Banach空间中一类广义混合平衡问题系统解的存在性及算法

在实Banach空间中引入和研究了一类新的广义混合平衡问题组.首先考虑了一个辅助混合平衡问题组,通过它与广义混合平衡问题组的等价性,证明了它的解的存在性和唯一性;其次构造了广义混合平衡问题组的近似解的迭代算法.在一定的条件下,证明了由算法生成的迭代序列的强收敛性,这些结果推广并改进了近期的某些结果.     

论《潮骚》的美学特征

《潮骚》是三岛由纪夫作品系列中最具独特风格的小说,作家将希腊艺术美与日本古典艺术美相融合,形成自己独特的美学追求。小说中粗犷美丽的自然景观,淳朴和谐的民风民情,神圣纯洁的爱情,肉体与理性统一的青年男性美,以及富于青春活力的老年形象,均表现出小说独特的美学特征,同时也形成了这部小说轻松明朗的艺术格调,从而实现了三岛所追求的艺术美学理想。     

四元体系RbCl-ErCl_3-HCl(约22.6%)-H_2O(298.15K)的相平衡

用等温溶度方法测定了四元体系RbCl-ErCl3-HCl-H2O沿22.6%HCl截面,在298.15 K时的溶度数据,绘制了相应的溶度图.该四元体系由1个双饱点,2个固相区RbCl和ErCl3·6H2O组成,是一简单共饱型体系.     

彭水水电站升船机主提升系统设计浅议

升船机的设计是一项复杂的系统工程,彭水水电站升船机在设计之初,广泛吸取借鉴国内外相关行业的先进理念,同时参考国内升船机运行管理单位的相关运行、维护管理经验,全面比较,优化设计,尤其是对升船机主提升系统的设计进行了认真细致的优化,效果明显。本文主要就彭水水电站升船机主提升系统的设计思路、控制要求、保护策略等进行了分析,可为大中型升船机主提升系统的设计提供一些有益的经验和借鉴。     

Elaborating pedagogical content knowledge: what it means to know students and think about teaching

The purpose of this study was to examine how a teacher understood her students and then thought and made decisions about content, curriculum and pedagogy. Pedagogical content knowledge (PCK) and Deweyan philosophies of experience and education provided the theoretical frameworks. Data were collected through observations (N?=?38) and interviews (N?=?38) over four months and analysed using constant comparison. Findings indicated that this teacher possessed a broad repertoire of knowledge about students that she used to think and make decisions about content, curriculum and pedagogy. The connections between knowing students and thinking about teaching were more sophisticated and interconnected than is typically recognized or articulated in teacher knowledge literature. Three themes are used to explain how this teacher understood her students’ emotional and social lives in and out of her classroom, and ways it influenced her thinking and teaching. The discussion centers on the need for more comprehensive analyses of teachers’ pedagogical content knowledge.     

论Geo—slope中背水面边界条件选取问题

对西安市某均质土坝,库水位在最高水位的工况下,用有限元分析软件Geo—slope计算分析了背水面不同高度的透水边界对渗流场和背水面边坡安全系数的计算结果的影响。结果发现,背水面透水边界在合理的高度以下上升时总流量、出溢流量、出溢口处水力坡降、背水面边坡安全系数增大;背水面透水边界在合理的高度以上升高时这四个代表值减小。说明了合理的背水面透水边界为各个流场代表值和边坡安全系数的极值点。     

科技编辑平衡范畴方法

科技编辑平衡范畴方法必须遵循6条基本规则:明确对象,弄清性质,符合目的,服从整体,动态调控,保持比例.编辑应增强平衡意识,注意对平衡问题进行调控和检查.     

基于CGE模型的中国煤炭产能政策优化

本文基于CHINAGEM模型构建了中国能源经济均衡模型（CGE）,建立差异化的多情景政策分析,比较了不同煤炭产能政策及其组合对中国宏观经济和产业部门的影响。研究结果表明：①煤炭产能政策在优化煤炭生产结构的同时,会显著影响其他能源产业和与之有上下游关联的非能源产业产出,不可避免地对宏观经济造成一定的冲击。②降产量政策对煤炭产业结构调整的作用最有效,但对宏观经济的冲击也最大;税收政策对宏观经济的冲击最小,但对煤炭产业结构调整的作用最弱;去产能政策对煤炭产业结构与宏观经济的影响介于降产量政策和税收政策之间。③在实施煤炭产能政策的同时,综合利用税收优惠、产能置换、技术进步等综合政策手段有助于推进煤炭生产结构调整,减缓其对宏观经济的负面影响,最终实现煤炭行业长效发展。本文采用冲击资本投入的方式模拟产能政策的结果更合理,更符合煤炭去产能的经济学含义,该方法同样适用于钢铁、玻璃、水泥等产业去产能的研究。     

聚力探索特色小镇 开辟体产全新格局——北京大学第9届中国体育产业高峰论坛综述

摘要：习近平总书记在十九大报告中出要广泛开展全民健身活动，加快推进体育强国建设。随着“健康中国”上升为国家战略、居民消费升级需求日益加深，我国运动休闲特色小镇的发展路径显得尤为重要。在此背景下，专家学者和业界名流齐聚北京大学，集思广益、畅所欲言，为特色小镇献计献策，共商特色小镇建设合作大计。此次中国体育产业高峰论坛分论坛以“运动休闲特色小镇”为主题，对运动休闲特色小镇这个概念进行了全方位、系统性的深刻剖析，并结合运动休闲特色小镇相关成功实践经验，从前期策划、设计、投资到后期的建设、运营，再到内容为王、跨界融合、聚集建构效应，多层次、多角度阐释了运动休闲特色小镇建构的内在机理和方法，为建设运动休闲特色小镇事业，开创全新体育文化产业格局提供了切实可行的路径。     

Engaged Journalism and News Work: A Sociotechnical Analysis of Organizational Dynamics and Professional Challenges

ABSTRACT

Building upon the sociotechnical perspective presented by Lewis and Westlund (2015, “Actors, Actants, Audiences, and Activities in Cross-media News Work: A Matrix and a Research Agenda.” Digital Journalism 3 (1): 19–37. doi:10.1080/21670811.2014.927986), this study examines organizational dynamics, technological affordances and professional challenges of engaged journalism practices by analyzing how Hearken, one of the most celebrated audience engagement companies, and its tools and services are being implemented in 15 U.S. news organizations. This framework identifies Hearken and organizations like it as important “external actors” providing technological “actants” that are shaping how newsrooms report the news by providing ways for audiences to be brought into producing the news, particularly during the earlier phases of the reporting process. Based on in-depth interviews, we find that nearly every news organization in our sample reports some measure of success by using Hearken for involving audience members throughout the production of news. At the same time, we also identify how this implementation is significantly shaped by organizational imperatives and the models particular organizations create for producing audience-centric news work. Ultimately, this study presents a partial update to the decades-long literature on participatory journalism by suggesting that engaged journalism practices actually create opportunities for meaningful audience involvement.