解二阶抛物型方程组的再生核函数法

建立了二阶抛物型方程组的一种新数值方法-再生核函数法.利用再生核函数,直接给出了每个离散时间层上近似解的显式表达式,由显式表达式可实现完全并行计算;用能量估计法证明了格式的稳定性及二阶收敛性;给出了一些数值结果.     

朋原子结构与原子辐射理论看玻尔新思维的特征

玻尔提出原子理论过程中的创新思维具有显著的开放性、批判性、辩证性和非逻辑性特征，对当前的科技创新和科学教育有重要的启迪，促使我们对摆脱旧有观念束缚、充分利用直觉思维、恰当处理精确与的关系等问题进行了深入的思考。     

An elliptic problem with critical growth in domains with shrinking holes

We study an elliptic problem involving critical Sobolev exponent in domains with small holes. We prove the existence of solutions which blow up like a volcano near the centre of each hole.     

研究性学习向物理学科教学的扩展

研究性学习,作为一种步入知识经济时代教育发展的产物,具有旺盛的生命力.在我国,只经过了六、七年时间,研究性学习已经由少数试验学校迅速推广到各个地区,应用领域也由原来的作为一门综合实践活动课程扩展到各个学科的教学之中,对象从高中扩大到小学、初中、大学等教育.目前,教育实践中的研究性学习,已经超出了它原来的本意.如何看待教育实践中的这一发展;如何理解研究性学习的概念;如何对研究性学习进行分类;怎样结合物理教学搞好研究性学习;物理教师在研究性学习中怎样发挥更大的作用,就成了需要讨论的问题.     

激光荧光肺癌诊断图象处理系统滤光片的研制

本文论述用于激光荧光肺癌诊断图象处理系统滤光片的膜系设计,制备这套滤光片所采取的工艺措施,最后给出研制的结果。     

Study on the deterioration process of a chromium-free conversion coating on AZ91D magnesium alloy in NaCl solution

The morphology of a chromium-free conversion coating for AZ91D magnesium alloy was observed with an Atomic Force Microscopy. The results showed the uniform conversion coating has a relatively smooth appearance with shallow valleys. The EDX results indicated that the compositions of the coating were mainly compounds of Mg, Al, Mn, P, Ca and O. The XRD result showed that the coating contained amorphous materials and a small quantity of crystalline compound. The pitting product of the coating in NaCl water solution mainly composed of Mg, Cl, Mn, P, Ca and O. The corrosion behavior of the samples in NaCl solution was also studied by electrochemical impedance spectroscopy (EIS), which was characterized by one capacitive loop and one inductive loop. Based upon study on both a mathematical model for Faradic admittance of coating in NaCl solution and EIS, it could be considered that the inductive loop was caused by the adsorption of Cl anion and the appearance of pitting corrosion. A degradation mechanism of the coating in NaCl solution is set forth: dissolution velocity of the Cl⁻ adsorption regions of the coating is higher than those non-adsorption regions, for Cl⁻ anions are selective adsorption at some regions of coating surface. When the adsorption regions of coating layer are penetrated by dissolution, the pitting comes into being. The degradation mechanism of conversion coating and the mathematical model are consistent with the EIS results, polarization measurement results and coating's corrosion test results.     

Advances in differential forms and the A-harmonic equation

In this paper, we first briefly introduce definitions and notations that will be involved in this paper. Then, we summarize current advances achieved in the studies of the A-harmonic equation and differential forms.     

鼻咽癌光谱诊断系统中的荧光光谱信号处理

利用激光诱导荧光技术开发了用于早期鼻咽癌诊断的自体荧光光谱系统系统由风冷氩离子激光器、自行研制的单色仪和高灵敏度、智能化的信号采集和处理系统组成文中重点讨论了系统中自体荧光光谱信号的处理技术,其中包括荧光光谱信号的分光和检测技术,以及用LabVIEW开发的信号处理和控制平台荧光光谱信号的处理结果表明:系统不仅实现了荧光光谱信号的同步显示,而且极大地提高了信号的信噪比,这为系统的临床应用奠定了的基础.     

激光血管外照射治疗可行性研究

为探讨激光血管外照射治疗的可行性,测试了人活体血管外照射以及模拟血管内照射的光能流率分布情况。研究表明,激光血管内、外照射的总光能流率的平均值分别为10.81W/cm²与1.11W/cm²,两者相差一个数量级。为获得血管内照射相应的光能流率,建议采用20mW632.8nmHe-Ne激光;垂直入射于人皮肤外表:尽可能选择血管暴露的病人或较为暴露的血管;选择被照射血管直径为6mm左右。本实验结果,特别是在人活体血管内探测到的实验数据,将有益于光在人体组织内传播特性的研究。