Pneumocéfalo Espontâneo Hipertensivo

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Use of dialkyldithiocarbamato complexes of bismuth(III) for the preparation of nano- and microsized Bi2S3 particles and the X-ray crystal structures of [Bi{S2CN(CH3)(C6H13)}(3)] and [Bi{S2CN(CH3)(C6H13)}(3)(C12H8N2)]

A range of bismuth(III) dithiocarbamato complexes were prepared and characterized. The X-ray crystal structures of the compounds [Bi{S2CN(CH3)(C6H13)}3] (1) and [Bi{S2CN(CH3)- (C6H13)}3(C12H8N2)] (2) are reported. The preparation of Bi2S3 particulates using a wet chemical method and involving the thermalysis of Bi(III) dialkyldithiocarbamato complexes is described. The influence of several experimental parameters on the optical and morphological properties of the Bi2S3 powders was investigated. Nanosized Bi2S3 colloids were obtained having long-term stability and showing a blue shift on the optical band edge; the presence of particles exhibiting quantum size effects is discussed. Morphological welldefined Bi2S3 particles were obtained in which the fiber-type morphology is prevalent.FCT - POCTI/1999/CTM/ 3545

Public Security and Policy Networks in Brazil

This article discussed the problems of governance of the policy networks in Brazilian public security field. After distinguished the concepts of police, policing and policy, we will describe the constitution of public security networks on two issues concerning the residents of Brasilia, the Brazil's capital: crime-related problems in schools and deaths in the traffic. Then, we will discuss the nature and the challenges of policy networks and evaluate the governance capacity of the Brazilian Secretariats of Public Security (SSP's). We conclude that there is poor governance capacity due to the historical functions of SSP's