地球椭球模型中太阳位置计算的改进     

李文  赵永超 《中国科学院大学学报》2019,36(3):363-375

准确高效的太阳位置计算在遥感辐射定标、太阳能获取等多个领域具有重要应用价值。针对传统太阳赤纬角算法对不同年份数据差异考虑不足的问题，采用数值拟合法提出适用于不同年份的改进公式。根据误差曲线所呈现的周期性，采用傅里叶展开法提出以4年为周期的赤纬角改进算法，并推导出地球椭球模型下的太阳高度角公式。蒙气差影响太阳位置观测与计算。针对传统蒙气差算法在低仰角下误差较大的问题，提出0°~30°仰角下蒙气差的改进公式。把改进算法与相应的传统算法进行误差对比，结果表明，改进算法在太阳赤纬角、太阳高度角、低仰角下蒙气差计算的误差均明显降低，计算过程简单高效，符合相关工程项目应用需求。  相似文献   

传统武术的信仰危机与文化重生     

方国清  杨建营 《武汉体育学院学报》2019,53(7):71-76

传统武术信仰就是中国人对传统武术技艺、文化的实践以及精神追求。运用文献资料法、逻辑分析法、历史学研究方法等对我国传统武术的信仰内容、消解过程、危机原因等进行了深入的剖析和反思。研究认为：中华武术是构成中国人身体领域中的信仰，这一信仰在近一个世纪里渐渐出现了危机，信仰的危机才是中华武术发展没落的根源。结论认为：要拯救传统武术，必先拯救传统武术的信仰，即恢复民众对传统武术的珍爱。无疑，对中华武术的文化自尊、自信是恢复信仰的思想认知前提；重新找回没落的传统武术技击之道是恢复信仰的核心任务；潜心务实、拒绝虚假繁荣，回归传统武术本然才是传统武术人文精神重生的路向。  相似文献   

“三个转型”综合改革：新时代世界一流体育大学发展的历史选择     

曹卫东 《北京体育大学学报》2019,42(1):17-22

摘要：新时代是我国发展新的历史方位，体育强国、教育强国、健康中国三大战略为世界一流体育大学提出了新的更高要求。为此，北京体育大学提出了“三个转型”综合改革，以推进世界一流体育大学建设和高水平竞技体育后备人才培养基地建设，为国家培养勇担新时代体育事业发展重任的优秀人才。为实现上述目标，应在深刻认识“三个转型”改革提出的背景基础上，深入理解“三个转型”的内涵与目标，全面推进“三个转型”综合改革，为新时代体育、教育事业贡献北京体育大学的力量。研究背景包括：1）新时代是“三个转型”的历史坐标，2）强国战略是“三个转型”的现实依据，3）创新模式是“三个转型”的客观需要；“三个转型”分别是：1）全面推进从传统经验型体育大学向现代科技型体育大学转型，2）从以夏季项目为主的体育大学向夏季冬季项目全面发展的体育大学转型，3）从本土化体育大学向国际化体育大学转型，其目的是实现两大办学目标：1）把北京体育大学建成中国高水平竞技体育后备人才培养基地，2）把北京体育大学建设成为世界一流体育大学；为了实现“三个转型”转型及其目标，必须准确把握“办大学与建基地、文化传承与科技创新、立足中国与放眼世界”三个维度及其核心关键问题。  相似文献   

传播的游戏理论视角下 新浪微博俄罗斯世界杯传播效果分析          下载免费PDF全文

陈肖鹏 《河北体育学院学报》2019,33(3):33-38

使用“传播的游戏理论”，对新浪微博俄罗斯世界杯传播效果进行分析，并对新媒体用户的需求进行探讨。研究认为，世界杯传播是一场盈余时代的足球“游戏”，满足用户对愉悦、趣味的需求和对游戏的需求是新媒体未来发展的一种趋势；新浪微博俄罗斯世界杯期间，体现主观、个性的“选择性会聚”让用户在“游戏”过程中促进了“自我”的发展；只为享受足球魅力的非功利性传播为用户提供了一个宽松的“游戏”环境；利用微博话题、短视频、直播等新媒体技术传播乐趣，用户从“游戏”中收获了愉悦。对于传播效果的研究立足受众的个性特征和主观心态，注重体现个体主观能动意识，对把握未来新媒体传播发展和趋势具有启示意义。  相似文献   

Deconstructing difference and inclusion in educational research: reflections on the international journal of qualitative studies in education special edition on difference     

M. Nickie Coomer 《International journal of qualitative studies in education》2019,32(3):341-345

Disabled and disability studies scholars and activists have challenged and are challenging the bio- and necro-politics of disability subjectivity through scholarship, art, activism, and online engagement. As this edition articulates, difference takes many forms, is intersectional, and is often characterized and codified by and through educational research. Acknowledging that difference is socially constructed poses challenges to the ablenationalism that undergirds not only complex systems of schooling, but the educational research on which these systems rest.  相似文献   

清代前期的嵩山文人群体初探     

《信阳师范学院学报(哲学社会科学版)》2019,(4):121-126

清代前期,嵩山一带出现了一个极有成就的文人群体。其成员前后相继,贯穿顺治至乾隆四世,历时一百余年,可考者达数十人。他们的创作在弘扬地域文化传统与文学精神的同时,又能跳出地域与传统的窠臼,具有一定的包容性与创新性,呈现出中原文化博大恢弘的气象。  相似文献   

登上领奖台：加拿大冬奥备战的治理经验及其启示     

任慧涛  楚金玲  易剑东 《南京体育学院学报(社会科学版)》2019,2(1):39-49

为备战2010年温哥华冬奥会，加拿大联邦政府设计了“登上领奖台”战略，委托OTP组织负责财政援助的划拨和绩效管理。OTP组织采用“决策层—执行层”的双层治理架构，以“奖牌至上”为原则，创建了由“项目文化”“以往成绩”“夺牌潜力”“领先优势的可持续性”4个一级指标的协会分层分类资助制度，邀请国家奥委会和残奥委、国家运动项目协会、体育科研院所等利益相关者组成协同治理网络。通过梳理加拿大治理经验，建议我国当前的备战2022年北京冬奥工作，应重视“一臂之距”理念，明确政府在冬奥备战中的职责；尊重专业自治准则，锻炼社会力量成为竞技体育治理主体；改进绩效管理模式，优化冬奥备战财政资金的申请和使用程序；重视科学创新，促进体育智库组织网络化。  相似文献   

石膏/蚯蚓粪肥对赤泥团聚体结构稳定性的影响     

王琼丽  叶羽真  薛生国  江钧  朱锋  田桃 《中国科学院大学学报》2019,36(4):530-536

赤泥是氧化铝工业生产过程中排放的高碱性固体废弃物，迄今尚无经济有效的处置方法。以华中地区某堆场赤泥为研究对象，通过土培实验研究改良剂（石膏、蚯蚓粪肥、石膏+蚯蚓粪肥）对赤泥团聚体稳定性的影响。结果表明：石膏的添加能显著降低赤泥pH，而蚯蚓粪肥能显著增加赤泥有机碳含量。土培60 d时，石膏添加后赤泥pH由10.54降到8.75，蚯蚓粪肥添加后赤泥有机碳含量由3.54 g·kg^-1增加至14.31 g·kg^-1。土培180 d时，石膏、蚯蚓粪肥、石膏+蚯蚓粪肥添加后赤泥水稳性团聚体含量由12.04%分别增加到23.49%、29.24%、33.94%；团聚体平均重量直径由0.15 mm分别增加到0.26、0.30、0.34 mm；可蚀性因子由0.36分别降低到0.31、0.30、0.29。石膏和蚯蚓粪肥的添加促进水稳性团聚体形成，提高赤泥团聚体稳定性。基质改良对赤泥团聚体稳定性的影响效果依次为：石膏+蚯蚓粪肥 > 蚯蚓粪肥 > 石膏。研究结果对赤泥土壤化处置和规模化消纳研究有科学参考意义。  相似文献   

Contemporary school knowledge democracy: possible meanings,promising perspectives and necessary prerequisites     

Eleni Katsarou  Konstantinos Sipitanos 《Educational Action Research》2019,27(1):108-124

ABSTRACT

The basic aim of this paper is to discuss the concept ‘Knowledge Democracy’ (KD) and what it can mean in the school context, its implications on knowledge production and dissemination and on the educational practices. We try to enrich this discussion by presenting action research projects to provide case studies of how thinking about KD can reshape educational practice. We consider that the discussion on KD has to be enriched as the concept seems very promising with good prospects towards school’s democratization. On the other hand, as it is quite new, it can encompass internal contradictions that can cause problems at the level of practice. So, we consider very important any contribution to this discussion not as another theoretical sample of the debate on the ‘politics of knowledge’, but because any improvement at the thinking of the issue can be reflected on school practices. Any challenge to traditional politics of knowledge can lead to a deeper understanding of the world of schooling and to transformations through new discourses and new approaches to teaching and learning in school.  相似文献   

Responses to oral glucose challenge differ by physical activity volume and intensity: A pilot study     

Trevor N. Simper  Cecile Morris  Anthony Lynn  Ciara O'Hagan  Karen Kilner 《运动与健康科学(英文)》2020,9(6):645-650

BackgroundOne-hour postprandial hyperglycemia is associated with increased risk of type 2 diabetes and cardiovascular disease. Physical activity (PA) has short-term beneficial effects on post-meal glucose response. This study compared the oral glucose tolerance test results of 3 groups of people with habitually different levels of PA.MethodsThirty-one adults without diabetes (age 25.9 ± 6.6 years; body mass index 23.8 ± 3.8 kg/m²; mean ± SD) were recruited and divided into 3 groups based on self-reported PA volume and intensity: low activity < 30 min/day of moderate-intensity activity (n = 11), moderately active ≥ 30 min/day of moderate-intensity PA (n = 10), and very active ≥ 60 min/day of PA at high intensity (n = 10). Participants completed an oral glucose tolerance test (50 g glucose) with capillary blood samples obtained at baseline, 15 min, 30 min, 45 min, 60 min, 90 min, and 120 min post-ingestion.ResultsThere were no significant differences between groups for age or body fat percentage or glycated hemoglobin (p > 0.05). The groups were significantly different in terms of baseline glucose level (p = 0.003) and, marginally, for gender (p = 0.053) and BMI (p = 0.050). There was a statistically significant effect of PA on the 1-h postprandial glucose results (p = 0.029), with differences between very active and low activity groups (p = 0.008) but not between the moderately active and low activity groups (p = 0.360), even when baseline glucose level and gender differences were accounted for. For incremental area under the curve there was no significant effect of activity group once gender and body fat percentage had been accounted for (p = 0.401). Those in the low activity group took 15 min longer to reach peak glucose level than those in the very active group (p = 0.012).ConclusionThe results suggest that high levels of PA have a beneficial effect on postprandial blood glucose profiles when compared to low and moderate levels of activity.  相似文献