Showing papers by "Bharathiar University published in 1985"

Global and local controllability of nonlinear systems

Abstract: Sufficient conditions are established for the global and local controllability of nonlinear systems of the form x(t) = A(t, x(t), x(t))x(t) + B(t, x(t), x(t))u(t) + f(t, x(t), x(t), u(t)). The results are obtained using the measure of noncompactness of a set and Darbo's fixed point theorem.

Double sampling plans indexed by point of control and inflection point

Abstract: Three tables for selection of single sampling plans with any one of the following combinations of entry parameters are givens. 1) the indifference quality level and the average outgoing quality limit. 2) the indifference quality level with relative slope of the OC curve at that quality leve land. 3) the quality level corresponding to the inflection point with relative slope of the OC curve at that quality level. A table enabling the transition from one set of parameters to match the OC curve of other similar sets is also given.

Disruption of circadian rhythm of tissue respiration in Channa striatus by Metasystox.

Abstract: Oxygen consumption of gill, brain and muscle tissues ofChanna striatus exhibits a clearcut circadian rhythm with a maximum uptake at 18.00 h. Metasystox exposure decreased the oxygen consumption of all tissues. Maximum reduction is noted in gill followed by brain and muscle. The peak period of oxygen consumption is also eliminated in the pesticide-treated fish.

Breakdown in titanium oxide thin film capacitors

Abstract: Etude de l'influence de l'epaisseur et de la temperature sur l'intensite des champs de disruption electrique

Alcoholism Management: Hypersensitization Technique

Abstract: Aversive experiences created in therapies for alcoholism management could not be fully internalized and endured by patients because the aversive agents (electric shock, antabuse, emetics) are not natural. With the use of the natural agent, alcohol, a naruralrejection-response of the human body, emesis, could be induced to hypersensitize a patient to alcohol. An alcoholic aged 62 yr., with 43 yr. of drinking history. after screening was treated with the following hypersensitization technique under medical supervision. Treatment was given in early morning after overnight starvation. During treatment the patient sac with eyes closed to help him internalize the aversive experiences. He was asked to drink a glass of water (200 ml.) slowly sipping and enjoying each sip. This was followed by two more glasses and further doses of water were mixed with increasing quantities of arrack (5, 10, 20, 40, 80, 160, 200, 200 ml.). He drank slowly but continuously. He felt nausea at the introduction of arrack and vomited 12 times during the session of 75 min. with 11 doses. Posttreatment nausea and vomiting persisted for 36 hr. and even liquid inrake was not possible. But there was no dehydration. Aversion to alcohol induced by this treatment resulted in abstinence over 8 mo. To reduce the severity of posttreatment reactions the level of alcohol was slowly raised (10 ml. per dose) for ocher cases. Such a modification was effective when three or four sessions were given on alternate days. Each session was terminated after 12 instances of vomiting (rejection of 1500-2000 ml. of liquid). As sessions progressed onser of vomiting appeared earlier and posttreatment vomiting increased in frequency. The gradual increase in alcohol concentration and the concomminant intensification of nausea and vomiting form a strong conditioning link which sustains the rejection of alcohol. This can be referred to as the development of an experimentally induced allergy to alcohol. A typical patient after such treatment experienced nausea and vomiting on encountering a drunken mn and even the therapist. Development of this new technique was stimulated by a similar hypersensitization technique used in extinction of smoking (1). The effectiveness of these procedures with limited cases requires further confirmation with larger numbers of persons and longer periods of follow-up.

Bang-bang control of a second order nonlinear unstable plant with fourth order nonlinearity

Abstract: In this paper the design of a controller for a relay controlled second order nonlinear unstable plant with fourth order nonlinearity is considered. The task of the controller is the simultaneous reduction of output and output derivative to zero with the input being at zero. It is established that, if the initial values of error and error derivative fall in a “controllable region”, it is possible to reduce error and error derivative to zero simultaneously and in the shortest possible time with at most one switching reversal of the relay. It is also shown that, through simple transformation of error and error derivative, the equation of the switching curve can be made independent of the constant gain of the plant, as well as the coefficient of the nonlinear term.

Perception of self among first- and second-generation entrepreneurs

Abstract: A few typologis of entrepreneurs have been proposed. One such typology by Venkatapathy (1983b) classified enrrepreneurs into first and second generations. The former refers to individuals who initiate their own ventures for which there was no precedence and the latter to individuals who adopt or take over ventures already established by a member of their family or relatives. It was hypothesized that the two groups of entrepreneurs would differ in perceptions of self on an affective dimension. Twentyfive concepts denoting an affective dimension of self were to be sorted using Q-methodology on an 11-point rating scale. Analysis showed that the 57 first-generation enrrepreneucs were significantly (p 6 .05) less impulsive, insecure, shy, and gloomy and also less sensitive, more problematic, artistic and moody than the 44 second-generation entrepreneurs. The two groups did not differ on dieerful, stable, informal, innocuous, self-centered, brave, poetic, excitable, subservient, nervous, motionless ocean, sober, social, complex, cruel, selfconscious and sportive. The first-generation group were older, highly educated, opting to promote selfemployment, had healthy childhood experiences, had more friends, showed social involvement and awareness, felt training was more essential than education and their filial position most often was first relative to the second-generation group (Venkatapathy, 1983a). It was concluded that the first- and second-generation entrepreneurs differed in their perceptions of self.

Comment on j.-y. parlange, m. j. guilfoyle, and r. e. rickson's "mortality levels and family fertility goals"

Abstract: Parlange Guilfoyle and Rickson (1983) in attempting to highlight the problem of ecological fallacy in the estimation of family fertility rates from the expected probability of a child surviving to a given age of a parent tried to examine Krishnamoorths (1979) model. The authors agree with Parlange et al. in principle that due consideration to homogeneous subgroups makes the group that is under study more representative of an individual family and hence a more accurate predictor of its behavior. But in their attempt to refine Krishnamoorths model to demonstrate this they have made mistakes in mathematical logic. Parlange et. al. introduce order-specific birth rates into the model so that the model deals with a probability density. The authors maintain that Parlanges formulation of the probability that a father of a given age has his 1st son already dead is incorrect. The 2nd major drawback in their model is that there is no provision for the natural condition that the ith son cannot be born before the (i - 1)th son. The basic problem in Krishnamoorthys (1979) model according to Parlange et al. is that it is formulated in terms of the average family in the population rather than the individual couple. Krishnamoorthy (1980) attempted to rectify this by developing a model using a nonhomogeneous Poisson process which is not free from stringent assumptions. The correct solution to the problem can be obtained only when a model incorporates the joint probability density of ages of fathers at births of sons of different order. Such an attempt would be purely academic since joint distributions are hardly available for any population.

Polymerization of acrylamide initiated by copper(II) amino acid chelate-CCl4 systems III.

Abstract: It was found that copper(II) amino acid chelates initiate polymerization of acrylamide thermally, in the presence of CCl4. Amino acids used were glutamic acid, serine and valine. Analysis of the results shows that at lower concentrations of the initiator the rate of polymerization is proportional to [initiator]1/2 and [monomer]3/2. At higher concentrations of the initiator polymerization was found to be inhibited. Kinetics indicate a radical mechanism of polymerization. The initiating radicals seem to be · CCl3 radicals, that are formed between CCl4 and “a loose adduct” resulting from the complex and the monomer. The effect of temperature was also studied. A possible reaction scheme is proposed to explain various reactions occurring in polymerization. Thermal initiation efficiencies of these chelates were found to be much greater than their photochemical counterpart in the absence of CCl4.

Conditional Double Sampling by Variable

Abstract: Conditional double sampling procedures with operating characteristic curves identical to the usual double sampling procedures are proposed for variables data. These procedures are straight forward extensions of conditional double sampling procedures for..