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排序方式: 共有62条查询结果,搜索用时 975 毫秒
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Reiter P Khoo TL Lauritsen T Lister CJ Seweryniak D Sonzogni AA Ahmad I Amzal N Bhattacharyya P Butler PA Carpenter MP Chewter AJ Cizewski JA Davids CN Ding KY Fotiades N Greene JP Greenlees PT Heinz A Henning WF Herzberg R Janssens RV Jones GD Kondev FG Korten W Leino M 《Physical review letters》2000,84(16):3542-3545
The entry distribution in angular momentum and excitation energy for the formation of 254No has been measured after the 208Pb(48Ca,2n) reaction at 215 and 219 MeV. This nucleus is populated up to spin 22Planck's over 2pi and excitation energy greater, similar6 MeV above the yrast line, with the half-maximum points of the energy distributions at approximately 5 MeV for spins between 12Planck's over 2pi and 22Planck's over 2pi. This suggests that the fission barrier is greater, similar5 MeV and that the shell-correction energy persists to high spin. 相似文献
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Chow JY Davids K Button C Shuttleworth R Renshaw I Araújo D 《Nonlinear dynamics, psychology, and life sciences》2006,10(1):71-103
Team sport competition can be characterized as a complex adaptive system in which concepts from nonlinear dynamics can provide a sound theoretical framework to understand emergent behavior such as movement coordination and decision making in game play. Nonlinear Pedagogy is presented as a methodology for games teaching, capturing how phenomena such as movement variability, self-organization, emergent decision making, and symmetry-breaking occur as a consequence of interactions between agent-agent and agent-environment constraints. Empirical data from studies of basketball free-throw shooting and dribbling are used as task vehicles to exemplify how nonlinear phenomena characterize game play in sport. In this paper we survey the implications of these data for Nonlinear Pedagogy, focusing particularly on the manipulation of constraints in team game settings. The data and theoretical modeling presented in this paper provide a rationale in nonlinear dynamics for the efficacy of a prominent model of game play teaching, Teaching Games for Understanding approach. 相似文献
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Artūrs Škute Sergejs Osipovs Davids Vardanjans 《International journal of environmental analytical chemistry》2016,96(1):1-14
Nitrogen isotope ratio of nitrate provides a powerful tool to investigate nitrate sources and cycling mechanisms. Although the use of an isotope ratio method for 15N/14N allows identifying the nitrate sources in rivers by estimating a seasonal variation of N-NO3 concentration, however, there are some restrictions. Nitrification, the conversion of NH4+ to NO3-, can proceed with significant nitrogen isotope fractionation, preferentially accumulating 14N in the produced NO3-, and can make it difficult to identify the nitrate source with a high proportion of the isotope δ15N. However, the uptake and assimilation of NH4+ and NO3- have the capability of affecting isotopic compositions of riverine nitrogen compounds, and this may hinder the determination of whether the impact of the nitrate source with a high proportion of the isotope δ15N reduces. In addition, this study demonstrates that nitrate nitrogen concentration may correlate with δ15NNO3 values both positively and negatively. Such correlations are the result of isotope effects during nitrogen transformation processes (e.g. nitrification and assimilation) and isotopic variability in the various nitrate sources. A comparison of NO3- concentration and δ15NNO3 can be used to further distinguish mixing from biological processing. However, in order to get a more precise answer regarding the nitrate sources, it would be useful to take both the data of nitrogen isotopes and data of oxygen isotopes present in nitrates. 相似文献
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H. van Gemerden C. Davids Harry H. Tolkamp Wayland R. Swain Jaap Dorgelo 《Journal of Radioanalytical and Nuclear Chemistry》1995,195(2):371-371
List of participants 相似文献
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J. C. Batchelder K. S. Toth C. R. Bingham L. T. Brown L. F. Conticchio C. N. Davids T. Davinson D. J. Henderson R. J. Irvine D. Seweryniak W. B. Walters P. J. Woods J. Wauters E. F. Zganjar 《Zeitschrift für Physik A Hadrons and Nuclei》1997,357(2):121-122
The α decay of 186Bi was investigated via the 97Mo(92Mo, p2n) reaction and the use of a fragment mass analyzer with a double-sided Si strip detector. In contrast to an earlier work wherein only one α transition was reported, we observed two transitions arising from two isomers in 186Bi with energies and half-lives of: 7158(20) keV, T1/2 = 15.0(17) ms; and 7261(20) keV, T1/2 = 9.8(13) ms. 相似文献
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Ruiz C Parikh A José J Buchmann L Caggiano JA Chen AA Clark JA Crawford H Davids B D'Auria JM Davis C Deibel C Erikson L Fogarty L Frekers D Greife U Hussein A Hutcheon DA Huyse M Jewett C Laird AM Lewis R Mumby-Croft P Olin A Ottewell DF Ouellet CV Parker P Pearson J Ruprecht G Trinczek M Vockenhuber C Wrede C 《Physical review letters》2006,96(25):252501
The strength of the Ec.m. = 184 keV resonance in the 26gAl(p, gamma)27 reaction has been measured in inverse kinematics using the DRAGON recoil separator at TRIUMF's ISAC facility. We measure a value of omega gamma = 35 +/- 7 microeV and a resonance energy of Ec.m. = 184 +/- 1 keV, consistent with p-wave proton capture into the 7652(3) keV state in 27Si, and discuss the implications of these values for 26GAl nucleosynthesis in typical oxygen-neon white-dwarf novae. 相似文献