空间编码与灰度投影相结合实现高效3-D形貌测量的研究

介绍了一种结合空间编码与灰度投影来实现高效三维形貌测量的方法。用空间编码完成对被测空间的粗略编码,用灰度投影完成精确编码,将它们结合起来得到被测物体表面丰富的编码信息,作为一种基于三角法的三维形貌测量方法,能够在物体表面非常不连续和外部光照造成的背景光强分布不确定的情况下工作良好。同时,与传统的空间编码方法相比,它大大提高了空间编码的效率。实验表明,该方法用５ 幅图像取得了与灰度码１０幅图像相当的测量结果。     

阳离子交换型聚合物AQ薄膜修饰碳纤维电极及伏安行为

本文成功地制备了Eastman-AQ-55D聚合物修饰碳纤维电极,用循环伏安法探讨了一些实验参数的影响,并对Ru(NH₃)₆³⁺、甲基紫精进行了分析,结果表明,AQ-55D修饰的微电极稳定性好,修饰方法简单,灵敏度和选择性都有一定的提高,Ru(NH₃)₆³⁺、甲基紫精的峰电流与浓度在1.2×10^-6～1.2×10^-5mol/L、1.7×10^-6～1.4×10^-5mol/L范围内呈线性关系,其相关系数分别为0.999、0.998.利用此电极测定了几种离子在膜中的扩散系数.     

A Microscopic Calculation of Nucleon-Antinucleon Bound States

A microscopic study of nucleon-antinucleon (N N) bound states is achieved starting from the relativistic Pauli-Schrödinger equation for q³q³ bound states. From this equation, a complex off-shell qq one-gluon-exchange potential is derived. Use of this potential and the resonating group method to calculate the NN bound states leads to results which are useful to analyze some of the NN experimental data reported in recent years.     

电活性质点Fe^2^+离子在六氰亚铁钒薄膜中的传输

电活性质点Fe^3^+可穿透六氰亚铁钒薄膜在玻璃碳基体电极表面于较负电位处直接氧化, 也可经VHF膜中氧化还原点位的媒介在较正电位处理膜-溶液界面及膜内部发生催化氧化. 两个过程分别在用VHF修饰过的旋转GC电极上的伏安曲线中产生, 可明确分辨的第一波和第二波. 第一波的极限电流受Fe^2^+离子在溶液中和膜中的扩散速率控制.VHF薄膜对Fe^2^+离子的透过能力, kDm/d, 为10^-^3-10^-^2cm.s^-^1数量级, 随膜厚度增大而减小, 不随溶液中Fe^2^+离子浓度改变.     

脲基氨基甲酸酯化合物的合成及应用研究

在轿车发动机的燃烧室中以及发动机进气系统的汽油喷嘴上,汽油往往因高温及废气的酸性物质作用而产生沉积物,尤其是在喷油嘴上会产生结焦,甚至堵塞喷油嘴,使汽车不能启动运行［'－'j．采用优化发动机设计的办法,对改善沉积物和结焦作用不大,而在汽油中加人汽油清净分散剂却能产生较好的效果．目前,美国加人清净分散剂的汽油已占90％,深入研究新型、高效的清净分散剂已成为研究的热点．按化学结构汽油清净分散剂大致分为两类"－'：（l）小分子胺类,如N一苯硬脂酷胺、单丁二醋亚胺、双丁二酚亚胺和1,3一三甲撑二胺类等;（2）低聚…     

Effect of Intersubband Coulomb Interaction on Hot-Electron Transport in Two-and One-Dimensional Electron Systems

We study the hot-electron transport properties of model GaAs-based quasi-two-dimensional(-quantum-well) and quasi-one-dimensional'(quantum wire) systems having two occupied subbands by using the Lei-Ting balance-equations for two types of carriers. Both the intersubband electron-phonon interaction and intersubband Coulomb interaction are taken into account. Our numerical results show that when the electron density is high enough, the intersubband Coulomb interaction is substantially strong in thermalizing the electrons between the different subbands. As a consequence, the one-type-of-carriers model (OTCM) is a good approximation for electron transport. However, in the cases of the lower electron densities, the intersubband Coulomb interaction is not strong enough to fire the electrons in differents-ubbands to share a common electron temperature and a more accurate two-types-of-carriers model (TTCM) must be used for analysis.     

Solar Neutrino Problem in Seesaw Model

A specific texture for the Dirac and Majorana mass matrices in the seesaw model leading to a pair of almost degenerate neutrinos is discussed. This texture can be obtained by imposing a global U(1) symmetry. This model could solve the solar neutrino problem through the MSW mechanism and offer the hot component of the dark matter of the universe which requires Σm_vi = 7 eV.     

NaBH4/BiCl3复合体系还原芳香硝基化合物为氧化偶氮苯及其类似物

NaBH4/BiCl3复合体系在甲醇介质中对硝基化合物进行部分还原,可以获得相应的氧化偶氮苯类化合物。实验中发现此反应与反应底物的Hammett常数有着密切的关系。     

Electrochemical Probe of Hydroxylation of 4-Nitro-phenol by Cytochrome C with Hydrogen Peroxide

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用条带织构装饰技术研究液晶全芳共聚酯B-N的取向和非取向膜

用条带织构装饰技术研究液晶全芳共聚酯Ｂ—Ｎ的取向和非取向膜董炎明（厦门大学化学系,厦门,３６１００５）关键词共聚芳酯,条带织构,退火,取向膜,微纤全芳共聚酯Ｂ—Ｎ在分子量较高时能出现黑白相间的条带织构［１～５］,但分子量低时由于极易松驰,不能用普通剪...