塑料粘结硝基胍炸药的性能

粘结硝基胍炸药的配方为NQ/TNT/PVB 97.5/1/1.5,此配方计为PB-NQ-1。测量了PB-NQ-1的各种性质并和TATB进行了比较。用100毫米直径的炸药,100毫米直径的平面波发生器加上10毫米厚的Comp.B传爆药柱起爆,测量了爆轰参数。爆轰波速度是8.159毫米/微秒,有效C-J爆压是26.2万巴,密度ρ0=1.676克/厘米3。由一维飞片推体试验测得其能量是PBX-9409的65％。从实验数据表明粘结硝基胍炸药的感度和稳定性在通常温度时可以和TATB相比拟,所以它是一种可以替代TATB的便宜炸药。     

酚醛树脂研究新进展

酚醛树脂成本低廉、原料易得、生产工艺简单、综合性能优良,应用非常广泛。在能源与环境问题突出的大背景下,酚醛树脂已超出通用树脂的范畴,除高性能化、功能化以外,生态友好化也是其重要发展方向。本文综述了酚醛树脂在这些方面的新进展,介绍了相关的合成、固化及制备方法,如离子液体法、相分离法、Stober法,这些方法与常规方法相比具有独特的优势;同时介绍了木质素、单宁酸、生物油等生物质基酚醛树脂以及实现酚醛树脂回收再利用的物理、化学、生物方法。     

伽玛辐照对SiGe异质结双极型晶体管的集电极电流和厄尔利电压的影响

 研究了伽玛辐照效应对SiGe异质结双极型晶体管的集电极电流和厄尔利电压的影响。经过10⁴ Gy的伽玛总剂量辐照后,集电极电流和厄尔利电压均增加。另外,辐照后发射结和极电结的开启电压和击穿电压也均有一定程度的减小。以上这些变化均是由于辐照产生的缺陷引起发射区和集电区有效掺杂浓度减小所致。     

基于多项式拟合法的低温监测系统

随着空间技术和超导技术的不断发展,绝缘材料在低温下的电气特性备受关注.针对低温环境中绝缘材料电气性能测试系统,研制了一套采用铑铁温度传感器和铂电阻温度传感器作为感温元件的低温监测系统,并利用多项式拟合的方法有效的对铂电阻温度传感器和铑铁温度传感器的R-T关系曲线进行拟合,从而较精确处理采集数据,达到对试验区域多点温度的...     

Experimental study of K-shell X-ray emission generated from nanowire target irradiated by relativistic laser pulses

K-shell X-ray emission from a Cu nanowire target irradiated by an ultraintense femtosecond laser pulse is studied using an elliptically bent quartz crystal and imaging plate. The designed bent crystal spectrometer has better spectral resolution, which is higher than 1 000. The absolute Kα radiation photon yields are obtained from the experimental results and the Monte-Carlo model. The conversion efficiency of the Cu Kα line is estimated to be 0.019% from the interaction of 4 J, 50-fs laser pulse irradiated on a Cu nanowire target. The high yield of K shell X-ray has important applications in X-ray emission source.     

在核物质中应用Skyrme相互作用计算off-shell单粒子位和有效质量

在N=Z的对称核物质中, 应用Skyrme相互作用计算了复数的off-shell单粒子位. 在本文中我们得到了极化和关联所贡献的单粒子位虚部的解析表达式, 并通过色散关系计算了它们对单粒子位实部的贡献. 同时还研究了有效质量的能量关系.     

用推广的Skyrme力计算微观光学势

本文用同时描述原子核基态和激发态性质的推广的Skyrme力计算了²⁰⁸Pb等核素的微观光学势,并给出了每个核子光学势实部和虚部的体积分和均方根半径,还用所得到的光学势计算了弹性散射角分布和全截面。计算结果表明用推广的Skyrme力计算的光学势无论实部还是虚部比通常的Skyrme力均有明显的改进,在入射能量低于100MeV范围内能较好地符合实验。     

Excitation of surface plasmons at the boundary of overdense plasma

The excitation of surface plasmons （SPs） with a strip grating at the boundary of an unmagnetized overdense plasma has been investigated theoretically and experimentally. An incident electromagnetic radiation was p-polarized at the frequency of 5 GHz. Experiments showed that when the plasma density was four times higher than the critical density with the grating present, and the SPs could be excited at the boundary of the overdense plasma. Contribution of the glass layer in the formation of the SP dispersion relation was examined. When the incident electromagnetic radiation was coupled into SPs the coupling order with the effective permittivity was simulated qualitatively. We find that the existence of SPs at the boundary of overdense plasma indicates that the reflection coefficient of the incident electromagnetic radiation reaches its minimum and even becomes total absorption. In this work the plasma density was diagnosed by a Langmuir double probe.     

Magnetic field induced phase branches of the superconducting transition in two-dimensional square π-loop arrays

Based on the results of explicit forms of free energy density for each possible arrangement of magnetization fluxes in large-scale two-dimensional （2D） square π-loop arrays given by Li et al [2007 Chin. Phys. 16 1450], the field-cooled superconducting phase transition is further investigated by analysing the free energy of the arrays with a simplified symmetrical model. Our analytical result is exactly the same as that obtained in Li＇s paper by means of numerical calculations. It is shown that the phase transition splits into two branches with either ferromagnetic or anti-ferromagnetic flux ordering, which depends periodically on the strength of external magnetic flux φe through each loop and monotonically on the screen parameter β of the loops in the arrays. In principle, the diagram of the phase branches is similar to that of its one-dimensional counterpart. The influence of thermal fluctuation on the flux ordering during the transition from normal to superconducting states of the π-loop arrays is also discussed.     

钾促进的Pt/TiO_2催化一氧化碳氧化

采用水热法制备了TiO_2载体,将其浸渍Pt和不同含量的碱金属助剂K,再进行氢化得到K-Pt/TiO_2催化剂;并将该催化剂用于催化一氧化碳氧化反应.实验结果表明,当K负载量(质量分数)为0.3%时催化剂表现出最佳的催化性能.X射线光电子能谱和储氧能力测试结果表明,碱金属助催化剂K能促进氧空位的生成,增加活性氧物种.适量K的加入能提高Pt的分散度,并提高催化剂催化CO氧化的活性.