空间固体润滑材料的研究现状

固体润滑材料以其蒸发率低、耐高低温、抗辐照、耐腐蚀等优点在工作于空间苛刻环境中的器械上得到了广泛的应用。综述了目前常用的层状结构物、软金属、聚合物、无机化合物和复合材料5类固体润滑材料的摩擦学特性、制备工艺和应用情况,指出了我国在空间固体润滑材料研究领域与国外先进水平的主要差距和今后的研究方向。     

汉阴县城城市空间发展及驱动机制研究

笔者希望通过解读汉阴县城地域性及城市空间发展历程，以求在寻找汉阴县城在漫长历史中城市空间演化的蛛丝马迹的同时，探寻汉阴县城城市空间发展的方向。     

宁波市地下管线动态更新及管理机制探讨

介绍了宁波市地下管线动态更新工作的开展情况,从政策依据、工作机制、作业模式、管理方法等方面对城市地下管线动态更新及管理机制进行了分析和探讨。通过近几年的实践运行,宁波市地下管线动态更新机制运行良好,效果显著,对其他城市开展此类工作具有借鉴意义。     

Integrating an urban green space typology into procedural 3D visualization for collaborative planning

Urban green spaces offer multiple ecosystem services (ES), which provide a variety of benefits to human well-being. Yet in urban planning they are not taken into account systematically. Recently new tools have been developed integrating ES into procedural modeling and visualization to raise stakeholder awareness for the explicit ES trade-offs that have to be made. These tools yet do not allow fast and comprehensive integration of ES provision in urban environments. In this paper we show how urban green space typologies can be linked to ES provision for facilitating collaboration between stakeholders of different backgrounds. Based on a generic typology green spaces were mapped and linked with information on potentially provided ES and their parameters. Further, pattern designs of the green space types were described with a form-based code. Both the map of green space types and the pattern designs were integrated into the parametric modeling and visualization chain of Esri CityEngine resulting in 3D visualizations of the green space patterns and correlating ES indicators. The green space typology allows for integrating different kinds of knowledge from both science and practice communities. The procedural model enables rapid interactive visualization of urban patterns and calculation of simple indicator values on the provision of ES. The simple approach for mapping green space types with low data requirements and the generic green space design patterns allow for transferability to other places and application to large areas. The developed approach is simple and fast yet comprehensive to communicate the vital importance of all green space types within the urban environment.     

Representation of facial expression categories in continuous arousal–valence space: Feature and correlation

Representation of facial expressions using continuous dimensions has shown to be inherently more expressive and psychologically meaningful than using categorized emotions, and thus has gained increasing attention over recent years. Many sub-problems have arisen in this new field that remain only partially understood. A comparison of the regression performance of different texture and geometric features and the investigation of the correlations between continuous dimensional axes and basic categorized emotions are two of these. This paper presents empirical studies addressing these problems, and it reports results from an evaluation of different methods for detecting spontaneous facial expressions within the arousal–valence (AV) dimensional space. The evaluation compares the performance of texture features (SIFT, Gabor, LBP) against geometric features (FAP-based distances), and the fusion of the two. It also compares the prediction of arousal and valence, obtained using the best fusion method, to the corresponding ground truths. Spatial distribution, shift, similarity, and correlation are considered for the six basic categorized emotions (i.e. anger, disgust, fear, happiness, sadness, surprise). Using the NVIE database, results show that the fusion of LBP and FAP features performs the best. The results from the NVIE and FEEDTUM databases reveal novel findings about the correlations of arousal and valence dimensions to each of six basic emotion categories.     

How the Beast really moves: Cayley analysis of mechanism realization spaces using CayMos

For a common class of 2D mechanisms called 1-dof tree decomposable linkages, the following fundamental problems have remained open: (a) How to canonically represent (and visualize) the connected components in the Euclidean realization space. (b) How to efficiently find two realizations representing the shortest “distance” between two connected components. (c) How to classify and efficiently find all the connected components, and the path(s) of continuous motion between two realizations in the same connected component, with or without restricting the realization type (sometimes called orientation type).For a subclass of 1-dof tree-decomposable linkages that includes many commonly studied 1-dof linkages, we solve these problems by representing a connected component of the Euclidean realization space as a curve in a carefully chosen Cayley (non-edge distance) parameter space; and proving that the representation is bijective. We also show that the above set of Cayley parameters is canonical for all generic linkages with the same underlying graph, and can be found efficiently. We add an implementation of these theoretical and algorithmic results into the new software CayMos, and give (to the best of our knowledge) the first complete analysis, visualization and new observations about the realization spaces of many commonly studied 1-dof linkages such as the amusing and well-known Strandbeest, Cardioid, Limacon and other linkages.     

Reprint of “Emergent public space: Sustaining Chicano culture in North Denver”

Vacant land located in deteriorating neighborhoods collects physical detritus and social malaise; overt signifiers of urban blight, these spaces often become gathering places for garbage instead of people, illicit activity instead of civility. This essay deconstructs what happens when community activists appropriate, develop, and continually manage vacant land in manners that align with and express their community’s culture. Moreover, it deconstructs the metamorphosis of vacant land into public space. Part of a larger research project exploring the roles public space plays in neighborhood change, this ethnography centers in Sunnyside, a gentrifying neighborhood in Denver, Colorado. Combining ethnographic and archival methods, I explore how the physical, regulatory, and cultural facets interrelate to form something rather remarkable—public space on private property. The “Troy” Chavez Memorial Peace Garden is at once a community garden, a pedagogical space, and a memorial to the 108 youths who died in Denver’s 1993 “summer of violence”. Twenty years later it is still cherished as a garden and a memorial, as a living artifact of Aztec culture, and as a publicly accessible space that contributes to the cooperation between neighborhood old-timers and newcomers. Turning scholarly discourse of the privatization of public space on its head, I unpack the processes contributing to the publicizing private space.     

A comprehensive model of colour appearance for related and unrelated colours of varying size viewed under mesopic to photopic conditions

CIE has recommended two previous appearance models, CIECAM97s and CIECAM02. However, these models are unable to predict the appearance of a comprehensive range of colours. The purpose of this study is to describe a new, comprehensive colour appearance model, which can be used to predict the appearance of colours under various viewing conditions that include a range of stimulus sizes, levels of illumination that range from scotopic through to photopic, and related and unrelated stimuli. In addition, the model has a uniform colour space that provides a colour‐difference formula in terms of colour appearance parameters. © 2016 Wiley Periodicals, Inc. Col Res Appl, 42, 293–304, 2017     

基础偏位不稳定条件下大跨度钢桁架结构滑移支座纠偏吊装施工技术

结合宁德火车站站台雨棚桩基础出现偏位且处于不稳定状态情况以及工程工期紧迫的现实要求,提出了滑移支座施工方案。介绍了滑移支座纠偏吊装施工工艺、操作要点及质量安全控制措施。结合工程应用实际对技术经济效益及社会效益进行了分析。     

空心薄壁墩施工技术初探

通过介绍韩家庄1号桥薄壁墩翻转模法的施工,对薄壁墩翻转模施工进行了详细论述,并针对影响高墩施工精度的因素提出了预防措施及质量安全措施,以期指导类似桥梁施工。