几种重要工业沸石概况

介绍了NaA、NaY和ZSM-5等重要沸石的工业合成.讨论了合成中的化学、技术及经济等因素.此外,还描述了SiCl_4脱铝和沸石的成型等过程.     

洪门水电站土石坝反馈分析

反馈分析是一种由结果来反推成因，以了解结构本质或参数的方法，本文在反馈分析研究中首次使用了有限元改进弦法，得出了较优的土石坝反馈计算通式，进而以洪门１９８４￣１９９２年沉陷观测资料作为反馈因子，反馈计算出洪门坝体土料的变形模量基数。     

半导体激光系统整形棱镜的设计

本文根据半导体激光器的发光特性和棱镜的光学折射性质,提出了半导体激光系统中整形棱镜的设计和进行光束质量优化的方法.     

整形滤波在远程核四极共振探测中的应用

讨论了数字信号处理中的整形滤波在远程核四极共振里的应用.在个人计算机上用Turbo-Pascal编程语言实现了整形滤波,并用数值模拟谱和实验数据研究了整形滤波技术在提高测量信噪比方面所起的作用.     

社会需求与中国消防技术的发展

消防技术与社会之间是相互影响的关系,而“技术决定论”的理念只强调单方向作用,在“消防技术的社会形成”(SST)的视野中,重新审视中国消防技术的现状及未来,是更多地关注与技术决定论相反的研究进路。消防技术的社会需求是技术发展的纵向推动力,可以拉动消防技术的发展和进步。技术的形成和发展除具有自身逻辑发展的动力为还会受到社会因素的影响,因此技术的社会需求只说明有这种发展的可能,真正实现某一技术是一个很复杂的问题。但是通过政治、经济和文化三个层面分析社会需求对消防技术的发展起到的作用,在谋求自身逻辑发展与社会需求拉动结合推动中国消防技术时,仍然是很有启发性的。     

Adaptive control of femtosecond laser ablation plasma emission

The influence of temporal pulse shaping on plasma plume generated by ultrafast laser irradiation of aluminum is investigated. Time resolved plasma emission spectroscopy is coupled with a temporal shaping procedure in a closed loop. The ionic emission is enhanced relative to the neutral one via an adaptive optimization strategy. The plasma emission efficiency in case of optimized and ultrashort temporal shapes of the laser pulses are compared, evidencing an enhancement of the ionization degree of the plasma plume. Simplified temporal shapes of the femtosecond laser pulses are extracted from the optimized shape and their corresponding effect on laser induced plasma emission is discussed.     

应用订单教育实现高职双元制培养模式

采用双元制培养模式能加强学生实践能力的培养,有利于高职汽车整形技术专业人才培养目标的实现。在实施双元制培养模式的过程中会遇到很多困难,采用订单教育是克服这些困难的有效途径。     

磷酸法制备木质煤基成型活性炭的工艺条件研究

以煤粉和木屑为原料,不添加粘接剂,采用磷酸活化法制备了木质煤基成型活性炭。利用单因素分析法对成型工艺和活化工艺进行了研究。结果表明:成型炭质前驱体加工最佳工艺为磷酸浸渍浓度30%、木屑:煤粉:磷酸质量比为1∶4∶3,制得的成型炭质前驱体强度为93%。活化工艺为:浸渍比1∶1、活化温度550℃、活化时间2.5 h。成型活性炭亚甲基蓝吸附值为210 mg·g-1、碘吸附值为865 mg·g-1,比表面积1 134 m2·g-1。该方法为煤基成型活性炭的制备找到了新的途径。     

用于半导体激光器的高效能量耦合镜与整形镜

根据波差理论,分析了用于半导体激光器的高效能量耦合镜耦合效率的计算方法,讨论了高效能量耦合镜与整形镜设计方案及装校方法,提供了有关设计参考曲线与参数。     

Rheological behavior of PMN gels for solid freeform fabrication

Lead magnesium niobate (PMN) is a relaxor ferroelectric material and have widespread applications in the manufacture of multilayer electronic devices such as ceramic capacitors, actuators and transducers. The dielectric constant of this electrostrictive material is much higher than the well known ferroelectric barium titanate. However, aqueous processing of PMN is not investigated yet especially for the novel wet shaping fabrication. In this study, concentrated aqueous colloidal PMN gels have been designed to use in the robocasting process. Concentrated PMN suspensions were stabilized by polyacrylic acid and then gelation induced by changing the pH or ionic strength of the suspension or by addition of a cationic polyelectrolyte to the system. Through this procedure it was essential to understand the solid–liquid transition under shear to explore the feasibility of forming without excessive use of polymers. Therefore, rheological response of the samples having a gel network was investigated. Results showed that gelation induced by cationic polyethylene imine or by multivalent salts were successful methods in preparation of PMN gels. However, gelation induced by changing the pH of the suspension was challenging due to ion dissolution from PMN surface.