期刊文献+
共找到7篇文章
< 1 >
每页显示 20 50 100
Thermodynamic properties and mixing thermodynamic parameters of binary homogeneous metallic melts 被引量:2
1
作者 ZHANG ManMetallurgical Engineering School, University of Science and Technology Beijing, Beijing 100083, China 《Rare Metals》 SCIE EI CAS CSCD 2003年第1期25-32,共8页
After the investigation on the thermodynamic properties and mixingthermodynamic parameters of binary homogeneous metallic melts involving compound, peritectic as wellas solid solution, it was found that the equations ... After the investigation on the thermodynamic properties and mixingthermodynamic parameters of binary homogeneous metallic melts involving compound, peritectic as wellas solid solution, it was found that the equations of mixing free energy DELTA G^m and excess freeenergy DELTA G^(XS) of them can he expressed by the following equations: DELTA G^m = SIGMA x [SIGMAN_i DELTA G_I^(THETA) + RT(SIGMA N_j ln N_j + SIGMA N_i ln N_i )] and DELTA G^(XS) = DELTA G^m -RT(a ln a + b ln b), respectively. 展开更多
关键词 metallic melt mixing thermodynamic parameter coexistence theory activity mass action concentration
下载PDF
Thermodynamic properties and mixing thermodynamic parameters of two-phase metallic melts 被引量:3
2
作者 JianZhang 《Journal of University of Science and Technology Beijing》 CSCD 2005年第3期213-220,共8页
Based on the calculating model of metallic melts involving eutectic, the calculating equations of mixing thermodynamic parameters for two phase metallic melts have been formulated in the light of those equations of ho... Based on the calculating model of metallic melts involving eutectic, the calculating equations of mixing thermodynamic parameters for two phase metallic melts have been formulated in the light of those equations of homogeneous solutions. Irrespective as to whether the activity deviation relative to Raoultian behavior is positive or negative, or the deviation is symmetrical or unsym-metrical, the evaluated results not only agree well with experimental values, but also strictly obey the mass action law. This testifies that these equations can authentically reflect the structural reality and mixing thermodynamic characteristics of two-phase metallic melts. The calculating equations of mixing thermodynamic parameters for the model of two phase metallic melts offer two practical criteria (activity and mixing thermodynamic parameters) and one theoretical criterion (the mass action law). 展开更多
关键词 mass action law mixing thermodynamic parameters EUTECTIC activity mass action concentration
下载PDF
Covalent bonding and J–J mixing effects on the EPR parameters of Er^(3+) ions in GaN crystal
3
作者 柴瑞鹏 李隆 +1 位作者 梁良 庞庆 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第7期435-439,共5页
The EPR parameters of trivalent Er(3+) ions doped in hexagonal Ga N crystal have been studied by diagonalizing the 364×364 complete energy matrices. The results indicate that the resonance ground states may be... The EPR parameters of trivalent Er(3+) ions doped in hexagonal Ga N crystal have been studied by diagonalizing the 364×364 complete energy matrices. The results indicate that the resonance ground states may be derived from the Kramers doublet Γ6. The EPR g-factors may be ascribed to the stronger covalent bonding and nephelauxetic effects compared with other rare-earth doped complexes, as a result of the mismatch of ionic radii of the impurity Er(3+)ion and the replaced Ga(3+) ion apart from the intrinsic covalency of host Ga N. Furthermore, the J–J mixing effects on the EPR parameters from the high-lying manifolds have been evaluated. It is found that the dominant J–J mixing contribution is from the manifold 2K(15/2), which accounts for about 2.5%. The next important J–J contribution arises from the crystal–field mixture between the ground state 4I(15/2) and the first excited state4I(13/2), and is usually less than 0.2%. The contributions from the rest states may be ignored. 展开更多
关键词 EPR parameters covalent bonding effect J–J mixing effect rare-earth ion Er3+
下载PDF
Parameterization of ocean wave-induced mixing processes for finite water depth 被引量:6
4
作者 YANG Yongzeng ZHAN Run TENG Yong 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2009年第4期16-22,共7页
Three dimensional wave-induced mixing plays an important role in shallow water area. A quite direct approach through the Reynolds average upon characteristic length scale is proposed to parameterize the horizontal and... Three dimensional wave-induced mixing plays an important role in shallow water area. A quite direct approach through the Reynolds average upon characteristic length scale is proposed to parameterize the horizontal and vertical shallow water mixing. Comparison of finite depth case with infinite depth results indicates that the difference of the wave-induced mixing strength is evident. In the shallow water condition, the infinite water depth approximation overestimates the mixing strength in the lower layers. The nonzero horizontal wave-induced mixing presents anisotropic property near the shore. The Prandtl's mixing length theory underestimated the wave-induced mixing in the previous studies. 展开更多
关键词 Reynolds average Characteristic length scale Wave-induced mixing parameter
下载PDF
Thermodynamic Properties and Mixing Thermodynamic Parameter of Binary Metallic Melt Involving Compound Formation 被引量:2
5
作者 ZHANGJian 《Journal of Iron and Steel Research International》 SCIE CAS CSCD 2005年第2期11-15,共5页
Based on the coexistence theory of metallic melts involving compound formation, the theoretical calculation equations of mixing thermodynamic parameters are established by giving up some empirical parameters in the as... Based on the coexistence theory of metallic melts involving compound formation, the theoretical calculation equations of mixing thermodynamic parameters are established by giving up some empirical parameters in the associated solution model. For Fe-Al, Mn-Al and Ni-Al, the calculated results agree well with the experimental values, testifying that these equations can exactly embody mixing thermodynamic characteristics of these melts. 展开更多
关键词 mass action law mixing thermodynamic parameter coexistence theory activity mass action concentration
下载PDF
Analysis of soluble chemical transfer from soil to surface runoff and incomplete mixing parameter identification
6
作者 Ju-xiu Tong Jin-zhong Yang Bill X.Hu 《Water Science and Engineering》 EI CAS CSCD 2015年第3期217-225,共9页
A two-layer mathematical model proposed by Tong et al. (2010) was used to predict soluble chemical transfer from soil into surface runoff with ponded water on the soil surface. Infiltration-related incomplete mixing... A two-layer mathematical model proposed by Tong et al. (2010) was used to predict soluble chemical transfer from soil into surface runoff with ponded water on the soil surface. Infiltration-related incomplete mixing parameter γ and runoff-related incomplete mixing parameter a in the analytical solution of the Tong et al. (2010) model were assumed to be constant. In this study, different laboratory experimental data of soluble chemical concentration in surface runoff from initially unsaturated and saturated soils were used to identify the variables γ and a based on the analytical solution of the model. The values of γ and a without occurrence of surface runoff were constant and equal to their values at the moment when the surface runoff started. It was determined from the results that γ decreases with the increase of the ponded water depth, and when the initial volumetric water content is closer to the saturated water content, there is less variation of parameter γ after the occurrence of surface runoff. As infiltration increases, the soluble chemical concentration in surface runoff decreases. The values of parameter a range from 0 to 1 for the fine loam and sand under the controlled infiltration conditions, while it can increase to a very large value, greater than 1, for the sand under the restrained infiltration conditions, and the analytical solution of the model is not valid for experimental soil without any infiltration if a is expected to be less than or equal to 1. The soluble chemical concentrations predicted from the model with variable incomplete mixing parameters γ and α are more accurate than those from the model with constant γ and α values. 展开更多
关键词 Surface runoff Incomplete mixing parameter Analytical solution Soluble chemical
下载PDF
A simulation study on the measurement of D^0-■ mixing parameter y at BESⅢ
7
作者 黄彬 郑阳恒 +50 位作者 李卫东 边渐鸣 曹国富 曹学香 陈申见 邓子艳 傅成栋 高原宁 何康林 何苗 花春飞 黄性涛 季晓斌 李海波 梁羽铁 刘春秀 刘怀民 刘秋光 刘锁 刘英杰 马秋梅 马想 冒亚军 毛泽普 莫晓虎 潘明华 庞彩莹 平荣刚 秦纲 秦亚红 邱进发 孙胜森 孙永昭 王纪科 王亮亮 文硕频 伍灵慧 谢宇广 徐敏 严亮 尤郑昀 俞国威 苑长征 袁野 张长春 张建勇 张学尧 张瑶 朱永生 朱志丽 邹佳恒 《Chinese Physics C》 SCIE CAS CSCD 北大核心 2008年第12期945-951,共7页
We established a method on measuring the D^0-D^0 mixing parameter y for BESIII experiment atthe BEPC II e^+e^- collider. In this method, the doubly tagged 4(3770) D^0-D^0 events, with one D decaysto CP-eigenstates ... We established a method on measuring the D^0-D^0 mixing parameter y for BESIII experiment atthe BEPC II e^+e^- collider. In this method, the doubly tagged 4(3770) D^0-D^0 events, with one D decaysto CP-eigenstates and the other D decays semileptonically, are used to reconstruct the signals. Since this analysis requires good e/π separation, a likelihood approach, which combines the dE/dx, time of flight and the electromagnetic shower detectors information, is used for particle identification. We estimate the sensitivity of the measurement of y to be 0.007 based on a 20 fb^-1 fully simulated MC sample. 展开更多
关键词 LIKELIHOOD electron identification D^0-D^0 mixing mixing parameter y
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部