Indexing microwave switch Patent

Microwave waveguide switch with rotor position contro

Medicine and Public Health in Latin America: A History

Citation: McCrea, H. L. (2016). Medicine and Public Health in Latin America: A History. Isis, 107(3), 614-616. doi:10.1086/688465Over the past three to four decades historical works focused on health and medicine in Latin America and the Caribbean have burgeoned into a rich body of scholarship. Scholars delve into a myriad of subjects using medicine and health as lenses through which structural, material, and human experiences with inequality can be analyzed across race, ethnic, gender, and economic lines. To date, much of the historical inquiry on medicine and public health in Latin America and the Caribbean has concentrated on uncovering the powerful relationships forged between medical elites, scientists, statesmen, and laypersons. In this vein, the history of Latin America and the Caribbean is situated within an interconnected globe where germs know no boundaries and disease vectors shape and reshape military campaigns and occupations, hygiene and sanitation trends, and household customs. Within this world, historical narratives and actors assume a more complex and nuanced form through scholarship that probes into the dark recesses of human suffering and the valiant (and sometimes not so altruistic) efforts of medical professionals and statesmen to launch public health campaigns to curb disease and contain contagion. Pioneering works by David Nobel Cook (1998), Alfred W. Crosby (1972), Elinor G. K. Melville (1997), and Nancy Leys Stepan (1996) laid the methodological groundwork for understanding the mechanisms that created human differences. Others have sought to tell a story about war, revolution, and social upheaval by focusing on a particular disease epidemic or public health campaign

The Naval Commander and Public Relations

Public relations, like so many command functions, is difficult of definition and susceptible to no firm tests of do\u27s and dont\u27s - the sort of list on which so many of us from time to time would like to rest our cases. No matter how complex the subject may be, it is most important that a naval commander realize that public relations is one of hfs important duties; in fact, it is one of his more im­portant command functions

Monte Carlo transition probabilities. II

The macroscopic quantizations of matter into macro-atoms and radiant and thermal energies into r- and k-energy packets initiated in Paper I is completed with the definition of transition probabilities governing energy flows to and from the thermal pool. The resulting Monte Carlo method is then applied to the problem of computing the hydrogen spectrum of a Type II supernova. This test problem is used to demonstrate the scheme's consistency as the number of energy packets N -> infinity, to investigate the accuracy of Monte Carlo estimators of radiative rates, and to illustrate the convergence characteristics of the geometry-independent, constrained Lambda-iteration method employed to obtain the NLTE stratifications of temperature and level populations. In addition, the method's potential, when combined with analytic ionization and excitation formulae, for obtaining useful approximate NLTE solutions is emphasized.Comment: 17 pages, 4 figure

A Snapshot of J. L. Synge

A brief description is given of the life and influence on relativity theory of Professor J. L. Synge accompanied by some technical examples to illustrate his style of work

Intergroup Dialogue as Praxis for Engaging the Intercultural World

Intergroup Dialogue (IGD) is a formalized program that centers dialogue among students in the classroom. The IGD program uses Martin Buber’s (1970) concept of dialogue, and this semester-long project situates dialogue as a useful addition to an Intercultural Communication course. Bringing components of a formal dialogue program into the classroom as a part of a course allows students to engage with difficult topics, such as race, gender, sexual orientation, class, and ability, among others, in a way that helps students process and better understand perspectives different from their own. This essay provides specific opportunities for meaningful dialogue and concludes an evaluation of our semester-long project and the lessons learned along the way

Dielectric resonances of ordered passive arrays

The electrical and optical properties of ordered passive arrays, constituted of inductive and capacitive components, are usually deduced from Kirchhoff's rules. Under the assumption of periodic boundary conditions, comparable results may be obtained via an approach employing transfer matrices. In particular, resonances in the dielectric spectrum are demonstrated to occur if all eigenvalues of the transfer matrix of the entire array are unity. The latter condition, which is shown to be equivalent to the habitual definition of a resonance in impedance for an array between electrodes, allows for a convenient and accurate determination of the resonance frequencies, and may thus be used as a tool for the design of materials with a specific dielectric response. For the opposite case of linear arrays in a large network, where periodic boundary condition do not apply, several asymptotic properties are derived. Throughout the article, the derived analytic results are compared to numerical models, based on either Exact Numerical Renormalisation or the spectral method.Comment: 12 pages, 12 figure

The Einstein 3-form G_a and its equivalent 1-form L_a in Riemann-Cartan space

The definition of the Einstein 3-form G_a is motivated by means of the contracted 2nd Bianchi identity. This definition involves at first the complete curvature 2-form. The 1-form L_a is defined via G_a = L^b \wedge #(o_b \wedge o_a). Here # denotes the Hodge-star, o_a the coframe, and \wedge the exterior product. The L_a is equivalent to the Einstein 3-form and represents a certain contraction of the curvature 2-form. A variational formula of Salgado on quadratic invariants of the L_a 1-form is discussed, generalized, and put into proper perspective.Comment: LaTeX, 13 Pages. To appear in Gen. Rel. Gra

New Path Equations in Absolute Parallelism Geometry

The Bazanski approach, for deriving the geodesic equations in Riemannian geometry, is generalized in the absolute parallelism geometry. As a consequence of this generalization three path equations are obtained. A striking feature in the derived equations is the appearance of a torsion term with a numerical coefficients that jumps by a step of one half from equation to another. This is tempting to speculate that the paths in absolute parallelism geometry might admit a quantum feature.Comment: 4 pages Latex file Journal Reference: Astrophysics and space science 228, 273, (1995