真空扩散焊接(VDW)法制作扩散偶在研究原子扩散中的应用

利用扩散偶来研究碳、氮原子和氧原子在钢中的扩散是一种很有用的方法［１］。本文作者利用真空扩散焊接工艺来制作扩散偶，并为此设计制作了一台小型真空扩散焊接设备。已使用这种方法制作的扩散偶研究了碳、氮原子在不同成分钢中的扩散规律，并测出了这些原子的扩散系数。     

超声参差宽带阵优化指向特性的计算机模拟

应用声压迭加原理，得到了参差调谐超声宽带基阵换能器的声压响应函数及声压指向特性，并应用波束等价的方法对波束分布的指向特性进行了优化模拟研究．通过对较优波束指向特性进行模拟，可以得到一个具有较优指向特性、布阵合理、阵元频率可参差调谐的宽带阵列换能器的布阵方案，为超声基阵换能器的设计提供了一个新途径．     

紧Lie群上的高阶Riesz变换

讨论了紧Ｌｉｅ群上的高阶Ｒｉｅｓｚ变换并给出了高阶Ｒｉｅｓｚ变换的奇异积分表示．     

金刚石磨粒切削运动分析及切削厚度计算

在分析金刚石锯片刀头运动轨迹的基础上，根据金刚石锯片的切削运动方程，得出了金刚石磨粒最大切削厚度的计算公式，提出了切削过程中两个新的观点：（１）单颗粒金刚石锯切掉的岩石其水平距离是不变的；（２）切削厚度是按正弦规律变化的，这给锯片设计和正确使用提供了可靠的依据     

Spectrum characteristics and pump wavelengths of Nd3+-doped double-clad fiber

Conclusion The optimum wavelength of Nd³⁺-doped double-clad fiber laser or amplifier made in China is near 830 nm. The efficiency of Nd³⁺-doped double-clad fiber devices pumped by 820-nm laser is low due to ESA. In order to increase the photochemical stability of the outer cladding, the material of the outer cladding must be advanced.     

Studies on the reaction between Laccase ando-methoxyphenol by microcalorimetry

The reaction between Laccase ando-methoxyphenol have been studied by LKB-2107 batch microcalorimetry system. Thermodynamic parameters Δ _r H _m , ΔG _o , ΔG _T ^≠ and kinetic parameters (K _m ,k ₂) have been determined. The process of the reaction has been analyzed from changes in energy by using the transition state theory. Two methods for enhancing catalytic power of Laccase are proposed. The results shown that formation of an enzyme-substrate complex is “anticatalytic”. The enter and sole source of catalytic power is the stabilization of transition state; reactant-state interactions are by nature inhibitory and only waste catalytic power. Supported by the National Natural Science Foundation of China Wang Tianzhi: born in 1968. Ph D