Sampling Methods and Sample Populations in Quantitative Mass Communication Research Studies: A 15-Year Census of Six Journals

This study evaluated the sampling methods and sample populations used in all U.S.-based survey and experimental mass communication studies published between 2000 and 2014 in six major journals (N = 1,173). Most studies used nonprobability samples, and more than half used student samples. Experiments used more nonprobability and student samples than surveys. Funded studies used more probability and nonstudent samples than nonfunded studies. Implications of results pertaining to population validity and interpretations of findings for mass communication research are discussed.     

童书跨界营销发展现状与策略

童书跨界营销是近几年兴起的新型营销形式.本文界定童书跨界营销的定义及其对出版社的价值贡献,分析童书跨界营销的发展现状,探讨童书跨界营销中存在的问题,最后提出童书跨界营销的策略建议.     

出版业应用人工智能的机遇与挑战

探讨人工智能应用给出版业带来的发展机遇,包括促进出版大数据向大机遇的转化、提高出版生产效率、促进图书发现.梳理出版业应用人工智能面临的挑战,包括读者数据的获取难题、出版规律性的发现和分析难题,以及具备出版经验的智能科学家人才缺乏问题.指出要应对这些挑战,出版业在人工智能应用过程中要注意数据驱动而非代替人类决策、训练人机交互,还要提高出版人的专业素养,识别出版市场规律.     

引进“二元叙事结构”，深化展览科学内涵

在科技馆展览设计中,主题展开式、学科分类式仍然是目前比较主流和常见的设计方法。要想突破原有这些平面的设计方法,展览设计立体化是一种思路,而借助“二元叙事结构”的手法,就是实现这种立体化的一种利器。本文以合肥市科技馆“WE展区”为例,与大家分享二元叙事结构在科技馆展览设计中的做法,旨在抛砖引玉,为科技馆展览设计做一点创新尝试。     

开放获取S计划演进历程、动因及对我国的启示

[目的/意义]以利益相关者——科学共同体为视角,分析S计划的政策演变,及对我国开放获取实践发展的启示.[方法/过程]运用文献调研法与内容分析法,追踪S计划的演进历程,对标志性事件的发生时间节点、内容及相关政策进行分析;梳理S计划的最新动态,包括S计划对科学共同体影响的监控框架、权利保留政策及钻石开放获取的新模式.[结果...     

给硫酸加注几则教学参考

相信大家会有同感,讲具体物质的性质、用途时,学生没有兴趣,教师没有兴致,都觉得很枯竭,乏味。下面给硫酸加注的几则注释,相信会提高你的兴致,改变你的感受。     

元素周期表(一)

[题目]下表是元素周期表的一部分,其中所列字母分别代表某一元素。请你根据表中所给元素,回答下列问题:(1)"大爆炸理论"指出:200亿年以前,宇宙中所有物质都包含在一个密度无限大,温度无限高的原始核中,由于某种原因它发生了爆炸,首先     

Magnetically encoded 3D mesostructure with high-order shape morphing and high-frequency actuation

Inspired by origami/kirigami, three-dimensional (3D) mesostructures assembled via a mechanics-guided approach, with reversible and maneuverable shape-morphing capabilities, have attracted great interest with regard to a broad range of applications. Despite intensive studies, the development of morphable 3D mesostructures with high-order (multi-degree-of-freedom) deformation and untethered high-frequency actuation remains challenging. This work introduces a scheme for a magnetically encoded transferable 3D mesostructure, with polyethylene terephthalate (PET) film as the skeleton and discrete magnetic domains as actuation units, to address this challenge. The high-order deformation, including hierarchical, multidirectional and blending shape morphing, is realized by encoding 3D discrete magnetization profiles on the architecture through ultraviolet curing. Reconfigurable 3D mesostructures with a modest structural modulus (∼3 GPa) enable both high-frequency (∼55 Hz) and large-deformation (∼66.8%) actuation under an alternating magnetic field. Additionally, combined with the shape-retention and adhesion property of PET, these 3D mesostructures can be readily transferred and attached to many solid substrates. On this basis, diverse functional devices, including a switchable colour letter display, liquid mixer, sequential flashlight and biomimetic sliding robot, are demonstrated to offer new perspectives for robotics and microelectronics.     

专利竞争力评估系统设计与高价值专利识别

以快速、有效识别高质量专利为目标,设计一种专利竞争力评估软件系统,由数据库、指标体系、用户管理和可视化等功能模块构成,可实现千件级专利数据的快速导入、评分和可视化结果导出.利用自建航空专利数据库和外部专利数据进行实例验证,评估结果和可视化分析表明,金奖专利、高转化价值专利得分最高,专利布局更加合理.最后,结合内外部性能...     

《高等数学》题库管理系统的设计与实现

文章介绍了利用Delphi和Access数据库来实现题库管理系统的基本原理和具体方法。系统主要包含试题管理和试卷生成两部分。试题管理采用TX Text Control（ActiveX）控件实现试题在线编辑,并将试题以二进制形式存入数据库;试卷生成采用Delphi自动化服务器来实现对Word文档的编辑。