Combination of coating and heat treatment processes

For a proper use of coated tools and components excellent coating properties as well as excellent substrate properties of the coating/substrate composite are necessary. A well known example is the load support of hard steel substrates for thin wear resistant coatings. Therefore coating processes must be combined with heat treatment processes of the substrates, whereby several practical processing constraints like order and compatibility of the applied treatment procedures must be considered. The combination of CVD-coating plus laser beam hardening is an example of a post coating heat treatment. Applications may be possible for large forming tools made of high alloyed tool steels, which nowadays are usually through hardened after CVD-coating. Laser beam hardening offers the possibility, to harden only the highly loaded edges of the tools. The advantages of this combination are short process time, less distortion and compressive residual stresses in the substrate surface. CVD-coatings can endure laser beam hardening with suitable parameters. The influence of CVD TiN-coated steel substrates and laser beam hardening parameters on microstructures and properties of coating/substrate compounds have been investigated. Special attention was paid to overlapping hardening zones, which may occur at the start and end points of a laser hardened track. In summary, the combination of coating and heat treatment processes show a high potential to produce coating/substrate compounds with excellent coating properties as well as excellent substrate properties.     

大庆油田北一二排西部二类油层宽分子量分布聚合物驱油效果研究

大庆油田萨中开发区北一二排西部上返二类油层聚合物驱区块为一套陆相河流-三角洲碎屑岩沉积,由于二类油层渗透率、孔喉半径、有效厚度分布相对于主力油层均匀,适宜采用分子量分布宽度指数较大的中分子量聚合物驱油,可提高聚合物驱油效果。经室内岩心模拟实验,采用分子量分布宽度指数为23的中分子量聚合物进行二类油层聚合物驱油,相对普通中分子量聚合物可以多提高采收率1．2个百分点。     

高功率DPL光束质量研究

为了在高功率DPL中获取高光束质量输出激光，利用扭转模获取高光束质量种籽源的同时，进行了高重复频率下的热致及光致双折射效应的补偿、高功率二极管均匀泵浦聚光腔设计及相位共轭镜用于改善激光系统光束质量等特性研究。最终获得了重复频率40Hz、单脉冲能量大于400mJ、近衍射极限的高光束质量激光输出。这种方法对高功率激光系统的设计十分有用。     

束流测量中的工频陷波器

提出了一种应用于电子束曝光机束流测量中的自动跟踪工频陷波器，给出电路结构，基于对其工作原理的分析，介绍了提高陷波器跟踪精度的设计要点及调试方法。     

Effect of dose rate and length of storage on the ESR signal strength in irradiated chicken bone

One hundred and twenty-five pairs of chicken drumsticks were randomly allocated to one of five dose rates: 5, 10, 15, 20 or 600 kGyh-. The highest dose rate was obtained using a linear accelerator whilst the remaining dose rates were provided using a ⁶⁰Co gamma source. Each batch of 25 pairs was further divided into groups five of which were stored at 4°C for 0, 7, 14, 21 or 28 days. ESR spectroscopy was used to measure the intensity of the radiation-induced signal. There was a quadratic relationship between ESR signal strength and dose rate, which although statistically significant is unlikely to be of practical importance. The magnitude of the ESR signal declined by about 20% over the first 14 days of storage at 4°C and thereafter the decrease was minimal.     

轻型钢结构吊车梁设计方法及节点构造

通过分折和研究单层门式刚架轻型钢结构厂房中的吊车梁设计，总结了轻型钢结构吊车梁的设计方法和节点连接构造，对合理设计吊车梁，降低用钢量提出了设计建议。     

冶金厂房钢吊车梁设计中一些问题的探讨

对双层翼缘板焊接工型钢吊车梁的某些受力特征、吊车梁的支座节点连接构造设计等进行了较详尽的分析,提出了满足冶金工业厂房大跨度、大吨位吊车梁系统受力和工艺要求的方法.     

电子束和离子注入处理鸡冠花种子对当代(Mo)植株生长发育影响的初步研究

利用电子束和氮离子、氢离子注入处理普通鸡冠花干种子,试验结果表明,两种诱变处理均能显著抑制鸡冠花植株的生长、发育,并能有效地诱发花性状变异,变异株率可达0.5%—2%。电子束处理鸡冠花干种子的半致死剂量(LD50)经测定为1.2kGy左右;离子注入处理的半致死剂量随注入离子种类不同而不同,N 注入的半致死剂量(LD50)为1.6×1017/cm2,H 注入的半致死剂量应低于1.6×1016/cm2。鸡冠花干种子电子束处理的适宜剂量为1.5kGy左右,离子注入处理的适宜方法是N 1.6×1016/cm2。同时鸡冠花对高剂量辐照较不敏感,是一种耐强辐照的资源。     

浅谈先张法预应力空心梁板施工质量通病的分析和防治

通过对先张法预应力空心梁板施工时容易忽视和发生的几个质量通病产生原因的分析，并结合工程实际和工作体会，粗略探讨了防治这些质量通病的一些措施和方法。     

Numerical simulations of cantilever beam response with saturation control and full modal coupling

Numerical simulations of the response of a uniform, cantilever beam subjected to a base excitation are performed. A saturation absorber is implemented to control the beam response. In previous investigations of similar configurations, the inertial and structural properties of the piezoelectric actuators have been neglected, resulting in an analytical model of a uniform beam. This investigation includes the nonuniformities in the beam properties that are introduced when piezoelectric actuators are bonded to the uniform beam. The resulting coupling between uniform, cantilever beam modes is fully included in the analytical model. It is shown that this modal coupling has a significant effect on the beam response, which is not present when modal coupling is neglected.