《国家公路网规划(2013年-2030年)》出炉     

樱子 《中国勘察设计》2013,(7):26

到2030年,建成公路网总规模约580万公里、国家公路网约40万公里,总投资约4.7万亿元本刊讯近日,交通运输部公布了《国家公路网规划(2013年-2030年)》(以下简称《规划》)。《规划》显示,到2030年,我国将大约投入4.7万亿元,建成公路网总规模约580万公里、国家公路网约  相似文献   

Scale and scope of maritime cargoes through the Arctic Passages     

ZHANG Xia  SHOU Jianmin  ZHOU Haojie 《极地研究(英文版)》2013,(3):158-166

This paper investigates the sources of goods being shipped through the Arctic passages, and trade generated in the Arc- tic, including oil and gas exploitation. Furthermore, it assesses the present situation for maritime cargo shipped from the Far East to Northwestern Europe and North America. Two main types of cargo are predicted to pass through the Arctic passages in the future. First, about 10 million t of liquefied natural gas will be delivered from Russia and the Nordic Arctic to the Far East by 2030. Second, there will be two-way trade flow of containerized cargo from the Far East to Europe and the United States through the North- east, Central and Northwest Passages. This will relieve pressure on present routes from the Far East to Northwestern Europe and North America. If Arctic navigation is technically possible in all seasons and shipping costs fall to those of ordinary ships, then assuming an equal share of shipping volume with the traditional canal routes, the maximum container freight passing through the Arctic passages by 2030 will be approximately 17.43 million TEUs （Twenty-foot Equivalent Units） per year, which is 85% of the volume transported on traditional canal routes in 2011. We conclude that there will be large-scale gas transportation through the Northeast Passage in the near future, and transit shipping across the Arctic will focus more on container transportation. The differences in shipping costs between Arctic routes and traditional canal routes are also compared.  相似文献   

舟山港4艘商船压舱箱沉积物中甲藻孢囊种群结构的分析   总被引：1，自引：0，他引：1  

戴鑫烽  陆斗定  王春生  夏平  黄雷  王采典  王红霞  黄海燕  何飘霞 《海洋学研究》2012,30(1):11-18

为了解商船压舱箱沉积物在海洋水生生物入侵过程中扮演的潜在媒介作用,本文利用光学显微镜观察法,研究了停泊于我国舟山港4艘商船压舱箱沉积物中甲藻孢囊的种类组成、孢囊密度、香农-威纳指数(H′)和PSP原因种,并对甲藻孢囊种群结构进行了相关性分析。结果表明,鉴定出的甲藻孢囊隶属于5大类,共24种,4份样品中甲藻孢囊的种群结构各有差异,但均检测出能产生麻痹性贝毒(Paralytic Shellfish Poisons,PSP)的甲藻孢囊,如亚历山大藻Alexandriumspp.和链状裸甲藻Gymnodium catenatum。在4艘商船的压舱箱沉积物中均检测出有硅藻分布,其中在富成轮压舱箱沉积物中还检测出3种未知种孢囊。通过相关性分析可知,甲藻孢囊H′值与PSP甲藻孢囊密度占总甲藻孢囊密度的比率呈负相关。甲藻可以通过商船压舱箱沉积物为传播媒介,以孢囊形式来扩大其生物地理分布,提高甲藻物种多样性可有助于降低PSP甲藻的破坏风险。因此,有效处理船只压舱箱沉积物、积极保护当地海洋生物物种多样性,对于降低外来甲藻物种(特别是一些有毒有害种)的赤潮风险和保持当地海洋生态系统的平衡,具有十分重要的意义。  相似文献   

国土资源部：严控土地使用标准力促节约集约用地     

《浙江国土资源》2012,(9):22-23

日前,国土资源部下发《关于严格执行土地使用标准大力促进节约集约用地的通知》,要求各地严格执行各类土地使用标准,加大审查力度,加强对标准执行的监管和评价。《通知》指出,要严格执行和不断完善土地使用标准。对国家发布的《限制用地项目目录》和《禁止用地项目目录》、《工业项目建设用地控制指标》,公路、铁路、民用航空运输机场、电力、煤炭、石油和天然气工程项目建设用地等控制指标,房地产用地宗地规模、容积率控制等各类土地使用标准,各地要坚决贯彻执行。  相似文献   

The error source analysis of oil spill transport modeling: a case study   总被引：2，自引：2，他引：0  

LI Yan  ZHU Jiang  WANG Hui  KUANG Xiaodi 《海洋学报(英文版)》2013,32(10):41-47

Numerical modeling is an important tool to study and predict the transport of oil spills. However, the accu- racy of numerical models is not always good enough to provide reliable information for oil spill transport. It is necessary to analyze and identify major error sources for the models. A case study was conducted to analyze error sources of a three-dimensional oil spill model that was used operationally for oil spill forecast- ing in the National Marine Environmental Forecasting Center （NMEFC）, the State Oceanic Administration, China. On June 4, 2011, oil from sea bed spilled into seawater in Penglai 19-3 region, the largest offshore oil field of China, and polluted an area of thousands of square kilometers in the Bohai Sea. Satellite remote sensing images were collected to locate oil slicks. By performing a series of model sensitivity experiments with different wind and current forcings and comparing the model results with the satellite images, it was identified that the major errors of the long-term simulation for oil spill transport were from the wind fields, and the wind-induced surface currents. An inverse model was developed to estimate the temporal variabil- ity of emission intensity at the oil spill source, which revealed the importance of the accuracy in oil spill source emission time function.  相似文献   

恐龙雕塑与展陈艺术——让昔日巨兽“复活”     

乐圆  尹超 《地球》2014,(4):106-107

当你漫步在二连浩特这个蓬勃发展的边境之城,一组巨大的恐龙雕塑群映入眼帘,它们不仅高大威武,而且神态各异,活灵活现。为二连这个中蒙边境线上最大的陆路口岸增添了一道亮丽的风景。  相似文献   

欧盟将民航运输纳入欧盟排放交易体系问题探析          下载免费PDF全文

马湘山  周剑 《气候变化研究进展》2012,8(4):285-291

按照欧盟法律,自2012年1月1日起在欧盟境内起降的航班排放将被纳入欧盟排放交易系统。通过详细解读欧盟这一法律,指出欧盟排放交易体系是典型的"上限-交易"系统,即通过规定排放上限与进行配额交易实现减排目标。欧盟此举本质目的是强化气候变化主导权,最终为经济谋利,加快完善欧盟碳交易市场以建设欧元货币权力体系。其结果可能引发其与《联合国气候变化框架公约》及《京都议定书》等国际法之间的法律冲突,购买配额将对民航运输发展造成制约,"可测量、可报告和可核实"将对发展中国家能力建设提出挑战,并将一定程度影响《联合国气候变化框架公约》下的行业减排谈判走向。  相似文献   

Simulation of Volume and Heat Transport along 26.5°N in the Atlantic          下载免费PDF全文

MO Hui-Er  YU Yong-Qiang 《大气和海洋科学快报》2012,5(5):373-378

The observed meridional overturning circulation (MOC) and meridional heat transport (MHT) estimated from the Rapid Climate Change/Meridional Circulation and Heat Flux Array (RAPID/MOCHA) at 26.5°N are used to evaluate the volume and heat transport in the eddy-resolving model LASG/IAP Climate system Ocean Model (LICOM). The authors find that the Florida Current transport and upper mid-ocean transport of the model are underestimated against the observations. The simulated variability of MOC and MHT show a high correlation with the observations, exceeding 0.6. Both the simu-lated and observed MOC and MHT show a significant seasonal variability. According to the power spectrum analysis, LICOM can represent the mesoscale eddy characteristic of the MOC similar to the observation. The model shows a high correlation of 0.58 for the internal upper mid-ocean transport (MO) and a density difference between the western and eastern boundaries, as noted in previous studies.  相似文献   

长河坝水电站左岸开关站边坡材料运输滑道施工实录   总被引：2，自引：1，他引：1  

谭文俊  黄邹涛 《探矿工程》2009,(Z1):370-372

介绍了长河坝水电站左岸开关站边坡材料运输滑道施工方案,对类似边坡工程材料运输亦具有一定的借鉴作用。  相似文献   

破损山体治理新思路          下载免费PDF全文

孙廷仁  张闻璟 《探矿工程》2017,44(3):53-57

经济的粗犷发展形成了大量破损山体,造成周边环境恶化,治理难度大。目前,对破损山体主要治理方式为覆土绿化、生态重建,需要耗费大量资金,甚至会破坏客土源地生态环境。山东省嘉祥县纸坊镇南武山区废弃石灰岩矿山经过改造设计和施工,建设山地光伏电站,为破损山体改造提供了新思路。主要采用削坡排险、危石撬除、主动网铺设、被动网架设等方法,有效减少了崖面崩塌的可能性和影响范围,为光伏设施布设腾出了大量场地。另外发明了简易运输工具,解决了崖顶材料运输问题。  相似文献