Ti3+ ion concentration and Ti:sapphire laser performance

The pulsed and CW laser performance of a range of titanium sapphire laser crystals is reported. Titanium ion concentration in the crystals ranged from 0.07 at.% to 0.25 and 0.41 at.% for some recently developed heavily doped crystals. Values of the crystal figure of merit lay between 30 and 220. Threshold, slope efficiency, tunability, and temporal response are assessed. Comparisons are made with the predictions of a simple rate equation model     

席夫碱结构对Cu缓蚀作用的影响

用自组装技术使席夫碱在Cu表面自组装成膜,用扫描电子显微镜(SEM)、交流阻抗方法及量子化学法研究了席夫碱结构对Cu缓蚀作用的影响.结果表明:席夫碱类化合物在发挥其活性时应以接受电子为主,此类化合物的亚胺或甲亚胺特性基团(-RC=N-)和苯环上的-OH是该类化合物的主要活性区,席夫碱苯环的-H被给电子基团取代会提高对Cu的缓蚀效率,且取代基团越靠进-C=N-,形成的螯合物越稳定,缓蚀效率越高.     

基于FPGA的PCI总线接口设计

论文介绍一种使用PCI宏核逻辑进行高效PCI接口设计的方法。该方法将PCI接口逻辑和PCI用户逻辑集成在一片FPGA里,可以对整个逻辑进行仿真调试,大大缩短了开发周期,提高了系统集成度和性能。文章重点介绍了PCI接口逻辑的结构原理,分析了时序设计的要点,并给出了一种典型应用的软硬件设计方案和仿真结果。     

7CrSiMnMoV钢电火花线切割电参数优化及变质层研究

通过电火花线切割加工7CrSiMnMoV模具钢,对线切割加工电参数和工件表面的变质层进行了研究。利用正交试验的方法对加工电参数进行了优化,电参数优化后的工件表面质量得到提高。在此基础上观察分析了7CrSiMnMoV模具钢线切割后变质层的微观形貌和显微组织,并利用X射线衍射仪对线切割加工试样表面变质层的物相进行了分析。     

重视矿山安全做好矿山建设工程安全设计

近几年来，我国水泥原料矿山的安全事故时有发生。如西南某矿发生滑坡，造成机毁人亡事故；华东某矿发生崩塌，造成多人伤亡事故。重视矿山安全，已是一个十分重要的问题。     

25th Anniversary Article: Interfacing Nanoparticles and Biology: New Strategies for Biomedicine

The exterior surface of nanoparticles (NPs) dictates the behavior of these systems with the outside world. Understanding the interactions of the NP surface functionality with biosystems enables the design and fabrication of effective platforms for therapeutics, diagnostics, and imaging agents. In this review, we highlight the role of chemistry in the engineering of nanomaterials, focusing on the fundamental role played by surface chemistry in controlling the interaction of NPs with proteins and cells.     

Structure modulation of periodic mesoporous organosilicas with organic salts

Journal of Materials Science - The design of the hierarchical structure and geometry of nanomaterials at the molecular and macroscopic level are crucial to determine their properties and...