Reinforcing the Strength of Opening Computer Laboratory

建设开放实验室是高等教育发展的新要求,文章阐述了建设计算机开放实验室的条件、管理模式、运行机制以及开放的效果,论证了加强实验室的开放是民族高校培养创新人才的一条有效途径.Building opening laboratory is a new request of the development of higher education. This paper introduced the condition of building the opening laboratory of computer, the patterns of management, the mechanism of running and the effects of opening, presented to strengthen opening laboratory was an effective way of cultivating creative talents of university for nationalities

多自治域协同的数据库访问控制

多自治域的协同工作领域中,资源拥有者应该对数据库资源的操作方式及粒度有最终决定权;用户域对用户的职能作明确规定。显然角色直接映射权限的RBAC模型在多自治域协作环境中是不合理的。针对多自治域协同的数据库访问,提出基于角色的四层访问控制模型及其设计,资源域定义资源角色与权限的映射,用户域与资源域协商来映射用户角色与资源角色。该方案简单合理,分清职责,符合数据访问安全需求。国家自然科学基金(the National Natural Science Foundation of China under Grant No.60461001);广西民族大学重点科研基金项目(No.03ZSY00013

基于SOA的网格安全技术研究

随着网格技术的不断发展以及对网格研究的不断深入,对网格安全的需求不提高,面向服务的体系结构研究成果为分布式、可扩展性、可跨域管理以及软件的重用与集成提供了一个最佳的解决方案。本文将网格所涉及的安全需求做成服务的形式,设计了一个面向服务的网格安全体系结构,并以网格认证服务为实例,探讨了网格安全服务的设计与重用,它集成了多种常用的认证技术,实现网格安全服务的跨域互操作

浸泡和酸性物质促进硫熏山药脱硫的研究

目的:揭示不同方法对硫熏山药中亚硫酸盐残留量的影响,从而寻找能有效脱硫的方法。方法:利用中国药典中记录的SO2测定方法,分别采用清水浸泡和添加酸性物质的方法对硫熏山药进行处理,观测SO2含量的变化情况。结果:清水浸泡有利于硫熏山药中残留SO2的去除,并且多次换用清水浸泡效果更好,可以降低95.93%SO2残留量。在不加酸煎煮的情况下,山药中SO2残留损失很少,SO2逸出率仅为1.95%;加入盐酸能在30min内完全消除SO2残留,说明p H是影响SO2逸出的关键因素。20%冰醋酸1 h内几乎能完全消除SO2;10 m L食用白醋1 h内对SO2的消除率为87.66%,说明醋酸和食用醋的效果也较显著,但稍逊于盐酸。3个具有酸味的药材(山楂、酸枣仁和柠檬干)煎煮1 h后也可使SO2的消除率分别达到14.29%、7.79%和54.81%。结论:清水浸泡和添加酸性物质(如醋、柠檬干等)可有效脱除硫熏山药中的SO2

硫熏山药对六味地黄丸中有效成分的影响

目的:优化马钱苷、丹皮酚和毛蕊花糖苷的HPLC方法,检测山药硫熏前后的六味地黄丸中3种成分含量的差异,研究硫熏对复方的影响。方法:采用Thermo Hypersil BDS C18色谱柱（4.6 mm×250 mm,5μm）。马钱苷,流动相乙腈-0.1%磷酸梯度洗脱,检测波长236 nm;丹皮酚,流动相乙腈-0.1%磷酸（50∶50）,检测波长274 nm;毛蕊花糖苷,流动相乙腈-0.1%乙酸梯度洗脱,检测波长334 nm。柱温30℃,流速1 m L·min-1,进样量10μL。结果:随SO2量的增加,六味地黄丸中丹皮酚、马钱苷和毛蕊花糖苷均有明显的下降趋势,亚硫酸钠组的3种成分含量最低,分别为0.022 6,0.691 2,0.036 2 mg·g-1。结论:该研究优化的HPLC方法准确灵敏、重复性好,适合用于六味地黄丸的含量测定。结果证实硫熏山药对六味地黄丸会有不利影响,其根源在于SO2残留。 Objective: To optimize HPLC methods of loganin,paeonol and verbascoside,we detected the content of three components in Liuwei Dihuang Wan that prepared by sulfur-fumigated Dioscoreae Rhizoma,in order to reveal the effect of sulfur-fumigation on Traditional Chinese Medicine formulae. Method: The column was a Thermo Hypersil BDS C18( 4. 6 mm × 250 mm,5 μm). Loganin was gradiently eluted by acetonitrile-0. 1%phosphoric acid with water system as mobile phase,and 236 nm as the detection wavelength. Paeonol was isocraticly eluted by acetonitrile-0. 1% phosphoric acid with water( 50 ∶ 50),and 274 nm as the wavelength.Verbascoside was gradiently eluted by acetonitrile-0. 1% phosphoric acid with water system as mobile phase,and236 nm as the wavelength. The column temperature was 30 ℃,the flow rate was 1 m L·min-1,the injection volume was 10 μL. Result: With the increase of SO2 amount,loganin,paeonol and verbascoside derived from Liuwei Dihuang Wan were obviously decreased. In thesodium sulfite group,the content of the three components was the lowest,which to 0. 022 6,0. 691 2 and 0. 036 2 mg·g-1. Conclusion: The optimized HPLC methods had good accuracy,sensitivity and repeatability,which was suitable for determining in Liuwei Dihuang Wan. The results indicated that sulfur-fumigated Dioscoreae Rhizoma would have an adverse effect on Liuwei Dihuang Wan;the possible reason came from SO2 residue