两种不同纳米金修饰方法制备的Au/CeO2复合物的抗氧化性能

以水热法制备的CeO₂纳米棒为载体,分别采用溶胶法和沉积法对其进行纳米金修饰,得到两种不同纳米金修饰方法制备的Au/CeO₂复合物。在MV-Fenton体系中用紫外分光光度法对两种Au/CeO₂复合物的抗氧化性能进行研究。结果表明：溶胶法制备的Au/CeO₂（S-Au/CeO₂）比沉积法制备的Au/CeO₂（D-Au/CeO₂）展现出更好的抗氧化性能。进一步研究表明：沉积法制备过程可能破坏了CeO₂的表面结构,导致其抗氧化性能降低;另外,溶胶法负载的AuNPs和CeO₂之间的电子传递也使其抗氧化性能增强。     

浅谈大学数学课堂纪律建设

搞好大学数学课堂纪律建设,充分彰显课堂教学功效,既能更好地发挥学生的个性,又有助于教师更有效地管理课堂;既能让学生上课感到轻松,又可以很好地维护教师的尊严。     

Kinematic analysis of three water polo front crawl styles

During water polo matches, players use different front crawl styles. The purpose of this study was to conduct a kinematic analysis of three water polo front crawl styles: front crawl with head under water, front crawl with head above water, and front crawl when leading the ball. Ten proficient water polo players performed 3 × 15 m sprints in each front crawl style, which were recorded three-dimensionally by two surface and four underwater cameras. The results showed no differences in performance and several kinematic characteristics among the water polo front crawl styles. However, front crawl when leading the ball showed shorter stroke length and greater stroke frequency. Front crawl with head underwater presented greater maximal finger depth and elbow angle at mid-stroke position. Front crawl with head above water and when leading the ball showed greater trunk obliquity and maximal depth of right and left foot, and shorter kick stroke frequency. The findings suggest that proficient players learn to master front crawl with head above water to achieve top velocity. Despite the common use of the front crawl with head underwater as the basis for water polo fast displacement, coaches should emphasize the use of the specific water polo styles to attain high performance.     

Popular press and forensic genetics in Portugal: expectations and disappointments regarding two cases of missing children

Two cases of missing children in Portugal (Joana and Maddie) have recently highlighted the dilemmas and contingencies associated with the technology of "genetic fingerprinting" for forensic purposes in the context of criminal investigations. The purpose of this article is to analyze the popular press's discourses and representations around forensic genetics in the context of those two highly mediatized criminal investigation cases. The symbolical construction and representation of forensic genetics by the media presents a form of public exposure to beliefs on forensic genetics' characteristics and potential. These are blended with popular cultural contexts that are constructed with reference to images of a super-science which may carry consequences in the public understanding of forensic science. The media coverage of both cases and their actual disclosure resembles the patterns ofa CSI effect, insofar as real science's capabilities and limitations are placed against fictionalized representations of forensic science.     

后经济危机时期我国经济发展方式初探——关于十八大报告中推进经济结构战略性调整的理解

十八大报告指出,推进经济结构战略性调整是我国加快转变经济发展方式的主攻方向,要把扩大内需作为战略基点,以此扩大国内市场规模。文章通过分析经济危机时期我国采取的经济政策及当前所面临的国际国内经济环境,阐释了我国经济持续发展所面临的问题,解读了我国调整经济结构、扩大内需、保障民生等政策背景,探究了相应的途径措施。     

项目驱动教学法在《灌溉排水工程学》中的应用研究

灌溉排水工程学作为农业水利工程专业的主干课程,其专业性、实践性极强,对学生的规划能力要求和动手能力要求很高。利用传统教学法不能很好地理论联系实际,因此文章在江西农业大学农业水土工程教学现状的基础上,探讨了利用项目驱动教学法在排水灌溉工程学进行教学的可能性,并提出了主要的教学设计过程,为进一步深化灌溉排水工程学这一课程教学改革提供了积极的借鉴作用。     

测角后交最佳点位是否位于已知三角形内心

分析了测角后交最佳点位的规律，并指出方面[2]结论的不足。     

The Feature in Translation Names of Tourist Attraction in Xinjiang and the Problem

If the tourism slogan is the best way to attract tourists attractions, there is no doubt the name of scenic spot have the di?rect impact on tourists. In recent years, the new scenic spot is more and mo...     

行政诉讼申诉制度研究--以美国职业篮球联赛申诉规则为参照

我国《行政诉讼法》缺乏完整有效的程序机制来规范行政案件的申诉,使得实践中出现了“无限申诉”的现象,威胁着司法的稳定、权威,浪费司法资源。体育规则与法律规范之间不可忽视的渊源关系及体育规则追求公平正义的内在价值,使其对法律规范的完善发展具有重大的推动作用。我国行政案件申诉制度可以以美国职业篮球联赛的申诉规则为参照,从申诉条件、时效、次数及成本四个方面进行完善。