Inorganic separator for a high temperature silver-zinc battery

Electrode design, inorganic separators, and performance tests of multiplate five ampere-hour silver-zinc battery cel

The gravity of magnetic stresses and energy

In the framework of designing laboratory tests of relativistic gravity, we investigate the gravitational field produced by the magnetic field of a solenoid. Observing this field might provide a mean of testing whether stresses gravitate as predicted by Einstein's theory. A previous study of this problem by Braginsky, Caves and Thorne predicted that the contribution to the gravitational field resulting from the stresses of the magnetic field and of the solenoid walls would cancel the gravitational field produced by the mass-energy of the magnetic field, resulting in a null magnetically-generated gravitational force outside the solenoid. They claim that this null result, once proved experimentally, would demonstrate the stress contribution to gravity. We show that this result is incorrect, as it arises from an incomplete analysis of the stresses, which neglects the axial stresses in the walls. Once the stresses are properly evaluated, we find that the gravitational field outside a long solenoid is in fact independent of Maxwell and material stresses, and it coincides with the newtonian field produced by the linear mass distribution equivalent to the density of magnetic energy stored in a unit length of the solenoid. We argue that the gravity of Maxwell stress can be directly measured in the vacuum region inside the solenoid, where the newtonian noise is absent in principle, and the gravity generated by Maxwell stresses is not screened by the negative gravity of magnetic-induced stresses in the solenoid walls.Comment: 10 pages, final version accepted for publication in PR

Performance of novel silicon n-in-p planar Pixel Sensors

The performance of novel n-in-p planar pixel detectors, designed for future upgrades of the ATLAS Pixel system is presented. The n-in-p silicon sensors technology is a promising candidate for the pixel upgrade thanks to its radiation hardness and cost effectiveness, that allow for enlarging the area instrumented with pixel detectors. The n-in-p modules presented here are composed of pixel sensors produced by CiS connected by bump-bonding to the ATLAS readout chip FE-I3. The characterization of these devices has been performed before and after irradiation up to a fluence of 5 x 10**15 1 MeV neq cm-2 . Charge collection measurements carried out with radioactive sources have proven the functioning of this technology up to these particle fluences. First results from beam test data with a 120 GeV/c pion beam at the CERN-SPS are also discussed, demonstrating a high tracking efficiency of (98.6 \pm 0.3)% and a high collected charge of about 10 ke for a device irradiated at the maximum fluence and biased at 1 kV.Comment: Preprint submitted to Nuclear Instruments and Methods A. 7 pages, 13 figure

Recomendação de boro para o maracujazeiro amarelo em solo de Tabuleiro Costeiro.

Nos estados que mais produzem maracujá no Brasil: Bahia, Sergipe, Espírito Santo e Rio de Janeiro, o maracujazeiro é cultivado em solos de Tabuleiros Costeiros. No Estado da Bahia cultiva- se aproximadamente 45% da produção nacional (322.755 toneladas) em 23.227 hectares, cuja produtividade média é inferior à nacional. Em 6.845 hectares de solos de Tabuleiros Costeiros do Estado da Bahia são produzidos 76.355 toneladas de maracujá, o que representa 24% da produção do Estado e 29% da área cultivada (IBGE, 2009). Os solos de Tabuleiros Costeiros são altamente intemperizados, com baixos teores de matéria orgânica, baixa capacidade de armazenamento de água e altos teores de ferro e alumínio, favorecenda deficiência de boro nas plantas de maracujá (BORGES et al., 2010).bitstream/item/55052/1/ComunicadoTecnico-149.pdfPublicação eletrônica