Showing papers by "Indian Institute of Technology Bombay published in 1982"
TL;DR: In this paper, the bending behavior of a rectangular plate is analyzed with the help of a refined higher-order theory, based on a higher order displacement model and the three-dimensional Hooke's laws for plate material, giving rise to a more realistic quadratic variation of the transverse shearing strains and linear variation of transverse normal strain through the plate thickness.
204 citations
TL;DR: In this paper, a general finite element formulation for plate bending problem based on a higher-order displacement model and a three-dimensional state of stress and strain is attempted, which incorporates linear and quadratic variations of transverse normal strain and transverse shearing strains and stresses respectively through the thickness of the plate.
151 citations
TL;DR: In this paper, a review article discusses, from a unified standpoint, three current approaches in applied quantum mechanics that adopt the single-particle density as a basic variable, viz. density-functional theory (DFT), quantum fluid dynamics (QFD), and study of the properties of a system through local quantities in 3D space.
146 citations
TL;DR: In this paper, a comparison of sedimentation rates obtained by 210Pb and pollen analyses of 1-m cores collected throughout the Potomac Estuary show good agreement in the majority of cores that can be analyzed by both methods.
94 citations
TL;DR: In this paper, high transparent and conducting SnO 2 films with low resistivity and high transmission were produced by the oxidation of SnCl 2 at relatively low temperatures using the oxygen flow rate corresponding to the minimum resistivity.
59 citations
TL;DR: Using the time-dependent extension of the Hohenberg-Kohn-Sham density-functional theory, in the presence of an oscillating electric field, a Karplus-Kolker-type variation-perturbation method for the calculation of dynamic 2 L -pole polarizability of many-electron systems was proposed in this paper.
51 citations
TL;DR: In this article, the tensile and flexural properties of unidirectional carbon/glass fiber reinforced hybrid composites having about 50% reinforcement by volume were analyzed. And the results showed uniform variation with change in the proportion of reinforcements.
37 citations
TL;DR: In this paper, the effects of variation of the boundary condition parameter and suction/injection parameter on the velocity, microrotation and temperature fields and the heat transfer coefficient have been studied graphically.
Abstract: The effect of suction/injection in the laminar free convection flow of a thermomicropolar fluid past a nonuniformly heated vertical flat plate has been considered. The conditions under which similarity exists have been examined. The resulting system of non-linear ordinary differential equations has been solved numerically after transforming the infinite domain of boundary layer coordinate into a finite domain. The effects of variation of the boundary condition parameter and suction/injection parameter on the velocity, microrotation and temperature fields and the heat transfer coefficient have been studied graphically. The skin-friction parameter and the gradient of microrotation on the wall have been tabulated. It is found that there is significant increase in velocity, skin-friction and the heat transfer coefficient with the decreasing concentration of microelements.
33 citations
TL;DR: In this paper, a rechargeable photoelectrochemical solar cell based on the n -type BaTiO 3 /Ce 3+, Ce 4+ /Fe 2+, Fe 3+ /Pt system has been made.
28 citations
TL;DR: In this article, the sign and magnitude of the exchange constants in Y3Fe5O12 have been explained on the basis of Anderson's theory of superexchange, and the low temperature magnetisation data in Dy3Fe 5O12 has been explained by assuming canting on the c sublattice.
Abstract: The exchange constants in the ferrimagnetic garnets R3 Fe5 O12 (R=Y3+, Gd3+ and Dy3+) have been obtained from the experimental data on saturation magnetisation and inverse susceptibility. The sign and magnitude of the exchange constants in Y3Fe5O12 have been explained on the basis of Anderson’s theory of superexchange. The low temperature magnetisation data in Dy3Fe5O12 have been explained by assuming canting on thec sublattice.
22 citations
TL;DR: In this paper, the Schrodinger equation for many-electron systems is transformed into a continuity equation and an Euler-type equation of motion in configuration space, and the two fluid-dynamical equations are derived in the three-dimensional space.
Abstract: In presence of external electric and magnetic fields, the Schrodinger equation for many-electron systems is transformed into a continuity equation and an Euler-type equation of motion in configuration space. Then, using the natural-orbital Hamiltonian, as defined by Adams, the two fluid-dynamical equations are derived in the three-dimensional space. This generates a "classical" view of such quantum systems, corresponding to an MCSCF wave function: The many-electron Schrodinger fluid consists of individual fluid components, each corresponding to a natural orbital and having its own charge density and current density. The local observables, viz., the net charge density and net current density, are obtained by merely summing over the natural orbitals, with the occupation numbers as weight factors; but, the net velocity field cannot be so obtained. Further, although each fluid component moves irrotationally in the absence of a magnetic field, the net velocity field is not irrotaional. The irrotational character of each velocity component is destroyed by rotation of the nuclear framework of the system while electron spin introduces an additional term, the spin magnetization moment, into each component current density. The physical significance of the fluid-dynamical equations as well as their advantages and disadvantages are discussed.
TL;DR: Poiseuille flow of a micropolar fluid has been reexamined from the point of view of its applications to blood flow and Velocity profiles as well as apparent viscosity are computed for various values of s (a boundary condition and concentration parameter).
TL;DR: In this article, the effects of unidirectional surface roughness on the response of a squeeze film between two porous rectangular plates of finite dimensions were analyzed using Fourier expansions.
Abstract: The paper describes a theoretical analysis of the effects of unidirectional surface roughness on the response of a squeeze film between two porous rectangular plates of finite dimensions. The problem is solved analytically using Fourier expansions. It is shown that the nominal geometry as characterized by the aspect ratio of the plates has a profound effect on the system.
TL;DR: In this article, a new model order selection criterion was proposed to overcome the deficiencies of the earlier methods for Davison's and Marshall's reduced order models, which are not applicable in many of the practical cases.
Abstract: This note points out that the model order selection criteria proposed earlier for Davison's and Marshall's reduced order models are not applicable in many of the practical cases. A new criterion is proposed to overcome the deficiencies of the earlier methods.
TL;DR: In this paper, the results of x-ray diffraction, magnetic hysteresis and initial susceptibility (χ) studies were analyzed for the Mg1−xCOxFe2O4(0
Abstract: Ferrites with the composition Mg1−xCOxFe2O4(0
TL;DR: In this paper, the problem of determining the stress distribution in an infinite elastic medium, containing Griffith cracks and the external cracks, is considered under the assumptions of plane strain, where the crack surfaces are subjected to completely arbitrary surface tractions and the cracks are located on a straight line (say, x-axis).
TL;DR: Anodic polarisation studies on copper matte revealed that a copper matte electrode electrode polariess abruptly in H,SO, solution but not in HCl solution as mentioned in this paper, and it was further observed that this preferential dissolution of copper takes place over a longer period (about 6 h) than in H 2 SO 4 solution (about 3 h).
Journal Article•
TL;DR: The textural study of the sand grains of Sivaganga Formation indicates that sedimentation commenced in a fluvial environment passing through the lacustrine-marsh conditions and ending with the influence of tidal estuary as discussed by the authors.
Abstract: The textural study of the sand grains of Sivaganga Formation indicates that sedimentation commenced in a fluvial environment passing through the lacustrine-marsh conditions and ending with the influence of tidal estuary. The clayey sediments in the upper part have yielded an arenaceous foraminiferal assemblage having a low dominance and diversity value belonging to the Neocomian-Aptian (Early Cretaceous) age. The sedimentary basin was formed as a result of downwarping of the crystalline basement along the prominent Eastern Ghat trend during Late Jurassic and Early Cretaceous. The basin established its fragmentary connections with the open sea situated at some distance towards the east and southeast.
TL;DR: In this article, the entertainment by a particle laden concentric jet was theoretically determined and compared with direct measurements, where the particle enhance the mixing. But the authors did not consider the effects of particle particles on the mixing process.
TL;DR: In this article, the 1∶2 complex obeys Beer's law for manganese concentration of 0.04-1.4μg per ml, has molar absorptivity 4.176 x 104 and Sandell sensitivity 0.0013μg cm−2.
Abstract: Manganese forms a red chelate with 4-(2-thiazolylazo)-resorcinol at pH 8.8 (borate buffer), and absorbance is measured after 30 s, at 540 nm in the presence of 20%tert-butyl alcohol (by volume). The 1∶2 complex obeys Beer's law for manganese concentration of 0.04–1.4μg per ml, has molar absorptivity 4.176 x 104 and Sandell sensitivity 0.0013μg cm−2. The formation constant (logK) is found to be 9.32, and relative standard deviation ±0.22%. Of the 48 ions studied for interference, only Co(II), Zn(II), Cd(II), Pb(II) and EDTA2− are found to interfere. This method has been applied for the determination of manganese content in alloy steels.
TL;DR: The possibilities of Legendre Polynomial transform for data compression are explored and a computationally fast algorithm for obtaining Legendre transforms of sequences is presented.
Abstract: The television pictures can be approximated by polynomials, so an orthogonal transform having polynomials as the basis vectors can be used for best representation of such images. The possibilities of Legendre Polynomial transform for data compression are explored in the present paper. This paper also presents a computationally fast algorithm for obtaining Legendre transforms of sequences.
TL;DR: Glycozoline and girinimbine isomers (IV andVII) were synthesized and their activity against 2 bacterial strains, viz.
Abstract: Glycozoline and girinimbine isomers (IV andVII) were synthesized and their activity against 2 bacterial strains, viz.E. coli andS. aureus, and 2 fungal strains, viz.C. albicans andA. niger were studied. The hydroxy synthons (III) were also tested.
TL;DR: In this paper, an experimental study of a two-phase concentric jet with particles in the secondary stream was carried out and it was shown that particles enhance the mixing of the mixing.
Abstract: In a two-phase concentric jet the second phase, consisting of solids, influences the development of the jet and the effect of its presence needs to be assessed quantitatively. An experimental study of such a jet with particles in the secondary stream was therefore undertaken. It is seen that particles enhance the mixing.
Dans un jet concentrique biphasique, la seconde phase formee de matieres solides influence le developpement du jet et cet effet doit pouvoir ětre etabli quantitativement. On a. par consequent, fait une etude experimentale de ce type de jet comportant des particules pour la seconde phase; on a constate que les particules augmentent le melange.
TL;DR: In this article, the effect of water on the translaminar fracture behaviour of random glass fiber reinforced polyesters was studied. But the authors focused on the non-structural properties of the polyester and did not consider the structural properties of polyesters.
TL;DR: Magnetic hysteresis and initial susceptibility of the compounds BaxLn1 -xCoO3 are measured as a function of temperature as mentioned in this paper, where Ln is La, Nd, and Sm.
Abstract: Magnetic hysteresis and initial susceptibility of the compounds BaxLn1 — xCoO3, where Ln is La, Nd, and Sm, are measured as a function of temperature. The results give clear indication of the presence of single domain magnetic clusters below room temperature.
Magnetische Hysterese und Anfangssuszeptibilitat der Verbindungen BaxLn1 — xCoO3, wobei Ln La, Nd und Sm bedeutet, werden als Funktion der Temperatur gemessen. Die Ergebnisse geben einen klaren Hinweis auf die Anwesenheit von magnetischen Ein-Domanen-Clustern unterhalb Zimmertemperatur.
TL;DR: In this paper, the effect of some environments (distilled water, salt water and dilute hydrochloric acid) on the tensile strength and fracture toughness of random glass fibre reinforced polyester (GRP) was studied.
TL;DR: The Seebeck voltage of the ceramic solid solutions of the system Pb2−x Lax Li0·5 Nb1·5 O6+δ has been studied as a function of temperature and concentration of lanthanum as mentioned in this paper.
Abstract: The Seebeck voltage of the ceramic solid solutions of the system Pb2−x Lax Li0·5 Nb1·5 O6+δ has been studied as a function of temperature and concentration of lanthanum. The thermoelectric power was strongly dependent on the temperature and doping amount of lanthanum.