperatures from 20 to 60°C

17 citations


Journal ArticleDOI
TL;DR: Two new inorganic ion-exchange materials, Zr(IV) and Ti(IV), arsenophosphates, have been synthesized and their tentative structures have been proposed based on pH titrations, thermogravimetry, chemical analysis, and IR studies as mentioned in this paper.
Abstract: Two new inorganic ion-exchange materials, Zr(IV) and Ti(IV) arsenophosphates, have been synthesized. They are reproducible in behavior and possess excellent thermal stability. Their tentative structures have been proposed based on pH titrations, thermogravimetry, chemical analysis, IR studies, and other ion-exchange properties. Distribution studies of some metal ions have also been made on the basis of which several useful binary separations have been achieved such as Fe(III) from VO(II), Cu(II), and Zn(II); Pb(II) from Cu(II), Hg(II), and Zn(II); Ti(IV) from UO2(II) and Ce(IV); and Mg(II) from Sr(II) and Ba(II).

17 citations


Journal ArticleDOI
TL;DR: A new alkaloid has been isolated from the heartwood of Ailanthus giraldii and its structure determined as 1-hydroxycanthin-6-one as mentioned in this paper.

Journal ArticleDOI
TL;DR: The hydrodynamic properties of mushroom tyrosinase were determined at pH 6.5 using a Sephadex G-200 column as mentioned in this paper, which suggests a globular conformation of this enzyme.

Journal ArticleDOI
01 Nov 1981
TL;DR: In this article, an extension of the Thompson-Lampard theorem and its application for the measurement of resistivity of conducting materials is presented, and experimental results with an aluminium sheet are also included.
Abstract: An extension of the well-known Thompson-Lampard theorem and its application for the measurement of resistivity of conducting materials is presented in this paper. Experimental results with an aluminium sheet are also included.

Journal ArticleDOI
TL;DR: In this article, the authors evaluated the randomness in the occurrence of lithologies in a cyclical succession in terms of entropies which can be calculated from a Markov chain matrix.
Abstract: Randomness in the occurrence of lithologies in a cyclical succession is evaluated in terms of entropies which can be calculated from a Markov chain matrix. Two types of entropies are linked with every lithologic state; one is the entropy before deposition E(pre)and the other is that after deposition E(post),which together form an entropy set. The entropy sets for pebbly sandstone, sandstone, shale, and coal for the Karharbari coal measures, and sandstone, shale, carbonaceous shale, and coal for the Barakar coal measures were plotted separately and compared with Hattori's idealized plots. These coal measures probably were essentially of symmetrical cyclical pattern (Type-B)of Hattori. The entropy of the whole sedimentation unit readily fits under the broad framework of fluvial cycles.

Journal ArticleDOI
15 Oct 1981-Lithos
TL;DR: In this article, it was inferred that the Chamoli Volcanics with an oceanic tholeiite affinity were probably erupted as a result of initial rifting in the Proto-Tethys, which at that time was an intercontinental sea.


Journal ArticleDOI
TL;DR: It is suggested that snail track degeneration is either a variant of or an early stage of lattice degeneration, and long-term follow-up of eyes with snail track deterioration is essential to detect any morphologic alteration in the lesions suggesting lattICE degeneration.

Journal ArticleDOI
TL;DR: In this paper, a linear regression model with random coefficients is considered and the estimation of the mean of the coefficient vector is considered, in turn involving the variances of random coefficients.
Abstract: For a linear regression model with random coefficients, this paper considers the estimation of the mean of coefficient vector which, in turn, involves the estimation of variances of random coefficients. The conventional estimation methods for it sometimes provides negative estimates. In order to circumvent this kind of difficulty, a proposal is forwarded and is examined in the light of existing ones.

Journal ArticleDOI
TL;DR: A currently active rock glacier with a snout elevation of 4055 m was observed in the Jammu and Kashmir Himalaya as discussed by the authors, its formation is ascribed to stagnation of the terminal area of a true glacier.
Abstract: A currently active rock glacier with a snout elevation of 4055 m was observed in the Jammu and Kashmir Himalaya Its formation is ascribed to stagnation of the terminal area of a true glacier

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the mechanism of transport of simple metal ions through a parchment supported cupric orthophosphate membrane in contact with various alkali metal chlorides at different concentrations and temperatures and concluded that the membrane is weakly charged and ionic species retain their hydration shell, at least partially, while diffusing through the membrane pores.

Journal ArticleDOI
TL;DR: In this paper, the i.r. spectra of lithium ammonium sulphate have been measured at 463, 300, 170 and 30 K covering all the phases of its structure.

Journal ArticleDOI
TL;DR: In this article, it was shown that GIIA H is a Hausdorff topological group with central amalgamation, and necessary and sufficient conditions for it to be a complete metric group, a Baire space, and a maximally almost periodic group.
Abstract: In Free products of topological groups with central amalgamation. I, we introduced the notion of amalgamated free product of topological groups and showed that if A is a common central closed subgroup of Hausdorff topological groups G and H, then the amalgamated free product G IIA H exists and is Hausdorff. In this paper, we give an alternative much shorter (but less informative) proof of this result. We then proceed to describe the properties of GIIA H. In particular, we find necessary and sufficient conditions for GIIA H to be a locally compact Hausdorff group, a complete metric group, and a maximally almost periodic group. Properties such as being a Baire space and connectedness are also investigated. In the case that G, H and A are k -groups, the topology of G II A H is fully described. A consequence

Journal ArticleDOI
08 Sep 1981-Wear
TL;DR: In this paper, the generalized Reynolds equation governing the pressure distribution for a micropolar lubricant in a dynamically loaded porous journal bearing is derived and applied to one-dimensional squeeze film journal bearings operating under a cyclic load.

Journal ArticleDOI
TL;DR: In this paper, the synthesis of Sn(IV) phosphosilicate as a new, reproducible and stable inorganic ion-exchanger has been discussed and a number of binary separations of analytical importance have been achieved.
Abstract: This paper deals with the synthesis of Sn(IV) phosphosilicate as a new, reproducible and stable inorganic ion-exchanger. The composition, ion-exchange capacity for different metals, pH titrations, chemical stability, distribution and IR studies have also been performed on a sample of this material. On the basis of distribution studies, a number of binary separations of analytical importance have been achieved. The limits of separations have also been determined by taking various ratios of the two components.

Journal ArticleDOI
TL;DR: In this article, the microgram detection and determination of picric acid with sodium hypochlorite solution is based on its oxidation in alkaline solution and chlorination with excess of chlorine present in hypochemically enriched solution.

Journal ArticleDOI
TL;DR: In this article, a method for synthesis of 6-ones and chlorohydrins along with the synthesis of π-chloro-oximes have been achieved, which can be used either directly or in combination with a suitable metal.

Journal ArticleDOI
TL;DR: Ten species of Epitranus Walker (Epitraninae) collected from India are described as new, viz. perticeilus, kashmiriensis, nigrus, acuminatus, indicus, meiogenus, giganticus, simptexus, areolatus and rosicorpus.
Abstract: Ten species of Epitranus Walker (Epitraninae) collected from India are described as new, viz. perticeilus, kashmiriensis, nigrus, acuminatus, indicus, meiogenus, giganticus, simptexus, areolatus an...

Journal ArticleDOI
01 Jan 1981-Toxicon
TL;DR: The effect of Russell's viper venom (2.0 mg/kg i.p.) was studied on the rate of lipid peroxidation in mouse liver, heart, lung, kidney and regions of the brain to find out the maximum elevations and lowest elevations.