锦州：松山分局干部培训工作取得成效

目前,市国土资源局征地整理中心的领导来到大苏河乡钓鱼台村,为该村送去24BA水泥以及其他建筑材料合计8400佘元,以解决该村危桥修建的燃眉之急。据悉,该村要道上的一座桥因年久失修,严重影响村民出行和车辆运输的安全。市国土资源局征地整理中心的领导得知这个消息后,第一时间赶到村里了解情况,多方听取了村民意见,     

林口县重拳打击非法采矿

本报讯 2007年林口县国土资源局与县公安局联手办案,在大盘道铁矿附近查处了一起非法盗采铁矿石案件,当场扣押运输车辆3台、大型挖掘机1台。     

梧州：加强矿产资源补偿费征收管理

梧州市国土资源管理部门加强矿产资源补偿费征收、入库和使用管理,采取了多种方式开展工作：全面调查矿山开采情况,结合矿山生产情况制定征收方案,分为花岗岩和其他矿种两大块征收补偿费。为确保花岗岩补偿费足额征收,采用在各矿山公路设站征收、凭证准运,对进出矿山的运输车辆进行过磅检查,并在各站设置监控系统,实行24小时录像监控,实行监控、核查分离,认真做好运输车辆出入站登记、录像记载和上报数的核对等方式。对其他矿种补偿费的征收,根据各矿山历年的生产情况、矿山现有的规模、     

LNG低温复合软管疲劳特性及参数化分析研究

LNG低温复合软管具有强度高、重量轻、柔韧性好等优点,可以满足恶劣海况下LNG的输送需求,但其结构复杂,且面临多种耦合载荷作用下的疲劳失效问题。首先建立了LNG低温复合软管的有限元模型,研究了复合软管在弯曲和内压载荷下的力学响应和弯曲疲劳寿命特性;然后改变螺旋钢丝直径、预紧间距、导程和纤维层数及摩擦系数等参数,对软管的弯曲疲劳寿命进行了参数化分析。结果表明预紧间距、导程和纤维层数对复合软管的疲劳损伤影响显著：预紧间距增大时,复合软管疲劳损伤先增大后减小;导程减小或者层数增加时,复合软管的疲劳损伤会明显减小;摩擦系数对疲劳损伤几乎没有影响。研究成果可为低温复合软管的结构设计提供理论参考。     

拉伸与扭转载荷作用下LNG低温复合软管的力学性能研究

LNG低温复合软管结构复杂,且在运行时受风、浪、流等多种载荷联合作用,其在超低温环境下的力学性能直接关系到其能否安全运行。首先参考江苏某软管公司生产的4英寸LNG低温复合软管,建立软管精细化有限元模型,接着对软管在拉伸、扭转两种轴对称载荷作用下的力学性能进行研究,最后就软管结构尺寸对其力学性能的影响展开分析。结果表明：在拉伸及扭转载荷作用下,不同层芳纶布以及同层芳纶布不同材料主方向在对应波峰、波谷处的受力情况不同。芳纶布铺设角度、芳纶布铺设层数、钢丝螺距以及钢丝直径对复合软管力学性能影响显著,分析相应的灵敏度规律从而对结构尺寸做出调整。研究成果可以为LNG低温复合软管的结构设计提供参考。     

Characteristics of Elemental Composition of PM2.5 in the Spring Period at Tongyu in the Semi-arid Region of Northeast China

Continuous observations of mass concentration and elemental composition of aerosol particles （PM2.5） were conducted at Tongyu, a semi-arid site in Northeast China in the spring of 2006. The average mass concentration of PM2.5 at Tongyu station was 260.9±274.4 μg m^-3 during the observation period. Nine dust events were monitored with a mean concentration of 528.0±302.7 μgm^-3. The PM2.5 level during non- dust storm （NDS） period was 111.65±63.37 μg m^-3. High mass concentration shows that fine-size particles pollution was very serious in the semi-arid area in Northeast China. The enrichment factor values for crust elements during the dust storm （DS） period are close to those in the NDS period, while the enrichment factor values for pollution elements during the NDS period are much higher than those in the DS period, showing these elements were from anthropogenic sources. The ratios of dust elements to Fe were relative constant during the DS period. The Ca/Fe ratio in dust aerosols at Tongyu is remarkably different from that observed in other source regions and downwind regions. Meteorological analysis shows that dust events at Tongyu are usually associated with dry, low pressure and high wind speed weather conditions. Air mass back-trajectory analysis identified three kinds of general pathways were associated with the aerosol particle transport to Tongyu, and the northwest direction pathway was the main transport route.     

Areas of the global major river plumes

River plumes are the regions where the most intense river-sea-land interaction occurs, and they are characterized by complex material transport and biogeochemical processes. However, due to their highly dynamic nature, global river plume areas have not yet been determined for use in synthetic studies of global oceanography. Based on global climatological monthly averaged salinity data from the NOAA World Ocean Atlas 2009 (WOA09), and monthly averaged salinity contour maps of the East and South China Seas from the Chinese Marine Atlas, we extract the monthly plume areas of major global rivers using a geographic information system (GIS) technique. Only areas with salinities that are three salinity units lower than the average salinity in each ocean are counted. This conservative estimate shows that the minimum and maximum monthly values of the total plume area of the world’s 19 largest rivers are 1.72 × 10 6 km 2 in May and 5.38 × 10 6 km 2 in August. The annual mean area of these river plumes (3.72 × 10 6 km 2 ) takes up approximately 14.2% of the total continental shelves area worldwide (26.15 × 10 6 km 2 ). This paper also presents river plume areas for different oceans and latitude zones, and analyzes seasonal variations of the plume areas and their relationships with river discharge. These statistics describing the major global river plume areas can now provide the basic data for the various flux calculations in the marginal seas, and therefore will be of useful for many oceanographic studies.     

既要港口发展 又要碧海蓝天

<正>这次调整不是简单的"平面移动",调整之后,港口周边环境进一步改善。在搬迁中,可以腾出东区煤堆场等139.78公顷港口用地以及2000米海岸线,作为城市规划建设项目用地,将堆场变成金色的沙滩,为日照市打造海上靓丽风景线创造良好条件。相信有不少人了解日照,是先从日照港开始的。日照"因海因港而     

多发点地震紧急运输优化系统的设计

大地震后的救灾运输不仅要求及时,还要保证运输量上充足.本文提出一种基于图层拼接的多发点(多个站点同时出发)地震紧急救灾运输系统的构建方案,既能够充分挖掘震后实际交通网络的潜力,又能够综合考虑多条线路同时发送救灾物资的并行运输问题,避免多条运输线路同时运输造成的交通拥堵,并能满足运输量的需求.     

Seismic analysis of a LNG storage tank isolated by a multiple friction pendulum system

The seismic response of an isolated vertical, cylindrical, extra-large liquefi ed natural gas (LNG) tank by a multiple friction pendulum system (MFPS) is analyzed. Most of the extra-large LNG tanks have a fundamental frequency which involves a range of resonance of most earthquake ground motions. It is an effective way to decrease the response of an isolation system used for extra-large LNG storage tanks under a strong earthquake. However, it is diff icult to implement in practice with common isolation bearings due to issues such as low temperature, soft site and other severe environment factors. The extra-large LNG tank isolated by a MFPS is presented in this study to address these problems. A MFPS is appropriate for large displacements induced by earthquakes with long predominant periods. A simplifi ed fi nite element model by Malhotra and Dunkerley is used to determine the usefulness of the isolation system. Data reported and statistically sorted include pile shear, wave height, impulsive acceleration, convective acceleration and outer tank acceleration. The results show that the isolation system has excellent adaptability for different liquid levels and is very effective in controlling the seismic response of extra-large LNG tanks.