Vibration Analysis of Digital Radiography System for Large Container Inspection

The cantilever vibration characteristics of a digital radiography system were analyzed to predict the effect of vibration on the performance of a mobile container inspection system. The static deformation,vibration mode and natural frequency of the cantilever of the digital radiography system were calculated with the ALGOR Finite Element System to verify the strength and rigidity of the cantilever. The maximum amplitude of the cantilever vibration occurs as it starts accelerating. The predictions show good agreement with test results, indicating that the finite element model of the cantilever structure accurately models the mechanical characteristics.     

两年承教 终生受益——清华大学物9班（1959届）同学怀念夏学江老师

今年的春节刚过,便传来夏学江老师去世的噩耗,我们心里十分悲痛．在与他最后告别的会场上,我们留校的老物9班同学去了不少．回忆起夏先生对我们的辛勤栽培以及他那深厚的物理底蕴和崇高的敬业精神,我们的一个共识就是：他是我们大学时代几位使我们终生受益的好老师之一.     

大型客体X或γ辐射成像阵列探测器的研制

介绍了大型客体Ｘ或γ辐射成像对阵列探测器的技术要求以及国内外现状，超高压阵列电离室的设计、结构、工艺以及主要性能，说明这种阵列探测器在集装箱探测系统中的应用并给出得到的Ｘ—辐射投影图像。     

工业核仪表的现状与发展

本文介绍了工业核仪表的现状与发展,重点介绍了强度测量型工业核仪表、能量分析型仪表、数字图象处理型仪表和其它同位素仪表的国内外有关情况。