恒温槽灵敏度实验之简易精密温度控制装置的研制

根据本科生课程化学基础实验中恒温槽灵敏度实验中的温度控制装置进行改造,开发出一种简易、耐用且精密可靠的温度控制装置,从而研制了一种适于高精度低温实验的新型低温恒温槽。经过实验可知,该恒温槽灵敏度约为±0.0065℃。     

无线网络的安全机制及其实施

无线网络技术以其便利的安装、使用,高速的接入速度,可移动的接入方式赢得众多公司、政府、个人以及电信运营商的青睐。在提供这些方便的同时,无限网络由于其自身的特点,也带来了不可避免的安全问题。本文针对无线网络面临的安全威胁,详细分析了无线网络的安全机制,并在此基础上就如何构建安全的无线网络提供了几种解决方案。     

运动人体科学实验室开放共享与创新人才的培养

高校实验室是培养创新精神与实践能力的重要基地。地方性综合院校运动人体科学实验室要想实现创新人才的培养,必须坚持实验教学资源开放共享的原则。湖南文理学院作为地方性综合院校,以培养适应地方经济社会发展需要,具有创新精神的应用型人才为目标。优化实验教学内容、建设实验教学资源共享网络管理系统、加强实验室开放项目建设以及实验室绩效考核等是实现开放共享的举措;同时建立多形式实验室开放体系、鼓励教师进行实验方法的改革、设立色lJ新实验室、改革考试方案等是实现创新人才培养的保证。     

地方师院运动人体科学实验室开放性管理的构想

运动人体科学实验室是高校众多实验室中一个具有特色的实验室。实验室的建设、发展和管理不仅要考虑实验教学和科研工作,培养综合型体育教育人才的需要,同时还要为全民健康服务,为竞技体育服务。建设特色运动人体科学实验室,加强实验室的开放性管理是学科发展以及人才培养的需要,是搭建实验教学、科研和社会服务平台的关键,从而真正体现运动人体科学实验室的价值,达到实验室仪器设备资源共享。     

复杂结构造就的自主成长:美国高等教育崛起的原因

美国高等教育在世界排名中的成功源自其独特结构.美国高等教育由多元甚至截然不同的目标、赞助人、经费来源和治理机制塑造而成,这一复杂结构正是活力与创新的源泉.首先是市场与国家之间的张力;其次是融合本科学院(平民主义的)、研究生院(精英主义的)和赠地学院(实用的)的办学模式;而在权力体制上,也存在传统权威、理性化机制和领袖魅力的整合.这一切使得美国高等教育的结构变得极其复杂,以至呈现严重的分化格局,但美国大学也因此在寻求政治与经费支持时拥有广阔空间和自主余地,并且善于适应环境,进而练就追求成功所必需的企业家式事业心与行动.     

Catalytic dechlorination and detoxification of 1-（2-chlorophenyl） ethanol by Pd/Fe

1-（2-chlorophenyl） ethanol （CPE） is of health and environmental concern due to its toxicity and its use as an intermediate in pharmaceutical manufacturing. The current work deals with the catalytic reductive dechlorination and detoxification of CPE by Pd/Fe bimetal. CPE was effectively dechlorinated to l-phenyl ethanol （PE） accompanied by the equivalent release of chloride. The extent of CPE dechlorination increased with temperature, Fe dosage and Pd loading. A decrease in solution pH increased CPE dechlorination, resulting presumably from an increase in hydrogen production. Under the specific conditions of 20 g/L Pd/Fe, 0.10% Pd （w/w） and initial pH 5-6, the CPE dechlorination was completed within 145 rain. The dechlorination followed a pseudo-first-order kinetics with an activation energy of 56.7 kJ/mol. The results of toxicity testing showed that CPE was very toxic to Chlorella, whereas PE showed little toxicity. The toxicity of the reaction solution declined gradually and the promoting effects on Chlorella intensified consequently with the dechlorination process. Thus, the reductive dechlorination of CPE to PE by Pd/Fe was a detoxification process. It may be used to effectively reduce the toxicological effects of CPE-contaminated wastewater, thereby enhancing the performance of subsequent biological processes in wastewater treatment.     

Analysis of a rainwater harvesting system for domestic water supply in Zhoushan, China

The domestic rainwater harvesting system （DRHS） is an water demands. A computer model has been generated to analyze the important freshwater source for Zhoushan, China to meet performance of the DRHS with different ratios of D/（AR） （water demand/average annual collected runoff） and S/（AR） （storage capacity/average annual collected runoff）. The performance of the DRHS was analyzed by means of the model simulation, which is described by its water shortage rate （WSR） and water loss rate （WLR）. Using the data, a set of dimensionless design calculation chart is introduced. When the water demand and requirement of the design are known, the established chart can be used to easily determine the storage capacity and catchment （roof and other surface） area required to achieve a desired performance level.     

基于K-匿名的隐私保护算法研究

随着数据共享的出现与发展,如何合理地保护隐私数据,同时又保证数据的可用性,成为当今信息安全领域面临的重大挑战．K-匿名是数据发布隐私保护的一种重要方法,它能够有效防止链接攻击所造成的隐私泄露问题．本文阐述了K-匿名模型的基本思想,给出了模型的概念描述,给出了一些典型的实现算法,并对隐私保护的未来研究方向进行了展望．     

Recurrent severe vomiting due to hyperthyroidism

Thyrotoxicosis may present in many ways; severe vomiting as a prominent symptom of thyrotoxicosis is uncommon. In this paper, we report a 24-yearoold Chinese male with hyperthyroidism who presented with recurrent severe vomiting. The patient had had intermittent vomiting for seven years and had lost approximately 15 kg of weight. Gastroscopic examinations revealed chronic gastritis and one occasion peptic ulcer. He was treated with antacid and proton pump inhibitors, but his symptoms had no relief. His presenting symptoms suggested hyperthyroidism and were confirmed by laboratory data. After a month of propylthiouracil therapy, his symptoms were relieved. It should be noted that hyperthyroidism patients can have unexplained vomiting, and that hyperthyroidism may coexist with peptic ulcer in rare cases. Awareness of such atypical presentations of hyperthyroidism may help to make a correct diagnosis.     

Effect of high glucose levels on the calcification of vascular smooth muscle cells by inducing osteoblastic differentiation and intracellular calcium deposition via BMP-2/Cbfα-1 pathway

In this paper,we investigate the effect and the possible mechanism of high glucose levels on the calcification of human aortic smooth muscle cells (HASMCs).HASMCs were divided into four groups: normal glucose group (NG),osmolality control group (OC),high glucose group (HG,HASMCs culture medium containing 30 mmol/L glucose),and high glucose plus recombinant human Noggin protein (bone morphogenetic protein-2 (BMP-2) antagonist) group (HN).The mRNA levels and the protein expressions of BMP-2 and core binding factor alpha-1 (Cbfα-1) were measured by real-time quantitative polymerase chain reaction (PCR) and Western blot.After induced by 10 mmol/L β-glycerol phosphoric acid,cells were harvested for assessments of alkaline phosphatase (ALP) activities at Days 1,2,and 3,and intracellular calcium contents at Days 7 and 14,respectively.High glucose levels increased the mRNA levels and the protein expressions of BMP-2 and Cbfα-1 (P0.05).The expression of Cbfα-1 was partially blocked by Noggin protein (P0.05),while BMP-2 was not (P0.05).After being induced by β-glycerol phosphoric acid,high glucose levels increased the ALP activity [(48.63±1.03) vs.(41.42±2.28) U/mg protein,Day 3;P0.05] and the intracellular calcium content [(2.76±0.09) vs.(1.75±0.07) μmol/mg protein,Day 14;P0.05] in a time-dependent manner when compared with the NG group,while the ALP activity could not be blocked by Noggin protein [(48.63±1.03) vs.(47.37±0.97) U/mg protein,Day 3;P0.05].These results show that high glucose levels can evoke the calcification of HASMCs by inducing osteoblastic trans-differentiation and intracellular calcium deposition via the BMP-2/Cbfα-1 pathway,which can be partially blocked by Noggin protein.