Showing papers by "Government of India published in 1982"
TL;DR: A combined analysis of ground gravity and magnetic data with Landsat linears and surface-cum-satellite gravity data in India has enabled identification of two mega-linesaments, one trending northwesterly, the west-central India mega-lineament, and the other trending east-northeasterly, Tapi-Narmada-Son mega lineament as mentioned in this paper.
25 citations
TL;DR: In this article, the first three natural frequencies and the corresponding mode shapes for fixed-base frame-wall systems are presented, modelled as a continuum of uniform properties incorporating the shear deformation in the wall, and the resulting fourth-order homogeneous differential equation in terms of lateral displacement is solved exactly using an appropriate numerical technique.
Abstract: The first three natural frequencies and the corresponding mode shapes for fixed-base frame-wall systems are presented. The system is modelled as a continuum of uniform properties incorporating the shear deformation in the wall. The resulting fourth-order homogeneous differential equation in terms of lateral displacement is solved exactly using an appropriate numerical technique. The results are presented for various combinations of the two nondimensional parameters which together incorporate all the geometric and material properties of the frame-wall system. The mode shapes are presented in terms of the first three normal modes of a uniform slender cantilever. The nondimensional base shears appropriate for the response spectrum analysis of the system under seismic loading are also given.
14 citations
TL;DR: In this paper, an experimental procedure is enumerated for determining load-contact relations in interference/clearance fits, using photoelastic models and applying a technique for detecting progress of separation/contact up to predetermined locations.
Abstract: Interference fits are used extensively in aircraft structural joints because of their improved fatigue performance. Recent advances in analysis of these joints have increased understanding of the nonlinear load-contact and load-interfacial slip variations in these joints. Experimental work in these problems is lacking due to difficulties in determining partial contact and partial slip along the pin-hole interface. In this paper, an experimental procedure is enumerated for determining load-contact relations in interference/clearance fits, using photoelastic models and applying a technique for detecting progress of separation/contact up to predetermined locations. The study incorporates a detailed procedure for model making, controlling interference, locating break of contact up to known locations around the interface, estimating optically the degree of interference, determining interfacial friction and evaluating stresses in the sheet. Experiments, simulating joints in large sheets, were carried out under both pin and plate loads. The present studies provide load-separation behavior in interference joint with finite interfacial friction.
5 citations
TL;DR: In this article, a mathematical technique is developed for analyzing the stability analysis in terms of effective stresses, which is transcribed as a minimization problem in the calculus of variations, and the critical slip surface associated with the minimum factor of safety is obtained.
Abstract: A mathematical technique is developed for analyzing the stability analysis in terms of effective stresses. The stability equations are obtained based on limiting equilibrium conditions. The factor of safety defining the stable state of equilibrium is derived with respect to shear strength and follows Coulomb-Mohr failure criterion. The analysis considers the influence of effective inter-slice forces, and makes no a priori assumption regarding the shape of the slip surface, internal stress distribution or on the point of application of horizontal effective thrust line. In this method the stability analysis is transcribed as a minimization problem in the calculus of variations. Using this the critical slip surface associated with the minimum factor of safety is obtained. The numerical solutions obtained by the variational technique showed that the technique can be more appropriately utilised for the rigorous stability analysis of slopes. The slip-surface obtained by variational technique resembles more closely to logarithmic spiral. The analysis satisfies all equilibrium, boundary necessary and sufficient conditions. For the existence of a minimal, the functional is verified for Legendre and Weierstress conditions of positive definiteness and global extremal.
3 citations
TL;DR: A two-state Markov model of the zero-crossing model for "clicks" is given and this is an alternative approach to Rice's "Clicks" analysis and offers better physical insight into FM threshold.
Abstract: Stumpers' idea of "zero-crossing FM detection" has been extended to analyze the phenomenon of FM threshold. The physical insight into FM threshold. In the subthreshold region, the position and number of zero-crossings is used to derive various formulas for calculation of noise power due to clicks in the presence of narrow-band Gaussian noise forthrightly. A two-state Markov model of the zero-crossing model for "clicks" is given. Thus, this is an alternative approach to Rice's "clicks" analysis and offers better physical insight into FM threshold. In the subthreshold region, the experimentally determined curves are better approximated by the zero-crossing model than by Rice's model.
2 citations
1 citations
TL;DR: In this paper, the Department of Environment has initiated workshop for top level managers for sensitizing them to environmental management concepts and the experience in organizing and conducting such programmes may be of value to organizations in other developing countries, and summarised in this paper.
1 citations
TL;DR: The Indian Census Organization is internationally known for its cartographic literature and coverage as discussed by the authors, and the first Census Atlas series was brought out during 1961 Census and in the 1971 period this programme was strengthened and in addition, materials drawn from updating of jurisdictions were published in diversified cartographic forms.
Abstract: The Indian Census Organization is internationally known for its cartographic literature and coverage. The first Census Atlas series was brought out during 1961 Census. In the 1971 period this programme was strengthened and in addition, materials drawn from updating of jurisdictions were published in diversified cartographic forms. A programme has been added in 1981 Census activities on regional mapping to interpret population data leading to cartographic evaluation in its regional frame. This paper tries to focus attention in these cartographic developments and research to all concerned.