河道对爆破地震波传播规律的影响分析

跨河道传播爆破地震波的问题在水电工程建设中较常见,通过理论分析,计算了爆破地震波通过河道水体时的透反射情况,通过动力有限元数值模拟,讨论了河道内有水和无水两种情况下,地震波通过基岩传播引起的两岸地面质点及河道表面质点的峰值震速分布情况.通过数值模拟结果可知,在爆破地震波跨河道传播中,不考虑水体影响时岩体内各点的峰值震速较考虑水体影响情况下的峰值要大.理论计算结果和不考虑水体影响时的数值计算结果是偏于安全的.     

全光纤VISAR系统中条纹常数的分析

全光纤VISAR系统具有大的测速范围,其测速的动态范围和条纹常数有关。从干涉光路的实现原理出发,推导出速度与条纹常数的关系式,并分析了FVISAR系统不同速度分档下的条纹常数确定。在保证1．5％精度及假设光源相干长度为1 mm的前提下,给出了具体的速度分档情况。     

脉冲筛板柱萃取分离钍鈾的研究(Ⅰ)——钍铀分离脉冲筛板柱的流体力学性能

在2英寸脉冲筛板柱中,结合钍铀分离的Thorex过程,研究了30％TBP-煤油/水和30％TBP-煤油/Th(NO_3)_4-UO_2(NO_3)_2-HNO_3-H_2O体系脉冲筛板柱的流体力学性能。通过实验对液泛通量、分散相存留分数等流体力学参数,并用改进的Pratt公式对两相流体力学流体力学行为进行了关联,得到了较为满意的结果。通过对脉冲筛板柱流体力学性能的研究,获得了最优操作条件,为进一步的传质实验研究奠定了基础。     

Carrier-concentration dependence of velocity-field characteristics in ln0.53Ga0.47 as

The doping dependence of the velocity-field characteristic in InGaAs has been investigated by an analysis of measurements with transferred-electron devices. The electron peak velocity has been determined directly as a function of electron concentration and low-field mobility. The carrier-concentration dependence of the velocity-field characteristic has been deduced by comparing experimental and theoretical transient device behaviour. The experimental results support a theoretical approach for the velocity-field characteristic which has been proposed recently.     

黑索今两种压药方式的比较

该文从药柱装填密度、密度梯度等方面进行分析,讨论了黑索今压药方式对雷管起爆威力的影响,建议采用定压压药方式压制黑索今药柱.     

Energy Balance in Dynamic Fracture, Investigated by a Potential Drop Technique

A puzzling question in dynamic fracture has been why cracks in amorphous brittle materials always travel at velocities smaller than the Rayleigh wave speed. The answer is that the energy per length needed for the crack to propagate depends strongly on velocity. As the energy flux to the crack tip increases, the crack chooses new modes of dissipation such as micro-cracking and the creation of subsurface damage zones to dissipate this energy. In this paper we use a potential drop technique to measure length and velocity of a crack with high spatial precision and time resolution so as to investigate the modes of dissipation in Homalite-100 and make qualitative comparisons with PMMA. The technique is capable of resolving crack initiation, run, and arrest. Using this technique we search for a 'forbidden band' of velocities in PMMA, Homalite-100, and glass, and we show that no such velocity gap exists in these amorphous materials at room temperature.     

转炉熔池溅渣动力学

文章依据氧枪的射流特性，论述了溅射作用机理。并根据泡沫渣溅起高度的实验式，依据２氧枪的氮气流量、枪位高度及氧枪喷孔夹角，可计算出溅渣高度。对氧枪副孔及复吹择溅渣的影响也进行了理论分析     

海关集装箱检测用电子直线加速器聚焦线圈磁场设计与测试

介绍了在电子直线加速器粒子动力学基础上进行聚焦线圈轴向磁场的设计；利用ＬＩＮＥ－ＡＣＣ／ＰＣ程序模拟计算，给出了不同初始发射度情况下满足束流包络要求的各种聚焦磁场数据。对已经加工好的聚焦系统进行了磁场分布测量，并将实际磁场与理论计算进行了比较。上述工作为确定聚焦线圈的设计方案和加速器的出束实验提供了可靠、丰富的数据。     

球形破片对对人员的杀伤威力研究

建立了球形破片对避弹衣和人体侵彻的数学模型，并以此为基础提出了新的杀标准，用此新标准计算杀伤面积和进行球形靶实验比较简便，并与战场实际相符。     

Thin oxide films of silicon by high pressure oxidation

High pressure oxidation of silicon was performed at an oxidation temperature range of 650 to 800°C for thin oxide films with about 300 å thickness. The index of refraction was dependent on an oxidation temperature but independent of the oxidation pressure as 1.475 at 750°C. The dielectric breakdown strength of the oxide film was measured by the voltage ramping,method. The fixed oxide charge about 1.0 × 10¹¹ cm^?2 was also measured from the high frequency C-V measurement. The pulse scanning C-V measurement technique was used to measure the minority carrier generation rate in the depleted surface. The surface generation velocity was slightly dependent on the oxidation temperature and indicated that the fast surface states increased with decreasing oxidation temperature.