沿海港口煤炭专业化运输系统适应性探讨

结合全国煤炭生产消费及调运情况,分析北方煤炭下水港布局、后方铁路通道规划建设及煤炭下水趋势对专业化煤炭下水港未来发展的影响,研究南方煤炭接卸港码头布局、外贸进口煤炭和煤炭中转基地建设及接卸港发展趋势对接卸港布局及建设的影响,对全国沿海港口煤炭专业化运输系统分区域、分结构的适应性进行探讨,并提出问题及建议。     

Numerical Simulation of Advanced Geological Forecasting Based on Multi- Source Seismic Interferometry北大核心CSCD

For existing advanced geological forecasting, the forecast distance is short and the test frequency is high, increasing test and construction risks. Since various methods have different requirements for the test environ-ment, preparation work can be tedious and result in a long construction time thereby affecting normal construction.A new advanced geological forecast technique based on multi-source seismic interferometry for tunnels is proposed.This technique uses the blast at one end of tunnel as a centrum and receives the signal at the other end of the tun-nel, therefore allowing advanced geological forecasting of the unexcavated tunnel part by relative processing and im-aging. A numerical simulation of this kind of geological forecasting using the finite difference method to simulate two kinds of unfavorable geological bodies (karst and a fault) predicted them accurately and verified the effective-ness and accuracy of this geological forecasting method. © 2018, Editorial Office of "Modern Tunnelling Technology". All right reserved.     

基于石墨烯的柔性薄膜电极进展

石墨烯具有诸多优异的物理、化学特性,在电化学储能领域得到了广泛的关注。本文综述了石墨烯薄膜以及石墨烯复合材料薄膜在锂离子电池以及超级电容器柔性电极中的应用进展。根据石墨烯在柔性电极中作用的不同分为三个部分结合研究实例分别论述,并对石墨烯基薄膜电极材料在柔性电化学储能器件中的应用前景进行了分析和展望。     

全固态锂离子电池的研究进展

本文着重介绍了固态电解质的特性,包括聚合物电解质、氧化物电解质、硫化物电解质;分析了固态电池的应用现状,指出了固态锂电池技术未来的发展趋势。     

A two-phase model for dry port location with an application to the port of Dalian in China

This paper provides guidance for an optimal and reasonable dry port layout for the port of Dalian in China. We present a two-phase framework on the location of dry ports, which solves the selection of candidate inland cities and optimal dry port location choice, respectively. Fuzzy C-Means Clustering is applied to select alternative cities in the vast hinterland of the seaport of Dalian, with a view to identify evaluation factors that affect the location selection decision. A cost-minimisation linear programming solution is proposed, with the aid of a genetic algorithm, to choose the optimal location as well as capacity level among the candidate inland cities.     

Exploring airline passengers’ willingness to pay for carbon offsets

This study examines airline passengers’ willingness to pay for carbon-offsets. Using the contingent valuation method of double-bounded dichotomous choice format and a survey of over 1000 Taiwanese passengers flying to countries in Asia, Europe, North America, and Oceania to gauge their willingness-to-pay for airline carbon-offsets. The results suggest that despite the trip characteristics and personal background, air travel passengers’ knowledge and perceptions of the carbon-offset scheme also greatly influence the stated willingness to pay.     

隧道内爆炸作用衬砌结构的动力响应和损伤机理研究

隧道内爆炸作用可能导致其衬砌结构的破坏和坍塌,造成车辆通行受阻和生命财产损失。为了研究隧道衬砌结构的抗爆性能,应用AUTODYN软件建立了隧道衬砌-岩石-土壤的三维数值模型,并考虑炸药-空气-结构的流固耦合相互作用,以及隧道内爆炸作用对衬砌结构的动力响应和损伤机理进行了数值模拟分析。结果表明:在不同炸药量作用下,超压峰值及冲量以爆心地面投影点为中心,向四周迅速衰减,表现出一定的规律性;离爆心最近的底板首先出现损伤,并向四周扩展,直墙角部由于受到底板竖向变形而引起的拉应力作用,较早地出现损伤,在直墙壁和拱顶产生纵向和环向的裂缝,这些裂缝把整体式隧道衬砌结构分割成大小不等的混凝土块体。     

海底盾构隧道孤石爆破预处理关键技术

文章针对基于孤石形状、分布位置的随机性及其高强度,盾构机无法直接掘进通过这一工程难题,在前期物探及钻孔验证的基础上,对钻孔参数和爆破方案设计进行了分析;通过采用对临近隧洞爆破震动跟踪监测和爆破后炮孔取芯验证的方法,总结出了一套针对海底盾构区间孤石爆破预处理的施工方法.     

船舶操纵模拟器上海洋山港港区三维视景仿真

针对船舶操纵模拟中的三维视景仿真的特点,开展船舶操纵模拟器中关于上海洋山港港区三维视景仿真的研究。以Google Earth提供的电子地形图像为基础,经过等高线和矢量化方法的处理,生成数字高程模型(Digital Elevation Model,DEM),并利用Multigen Creator建立直观的上海洋山港港区三维地形模型,再利用Vega的三维视景渲染功能对其进行渲染和驱动。根据该方法建立的上海洋山港港区三维视景模型库在模型精细度、逼真度和实时运算等方面,都能满足船员实操练习所需的条件。     

基于规范的牺牲阳极阴极保护优化设计方法

牺牲阳极阴极保护设计缺乏针对单块阳极形状尺寸和整体方案的优化方法。为解决此问题,首先引入细长系数和扁平系数的概念;然后基于规范推导无涂层时牺牲阳极形状尺寸与所需牺牲阳极总数量和总质量之间的关系;接着利用结构物的极化要求和牺牲阳极材料的消耗要求等确定牺牲阳极形状尺寸的可行域;最后结合经济性指标建立完整的优化问题模型并给出求解方法。此优化设计方法能够确定牺牲阳极形状尺寸和获得经济性最优的整体方案。