聚氯乙烯／线性低密度聚乙烯共混体系的相容性

用动态力学分析（ＤＭＡ）和傅利叶变换红外光谱（ＦＴＩＲ）研究了氢化聚丁二烯－ｂ－聚甲基丙烯酸甲酯（ＨＰＢＤ－ｂ－ＰＭＭＡ）共聚物增容剂对聚氯乙烯（ＰＶＣ）与线性低密度聚乙烯（ＬＬＤＰＥ）共混体系的增容作用．增容剂使共混物中两相的玻璃化温度发生变化，说明其相容性增加．ＦＴＩＲ的结果表明，增容剂中羰基与ＰＶＣ的α氢形成氢键，使ＣＯ，Ｈ─Ｃ及Ｃ─Ｃｌ的振动频率变化，峰形加宽．     

超级铝热剂的制备、表征及其燃烧催化作用

用纳米铝粉和纳米氧化铅、纳米氧化铜和纳米三氧化二铋为原料,采用超声分散复合的方法,制备了纳米超级铝热剂Al/PbO、Al/CuO和Al/Bi₂O₃。采用X射线粉末衍射(XRD)、扫描电镜及能谱分析(SEM-EDS)和红外光谱(IR)对原料和产物的物相、组成、形貌和结构进行分析表征;运用差示扫描量热仪(DSC)评估三种超级铝热剂与双基推进剂主要组分的相容性;研究了3种超级铝热剂对双基推进剂燃烧性能的影响。结果表明,Al/PbO、Al/CuO和Al/Bi₂O₃与推进剂主要组分硝化棉(NC)、硝化棉/硝化甘油(NC/NG)混合物和吉纳(DINA)的相容性均良好,而与黑索今(RDX)和1,3-二甲基-1,3-二苯基脲(C₂)相对较为敏感;含三种纳米超级铝热剂的双基推进剂表现出优异的燃烧性能。     

基于自顶向下技术的轴承设计研究

骨架模型是Pro／ENGINEER中自顶向下设计产品的重要工具。论述采用骨架模型进行产品设计的基本步骤,然后介绍骨架模型应用于轴承设计的详细步骤,为实现产品的多样化和系列化设计提供了设计技巧和依据。     

New OSL detectors based on LiMgPO4 crystals grown by micro pulling down method. Dosimetric properties vs. growth parameters

Rod-shape crystals of the LiMgPO₄ compound were grown by micro pulling down technique under the different growth conditions. Influence of the different growth rates, thermal setups and gaseous atmospheres on the crystals dosimetric properties was investigated. Samples were irradiated with ⁹⁰Sr/⁹⁰Y β particles and optically stimulated luminescence spectra were measured with the automatic Risø TL/OSL-DA20 reader. The sensitivity level, repeatability, dose–response dependence and short-time fading were compared for all grown crystals. It was found that the crystal grown from the iridium crucible was about three times more sensitive to radiation as compared to the crystal grown from the graphite crucible. Also the radio-sensitivity measured for the crystals grown from the graphite crucible was higher in case of higher growth rates. It was also shown that the residual OSL signal measured one and two weeks after the irradiation was higher for the crystals grown with higher growth rates. There was also no correlation observed between the growth conditions and the level of dose–response nonlinearity. Over the studied dose range the response nonlinearity of the studied samples fluctuated around over a dozen percent, regardless of the applied growth parameters. The obtained results tend to suggest that LiMgPO₄ crystals may be considered as promising dosimeters in different fields of research.     

刘三姐虚实考

从传说的本源性及广东阳春铜石岩石刻考察,刘三姐实有其人,其初始是民间杰出歌手。铜石岩石刻是迄今唯一可信的记载真实刘三姐信息的文献,其后600多年几乎无文字记载,全凭口耳相传。明、清及其后所记载的刘三姐,属后人传说中之演绎、兼容、虚构及衍生,仅是一种多元民俗文化的意象和载体,不可混淆于本真刘三姐,学术界当明确界定。     

论青少年成人仪式的传承——以中日两国为视角

成人礼，这一在中日两国同源分流的传统民俗仪礼，既是对青少年社会责任感的锻铸，也是对其社会公共事物处理权限的赋予。成人礼在中日两国不同的历史时期都有其不同的表现形态，较之原始社会的成年礼仪，现在的成人礼仪无疑是象征性的，但其文化内涵仍然保留了下来。成人礼对青少年的责任教育有着不可低估的影响和作用，而这一过程也是传统仪礼资源现代转型的一个缩影。     

Quantum analysis on the four-photon interference

We present a theory for quantum interference of four photons generated by spontaneous parametric downconversion. Detailed investigation of the dependence of fourfold coincidence count rate on time delay between the incident and the reflective pump laser pulses is carried out. Gaussian type dependence is found, and good agreement between our theoretical results and experimental data reported in the literature is achieved.     

组合结构连接部分的有限元法处理

本文讨论了有限元法计算平面组合结构时,对杆板连接部分变形谐调条件的处理.利用逆步变换的概念,提出了构造能够满足该条件的过渡单元的方法.计算表明这种处理方法是合理和有效的.     

贱金属电极与PTC陶瓷相容性的研究

用烧渗法和化学沉积法在冰箱启动用PTC陶瓷上制作了Zn/Cu、Ni—P/Cu和Cu/Ni—P双层贱金属电极,并对它们的电学性能进行了测试.结果表明,Zn/Cu和Ni—P/Cu贱金属电极能较好地满足PTC陶瓷产品的要求,而Cu/Ni—P电极可用来调节PTC陶瓷的室温电阻率.