1,949 research outputs found
Framing Autism Causes and Prevelance: A Content Analysis of Television Evening News Coverage--1994 Through April 2010
Autism has been declared an urgent public health concern by the U.S. government and an epidemic by some advocacy groups. Determining autism’s diagnostic criteria, prevalence, and causes have been challenging. It is important to examine how the U.S. media have contributed to the public’s understanding of autism. Previous research found that British media coverage of the theory that vaccines cause autism was shown to contribute to the decline of vaccination rates in Britain (Lewis & Speers, 2003). This study examined U.S. television news media coverage using an agenda-setting theory and media framing perspective. A content analysis was conducted of national television evening news broadcasts airing on ABC, CBS, and NBC from 1994, when autism was first recognized as a spectrum disorder through April 2010, the time of this study. Specifically, this study examined the saliency of autism stories and how autism was framed in terms of prevalence and causes
Letter from S. W. Colson to B. R. Colson
Letter from S. W. Colson to B. R. Colson. The three-page handwritten note is dated 8 February 1910. There is a transcript of the correspondence in the item PDF
Letter from S. W. Colson to B. R. Colson
Letter from S. W. Colson to B. R. Colson. The three-page handwritten note is dated 21 August 1907. There is a transcript of the correspondence in the item PDF
Letter from S. W. Colson to J. O. Barnes
Letter from S. W. Colson to J. O. Barnes. The one-page handwritten note is dated 24 May 1909. There is a transcript of the correspondence in the item PDF
Role of pair-breaking and phase fluctuations in c-axis tunneling in underdoped BiSrCaCuO
The Josephson Plasma Resonance is used to study the c-axis supercurrent in
the superconducting state of underdoped
BiSrCaCuO with varying degrees of controlled
point-like disorder, introduced by high-energy electron irradiation. As
disorder is increased, the Josephson Plasma frequency decreases proportionally
to the critical temperature. The temperature dependence of the plasma frequency
does not depend on the irradiation dose, and is in quantitative agreement with
a model for quantum fluctuations of the superconducting phase in the CuO
layers.Comment: 2 pages, submitted to the Proceedings of M2S-HTSC VIII Dresde
Annual Report 1998. Chemical Structure and Dynamics
The Chemical Structure and Dynamics (CS&D) program is a major component of the William R. Wiley Environmental Molecular Sciences Labo- ratory (EMSL), developed by Pacific Northwest National Laboratory (PNNL) to provide a state-of- the-art collaborative facility for studies of chemical structure and dynamics. We respond to the need for a fundamental, molecular-level understanding of chemistry at a wide variety of environmentally important interfaces by (1) extending the experimental characterization and theoretical description of chemical reactions to encompass the effects of condensed media and interfaces; (2) developing a multidisciplinary capability for describing interracial chemical processes within which the new knowledge generated can be brought to bear on complex phenomena in envi- ronmental chemistry and in nuclear waste proc- essing and storage; and (3) developing state-of- the-art analytical methods for characterizing com- plex materials of the types found in stored wastes and contaminated soils, and for detecting and monitoring trace atmospheric species. Our program aims at achieving a quantitative understanding of chemical reactions at interfaces and, more generally, in condensed media, compa- rable to that currently available for gas-phase reactions. This understanding will form the basis for the development of a priori theories for pre- dicting macroscopic chemical behavior in con- densed and heterogeneous media, which will add significantly to the value of field-scale envi- ronmental models, predictions of short- and long- term nuclear waste storage stabilities, and other areas related to the primary missions of the U.S. Department of Energy (DOE)
Hole and Electron Contributions to the Transport Properties of Ba(Fe_(1-x)Ru_x)_2As_2 Single Crystals
We report a systematic study of structural and transport properties in single
crystals of Ba(Fe_(1-x)Ru_x)_2As_2 for x ranging from 0 to 0.5. The isovalent
substitution of Fe by Ru leads to an increase of the a parameter and a decrease
of the c parameter, resulting in a strong increase of the AsFeAs angle and a
decrease of the As height above the Fe planes. Upon Ru substitution, the
magnetic order is progressively suppressed and superconductivity emerges for x
> 0.15, with an optimal Tc ~ 20K at x = 0.35 and coexistence of magnetism and
superconductivity between these two Ru contents. Moreover, the Hall coefficient
RH which is always negative and decreases with temperature in BaFe2As2, is
found to increase here with decreasing T and even change sign for x > 0.15. For
x_Ru = 0.35, photo-emission studies have shown that the number of holes and
electrons are similar with n_e = n_h ~ 0.11, that is twice larger than found in
BaFe2As2 [1]. Using this estimate, we find that the transport properties of
Ba(Fe_0.65Ru_0.35)_2As_2 can be accounted for by the conventional multiband
description for a compensated semi-metal. In particular, our results show that
the mobility of holes is strongly enhanced upon Ru addition and overcomes that
of electrons at low temperature when x_Ru > 0.15.Comment: new version with minor correction
Fel Oscillators with Tapered Undulators: Inclusion of Harmonic Generation and Pulse Propagation
We review the theory of FEL oscillators operating with tapered undulators. We
consider the case of a uniform tapering and introduce a parameter which
characterizes the effect of the tapering on the gain and on the saturation
intensity. We analyze the effect of the tapering on the FEL dynamics by
including the pulse propagation effects too. We analyze the importance of
tapering as a tool to model the optical pulse shapes and to control the higher
harmonic intensities
Supercooling of the high field vortex phase in single crystalline BSCCO
Time resolved magneto-optical images show hysteresis associated with the
transition at the so-called ``second magnetization peak'' at B_sp in
single-crystalline Bi_2Sr_2CaCu_2O_8+d. By rapid quenching of the high-field
phase, it can be made to persist metastably in the sample down to fields that
are nearly half B_sp.Comment: 2 pages, 2 figures Submitted to the conference proceedings of M2S-VI,
February 200, Housto
Unconventional high-energy-state contribution to the Cooper pairing in under-doped copper-oxide superconductor HgBaCaCuO
We study the temperature-dependent electronic B1g Raman response of a
slightly under-doped single crystal HgBaCaCuO with a
superconducting critical temperature Tc=122 K. Our main finding is that the
superconducting pair-breaking peak is associated with a dip on its
higher-energy side, disappearing together at Tc. This result hints at an
unconventional pairing mechanism, whereas spectral weight lost in the dip is
transferred to the pair-breaking peak at lower energies. This conclusion is
supported by cellular dynamical mean-field theory on the Hubbard model, which
is able to reproduce all the main features of the B1g Raman response and
explain the peak-dip behavior in terms of a nontrivial relationship between the
superconducting and the pseudo gaps.Comment: 7 pages 4 figure
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