Browsing by Author "G.P. Mishra"

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Bistability and electrokinetic oscillations
(Academic Press Inc., 1999) R.P. Rastogi; G.P. Mishra; P.C. Pandey; Kanchan Bala; K. Kumar
Nonlinear dynamic behavior and electrokinetic oscillations have been investigated for the membrane systems (a) 0.1 N NaCl/KCl parallel with Millipore filter parallel with 0.01 N NaCl/KCl; (b) 0.1 N NaCl/KCl parallel with Whatman Inorganic filter parallel with 0.01 N NaCl/KCl; and (c) 0.1 N NaCl/KCl parallel with silver-coated filter parallel with 0.01 N NaCl/KCl, from the viewpoint of testing the theories for the phenomena and elucidating the mechanism. To achieve these objectives, studies on hydrodynamic permeability, electroosmotic permeability, bistability, and electrokinetic oscillations were undertaken. Relaxation time for buildup and decay of electroosmotic pressures was experimentally determined. Bistability was not observed showing that it is not a prerequisite for oscillations and nonlinear relations between (J(v))(Δρ=0) and ΔΦ involving cubic or higher-order terms are necessary for bistability. The oscillations were studied at different current strengths. The period is found to be independent of current, while amplitude A is found to be linearly related to current I which is the bifurcation parameter. The bifurcation point occurs at ~0.4 mA. Studies have also been made with membranes of different pore size that show that amplitude increases with increase in pore size of the membranes. The validity of the two-variable model of Teorell was examined by comparing the experimental results with computer simulation based on parameters determined experimentally. Theory does not meet expectation and the results suggest that modification of theory is needed. The weakness of the theory has been critically examined.
Recovery of the electrical insulation of a van de Graaff accelerator's charging belt by vacuum drying
(1985) V. Shrinet; N.L. Singh; S.K. Agrawal; G.P. Mishra; A.K. Nigam
The insulation of a moisture exposed “leaky” charging belt of AN-400 Van-de-Graaff Accelerator was successfully restored by vacuum drying. Although the drying time is of nearly one week, the technique is comparatively easy, risk free and superior to other alternative techniques and does not require dismantling of the belt. Copyright © 1986 by The Institute of Electrical and Electronics Engineers, Inc.
The A-X and the B-X systems of the CuBr molecule
(1981) G.P. Mishra; R. Tripathi; S.B. Rai; K.N. Upadhya; D.K. Rai
[No abstract available]