长江经济带岸线资源保护与科学利用

作为一种新兴和特殊的战略资源,岸线资源处于大河流域经济带的水陆交互带,承载临岸港口、工业、城镇和湿地等人类活动和自然生境,发挥重要的经济社会和生态环境功能。岸线资源是推动长江经济带高质量发展的重要物质基础,是长江经济带战略有效实施的关键。但是,长期以来由于缺乏对岸线资源的系统研究和高效管理,不合理的开发导致岸线的生物屏障和保育功能遭到破坏,影响到长江流域生态系统健康及沿岸社会经济可持续发展。文章阐述了岸线资源的战略地位与作用,回顾了20世纪90年代以来长江经济带岸线资源的跟踪研究工作;基于2017—2019年开展的中国科学院科技服务网络计划(STS)重点项目"长江经济带岸线资源调查与评估"成果,解析了长江经济带岸线资源保护与利用现状及存在的问题;最后,提出了推动长江经济带岸线资源科学保护与利用的对策。     

浅析女子蹼泳短距离技术蹼频与蹼幅之关系

通过对第3届全国体育大会蹼泳比赛女子50m、100m蹼泳前8名运动员比赛技术数据进行分析,对现状与理论最佳值的比较,了解当今世界女子蹼泳项目优秀运动员速度、蹼频、蹼幅的变化特征。结果表明：竞技蹼泳的速度,关键取决于蹼频与蹼幅两个因素,蹼频和蹼幅可有效评价蹼泳技术能力,并能应用到各种训练中,从而提高蹼泳成绩。     

Bowling ball dynamics revealed by miniature wireless MEMS inertial measurement unit

This paper presents a novel sensor technology to deduce the dynamics of a bowling ball. The sensor, a miniature wireless inertial measurement unit (IMU), incorporates MEMS accelerometers and angular rate gyros, a microcontroller, a low power RF transceiver, and a rechargeable battery. When embedded in a bowling ball, the IMU transmits the acceleration and angular velocity data that define the dynamics of the ball starting with the bowler’s delivery and its motion in the lane. Example results from professional bowlers illustrate how this technology can be used to assess bowler skill and ball performance. For instance, the IMU accurately measures the spin dynamics of the ball which are crucial to develop the ball “hook.” An analysis of ball dynamics in the lane is distilled to a measurable “hook potential” metric for further assessing bowler skill. Finally, the sensor presented herein is believed to be the world’s smallest, wireless IMU. This highly miniaturized and wireless design will enable parallel training systems for many sports, including basketball, baseball, crew, cricket, golf, fly fishing, soccer, softball, tennis, rowing, among others.     

图书馆核心价值浅论

核心价值研究是图书馆服务转型过程中绕不开的热点问题。文化权利,知识自由,开放、平等、包容、隐私等主流观点更多倾向价值观念而非价值本身,难以达成行业共识。文章从价值哲学视角分析图书馆价值及其主要价值关系:馆员、读者与文献信息三者之间的推广关系与阅读关系共同构成图书馆阅读推广体系。文献信息资源、读者资源和馆员队伍共同构成图书馆核心竞争力。阅读推广从“满足阅读”到“推进阅读”、从“被动服务”到“主动服务”,发挥图书馆在全民阅读中的主体地位与引领作用,成为图书馆核心价值。     

Learning in the practicum: engaging pre-service teachers in reflective practice in the online space

It is argued that online discussion is a useful tool for creating opportunities for learning in teacher education. In a project designed to improve the practicum in rural areas, researchers placed pre-service teachers (PSTs) in two different moderated online discussion forums: an unstructured personal blog space and a structured threaded discussion forum where discussion topics guided them to reflect on their practicum experiences in relation to theoretical components of their studies. Findings indicated a marked difference in the contributions made to each form of online discussion with significantly greater participation in the unstructured blog format. Using Kreber and Cranton’s hierarchy of reflection, analyses of both forums found that PSTs rarely engaged in high-level reflection. Examination of lecturer involvement in the forums suggests that their contributions did not sufficiently encourage PSTs towards optimum critical reflection. These results leave the researchers considering ways in which the practicum experience can better promote reflective practice in this crucial, component of teacher education.     

The polyadenylation code: a unified model for the regulation of mRNA alternative polyadenylation

The majority of eukaryotic genes produce multiple mRNA isoforms with distinct 3′ ends through a process called mRNA alternative polyadenylation (APA). Recent studies have demonstrated that APA is dynamically regulated during development and in response to environmental stimuli. A number of mechanisms have been described for APA regulation. In this review, we attempt to integrate all the known mechanisms into a unified model. This model not only explains most of previous results, but also provides testable predictions that will improve our understanding of the mechanistic details of APA regulation. Finally, we briefly discuss the known and putative functions of APA regulation.     

第16届、第17届世界杯足球决赛进球主要特征比较

通过对第 16届、第 17届世界杯足球决赛阶段各 64场比赛进球的主要特征进行比较 ,结果表明 :总进球数第 16届高于第17届 10个 ,且没有显著性差异。两届都是下半场进球数比上半场多。第 16届在第 76～ 90min时段进球数居两届各时段之首。第17届下半场各时段进球数相互接近 ,并居高不下。两届都是以中路进攻进球最多 ,前锋进球占居两届主要得分位置。两届都是以脚射进球为主 ,其中第 17届直接脚射和头顶球射进球优势显著。两届 85 1%以上进球都是在禁区内射进 ,在前场发动进攻进球率最高 ,79 0 %以上进球都是经 5次以下传球后射进。     

河北省农村社会保障制度基本框架及对策研究

在现代化进程中,农村社会保障始终处于整个社会保障体系的边缘,农民长期游离于社会保障网络之外.改革的实践和理论都未能突破城市和农村两个独立的圈子,这造成了农村社会保障制度建设严重滞后的状况.河北省应逐步在全省建立健全以农村最低生活保障、农村医疗保障、农村社会养老保险制度为主体,以农村五个保障服务网络为基础的农村社会保障制度.