Electronic structure of the quasi-one-dimensional organic conductor TTF-TCNQ

We study the electronic structure of the quasi-one-dimensional organic conductor TTF-TCNQ by means of density-functional band theory, Hubbard model calculations, and angle-resolved photoelectron spectroscopy (ARPES). The experimental spectra reveal significant quantitative and qualitative discrepancies to band theory. We demonstrate that the dispersive behavior as well as the temperature-dependence of the spectra can be consistently explained by the finite-energy physics of the one-dimensional Hubbard model at metallic doping. The model description can even be made quantitative, if one accounts for an enhanced hopping integral at the surface, most likely caused by a relaxation of the topmost molecular layer. Within this interpretation the ARPES data provide spectroscopic evidence for the existence of spin-charge separation on an energy scale of the conduction band width. The failure of the one-dimensional Hubbard model for the {\it low-energy} spectral behavior is attributed to interchain coupling and the additional effect of electron-phonon interaction.Comment: 18 pages, 9 figure

Ocorrência de lesões em carcaças de bovinos de corte no Pantanal em função do transporte Occurrence of carcass bruising of beef cattle in the Pantanal related to time spent transport

O trabalho teve como objetivo avaliar a influência do transporte na ocorrência de lesões, em carcaças de bovinos abatidos no Pantanal Sul Matogrossense, por meio da quantificação do número e do tamanho das lesões, assim como a localização da freqüência de ocorrência das lesões nos principais cortes comerciais padronizados para o mercado interno. Do total de 121 carcaças avaliadas, foi observado que 102 (84,3%) tiveram uma ou mais lesões, totalizando 270 lesões que resultaram na remoção de 56,1kg de carne, com média geral de 0,5kg por animal ou 0,6kg por animal, considerando-se apenas os animais que tiveram lesões. A freqüência de lesões em carcaças de bovinos evidenciou diferença significativa de acordo com as condições de transporte. As maiores proporções de lesões foram encontradas em animais submetidos ao transporte rodoviário por mais de uma hora e distâncias maiores que 70km, sendo grande parte em estradas não-pavimentadas. Conclui-se que os animais submetidos à série sucessiva de manejo e transportados em estradas não-pavimentadas por longas distâncias apresentaram maior proporção de lesões, sendo que os animais provenientes do lote VI apresentaram maior número de lesões.<br>This study aimed to assess the influence of transport on the occurrence of carcass bruising of cattle slaughtered in the Pantanal, by quantifying the number and size of bruises, locating the frequency of occurrence of bruises in the main commercial cuts standardized for interne market. From a total of 121 carcasses assessed, 102 (84.3%) had one or more bruises, totaling 270 bruises, which resulted in the removal of 56.1kg meat. The frequency of carcass bruises of cattle showed significant difference, according to the conditions of transport. The highest proportions of bruises found in animals submitted to road transport for more than one hour in distances longer than 70km, a great part of which on dirty toads. The conclusion is that the animals submitted to the successive series of handling and transported on dirty roads for long distances caused the highest proportion of bruises, whereas the animals submitted to lot IV presented the highest number of bruises

Newspaper coverage of a violent assault by a mentally ill person

The media is an important source of public information on mental ill-health. A man with a serious psychiatric illness attacked a minister with a knife at a Remembrance Sunday service in a remote, rural part of the Highlands, inflicting a severe facial wound. We aimed to identify lessons for the National Health Service (NHS) from the media coverage of the incident and of a subsequent court case and NHS Highland inquiry and in addition to explore how newspaper reporters approached reporting such incidents. We searched local and regional, national Scottish, and the Scottish editions of three UK newspapers for relevant coverage. We also conducted structured telephone interviews with eight reporters who had attended the inquiry press conference. Most of the media coverage was associated with the assault and the court case, rather than the inquiry results. Only three of 10 inquiry recommendations were mentioned in any reports. Coverage largely dealt with identified short-falls, rather than proposed solutions. The NHS had made little comment in advance of the announcement of the inquiry results. Most of the newspaper coverage had already occurred. The NHS therefore limited its opportunity to influence newspaper coverage. The interpretation of the results is limited by the size of the study, but the coverage of such events forms part of the discourse on mental health in the media episodes and may have some affect on public perception of mental health issues. We conclude that, without providing confidential information, the NHS should take a more active stance in providing information on the nature and treatment of mental illness in such instances, even in advance of court cases