报复性执法探析

报复性执法是指拥有行政执法权的行政主体及其工作人员在执法过程中,因为非法利益得不到满足或受到＂损害＂,滥用职权,报复性地适用法律,损害行政相对人合法权益的行为。报复性执法是选择性执法的一种。其原因主要是法律赋予行政主体的自由裁量权过大,对行政主体的监督较少,另外还有行政管理体制等方面的原因。     

云南高校开设少数民族体育公共选修课的探讨

对云南省高校开设少数民族传统体育项目公选课的意义、可行性及实施建议进行了阐述,以期促进少数民族传统体育项目得到更好的保护和推广,同时为高校体育教学改革提供一些参考.     

再论高校信息检索课程的教与学——基于信息检索为选修课程的教学研究

伴随着网络的迅速普及以及图书馆数字资源的发展,信息检索课在大学生信息素质教育中的作用越来越明显,然而基于选修课的信息检索教学存在诸多困难,文章以安徽大学为例,探讨当前环境下,信息检索课面临的困境和误区,深入剖析产生困境的原因,并探寻出解决问题的路径。     

电位法测定微量铝的研究

建立了在弱酸条件下，用氟离子选择性电极直接电位法测定微量铝的新方法，在pH=5.0时，F^-浓度大于Al^3＋浓度前提下，测定试液的电位值与之中的Al^3＋浓度成线性关系．线性范围与F^-总浓度有关，为0～10μg／ml．     

Preparation and adsorption behaviors of Cu(II) ion-imprinted polymers

Imprinted polymers were prepared for selective removal of Cu（Ⅱ） ions from metal solutions. Three ion-imprinted polymers were synthesized with methacrylic acid （MAA）, acrylamide （AA） and N,N＇-methylenebisacrylamide （MBAA） respectively as the functional monomers, ethleneglycoldimethacrylate （EGDMA） as the cross-linking agent, 2,2＇- azobisisobutyronitrile （AIBN） as the initiator and Cu （Ⅱ） ion as the imprint ion. The template Cu （Ⅱ） ion was removed from the polymer by leaching with a liquid of a 1：1 volumetric ratio of HCl to ethylenediaminetetraacetic acid （EDTA）. The capacity and selectivity of Cu（Ⅱ） ion adsorption were investigated with the three imprinted polymers and their non-imprinted counterparts. The polymers have a maximum adsorption capacity at pH 7.0. The isotherm of their batch adsorption of Cu（Ⅱ） ions shows a Langmuir adsorption pattern. Imprinted polymers all have a much higher capacity and higher selectivity of Cu（Ⅱ） adsorption than nonimprinted ones. MAA polymer benefits the most from imprinting. Imprinted MAA polymer has the highest selectivity when used to rebind Cu （Ⅱ） ion from an aqueous solution in the presence of other metal ions. Ion imprinting can be a promising technique of preparing selective adsorbents to separate and preconcentrate metal in a medium of multiple competitive metal ions through solid phase extraction （SPE）.     

素质教育:浅析非英语专业语音课开设的必要性

信息时代的飞速发展对非英语专业学生的口语提出了更高要求,而目前非英语专业学生的口语普遍存在语音不准、语调不顺的状况,严重影响了信息交互的精确度和快捷性。建议在新生入学伊始把语音课作为必修课或者选修课开设,从系统地强化学生的语音知识、不断地纠正学生的语音语调入手,从源头上改善目前非英语专业学生的语音状况,实现非英语专业大学生英语口语能力的质的提高。     

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。