نتایج جستجو برای: cross over effect
تعداد نتایج: 3034382 فیلتر نتایج به سال:
In this paper, we present the Black blogosphere’s discussion of the Jena 6 case to uncover how ethnic identity is performed discursively to promote social activism. Historically, African Americans have used radio for communication about critical issues, such as political elections, health care, education, economic development and civil rights. More recently with the growing popularity of blogs ...
We examine the size and distribution of the gap in test scores across races within New York City public schools and the factors that explain these gaps. While gaps are partially explained by differences in student characteristics, such as poverty, differences in schools attended are also important. At the same time, substantial within-school gaps remain and are only partly explained by differen...
Scholars have long recognized the potential of Internet-based communication technologies for improving network research—potential that, to date, remains largely underexploited. In the first half of this paper, we introduce a new public dataset based on manipulations and embellishments of a popular social network site, Facebook.com.We emphasize five distinctive features of this dataset and highl...
In this paper I inquire about the effects initial wealth has on black-white differences in early employment careers. I set up a dynamic model in which individuals simultaneously search for a job and accumulate wealth, and fit it to data from the National Longitudinal Survey (1979-cohort). The estimates show that borrowing constraints are tight for both race groups. Regime changes reveal that di...
fully tunable fs-laser system A. Höfer K. Duncker M. Kiel S. Förster W. Widdra The ferroelectric domain structure on a (001) surface of a BaTiO3 single crystal prepared under ultrahigh vacuum conditions is imaged by laser-excited photoemission electron microscopy (PEEM). The PEEM images allow for discrimination of three domain types by their different photoemission yields. To characterize the c...
The O(α) electroweak radiative corrections to the process p p (ℓ = e, µ) are calculated. The O(α) corrections can be decomposed into separately gauge invariant contributions to the W boson production and decay processes. Factorizing the collinear singularity associated with initial state photon radiation into the parton distribution functions, we find that initial state corrections have a signi...
The purpose of this report is to provide descriptive data on the incidence of and mortality from colorectal cancer among residents of Massachusetts. This report presents Massachusetts colorectal cancer data by year, age, race/ethnicity, stage, and subsite and compares Massachusetts to the nation. Also, the report presents Massachusetts colorectal cancer screening data. Colorectal cancer is one ...
revised November 17, 1997 Rescattering E ects in Quarkonium Production1 Paul Hoyer and St ephane Peign e Nordita Blegdamsvej 17, DK{2100 Copenhagen , Denmark Abstract We study c and J= hadroproduction induced by multiple scattering o xed centres in the target. We determine the minimum number of hard scatterings required and show that additional soft scatterings may be factorized, at the level o...
We propose a simple parametrization for the deep-inelastic diffractive cross section. It contains the contribution of qq̄ production to both the longitudinal and the transverse diffractive structure functions, and of the production of qq̄g final states from transverse photons. We start from the hard region and perform a suitable extrapolation into the soft region. We test our model on the 1994 ZE...
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