Press Credentials and Hybrid Boundary Zones: The Case of WorldNetDaily and the Standing Committee of Correspondents     

Jordan M. Foley 《Journalism Practice》2020,14(8):933-953

ABSTRACT

Press credentialing practices are a vital, yet understudied site of scholarly research on journalistic norms and practices. Press credentialing not only structures internal professional hierarchies, but they also signify the boundaries of the journalistic field itself. This paper explores the legal and theoretical implications of press credentialing to cover the United States Congress, drawing on the concepts of boundary work and journalistic authority to demonstrate the material impact of the space between fields on professional legitimation in journalism. Using WorldNetDaily (WND) as a case study, I argue that the Standing Committee of Correspondents (SCC) occupies a hybrid boundary zone between the journalistic and political fields, generating a unique tension in First Amendment jurisprudence that places journalists in a paradoxical role as both the professional embodiments of free speech and its constitutional steward. The resulting jurisdictional conflict between the SCC and WND extends the relational model of journalistic authority by articulating how journalist-state relations can fundamentally augment the process of legitimation at its fuzzy boundaries. The relevance and implications for press credentialing practices in the digital age are discussed.  相似文献   

基于负样本多通道优化SSD网络的钢铁厂提取     

卢凯旋  李国清  陈正超  昝露洋  李柏鹏  高建威 《中国科学院大学学报》2020,37(3):352-359

准确提取钢铁厂对去产能监测和环境保护具有重要意义。传统的人工目视解译方法效率低、成本高，无法满足开展大区域钢铁厂监测的需求。以深度学习目标检测网络SSD为基础，构建面向遥感影像钢铁厂提取的深度学习目标检测网络，提出maxout模块，将负样本通路优化为多分支结构，突出难分负样本特征并提升网络对无用特征的抵制效果。利用国产GF-1数据对京津冀地区的钢铁厂进行快速自动提取实验。与人工解译的钢铁厂点位数据的对比表明，该目标检测方法的提取精度达到80%以上。  相似文献   

传导系统中TE/TM偏振模态的辨析     

董国艳  史祎诗  王雅丽 《中国科学院大学学报》2016,33(3):347-353

电磁波/光传输特性研究中常用TE/TM偏振描述波的传播模式.不同系统中对TE/TM偏振的定义却存在差别,有时还与s/p态混合使用,使研究者在理论和实验研究中产生概念混淆和结果矛盾的问题.本文从电磁理论出发,对传导系统中可能存在的偏振模式进行深入的推导和分析,解释TE/TM偏振态存在原因和可能状态,对其与s/p态的区别进行比较说明.针对空间偏振态的易混淆问题进行逐一解答.  相似文献   

Mapping migrant vernacular discourses: Mestiza consciousness,nomad thought,and Latina/o/x migrant movement politics in the United States     

Michael Lechuga 《Journal of International and Intercultural Communication》2020,13(3):257-273

ABSTRACT

This essay reads the Latina/o/x migrant vernacular discourses that emerge out of pro-migrant activism. Anzaldúa’s notion of mestizaje – a logic of border consciousness – is put into conversation with Deleuze’s notion of nomad thought – a logic of movement – to inform a rhetorical strategy for reading the vernacular archive of social movement discourse. The “No Papers, No Fear” is one such social movement that demonstrate the logic of mestizaje/nomadism in their communication strategies. This study illuminates three tensions that define the ways Latina/o/x migrants in the US navigate the spaces of citizenship: tensions between movement/stasis, migrant identity/national identity, and fear/safety.  相似文献   

How can children with mild literacy difficulties be supported at the transition to secondary school? A small‐scale quasi‐experimental study     

Caroline Bark  Greg Brooks 《British Journal of Special Education》2016,43(4):373-393

There is evidence that pupils with weak literacy skills struggle on transition to secondary school. Many experience a drop in attainment in the summer break between the two. A British government‐funded programme of rigorously designed research on boosting literacy at transition had (by 2015) found only four of 15 interventions evaluated had positive effects. This small‐scale quasi‐experimental study investigated the effectiveness of support for pupils with mild literacy difficulties on transition to secondary school. Thirty‐two pupils in three schools were involved; half received the programme. Pairs were matched on reading, spelling, age and gender. Intervention was designed around the individual needs of each pupil, focusing variously on language skills, writing, reading and spelling. The group receiving the programme made modest gains in spelling, reading efficiency and single word reading. The comparison group lost ground, relatively, in all three areas. The results suggest a promising line for more rigorous investigation.  相似文献   

Children's responses to the interactivity of storybook apps in family shared reading events involving the iPad          下载免费PDF全文

《Literacy》2017,51(1):44-52

This paper reports on some data on the effects of screen‐based interactivity on children's engagement with storybook apps during family shared book reading that were gathered in a 2‐year, small‐scale ethnographic case study in Spain. Data analysis focuses on the complex interplay between the storybook app's interactive features and the children's responses to them. Our findings show that interactive elements increase the child's autonomy, as they tend to promote the importance of the reader, positioning him or her as a collaborator, storyteller, an author or an internal character in the fiction; something that can materialise in exciting narrative strategies that can trigger powerful responses to digital literary texts in emergent readers, including playing, creating new fictions or engaging emotionally with the story. Finally, we argue that the Reader Response models that have been used over recent decades to understand children's reading experiences with storybooks need to be revised to better understand their current experiences with interactive texts.  相似文献   

健身指导APP资源及使用行为的调查研究     

张晗  刘新华 《武汉体育学院学报》2017,51(10):37-42

在移动互联网飞速发展的今天，健身指导APP给人们的运动健身带来了新的指导方式。通过文献资料法收集了当前健身指导APP的资源现状，问卷调查法了解当前健身指导APP的使用现状。研究发现，当下健身指导APP存在的问题有：（1）健身指导APP各类型使用率与实际市场占有率差别较大；（2）健身指导APP付费服务存在缺口；（3）通过健身指导APP达到经常锻炼标准的比例较低。针对这些问题提出以下对策与建议：（1）着力发展资源配置型健身指导APP；（2）丰富健身指导APP付费服务，创造新型盈利点；（3）提高健身指导APP服务水平，加强内容的信息监管；（4）与其他互联网平台相互整合发展，多方位为人们提供健身指导服务。  相似文献   

大负荷游泳运动后大鼠额叶神经元凋亡和线粒体形态变化及Drp1、Mfn2表达的研究     

王璐  邓文骞 《成都体育学院学报》2016,(4):76-81

目的：：通过观察一次性大负荷游泳运动后线粒体形态结构以及线粒体融合分裂基因及蛋白表达的动态变化,探讨一次性大负荷游泳运动引起大鼠额叶神经元凋亡发生发展的可能机制。方法：72只雄性SD大鼠随机分为对照组(C组,n=18),一次性大负荷游泳运动组(E组,n=54),再根据运动后取材时间的不同将 E组分为：即刻组(E0组,n=18)；24h组(E24组,n=18)；48h组(E48组,n=18)。 C组常规饲养,E组进行一次性大负荷游泳运动,无负重游泳4小时。用透射电镜观察额叶神经元及神经元线粒体的形态结构；用TUNEL法检测细胞凋亡指数( AI)；检测线粒体融合分裂基因Drp1、Mfn2 mRNA转录及蛋白表达水平。结果：检测发现E组大鼠大脑额叶神经元发生了细胞凋亡,E组各组大鼠AI显著性高于C组(P<0.01),E组各时间点AI比较为：E24>E0> E48,各组间差异均具有显著性( P<0.05)。一次性大负荷运动后各时间点Drp1和Mfn2 mRNA转录和蛋白表达均高于C组( P<0.05),其中E24组大鼠大脑额叶Drp1和Mfn2 mRNA转录和蛋白的表达最强(P<0.01)；与E24组比较,E48组大鼠大脑额叶Drp1 mRNA转录和蛋白的表达下调显著(P<0.05),而Mfn2 mRNA转录和蛋白的表达下调不明显(P>0.05)。结论：一次性大负荷游泳运动引起大鼠额叶神经元凋亡及神经元线粒体形态结构异常,该异常在运动后48h内呈现动态性变化,机体可能通过调节线粒体融合分裂基因Drp1、Mfn2表达,影响大鼠额叶线粒体的形态结构和功能,从而调控额叶神经元凋亡的发生和发展。  相似文献   

基于SIRT1轴的线粒体增殖和自噬通路探讨有氧运动对NASH大鼠脂肪性肝炎的影响     

赵军  史长征  徐晓阳  董合玲  栗原博 《北京体育大学学报》2016,39(1):68-75

摘要：目的：旨在研究有氧运动抑制高脂饮食导致的肝脂肪变性、炎症和纤维化的效果，探讨有氧运动促进肝细胞线粒体增殖和线粒体自噬、改善脂肪肝细胞线粒体质量控制、抑制氧化应激的可能机制。方法：雄性健康SD大鼠随机分为普通安静组（ND），高脂安静组（C），高脂长期运动组（RE），分别给予普通饲料或高脂饲料，高脂组前七周给予普通饲料，后16周给予高脂饲料。RE组大鼠进行跑台运动，25 m/min, 60 min/d, 5 d/周, 23 周。结果：C组大鼠发生脂肪性肝炎和肝纤维化，NAS评分、血脂、血ALT和肝MDA较ND组显著性升高，肝SOD活性较ND组显著性下降； RE组大鼠NAS评分、血脂、ALT水平和肝MDA含量较C组显著性下降，肝SOD活性显著性升高；肝细胞线粒体增殖和自噬调控相关的转录因子SIRT1、Parkin和LC3II的表达上，RE组较C组显著性升高；RE组肝细胞COX IV表达和线粒体膜电位较C组显著性增加。结论：有氧运动抑制NAFLD大鼠肝炎和肝纤维化的发生，其机制与促进SIRT1表达，改善线粒体自噬和增殖功能，减少ROS生成、抑制氧化应激有关。  相似文献   

移动互联网时代O2O营销模式对体育市场的影响研究     

孟欣欣 《吉林体育学院学报》2016,(1):24-27

以文献资料法为主要研究方法，通过对当前基于移动互联网的O2 O营销模式的发展现状以及相关文献进行查阅分析。通过访谈法对业内的专家和从业者进行访谈，以O2 O对体育市场的影响作为研究对象，对目前线上的体育类产品的O2 O营销模式进行了总结和归纳。认为移动互联网为体育健康产业的发展创造了难得的机遇和良好的市场环境，体育类O2 O产品是体育产业与移动电商跨界结合的产物，能够为用户提供全方位个性化的体育服务，从而对移动互联网用户的工作、学习和生活方式、生活质量、消费观念、休闲娱乐以及社会交往等各方面产生深远的影响。  相似文献