Low cycle fatigue and creep behavior of recrystallized Molybdenum near room termperature

The deformation behavior of pure recrystallized molybdenum under cyclic and static loads was investigated in the temperature range between 30°C and 10O°C, for stress amplitudes between 100 MPa and 250 MPa and for static loads up to 200 MPa. The results show that in spite of the low test temperatures and stress levels the Mo material exhibits considerable plastic strains which depend sensitively on frequenez and small changes in temperature.The activation energy deduced for the static and dynamic deformation is less than 0.98 eV which indicates thermally activated processes, to be explained by a dislocation kink model as described in the literature. The low-temperature fatigue behavior appears strongly influenced by creep-fatigue interaction phenomena.     

分割电极片状压电致动器——(二)位移特性及狭缝宽度对其影响的实验研究

研究了悬臂梁式分割电极片状压电致动器的位移特性。理论分析表明，分割电极狭缝宽度会减小致动器自由端的位移输出，但当狭缝宽度小于致动器电极宽度的１０％时，可忽略狭缝宽度的影响。致动器端部位移的测试结果大于理论计算值。与现有磁头悬浮臂尺寸相近的致动器，在２０Ｖ～５０Ｖ的电压驱动下均可获得１μｍ～２μｍ的致动位移。对９８５０道／厘米的密度磁盘，该位移能覆盖至少一个磁道宽度，满足磁头定位两级伺服系统对第二级致动器位移的基本要求。     

半导体激光器用铷D2线光电流谱稳频

本文报导了用铷原子７８００Ａ光电流谱来稳定半导体激光器的工作，在光电流谱线的中部发现了有利于稳频的凹陷，将半导体激光器频率锁定在凹陷的中央，估算的频率稳定度为１ＭＨｚ。     

1.48μm掺饵光纤放大器泵源

采用Ｐ型ＩｎＰ衬底新月型结构制备了１．４８μｍ大功率激光器，该激光器与单模光纤耦合输出功率大于４０ｍＷ。     

丙烯酸树脂涂料的近期进展

介绍了丙烯酸树脂涂料的国内外发展的概况及其性能和应用.提出了我国发展丙烯酸树脂涂料的建议。     

铁磁偶合的Gd（Ⅲ）Cu（Ⅱ）配合物──组装分子基铁磁体的一种重要元件

铁磁偶合的Ｇｄ（Ⅲ）Ｃｕ（Ⅱ）配合物──组装分子基铁磁体的一种重要元件缪明明，廖代正，王耕霖（南开大学化学系天津３０００７１）摘要分子基磁体的设计是自然界向化学家挑战的一个热点课题。铁磁偶合的Ｇｄ（Ⅲ）Ｃｕ（Ⅱ）配合物是组装分子基磁体的一种重要元件。...     

铝对W9Mo3Cr4V高速钢组织和硬度的影响

用Ｘ－射线仪，扫描电镜和透射电镜系统研究了铝对钨钼系高速钢铸态，退火以及淬回火组织的影响，铝含量超过２．０％，淬火组织中出现含析出合金的铁素体组织和晶界屈氏体，导致钢硬的降低。     

具有初曲率板弯曲的边界元分析

由于具有初曲率板弯曲问题的控制微分方程较复杂，直接求解原问题基本解推导边界积分方程较为困难。本文通过引入等效荷载，将此问题的控制微分方程化成与普通板弯曲基本方程形式相同的微分方程，利用一般求解板弯曲问题的边界元法迭代求解，建立了分析具有初曲率板弯曲问题的边界元法。算例表明本方法理论准确、精度良好。     

Dynamic structure-soil-structure interaction by FEM and BEM

The dynamic interaction, through the underlying or surrounding soil, between three-dimensional structures has been investigated, by coupling finite and boundary elements. The structures are discretized by finite elements, and the infinite soil is represented by boundary elements. A harmonic force is applied on both mass-lumped structures and mass-distributed structures. On the basis of our numerical studies, we further indicate the effects of distance, direction of alignment between two foundations, bedrock, natural frequency of the system and the location of load on the dynamic responses of structure-soil-structure interaction systems.     

γ辐照保藏甜杏仁的研究

介绍了~(60)Co γ射线对甜杏仁杀虫灭菌的研究。结果表明,杀死甜杏仁表面上虫卵的适宜剂量为3.5kGy,常温下可保藏7个月以上,完好率为100％,微生物可减少99％以上。可安全越夏保存。辐照甜杏仁的主要化学成份未发生明显变化。