客运专线新建车站路基及排水设计与养护维修方式的探讨

本文根据秦沈客运专线新建车站排水设计在验交时存在的不同意见,从车站站型布置、路基结构、站线轨道标准、排水设计特点与既有养护维修方式等方面存在的问题进行分析、研究,探讨客运专线新建车站站型布置、路基结构,站线轨道标准、排水设计与站线养护维修方式的设计方案。     

南沙龙穴造船基地水下大砂袋封涌施工

介绍南沙龙穴造船基地深水河涌水下大砂袋封截的施工经验。     

The association of the population recruitment of gulf menhaden, Brevoortia patronus, with Mississippi River discharge

Gulf menhaden, Brevoortia patronus, which constitutes a major industrial reduction fishery in the USA, spawn across the northern Gulf of Mexico with a focus of spawning about the Mississippi Delta. This species is estuarine dependent; adults spawn over the continental shelf and their larvae are transported, by mechanisms that are presently not well understood, to estuarine nursery areas. Larval gulf menhaden, along with some other surface oriented larval fishes, appear to aggregate along the Mississippi River plume front, while evidence of the ecological consequences of this aggregation in terms of the feeding, growth, and survival of larvae is ambiguous. On an annual scale, Mississippi River discharge is negatively associated with numbers of half year old recruits. Discharge of the Mississippi River and the population recruitment of gulf menhaden may be plausibly linked through the action of the river's plume and its front on the shoreward transport of larvae. Greater river discharge results in an expansive plume that might project larvae farther offshore and prolong the shoreward transport of larvae. An indirect, decadal scale, positive response of recruitment and river discharge is possible, but not certain. Recruitment became elevated after 1975 when river discharge increased and became highly variable. This response might owe to enhanced primary and secondary production driven by nutrient influx from the Mississippi River.     

On the fresh balance of the Adriatic Sea

The long-term mean fresh water balance of the Adriatic Sea is studied by ananalysing evaporation, precipitation and river runoff. Evaporation is computed from May latent heat flux and by means of bulk formula. In the latter case two wind speed data sets are used, namely those from the NMC and May. The sea surface temperature is taken from a historical Adriatic data set, and the air temperature and relative humidity come from the NMC data set. Two precipitation data sets are considered, namely the Legates and Willmott climatology and a data set consisting of data measured at 62 rain-gauge stations located on the Adriatic coasts. Runoff contribution to the fresh water balance is estimated from the long-term average flow rates of 39 rivers and the horizontal distribution of salinity in the upper mixed layer.The spatial distribution of the fresh water balance, as well as of its components, is analysed by means of monthly objective maps, from which averages and standard deviations are computed. The results obtained from the different computations are not always univocal, particularly in the evaluation of Summer evaporation, and are affected by relatively large statistical errors. Significant spatial and seasonal variability occurs, with a noticeable fresh water gain along the coastline of the northern and middle basins, while small areas of fresh water loss are found in the middle and southern basins. Nevertheless, on an annual basis, the difference between the fresh water losses by evaporation and the gains by precipitation and runoff is clearly negative, indicating that, unlike the whole Mediterranean, the Adriatic Sea is generally a dilution basin.     

紧扣民需民意 推进三社联动 探索基层治理新模式

党的十九大对国家治理体系和治理能力现代化提出了新任务、新要求,突出社会化、法治化、智能化、专业化。以湖南省株洲市荷塘区为例,通过深入实施三社联动,不断创新基层治理,推进社会治理体系和治理能力现代化。     

江苏省沿江城市群城际轨道交通线网规划方案研究

城际轨道交通的规划建设是城市群发展的必然要求,江苏沿江城市群是我国城市化进程过程中重点发展的区域。根据沿江地区城市群的特征,把沿江地区城际轨道交通线网分为主骨架城际网和都市圈城际网两个层次进行规划,重点研究沿江地区都市圈内部中心城市之间以及中心城市与中小城市之间的城际轨道交通通勤线网。     

AMT换挡品质的研究

电控机械式自动变速器（AMT）具有传动效率高、结构紧凑及工作可靠等优点。介绍了AMT换挡品质的定义及其影响因素，分析了几种影响因素之间的内在关系，并在此理论基础上寻求一种可获得最佳AMT换挡品质的方法。AMT按照其对发动机控制方式的不同，可分为柔性控制和刚性控制结构。     

中越界河海事执法行为的风险规避

文中通过介绍中越边境河流——北仑河海事现场执法风险，分析执法风险存在的原因、表现形式，结合实际工作体会，探讨界河基层海事执法的风险防范     

半断面法超前周边注浆在煤层采空区治理中的应用

以煤层采空区治理工程为依托,详细介绍了超前周边注浆参数的选取原则,讨论了全断面注浆和半断面注浆作业的优缺点和适用范围.介绍了周边注浆施工材料、设备及施工工艺,采用分析法和检查孔法对注浆效果进行了对比分析.结果表明,采用超前周边注浆加固,能有效控制涌水量,加固松散岩体.     

潮位变化对上海某越江盾构隧道变形的影响规律研究

为了探究潮位变化与越江盾构隧道的沉降和收敛变形之间的关联性,采用数据统计分析、相关性分析和周期性分析方法,对上海某越江盾构隧道的监测数据与同时期隧道上部的潮位变化进行研究分析。研究表明:1)江中段隧道在潮位变化的作用下产生均匀沉降,其波动性与潮位起伏具有近似的周期性;2)陆域段隧道沉降变化的波动性程度与河流的距离有关;3)潮位变化引起隧道管片断面的横径和竖径产生循环的收敛变形,其横径收敛变形大于竖径收敛变形。以上研究可为越江盾构隧道设计、施工和运维提供参考。