Showing papers by "Indian Institute of Technology Kharagpur published in 1977"
1,408 citations
TL;DR: The qualitative terms of the alternatives are represented quantitatively using fuzzy sots and then the fuzzy optimal alternative is computed and gives the relative merit of each alternative and thus helps in decision making.
Abstract: In many situations one has to find the best alternative on the basis of many aspects which have varying degrees of importance. The problem is more complex if the ratings of the alternatives and the importance of the aspects are expressed using qualitative variables like good, fair, very important, etc. This paper presents a method for decision making in such situations. The qualitative terms are represented quantitatively using fuzzy sots and then the fuzzy optimal alternative is computed. The fuzzy set representing the optimal alternative gives the relative merit of each alternative and thus helps in decision making.
253 citations
TL;DR: A method is presented for the machine recognition of constrained, hand printed Devanagari characters, where each stage of decision making narrows down the choice regarding the class membership of the input token.
158 citations
TL;DR: In this article, the free convection flow and heat transfer between two parallel vertical walls were analyzed based on the non-linear variation of the density with temperature in the buoyancy term.
102 citations
TL;DR: A review of the ecology of reefal foraminifers and algae assumes a considerable importance in determining and delineating sub-environments of ancient reefs, especially those of non-coral origin this article.
74 citations
61 citations
TL;DR: In this paper, a similarity solution for the full Navier-Stokes equations is presented for the unsteady flow between two plates approaching or receding from each other symmetrically.
57 citations
TL;DR: In this paper, a stability analysis based on a slip surface derived from experimental results is presented for eccentrically loaded footings resting on sand, where the effective width method of Meyerhof is widely used for calculating the bearing capacity of the footings.
Abstract: Footing foundations are often subjected to eccentric loads. The problem has been studied in detail by several investigators. The effective width method of Meyerhof is widely used for calculating the bearing capacity of eccentrically loaded footings. While some of the experimental evidence supports Meyerhof.s hypothesis others report a large deviation. A stability analysis based on a slip surface derived from experimental results is presented herein for eccentrically loaded footings resting on sand.
49 citations
TL;DR: An algorithm is developed for the design of an efficient decision tree with application to the pattern recognition problems involving discrete variables by defining a criterion to estimate the minimum expected cost of a tree in terms of the weights of its terminal nodes and costs of the measurements.
45 citations
44 citations
TL;DR: In this paper, the effect of vulcanization temperature on the structure and technical properties of gum natural rubber vulcanizates with four different 2-(morpholinodithio)-benzothiazole: sulphur ratios (A, 0.6:2.4; B, 1.5:1.5; C, 2.4:0.6; D, 3.0: 0.0) at the respective optimum cure times was determined.
TL;DR: In this article, the reliability of a system with increasing failure rates improves with preventive maintenance (PM) But with imperfect PM the system may not regenerate Whether the system regenerates or not, the optimum PM intervals can be calculated This has been mathematically formulated and derived here
Abstract: The reliability of a system with increasing failure rates improves with preventive maintenance (PM) But with imperfect PM the system may not regenerate Whether the system regenerates or not, the optimum PM intervals can be calculated This has been mathematically formulated and derived here
TL;DR: In this article, the shape of folds in the main Raialo syncline was analyzed, and it was shown that the F 1 folds were formed by buckling, and were subsequently modified by flattening normal to the axial planes and lengthening along the axis.
TL;DR: In this article, the main Raialo syncline in the Udaipur district of central Rajasthan, India, has been affected by folding of four main generations (F 1 -F 4 ), the first two are seen in the scale of map to microsection.
TL;DR: In this article, the electrodeposition of aluminium on brass (63/37) from a dry AlCl3/NaCl melt (80wt.% purified AlCl 3, 20 wt.% NaCl) using static as well as rotating cathodes and a variety of conditions has been studied.
Abstract: The electrodeposition of aluminium on brass (63/37) from a dry AlCl3/NaCl melt (80wt.% purified AlCl3, 20 wt.% NaCl) using static as well as rotating cathodes and a variety of conditions has been studied. The current efficiency of the process is very high and the electrodeposits are smooth, fine grained and silver white in appearance. Although at lower temperatures, there is a tendency for flakes to be formed locally these are easily removed and do not affect the overall quality of the electroplate.
TL;DR: An analytical method taking into account the axial deformations of the members of the frame and the slip at the interface has been summarised for linear elastic behaviour of a homogeneous and isotropic infill.
TL;DR: In this article, the authors studied the wall conductance effects on the hydromagnetic flow and heat transfer between two parallel plates in a rotating frame of reference when the liquid is permeated by a transverse magnetic field.
Abstract: Wall conductance effects on the hydromagnetic flow and heat transfer between two parallel plates in a rotating frame of reference has been studied when the liquid is permeated by a transverse magnetic field. An exact solution of the governing equations has been obtained. It is found that the velocity, current density and the temperature depend only on the sum of the wall conductances φ1 + φ2 = φ but magnetic field depends on the individual values of φ1 and φ2, where φ1 and φ2 are respectively the wall conductance ratios of the upper and lower walls.
TL;DR: In this paper, the effect of some parameters on shear stress and point of separation was studied in a non-symmetric channel with continuous constriction, and the expressions for velocity, micro-rotation and axial pressure gradient were derived.
TL;DR: Hall effects on Couette flow of an electrically conducting fluid between two parallel plates for both the cases of impulsive as well as uniformly accelerated motion of one of the plates is discussed in this paper.
TL;DR: In this paper, the authors considered the Hall effects on the combined free and forced convective fully developed flow in a parallel plate channel with perfectly conducting walls and obtained an exact solution of the governing equations.
TL;DR: In this paper, the expressions for the real, imaginary parts of the input impedance seen by a coaxial line driving a thin cylindrical probe in a dominant TE/sub 11/mode circular waveguide are derived.
Abstract: The expressions for the real, imaginary parts of the input impedance seen by a coaxial line driving a thin cylindrical probe in a dominant TE/sub 11/ mode circular waveguide are derived. The analysis is carried out by assuming that the cylindrical post is replaced by a curvilinear strip having maximum width equal to the diameter of the probe. Theoretical results on input VSWR and input impedance seen by a coaxial line are in close agreement with experimental data.
TL;DR: In this paper, an analysis of coupling between a stripline and a rectangular waveguide is presented, where coupling is through small apertures in the form of a circular hole or a narrow rectangular slot.
Abstract: An analysis of coupling between a stripline and a rectangular waveguide is presented. Coupling is through small apertures in the form of a circular hole or a narrow rectangular slot. A closed form expression for the normalized field distribution in the stripline, required for the purpose of analysis, is also derived. The theoretical results show good agreement with the experimental results.
TL;DR: In this article, the critical speed of force on a sandwich beam is always greater than that on an elastic beam of identical mass per unit length and flexural rigidity, and depends on its geometric and shear parameters.
TL;DR: In this paper, the authors found that the mean velocity diagrams, the values of the mean skin friction and the expression (37) for θ are all correct, but the mean temperature profiles as shown in figures 5-7 are all incorrect.
Abstract: In the paper noted in the title we have found a few mistakes and wish to correct them in this note. First we infer from the non-dimensional temperature θ (= ( T ' - T '∞) / ( T ' w - T '∞)) and the Grashof number G (= ( T ' w - T '∞) / ∆ T with ∆ T = U v 2 / vg x β ) that T '∞ only is kept constant and as G varies so does T ' w . For example, as G , being positive, takes increasing values T ' w increases and hence the fluid subsequently gets heated up as a result of heat-balance. Consequently we expect the fluid temperatures θ (say, for a fixed Y ) to increase with positive G and to decrease with negative G and these results are not in evidence from figures 5-7 of Soundalgekar (1973), which are incorrect. That the results incorporated in and depicted by figures 5-7 cannot be all correct may be understood by a simple mathematical reasoning, namely: if E > 0, θ cannot have a minimum as shown in figure 5 because from equation (20) of the reference, θ H < 0 when θ ' = 0 and if E < 0, θ cannot have a maximum as shown in figure 7. Further it is necessary to know the quantitative nature of the errors committed in the paper. Therefore we have reworked out the problem and evaluated on I. B. M. 1620 the numerical values of the dimensionless mean velocity u , the mean skin friction τ and the mean temperature θ . We have found that the mean velocity diagrams, the values of the mean skin friction and the expression (37) for θ are all correct. But the mean temperature profiles as shown in figures 5-7 are all incorrect! The correct values of the dimensionless mean temperature θ have been presented in this note through figures 1-3. It is quite clear that θ , as expected, increases with positive G significantly in the case of air ( P = 0.71). Physically it means that as the plate temperature T ' w increases (positive G increases) the fluid-temperature increases. This behaviour of θ gets duly reversed when G , being negative, takes increasing values (see figure 3, P = 0.71). In the presence of free convection parameter G the mean temperature θ increases as the frictional heating (positive E ) increases, a result in contrast to that reported by Soundalgekar. Moreover when the Prandtl number P is large, the effect of G (positive or negative) on θ is almost insignificant - a result contrary to the one obtained by Soundalgekar.
TL;DR: In this paper, the stability of a compressible parallel shear flow permeated by an aligned magnetic field was analyzed and it was shown that the complex wave speed of an unstable wave lies in a semi-circle in the upper half plane.
Abstract: Some general results on the stability of a compressible parallel shear flow permeated by an aligned magnetic field are derived. It is shown that the complex wave speed of an unstable wave lies in a semi-circle in the upper half plane with the range of the shear flow as diameter. Further both compressibility and magnetic field are found to be stabilizing. It is also shown that in a flow near a wall, two acoustic waves carry energy away from the wall. A semi-circle theorem for a non-planar compressible shear flow is also deduced.
TL;DR: In this article, the relation between the Governing Principle of Dissipative Processes and the Lagrangian thermodynamics of Biogiotis was discussed and compared with the flux representation for heat conduction in solids.
Abstract: This note deals with the relation between the Governing Principle of Dissipative Processes and the Lagrangian thermodynamics ofBiot. The governing principle is introduced in its universal form and then the flux representation is deduced as a partial form of it for the heat conduction phenomenon. Finally, the Lagrangian thermodynamics ofBiot is introduced in its original form and it is compared with the flux representation for heat conduction in solids. It is shown that for heat conduction phenomena for which the Lagrangian thermodynamics was proposed and applied byBiot, it is equivalent to the flux representation of GPDP.