Search results
3,036 records were found.
The first experiment in Lambda-hypernuclear spectroscopy using the high precision electron beam at Jefferson laboratory (Jlab) has been carried out. The hypernuclear spectrometer system (HNSS) was used to measure spectra from the {sup 12}C(e, e{prime}K{sup +}){sup 12}{sub {Lambda}}B reaction with sub-1 MeV resolution, the best energy resolution obtained thus far in hypernuclear spectroscopy with magnetic spectrometers. This paper describes the HNSS and the preliminary results for the {sup 12}{sub {Lambda}}B system. The experimental spectrum is consistent with the expected strong spin-flip excitations of unnatural parity states. A program of hypernuclear physics experiments is planned for the future with much higher yield and even better energy resolution.
A Time-of-Flight (TOF) detector, based on plastic scintillator and fine-mesh photomultiplier tubes, has been added to the CDF-II experiment. Since August 2001, the TOF system has been fully instrumented and integrated into the CDF-II data acquisition system. The TOF system will provide particle identification of low momentum charged pions, kaons and protons in -collisions. With a design resolution goal of about 100 ps, separation between charged kaons and pions is expected at the 2 sigma level for momenta below 1.6 GeV/c, which enhances CDF's b-flavor tagging capabilities. They describe the design of the TOF detector and discuss its on-line and off-line calibration. Some performance benchmarks using proton-antiproton collision data are presented.
Die Wirtschaft der RGW-Länder und Jugoslawiens an der Jahreswende 1984/85
Impulsive, local, 3-D reconnection is identified for the first time in a laboratory current sheet. The events observed in the Magnetic Reconnection Experiment (MRX) are characterized by large local gradients in the third direction and cannot be explained by 2-D models. Detailed measurements show that the ejection of flux rope structures from the current sheet plays a key role in these events. By contrast, even though electromagnetic fluctuations in the lower hybrid frequency range are also observed concurrently with the impulsive behavior, they are not the key physics responsible. A qualitative, 3-D, two-fluid model is proposed to explain the observations. The experimental results may be particularly applicable to space and astrophysical plasmas where impulsive reconnection occurs.
Experiments were conducted with a Liquid Lithium Divertor (LLD) in NSTX. Among the goals was to use lithium recoating to sustain deuterium (D) retention by a static liquid lithium surface, approximating the ability of flowing liquid lithium to maintain chemical reactivity. Lithium evaporators were used to deposit lithium on the LLD surface. Improvements in plasma edge conditions were similar to those with lithiated graphite plasma-facing components (PFCs), including an increase in confinement over discharges without lithiumcoated PFCs and ELM reduction during H-modes. With the outer strike point on the LLD, the D retention in the LLD was about the same as that for solid lithium coatings on graphite, or about two times that achieved without lithium PFC coatings. There were also indications of contamination of the LLD surface, possibly d...
Durante o XIV Encontro da Rede Luso Brasileiro de Estudos Ambientais que decorreu
entre 12 e 17 de setembro de 2011 na Cidade
do Recife (Brasil), subordinado ao tema
“Vulnerabilidade Sócio Ambiental na África,
Brasil e Portugal: dilemas e desafios”, foi oficialmente aprovada a adesão à Rede da Universidade de Lisboa, da Universidade Agostinho Neto de Angola, da Universidade de Cabo Verde e da Universidade Eduardo Mondlane
de Moçambique. Com a adesão dos novos membros, foi igualmente decidido alterar o nome da Rede para “Rede de Estudos Ambientais dos Países de Língua Portuguesa ‐ REAPLP”.
Em reunião de trabalho foi decidido a criação
de 5 grupos de interesse científico, respectivamente: Água e Recursos Hídricos, coordenado pela Prof. Manuela Morais – Univ. de Évora; Desenvolvimento Urbano, coordenado
pela Prof. Vanice Selva – Univ. Fed...
Monetärer Bereich Preise Außenhandel Tourismus Einkommen Arbeitsmarkt Sachgütererzeugung Bauwirtschaft Verkehr Landwirtschaft Forstwirtschaft
Kräftiges Wirtschaftswachstum verliert an Dynamik. Österreichs Wirtschaft im Jahr 2000; Economic Boom is Weakening. The Austrian Economy in 2000
Deutsche Wiedervereinigung verlängert Aufschwung. Die österreichische Wirtschaft im Jahr 1990; The Austrian Economy in 1990: Reunification of Germany Prolongs the Economic Upswing in Austria
