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| 1 | 查看详情显示文摘 | X.Wan A.M.Turner A.Vishwanath S.Y.Savrasov | | 0，，： | 1 |
| 2 | Growth of a Cellular/Dendritic Array显示文摘This paper describes a time dependent numerical model for the steady and non-steady growthof a cellular/dendritic array in a moving linear temperature field. The model gives fully selfconsistent solutions for axisymmetric interface shapes, predicts cellular and dendritic spacings,undercoolings and the transition between structures. An important feature of the model is thatthe spacing selection mechanism has been treated. The model predicts two different dendriticgrowth regions. One occurs at low dimensionless velocities where the dendrite array is uniform:a small stable range of spacings is predicted and the prediction agrees very well with existing experiments. The other occurs at high dimensionless velocities where the dendrite array is irregular, its minimum spacing is inversely proportional to velocity Experiment was carried out to verify the prediction. The irregular dendrite array was observed and the measured minimum spacing fitted extremely well with the prediction. By fitting the numerical results. Relatively simple analytic expressions are obtained which provide an insight into the cellular and dendritic growth processes and are useful for comparing theory with experiment. | J.D.Hunt Q.Hant and X.Wan(Dept. of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, U.K.) | 1997 | Journal of Materials Science & Technology1997，13，3： | 0 |
| 3 | 基于“张衡一号”卫星的GRO掩星载荷数据分析显示文摘'张衡一号'电磁卫星于2018年2月2日成功发射,该卫星搭载的全球导航卫星系统无线电掩星(GRO)接收机具备了全球定位系统(GPS)卫星和北斗导航系统(BD)卫星的掩星观测功能。对在轨测试期间数据进行分析,GRO掩星电离层反演结果合理、趋势正确,每天能够探测600个左右的电离层掩星事件。对连续2个多月共3万多个GRO掩星事件进行全球覆盖性分析,并与美国COSMIC掩星反演结果对比,GRO掩星与COSMIC掩星均能实现全球覆盖并且N_mF_2和H_mF_2的全球分布情况相近,随着纬度而变化明显。利用不同纬度的3个数字测高仪对时空一致的GRO掩星数据进行对比验证和分析,GRO掩星的N_mF_2相对数字测高仪的相对RM_SE优于9.41%,相关系数优于0.868 2。H_mF_2的相对RM_SE优于7.80%,相关系数优于0.706 6。 | Y.Cheng J.Lin X.H.Shen X.Wan X.X.Li W.J.Wang 程艳(译) 林剑(校) | 2019 | 世界地震译丛2019，50，4： | 0 |
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