捆绑式望远镜中间块对镜筒指向误差的影响分析

运用SolidWorks软件的静态分析模块,将捆绑式望远镜中间块的动态分析转化为0°~90°范围内,均匀分布的18个位置的静态分析。中间块每转动5°,对其上基面的镜筒连接圈的位移变化进行数据采集一次,计算出各镜筒之间的夹角变化值并进行对比,最终得到镜筒之间的最大指向误差。此方法为解决同类问题提供了参考价值。     

上海地铁一号线曲线钢轨侧磨研究

主要针对上海地铁一号线曲线钢轨侧磨进行研究,阐述了钢轨接触疲劳裂纹的产生及曲线侧磨超限过程,提出工务部门为减缓曲线侧磨超限采取的措施,从而正确认识和掌握曲线侧磨的发展规律,主动进行超前防范。     

结合后现代主义理念解读王澍建筑作品的“瓦片情结”

中国建筑师王澍获得了2012年度普里兹克建筑学奖。其作品与后现代主义理论有着一定的关联。结合后现代主义理念分析其作品表现出的“瓦片情结”，解读其中潜藏着的文化内涵。     

广州市地下空间开发利用的展望

分析了国内外地下空间开发利用现状，概述了广州市地下空间开发利用情况，预测了广州市未来地下空间发展方向，提出了广州市地下空间开发利用的可持续发展策略，对广州市地下空间开发利用具有一定的参考意义。     

Artistic information extraction from Chinese calligraphy works via Shear-Guided filter

Chinese calligraphy is a unique visual art, and is still emitting fascinating artistic brilliance and charm. The artistic beauty of Chinese calligraphy is constituted by two elements, i.e., form and spirit, which attract continual attentions by calligraphy artists. In this paper, we present Shear-Guided filter to extract the artistic information. Shear-Guided filter is designed by combining the shear transformation and the guided filter. It has both the edge-preserving smoothing property from the guided filter and the linear multidirectional property from the shear transformation. Shear-Guided filter can extract more spirit information from the calligraphy images, especially in the half-dry strokes. Furthermore, the previous evaluation parameters consider all pixels equally, which is against the truth. Here we put forward three new parameters to solve this issue. Finally, experiments show that Shear-Guided filter can extract the information of form and spirit more accurately, and the new evaluation parameters have better performances in evaluation.     

Numerical simulation of air ventilation in super-large underground developments

Recent advancements in engineering technology have enabled the construction of super-large underground engineering projects in China. Currently, the ventilation requirements and standards of normal-size underground spaces are used for super-large underground excavating engineering projects in China. For example, the minimum air velocity of 0.15 m/s is the standard velocity for normal-size underground spaces; however, this value is also used as the required air velocity for diluting underground contaminants in super-large underground developments. This paper aims to examine the minimum ventilation requirements for super-large underground developments (S > 100 m²). A three-dimensional computational domain representing a full-scale underground space has been developed. The pertinent parameters such as dust concentration, smoke density, oxygen concentration and air temperature have been simulated. The results show that at some specific underground conditions, the ventilation air velocity of 0.15 m/s is sufficient to control the dust level, provide required oxygen concentration and maintain the air temperature at acceptable levels during development; however, it is not sufficient to bring the CO concentration below an acceptable safe limit. This must be considered by the ventilation system designers of super-large underground developments.     

Overview of underground coal gasification operations at Chinchilla,Australia

Underground coal gasification (UCG) is a process which converts deep, un-mineable or difficult to mine coal resources into syngas which can then be converted into valuable end products such as electric power, liquid fuels, synthetic natural gas and chemicals. This paper provides a summary of the UCG operations conducted at the Chinchilla Demonstration Facility in Australia, focusing on gasifiers constructed using directional drilling. A number of the experiences and key lessons learned from operating multiple underground gasifiers over several years at the facility are described. Implications for the implementation in commercial projects using UCG are also discussed. Finally, the potential of UCG as a method for producing syngas from deep coal is discussed and some of the challenges and opportunities are summarized.     

城镇区域城7tr地下管线信息化管理研究——以佛山市顺德区容桂街道为例

伴随着我国城镇化推进速度的加快，开展镇街城市地下管线信息化管理工作势在必行。本文以佛山市顺德区容桂街道为例，分析了镇街地下管线信息化管理的现状及存在的问题．针对问题提出相应的建议及措施，在一定程度上为其它城镇开展同类工作提供参考。     

工程定额对标管理在基建项目中的应用现状

该文主要叙述了工程定额对标管理在基建项目中的应用现状。     

The Underground Atlas Project

The systematic recording of underground structures, their location, use as well as other characteristics is something that is still missing from the global engineering community. The paper presents the development of the Underground Atlas Project which aims at gathering and indexing the major underground sites worldwide, becoming the focal point of information regarding subsurface structures. The main features of the project are found in the development of the electronic database to store and depict the spatial information of the site, as well as in the crowdsourcing concept that was selected for the data and information submission. To foster the submission process, a new taxonomy and categorization of underground space uses has been proposed, while a respective web service and mobile app was developed by the design team. The users can either browse through the records stored or, more importantly, can submit new content either by using their browser or by taking advantage of the geolocation capabilities of their mobile device. Finally, the Atlas will provide the opportunity for the meta-analysis of the data by using and benefiting from the accumulated knowledge and collective experience of the engineering community.