Multiwavelength observations of a TeV-Flare from W comae

We report results from an intensive multiwavelength campaign on the intermediate-frequency-peaked BL Lacertae object W Com (z = 0.102) during a strong outburst of very high energy gamma-ray emission in 2008 June. The very high energy gamma-ray signal was detected by VERITAS on 2008 June 7-8 with a flux F(>200 GeV) =(5.7 0.6) × 10-11 cm-2 s -1, about three times brighter than during the discovery of gamma-ray emission from W Com by VERITAS in 2008 March. The initial detection of this flare by VERITAS at energies above 200 GeV was followed by observations in high-energy gamma rays (AGILE; E γ≥ 100 MeV), X-rays (Swift and XMM-Newton), and at UV, and ground-based optical and radio monitoring through the GASP-WEBT consortium and other observatories. Here we describe the multiwavelength data and derive the spectral energy distribution of the source from contemporaneous data taken throughout the flare. © 2009. The American Astronomical Society. All rights reserved

Emprego de uma lama com caráter refratário para o processo de fundição odontológica Use of a refractory slurry characteristic in mold casting

A utilização de novos materiais, especialmente aqueles metálicos, tem sido uma constante na odontologia. Graças às necessidades da indústria no desenvolvimento de produtos cada vez com maior resistência, principalmente à corrosão, a prótese tem-se beneficiado com um número elevado de ligas metálicas excelentes. Para atender a necessidade de conformar as ligas em restaurações ou aparelhos próprios à nossa profissão, devem ser desenvolvidos refratários para estas ligas. Este é o caso da proposta de usar uma lama refratária como molde para confecção da fundição. A lama proposta, além de servir aos propósitos, tem-se mostrado capaz de oferecer melhor acabamento da liga.<br>The use of new materials, particularly metal alloys, has been a constant trend in Dentistry. The industrial need to develop products with greater resistance to corrosion has benefited prosthodontics with a large number of excellent metallic alloys. In order to adapt such alloys to dental restorations or devices, refractory materials ought to be developed. That is the aim of using slurry as a mold in the casting process, which also makes it possible to obtain surfaces with improved finish