Several modern approaches to separation of concerns support identification and encapsulation of important concerns that could not traditionally be encapsulated. They generally require that the software be written up front with the appropriate modularization. However, as software evolves, the need arises for new concerns, often of new kinds. This position paper motivates the need for on-demand r...

The static and dynamic properties of the isotropic XY-model (s = 1/2) on the inhomogeneous periodic chain, composed of N segments with n different exchange interactions and magnetic moments, in a transverse field h are obtained exactly at arbitrary temperatures. The properties are determined by introducing the generalized Jordan-Wigner transformation and by reducing the problem to a diagonaliza...

BACKGROUND Sexually transmitted infections (STIs) are common in adolescents worldwide. Vulnerability to STIs increases with risky sexual practices. This study described the sexual practices, estimated the prevalence of STIs, and identified correlates associated with STIs among participants, enrolled in public high schools, in the District of Panama, Panama. METHODS A cross sectional study, us...

1Barcelona Supercomputing Center, Carrer de Jordi Girona, 29-31, 08034 Barcelona, Spain. 2Institució Catalana per a la Recerca i Estudis Avançats-Complex Systems Lab, Universitat Pompeu Fabra, 08003 Barcelona, Spain. 3Institut de Biologia Evolutiva (CSIC-Universitat Pompeu Fabra), Passeig Marı́tim de la Barceloneta 37, 08003 Barcelona, Spain. 4Smithsonian Tropical Research Institute, P.O. Box 08...

Let A be a unital algebra and M be a unital A-bimodule. A characterization of generalized derivations and generalized Jordan derivations from A into M, through zero products or zero Jordan products, is given. Suppose that M is a unital left A-module. It is investigated when a linear mapping from A into M is a Jordan left derivation under certain conditions. It is also studied whether an algebra...

1. Dept. of Community and Mental Health Nursing, School of Nursing, Mafraq, Jordan 2. Dept. of Maternal, Child and Family Health, School of Nursing, the Hashemite University, Zarqa, Jordan 3. Dept. of Adult Health, School of Nursing, Zarqa University, Zarqa, Jordan 4. Unit of E-Learning & Information Technology, College of Nursing, King Saud University, Al-Diriyah, Saudi Arabia 5. Dept. of Midw...

The Human immunodeficiency virus type-1 (HIV-1) subtype B is the most predominant clade in Central America; but information about the evolutionary history of this virus in this geographic region is scarce. In this study, we reconstructed the spatiotemporal and population dynamics of the HIV-1 subtype B epidemic in Panama. A total of 761 HIV-1 subtype B pol sequences obtained in Panama between 2...

A century ago, Camille Jordan proved that the complex general linear group GLn(C) has the Jordan property: there is a Jordan constant Cn such that every finite subgroup H ≤ GLn(C) has an abelian subgroup H1 of index [H : H1] ≤ Cn. We show that every connected algebraic group G (which is not necessarily linear) has the Jordan property with the Jordan constant depending only on dimG, and that the...