可燃液体爆燃特性及其抑制实验

设计了一套可燃液体爆炸特性实验装置,利用该装置和立式爆轰管对RP-5油料、RP-3油料及工业酒精的爆炸特性、1301惰性气体对这3种燃料的抑制进行了研究。结果表明:RP-5油料、RP-3油料及工业酒精爆炸的体积分数范围分别为1.53%～7.73%、0.82%～7.17%及 3.38%～18.25%;酒精云雾爆轰的临界起爆能为2.11 MJ/m2、爆速和爆压分别为1 609 m/s 、1 480 kPa,爆轰波传播的胞格宽度为14.5 mm,长度为16.2 mm。1301惰性气体对RP-5油料、RP-3油料及工业酒精的最小惰化体积分数分别为6.75%、6.8%及 5.56%;二氧化碳和氮气对RP-3油料的最小惰化体积分数分别为45%和49%;1301惰性气体对油料爆炸抑制效果明显好于二氧化碳与氮气。     

轨下支承失效对直线轨道动态响应的影响

建立了基于Timoshenko梁模型的车辆/轨道耦合动力学模型,分析轨下支承失效对直线轨道动态响应的影响. 钢轨被视为连续弹性离散点支承上的无限长Timoshenko梁,通过假设轨道系统刚度沿纵向分布发生突变来模拟轨下支承失效状态. 推导了考虑钢轨横向、垂向和扭转运动的轮轨滚动接触蠕滑率计算公式. 利用Hertz法向接触理论和沈氏蠕滑理论计算轮轨法向力及轮轨滚动接触蠕滑力. 采用移动轨下支承模型的车辆/轨道耦合系统激振模式,考虑轨枕离散支承对系统动力响应的影响. 通过新型显式积分法求解车辆/轨道耦合动力学系统运动方程,由数值分析计算得到不同轨下支承失效状态下直线轨道的动态响应. 结果表明,轨下支承失效对直线轨道变形及加速度有显著的影响,随着失效轨下支承个数的增加,轮轨相互作用力和轨道部件的位移、加速度将会急剧增大,将加速失效区段线路状况的恶化.      

一种磨损预测的优化算法研究

根据机械部件磨损机理复杂、磨损量预测难精确的特点,提出基于免疫粒子群参数优化的最小二乘支持向量机方法预测磨损量.该算法采用免疫粒子群优化最小二乘支持向量机建模参数,避免了算法陷入局部最优解,实现了精确度高、泛化能力强的磨损量预测模型.对轴承钢试件磨损进行了试验研究,试验数据分析结果表明,基于免疫粒子群的最小二乘支持向量机预测方法优于前向反馈神经网络算法、遗传算法及蚁群算法,预测误差较小,具有很好的预测能力.     

中子输运方程中的α本征值计算

用多群Sn方法(离散纵标法)独立编制了α本征值计算程序,在一定程度上解决了次临界情形下α本征值计算遇到的困难,并对含空腔系统给出了一个简化处理模型.对标准问题的计算表明,该程序算法可靠,计算结果可信.     

离子交换法从醋酸溶液中提取脯氨酸的研究

本文研究了脯氨酸在732,DO01,DH-8三种阳离子交换树脂上的静态吸附特性,发现732树脂的吸附容量最大,速度最快。并选用732树脂,研究了它从醋酸脯氨酸水溶液中吸附脯氨酸的动态过程。最后,以氨水为洗脱剂,考察了不同氨水浓度,洗脱速度对洗脱过程的影响。     

褶合光谱法作抗脱氧核糖核酸突变药物筛选的初步研究[ HS)

采用褶合光谱法考察紫外线致脱氧核糖核酸(DNA)突变,并以褶合光谱差谱值δ的形式量化地表达DNA细微突变的程度,其灵敏度远高于二阶导数光谱法.DNA中添加二甲亚砜后表现的褶合光谱差谱变化与高效毛细管电泳指纹图谱的结果一致.褶合光谱法分析过程简单快速,可以用于抗紫外线损伤、抗突变药物的初步筛选.     

Numerical method of studying nonlinear interactions between long waves and multiple short waves

Although the nonlinear interactions between a single short gravity wave and a long wave can be solved analytically, the solution is less tractable in more general cases involving multiple short waves. In this work we present a numerical method of studying nonlinear interactions between a long wave and multiple short harmonic waves in infinitely deep water. Specifically, this method is applied to the calculation of the temporal and spatial evolutions of the surface elevations in which a given long wave interacts with several short harmonic waves. Another important application of our method is to quantitatively analyse the nonlinear interactions between an arbitrary short wave train and another short wave train. From simulation results, we obtain that the mechanism for the nonlinear interactions between one short wave train and another short wave train (expressed as wave train 2) leads to the energy focusing of the other short wave train (expressed as wave train 3). This mechanism occurs on wave components with a narrow frequency bandwidth, whose frequencies are near that of wave train 3.     

电解法微量溶解氧分析仪校准装置的研制

基于法拉第电解定律研制电解法微量溶解氧分析仪校准装置。利用理论计算确定校准装置的技术指标及水中微量溶解氧浓度的不确定度,经与比色法比对,该装置用于校准微量溶解氧分析仪的可行性得到验证。     

基于labview与容栅传感器的液位测控系统

根据容栅传感器的检测原理,设计了一套基于LabVIEW和容栅传感器的液位精密测控系统,精度达0.05ml。利用容栅传感器输出的电容信号经信号调理模块输入msp430单片机处理并精密控制液位,采用LabVIEW设计系统监控界面程序,实现系统数据的显示、存储、绘图以及人机控制测定仪工作等功能。可配装为数显测定仪和物体密度测量仪,人机界面良好,成本低,易推广。     

Pair Production in Chromoelectric Field with Back Reaction

Massless quark pair production in SU(2) gauge chromoelectric field is investigated by solving the Wigner function with back reaction. The temporal evolution of specific field and its current are obtained self consistently. For the quark distribution function, both its time and momentum dependence are studied. In particular, some interesting phenomena are found, for example, the more abundant symmetry or/and antisymmetry characteristics, the existence of the attractive basin structure and the existence of the momentum "gap" in the quark distribution and so on. All the phenomena are associated with the quark-gluon plasma oscillation, which due to the back reaction effect. The study and analysis qualitatively about the components of the Wigner function are expected to be helpful to deepen the understanding of the QCD vacuum.