1998年5-6月南海上混合层、温跃层 不同定义的比较

本文根据混合层和温跃层的两种不同定义，对1998年南海南北部和西太平洋混合层和温跃层的定点观测资料进行了计算和分析，比较了不同定义确定的混层，温跃层的共同点和差异。在此基础上，得出南海和西太平洋的障碍层厚度。     

Spatiotemporal evolution of PM2.5 concentrations in urban agglomerations of China

As the main form of new urbanization in China,urban agglomerations are an im-portant platform to support national economic growth,promote coordinated regional devel-opment,and participate in international competition and cooperation.However,they have become core areas for air pollution.This study used PM2.5 data from NASA atmospheric re-mote sensing image inversion from 2000 to 2015 and spatial analysis including a spatial Durbin model to reveal the spatio-temporal evolution characteristics and main factors con-trolling PM2.5 in China's urban agglomerations.The main conclusions are as follows:(1)From 2000 to 2015,the PM2.5 concentrations of China's urban agglomerations showed a growing trend with some volatility.In 2007,there was an inflection point.The number of low-concentration cities decreased,while the number of high-concentration cities increased.(2)The concentrations of PM2.5 in urban agglomerations were high in the west and low in the east,with the"Hu Line"as the boundary.The spatial differences were significant and in-creasing.The concentration of PM2.5 grew faster in urban agglomerations in the eastern and northeastern regions.(3)The urban agglomeration of PM2.5 had significant spatial concentra-tions.The hot spots were concentrated to the east of the Hu Line,and the number of hot-spot cities continued to rise.The cold spots were concentrated to the west of the Hu Line,and the number of cold-spot cities continued to decline.(4)There was a significant spatial spillover effect of PM2.5 pollution among cities within urban agglomerations.The main factors control-ling PM2.5 pollution in different urban agglomerations had significant differences.Industriali-zation and energy consumption had a significant positive impact on PM2.5 pollution.Foreign direct investment had a significant negative impact on PM2.5 pollution in the southeast coastal and border urban agglomerations.Population density had a significant positive impact on PM2.5 pollution in a particular region,but this had the opposite effect in neighboring areas.Urbanization rate had a negative impact on PM2.5 pollution in national-level urban agglomer-ations,but this had the opposite effect in regional and local urban agglomerations.A high degree of industrial structure had a significant negative impact on PM2.5 pollution in a region,but this had an opposite effect in neighboring regions.Technical support level had a signifi-cant impact on PM2.5 pollution,but there were lag effects and rebound effects.     

中国城市群地区PM2.5时空演变格局及其影响因素

城市群作为中国新型城镇化主体形态,是支撑全国经济增长、促进区域协调发展、参与国际分工合作的重要平台,也是空气污染的核心区域。本文选取2000-2015年NASA大气遥感影像反演PM_2.5数据,运用GIS空间分析和空间面板杜宾模型,揭示了中国城市群PM_2.5的时空演变特征与主控因素。结果显示：① 2000-2015年中国城市群PM_2.5浓度呈现波动增长趋势,2007年出现拐点,低浓度城市减少,高浓度城市增多。② 城市群PM_2.5浓度以胡焕庸线为界呈现东高西低的格局,城市群间空间差异性显著且不断扩大,东部、东北地区浓度提升更快。③ 城市群PM_2.5年均浓度空间集聚性显著,以胡焕庸线为界,热点区域集中东部,范围持续增加,冷点集中在西部,范围持续缩小。④ 城市群内各城市间PM_2.5浓度存在空间溢出效应。不同城市群影响要素差异显著,工业化和能源消耗对PM_2.5污染有正向影响;外商投资在东南沿海和边境城市群对PM_2.5污染具有负向影响;人口密度对本地区PM_2.5污染主要具有正向影响,对邻近地区则相反;城市化水平在国家级城市群对PM_2.5污染有负向影响,在区域性和地方性城市群则相反;产业结构高级度对本地区PM_2.5污染有负向影响,对邻近地区则相反;技术扶持度对PM_2.5污染的影响显著,但存在滞后性和回弹效应。     

青岛邮轮母港客运中心钢屋盖复杂空间节点的有限元分析

青岛邮轮母港客运中心钢屋盖的多根异形变截面杆件通过焊接直接汇交于节点,杆件尺寸大,构造复杂,属于复杂空间节点。以初步设计的节点为研究对象,利用ABAQUS有限元软件对典型的复杂空间节点建立了有限元模型,并进行了静力分析,研究节点在最不利荷载工况作用下的受力性能及破坏机理。结果表明:在最不利荷载工况下,虽然杆件的应力保持在屈服强度内,但节点核心的最大应力超过了屈服强度。本设计通过增加核心区板件厚度30%解决了节点核心应力过大的问题,可为工程中此类节点的设计优化提供参考。     

On the upper oceanic heat budget in the south china sea:Annual cycle

l.Intr0ducti0nInrecentyCarstheSouthChinaSea(SCS)hasbecomeoneofthemostimP0rtantregionsinthelocalair-seainteractionresearchbecauseofitssPecialgeographicPOsitionandsemi-encloseddeepbasincharacteristics.TheimP0rtanceoftheSCSisembodiedmainlyinwhichisoneofthekeyheatandmoisturesourcesofatmosphericcirculationineasternAsia.TheonsetandmaintenanceoftheSCSmonsoonarecloselyconnectedwiththelargeheattransportfromtheSCStoair(Yan,l997).Thestudyonspatial-temporalvariationofair-seaheatexchangeintheSCS…     

基于锁定效应的乡村旅游产业振兴路径

产业振兴是乡村振兴战略的核心内容,也是破题窗口,乡村旅游产业发展是践行“两山”理论、实现乡村富裕的有效实践。锁定效应是普遍存在的经济社会发展规律,为确保乡村旅游产业因地制宜、可持续发展,分析影响乡村旅游产业发展诸要素之间的关系,研究乡村旅游产业地域锁定机理,并尝试构建内部要素、外部环境综合作用的多重锁定机理框架。传统小农思想影响下,乡村的资源禀赋、运营管理、人才技术、村民参与、村集体战斗力、制度政策、市场需求等动力因素形成正反馈机制,使乡村旅游产业地域锁定效应不断强化。结合浙江磐安管头村旅游产业的认知锁定、市场锁定、旅游产品锁定、经营模式锁定特征,提出锁定市场专业化、反锁经营老龄化的服务质量提升路径,锁定产品差异化、反锁同质低质化的文化价值盘活路径,以及锁定模式统一化、反锁封闭个体化的共建共享共赢路径3条特色化路径,助力乡村旅游产业振兴和美丽乡村建设。