Martin to Brown     

Danielle K. Kilgo  Rachel R. Mourao  George Sylvie 《Journalism Practice》2019,13(4):413-430

The rise of the modern Black Lives Matter movement can be traced back to two key events, the 2012 death of Trayvon Martin and the 2014 death of Michael Brown. Research routinely showed that mainstream media’s narrative choices marginalize and delegitimize protesters and their causes, a pattern known as the protest paradigm. This study provides a longitudinal examination of how the same mainstream media system varied in their coverage of similar events and the degree to which journalists challenged the predicted paradigms conceptualized in other academic work. A content analysis of national newspaper coverage revealed that news before the judicial rulings focused on protesters’ tactics (violence versus peaceful) and changed to the realm of ideas (grievances and demands) after the assailants were considered not guilty of wrongdoing. No progression was found in legitimizing coverage of protests between the two cases.  相似文献   

Measuring Textbook Content Coverage: Efficient Content Analysis with Lesson Sampling     

Jiahui Zhang  Leland S. Cogan  William H. Schmidt 《Educational Measurement》2020,39(2):74-84

This study addresses measurement issues around a standards-based content analysis of mathematics textbooks’ coverage of standards for use in large-scale monitoring of standards implementation as proposed in a 2013 report by the National Research Council. An earlier study produced an exhaustive content analysis of textbooks using the 2012 Common Core State Standards for Mathematics. This yielded an accurate and reliable portrait of a textbook's coverage of standards. However, such an in-depth analysis is not feasible for large-scale standards-implementation monitoring in which a large number of textbooks may need to be analyzed. To provide such a portrait with sufficient accuracy while also substantially reducing the associated resources needed to produce such a portrait, a simulation study was conducted with the exhaustively coded database to compare different sampling schemes. Results indicated that sampling 1 day from each week and coding the corresponding lessons led to sufficiently accurate representations of the overall content of the textbook. The results provide empirical evidence for large-scale standards-based content analyses of mathematics textbooks for monitoring standards implementation which could be adapted for other subject areas.  相似文献   

央视奥运报道浅析     

饶军 《新闻界》2008,(5):24-26

中央电视台2008年北京奥运会电视报道中,在节目转播、策划、制作等方面实现了创新和突破,节目收看人数与收视率都创历史新高,实现了奥运传播最大化的战略目标。但前方记者的漏洞百出、解说员的失误频频,也折射出央视优秀专业人才的匮乏。  相似文献   

双向视频播出技术在远程教育教学中的应用     

赵晓元 《天津电大学报》2006,10(4):34-35,38

本文论述了双向视频播出技术在现代远程教育、教学中的应用情况，并在此基础上，对该项技术的优势与不足进行了深入分析。  相似文献   

行为导向在国际物流教学中的应用   总被引：2，自引：0，他引：2  

潘悦 《江苏经贸职业技术学院学报》2008,(3)

行为导向教学法作为一种实践性较强的教学方法,有利于培养学生的学习兴趣和解决实际问题的能力。将行为导向教学法运用到国际物流教学中,应先把教学体系设计为几个模块,然后再运用模拟教学、案例教学、项目教学和角色扮演等教学方法,增强学生实际应用能力。  相似文献   

养老社会保险制度国际比较   总被引：5，自引：1，他引：5  

刘子兰 《中国软科学》2003,(5):1-6

各国的养老社会保险制度在运行中存在诸多差异，作者选择筹资渠道、供款率、给付条件、替代率等内容进行比较。本文主张：应该加快工资制度改革，以便扩大费基，增加制度收入，进而适当调低费率；延长退休年龄；扩大养老社会保险制度的覆盖面。  相似文献   

A new solution to wireless sensor network density control problem     

SHI Jian JIA Yu-fu DONG Tian-lin LI Jiang 《重庆大学学报(英文版)》2006,5(3):143-151

1 Introduction a At present, the research work on wireless sensor networks is based on the assumption that the energy of a sensor node is provided by the battery and can not be regenerated. The lifetime of the node is limited and ephemeral. Hence research…  相似文献   

UV覆盖优化标准的初步研究     

张仙玲  裴晓芳  陶纯堪 《南京晓庄学院学报》2006,22(4):27-30

UV覆盖是光学综合孔径成像技术中一个关键环节,它决定于孔径阵列的排列情况,且影响到后续的图像恢复工作,所以,必须对UV覆盖进行优化,但优化标准目前尚未确定.本文利用统计的方法从研究图像频谱的高低频特性入手,从对不同方式下UV覆盖对后续的图像恢复造成的影响情况的分析比较,进行优化标准的初步研究与探讨.  相似文献   

解析分布式共振模式扬声器     

冀翔 《演艺科技》2020,(4):27-34,39

介绍分布式共振模式扬声器的原理及特性,基于弯曲波原理进行声波辐射的换能器技术,不同于传统的活塞式换能器设计,利用平板材料的共振获得了扩散的、非相关的辐射特性,带来宽覆盖角和较少的声干涉,使分布式共振模式扬声器成为解决公共扩声环境下语言清晰度问题的新方案;并与传统扬声器进行对比。  相似文献   

2001-2013年开都河流域上游积雪时空分布特征及其对气象因子的响应   总被引：1，自引：0，他引：1  

李斐  刘苗苗  王水献 《资源科学》2016,38(6):1160-1168

积雪融水是干旱区水资源的重要来源之一,深入地了解积雪面积变化的规律和趋势,有助于准确预测、合理规划干旱区水资源。本研究以新疆开都河流域上游为研究区,利用MOD10A2积雪数据对研究区积雪进行了分带提取,通过线性回归分析和Mann-Kendall秩次相关法对2001-2013年不同季节不同分带积雪日数、积雪面积变化进行了趋势分析和显著性检验。结合降水、气温等气象因素,分析了积雪面积对气象因素变化的响应程度。结果表明：①研究区整体积雪日数平均变化趋势并不明显,B带（海拔2000~2900m）以增加趋势为主,A带（海拔1098~2000m）、C带（海拔2900~3800m）及D带（海拔3800~4794m）以减少趋势为主;②D带积雪面积变化呈双峰曲线,其他各分带及整个区域积雪面积变化以单峰为主,最大值出现在冬季,最小值则出现在夏季;③B带秋季积雪面积显著增加（P<0.01）,其他分带积雪面积有减小趋势但并不显著,积雪分布有向B带集中的趋势;④研究区气温、降水分别在春、冬季节与积雪面积相关性显著（P<0.01）,对应的变化速率亦明显高于其他季节,这可能导致未来春季径流及春季洪水频率增加。  相似文献