X-ray spectra induced by Xe-129(q+) impacting the metal surface

Using the slow highly charged ions Xe-129(q+) (q = 25, 26, 27; initial kinetic T-0 <= 4.65 keV/a.u.) to impact Au surface, the Au atomic M alpha characteristic X-ray spectrum is induced. The result shows that as long as the charge state of projectile is high enough, the heavy atomic characteristic X-ray can be effectively excited even though the incident beam is very weak (nA magnitude), and the X-ray yield per ion is in the order of 10(-8) and increases with the kinetic energy and potential energy of projectile. By measuring the Au M alpha-X-ray spectra, Au atomic N-level lifetime is estimated at about 1.33x10(-18) s based on Heisenberg uncertainty relation.

2.6 s isomer of Nd-129

Nd-129 was produced by irradiation of an enriched target of Ru-96 with a Ar-36 beam and studied by using a helium-jet fast tape transport system in combination with X-gamma and gamma-gamma coincidence measurements. A 2.6s isomer of Nd-129 was observed for the first time and tentatively proposed to be the configuration of 1/2[411].

X-ray spectrum emitted by the impact of Xe-129(q+) on Mo surface

We studied the characteristic X-ray spectra produced by the interaction of highly charged ions of X-129(q+) (q =25, 26, 27) with surface of metallic Mo. The experimental result shows that highly charged ions can excite the characteristic X-ray spectra of L-shell of Mo when the beam' s intensity is not more than 120 nA. The X-ray yield of single ion reaches a quantitative level of 10(-8) and increases with the increment of the ion' s kinetic energy and ionic charge (potential energy). By measuring the X-ray spectra of Mo-L alpha(1) the M-level lifetime of Mo atom is estimated by using Heisenberg uncertainty relation.

~(129)Xe~(q+)激发Mo表面产生的X射线谱；X-ray spectrum emitted by the impact of ~(129)Xe~(q+) on Mo surface

研究了高电荷态离子129Xeq+(q=25,26,27)入射金属Mo表面产生的特征X射线谱.实验结果表明,在束流强度小于120nA条件下,高电荷态离子129Xeq+可以激发Mo的L壳层特征X射线谱.单离子X射线相对产额可达10-8量级,特征X射线的相对产额随入射离子的动能和电荷态(势能)的增加而增加.通过Mo原子的Lα1特征X射线谱,利用Heisenberg不确定关系对Mo原子的第M能级寿命进行了估算.

THE TRANSFER OF METAL-IONS ACROSS THE WATER-NITROBENZENE INTERFACE FACILITATED BY NEUTRAL CARRIER ETH-129

The transfer of H+, Li+, Na+, Zn2+, Mg2+ and Cu2+ facilitated by ionophore ETH 129 (N, N, N', N'-tetracyolohexyl-3-oxapentanediamide) across water/nitrobenzene interface has been studied by the cyclic voltammetry. The mechanism of the transfer process has been discussed. The diffusion coefficients and the stability constants of the complexes formed in the nitrobenzene phase have been determined.

钢结构海洋平台整体安全性评估方法研究

本文针对钢结构海洋平台整体安全问题,采用多级评估原理,将平台的承载能力和最后结果作了综合研究,从而既可在结构的整体强度性能方面进行深入分析,又在经济损失方面作了全面考虑,是一种切合工程需要和兼顾社会责任的合理评估方法。

关于可变区域问题的变分法以及广义数学规划问题

本文具体研究了定义在可变区域上或可变边界表面上的泛函的一阶、二阶变分问题，得到了与经典变分法相对应的关于可变区域问题的变分法。并用该变分法讨论了具有可变区域的弹性系统的势能原理。另一方面，与传统的数学规划相对应，研究了可变区域上泛函的约束极值问题——广义数学规划问题，给出了相应的广义Ｋｕｈｎ－Ｔｕｃｋｅｒ条件。

大后掠翼大迎角定常与非定常俯仰气动特性及其控制

对装有"前端襟翼"和"前缘襟翼"的74°后掠三角翼,在迎角0°-90°范围的定常和非定常的空气动力特性驻及襟翼的控制作用作了实验研究。定常流的实验结果与解N-S方程的计算结果作了比较。

S—570扫描电镜两种附属设备的改装

介绍135照相单元自动卷片系统和S—570(2500)电镜压缩机的改装替换。

微机控制实现检测数据的彩色图象显示

计算机控制实现探测数据的彩色图象显示是一种新型的显示技术。在如压力、温度、速度等大面积物理参数的自动探测与彩图显示方面都有广泛应用。做为这种技术的一个应用实例,本文介绍了黑白图象伪彩色编码的实验工作,对实验所采用的方法、设备的特点以及在流动显示等其它方面的应用进行了讨论。