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Showing papers by "Bharathiar University published in 1984"


Journal ArticleDOI
TL;DR: A new synthesis of the pyranoquinolone alkaloids flindersine (8a), 8-methoxyflindersine(8c), N-methylflindersines (9a), zanthobunglanine (9c), oricine ( 9d), veprisine (9e ), and prenylquinolones atanine (13a), preskimmianine ( 13e), Nmethylatanine (14a), O-methylglycosolone (14c ), and N-methylpres

95 citations


Journal ArticleDOI
TL;DR: Sublethal exposure of metasystox decreased succinic dehydrogen enzyme activity and tissue respiration, while lactic dehydrogenase activity increased in gill, brain, muscle, liver, and kidney tissues of Channa striatus.

23 citations


Journal ArticleDOI
TL;DR: In this paper, sufficient conditions for global relative controllability of nonlinear systems consisting of a bilinear mode with distributed delays in control are given, based on Schauder's fixed point theorem.
Abstract: Sufficient conditions for global relative controllability, of nonlinear systems consisting of a bilinear mode with distributed delays in control are given. Results for bilinear systems with multiple delays and general nonlinear systems with distributed delays in control are stated. Proofs are based on Schauder's fixed point theorem.

15 citations


Journal ArticleDOI
TL;DR: In this article, a new and convenient synthesis of 2-isopropylfuro-(2,3-b)quinolines from 3-(3-methylbut-1-enyl)-2-quinolones was described.

11 citations


Journal ArticleDOI
TL;DR: Sufficient conditions are established for the global relative controllability of nonlinear system consisting of a bilinear mode with time-varying delays in control by using Schauder's fixed point theorem.

7 citations


Journal ArticleDOI
TL;DR: In this article, the tellurium oxide films have been formed by reactively evaporating the liquid in an r.f. discharge plasma of oxygen, revealing interesting structural changes and optical properties for the films formed.
Abstract: Tellurium oxide films have been formed by reactively evaporating tellurium in an r.f. discharge plasma of oxygen. Bias variation has been found to reveal interesting structural changes and different optical properties for the films formed. Qualitative observations regarding the physical and chemical reactions at the substrate have been reported.

4 citations


Journal ArticleDOI
TL;DR: In this paper, the stability of a radially stratified compressible fluid rotating between two coaxial cylinders is investigated and the stability with respect to axisymmetric disturbances is examined.
Abstract: The hydromagnetic stability of a radially stratified compressible fluid rotating between two coaxial cylinders is investigated. The stability with respect to axisymmetric disturbances is examined. The fluid system is found to be thoroughly stable to axisymmetric disturbances provided the fluid rotates very rapidly. The system is shown to be unstable to non-axisymmetric disturbances, and the slow amplifying hydromagnetic wave modes propagate against the basic rotation. The lower and upper bounds of the azimuthal phase speeds of the amplifying waves are determined. A quadrant theorem on the slow waves characteristic of a rapidly rotating fluid is derived. Special attention is given to the effects of compressibility of the fluid. Some results concerning the stabilitiy of an incompressible fluid system are obtained as special cases of the present analysis.

2 citations


Journal ArticleDOI
TL;DR: The present technique increases the self-induced stress to a level 'beyond' tolerance without onset of relief, and evokes hyper-sensitivity and psychophysiolog~cal inhibiton of smoking.
Abstract: The smoker by smoking a cigarette creates a certain level of 'self-induced stress' resulting from oral heat, bitter taste, and bronchio-pulmonary irritation. The termination of smoking a cigarette extinguishes this self-induced-stress and onsets a self-inducedrelief followed by some reduction in the general level of stress that existed prior to smoking. This positive experience of relief from stress has some survival value for the individual and reinforces and maintains the antecedent smoking behavior. The effective way to extinguish smoking is ro thwart or stamp out abruptly and completely the link berween self-induced stress and self-induced relief. Rapid smoking procedures have only required people to smoke 'until' tolerance ( 1, 2 ) . The present technique increases the self-induced stress to a level 'beyond' tolerance without onset of relief. One smokes until smoking is no longer a pleasurable experience. Treatment by this method of a 23-yr.-old male with a 10-yr. smoking history is described here. The treatment was given with the client's consent and after screening in a clinic. He was not aware of the treatment strategy. He was made to relax and to smoke, inhaling each puff and exhaling only through his nostrils while trying to enjoy each puff. He could not retain a feeling of 'pleasure' after the chird cigarette; he coughed on the fifth one, and vomited three times (eighth to tenth cigarettes), and lost consciousness on the fourteenth. The number of cigarettes and minutes per day to fall unconscious were 14/75, 10/36, 8/30, 45/19, 3/12, 2/9, 1/4 over one week. He spontaneously recovered consciousness after 10 to 15 min. The steep decline in the 'cigarette tolerance' was followed by an abrupt reduction in smoking outside the treatment, from 10 (pretreatment) to 1 on the first day of treatment and none from the fourth day onwards. Nonsmoking continued for seven months. Peer pressure to smoke led to a 'pleasureless/blaad' smoking experience. This STOP technique evokes hyper-sensitivity and psychophysiolog~cal inhibiton of smoking. This preliminaty work should be replicated with a large sample of heavy smokers.

1 citations


Journal ArticleDOI
TL;DR: In this paper, the authors describe the characterisation of couches par diffraction RX, mesure de l'indice de refraction, du facteur de transmission, et al.
Abstract: Caracterisation des couches par diffraction RX, mesure de l'indice de refraction, du facteur de transmission

1 citations



Journal ArticleDOI
TL;DR: In this paper, the magnetohydrodynamic stability of rotating baroclinic star has been studied in the presence of poloidal and toroidal magnetic fields taking into account the diffusive effects.
Abstract: The magnetohydrodynamic stability of rotating baroclinic star has been studied in the presence of poloidal and toroidal magnetic fields taking into account the diffusive effects. Necessary conditions for stability have been found by normal mode analysis under small wavelength approximation.

Journal ArticleDOI
TL;DR: In this article, the currentvoltage characteristics of thin-film capacitors of erbium fluoride were studied in the temperature range 323 to 396 K. Analysis of the data suggests an electrode-limited mechanism such as that suggested by Schottky.
Abstract: Thin-film capacitors of erbium fluoride were fabricated by electron beam gun deposition. The current-voltage characteristics of the erbium fluoride films were studied in the temperature range 323 to 396 K. For sufficiently high electric fields (>104 V cm−1), the leakage current increases exponentially with the square root of the applied field. Analysis of the data suggests an electrode-limited mechanism such as that suggested by Schottky. It is seen that the conduction mechanism is an activated process with the activation energy decreasing with increasing field.