青蒿素和类似过氧化合物的过氧基团振动频率的确认

青蒿素(arteannuin)是中药青蒿中抗疟的有效成分,它是一种含有过氧基团的新型倍半萜内酯,在红外光谱中的强吸收谱带831,881,1115cm~(-1)为过氧基团的特征振动频率.Philpotts等对870cm~(-1)附近的强红外吸收谱带为过氧基团振动频率曾提出疑点,特别是叔过氧基团化合物,它在800～900cm~(-1)范围内产生的强谱带归属于一C—O—基团的振动.而且过氧基团两侧取代基结构不同也将影响谱带的改变,拉电子基团会导致振动频率的波数增大,而推电子基团则使频率向低波数位移.本文用激光拉曼光谱并辅以红外光谱进行研究,比较了700～900cm~(-1)各谱带的谱型,相对强度和退偏振比等数据,并排除了倍半萜环振     

稀土冠醚配合物的激光拉曼和红外光谱

本文观察了各个硝酸稀土与15-冠-5(1)、18-冠-6(2)生成的配合物的激光拉曼和红外光谱。配位体的C-O-C红外伸缩振动频率向红移,提供了两者发生配位的迹象。轻、重稀土配合物的不同光谱特征主要取决于配合物水合与否的不同空间构型。875cm~(-1)附近峰属于稀土离子与冠氧原子配位后的金属-氧环伸缩振动,它仅存在于轻稀土无水配合物中。     

气相CBr2的激光诱导荧光光谱

本文报道了在交叉分子束装置中氟原子和二溴甲烷反应生成的CBr2的气相激光诱导荧光光谱的首次实验结果。位于585-664nm范围内的激光诱导荧光光谱由22个峰组成,被指定为CBr2的A(V1'V2'0)←X(000)(V1'=0,1; V2'=0-12)跃迁。从光谱导出v00=14885cm^-^1, 上态振动光谱常数v1'=460, v2'=189cm^-^1, x12'=3.10,x22'=-0.27cm^-^1。本实验结果与CBr2的低温固相光谱进行比较, 发现固相光谱较气相光谱明显蓝移, 确认了CBr2是F+CH2Br2过程的两步反应的产物。     

Enhancing the Fibre Matrix Adhesion of Natural Fibre Reinforced Polypropylene by Electron Radiation Analyzed with the Single Fibre Fragmentation Test

The effects of electron radiation on natural fibre reinforced polypropylene have been analyzed with the single fibre fragmentation test. Specimens of single hemp, flax, ramie and cotton fibres/fibre bundles embedded in a polypropylene sheet were irradiated with electron radiation of 10 MeV with intensities of 5, 15 and 33 kGy. The radiation led to a strain reduction of the polypropylene but did also improve the adhesion between polymer and flax, hemp and cotton fibres/fibre bundles. The critical fragmentation length and the interfacial shear strength (IFSS) of the composite specimens have been determined showing a clear increase of the IFSS of up to 50% compared to specimens with applied coupling agents. Due to the high strain reduction of the PP at intensities of 15 and 33 kGy the different fibres could only be compared at 5 kGy. The ramie fibre specimens could be analyzed at 5 and 15 kGy intensity showing higher IFSS values at the higher intensity. A possible explanation for the improvement is the forming of radicals with the cellulose chains of the natural fibres and the polypropylene molecules leading to crosslinking and, therefore, better adhesion between the different components.     

An Iterative Fourier Transform Algorithm for digital hologram generation using phase-only information and its implementation in a fixed-point digital signal processor

An Iterative Fourier Transform Algorithm (IFTA) for digital hologram generation from a digital image using phase-only information is described in this paper. The algorithm is implemented in a Texas Instruments TMS320C64x fixed point digital signal processor (DSP). The holograms are reconstructed in real time using a liquid crystal display system and a He–Ne laser. The ideas described in this paper can be extended to digital hologram generation of three-dimensional objects and their reconstruction in real time using liquid crystal spatial light modulators, which could be a way for 3D-display systems.     

脉冲CO2激光诱导氨的复相催化氧化反应的研究

本文研究了TEA CO2 激光诱导的复相氨氧化反应.在1:1NH3-O2 混合气体的总压力为5Torr丶激光能量密度低于9J.cm-2 条件下, 只有在激光直接辐照于铂或镍表面上时, 才发生明显的氨氧化反应. 测定了激光频率丶能量密度和脉冲辐照次数反应的影响, 发现这类反应具有较明显的激光频率丶能量密度和脉冲辐照次数对该反应的影响, 发现这类反应具有较明显的激光光频率选择性. 同时, 还讨论了该反应的机理, 认为按 Eley-Rideal 机理解释比较合理.     

Integration in the GHP Formalism III: Finding Conformally Flat Radiation Metrics as an Example of an “Optimal Situation”

Held has proposed an integration procedure within the GHP formalism built around four real, functionally independent, zero-weighted scalars. He suggests that such a procedure would be particularly simple for the optimal situation, when the formalism directly supplies the full quota of four scalars of this type; a spacetime without any Killing vectors would be such a situation. Wils has recently obtained a conformally flat, pure radiation metric, which has been shown by Koutras to admit no Killing vectors, in general. In order to present a simple illustration of the ghp integration procedure, we obtain systematically the complete class of conformally flat, pure radiation metrics, which are not plane waves. Our result shows that the conformally flat, pure radiation metrics are a larger class than Wils has obtained.     

微波辐射一步合成对-芳基多氢喹啉衍生物

芳醛、5,5-甲基-1,3-环已二酮与乙酰乙酸乙酯或丙二酸亚异丙酯在醋酸铵存在下,用微波辐射一步合成了4-芳基-2,7,7-三甲-3-乙氧羰基-5-氧代-1,4,5,6,7,8-六氢喹啉和4-芳基-7,7-二甲基2,5-二氧代-1,2,3,4,5,6,7,8-八氢喹啉,反应在2～8min内完成,产率优良。     

Torsion Power

The demand for gravitation with torsion spans the realm from classical general relativity, where conservation of total angular momentum plus intrinsic spin requires the need for torsion, to string theory, which calls for the necessity of torsion as an antisymmetric field. Despite both the intense theoretical activity and the experimental efforts to measure torsion, research into the mechanisms of the production and radiation of torsion has been severely neglected. It is shown that torsion waves can be generated by particles with spin, and the radiated power is computed. With these results, new generations of experiments may be developed that could measure torsion waves, the effects on rotating collapsed objects, and the role of torsion waves in the development of the early universe.