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Positivity and Delinquency: Is the Glass Half Full?
Get PDFResearch from control theorist Walter Reckless has shown that positive self-image acts as an insulator from delinquency during adolescence. Current research investigates the connection between an individual’s self-perceptions and their inclination toward delinquency, hypothesizing that rates of delinquency will be lesser for an individual with a positive perception of self. Data from Wave I of the National Longitudinal Study of Adolescent Health are compared to follow-up data with participants in Wave II so reported self-image may predict subsequent delinquency. Ordered logistic regression is used to estimate the significance of self-image effects on delinquency, and probability scores for participation in delinquency have been generated based on reported levels of self-image. Variables considered include measures of self-efficacy and self-expectations, which are compared to rates of delinquency and other risk factors among the sample. Results show that positive self-image does act as an insulator from delinquency, with increasing levels of self-image significantly decreasing delinquency at the .01 level, and reducing the probability of participating in delinquent acts, supporting the research of Walter Reckless. These findings promote the development and encouragement of positive self-image during adolescence, when youth are impressionable, need guidance, and positive reinforcement
Proposing Drug Target(s) to Combat Trypanosoma brucei Infection
Get PDFBackground: Sub-Saharan African countries are plagued by an adaptable parasite, Trypanosoma brucei, T.b., with a very high iron dependency. This protozoan parasite is the causative agent for Human African Trypanosomiasis (HAT), otherwise known as sleeping sickness. Two specific subspecies of interest include T.b. gambiense and T. b. rhodesiense. They lead to either a chronic or acute form of the fatal sleeping sickness disease, respectively. Few effective methods of treatment are available. The goal of this research project is to propose pharmaceutical drug target(s) to combat T. brucei infections. Methods: Studies analyzed the reaction pathways that take place during the parasite’s life cycle, identified the natural and chemically produced superoxide radicals within the parasite, and also elucidated the differences in the parasite’s life processes will allow for the derivation of a plausible methods to cease the infection cycle of the T. brucei parasite. The impact of these factors on preventing or reducing the virulence of the infection by T. brucei was assessed using computer-aided simulation software named CLEMS, Command-Line Electro-Metabolomics Software. We monitored the concentrations of oxygen, glucose and dihydroxyacetone phosphate, DHAP, given their importance for the survival of the parasite. Oxygen concentration peaked soon after the start of the simulation before achieving steady state with a concentration comparable to that of the mammalian environment simulated; glucose concentration was constant throughout the simulation again consistent with the environment where the parasite is evolving; finally, results showed a decrease in DHAP concentration followed by steady state. Any process, which contributes to further decreasing DHAP concentration, is likely to be detrimental to the T. brucei. Other processes, such as superoxide radical degradation, will be considered in concert to the ones assessed in this study to develop suitable drug targets
The TRI-AG Academics Research Extension College Of Agriculture Sciences - Vol. 1 No.1 - 2017
Get PDFhttps://digitalcommons.pvamu.edu/pv-magazine/1011/thumbnail.jp
Conditional full support for Fractional Brownian Motion
Get PDFIn this paper we establish conditions that imply the conditional full support (CFS) property, introduced by Guasoni et al. (2008), for the processes St where BH is a Fractional Brownian motion, R is a continuous process, and the processes R and φ are either progressive or independent of BH: Moreover we build the absence of arbitrage opportunities without calculating the risk-neutral probability
Effect of Damping and Thermal Gradient on Vibrations of Orthotropic Rectangular Plate of Variable Thickness
Get PDFIn this present paper, damped vibrations of an orthotropic rectangular plate resting on elastic foundation with thermal gradient is modeled, considering variable thickness of plate. Following Le`vy approach, the governed equation of motion is solved numerically using quintic spline technique with clamped and simply supported edges. The effect of damping parameter and thermal gradient together with taper constant, density parameter and elastic foundation parameter on the natural frequencies of vibration for the first three modes of vibration are depicted through Tables and Figures, and mode shapes have been computed for fixed value of plate parameter. It has been observed that the rate of decrease of frequency parameter with damping parameter Dk for C-SS plate is higher than that for C-C plate keeping all other parameter fixed
A Simple Linear Time Algorithm for Computing a 1-Median on Cactus Graphs
Get PDFWe address the problem of finding a 1-median on a cactus graph. The problem has already been solved in linear time by the algorithms of Burkard and Krarup (1998), and Lan and Wang (2000). These algorithms are complicated and need efforts. Hence, we develop in this paper a simpler algorithm. First, we construct a condition for a cycle that contains a 1-median or for a vertex that is indeed a 1-median of the cactus. Based on this condition, we localize the search for deriving a 1-median on the underlying cactus. Complexity analysis shows that the approach runs in linear time
Analysis of Heat and Mass Transfer of an Inclined Magnetic Field Pressure-driven Flow Past a Permeable Plate
Get PDFThe study considers heat and mass transfer of magnetohydrodynamics pressure-driven flow passed a stretching permeable surface in the presence of inclined uniform magnetic field. The equations governing the model are transformed by Lie’s group and solved using weighted residual method. The results obtained are compared with that of fourth order Runge-Kutta method that show the effects of Skin friction, Nusselt and Sherwood numbers on the flow. Finally, the influence of some important parameters on the flow are presented graphically and discussed
Stability of Triangular Libration Points in the Sun - Jupiter System under Szebehely’s Criterion
Get PDFIn the present study, the classical fourth-order Runge-Kutta method with seventh-order automatic step-size control has been carried out to examine the stability of triangular libration points in the Sun-Jupiter system. The Sun is a highly luminous body and Jupiter is a highly spinning body, so radiation pressure of the Sun and oblateness of the Jupiter cannot be neglected. These factors must have some effects on the motion of the infinitesimal mass (spacecraft) and consequent effects on the stability of the triangular libration points. It is to be noted that in our problem, infinitesimal mass exerts no influence of attraction on the primaries (Sun and Jupiter) but its motion is influenced by the primaries. Therefore, the equations of motion of the infinitesimal mass moving in the gravitational field of the radiating Sun and oblate Jupiter have been established for numerical integration. To check the stability of the libration points, the infinitesimal mass is allowed to librate for trajectory generation in the vicinity of one of the triangular libration points. Using double-precision computation, the Jacobian constant was calculated in order to observe the validity of the trajectory generation throughout the numerical integration. This constant of integration was checked to make sure that it remained constant at least to eight decimal places, so that other data may be accurate. Following all the above computational techniques, the maximum displacement and maximum velocity envelopes were constructed in the light of previous authors. The reason behind the assumption of the maximum displacement and maximum velocity envelopes is that the spacecraft (infinitesimal mass) will librate for a long time within the region of the envelopes without crossing the x-axis. If the area of the envelope is not maximum within the given time limit and the infinitesimal mass crosses the x-axis, then by changing the initial conditions; we attempt to construct the envelopes of maximum area following previous authors. If the area of the envelope is maximum it means spacecraft (infinitesimal mass) will librate in wider area for a long time without crossing the x-axis and longtime libration will give the higher range of stability. From our observation, it is found that due to the oblateness of Jupiter, the range of stability is reduced but photogravitation of the Sun has no significant effect on the triangular libration points