试样研磨对铜合金主要元素分析结果的影响

本文从砂带，研磨方法，试样表现状况三个方面，分析了试样研磨对铜合金主要元素测试结果的影响。     

Experimental Study of Capillary Effect in Porous Silicon Using Micro-Raman Spectroscopy and X-Ray Diffraction

We investigate the capillary effect and the residual stress evolution in the wetting, drying and rewetting stages of porous silicon using x-ray diffraction and micro-Raman spectroscopy. A reversible capillary effect and an irreversible oxidation effect are the driving forces for the residual stress evolution. The lattice expansion of the porous-silicon layer is observed to decrease slightly by x-ray diffraction and the tensile residual stress increases rapidly by micro-Raman spectroscopy, with the change of about 82 MPa for the oxidation effect and the change of 2.78 GPa (enough for cracking) for the capillary effect. Therefore, the capillary effect plays a major role in the residual stress evolution in the stages. A simple microscopic liquid-bridge model is introduced to explain the capillary effect and its reversibility. The capillary emergence has a close relation with a great deal of the micro-pore structure of porous silicon.     

类氖锗X光激光双程放大实验研究

本文在神光装置上,进行了类氖锗X光激光双程放大实验研究.实验中使用了硅/钼多层膜X光平面反射镜.用平场光栅谱仪测量了X光激光的时间积分和时间分辨信号.实验证实了X光激光的双程放大.时间积分结果表明,双程放大为单程放大信号的5倍多;时间分辨结果表明,对多层镜的作用时间作修正后,双程放大信号的增强倍数还要大.在本实验条件下,多层镜的寿命约为400—700ps.     

同步辐射小角X射线散射研究

应用同步辐射小角X射线散射研究了二醋酸纤维素接枝聚甲基丙烯酸甲酯在二氯甲烷和甲醇4:1的混合溶剂中的尺寸和形态. 结果表明接枝共聚物在溶剂中形成单分子微球. 微球的尺寸随支链的长度增加而增大.     

高能中子消失法的检验

以前在贫化铀／聚乙烯／铁组合球装置上进行的高能中子消失法的检验，存在的问题在于贫化铀内腔太小，距离的微小误差就会对实验结果产生很大影响，实验重复性差。因此用同样是中子增殖材料的铍代替贫化铀作补充实验。这样，一则可以减小因为距离的偏差对实验的影响；二则可能对^197Au(n，γ)、^198Au反应的影响再做研究。用铍／聚乙烯／铁组合球装置，在ns-200加速器上照射，用HPGe探测器测量．Au，Al，Nb高阈能指示剂的活化γ射线，确定它们在装置中的反应燃耗，以此检验高能中子消失法。     

适合于应用实验的X射线激光探针

X射线激光实验研究的主要目的是进行相应的应用研究。由于具有波长短、脉冲短、亮度高、相干性好的优点，因此在很多领域有潜在的应用前景。在所有的应用中，利用X射线激光作为探针来诊断等离子体或其他介质材料方面的应用是最普遍的。一般来说，激光探针穿越等离子体或介质后，光束的强度、前进方向、光程都会发生变化。分别检测这些变化，就可以获得等离子体的电子密度或介质折射率的相关信息。这就需要对作为探针的X射线激光的输出特性有深入的了解，并且选择更合适的条件进行优化。采用场图测量的方法，即直接测量X射线激光的输出光束在某一位置处的截面光强分布，能够很好地提供关于X射线激光输出光束的全面的信息，对应用研究具有很好的参考和指导作用。     

Excited Stated in ^207Rn

Excited states ^207Rn are investigated via the^196Pt(^16O,Sn)^207 Rn reaction at beam energies from 85 to 95 MeV using techniques of in-beam γ-ray spectroscopy.Measurements of γ-ray excitation function,x-γ and γ-γ-t conincidences are performed with ten BGO(AC) HPGe detectors.Based on these measurements,a level scheme of ^207Rn,including 17 γ-rays and 18 levels,is established.Spins for most of the levels are proposed according to the measured DCO ratios.The level struccture is compared with a weak-coupling calculation using the interaction energies extracted from neighbouring nuclei.     

高灵敏度X光探测系统

对高灵敏度X光探测系统结构和灵敏度进行了阐述，给出了厚度差为0．1mm的铜台阶在低照射量下的透视图像及处理结果，证明了系统具有高的灵敏度。