PENG Jun
,
WANG Shijun
,
DONG Yuanchi
,
LIU Lixia
,
ZHOU Yun
,
CHEN Erbao
钢铁研究学报(英文版)
The solubility of nitrogen in the FeCVN system was measured at 1 708 K and the model of calculating activity (action concentration) of nitrogen (N) and vanadium (V) was derived according to the phase diagram and the coexistence theory of the metal melt structure. The solubility expression of nitrogen in the FeCVN system at 1 708 K was wN=0058 194-0010 367wC+0005 543 4wV. Comparing the computing results with the experimental results, a satisfactory conclusion could be obtained. The analysis of the FeCVN system using this model showed that VN was present in a high temperature metal melt, which would reduce the action concentration of nitrogen obviously. It was consequently disadvantageous to the removal of nitrogen from hot metal.
关键词:
metal melt;coexistence theory;action concentration;activity
CHEN Erbao
,
WANG Shijun
钢铁研究学报(英文版)
Carbon solubility in MnFe melts (xMn=0083-0706, xFe=0034-0715) was measured experimentally at various temperatures. By thermodynamic derivation and calculation, the relationship between activity coefficient of carbon in infinite dilute solution of manganese in MnC system and temperature was obtained. Using GibbsDuhem relationship, the experimental results of this study, and experimental data obtained by strict thermodynamic derivation and calculation in references, the relationships between other thermodynamic properties (εCC, εCCC, εCFe, εCCFe, and εCFeFe) in MnFeC system and temperature were obtained.
关键词:
MnFeC melt;activity interaction parameter;thermodynamic property;carbon;manganese
CHEN Erbao
,
LIU Maoliu
,
WANG Shijun
钢铁研究学报(英文版)
Carbon solubility in FeMn melts (xFe=0102 3-0789 9, xMn=0055 1-0638 0) was measured experimentally at various temperatures. Using GibbsDuhem equation, in combination with the experimental results in this work, quoting experimental data reported in references, and by strict thermodynamic derivation and calculation, the relation equations between the activity interaction parameters in FeC system and temperature were obtained. The calculation equation of lnγFe in FeC system was also obtained. The calculated results show that these relation equations can be used to calculate the activity coefficients of carbon and iron in FeC system and can satisfy the necessary condition to satisfy GibbsDuhem equation and the necessary condition to satisfy the stability condition of system at high carbon content. The calculation formula for lnγC in FeMnC system was also obtained.
关键词:
FeC system;activity interaction parameter;activity coefficient;carbon
张军杰
,
张龙
,
祁长鸿
,
林凤英
,
胡和方
功能材料与器件学报
doi:10.3969/j.issn.1007-4252.2000.01.006
本文研究了共掺Er3+/Yb3+P2O3-B2O3-Al2O3-SrO-BaO玻璃的能量转移过程.实验中制备了高掺杂Yb3+离子的双掺Er3+/Yb3+的磷酸盐玻璃样品.在Er3+/Yb3+掺杂比率>1:18(mol%)时,观测到了基于Yb3+离子至Er3+离子能量转移下Er3+(4I13/2→4I15/2)的增强发射和Yb3+(2F7/2→2F5/2)发射的减弱,当Yb3+离子掺杂浓度超过2.1×1021ions/cm3时(Er3+/Yb3+≤1:18,mol%),由于Yb3+离子的自淬灭效应,Er3+离子的发射强度降低.实验中得到了Yb3+离子的最佳掺杂浓度为1.74×1021ions/cm3.
关键词:
Er3+增强发射
,
非辐射能量转移
,
Yb3+
,
磷酸盐玻璃
李开明
,
李亚洲
,
冯维贵
,
林长
量子电子学报
doi:10.3969/j.issn.1007-5461.2007.05.014
采用非线性反馈控制,用附加了带参数的正弦项对Chen系统进行了有效的控制.随着参数k的逐渐增大,系统的动力学行为呈现出一系列的变化.数值研究结果表明:随控制参数的增大,驱动信号的强度渐大,混沌系统由混沌运动到周期轨道,最终到一相点.
关键词:
混沌
,
Chen系统
,
不动点
,
Lyapunov指数
,
反馈控制
L.F. Li
,
Z.P. Chen
,
M.F. Jiang and W.Z. Wang(Department of Ferrous Metallurgy
,
School of Materials and Motallurgy
,
Northeastern University Shenyang 110006
,
China)(The Technology Center
,
Baoshan Iron & Steel Complex
,
Shanghai 201900
,
China)
金属学报(英文版)
The principle and steps for the calculation of component activities in fluxes using Schuhmann method are described. On the foris of Gibbs-Duhem equation and using Cr2O3 activities in BaO-BaF2-Cr2O3 system fiuxes, BaO activities at 1523 and 1673K are calculated, respectivelg,and the isoactivity diagrums of BaO are also obtained. The calculation results indicate that BaO activity increases with increasing its content in fiuxes, and decreaaes with the increase of Cr2O3 content at a given XBaO/XBaF2 ratio.
关键词:
Shuhmann method fluxes
,
null
,
null
肖凯
,
杨中民
稀有金属材料与工程
制备了30BaO-30Ga2O3-40GeO2-xEr2O3系统玻璃,测量了Er3+在钡镓锗玻璃中的吸收光谱.分别采用488 nm,800 nm和980 nm激发不同浓度Er3+掺杂的玻璃样品,测量了Er3+的4S3/2→4I15/2荧光光谱;并利用488 nm脉冲氙灯激发,测量了Er3+的4S3/2→4I15/2荧光衰减,讨论了Er3+掺杂浓度对4S3/2能级发光强度和荧光寿命的影响.结果表明:随着Er3+浓度的增加,4S3/2→4I15/2荧光强度先增大后减小,在Er3+浓度为1%时出现峰值;而4S3/2能级的荧光寿命呈递减趋势,荧光衰减曲线的非指数成分增加.能量分析表明:Er3+的4S3/2能级和4I15/2能级之间交叉驰豫过程是上转换荧光淬灭的主要通道,而交叉驰豫过程主要源于Er3+电偶极-电偶极间的相互作用.
关键词:
Er3+掺杂
,
钡镓锗玻璃
,
荧光淬灭
Chinese Physics Letters
Er3+-doped and Yb3+/Er3+ co-doped Gd3Sc2Ga3O12 (abbreviated as Er:GSGG and Yb,Er:GSGG, respectively) laser crystals are investigated by using a combination of spectroscopic measurements and thermal characterizations. An absorption peak of Yb, Er: GSGG crystal shifts to 970 nm and its absorption band broadens obviously, which makes the crystal suitable for pumping by a 970 nm laser diode (LD). This crystal also exhibits a shorter lifetime of a lower laser level, a larger emission cross section and higher thermal conductivity than those of Er: GSGG. All these factors suggest that Yb3+/Er3+ co-doping has a positive effect on improving the spectroscopic and thermal performances in GSGG based laser crystals, and imply that double-doped Yb, Er: GSGG crystal is a potential candidate as an excellent LD pumped 2.79 mu m laser material.
关键词:
mu-m;energy-transfer;gsgg laser;er3+;yag;irradiation;absorption;spectra;ysgg;yb3+
