快速淬冷自动测试实验台的研制

介绍了一种新型高速淬冷装置的设计原理和研制,该测试台可以实现弹射速度的无级调节和沉浸速度准确测量,将其运用于研究球状小样品在液氮（ＬＮ２）中的超快速冷却,可实现较高的沉浸速度和冷却速度,发现随着样品直径的减小、液氮过冷度的增大,沸腾的最大热流密度和最大冷却速度急剧增大。     

牛体外受精卵发育培养条件的研究

将采自屠宰母牛卵巢的未成熟卵子在含有促进性腺激素和胎牛血清的TCM199培养基内培养成熟后,使用以钙离子载体Ionophore A23187诱导获能的牛精子进行授精处理.在受精卵发育用培养基中添加了谷氨酰胺,并以此与无添对照进行了对比,探索了培养基内谷氨酰胺的存在与否对胚胎发育的影响.另外,在发育用培养基内还分别添加了胎牛血清(FCS),阉牛血清(NSS)以及发情母牛血清(OCS)以观察其培养效果,结果表明,谷氨酰胺对胚胎的发育有极大的促进作用,添加谷氨酰胺的处理组与对照组中发育为桑椹胚、囊胚的胚胎比例分别为23.4%和6.6%,具有极显著的整异.而在含有FCS、NSS和OCS的TCM199培养基内培养的卵子中分别有81.4%,70.7%和82.9%发育为二细胞期胚胎,将胚胎继续培养至授精后第8天时,三个处理组中发育为桑椹胚、囊胚的胚胎比例分别为30.0%,40.2%和47.1%,以OCS的培养效果为最佳.本研究的结果证明,谷氨酰胺和发情母牛血清对牛体外受精卵的体外发育具有良好的促进作用.     

等离子喷涂层的断裂力学性能测试研究

应用单边缺口三点弯曲(SEN)、双悬臂梁法(DCB)和短棒法(SB)三种测试技术研究等离子喷涂ZrO_2陶瓷和WC-Co金属陶瓷涂层的临界应变能释放率G_(IC),测定了各方法的柔度标定试验计算公式,得出WC-Co类涂层G_(IC)高于ZrO_2类,内聚型(Cohesive)断裂的G_(IC)高于粘着型(Adhesive)断裂的G_(IC),粉末粒度细、涂层孔隙度低、裂纹少的涂层均使G_(IC)提高,显示G_(IC)对涂层显微结构特征变化较常用的拉伸粘着强度试验法敏感。认为DCB法和SB法有较为严格的理论基础,SB法测定简单易行,数据集中,能敏感地反映断裂类型的特征;DCB法可于一根试样测出多个G_(IC)值,有利于对涂层性能进行统计可靠性评价。涂层断裂力学研究可为选择粉末、优化涂层工艺和指导涂层设计提供主要依据。     

河网水质模型及其数值模拟

本文研究了河网水质数学模型．该模型不仅反映了网状河道中非稳态的水流及水质变化特点，还反映了水体分别处于好氧、缺氧、厌氧状态下的水质及底泥中主要污染物的变化规律．模型中的参数都是在分析机理的基础上通过实验室和现场实验得到的．文中还研究了模型的动态耦合数值计算方法，应用实际资料验证模型，取得良好的结果．本模型已用于为改善无锡河网水质而进行的水量、水质调控方案的研究中．     

平板紊流边界层探讨

本文是笔者已发表的“管中紊流新探索”一文的继续，笔者用该文提出的关于脉动切应力的假设，求解平板紊流边界层问题，给出了计算边界层厚度、位移厚度、动量厚度和能量厚度的公式和表格，所得的绕平板的阻力系数，无论在紊流水力光滑区，或是在紊流水力粗糙区，全与现有实验成果非常符合，对从水力光滑到水力粗糙的过渡区，本文提供的算法是首创．     

对一对等值同号电荷电力线图的探讨

本文对国内外许多普通物理教材中所给出的一对等值同号电荷的两种不同形状的电力线图进行了分析,从而指出这两种不同的电力线图实质上都是正确的,而在这些教材中对电力线性质的归纳却是不完备的,忽视了奇异点的特殊性。     

X射线荧光光谱模拟标样法测定古代青铜钱币中的铅铜锡

在X射线荧光光谱分析中缺少标样时,使用模拟标样来代替真实标样作出校正曲线,求出一套α系数来校正基体效应。用此法分析了古代青铜钱币中的Pb、Cu、Sn,结果是满意的。     

Effect of one-step aging on microstructure and properties of a novel Al-Zn-Mg-Cu-Zr alloy

The effect of one-step aging temper on the mechanical properties,electrical conductivity and the microstructure of a novel Al-7.5Zn-1.6Mg-1.4Cu-0.12Zr alloy has been investigated.The results indicated that with elevating the aging temperature from 100°C to 160°C,the aging response rate was greatly accelerated,and the UTS at peak aging condition decreased,while the corresponding TYS increased.However,the electrical conductivity of the alloy became higher.After aging for 24 h at 120°C,the peak UTS and TYS values were achieved as 591 MPa and 541 MPa,respectively;but the alloy achieved a lower conductivity,20.4 MS/m.When T6 temper was performed at 140°C for 14 h,the UTS decreased only by 1%of the former,whereas the TYS and the electrical conductivity increased obviously,which were up to 559 MPa and 22.6 MS/m,respectively.The major strengthening precipitates of the peak-aged alloy were GP zones andη′phase.The precipitates in both the matrix and the grain boundary became coarser with rising aging temperature.There were obvious PFZs along the grain boundary both in T6 conditions aged at 140°C and 160°C.     

Anisotropic plastic deformation behavior of as-extruded ZK60 magnesium alloy at room temperature

The anisotropic plastic deformation behavior of as-extruded ZK60 magnesium alloy at room temperature(RT)was investigated by compressive and tensile testing in different directions,i.e.the loading axis oriented at 0°,45°and 90°to the extrusion direction.The relationship between texture and plastic deformation behavior were examined.The results show that the extruded ZK60 alloy exhibits a strong ring fiber texture.The mechanical properties are strongly orientation dependent.In tension testing,the 0°specimen exhibited higher yield strength and lower elongation.In compression testing,however,ZK60 alloy exhibited almost the same yield strength in three directions.The anisotropic plastic deformation behavior is due to strong fiber texture and the lower symmetry of the hexagonal close packed(hcp)structure of ZK60 alloy. The correlation between texture and mechanical behaviour offers the possibility to improve the mechanical properties of magnesium alloy by optimization of the material production process.     

旋量算法及其应用

介绍了旋量算法技术及其应用.这个技术与螺旋度振幅、色分解、对偶性、KLT关系等技术相结合,可以在微扰论的树图和圈图水平上,对非阿贝尔规范理论、超对称、弦理论及引力-规范理论对偶等方面的研究发挥重要作用.