6,776 research outputs found
Produção de alho-semente livre de vĂrus em pequenas propriedades.
bitstream/item/57208/1/CT-99.pd
Alho livre de vĂrus: tecnologia para aumento de produtividade.
Suplemento. Trabalho apresentado no 51. Congresso Brasileiro de Olericultura, Viçosa, MG
DT Sector Collector electronics design and construction
The CMS detector at LHC is equipped with Drift Tubes (DT) chambers for muon detection and triggering in the barrel region. The Sector Collector (SC) modules collect the track segments reconstructed by on-chamber trigger electronics. Data from different chambers are aligned in time and sent to the subsequent reconstruction processors via optical links. Several FPGA devices performing the processing of the data were designed in VHDL, including spy features to monitor the trigger data flow. A test jig was set up with custom hardware and software in order to fully validate final production boards. Installation and commissioning in CMS provided first experience with the synchronization and monitoring tools
Design and Test of the Off-Detector Electronics for the CMS Barrel Muon Trigger
Drift Tubes chambers are used in the CMS barrel for tagging the passage of high Pt muons generated in a LHC event and for triggering the CMS data read out. The Sector Collector (SC) system synchronizes the track segments built by trigger modules on the chambers and deliver them to reconstruction processors (Track Finder, TF) that assemble full muon tracks. Then, the Muon Sorter (MS) has to select the best four candidates in the barrel and to filter fake muons generated by the TF system redundancy. The hardware implementations of the Sector Collector and Muon Sorter systems satisfy radiation, I/O and fast timing constraints using several FPGA technologies. The hardware was tested with custom facilities, integrated with other trigger subsystems, and operated in a beam test. A test beam on a 40 MHz bunched beam validated the local trigger electronics and off-detector prototype cards and the synchronization tools. The CMS Magnet Test and Cosmic challenge in 2006 proved stable and reliable operation of the Drift Tubes trigger and its integration with other trigger systems and with the readout system. Constraints, design, test and operation of the modules are presented
Da\phi ne gamma-rays factory
Gamma sources with high flux and spectral densities are the main requirements
for new nuclear physics experiments to be performed in several worldwide
laboratories and envisaged in the ELI-NP (Extreme Light Infrastructure-Nuclear
Physics) project or in the IRIDE (Interdisciplinary Research Infrastructure
with Dual Electron Linacs) proposals. The paper is focalized on an experiment
of gamma photons production using Compton collisions between the DA\Phi NE
electron beam and a high average power laser pulse, amplified in a
Fabry-P\'erot optical resonator. The calculations show that the resulting gamma
beam source has extremely interesting properties in terms of spectral density,
energy spread and gamma flux comparable (and even better) with the last
generation gamma sources. The energy of the gamma beam depends on the adopted
laser wavelength and can be tuned changing the energy of the electron ring. In
particular we have analyzed the case of a gamma factory tunable in the 2-9 MeV
range. The main parameters of this new facility are presented and the
perturbation on the transverse and longitudinal electron beam dynamics is
discussed. A preliminary accelerator layout to allow experiments with the gamma
beam is presented with a first design of the accelerator optics.Comment: 26 pages, 15 figure
The Injection System of the INFN-SuperB Factory Project: Preliminary Design
THPEA007International audienceThe ultra high luminosity B-factory (SuperB) project of INFN requires a high performance and reliable injection system, providing electrons at 4 GeV and positrons at 7 GeV, to fulfill the very tight requirements of the collider. Due to the short beam lifetime, continuous injection of electrons and positrons in both HER and LER rings is necessary to keep the average luminosity at a high level. Polarized electrons are required for experiments and must be delivered by the injection system, due to the beam lifetime shorter than the polarization build-up: they will be produced by means of a SLAC-SLC polarized gun. One or two 1 GeV damping rings are used to reduce e+ and e- emittances. Two schemes for positron production are under study, one with electron-positron conversion at low energy (<1 Gev), the second at 6 GeV with a recirculation line to bring the positrons back to the damping ring. Acceleration through the Linac is provided by a S-band RF system made of traveling wave, room temperature accelerating structures. An option to use the C-band technology is also presented
Critical finger ischemia and myocardial fibrosis development after sudden interruption of sildenafil treatment in a systemic sclerosis patient.
Systemic sclerosis (SSc) is a connective tissue disease frequently associated with Raynaudâs Phenomenon (RP). Among possible pharmacological treatments, phosphodiesterase 5 inhibitors are considered in cases of severe non -responsive RP. We present the case of a male SSc patient wh presented with critical finger ischemia and concomitant appearance of myocardial fibrosis after sudden interruption of sildenafil treatment
Operating experience with electron cloud clearing electrodes at DAFNE
During the current run of an electron-positron collider DAFNE special
electrodes for electron cloud suppression have been inserted in all dipole and
wiggler magnets of the positron ring. In this paper we discuss the impact of
these electrodes on beam dynamics and overall collider performance. In
particular we report results of measurements such as e-cloud instabilities
growth rate, transverse beam size variation, tune shifts along the bunch train
etc. with the electrodes switched on and off that clearly indicate the
effectiveness of the electrodes for e-cloud suppression.Comment: presented at ECLOUD'12: Joint INFN-CERN-EuCARD-AccNet Workshop on
Electron-Cloud Effects, La Biodola, Isola d'Elba, Italy, 5-9 June 201
Immunomodulatory properties of mesenchymal stem cells : a review based on an interdisciplinary meeting held at the Kennedy Institute of Rheumatology Division, London, UK, 31 October 2005
Peer reviewedPublisher PD
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