求解非线性互补问题的两步迭代-Filter方法     

龙君  曾三云 《怀化学院学报》2015,(5)

利用牛顿迭代法作为预测步,用不动点迭代法作为修正步,结合filter技术,提出了求解非线性互补问题的两步迭代-filter算法,并证明了算法的局部三阶收敛性,最后通过数值实验表明该算法的有效性.  相似文献   

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   

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   

近年来中国的外国体育史研究前沿探析     

潘华 《成都体育学院学报》2016,(1)

运用文献资料及对比分析法等研究方法,依据近年来中国的外国体育史研究具有一定创新性的代表作,主要包含学术专著、科研课题、学位论文与期刊论文等,认真梳理出此间的重要成果. 研究表明,近年来中国的外国体育史研究水平有所提高,但也有不足之处. 研究认为,当前中国的外国体育史研究还需要在人才培养、学术交流、研究视野等方面实施改进措施.  相似文献   

不同年龄段女子足球运动员 Yo － Yo间歇恢复性测试与有氧、无氧能力的关联研究     

孙哲  陈效科  丰保成  徐萌 《成都体育学院学报》2016,(6):103-109

本研究以中国国家女子足球队 U －12、U －15、U －19集训队伍的52名运动员为实验对象，分别进行了 Yo － Yo IR1、Yo － Yo IR2、最大摄氧量、平均无氧功率测试，以分析 Yo － Yo 间歇恢复性测试与不同年龄段女子足球运动员有氧、无氧能力的关系。相关性分析表明：（1）U －12年龄组女子足球运动员 Yo － Yo IR1、Yo － Yo IR2测试与最大摄氧量测试结果之间低度相关，而与平均无氧功率结果间呈高度相关；（2）U －15年龄组运动员 Yo － Yo IR1、Yo － Yo IR2和平均无氧功率结果间中度相关，而2者和运动员的最大摄氧量没有明显的相关关系；（3）U －19年龄组运动员 Yo － Yo IR1、Yo － Yo IR2测试成绩和最大摄氧量结果间显著相关，而与平均无氧功率间关联程度很弱。结论：Yo － Yo间歇恢复性测试可较好地评价处于青春期女子足球运动员的无氧能力，以及成年女子足球运动员的有氧能力。  相似文献   

Solomon,Lord of the Rings: Fashioning the Signet of Power from Electrum to Nuḥās*     

Allegra Iafrate 《Al-Masaq: Islam & the Medieval Mediterranean》2016,28(3):221-241

  相似文献   

Exploring Verbal,Visual and Schematic Learners' Static and Dynamic Mental Images of Scientific Species and Processes in Relation to Their Spatial Ability     

Sulaiman M. Al-Balushi 《International Journal of Science Education》2013,35(3):460-489

The current study compared different learners’ static and dynamic mental images of unseen scientific species and processes in relation to their spatial ability. Learners were classified into verbal, visual and schematic. Dynamic images were classified into: appearing/disappearing, linear-movement, and rotation. Two types of scientific entities and their related processes were investigated: astronomical and microscopic. The sample included 79 female students from Grades 9 and 10. For the purpose of the study, three instruments were used. The Mental Images by Guided Imagery instrument was designed to investigate participants' visualization of static and dynamic mental images. The Water-Level Task was adopted to estimate participants' spatial ability. The Learning Styles Inventory was used to classify participants into verbal, visual and schematic learners. The research findings suggest that schematic learners outperformed verbal and visual learners in their spatial ability. They also outperformed them in their vividness of microscopic images; both micro-static and micro-dynamic images; especially in the case of appearing/disappearing images. The differences were not significant in the case of astronomical images. The results also indicate that appearing/disappearing images received the least vividness scores for all three types of learners.  相似文献