Seeking the Route Choice of Rural Sports Development from Country Fairs

我国农村体育发展战略重点的研究目前主要是以小城镇和村落为主,两种不同的路径选择存在着各自的问题和相互间的冲突。文章从广大农村社会的实际情况出发,对农村体育发展战略重点的不同观点进行分析。研究认为:以乡村集市为落脚点发展农村体育,是当前两种不同行动取向矛盾冲突的解决策略,是新形势下农村体育研究与实践的新路径选择。依托乡村集市普遍开展农村体育文化赛事活动,是激励农民在利益驱动下参与体育最为经济有效的方法。The development strategy of rural sports focus on currently study is settlement and the small town,two different route choices have respective problem and mutually contradictory.It analyses the different views on the developing strategic focus of rural sports from actual conditions of the vast rural.The study suggests that: rural sports rely on country fairs as a foothold; it 's the solution strategy to currently conflict,and the new route choice to rural sports' research and practice in new situation.Depending on country fairs to widely carried out rural sports activities would be the most economical and effective method to encourage peasants participation in sports under the interest drive

STUDY ON ELEMENTAL CONCENTRATION IN AIR PARTICULATE MATTER BY ICP-MS

This study conducted air particulate matter sampling to measure the total suspended particulate (TSP), PM 10 (particles<10 μmm in aerodynamic diameter) and PM 2 5 (particles<2 5 μmm in aerodynamic diameter) mass concentration at Tongan district in Xiamen. One hundred and nineteen samples were obtained to measure the mass concentrations of TSP, PM 10 and PM 2 5 during 15 April to 6 June 2002. According to these results, the TSP, PM 10 and PM 2 5 mass concentrations varied from 53 μg·m -3 (from 26 to 105 μg·m -3 ), 48 μg·m -3 (from 23 to 74 μg·m -3 ) and 41 μg·m -3 (from 18 to 62 μg·m -3 ), respectively. 18 elemental concentrations were determined by ICP MS, most elemental profiles were lower than previous studies. However, high levels of Pb and Zn indicate some pollutants existed in air particulate matter.SupportedbyYouthInnovationFoundationofFujian ( 2 0 0 1J0 5 3

Appl ica tion of Ultraf iltra tion to Pur if ica tion of Cepha lospor in C

教育部重点科技项目；教育部骨干教师基金；福建省重点科技项目资助

Room-temperature quantum interference in single perovskite quantum dot junctions

钙钛矿材料由于其高量子产率、载流子迁移率和独特的光致发光特性而在光电材料领域存在诸多潜在的重要应用。研究钙钛矿材料在纳米尺度下电荷输运的独特尺寸效应对钙钛矿光电器件的设计和开发具有重要的指导意义。洪文晶教授课题组基于机械可控裂结技术自主研发了具有皮米级位移调控灵敏度和飞安级电学测量精度的精密科学仪器，对南开大学李跃龙副教授团队合成的钙钛矿量子点进行了深入表征，研究工作成功将量子干涉的研究体系拓展至在光电领域具有重要应用的钙钛矿材料领域，为未来制备基于量子干涉效应的新型钙钛矿器件提供了一种全新的思路。 这一跨学科国际合作研究工作是在化学化工学院洪文晶教授、英国Lancaster 大学物理系Colin J. Lambert教授以及南开大学电子信息与光电工程学院李跃龙副教授的共同指导下完成的。化工系硕士研究生郑海宁、Lancaster University大学Songjun Hou博士、南开大学硕士研究生辛晨光为论文第一作者。博士后林禄春，博士研究生谭志冰、郑珏婷，硕士研究生蒋枫、张珑漪，本科生何文翔、李庆民等参与了论文的研究工作。刘俊扬特任副研究员、师佳副教授和萨本栋微纳米研究院杨扬副教授也参与了部分指导工作。The studies of quantum interference effects through bulk perovskite materials at the Ångstrom scale still remain as a major challenge. Herein, we provide the observation of roomtemperature quantum interference effects in metal halide perovskite quantum dots (QDs) using the mechanically controllable break junction technique. Single-QD conductance measurements reveal that there are multiple conductance peaks for the CH3NH3PbBr3 and CH3NH3PbBr2.15Cl0.85 QDs, whose displacement distributions match the lattice constant of QDs, suggesting that the gold electrodes slide through different lattice sites of the QD via Auhalogen coupling. We also observe a distinct conductance ‘jump’ at the end of the sliding process, which is further evidence that quantum interference effects dominate charge transport in these single-QD junctions. This conductance ‘jump’ is also confirmed by our theoretical calculations utilizing density functional theory combined with quantum transport theory. Our measurements and theory create a pathway to exploit quantum interference effects in quantum-controlled perovskite materials.This work was supported by the National Key R&D Program of China (2017YFA0204902, 2014DFE60170, 2018YFB1500105), the National Natural Science Foundation of China (Nos. 21673195, 21503179, 21490573, 61674084, 61874167), the Open Fund of the Key Laboratory of Optical Information Science & Technology (Nankai University) of China, the Fundamental Research Funds for the Central Universities of China (63181321, 63191414, 96173224), and the 111 Project (B16027), the Tianjin Natural Science Foundation (17JCYBJC41400), FET Open project 767187—QuIET, the EU project BAC-TO-FUEL and the UK EPSRC projects EP/N017188/1, EP/M014452/1. 该工作得到国家重点研发计划课题（2017YFA0204902）、国家自然科学基金（21673195、21503179、21490573）、厦门大学“人工智能分析引擎”双一流重大专项等项目的资助，也得到了固体表面物理化学国家重点实验室、能源材料化学协同创新中心的支持

冲动性在药物成瘾行为形成不同阶段中的作用:成瘾的潜在行为标记物

分析了北京食品市场现状和居民食品消费的偏好和特点,走访了典型的北京本地知名食品企业,分析并其经营特点和发展现状,并结合北京地区政治、经济、环境、资源和文化等因素,提出相应的食品企业发展建议。 更多还原 &nbsp;</p

Device for autonomous detection of deep sea watertight socket connector performances

本发明涉及深海水密接插件的检测设备，具体地说是一种自主检测深海水密接插件性能的装置，包括舱体、端盖、电子架结构、水密电缆、深海水密接插件及深水压力传感器，舱体的两端分别密封连接有端盖，电子架结构容置于舱体内、并与舱体内壁抵接，电子架结构设有电池组及分别与电池组电连接的深度测试板、采集控制板、MOX模块、数据读取板；舱体两端的端盖上分别设有深海水密接插件，两端端盖上相对应的深海水密接插件之间通过水密电缆相连，在任一端的端盖上安装有深水压力传感器，深水压力传感器在舱体内部通过电线与深度测试板电连接。本发明具有结构简单、便于试验、占用空间小、依赖性小、适用范围广、操作简单等优点

Device for autonomous detection of deep sea watertight socket connector performances

本发明涉及深海水密接插件的检测设备，具体地说是一种自主检测深海水密接插件性能的装置，包括舱体、端盖、电子架结构、水密电缆、深海水密接插件及深水压力传感器，舱体的两端分别密封连接有端盖，电子架结构容置于舱体内、并与舱体内壁抵接，电子架结构设有电池组及分别与电池组电连接的深度测试板、采集控制板、MOX模块、数据读取板；舱体两端的端盖上分别设有深海水密接插件，两端端盖上相对应的深海水密接插件之间通过水密电缆相连，在任一端的端盖上安装有深水压力传感器，深水压力传感器在舱体内部通过电线与深度测试板电连接。本发明具有结构简单、便于试验、占用空间小、依赖性小、适用范围广、操作简单等优点。</p

Feasible trajectory generation for autonomous vehicles based on quartic Bzier curve

对于实际的无人车系统来说，轨迹规划需要保证其规划出来的轨迹满足运动学约束、侧滑约束以及执行机构约束。为了生成满足无人车初始状态约束、目标状态约束的局部可行轨迹,本文提出了一种基于四阶贝塞尔曲线的轨迹规划方法。在该方法中,轨迹规划问题首先被分解为轨形规划及速度规划两个子问题。为了满足运动学约束、初始状态约束、目标状态约束以及曲率连续约束,本文采用由3个参数确定的四阶贝塞尔曲线来规划轨迹形状。为了保证转向机构可行,本文进一步采用优化方法求解一组最优参数从而规划出曲率变化最小的轨线。对于轨线执行速度规划,为了满足速度连续约束、加速度连续约束、加速度有界约束以及目标状态侧滑约束，本文首先求解了可行的轨迹执行耗时区间,再进一步在该区间中求解能够保证任意轨迹点满足侧滑约束的耗时，最后再由该耗时对任意点速度进行规划。本文结合实际无人车的应用对轨迹搜索空间生成、道路行车模拟以及路径跟踪进行了仿真实验，并基于实际的环境数据进行了轨迹规划实验

Nuclear Gluon Distributiom in the Extended x-Rescaling Model

利用推广X重新标度模型，并结合考虑核内邻近核子的海夸克和胶子发生空间重叠而在小X区域引起的核遮蔽效应，计算了Sn和C核胶子分布函数之比值，所得结果与nMC组最新实验数据符合甚好。Using the extended x-rescaling model and taking account of the nuclear shadowingeFFect by the spatial overlap of sea quarks and gluons From neighbouring nucleons in thenucleus in small x region, we calculate the ratios Gsn(x)/Gc(x).The calculated results arein good agreement with recent NMC experimental data国家及河北省自然科学基金和省教委资