Using improved Ge and Si detectors, better neutron shielding, and increased counting time, the Cryogenic Dark Matter Search (CDMS) experiment has obtained stricter limits on the cross section of weakly interacting massive particles (WIMPs) elastically scattering from nuclei. Increased discrimination against electromagnetic backgrounds and reduction of the neutron flux confirm WIMPcandidate events previously detected by CDMS were consistent with neutrons and give limits on spin-independent WIMP interactions which are > 2× lower than previous CDMS results for high WIMP mass, and which exclude new parameter space for WIMPs with mass between 8-20 GeV c −2 .PACS numbers: 26.65.+t, 95.75.Wx, 14.60.St This Letter reports new exclusion limits from the Cryogenic Dark Matter Search (CDMS) experiment on the wide class of nonluminous, nonbaryonic, weakly interacting massive particles (WIMPs) [1, 2] which could constitute most of the matter in the universe [3]. A natural WIMP candidate is provided by supersymmetry in the form of the stable lightest superpartner, usually taken to be a neutralino of typical mass ∼ 100 GeV/c 2 [2, 4]. Since the WIMPs are expected to be in a roughly isothermal halo within which the visible portion of our galaxy resides, the energy given to a Ge or Si detector nucleus scattered elastically by a WIMP would be only a few to tens of keV [5].Because of this low recoil energy and very low event rate (< 1 event per day per kg of detector mass), it is essential to suppress backgrounds drastically. The CDMS detectors discriminate nuclear recoils (such as would be produced by WIMPs) from electron recoils by measuring both ionization and phonon energy, greatly reducing the otherwise dominant electromagnetic background. The ionization is much less for nuclear than for electron recoils, while the phonon signal enables a determination of the recoil energy. The main remaining background is from neutrons, which produce WIMP-like recoils, and hence must be distinguished by other means. Two are employed: 1) while Ge and Si have similar scattering rates per nucleon for neutrons, Ge is 5-7 times more efficient than Si for coherently scattering WIMPs; 2) a single WIMP will not scatter in more than one detector, while a neutron frequently will.While brief reviews of all parts of the experiment are provided below, most details have been published [6], and therefore the emphasis here will be on the differences from previous work. The previously published results are from three 165 g Ge BLIP (Berkeley Large Ionization-and-Phonon-mediated) and one 100 g Si ZIP (Z-sensitive Ionization and Phonon-mediated) detectors. The latter, employed as one measure of background neutrons, was not used simultaneously with the Ge BLIPs, but rather in a separate run. BLIP detectors determine phonon production from the detector's calorimetric temperature change, whereas ZIP detectors [7] collect athermal phonons to provide both phonon production and position information. Position information can be obtained
This paper presents a simulation model of the operations in the Emergency Department (ED) and Medical Telemetry (Med Tele) Units at Rush North Shore Medical Center. The model allows management to see the operations of both units as well 3s how the processes of each unit impact the other. Due to the large amount of variability that can take place within these units, Rush North Shore Medical Center along with Cap Gemini Emst & Young sought the use of simulation to help evaluate thei operations and provide insight into possible areas for improvement. Rockwell Automation created a model which depicts the current operations and evaluates possible alternatives to reduce the length of stay in the ED and improve operations. Using simulation, the hospital was able to select two to three key changes, rather than creating more stress with ten or more changes, to get the same result.
Bukavu, une ville située sur les rives du lac Kivu, à l'est de la République démocratique du Congo (RDC), abrite plus d'un million de personnes, dont de nombreuses personnes déplacées par la pauvreté et les conséquences des conflits armés qui continuent d'affecter l'est du Congo. Plus de 10 000 enfants et jeunes de la rue vivent ici dans des situations de rue. 19 jeunes de la rue ont aidé à créer cette carte narrative en enregistrant toutes les données visuelles et en partageant leurs histoires sur leur vie quotidienne. La carte narrative comprend 9 sections et 2 galeries montrant la vie quotidienne des enfants et des jeunes des rues à Bukavu et le travail de PEDER, partenaire de la société civile Grandir dans la rue, pour les aider. Les chapitres comprennent des détails sur la façon dont les enfants et les jeunes des rues collectent les plastiques sur les rives du lac Kivu pour les vendre, ils cuisinent et partagent de la nourriture ensemble, ou achètent dans des restaurants ou des étals. Les jeunes femmes gagnent leur vie dans le travail du sexe et s'occupent de leurs enfants et les jeunes hommes se détendent, créent des liens et espèrent gagner de l'argent supplémentaire en jouant et en pariant. La langue originale enregistrée dans les vidéos est le swahili, elle a été traduite en anglais et en français pour les deux versions de la carte. Tout le matériel visuel et contextuel a été créé par des jeunes de la rue vivant dans les rues de Bukavu, à savoir : Annabelle, Armel, Baba, Baridi, Bikulo, Cornelia, Diomo, Edouard, Francis, Georges, Ginette, Jasmine, Nicaise, Noah, Remi, Royal, Yvette and Zachary.
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