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Measurements of the distribution of rotational states in a nitrogen molecular beam before and after deflection by collision with rare gas atoms are interpreted in terms of the intermolecular potential. A potential of the form V(R, θ) = 4?(1 + b2P2(cosθ)| R*12 ? 4θ [1 + α2P2(cosθ)]/R*6 is used with semiclassical theory using the sudden approximation to fit the observations. As α2 is known, as well as ? and the size parameter, σ, the objective is to find b2. However, the calculated state distributions are found to systematically vary from those measured, irrespective of the value of b2. This result is tentatively explained as due to the inadequacies of the 12-6 potential. 相似文献
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Vocal fold nodules (VNs) in children are benign, bilateral lesions occurring on the mid-membranous vocal folds. Repetitive phonotraumatic behavior leading to chronic vocal fold injury and repair is frequently cited as the primary etiology; however, specific behavioral characteristics may predispose some children toward intense and potentially phonotraumatic voice use, thereby contributing secondarily to VN formation. The purpose of this case-control study was to determine whether children with VNs possess unique behavioral characteristics that may predispose them to VN development. Parents of 26 children with VNs (20 boys, 6 girls, mean age=7.2 years, SD=2.5 years), and 29 vocally normal, medical controls (22 boys, 7 girls, mean age=6.7 years, SD=2.4), completed the Childhood Behavior Checklist (CBCL/4-18, Achenbach, 1991), a standardized parent-rating scale with strong psychometric properties. No significant between-group differences were detected on any of the behavior problem syndrome scales. Group differences approached significance for the individual items "screams a lot" and "teases a lot" (VN group > Controls). The VN group scored significantly higher than the controls on the "Social Scale," a compilation of positive ratings of the child's social activity, frequency of contacts with friends, behavior with others, and behavior by themselves. Observed outcomes were consistent with previous characterizations of children with VN as "outgoing" or "extroverted" but were not consistent with other claims that this population may be at risk for "aggressive," "attentional," or "impulsive" behavior problems. 相似文献
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Johann M. Heuser Walter F.J. Muller Peter Senger Christian Muntz Joachim Stroth 《Czechoslovak Journal of Physics》2005,55(12):1649-1653
The Compressed Baryonic Matter (CBM) experiment is a fixed-target heavy-ion experiment planned at GSI's future international
Facility for Antiproton and Ion Research (FAIR). CBM will study strongly interacting matter at high baryon densities where
the QCD phase diagram is poorly known. The experiment applies a detector concept new to heavy-ion physics: All charged particles
as well as secondary vertices from heavy-flavor decays are exclusively reconstructed in a high-performance silicon tracking
system. It will be installed in a magnetic dipole field between the target and further detection systems for particle identification
and calorimetry. High track densities and high collision rates require the application of most advanced silicon detectors.
The technological challenges include high position resolution in thinnest possible pixel and microstrip sensors, combined
with extreme radiation hardness, fast self-triggered readout and ultra low-mass mechanical supports. The article outlines
the physics and detector concept of CBM and discusses the performance requirements of the silicon tracker and the beginning
R&D.
for the CBM collaboration
Presented in the Poster Session “Future Experiments and Facilities” at the 18th International Conference “Quark Matter 2005”,
Budapest, Hungary, 4–9 August 2005. 相似文献
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Wagner A Muntz C Oeschler H Sturm C Barth R Cieslak M D&ecedil;bowski M Grosse E Koczon P Laue F Mang M Miskowiec D Schwab E Senger P Beckerle P Brill D Shin Y Strobele H Walus W Kohlmeyer B Puhlhofer F Speer J Yoo IK 《Physical review letters》2000,84(1):18-21
Recent results from CLEO on B-->Kpi indicate that the phase gamma may be substantially different from that obtained from other fit to the KM matrix elements in the standard model. We show that gamma extracted using B-->Kpi,pipi is sensitive to new physics occurring at loop level. It provides a powerful method to probe new physics in electroweak penguin interactions. Using effects due to anomalous gauge couplings as an example, we show that within the allowed ranges for these couplings information about gamma obtained from B-->Kpi,pipi can be very different from the standard model prediction. 相似文献