Relativistic effects on LEED intensities from Au(111)

Comparison of relativistically and nonrelativistically calculated intensity versus energy profiles in low energy electron diffraction (LEED) from the (111) surface of Au (Z = 79) reveals that relativistic corrections are quite significant. They can however, be obtained in very good approximation by quasirelativistic calculations, in which spin-averaged relativistic phase shifts are used as input for the nonrelativistic multiple scattering formalism. Further, relativistic effects on intensities are found to be comparable to differences arising from different approximations to the exchange part of the ion core potential

Unauthorized Alien Students, Higher Education, and In-State Tuition Rates: A Legal Analysis

[Excerpt] Currently, federal law prohibits states from granting unauthorized aliens certain postsecondary educational benefits on the basis of state residence, unless equal benefits are made available to all U.S. citizens. This prohibition is commonly understood to apply to the granting of “in-state” residency status for tuition purposes. Legislation to amend this federal law has routinely been introduced in previous Congresses, and several similar bills have been introduced in the 111th Congress, including H.R. 1751, S. 729, and H.R. 4321. Meanwhile, some states have passed laws aimed at making unauthorized state residents eligible for in-state tuition without violating this provision. This report provides a legal overview of cases involving immigrant access to higher education, as well as an analysis of the legality of state laws that make in-state tuition rates available to illegal aliens

Sex Discrimination and the United States Supreme Court: Developments in the Law

[Excerpt] In its sex discrimination decisions, the United States Supreme Court not only has defined the applicability of the equal protection guarantees of the Constitution and the nondiscriminatory policies of federal statutes, but also has rejected the use of gender stereotypes and has continued to recognize the discriminatory effect of gender hostility in the workplace and in schools. This report focuses on sex discrimination challenges based on the equal protection guarantees of the Fourteenth and Fifth Amendments; the prohibition against employment discrimination contained in Title VII of the Civil Rights Act of 1964; and the prohibition against sex discrimination in education contained in Title IX of the Education Amendments of 1972. Although this report focuses on recent legal developments in each of these areas, this report also provides historical context by discussing selected landmark sex discrimination cases

The Age Discrimination in Employment Act (ADEA): A Legal Overview

[Excerpt] This report provides an overview of the Age Discrimination in Employment Act (ADEA) and discusses current legal and legislative developments. The ADEA, which prohibits employment discrimination against persons over the age of 40, was enacted “to promote employment of older persons based on their ability rather than age; to prohibit arbitrary age discrimination in employment; [and] to help employers and workers find ways of meeting problems arising from the impact of age on employment.” The ADEA, which applies to employers, labor organizations, and employment agencies, makes it unlawful for an employer “to fail or refuse to hire or to discharge any individual or otherwise discriminate against any individual with respect to his compensation, terms, conditions, or privileges of employment, because of such individual’s age.” The statute not only applies to hiring, discharge, and promotion, but also prohibits discrimination in employee benefit plans such as health coverage and pensions. The Equal Employment Opportunity Commission (EEOC) is responsible for enforcing the provisions of the ADEA. The ADEA applies to employers who have “twenty or more employees for each working day in each of twenty or more calendar weeks in the current or preceding calendar year.” A labor organization is covered by the ADEA if it “exists for the purpose ... of dealing with employers concerning grievances, labor disputes, wages, rates of pay, hours, or other terms or conditions of employment.” An employment agency and its agents are subject to the ADEA if the agency “regularly undertakes with or without compensation” the procurement of employees for an employer, other than an agency of the United States. The ADEA also covers congressional and most federal employees. In addition, the Supreme Court recently handed down a series of decisions involving the ADEA during its 2007-2008 term, including Sprint/United Management Co. v. Mendelsohn; Federal Express Corp. v. Holowecki; Gomez-Perez v. Potter; Kentucky Retirement Systems v. Equal Employment Opportunity Commission; and Meacham v. Knolls Atomic Power Laboratory. Each of these cases is discussed below

The Semantics of Purity in the Ancient Near East: Lexical Meaning as a Projection of Embodied Experience

This article analyzes the primary terms for purity in Biblical Hebrew, Ugaritic, Sumerian, Akkadian and Hittite. Building on insights from cognitive linguistics and embodiment theory, this study develops the premise that semantic structure – even of seemingly abstract concepts– is grounded in real-world bodily experience. An examination of purity terms reveals that all of them can be related to a concrete sense pertaining to radiance (brilliance, brightness, shininess). The article traces the semantic development of purity terms in distinct experiential contexts and shows how semantic analysis can elucidate the inner logic of fundamental religious concepts

On the calculation of the minimax-converse of the channel coding problem

A minimax-converse has been suggested for the general channel coding problem by Polyanskiy etal. This converse comes in two flavors. The first flavor is generally used for the analysis of the coding problem with non-vanishing error probability and provides an upper bound on the rate given the error probability. The second flavor fixes the rate and provides a lower bound on the error probability. Both converses are given as a min-max optimization problem of an appropriate binary hypothesis testing problem. The properties of the first converse were studies by Polyanskiy and a saddle point was proved. In this paper we study the properties of the second form and prove that it also admits a saddle point. Moreover, an algorithm for the computation of the saddle point, and hence the bound, is developed. In the DMC case, the algorithm runs in a polynomial time.Comment: Extended version of a submission to ISIT 201

On the Diversity-Multiplexing Tradeoff of Unconstrained Multiple-Access Channels

In this work the optimal diversity-multiplexing tradeoff (DMT) is investigated for the multiple-input multiple-output fading multiple-access channels with no power constraints (infinite constellations). For K users (K>1), M transmit antennas for each user, and N receive antennas, infinite constellations in general and lattices in particular are shown to attain the optimal DMT of finite constellations for the case N equals or greater than (K+1)M-1, i.e., user limited regime. On the other hand for N<(K+1)M-1 it is shown that infinite constellations can not attain the optimal DMT. This is in contrast to the point-to-point case in which infinite constellations are DMT optimal for any M and N. In general, this work shows that when the network is heavily loaded, i.e. K>max(1,(N-M+1)/M), taking into account the shaping region in the decoding process plays a crucial role in pursuing the optimal DMT. By investigating the cases where infinite constellations are optimal and suboptimal, this work also gives a geometrical interpretation to the DMT of infinite constellations in multiple-access channels

Influence of the scattering potential model on low energy electron diffraction from Cu(001)−c(2 × 2)-Pb

A dynamical LEED intensity analysis is reported for Cu(001)−c(2 × 2)-Pb. The adsorbate layer distance from the substrate is determined as 2.29 Å, and the topmost interlayer spacing for the substrate is the same as in bulk Cu, in contrast to a contraction for clean Cu(001). This structural result is, within the accuracy reached, insensitive to changes in the assumed scattering potential models. The r-factors suggest a weak preference for an energy-dependent exchange correlation and a moderate one for adding a localized adsorption part inside the muffin-tin spheres. The sensitivity of spectra and r-factors to changes in the assumed isotropic Debye temperature for Pb suggests that vibrational anisotropy should be taken into account in order to improve the accuracy of the analysis. Calculated spin polarization spectra are very sensitive to the exchange approximation, the localized absorption and the Debye temperature. Together with experimental data, they should be useful in particular for determining the vibrational anisotropy