太阳位置(0,0) 时刻t天体位置(xiy)速度( Viy) ix, iy. r2=x2+y2,加速度大小a=k/(2), 加速度矢量( ai)-la- ti+1=+ d: Vi+1,=Vix+aixd Vi+1,y=Viy+aixd; 从初始位置和初速度开始,一段段画出轨道

The physico-chemical behavior of rare earth elements in low sulphur 16Mn steel and their ability to enhance the corrosion resistance of the steel in sea water studied in this paper. The results indicate that Ce and La in 16Mn steel all have the abilities such as deoxidation, desulphidation, refining grains and cleaning grain boundaries and matrix etc. The anodic and cathodic polarization curves show that the rare earth elements added in 16Mn steel enhance the corrosion resistance of the steel in sea water

采用简单工艺,制备出以8%Y2O3(摩尔分数)稳定的ZrO2为固体电解质,La0.8Sr0.2CoO3混合导体材料为扩散障碍层的极限电流型氧传感器.该传感器能够很好地给出全范围空燃比的极限电流平台,与小孔或多孔极限电流型传感器相比,具有结构简单、响应快、工作可靠、成本低廉等优点

针对高镧稀土添加剂对16Mn钢的夹杂物、力学性能的影响进行分析研究,并与富铈稀土添加剂进行对比.实验表明,高镧稀土添加剂能有效变质16Mn钢中的夹杂物,减少夹杂物的数量,改善钢的力学性能.当La/S(质量比)为2.5时,综合力学性能达到最佳值.高镧稀土添加剂能有效替代富铈稀土添加剂进行稀土钢的开发

通过对西藏弄如日金矿主要矿石类型的岩矿相鉴定,主要组成矿物的扫描电镜/能谱(SEM/EDS)、电子探针(EPMA)和激光消融剥蚀-等离子体-质谱(LA-ICP-MS)分析,研究了该矿床的矿石矿物组成、金的赋存状态和工艺特性.结果表明:金主要以独立金矿物形式呈细粒-微细粒、不规则粒状产于黏土矿物粒间或黏土矿物与石英粒间,成色高(992～996);另有少量以\不可见金\的形式赋存于黄铁矿和毒砂中,\不可见金\对矿石金品位的贡献较小.银主要呈超显微包裹物,赋存于磷酸盐矿物中.在对自然金和载金矿物的粒度统计分析的基础上,对载金矿物在各种类型矿石中的质量分布进行了估算

研究了空气-乙炔火焰原子吸收测定包头铁矿及其冶炼渣中钙时的干扰及其消除方法。采用混酸(硝酸+氢氟酸+硫酸;硝酸+盐酸+氢氟酸+磷酸+硫酸)分解和抗坏血酸与La3+(或+Nb(V))联合消干扰剂,有效地消除了共存组分的干扰,建立了操作方便、结果可靠的分析方法

基于对9个侧边二元系RECl3-SrCl2、RECl3-LiCl、SrCl2-LiCl(其中RE:La、Ce、Pr、Nd)热力学数据和实验相图信息的优化、评估,以及三元系相关热力学性质的分析,计算并讨论了RECl3-SrCl2-LiCl系列4个三元系相图

It is described that the effectual way to construct phase diagrams is the combination of computer calculation with some critical measurements. Examples of application to the CuO-RE2O3 （RE. La, Y, Nd）, Na2B2O4, K2B2O4 and PrCl3-CaCl2-MgCl2 systems are given

In this paper the phase diagrams of LaCl3-LiCl and CeCl3-LiCl systems have been experimentally determined and theoretically calculated. Bath are simple eutectic systems. The eutectic points are at 25mol% LaCl3, 508℃ and 27mol% CeCl3, 494℃, respectively. The optimized phase diagrams and thermodynamical data of LaCl3-LiCl and CeCl3-LiCl systems with self consistency are a better basis for constructing ternary phase diagrams

La2O3一CaF2二元系熔渣的粘度