将分段函数表示为初等函数的方法

本文给出了一种化具有多个分段点，且在各区间段上的表达式为多项式函数的分段函数为初等函数的具体方法．     

当代生活与艺术之死:第二、第三和第一世界

当今所谓的艺术,主要是受20世纪七八十年代以来发展并在全球范围内扩散的美国式“艺术”观念所支配,而再也不受德语的“艺术”或法语的“美的艺术”体系所支配。自从现代主义诞生以来,艺术的历史使命的减弱或者消失已经成为事实,但从全球范围而言,“艺术的终结”这一论断仍有些夸大其词。因为在第一世界的艺术死亡之后(这里存在更多的是文化),第二和第三世界的艺术还生长着。艺术从根本上说还不是一个媒介事件和现象,而是一个同我们每个人相关的东西——不管它是不是商品。     

情境支撑活动与“第二人生”中的学习迁移

情境迁移理论强调学习情境性对成功迁移具有不可或缺的重要意义。支撑-活动观是情境理论的代表性迁移观点,强调成功的迁移离不开能够提供有效支撑的真实情境。Second Life是建立在Web2.0平台上的三维虚拟社区,该社区为实训学习提供了良好的情境。以支撑-活动情境理论为指导,探讨Second Life(SL)如何促进实训学习的迁移。     

Layouts for ocean wave energy farms: Models,properties, and optimization

Renewable energy, such as wave energy, plays a significant role in sustainable energy development. Wave energy represents a large untapped source of energy worldwide and potentially offers a vast source of sustainable energy. We present models and a heuristic algorithm for choosing optimal locations of wave energy conversion (WEC) devices within an array, or wave farm. The location problem can have a significant impact on the total power of the farm due to the interactions among the incident ocean waves and the scattered and radiated waves produced by the WECs. Depending on the nature of the interference (constructive or destructive) among these waves, the wave energy entering multiple devices, and thus the power output of the farm, may be significantly larger or smaller than the energy that would be seen if the devices were operating in isolation. Our algorithm chooses WEC locations to maximize the performance of a wave farm as measured by a well known performance measure called the q-factor, which is the ratio of the power from an array of N WECs to the power from N WECs operating independently, under the point absorber approximation. We prove an analytical optimal solution for the 2-WEC problem and, based on the properties of the 2-WEC solution, we propose an iterative heuristic optimization algorithm for the general problem.     

普通高校“自考二学历”教育管理模式——以新疆昌吉学院为例

为了正确认识和应对新疆普通高校开展＂自考二学历＂试点工作中面临的问题,实现＂自考二学历＂教育和普通高校全日制教育之间优势互补,全面调动新疆普通高校参与的积极性,探索＂自考二学历＂教育管理新模式,为新疆普通高校培养复合型、应用型人才提供参考。     

交互视角下的二语习得研究

在过去的三十年里,交互假设已经发展成为交互模式。结合输入假设、交互假设和输出假设,讨论交互模式的理论根据,并通过示例详细阐述了交互在二语习得中的作用以及交互如何发生作用。此外,还讨论了交互作用所涉及的两个重要心理因素,归纳了交互研究的发展趋势和存在的误区。     

西柏坡精神与中国特色社会主义

"新中国从这里走来"这句话,确立了西柏坡在中国革命和社会发展中的历史地位。邓小平、江泽民、胡锦涛都与西柏坡革命圣地有着密切联系,从西柏坡向全党和全国人民发出了"牢记两个务必,建设有中国特色的社会主义"的伟大号召,宣示了西柏坡精神与建设中国特色社会主义这一当代中国社会发展的主题的紧密关系,揭示了西柏坡精神的深层精髓,提升了西柏坡精神在改革开放中建设中国特色社会主义所具有的当代价值和历史作用。胡锦涛总书记在中共十七大提出,完成党的伟大历史使命必须坚持"四个一定",是深刻而全面地体现出具有中国社会主义核心价值体系精髓的西柏坡精神,是对西柏坡精神和西柏坡革命传统的再现和丰富,从而表明在中共七届二中全会期间产生的西柏坡精神是建设中国特色社会主义的活水源头。     

论巴西在第二次世界大战期间的作用

第二次世界大战期间,巴西加入到世界反法西斯阵营,源源不断地供应盟军战略物资,派兵作战,积极配合盟军的军事行动,从政治、经济和军事各方面贡献出自己的人力、物力和财力,为世界反法西斯战争取得最终胜利铺平了道路。     

Relationship between duration of second stage of labour and postpartum anaemia

Aim

To assess the relationship between the duration of the second stage of labour and postpartum anaemia during vaginal birth.

Examining educational inequalities in two national systems: a comparison of the North African second generation in France and the Mexican second generation in the United States

This paper aims to compare the educational outcomes of children of immigrants in France and in the United States to highlight the ethnic educational inequalities in both countries. The comparison focuses on children from two groups: North Africans in France and Mexicans in the United States. By using two longitudinal datasets, the French Educational Panel Survey and Add Health, we examine aspirations, expectations, and secondary attainment in the two contexts. We explore in particular the role of parental education on attainment. Immigrant families have high educational aspirations in both contexts. North-African families express higher aspirations than native French with similar background, while there are no significant differences between second-generation Mexicans and the majority group net of parental education. Second-generation children are disadvantaged in school in both countries; they are more likely to drop out and less likely to graduate from high school, but most of the disadvantage is related to their social background. Net of social background, the Mexican second generation does not differ from the majority group while the North African second generation is more likely to get the French high school diploma than their peers of French origins, in line with their high aspirations. However, North Africans are more likely to receive the technological baccalauréat than the general baccalauréat.