乙酸2-辛基十二烷醇酯的合成及其谱学研究

本文以乙酸和2－辛基十二烷醇为原料，以磷钨酸为催化剂，合成了乙酸2－辛基十二烷醇酯，酯化率为92.0%，对产物进行了红外光谱分析及核磁共振波谱分析。     

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.     

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.     

RESONANCE CONTRIBUTION TO 1s-2s ELECTRON-IMPACT EXCITATION OF He+ ION

In the frame of quantum defect theory, the resonance excitation cross sections of 1s-2s electron-impact excitation of He⁺ ion are calculated by a simple relativistic configuration interaction method. The present theoretical results are in agreement with the previous experimental measurements .     

非光滑叶片对叶栅流道内通道涡影响的实验研究

在低速平面叶栅风洞中对光滑叶片叶栅及三种非光滑叶片叶栅进行了实验研究,以研究 与光滑叶片相比,非光滑叶片对叶栅流道内通道涡发展变化的影响。实验结果表明,与光滑叶片相 比,非光滑叶片对叶栅流道内的通道涡有明显的影响,通道涡的位置沿节距方向移向流道中心处, 沿叶高方向不变,通道涡的强度有所减弱。分析了非光滑叶片的影响原因。     

FexMn1-x合金在GaAs(001)表面外延的结构和磁性

报道了对于0≤x≤1的Fe_xMn_1-x合金在GaAs(001)表面上分子束外延的结构与磁性的实验结果,当x>0.8时,Fe_xMn_1-x合金以单晶体心立方结构生长;当x<0.35时,则以单晶面心立方结构生长;对于0.35xMn_1-x生长的结构比较复杂,而正是在这一区域中,该合金发生了从铁磁相到反铁磁相的转变. 关键词：     

MODELING AND SCALING OF CHIELECTRIC RELAXATION OF NONLINEAR OPTICAL POLYMERS IN FREQUENCY DOMAIN

chielectric relaxation theory was demonstrated, chielectric relaxation that selectively probes chromophore reorientation in the frequency domain was described by the Havriliak Negami(HN) function, chielectric spectra of several nonlinear optical (NLO) polymers were fitted well by the HN function. To describe the scaling of chromophore reorientation relaxation in frequency domain, two-shape parameters m and n describing the low- and high- frequency wings of the chielectric spectra need to be specified, besides the chielectric characteristic relaxation time τ and the chielectric strength Δχ⁽²⁾. From the temperature dependences of m and n of NLO polymers, the relations between the chromophore relaxation and the a relaxation of the polymer host have been revealed.     

基于空间二进制编码的3-D形貌测量方法

介绍了一种基于空间二进制编码的非接触3-D形貌测量方法.它用一台LCD投影仪对被测物体表面进行空间编码,再用一台CCD摄像机获取物体编码信息,最后用三角法原理从摄像机图像中获取三维形貌数据.提出了基于三角法的空间二进制码的重要特性,描述了高效编码的构造方法.用这个构造方法构造出一个完全数字化的7位字长的二进制编码.基于这种编码的3-D形貌测量方法在被测物体表面非常不连续和非构造的环境下取得了良好的测量结果.     

激光诱导击穿空气等离子体光谱及半经验理论模拟

利用Nd∶YAG激光器输出的1 064 nm激光进行了激光诱导击穿空气光谱实验,测量了空气等离子体的时间分辨光谱。基于局域热动力学平衡模型,建立了模拟激光诱导击穿光谱的方法。对700~900 nm波段的空气等离子体光谱进行了模拟。通过模拟结果与实验结果的比较,进一步估算出了空气中氮、氧和氩的相对含量。     

并行建表化学加速算法研究及其在气相斜爆轰模拟中的应用

采用详细化学反应机理对气相斜爆轰问题开展数值计算时,由于组分之间的特征时间尺度相差很大,反应源项的直接积分(direct integration,DI)求解通常存在强烈的刚性及非线性现象,导致计算量很大.为了在不损失计算精度的基础上有效减少化学反应过程的计算时间,针对包含2H2+O2详细机理的二维斜爆轰并行计算,提出两...