正交电磁场中的康普顿与汤姆逊散射

本文讨论了正交电磁场中康普顿和汤姆逊散射。结果表明强电扬的介入会显著地改变这种散射的性质,具体的数值计算表明对于光学厚源,存在一康普顿散射的透明“窗口”,使逃逸出来的光子呈右旋偏振,这可作为未来观测对用康普顿散射解释γ射线爆能谱的一个重要判据。     

High Electromagnetic Field Enhancement of TiO2 Nanotube Electrodes

We present the fabrication of TiO₂ nanotube electrodes with high biocompatibility and extraordinary spectroscopic properties. Intense surface‐enhanced resonance Raman signals of the heme unit of the redox enzyme Cytochrome b₅ were observed upon covalent immobilization of the protein matrix on the TiO₂ surface, revealing overall preserved structural integrity and redox behavior. The enhancement factor could be rationally controlled by varying the electrode annealing temperature, reaching a record maximum value of over 70 at 475 °C. For the first time, such high values are reported for non‐directly surface‐interacting probes, for which the involvement of charge‐transfer processes in signal amplification can be excluded. The origin of the surface enhancement is exclusively attributed to enhanced localized electric fields resulting from the specific optical properties of the nanotubular geometry of the electrode.     

CFRC/HAP 生物活性复合材料及其生体适应性

对比了羟基磷灰石（ＨＡＰ）不同粉体、不同方式渗入的涂层。采用ＳＥＭ、ＩＲ和ＥＤＳ法分析了碳纤维增强碳（ＣＦＲＣ）－羟基磷灰石（ＨＡＰ）复合材料的复合结构，以及在真空热处理条件下ＨＡＰ的结构稳定性。提出了真空包渗－后真空烧结技术及超重力场填充－后真空烧结技术，获得ＣＦＲＣ基体表面层复合ＨＡＰ生物活性成分的新型生物材料（简称为ＣＣＨ生物材料）。经生物学测试与埋植验证，该材料具有良好软组织和硬组织适应性。     

水平电磁连铸电磁场及屏蔽效应的数值计算

本文给出了水平电磁连铸过程电磁场的数学模型。利用有限元法计算了其中的涡流场及电磁力场，并探讨了屏蔽板的导电性能和磁场频率对屏蔽效应的关系，为水平电磁连铸装置的设计提供了基础。     

恒定场电磁参数计算的变分法

本文讨论了互补变分原理在电磁参数计算中的应用 ,提出了恒定场中基于互补变分原理的电参数的计算方法 ,最后给出了计算实例。图 1 ,参 3。     

调速系统设计中电动机参数的测定

阐述了直流电机固有参数的测量对于直流调速系统设计的重要意义，给出了直流电机固有参数的测量方法和计算公式     

PBT／PET的组成与混溶性及物理机械性能的关系Ⅰ．非晶状态下混溶的判据

PBT/PET共混体系是一种结晶/结晶聚合物共混体系,除熔融状态外,通过骤冷或其他处理,还可得到玻璃体等非结晶态。本文研究它们处于非结晶态的相溶性问题,用动态粘弹谱仪、差示扫描量热等进行考察,取得处于非晶状态下的PBT/PET体系彼此相溶的实验判据。     

计算三维电磁散射的矢量场表面辐射条件算子

本文利用矢量场的辐射边界条件(Radiation Boundary Condition,简称RBC)推导出矢量场的一阶辐射条件算子,并介绍了该算子在三维电磁散射计算中的应用。文中应用该算子在散射体表面的性质,近似计算了理想导电圆球的表面感应电流分布和雷达散射面积。数值计算结果与级数展开解一致性较好。     

通电自感线圈内外的能流

本文探讨通电自感线圈内、外能流的传播情况.当能流输入线圈内时,立即转变为圈内电磁能的增加.圈内电磁能减少时,立即转变为能流的输出.     

On a kinematic compatibility equation related to elastic stress-free joints and crystal twins

Consider the kinematic compatibility equation QFR = F(I + a n).Here Q and R are two 3×3 matrices representing two rotations, F is a 3×3 matrix with det (F) > 0, I is the 3×3 identity matrix, a and n are two vectors in the 3-dimensional Euclidean space R ³, and a n is the direct product. Assume F and R are given, and we solve for Q, a, n. We will first present a new proof of a criterion, due to Professor Jerry Ericksen, to be met by F and R for the existence of non-trivial solutions. Then we will give sufficient and necessary conditions for F and R under which the equation has solutions of special properties that are related to compound twins and multiple twins in crystals.