| The Design and Implementation of a Parallel Unstructured Euler Solver Using Software Primitives |
MAR 92 |
26 pages |
| Authors:
R. Das; D. J. Mavriplis; J. Saltz; S. Gupta; R. Ponnusamy; INSTITUTE FOR COMPUTER APPLICATIONS IN SCIENCE AND ENGINEERING HAMPTON VA
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 | This paper is concerned with the implementation of a three- dimensional unstructured-grid Euler-solver on massively parallel distributed- memory computer architecture The goal is to minimize solution time by achieving high computational rates with numerically efficient algorithm. An unstructured multigrid algorithm with an edge-based data-structure has been adopted, and a number of optimizations have been devised and implemented in order to accelerate the parallel computational rates. The implementation is carried out ... |
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| A Study of Reversion Behaviour in 8090 Alloys Using Small Angle Neutron Scattering and Transmission Electron Microscopy |
92 |
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| Authors:
P. D. Pitcher; R. J. Stewart; S. Gupta; DEFENCE RESEARCH AGENCY FARNBOROUGH (UNITED KINGDOM) AEROSPACE DIV
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 | The distribution of delta prime precipitates in 8090 Al alloy before and after reversion aging was studied using small-angle neutron scattering and TEM. Reversion aging significantly reduced the number of smallest scattering sites, delta prime precipitates or their precursors and also the volume fraction of delta prime precipitates. This is responsible for the significant increase in toughness after reversion aging by decreasing the tendency for planar deformation in the matrix. ... |
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| Effects of Cholinergic Perturbations on Neuromotor - Cognitive Performance |
SEP 88 |
33 pages |
| Authors:
E. H. Ellinwood; A. M. Nikaido; S. Gupta; D. G. Heatherly; J. K. Nishita; DUKE UNIV MEDICAL CENTER DURHAM NC
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| In a continuing effort to document, systematically, the dose dependent effect of atropine in man (in the absence of an organophosphate challenge), we have evaluated a new series of cognitive-neuromotor tasks. In the confusion of military encounters in a combat environment, large numbers of personnel could potentially self-administer 2.0-6.0 mg of atropine when there is a misinterpretation of events and/or there is an over-reaction resulting in multiple injections within a ... |
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| Effects of Cholinergic Perturbations on Neuromotor - Cognitive Performance |
SEP 88 |
62 pages |
| Authors:
E. H. Ellinwood; A. M. Nikaido; S. Gupta; D. G. Heatherly; J. K. Nishita; DUKE UNIV MEDICAL CENTER DURHAM NC
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| Atropine dosing ranging from 0.5 to 4.0 mg demonstrated significant cognitive-neuromotor impairment effects in the 2.0 and 4.0 mg dose. The effects shown after the 4.0 mg dose was of a much greater magnitude and duration than that of the 2.0 mg dose. However, all dose of atropine induced significant tachycardia which declined much more rapidly than performance measures. The pharmacokinetics of I.M. atropine can be best described by a ... |
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| 'WATER LINE' AND 'ABOVE WATER LINE' CORROSION OF STAINLESS STEEL (AISI 321) IN H(SUB 2)SO(SUB 4) AND ITS INHIBITION, |
APR 1987 |
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| Authors:
A. DHIRENDRA; S. Gupta; G. N. Pandey; B. Sanyal
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| WATER LINE CORROSION is an important phenomenon which occurs at the boundary of the three phases is a result of the phase boundary, and is in no way limited to water as a fluid. Different deviations account for this particular type of corrosion. Such a type of attack was studied with stainless steel (AISI 321) and sulfuric acid as the fluid. The possibility of attack was expected because of differential ... |
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| Determination of Corrosion of Stainless Steel (AISI 304) by Mixed Vapours of HCl and HNO(sub 3) |
APR 86 |
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| Authors:
S. Gupta; M. Vajeyi; Dhirendra; G. N. Pandey
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| The Mylius technique works well for many exothermic reactions in acid/metal systems in immersed conditions. In this paper the extent of corrosion of stainless steel exposed over mixed vapors of HCl and nitric acid has been evaluated using the technique. It was found necessary to fix some experimental variables such as initial temperature and volume of acid solution to obtain uniform results. The maximum rise in temperature as well as ... |
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| Effect of Velocity on Corrosion of Stainless Steel in Sulphuric Acid |
JUN 84 |
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| Authors:
S. Gupta; Dhirendra; G. N. Pandey
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| The nature of attack on the metal surface by an electrolyte is different in a static condition from the condition where either the liquid or the metal is in motion. The greater accessibility of oxygen at higher velocity may increase or decrease the rate of attack depending on the nature of a metal. In the present communication either the metal, stainless steel, was stationary and the liquid (sulfuric acid solution) ... |
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| The Exothermic Reaction of Stainless Steel (AISI 304) in Mixtures of HCl and HNO(sub 3), and the Inhibition of Its Corrosion |
FEB 83 |
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| Authors:
S. Gupta; Y. Kumar; Dhirendra; B. Sanyal; G. N. Pandey
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| The reaction between some metals and mixtures of acids with or without other salts is exothermic. The character of corrosion in such systems is unpredictable due to interaction between the various acids, and with the metals. Many inhibitors which are effective in single acids fail in above-mentioned systems. The behavior of stainless steel (AISI 304) in mixtures of hydrochloric and nitric acids has been investigated. The effect of inhibitors on ... |
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| Effect of Potassium Iodide on the Attack of Stainless Steel by Sulfuric Acid |
AUG 82 |
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| Authors:
S. Gupta; G. N. Pandey; B. Sanyal
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| Although halide ions are usually considered corrosion accelerators, they sometimes act as inhibitors, particularly in strong acid solutions. The corrosion resistance of 18Cr8Ni0.5Ti stainless steel (AISI 321) has been determined in sulfuric acid solutions between 1 and 15N, containing iodide ions as K1 ranging from 10(super-5) to 3N. Iodide produces a substantial reduction in corrosion rates, when present in only trace amounts in strong acid solutions (10N). The inhibitive efficiency ... |
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| Inhibition of Corrosion of Stainless Steel in Hydrochloric Acid by 8- Hydroxyquinolene |
OCT 81 |
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| Authors:
S. Gupta; Dhirendra; B. Sanyal; G. N. Pandey
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| Stainless steel, straight chromium or 18/8 types, are attacked by hydrochloric acid. 8-hydroxyquinolene has been found to be an effective inhibitor for corrosion of stainless steel (AISI 304) in hydrochloric acid in all practical conditions. Rectilinear Arrhenius plots were obtained both in presence and absence of the inhibitor. The inhibitor remained effective at higher temperatures and for longer test durations. The present communication also deals with the polarization studies in ... |
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| Application of Sand Wick in a Housing Project |
1969 |
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| Authors:
A. G. Dastidar; S. Gupta; T. K. Ghosh; JOURNAL ARTICLE-UNIDENTIFIED SOURCE
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| An extensive area on the north-eastern part of Calcutta has recently been reclaimed from a marshy area by hydraulically placing 3 to 6 ft. of fine river sand. Exploration in a plot of land in this area for a group of 24 four-storeyed buildings revealed very poor properties of the subsoil. A new type of sand drain, invented recently, appeared to be the most economical method of solving the foundation ... |
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