Synthesis of 3-O-Benzoyl-1,2- O-isopropylidene-α-D-allofuranose and Its Dimesylated Derivative

Diisopropylidenated α-D-glucofuranose (1) was oxidated with CrO3-pyridine complex.Oxidated product and its hydrate were separated and were reduced together to synthesize diisopropylidenated α-D-allofuranose (3). The yield of 3 increased by 8% than that with only oxidated product as reduction substrate. Benzoylated derivative of 3 was selectively hydrolyzed and dimesylated to synthesize 3-O-benzoyl-1,2- O- isopropylidene-α-D-allofuranose (5) and its dimesylated deriva tive respectively. The overall yield of 5 from 1 was 36%. Each step and final products were anal yzed by 1H-NMR spectra and other methods. The experiments showed that the influence of acetic acid concentration on selective hydrolysis was obvious. The hydrolysis yield was 81.8%. Oxidation, reduction and other procedures were practical and had application potential.     

PhotoShop中蒙版、Alpha通道的概念及其应用

从理论联系实际的角度介绍图像处理软件PhotoShop中蒙版、通道和Alpha通道的概念,并且通过举例说明其具体用法.     

北京的市声——现代文人的城市体验

文学与现代城市的遭遇始于二十世纪,乡土与城市的对立成为现代文学中的一大主题。本文以现代文学中的北京“市声”为代表意象,通过文本分析,探讨现代作家在北京的种种城市体验。现代作家对市声选择性的描写,体现出他们面对城市时特有的文化心态。     

对高中体育课实行选项教学的研究

根据实践经验，对高中体育课选项教学的实践过程进行分析，总结体育课选项教学的成效，并提出改进教学的建议。     

炔烃部分氢化机理的探讨

讨论了炔烃采用选择催化加氢得到不同立体异构体顺式烯烃和反式烯烃的机理。     

Angry Anglos and aspirational Asians: everyday multiculturalism in the selective school system in Sydney

ABSTRACT

‘Asian whiz kids’ perfect test scores.’ ‘Selective schools and tiger parents.’ These types of headlines highlight the increased visibility of academically successful students from Asian migrant backgrounds, in Australia and other Western countries. They also point to anxiety about the perceived aggressive ‘tiger’ parenting often associated with Asian academic success. This paper focuses on the forms of everyday multiculturalism found in and around high-performing selective schools and classes in Sydney, Australia, almost all of which are dominated by Asian-Australian students. Drawing on interviews with parents and students from Anglo- and Asian-Australian backgrounds, it documents the different positionalities adopted by participants within these culturally diverse settings, including anger, aspiration and cosmopolitanism. This potentially volatile combination of approaches to diversity reveals some of the social consequences of neoliberal migration and education policies.     

平痛新-碘汞酸盐离子选择电极的研制与应用

报道一种以平痛新与碘汞酸盐形成的分子缔合物为电活性物的新型PVC膜平痛新离子选择电极。电极的Nernst响应范围为1.0×10-4mol/L~1.0×10-1mol/L;斜率为58mV/pC;检测限为9.0×10-5mol/L。电极响应迅速,重现性好,而且具有制作简单、使用方便的特点。已将该电极应用于盐酸平痛新药片中测定平痛新的含量,结果与紫外分光光度法相符。     

利福霉素产生菌906-43菌株的选育

用氮离子束辐照处理利福霉素产生菌地中海诺卡氏菌，再利用利福霉素浓度梯度产板培养，纯化和复筛，得到高产菌株906－43，较出发株产量提高17．5％。     

间苯氧基苯甲酸催化加氢合成间苯氧基苯甲醛

通过实验和研究用铬修饰ZrO2催化间苯氧基苯甲酸加氢制间苯氧基苯甲醛,发现Cr(Ⅲ,Ⅵ)/ZrO2催化剂可以催化间苯氧基苯甲酸加氢得到间苯氧基苯甲醛,产物可采用液相色谱法进行分析。     

学分制的发展及对我国高校教学管理的影响

学分制在世界高校中已施行100多年，我国高校全面推行学分制是近20年来实施教学管理改革的一项重要举措。伴随着我国社会主义市场经济体制的建立和完善，生产力的不断进步和科学技术的迅猛发展，高等教育必然要融入国际教育的大市场。学分制作为一种世界性的高等学校的教学管理制度，我们要根据自己的国惜有选择地吸收和借鉴世界各国的成功经验，并在积极推广发展的同时不断地改革和完善它。