Determination of six components in Rhubarb by cyclodextrin-modified micellar electrokinetic chromatography using a mixed micellar system of sodium cholate and sodium taurocholate

A cyclodextrin-modified micellar electrokinetic chromatographic method was established to determine five anthraquinone derivatives and a distyrene derivative in Rhubarb. The six components were successfully separated by using the mixed micellar system consisting of 20 mmol/l SC and 20 mmol/l STC with 15 mmol/l β-CD in the BGE of 20 mmol/l borax buffer (pH 11) in less than 20 min. Effect of SC and STC concentrations, pH of BGE and concentration of β-CD on the separation was studied. The analytical performance of the method was discussed in terms of linearity response, precision, detection limits, quantitation limits and recoveries. The method developed was applied to the determination of three commercial Rhubarb samples. The results obtained agreed with those of the reported documents.     

浅析我国的人口发展过程

本文利用Ｍａｌｔｈｕｓ生物总数增长定律以及Ｖｅｒｈｕｌｓｔ生物总数增长统计筹算律［１］［２］，对我国人口的发展情况进行检验、分析和予测．     

微肥“稻多收”1995年滁州市应用试验报告

示范了１３３３０×６６７ｍ２施用微肥“稻多收”增产效果，平均每６６７ｍ２增产稻谷７０ｋｇ，共增产稻谷９３３０００ｋｇ，扣除每６６７ｍ２农业成本１２元．净增效益２１１．６８万元．还取得了科教工作者直接投身于经济建设的几点经验体会。     

A New Method to Analyse Two-Side Tapered Waveguides

We discuss the characters of two-side tapered waveguides. Then, based on some approximations, a simple but practical and efficient method is developed to design the taper waveguide. The results are compared with other methods in a good agreement.     

Laser spectroscopy of nuclear reaction products: recent results and future prospects

Laser spectroscopic observations of nuclear reaction products produced with intensities of less than 10⁴ atoms/second are now possible with several different methods. We describe the recoil into gas method which has recently been successful. This method is not Dopplerfree, but can give reasonable spectra if the resolution requirements of the spectra are not too high. It has the great advantage that it very efficiently uses the atoms, and spectra have been observed with primary production rates of less than 10³ atoms/sec. Our recent work has concentrated on developing the recoil into gas method for the refractory element Hf. In order that the atoms could be cycled to produce many fluorescence photons, nitrogen and hydrogen impurity gases were added to the argon buffer gas to quench metastable levels to the ground state. In this way spectra could be obtained with fluxes of 10⁴ atoms/second. Future prospects for trapping radioactive atoms in a magneto-optic trap will be discussed.     

[Fe_3O(Ala)_6(H_2O)_3](ClO_4)_7和[Fe_3O(Gly)_6(H_2O)_3](NO_3)7·3H_2O的顺磁共振谱及变温磁化率研究

本文通过对 [Fe3 O(Ala) 6(H2 O) 3 ](Cl O4) 7和 [Fe3 O(Gly) 6(H2 O) 3 ](NO3 ) 7· 3H2 O的 ESR谱的解析及变温磁化率的研究 ,得出它们的 ESR谱具有各向同性的特点 ;朗德因子分别为 2 .0 19和 1.997;两种配合物中铁离子间有反铁磁相互作用     

Two New Acyclic Diterpene—γ—lactones from the Leaves of Salix matsudana

Two new acyclic diterpene-γ-lactones named hanliuine(Ⅲ） (1) and hanliunine IV(2) were isolated from leaves of Salix matsudana (Chinese name “hanliu”). Their structures were deduced from spectral data.     

强正则图与Seidel变换

本文通过对图的Seidel变换进一步研究，得到了一些新的强正则图。     

冲击压缩下玻璃样品后自由表面速度的过冲现象

实验发现当飞片碰撞玻璃样品产生的冲击载荷超过一定值后 ,玻璃样品后自由表面速度时程曲线上有过冲现象 ,即速度上升到最大值后 ,立即开始下降 ,其时间的开始部分类似于三角波。通过高速摄影和VISAR等测试手段对这一现象进行了较系统的研究 ,发现其与玻璃样品后自由表面附近的破碎有关 ,建立了描述这一破坏现象的损伤演化方程 ,并进行了数值模拟。计算结果和实验结果吻合 ,表明对这个现象的解释是合理的。