Making American Friends: The Effects of Musical Tastes and English Proficiency on Chinese International Students’ Social Networks in the United States

This study investigated the relationship between Chinese international students’ social networks in the United States and their musical tastes. Based on concept of homophily, this study used a self-reported Social Network Analysis (SNA) survey to examine whether sharing similar musical tastes affected Chinese international students’ relationship, their musical tastes, and music consumption. The results showed that having high musical taste similarity predicted closer relationship between respondents and their alters, and higher likelihood of new music consumption. This study also found that frequent American English-language songs listeners were more likely to have Americans in their social network than less-frequent American English-language songs listeners.     

基于多状态跳转模型的场景独立音频事件检测方法

针对不同类型事件设计多状态跳转模型,结合两种深度神经网络实现对传统音频事件检测框架的改进。实验表明,在DCASE2017任务2的开发集数据上,改进后的DNN-HMM系统相比于基线系统取得F值8.9%的相对提升和错误率19%的绝对下降;基于多状态跳转模型聚类的卷积神经网络模型（SC-CNN）,相比于基线系统取得F值18%的相对提升和错误率30%的绝对下降。     

Injectable hybrid inorganic nanoscaffold as rapid stem cell assembly template for cartilage repair

Cartilage injuries are often devastating and most cannot be cured because of the intrinsically low regenerative capacity of cartilage tissues. Although stem-cell therapy has shown enormous potential for cartilage repair, the therapeutic outcome has been restricted by low survival rates and poor chondrocyte differentiation in vivo. Here, we report an injectable hybrid inorganic (IHI) nanoscaffold that facilitates fast assembly, enhances survival and regulates chondrogenic differentiation of stem cells. IHI nanoscaffolds that strongly bind to extracellular matrix (ECM) proteins assemble stem cells through synergistic 3D cell–cell and cell–matrix interactions, creating a favorable physical microenvironment for stem-cell survival and differentiation in vitro and in vivo. Additionally, chondrogenic factors can be loaded into nanoscaffolds with a high capacity, which allows deep, homogenous drug delivery into assembled 3D stem-cell-derived tissues for effective control over the soluble microenvironment of stem cells. The developed IHI nanoscaffolds that assemble with stem cells are injectable. They also scavenge reactive oxygen species and timely biodegrade for proper integration into injured cartilage tissues. Implantation of stem-cell-assembled IHI nanoscaffolds into injured cartilage results in accelerated tissue regeneration and functional recovery. By establishing our IHI nanoscaffold-templated 3D stem-cell assembly method, we provide a promising approach to better overcoming the inhibitory microenvironment associated with cartilage injuries and to advance current stem-cell-based tissue engineering.     

非传统安全研究的语言学途径:以安全话语隐喻图景建构为例

[目的/意义]语言贯穿于非传统安全的多个方面,不仅可以成为安全化的指涉对象,还能够发挥其修辞、认知、评价与建构功能赋予存在性威胁以合法性,影响受众对国家政策的接受度。深入探究隐喻图景与反恐现实之间的关联,有助于发挥隐喻在反恐情报汇集、甄别与研判中的重要作用。[方法/过程]选取12个国家的52家主流媒体相关报道建立非传统安全话语专题语料库,使用Wmatrix语料库软件和语义网络分析技术整体呈现隐喻图景,揭示隐喻模式及其蕴涵意义。[结果/结论]恐怖主义媒介话语的隐喻图景以犯罪隐喻、战争隐喻、道德隐喻、疾病隐喻和自然隐喻为主要的隐喻类别,通过揭示恐怖主义基本特征、塑造参与者身份形象、描述两极化与妖魔化的故事情节、激活受众认知框架并做出道德评价等方式建构出一幅复杂多元的隐喻图景。隐喻通过塑造受众的认知模式间接地作用于反恐政策的制定与实施,是拓展非传统安全研究维度的可能路径。     

科学数据共享FAIR原则:背景、内容及实践

[目的/意义]FAIR原则已经成为科学数据管理的国际准则,研究该原则的理念内涵将有助于我国科学数据管理工作的布局与实践。[方法/过程]基于文献调研和网络调研,首先从时代特性角度分析了FAIR原则的产生背景;然后透过关键语词详细解析了可发现、可访问、可互操作、可重用4项子原则的具体内容;最后从学术会议、研究成果、科学计划、数据出版四个方面介绍了FAIR原则的研究与实践进展。[结果/结论]文章认为,数据资源持续积累、科学研究范式变革、数据共享全球行动为FAIR原则产生奠定了背景,4项子原则及其15条具体原则层层递进,共同描绘了FAIR体系。未来的科学数据共享系统将朝着融合化、智能化、生态化方向发展。     

环境——学生健康成长的保证

人的健康成长离不开一定的环境,人能选择和创造有利于教育的环境,避免不利于教育的环境。中国古代孟母三迁,就是为了使儿子能有一个有利于健康成长的环境。我们今天要全面提高学生素质,首先要给学生一个宽松、民主、和谐的成长环境,使学生能在良好的育人环境中身心得到健康成长,从而成为符合社会需要的合格人才。     

几位文化大家的“书窝”

我的手头珍藏着四张照片,照片上是几位文化大家的“书窝”。第一张照片是1990年在冰心先生府上拍的。1951年秋,成名于五四新文学的冰心与丈夫吴文藻先生,以赴美耶鲁大学任教需要转道香港做些准备为由,辗转回到北京。和所有爱国的知识分子一样,冰心全身心投入了新中国的建设,     

"铜片镀锌"最佳实验条件的分析和研究

电镀属于电化学部分电解的内容,通过电镀实验不但可以使学生更好地理解电解原理,而且对于激发学生学习化学的兴趣有一定的积极作用.     

巧用"缺氢指数"解有机化学问题

1 "缺氢指数"的概念 有机物的"缺氢指数"(符号为Ω表示)是以饱和链烃(CnH2n 2)为基准,当n个碳原子结合2n 2个氢原子即达到"饱和",则此有机物的"缺氢指数"等于零.其它有机物与饱和链烃相比较每少2个氢原子其"缺氢指数"增加1,以此类推.对于烃(CxHy)(相应的饱和链烃CxH2x 2)的"缺氢指数"计算公式:     

一种实用的人脸识别系统

本文构建了人脸识别软件系统的基本框架.对给定的包含人脸的输入图像,通过与已知人脸库中存储的模型进行匹配比较,确定是否是库中某一人物.如果是,则给出最佳匹配库中人物,从而实现自动人脸识别.