Orthogonal linear polarized lasers(III) --Applications in self-sensing

In this paper, the applications of orthogonal linear polarized lasers in self-sensing are reviewed. The properties for such a laser include the production of a new frequency in one longitudinal mode spacing, the tuning of frequency difference, the change of polarization states as cavity tuning, the control of mode competition intensity, the optical feedback, and so on. The orthogonal polarized lasers have been used as a laser nanometer ruler based on competition between two polarized lights in a HeNe laser and as a displacement measurement tool based on the optical feedback in the orthogonal polarized lasers. They are also used in the phase retardation measurement of a waveplate, the angle measurement, the vibration measurement, the pressure/force measurement, the weak magnetic field measurement, and so on. The structures of these new devices are simple and compact with the great advantages of high resolution and high accuracy. Some of these devices can trace to the source of the laser wavelength. The nanometer laser ruler is an example whose measurement range is 12 mm, resolution is 79 nm and linearity is less than 5×10^-5. The repeatability of the phase retardation measuring system of waveplate can reach 3′.     

微生物肥料科学研究中几个热点问题

微生物肥料作为一项新的农业措施，在提供绿色食品、保护农业生态环境以及发展高产、优质、高效农业中的作用业已引起国内外学者的普遍重视，为促进我国微生物肥料基础和应用基础研究，作者提出微生物肥料科学研究中值得深入探讨的几个热点问题，如开展寡糖在植物生长中的调节功能与利用研究，应用微生态学与PCPR理论来促进微生物肥料产业的发展，把微生物肥料产业的发展与资源有效利用、环境保护和食品安全等相联系。     

鱼塘水电站溢洪道闸室三维有限元分析研究

利用三维有限元程序,对鱼塘水电站溢洪道闸室进行稳定性、应力及应变的分析.根据闸室不同的运行工况,计算并分析各个部位的应力和应变以及它们的变化趋势;并运用计算数据进行基岩整体稳定性的评价,从而为整个结构的安全评价及结构设计提供了依据.     

基于幅度差平方和函数的基音周期提取算法

为了在任意采样率下都可以高效、准确地进行基音周期提取,提出基于归一化幅度差平方和函数的基音周期提取算法。导出高效计算幅度差平方和函数的方法,时间复杂度是O(N lbN),给出该函数的归一化定义。归一化幅度差平方和函数的取值反映语音信号的非周期性程度,由此定义了基音周期的状态损失函数和转移损失函数,从而能在后处理过程中利用V iterb i算法,确定最优的基音周期序列。实验结果表明:与通用基音提取算法相比,在保证实时性的基础上错误率降低了9.31%,证明使用该算法提高了基音周期提取的准确率。     

Roles of Phe58 residue in stabilizing structure of cytochrome b<Subscript>5</Subscript>

To understand effect of π-stacking interactions between the side chain of aromatic amino acids and the porphyrin ring on structures and properties in cytochrome b₅ (cyt b₅), the Phe58 residue was mutated to tyrosine and tryptophan, respectively by site-directed mutagenesis. The denaturation of cyt b₅ F58W and F58Y toward guanidine hydrochloride was examined by UV-visible and fluorescence spectroscopy. The kinetics of heme transfer reactions between apo-myoglobin and the mutants were studied. The results indicated that the mutation of F58 residue for Y58 or W58 reduced the interaction between of peptide and the heme group, resulting in decrease of the T _m and C _m values of the proteins, increase of the heme transfer reaction rate, and shifts of the redox potential.     

甘氨酸对内毒素部分生物学效应的拮抗作用

在发现甘氨酸是有可能成为内毒素拮抗剂的重要药物之一的基础上,从二个方面进一步观察了Ｇｌ６拮抗ＥＴ的效应。     

参差调谐宽带阵列超声换能器研究

提出用波束等价和采样合成定理对参差宽带阵列进行阵元布阵和波束优化设计的方法．给出根据这一方法进行模拟实验的结果．结果表明，通过等价模拟可得到合理的布阵方案和最优波束分布．在±２０°范围内，模拟精度在１％以内；在主瓣范围±５°以内，实验结果与模拟结果吻合较好．     

固体润滑膜防爬性能试验研究

研究了几种含ＭｏＳ２、石墨的固体润滑膜的防爬性能及不同载荷、速度对爬行的影响，从本质上讨论了产生爬行的原因。结果表明，固体润滑膜的防爬性能优于钢、铸铁。并且指出，静、动摩擦系数差值Δμ越小，其防爬能力越好，静摩擦系数小，出现爬行的倾向也小。     

作用于可变形地基上墩柱底部的波浪渗流力

采用Ｂｉｏｔ固结理论，运用有限元方法研究了波浪和墩柱运动引起的土的响应和海床中的孔隙水压。在计算过程中，用了分开求解和直接求解两种方法，并且针对几种波况进行了对比，结果令人满意。     

基于工艺尺寸树的计算机辅助求解工序尺寸

计算机求解工序尺寸是计算机辅助工艺设计（ＣＡＰＰ）的重要组成部分．本文研究了在ＣＡＰＰ中。建立工艺尺寸树整体计算零件工艺尺寸的方法．该方法能在设计尺寸公差及会量公差核核后计算出零件全部工序尺寸及它们的极限偏差．树形数据结构有利于计算机程序的实现．