High-power and high-efficiency operation of an all-solid-state, quasi-continuous-wave, titanium sapphire laser system

High-power and high-efficiency operation of an all-solid-state, quasi-continuous-wave, titanium sapphire laser is obtained with a diode-laser-pumped frequency-doubled Nd:YAG laser as the pump source. A maximum output power of 2.5 W is obtained for 16-W power of 532-nm pump light. A much higher conversion efficiency of 15.7% is obtained when at the maximum output power.     

Rh(Ⅰ),Co(Ⅰ)和Ru(Ⅱ)双齿磷氢化物的合成.结构表征和催化加氢活性

膦配位的过渡金属氢化物被看作是烯烃及其他一些不饱含有机化合物催化加氢反应及氢甲酰化反应的催化活性物种,关于它们的结构与催化活性关系的研究,有着重要的理论意义和实际意义,通常单齿膦配位表现出较高的催化活性,而不同的金属中心在催化活性和选择性上也表现出明显的差别,反映了催化功能与催化活性物种的电子结构和空间结构之间存在着依存关系.膦配体过渡金属氢化物,通常是以它们的相应卤化物经氢化锂铝或硼氢化钠或肼还原得     

Ti(O-i-Pr)4-NaNp-N2固氮体系在PtCl2(PPh3)2存在下和H2的反应

1975年Chatt等采用质子酸对稳定的钼钨分子氮络合物进行还原质子化反应,取得了生成氨的结果.我们在1979年开展了过渡金属氢化物与稳定和不稳定的分子氮络合物反应的研究,同样也取得了生成氨的结果.这个结果为在温和条件下H_2和配位氮分子氢化反应制取氨准备了实验基础.采用的稳定分子氮络合物有[Mo(N_2)_2(dppe)_2](Ⅰ),trans-[Mo(N_2)_2(PMePh_2)_4](Ⅱ);不稳定固氮体系有[Ti(O-i-Pr)_4-NaNp-N_2]     

Intracavity laser polarization spectrometer for biomolecule traces

A polarization variant of an intracavity laser spectrometer based on the competition of beams in an argon ion laser, radiating a number of narrow lines in the 275 to 529 nm spectral range, is proposed and described for the spectral analysis of liquid samples, having broad absorption bands, mainly biomolecules in solutions. By careful optimization of the operating conditions, a procedure has been established that results in a minimal measurable absorbance decreased up to 10(-5) units of optical density. The examined spectrometer provides a wide dynamic range of analysis. A determination of trace contents of amino acids in methanol were carried out.     

四乙铵离子对阴离子表面活性剂及其混合体系的表面活…

技术经纪人是以促成技术商品交易为目的的一种新型职业，它以技术商品的特殊性、技术商品管理的松散性、技术交易的复杂性、技术经纪的风险性等而存在。同时，经纪人要具备理论基础如社会分工深化理论、市场发育需求理论、信息资源优势理论等。