世界体育发达国家体育俱乐部发展经验及启示

采用文献资料法、专家访谈法等研究近年来世界体育发达国家体育俱乐部发展情况。世界体育发达国家体育俱乐部发展经验主要有:政府大力扶持俱乐部发展,采取多元化融资模式,建立健全俱乐部标准化认证体系,加强跨行业协作,发挥体育志愿者和社会体育指导员的积极作用,利用俱乐部促进大众体育和竞技体育的融合发展。对我国的启示:做好顶层设计进一步激发发展活力,促进融资渠道多元化,加大对社会体育指导员的激励,切实提升智能化运营水平以及提高学校体育设施利用率。

Distribution of primary school based on spatial network comprehensive model in low-income mountainous cities： a case study in Wanyuan, China

Focusing on the peculiarities of urban construction resulting from specific mountain terrains, the purpose of this study is to find out a suitable method based on a Spatial Network Comprehensive Model(SNCM) to reasonably plan and distribute primary schools in low-income mountain cities. The construction principles and advantages of the SNCM method are proposed and the method tested in Wanyuan city of Qinba Mountain area(Southwest China) to verify its feasibility and optimization. Taking account of the mountain terrain and its influence on user behavior, we used the SNCM method to build a comprehensive model which integrates the road slope and the walking speed of pupils into the basic spatial model. The model is used to calculate a reasonable layout of the primary schools and to validate the rationale. The results show that the SNCM method can be effectively applied in low-income mountainous cities. It can not only improve the accessibility and service efficiency of primary schools using as little capital-investment as possible, but also help the city grow in an intensive and efficient way.

顶空气相色谱法测定睾酮中的残留溶剂

目的建立测定睾酮中甲醇、乙醇、甲酸乙酯、乙酸乙酯、吡啶残留量的方法。方法采用顶空气相色谱法,火焰离子化检测器(FID)。色谱柱为Agilent DB-624(30 m×0.32 mm,1.8μm)毛细管色谱柱,程序升温,载气为氮气,进样口温度为220℃,检测器温度为250℃。结果5种残留溶剂在各自的浓度范围内线性关系良好(r=0.9967~0.9992)。平均回收率为96.4%~103.6%,RSD为1.57%~2.70%。结论该分析方法操作简便、灵敏度高、重复性好、适用性强,结果准确,适用于睾酮中残留溶剂的分析检测。

船舶直流电网固态母联开关优化设计与性能分析

针对传统直流断路器用做船舶直流微电网母联开关存在体积大、成本高的问题,根据船舶直流电网电力推进系统的小体积、高可靠性,以及灵活布局等需求,设计一类适应船舶和相似直流微电网的固态母联开关,减少器件数量、成本和体积,通过搭建电力推进系统精细化仿真模型,分析优化拓扑电路故障关断瞬态的电气特征,验证设计的可行性,仿真结果表明,设计的母联开关拓扑相比传统断路器具有良好的关断续流和吸收功能,关断震荡时间约5 ms、过电压约1300 V。