日本NHK灾难传播的预防文化启示

按照日本的《灾害对策基本法》,日本NHK(Nippon Hoso Kyokai)即日本广播协会,不仅是日本全国唯一的公共广播电视台,还是指定的国家公共新闻机构。NHK不仅与日本气象厅的灾害监测网连成一体,而且还有自身独立的灾害信息采集系统,能在第一时间向世界公众播报各种灾害信息。日本"3.11"复合巨灾中,日本应急决策管理及主要应急力量间协调有效,公众虽有"核灾"恐慌,但社会群体秩序井然,表现出特有的巨灾前"临危不乱"的综合素质,所有这些均得益于日本NHK灾难传播的科学、合理、及时,都受益于NHK长此以往的安全预防文化的媒体教育。本文特别研究了NHK灾难传播管理对中国传媒界的启示,以及深入开展我国公众安全文化教育的思路。     

原电池实验的改进

1问题的提出原电也实验是电化学教学中的重点,也是理解电化学知识的关键。学生最初接触到的原电池装置是锌片和铜片直接置于稀硫酸溶液中组装而成的(如图1),新课程标准实验教材选修4第四章第一节原电池装置改为如下图2装置,使用了盐桥(作用:一是使两个半电池溶液连成一个通路,二是使两溶液保持电中性)。但有些中学实验条件较差,可能没有盐桥,而不能演示原电池实验,影响教     

Buckling response of offshore pipelines under combined tension, bending, and external pressure

The buckle and collapse of offshore pipeline subjected to combined actions of tension, bending, and external pressure during deepwater installation has drawn a great deal of attention. Extended from the model initially proposed by Kyriakides and his co-workers, a 2D theoretical model which can successfully account for the case of simultaneous tension, bending, and external pressure is further developed. To confirm the accuracy of this theoretical method, numerical simulations are conducted using a 3D finite element model within the framework of ABAQUS. Excellent agreement between the results validates the effectiveness of this theoretical method. The model is then used to study the effects of several important factors such as load path, material properties, and diameter-to-thickness ratio, etc., on buckling behaviors of the pipes. Based upon parametric studies, a few significant conclusions are drawn, which aims to provide the design guidelines for deepwater pipeline with solid theoretical basis.     

长汀民俗舞蹈“高跷扑蝶”的传承与发展

"高跷扑蝶"是流传于长汀民间一项传统的民俗舞蹈。而今,无论在表演形式还是在艺术特征上都没有太大发展,并且受到的当代新兴文化的冲击。"高跷扑蝶"这个民俗舞蹈跟其他民俗文化一样,走向濒危。为了保护这一传统民俗舞蹈,文章将从长汀民俗舞蹈"高跷扑蝶"的历史由来、该民俗舞蹈的传承现状、发展的办法与措施的问题进行阐述。     

对吹枪运动比赛成绩决定因素的研究

应用文献资料法、专家访谈法、问卷调查法、数理统计法、逻辑分析法等研究方法,对吹枪运动比赛成绩决定因素进行分析研究。结论:吹枪运动属于技能主导类表现准确性项群项目;给出了吹枪运动比赛成绩决定因素的一级指标决定程度的顺序以及二级指标决定程度的顺序。     

教辅期刊如何引领初中生阅读

初中生正处于阅读的黄金期,但其阅读的取向和质量都存在着一些问题。学生阅读能力的提高仅靠课堂学习是达不到的,需要在课外进行大量的阅读实践。这种课外阅读实践的引领者,除了教师,便是教辅期刊编辑。教辅期刊编辑应该树立正确的关于阅读的编辑理念,并密切关注课改进程、做阅读的示范者和指导者、为初中生制定科学的阅读计划、为初中生提供鲜活的阅读资源,以引导初中生进行科学、合理的阅读。     

师范大学体制改革与教师教育的政策创新

师范大学的百年发展见证了中国教师教育政策的历史变迁。师范大学在从一元封闭走向多元开放的过程中,学科专业的综合化与教师教育的专业化成为教师教育内部体制改革的重要推动力量。实施教师教育特色工程,"做优做强"教师教育,需要以促进教师专业发展为目标,构筑符合教师专业发展要求的教师教育政策新体系,努力为基础教育培养优质师资。     

Preparation of carbon encapsulated iron nanoparticles with very thin shells by DC arc discharge

Carbon encapsulated iron nanoparticles(CEINPs) with very thin shells and good core-shell structures were prepared by DC arc discharge at argon intake temperature(AIT) of 800 ℃. The results of high resolution transmission electron microscope(HRTEM), energy dispersive X-ray(EDX) spectroscope, X-ray diffraction(XRD), and X-ray photoelectron spectroscope(XPS) characterizations on the product B show that the thickness of the carbon shells of CEINPs in the product B is in the range of ca. 0.5—5.3 nm, i. e., which can be as thin as only two layers of graphite. The average diameter of the CEINPs is about 24. 7 nm. The total content of Fe element in the product B is 77.0 wt%. The saturation magnetization(Ms) and coercivity(Hc) of the product B are 107.4 emu/g and 143 Oe, respectively. The formation of the CEINPs in the product B is discussed briefly.     

Effect of Mn and Ni on microstructure and impact toughness of submerged arc weld metals

The influences of Mn and Ni contents on the impact toughness and microstructure in the weld metals of high strength low alloy steels were studied. The objective of this study was to determine the optimum composition ranges of Mn and Ni to develop welding consumables with better resistance to cold cracking. The results indicated that Mn and Ni had considerable effect on the microstructure of weld metal, and both Mn and Ni promoted acicular ferrite at the expense of proeutectoid ferrite and ferrite side plates. Varying Ni content influenced the Charpy impact energy, the extent of which depended on Mn content. Based on the properties and impact resistance, the optimum levels of Mn and Ni were suggested to be 0.6%—0.9%,, and 2.5%—3.5%, respectively. Additions beyond this limit promoted the formation of segregation structures and other microstructural features, which may be detrimental to weld metal toughness.     

网真课堂交互技术研究

网真课堂可以为网络上的异地师生实时呈现出本地课堂与远程课堂融合的情景,进行即时提问和解答等实时交互的教学活动。为了充分发挥网真课堂的优势,更好地服务于教学,提高网络教学质量,在面向网真课堂平台实际应用的设计和开发过程中,结合网络教学中各种情况的需要,增加应用视频合成、虚拟现实、体感交互、智能Agent等技术,总结提出了八大类网真课堂交互技术,兼顾了特殊情况的应用,有利于促进网络教学的反思和改进。