Application of the time-dependent charge asymmetry method for longitudinal position determination in prototype proportional chambers for the PANDA experiment

The PANDA collaboration intends to build a state-of-the-art detector to study the physics of antiproton annihilation in the charm mass region at the future FAIR facility at GSI, Darmstadt. One major part of the PANDA detector is the straw tube tracker. It will consist of about 6000 individual straws grouped in 11 double layers and filled with an Ar+10%CO_2 gas mixture. The required radial spatial resolution is about 150 micron. Two different methods are considered for longitudinal coordinate measurements - skewed double layers and a novel method based on the time-dependent charge asymmetry. The latter method is presented in this article.Comment: 18 pages, 13 figures, Preprint submitted to NIM

Critique [of American Medical and Intellectual Reaction to African Health Issues, 1850-1960: From Racialism to Cross-Cultural Medicine by David McBride]

Theories about inherent racial characteristics, both those purporting to be scientifically (empirically) based and those emanating from the soft sciences, have changed dramatically over the past century and a half. As David McBride notes, the basis for research about the etiology of disease and the provision of health care in the United States has been and continues to be empirically questionable. McBride further argues that the American health care approach has been significantly influenced by cultural, social, and economic factors which had little or no relation to scientific truth

[Review of] Rodolfo O. De La Garza, Frank D. Bean, Charles M. Bonjean, Ricardo Romo, and Rodolfo Alvarez, eds. The Mexican American Experience: An Interdisciplinary Anthology

Mexican-Americans comprise the second largest minority group in the United States and one of the most rapidly growing elements in the population. Their history in the American southwest goes back almost four hundred years, they have interacted with Anglo·Americans in that region since the early nineteenth century, and have been the most numerous immigrant group coming to the United States since the middle of the twentieth century. Despite this clear evidence of their significance and their impact on this country, scholars in the social sciences have often neglected this ethnic group in their research and writing. This volume makes an effort to correct the oversight

[Review of] Dirk Hoerder, ed. The Immigrant Labor Press in North America, 1840s-70s (Three volumes)

Dirk Hoerder has undertaken a truly mammoth task -- the identification, analysis, and the location of surviving collections of the immigrant labor press published in the United States and Canada from the mid-nineteenth century to the present. For the most part his efforts have been successful. Without question he has provided researchers interested in the American immigrant experience or American labor history with a valuable research tool

[Review of] Shivalingappa S. Halli. How Minority Status Affects Fertility: Asian Groups in Canada

The broad subject of ethnicity and its impact on the social behavior of immigrant and minority groups is topical and is of interest both to scholars and to the general public. As a result, Halli\u27s study of fertility rates among Asian immigrants and their descendants in Canada addresses a timely subject

On the statistics of correlator outputs

Characteristic function, probability density function, and probability distribution function computations for correlation detector output, and correlator output statistic

Codes for protection from synchronization loss and additive errors

Codes for protection from synchronization loss and additive error

Data compression for satellite images

An efficient data compression system is presented for satellite pictures and two grey level pictures derived from satellite pictures. The compression techniques take advantages of the correlation between adjacent picture elements. Several source coding methods are investigated. Double delta coding is presented and shown to be the most efficient. Both predictive differential quantizing technique and double delta coding can be significantly improved by applying a background skipping technique. An extension code is constructed. This code requires very little storage space and operates efficiently. Simulation results are presented for various coding schemes and source codes

Performance of self bit synchronization systems

Optimum estimator for random signal sequence derived by digital computer and evaluated by Monte Carlo metho