扩散方程基本解的积分处理

详细讨论了时间相关热交换问题扩散方程基本解的时间积分特性，给出了完整的解析处理及相应级数展开表达式，并提出采用按时段构造的时间单元局部化基本解作为边界元法的加权函数，从而显著减少可动边界问题边界元解法的存贮量和计算时间。     

低环径比托卡马克堆中的α粒子输运

基于当前等离子体物理，本文初步讨论了低环径比托卡马克堆中等离子体的特征。在自洽的低环径比堆芯参数下，计算了α粒子约束和损失，以及不同环径比对它们的影响。     

Calculation and Optimization of the Effective Extinction Cross Section of the Spherical Cold Obscuring Smoke

The smoke is often generated in the battlefield by the smoke ammunition to protect the personnel and equipment against the enemy's optoelectronic systems. The effective extinction cross section is an important parameter of the infrared smoke ammunition. In this paper, the relationships between the effective extinction cross section of a cloud of spherical smoke and the mass of the smoke agent, the radius of the screening smoke and the mass extinction coefficient are discussed. The expressions of the maximal effective extinction cross section is derived. This research will help us to achieve optimal design of the smoke ammunition and to appropriately evaluate the effectiveness of the smoke. Examples are given for two kinds of obscurants.     

用于扩展目标自适应光学校正的相关波前传感器的理论和实验

研究了使用非相干、扩展光源的波前误差测量技术，分析了使用强度透过串型像面掩模的扩展目标相关波前探测原理，讨论了模拟目标的选择问题，探讨了根据目标图像生成像面掩模图像、进而制作像面掩模的方法，给出了所生成的像面掩模图像的典型结果，进行了以强度透过率型掩模为特征的单子孔径扩展目标波前传感器原理实验，比较了两种不同掩模的波前探测效果，获得了与理论分析一致的实验结果。     

Field-induced functions of porous Si as a confined system

Electroluminescent porous Si (PS) diodes exhibit various useful functions under a high-electric field. The experimental PS diodes are composed of thin semitransparent metal films, PS layers (about 500 nm thick in minimum), p- or n-type Si substrates and ohmic back contacts. Definite nonlinear electrical behavior (negative resistance and nonvolatile bistable memory effects) and cold electron emission phenomena appear in these PS diodes associated with the EL emission. Both the negative resistance and memory effects are related to the charging of Si nanocrystallites by field-induced carrier injection. The electron emission observed in the PS diodes formed on n+–Si substrates is caused by hot electrons tunnelling through the top contact. By an appropriate structural control of PS, the effective drift length under a high-field conduction is significantly increased, and then electrons are emitted ballistically. These functions reflect the activity of PS as a nanocrystalline confined system.     

Influence of root resistivity on plant water uptake mechanism,part I: numerical solution

The issue of water flow through the root zone of field crops represents a complex problem requiring knowledge of a large spectrum of phenomena from various disciplines. Although many investigations have been devoted to gain better understanding of water dynamics in the root zone, the problem is still insufficiently understood. The main objective of the presented work was to analyze the importance of root water resistivity in the plant water extraction process. The problem was solved numerically for a wide range of the soil–root conductivity ratio (SRCR). Two different types of root water uptake (RWU) mechanisms were obtained. The first one is related to low root resistivity or low SRCR, and, thus, exhibits a so-called “moving uptake front” (MUF) effect observed previously in several experimental studies. The second one is inherent in large values of root resistivity or high values of SRCR (larger than 10⁴), and is strongly dependent on the root density distribution. Deceased.     

Calorimetric and nuclear byproduct measurements in electrochemical confinement of deuterium in palladium

We present the results of a new experiment with our multicell set-up implemented with mass spectrometric measurements of⁴He and a highly improved neutron detector. The excess heat measured is comparable with the results of other laboratories, but no neutrons were found and the tritium excess was lower than expected from the power excess. ⁴He has been measured in the electrolysis gases and a tentative correlation of ⁴He with excess power is presented and discussed.     

紫花地丁中汞的原子荧光法测定

利用还原气化的非色散型装置，以湿法消解的方式，建立了原子荧光测定紫花地丁中痕量汞的测定方法，同时比较了不同玻璃仪器的洗涤方法和不同的定量方法，试验回收率在86．9％－110．8％之间，误差＜8．5％，通过对实际样品的测定，得到了满意的结果。