Characterization of the interface between the bulk glass forming alloy Zr_(41)Ti_(14)Cu_(12)Ni_(10)Be_(23) with pure metals and ceramics

The reaction of the bulk glass forming alloy Zr_(41)Ti_(14)Cu_(12)Ni_(10)Be_(23) (Vit 1) with W, Ta, Mo, AlN, Al_2O_3, Si, graphite, and amorphous carbon was investigated. Vit 1 samples were melted and subsequently solidified after different processing times on discs of the different materials. Sessile drop examinations of the macroscopic wetting of Vit 1 on the discs as a function of temperature were carried out in situ with a digital optical camera. The reactions at the interfaces between the Vit 1 sample and the different disc materials were investigated with an electron microprobe. The structure and thermal stability of the processed Vit 1 samples were examined by x-ray diffraction and differential scanning calorimetry. The results are discussed in terms of possible applications for composite materials

Quantum transport through STM-lifted single PTCDA molecules

Using a scanning tunneling microscope we have measured the quantum conductance through a PTCDA molecule for different configurations of the tip-molecule-surface junction. A peculiar conductance resonance arises at the Fermi level for certain tip to surface distances. We have relaxed the molecular junction coordinates and calculated transport by means of the Landauer/Keldysh approach. The zero bias transmission calculated for fixed tip positions in lateral dimensions but different tip substrate distances show a clear shift and sharpening of the molecular chemisorption level on increasing the STM-surface distance, in agreement with experiment.Comment: accepted for publication in Applied Physics

O INSTITUTO DA LEGÍTIMA DEFESA INTERNACIONAL

The White House legal approach to the War on Terror has been one of the most discussed and least understood topics of international law according to legal counselors of the American government themselves. Despite several speeches and official notes on the subject, the issue remains complex because it involves constitutional rights, human rights and national security. This paper analyzes the War on Terror focusing specifically on the self-defense institute in the world risk society. This means that in order to understand how terrorism is threatening the international order, it is necessary to verify the conceptual changes that determine the self-defense institute and the results of this mutation.A abordagem legal da Casa Branca na Guerra ao Terror tem sido muito discutida mas pouco compreendida, de acordo com os próprios assessores jurídicos do governo americano. Apesar de vários discursos proferidos e notas oficiais sobre o assunto, o tema permanece complexo porque envolve garantias constitucionais, direitos humanos e segurança nacional. Este trabalho analisa a Guerra ao Terror, focando especificamente no instituto da legítima defesa na sociedade mundial de risco. Isto significa que para compreender como o terrorismo vem ameaçando a própria ordem internacional, é necessário verificar as mudanças conceituais que delimitam a legítima defesa e quais os resultados dessa mutação