University of Alabama

About: University of Alabama is a education organization based out in Tuscaloosa, Alabama, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 27323 authors who have published 48609 publications receiving 1565337 citations. The organization is also known as: Alabama & Bama.

Global Core Plasma Model

Abstract: Over 40 years of ground and spacecraft plasmaspheric measurements have resulted in many statistical descriptions of plasmaspheric properties. In some cases, these properties have been represented as analytical descriptions that are valid for specific regions or conditions. For the most part, what has not been done is to extend regional empirical descriptions or models to the plasmasphere as a whole. In contrast, many related investigations depend on the use of representative plasmaspheric conditions throughout the inner magnetosphere. Wave propagation, involving the transport of energy through the magnetosphere, is strongly affected by thermal plasma density and its composition. Ring current collisional and wave particle losses also strongly depend on these quantities. Plasmaspheric also plays a secondary role in influencing radio signals from the Global Positioning System satellites. The Global Core Plasma Model (GCPM) is an attempt to assimilate previous empirical evidence and regional models for plasmaspheric density into a continuous, smooth model of thermal plasma density in the inner magnetosphere. In that spirit, the International Reference Ionosphere is currently used to complete the low altitude description of density and composition in the model. The models and measurements on which the GCPM is currently based and its relationship to IRI will be discussed.

Large magnetoresistance in bcc Co/MgO/Co and FeCo/MgO/FeCo tunnel junctions

Abstract: By use of first-principles electronic structure calculations, we predict that the magnetoresistance of the bcc $\mathrm{Co}(100)∕\mathrm{Mg}\mathrm{O}(100)∕\mathrm{bcc}\mathrm{Co}(100)$ and $\mathrm{Fe}\mathrm{Co}(100)∕\mathrm{Mg}\mathrm{O}(100)∕\mathrm{Fe}\mathrm{Co}(100)$ tunneling junctions can be several times larger than the very large magnetoresistance predicted for the $\mathrm{Fe}(100)∕\mathrm{Mg}\mathrm{O}(100)∕\mathrm{Fe}(100)$ system. The origin of this large magnetoresistance can be understood by considering the electrons at the Fermi energy traveling perpendicular to the interfaces. For the minority spins there is no state with ${\ensuremath{\Delta}}_{1}$ symmetry whereas for the majority spins there is only a ${\ensuremath{\Delta}}_{1}$ state. The ${\ensuremath{\Delta}}_{1}$ state decays much more slowly than the other states within the MgO barrier. In the absence of scattering which breaks the conservation of momentum parallel to the interfaces, the electrons traveling perpendicular to the interfaces undergo total reflection if the moments of the electrodes are antiparallel. These arguments apply equally well to systems with other well ordered tunnel barriers and for which the most slowly decaying complex energy band in the barrier has ${\ensuremath{\Delta}}_{1}$ symmetry. Examples include systems with (100) layers constructed from Fe, bcc Co, or bcc FeCo electrodes and Ge, GaAs, or ZnSe barriers.

Family Violence and Juvenile Sex Offending The Potential Mediating Role of Psychopathic Traits and Negative Attitudes Toward Women

Abstract: Juvenile sex offenders were compared to other juvenile offenders in the degree of violence against women they witnessed in their families of origin. Poor impulse control, a callous and unemotional interpersonal style, and sexist attitudes toward women were tested as potential mediators of this relation. Participants were 70 incarcerated juvenile males, ages 13 to 18, from three offender categories: 23 sex offenders, 17 violent offenders, and 30 noncontact offenders. Results indicated that the witnessing of severe domestic violence was related not only to juvenile sex offending but to contact offending in general. There were no group differences on measures of poor impulse control or sexist attitudes toward women. However, sex offenders were found to have more callous and unemotional traits than other offenders. Therefore, although these traits do not mediate the effects of witnessing family violence, they do seem to be important in distinguishing juvenile sex offenders from other juvenile offenders.

Predictors of Self-Reported Adherence in Persons Living with HIV Disease

Abstract: This study examined the relationships between the five dimensions of the Wilson and Cleary model of health-related quality of life and three self-reported adherence measures in persons living with HIV using a descriptive survey design. Data collection occurred in seven cities across the United States, including university-based AIDS clinics, private practices, public and for-profit hospitals, residential and day-care facilities, community-based organizations, and home care. The three dependent adherence measures studied were "medication nonadherence," "follows provider advice," and "missed appointments." The sample included 420 persons living with HIV disease with a mean age of 39 years of which 20% were women and 51% were white; subjects had a mean CD4 count of 321 mm3. HIV-positive clients with higher symptom scores, particularly depression, were more likely to be nonadherent to medication, not to follow provider advice, and to miss appointments. Participants who reported having a meaningful life, feeli...

An Empirical Analysis of Stock Prices in Major Asian Markets and the United States

Abstract: This study uses unit root and cointegration tests to examine the relationships among the stock markets in Hong Kong, South Korea, Singapore, Taiwan, Japan, and the United States. All the stock prices are analyzed both individually and collectively to test for international market efficiency. Unit roots in stock prices are found. Pairwise and higher-order cointegration tests indicate that there is no evidence of cointegration among the stock prices. The findings suggest that the stock prices in major Asian markets and the United States are weak-form efficient individually and collectively in the long run. It also implies that international diversification among the markets is effective.