France and SDI

Those critics who argue that the Strategic Defense Initiative (SDI) will divide the Atlantic alliance, frequently cite the French Government\u27s opposition as evidence. The French view of SDI, however, is neither simple nor monolithic

Reformulating the Schrodinger equation as a Shabat-Zakharov system

We reformulate the second-order Schrodinger equation as a set of two coupled first order differential equations, a so-called "Shabat-Zakharov system", (sometimes called a "Zakharov-Shabat" system). There is considerable flexibility in this approach, and we emphasise the utility of introducing an "auxiliary condition" or "gauge condition" that is used to cut down the degrees of freedom. Using this formalism, we derive the explicit (but formal) general solution to the Schrodinger equation. The general solution depends on three arbitrarily chosen functions, and a path-ordered exponential matrix. If one considers path ordering to be an "elementary" process, then this represents complete quadrature, albeit formal, of the second-order linear ODE.Comment: 18 pages, plain LaTe

Semiclassical wave equation and exactness of the WKB method

The exactness of the semiclassical method for three-dimensional problems in quantum mechanics is analyzed. The wave equation appropriate in the quasiclassical region is derived. It is shown that application of the standard leading-order WKB quantization condition to this equation reproduces exact energy eigenvalues for all solvable spherically symmetric potentials.Comment: 13 page

Semiclassical Solution of the Quantum Hydrodynamic Equation for Trapped Bose-condensed Gas in the l=0 Case

In this paper the quantum hydrodynamic equation describing the collective, low energy excitations of a dilute atomic Bose gas in a given trapping potential is investigated with the JWKB semiclassical method. In the case of spherically symmetric harmonic confining potential a good agreement is shown between the semiclassical and the exact energy eigenvalues as well as wave functions. It is also demonstrated that for larger quantum numbers the calculation of the semiclassical wave function is numerically more stable than the exact polynomial with large alternating coefficients.Comment: 12 pages, 7 figure

Accuracy of Semiclassical Methods for Shape Invariant Potentials

We study the accuracy of several alternative semiclassical methods by computing analytically the energy levels for many large classes of exactly solvable shape invariant potentials. For these potentials, the ground state energies computed via the WKB method typically deviate from the exact results by about 10%, a recently suggested modification using nonintegral Maslov indices is substantially better, and the supersymmetric WKB quantization method gives exact answers for all energy levels.Comment: 7 pages, Latex, and two tables in postscrip

A latent trait approach to measuring HIV/AIDS related stigma in healthcare professionals: application of mokken scaling technique

The attitudes of healthcare professionals towards HIV positive patients and high risk groups are central to the quality of care and therefore to the management of HIV/AIDS related stigma in health settings. Extant HIV/AIDS stigma scales that measure stigmatising attitudes towards people living with HIV/AIDS have been developed using scaling techniques such as principal component analysis. This approach has resulted in instruments that are often long. Mokken scale analysis is a nonparametric hierarchical scaling technique that can be used to develop unidimensional cumulative scales. This technique is advantageous over the other approaches; as the scales are usually shorter, while retaining acceptable psychometric properties. Moreover, Mokken scales also make no distributional assumptions about the underlying data, other than that the data are capable of being ordered by item and by person. In this study we aimed at developing a precise and concise measure of HIV/AIDS related stigma among health care professionals, using Mokken scale analysis

Energy landscape, two-level systems and entropy barriers in Lennard-Jones clusters

We develop an efficient numerical algorithm for the identification of a large number of saddle points of the potential energy function of Lennard- Jones clusters. Knowledge of the saddle points allows us to find many thousand adjacent minima of clusters containing up to 80 argon atoms and to locate many pairs of minima with the right characteristics to form two-level systems (TLS). The true TLS are singled out by calculating the ground-state tunneling splitting. The entropic contribution to all barriers is evaluated and discussed.Comment: 4 pages, RevTex, 2 PostScript figure

Competences for democratic culture: An empirical study of an intercultural citizenship project in language pedagogy

This article reports on a pedagogical intervention in foreign language teaching in higher education. It analizes the competences developed by Argentinian and UK-based students as they used Skype to design a leaflet that addressed a real world issue: the Argentinian military dictatorship and its manipulation of the 1978 Football World Cup. The data consists of students’ discussions of this highly disturbing human rights issue. A first level of analysis focused on identifying evidence of competences using the Council of Europe’s conceptual model of ‘competences for democratic culture’ (2016). In a second level of analysis, the data was categorized within the framework of Article 2.2 of the United Nations Declaration on Human Rights Education and Training (2011). This research study provides an empirical test of these two frameworks in the field of language education, an aspect that has not been investigated before. It also contributes to our understanding of the potential of intercultural citizenship projects in achieving the goals of human rights education in foreign language teaching. Results indicate the development of substantial competences for democratic culture defined in the Council of Europe’s model

Competences for democratic culture: An empirical study of an intercultural citizenship project in language pedagogy

This article reports on a pedagogical intervention in foreign language teaching in higher education. It analizes the competences developed by Argentinian and UK-based students as they used Skype to design a leaflet that addressed a real world issue: the Argentinian military dictatorship and its manipulation of the 1978 Football World Cup. The data consists of students’ discussions of this highly disturbing human rights issue. A first level of analysis focused on identifying evidence of competences using the Council of Europe’s conceptual model of ‘competences for democratic culture’ (2016). In a second level of analysis, the data was categorized within the framework of Article 2.2 of the United Nations Declaration on Human Rights Education and Training (2011). This research study provides an empirical test of these two frameworks in the field of language education, an aspect that has not been investigated before. It also contributes to our understanding of the potential of intercultural citizenship projects in achieving the goals of human rights education in foreign language teaching. Results indicate the development of substantial competences for democratic culture defined in the Council of Europe’s model

Sperm design and variation in the New World blackbirds (Icteridae)

Post-copulatory sexual selection (PCSS) is thought to be one of the evolutionary forces responsible for the rapid and divergent evolution of sperm design. However, whereas in some taxa particular sperm traits are positively associated with PCSS, in other taxa, these relationships are negative, and the causes of these different patterns across taxa are poorly understood. In a comparative study using New World blackbirds (Icteridae), we tested whether sperm design was influenced by the level of PCSS and found significant positive associations with the level of PCSS for all sperm components but head length. Additionally, whereas the absolute length of sperm components increased, their variation declined with the intensity of PCSS, indicating stabilizing selection around an optimal sperm design. Given the diversity of, and strong selection on, sperm design, it seems likely that sperm phenotype may influence sperm velocity within species. However, in contrast to other recent studies of passerine birds, but consistent with several other studies, we found no significant link between sperm design and velocity, using four different species that vary both in sperm design and PCSS. Potential reasons for this discrepancy between studies are discussed