基于格子Boltzmann方法的回采工作面瓦斯渗流模拟

工作面回采会导致其前方煤体中的应力重新分布，在工作面前方形成减压区，增压区和稳压区，致使回采工作面前方煤体中的渗透率沿煤层走向呈现不均匀分布，因此，不能再将煤体视为均匀介质。鉴于这一工程事实，采用格子Boltzmann方法，结合算倒，研究了煤体渗透率沿走向呈现不均匀分布情形下的瓦斯渗流规律，为回采工作面瓦斯灾害防治提供依据。研究表明：采用格子Boltzmann方法可以有效模拟回采工作面瓦斯渗流，能够生动再现瓦斯流向回采工作面这一过程。     

Delay Estimates of Mixed Traffic Flow at Signalized Intersections in China

Two characteristics of Chinese mixed traffic invalidate the conventional queuing delay estimates for western countries.First,the driving characteristics of Chinese drivers lead to different delays even though the other conditions are the same.Second,urban traffic flow in China is often hindered by pedestrians at intersections,such that imported intelligent traffic control systems do not work appropriately.Typical delay estimates for Chinese conditions were obtained from data for over 500 vehicle queues i...     

哈尔滨市大型生活垃圾堆场稳定化研究

目前大多数垃圾堆场面临着二次污染控制和封场利用的问题,综合分析了国内外对填埋场稳定化的研究成果,采用垃圾中的生物可降解有机质（BDM）作为生活垃圾堆放场稳定化状态的简易判别指标.通过对哈尔滨市5座大型垃圾堆场的垃圾BDM研究,分析了堆内垃圾稳定化的程度.     

Modeling of Spacing Distribution of Queuing Vehicles at Signalized Junctions Using Random-Matrix Theory

The modeling of headway/spacing between two consecutive vehicles in a queue has many applications in traffic flow theory and transport practice.Most known approaches have only studied vehicles on freeways.This paper presents a model for the spacing distribution of queuing vehicles at a signalized junction based on random-matrix theory.The spacing distribution of a Gaussian symplectic ensemble(GSE)fits well with recently measured spacing distribution data.These results are also compared with measured spac...     

尔滨市大型生活垃圾堆场稳定化研究

目前大多数垃圾堆场面临着二次污染控制和封场利用的问题,综合分析了国内外对填埋场稳定化的研究成果,采用垃圾中的生物可降解有机质（BDM）作为生活垃圾堆放场稳定化状态的简易判别指标.通过对哈尔滨市5座大型垃圾堆场的垃圾BDM研究,分析了堆内垃圾稳定化的程度.