Synthesis, Characterization and Structure of 3d Metal Nitrate Complexes with 1,8-Naphthyridine-N-Oxide

The complexes of 3d metal(Cr, Mn, Fe, Co, Ni, Cu, Zn) nitrates with 1 , 8-naphthyridine-N-oxide (NAPYO) were synthesized. The melting points and solubilities of the new complexes were determined and all the complexes were characterized by elemental analyses, IR spectra, UV spectra and molar conductance. The structures of both nickel complex and copper complex were determined by X-ray single crystal diffraction analyses.     

企业营销道德测试与评价系统研究

介绍了利用现代化管理技术，构建企业营销道德评价指标体系的方法和模式；利用计算机建立企业营销道德测试与评价系统的目标、总体结构以及开发实施方法．     

Growth of poly(methyl methacrylate) particles in three-component cationic microemulsions

Polymerization of methyl methacrylate (MMA) has been studied in ternary microemulsions which were stabilized by tetradecyltrimethylammonium bromide (TTAB) or stearyltrimethylammonium chloride (STAC). The sizes of MMA-swollen polymer particles (R_h) increased continuously during polymerization. This is in contrast to that of the styrene system, where R_h increased very rapidly to a maximum and then decreased continuously towards a constant value. The continuous growth of PMMA particles at 60°C are discussed. The stability of PMMA latexes increased with increasing the hydrophobic chain length of the cationic surfactant used. Traces of the coagulations of PMMA particles in the TTAB system can be seen from TEM. © 1995 John Wiley & Sons, Inc.     

物理学和天文学

历史上，物理学和天文学的发展是密切联系的。它们在整个现代科学的发展和技术的发达上起到了先锋的作用。物理学的基本规律和天文学提供的广亵的实验室构成了理想的科学发展的基础。20世纪的一系列科学上的重要突破正是这种优良结合的产物。今天，天文学和物理学又共同面对着更新的前测问题，并一道酝酿着新的科学上的重大进展。它们所取得的每一个进展也必然伴随着技术的创新和提高，也不断更新着人类的认识和文明。     

抗多径的线性合并SFH／MFSK系统在短波信道中的性能

在线性合并接收机的基础上，引入了抗多径干扰的措施，并分析了这类新型接收机在存在部分边带干扰的多径瑞利衰落信道中的性能，着重研究了多径加权因子对系统性能的影响．研究结果表明，最佳加权因子ω＊与多径干扰强度，分集重数，调制阶数和信道热噪声有关。对多径合适地加权可明显地改善系统的性能，在分集和编码相结合时，能使Ｐｂ下降２～３个数量级同时本文还研究了分集重数Ｌ和调制阶数Ｍ对系统性能的影响．     

ON A PROBLEM OF WHITNEY

In 1944 H.Whitney raised a problem:Let M be an open smooth n-manifold.Doesthere exist an imbedding of M into R~(2n) with no limit point set?Introducing a sort of Morsenumber for open manifolds and using Whitney trick,the author gives a direct proof ofthe affirmative answer to it.     

Study of pulse compression from 1.5 μm distributed feedback lasers by a gires-tournois interferometer

In this paper, the compression experiments of picosecond optical pulses from a gain-switched InGaAsP distributed feedback (DFB) laser at a 1.5 μm wavelength range using a Gires-Tournois (G-T) interferometer are reported. Ultrashort optical pulses with a pulsewidth of 6.6 ps, repetition rate of 2.4 GHz, and peak power in excess of 200 mW are obtained. The compression ratio is close to 5. The explanation for the experimental results is given, and the pulse's compression characteristics of a G-T inteferometer are discussed by a computer simulation analysis.     

1.3μmDFB半导体激光超短脉冲的产生及其压缩

本文首次报道１．３μｍ单模超短脉冲产生及压缩实验。通过梳状波电脉冲直接调制ＤＣＰＢＨ－ＤＦＢ半导体激光器，获得２２ｐｓ单模光滑脉冲；然后利用Ｇ－Ｔ干涉仪压缩得到近变换极限超短脉冲。脉宽为９．３ｐｓ，峰值功率超过２００ｍＷ，重复频率１ＧＨｚ，时间带宽乘积为０．３９，脉冲压缩比为２．４。最后对实验结果进行了讨论。     

Sr_3Ga_2Ge_4O_（14）晶体中Cr~（3＋）和Cr~（4＋）吸收光谱

采用提拉法生长了掺Ｃｒ的Ｓｒ３Ｇａ２Ｇｅ４Ｏ１４低温石榴石结构型单晶，测量了它的吸收光谱及其偏振特性，系统描述了该晶体在可见和近红外波段各吸收带的特征，指出Ｃｒ在此晶体晶格中主要存在两种价态Ｃｒ３＋和Ｃｒ４＋，Ｃｒ４＋在近红外的吸收将影响到Ｃｒ３＋的发光。