Publish in OALib Journal
APC: Only $99
The paper studied the
imperatives of health psychologists in the control and management of HIV/ AIDS.
HIV/AIDS is a relatively new disease, but has caused more deaths than any other
disease in human history, and there is no known cure yet. Even though, HIV/AIDS
is a death sentence, experts agreed that early detection, and early
commencement of treatment may prolong the life of the patients, and that early
detection may prevent or reduce the transmission of the virus. Early detection,
commencement of treatment, and compliance with medical advice are the
responsibilities of the health psychologist. This paper therefore, concludes
that health psychologist is indispensable in effective control, and management
of HIV/AIDS, and so recommends that awareness be created on the roles of health
psychologists in this regard, through health education.
This paper investigates the tolerable sample size needed for Ordinary
Least Square (OLS) Estimator to be used when there is presence of Multicollinearity
among the exogenous variables of a linear regression model. A regression model
with constant term (β0)
and two independent variables (with β1 and β2 as their respective
regression coefficients) that exhibit multicollinearity was considered. A Monte
Carlo study of 1000 trials was conducted at eight levels of multicollinearity
(0, 0.25, 0.5, 0.7, 0.75, 0.8, 0.9 and 0.99) and sample sizes (10, 20, 40, 80,
100, 150, 250 and 500). At each specification, the true regression coefficients
were set at unity while 1.5, 2.0 and 2.5 were taken as the hypothesized value.
The power value rate was obtained at every multicollinearity level for the
aforementioned sample sizes. Therefore, whether the hypothesized values highly
depart from the true values or not once the multicollinearity level is very
high (i.e. 0.99), the sample size
needed to work with in order to have an error free estimation or the inference
result must be greater than five hundred.
In the plasma electrolytic oxidation (PEO) coating of light metal alloys, changing the electrical parameters and electrolytic composition can change the discharge behaviour and, ultimately, the thickness, surface morphology and porosity of the coating. In the present study a combination of cathodic and anodic current pulses with suitable Ton and Toff periods were used to control the porosity and other structural defects of PEO coatings of an AM60B magnesium alloy. In order to investigate the effect of a current mode on the plasma discharge behaviour and coating microstructure during the PEO treatment of magnesium alloy, the emission intensities of six different spectral lines from the plasma species were recorded simultaneously as a function of both time and current mode using optical emission spectroscopy (OES) system. The fluctuations in signal intensities and temperature during the coating process reflect differences in location of both the discharge initiation, and discharge type. The coating surface morphology and microstructure that are obtained can be linked to the plasma discharge behavior. These results are discussed in relation to the discharge behaviour, and how such changes in discharge behaviour relate to the coating mechanisms.