The ALICE Inner Tracking System

The design characteristics of the ALICE inner tracking system are presented together with the performances measured in beam tests and expected from Monte Carlo simulations

Test results of the front-end system for the Silicon Drift Detectors of ALICE

The front-end system of the Silicon Drift Detectors (SDDs) of the ALICE experiment is made of two ASICs. The first chip performs the preamplification, temporary analogue storage and analogue-to-digital conversion of the detector signals. The second chip is a digital buffer that allows for a significant reduction of the connection from the front-end module to the outside world. In this paper, the results achieved on the first complete prototype of the front-end system for the SDDs of ALICE are presented

Beam test results of the irradiated Silicon Drift Detector for ALICE

The Silicon Drift Detectors will equip two of the six cylindrical layers of high precision position sensitive detectors in the ITS of the ALICE experiment at LHC. In this paper we report the beam test results of a SDD irradiated with 1 GeV electrons. The aim of this test was to verify the radiation tolerance of the device under an electron fluence equivalent to twice particle fluence expected during 10 years of ALICE operation.Comment: 6 pages,6 figures, to appear in the proceedings of International Workshop In high Multiplicity Environments (TIME'05), 3-7 October 2005, Zurich,Switzerlan

Métodos para determinar taninos em sorgo, avaliando-se o desempenho de aves e a digestibilidade in vitro da matéria seca.

Com o objetivo de comparar metodos para determinar a presenca de taninos em sorgo (Sorghum bicolor (L.) Moench), foi conduzido um experimento com aves e realizada a analise da digestibilidade "in vitro" da materia seca. Foram avaliados os metodos Azul da Prussia, Vanilina/HCI e Proantocianidina, e na preparacao das racoes, foram utilizados dez diferentes hibridos de sorgo e uma variedade de milho. A presenca de compostos fenolicos determinada pelo metodo Azul da Prussia apresentou maior correlacao com o ganho de peso das aves e a digestibilidade "in vitro" da materia seca

On the muon neutrino mass

During the runs of the PS 179 experiment at LEAR of CERN, we photographed an event of antiproton-Ne absorption, with a complete pi+ -> mu+ ->e+ chain. From the vertex of the reaction a very slow energy pi+ was emitted. The pi+ decays into a mu+ and subsequently the mu+ decays into a positron. At the first decay vertex a muon neutrino was emitted and at the second decay vertex an electron neutrino and a muon antineutrino. Measuring the pion and muon tracks and applying the momentum and energy conservation and using a classical statistical interval estimator, we obtained an experimental upper limit for the muon neutrino mass: m_nu < 2.2 MeV at a 90% confidence level. A statistical analysis has been performed of the factors contributing to the square value of the neutrino mass limit.Comment: 18 pages, 5 eps figure

Hostels : greenhouses or warehouses? : an ethnographic and theoretical study of the origins, development and purposes of approved premises

This thesis explores the development of hostels / approved premises and considers the existence of an 'unexplored' past that may help cast light on their current purposes. Drawing on historical and theoretical domains it constructs a hinterland from which to undertake critical exploration of their current practices and possible futures. A staged ethnographic study of two hostels is offered, with a four year gap in between to allow consideration as to whether hostels are changing and whether wider policy shifts impacting on probation more generally, can be seen to be shaping hostels' possible future(s). Observations, interviews, engagement in both formal and informal meetings with staff, residents and managers have been used to develop a view of hostels from the underside of practice. Critical theorising and exploration of hostels' past has been located against both the wider social and political shifts that may be seen to have impacted on the rehabilitative and re-integrative role of the hostel, and the emerging themes emanating from the ethnographic work. Key points of discussion include: an argument for a longer history of hostels than is currently suggested, an exploration of the relationship between hostels and the wider probation service and criminal justice system, the centrality of re-integration to rehabilitation and the impact of new punitiveness on hostels' changing role and function at the start of the 21st century. It is argued that a retreat from integration of offenders into society and a devaluing of their social agency and moral worth is now at risk of becoming accepted as part of hostels' 'new' public protection role. Consideration is given to how staff and residents may be experiencing the 'risk driven' changes that are taking place and what wider implications this works findings may have for policy, practice and rehabilitative theory. An alternative penology is offered that both takes account of hostels past and acknowledges their changed clientele.EThOS - Electronic Theses Online ServiceGBUnited Kingdo

Conductive Cooling of SDD and SSD Front-End Chips for ALICE

We present analysis, technology developments and test results of the heat drain system of the SDD and SSD front-end electronics for the ALICE Inner Tracker System (ITS). Application of super thermoconductive carbon fibre thin plates provides a practical solution for the development of miniature motherboards for the FEE chips situated inside the sensitive ITS volume. Unidirectional carbon fibre motherboards of 160 -300 micron thickness ensure the mounting of the FEE chips and an efficient heat sink to the cooling arteries. Thermal conductivity up to 1.3 times better than copper is achieved while preserving a negligible multiple scattering contribution by the material (less than 0.15 percent of X/Xo)