飞秒贝塞尔光束直写铌酸锂高深径比光子晶体结构

具有深微孔结构的铌酸锂晶体可以成为具有优良光波选择性调制功能的光子晶体器件。然而,目前使用的聚焦离子束刻蚀、化学刻蚀或常规激光制孔等方法很难获得光子晶体所需的高深径比微孔。本文基于飞秒脉冲高峰值功率、超短脉宽的基本特点,通过对光束进行贝塞尔整形以及对光束与铌酸锂晶体的相互作用进行调控和研究,用飞秒单脉冲在铌酸锂晶体内部一步制备出深径比约为700∶1的大面积均匀微孔阵列。测试结果表明,设计并制备的高深径比微孔阵列光子晶体结构对450～510 nm波长范围内的光束具有明显的选择透过性。     

LD端面抽运全固态声光调Q228.5nm深紫外激光器

采用三镜折叠V型谐振腔、声光调Q技术和三硼酸锂（LBO）晶体,对二极管端面抽运Nd∶YVO₄的914 nm基频光进行腔内倍频,实现了457 nm激光输出,利用I类相位匹配偏硼酸钡（BBO）晶体对457 nm蓝光进行腔外倍频,获得了228.5 nm深紫外激光。当抽运功率为17 W时,获得了平均功率为10 mW的228.5 nm深紫外激光输出,脉冲宽度为64.26 ns,重复频率为10 kHz。2 h内的激光输出稳定度为±2%。     

提高普通低碳钢冷镦性能的工艺研究

本文分析比较了普通低碳Q195钢与冷镦钢生产工艺、性能组织等情况,对武钢目前生产的Q195钢进了取样冷镦试验,并进行了不同的控冷工艺轧制试验.提出在武钢目前炼钢生产条件下,采用适当的轧制工艺,完全可以用普通低碳Q195钢代替部分铆螺钢.     

SHAPE MEMORY EFFECT OF PU IONOMERS WITH IONIC GROUPS ON HARD-SEGMENTS

SMPU （shape memory polyurethane） non-ionomers and ionomers, synthesized with poly（c-caprolactone） （PCL）, 4, 4＇-diphenylmethane diisocyanate （MDI）, 1,4-butanediol （BDO）, dimethylolpropionic acid （DMPA） were measured with cyclic tensile test and strain recovery test. The relations between the structure and shape memory effect of these two series were studied with respect to the ionic group content and the effect of neutralization. The resulting data indicate that, with the introduction of asymmetrical extender, the stress at 100% elongation is decreased for PU non-ionomer and ionomer series, especially lowered sharply for non-ionomer series; the fixation ratio of ionomer series is not affected obviously by the ionic group content; the total recovery ratio of ionomer series is decreased greatly. After sufficient relaxation time for samples stretched beforehand, the switching temperature is raised slightly, whereas the recovery ratio measured with strain recovery test method is lowered with increased DMPA content. The characterization with FT-IR, DSC, DMA elucidated that, the ordered hard domain of the two series is disrupted with the introduction of DMPA which causes more hard segments to dissolve in soft phase; ionic groups on hard segment enhance the cohesion between hard segments especially at high ionic group content and significantly facilitate the phase separation compared with the corresponding non-ionomer at moderate ionic group content.     

扫描探针纳米加工技术的现状与发展趋势

介绍了扫描探针纳米加工技术的基本原理、应用前景和最新进展 ,并讨论了该技术的发展趋势     

中国层控矿床地球化学研究

层控矿床是指那些局限于一定地层并与岩浆活动没有直接联系的矿床。沉积矿床一般不包括于层控矿床中,尽管它也受地层控制。“中国层控矿床地球化学”课题研究的最终成果包括专著三卷(1984、1987、1988)和研     

Electrochemical Characteristics of Mg0.9Ti0.1-xZrxNi （x=0.02, 0.04, 0.06） Alloys

Mg-based hydrogen storage alloys Mg0.9Ti0.1-xZrxNi (x=0.02, 0.04, 0.06) were successfully prepared by means of mechanical alloying (MA). The effects of Zr addition on the discharge capacity and the cycle performance of the Mg-based electrodes were also studied. It was found that the discharge capacities were improved with addition of a small amount of Zr and the cycle performances of the alloy were stabilized with the addition of Ti. The effects of surface modification or coating on the properties of Mg0.9Ti0.06Zr0.04Ni were also studied. The results indicated that coating with graphite improved both the discharge capacity and cycle life of the amorphous Mg0.9Ti0.06Zr0.04Ni electrode.     

四元Mg0.9Ti0.1Ni0.9X0.1(X=Mn,Zn,Co,Fe)系列合金的制备及性能研究

用机械合金化法合成了Mg0.9Ti0.1Ni0.9X0.1(X=Mn, Zn, Co, Fe)系列合金. X射线衍射(XRD)结构分析表明, 用X部分替代Ni后, 促进了Mg0.9Ti0.1Ni合金的非晶化过程. 用Co和Fe部分替代Ni提高了合金的放电容量, 但却降低了合金的循环稳定性. 用Zn和Mn部分替代Ni提高了合金电极的循环寿命, 尤其是Mg0.9Ti0.1Ni0.9Zn0.1合金电极经10个充放电循环后, 其放电容量仍可达到313.8 mA·h/g. 对添加Co后的合金进行p-c-T测试发现, Mg0.9Ti0.1Ni0.9Co0.1合金的吸放氢容量明显比Mg0.9Ti0.1Ni合金高, 这与电化学所测到的结果一致.     

一种新的与微型化自发电池整合的电化学发光检测芯片研究

为实现微流控芯片电化学发光检测的微型化,开展了微型自发电池与微流控芯片的整合研究.设计并制作出一种简易、实用的微型化电化学发光检测芯片.初步的分析应用说明了以上设计的可行性.本文结果对催生完全自主性的微型化芯片实验室具有积极的意义.