电镀锌基合金的耐蚀性

近年来,在表面处理方面,由于锌基合金呈现出很多优良的性能,特别是高的防护性,已越来越受到人们的青睐。对电镀锌基合金（主要是锌与铁族形成的合金）的性能进行了综述,并重点讨论了锌基合金的耐蚀性。     

磨粒图象背景光照不均匀分布图象预处理

针对磨粒图片背景亮度呈现分布不均的问题，采用两种计算机图象处理方式进行了预处理，得到比较完整的二值图。第一种方式是：在没有铁磨粒情况下采集背景亮度变化，通过数字处理得到背景亮度变化的差值，然后将亮度补偿到铁谱图上。试验结果表明，该方法在边缘信息损失很小的情况下，得到磨粒二值图。第二种是：在不能得到背景光的条件下，通过一阶和二阶差分处理及其变形方法，来消除背景梯度变化，从而消除背景光的低频噪声。从试验效果来看，一阶和二阶差分不仅能进行边缘检测，而且能通过卷积运算消除背景光分布不均，磨粒边缘有点扩大，有些少量信息损失掉了，这种损失可以用图象形态学中的腐蚀的方法消除。两种方法相比，采用背景补偿的方法效果更好一些，在条件许可的情况下尽量采用背景光补偿方法：     

浅谈家具材料折射出的社会性特征

家具材料可反映一个时期的科技发展水平、反映当时的生态环境状况、折射社会共同关注的问题并可作为经济文化交流的佐证,具有鲜明的社会性。     

基于ArcGIS的土方量计算与可视化

利用ArcGIS三维构面的特性,形象的构建地表、河道现状立体模型,同时根据场地、河道的设计标高,构建立体模型,然后选定统一参考面,计算两个模型到参考面的体积之差,可以快捷、准确地计算出挖填土方量。实践证明,这一算法较传统的根据等高线、高程点计算土方量的方法更加严密、准确、便捷。同时这一方法能根据要求灵活调整、分割土方计算区域,不需要对调整后的边界进行外业高程点数据处理就能快速实现分区域土方量计算。     

中国的文字与建筑

中国文字起源于"象形",即其本身就是一种"图画",将"图画"简略到不可或缺的程度就成为"文字"。该文试通过对甲骨文、金文等这些原始字体中有关建筑文字的描述和分析,找到文字与建筑实体的微妙联系,阐明关注字体演变对研究建筑外形和内容演化的重要意义。     

我国古代书院建筑的伦理学诠释

中国传统建筑文化源远流长,作为它的组成部分之一的书院建筑,在唐朝已经开始形成.该文通过对书院园林的分析．从伦理学的角度探讨了书院园林空间所体现出采的“礼乐相成、情理并重、天人争一、以人为本”的中国传统文化的哲学基因。     

AutoCAD中圆弧折线化方法与实现

AutoCAD作为一种重要的地形图制图软件,图中存在大量的圆弧图元。由于圆弧只有端点或圆心坐标,弧线本身缺乏精确的坐标信息,因此导致一些数据检查时出错。Auto CAD软件本身不提供圆弧转折线的功能。本文尝试采用等角切分方法,利用VBA二次开发技术,在保持图形原有特征及精度要求的前提下,将圆弧、圆及多段线中的圆弧分别转换为纯折线的多段线,从而去除圆弧部分。满足基础地理信息数据库建库等特殊的数据需求。     

Architecture as a Dissident Practice: An Interview with Diller Scofidio + Renfro

For three decades architect Liz Diller and artist Ricardo Scofidio have been collaborating on projects that test the boundaries between art and architecture. They have done more than any other practice to champion interdisciplinary research and to advocate architecture as a wider form of cultural production. Olympia Kazi went to talk to Liz Diller to ask her if she thinks theory could really be dead, or merely in a ‘lull’. Copyright © 2009 John Wiley & Sons, Ltd.     

彩超顺序分段分析法对矫正型大动脉转位的诊断价值

目的：探讨彩色多普勒超声心动图顺序分段分析法对矫正型大动脉转位（CTGA）的诊断价值。方法对11例 CTGA 患者采用彩色多普勒超声心动图顺序分段分析法判定心脏位置、连接关系及心内结构、功能和血流信号的变化。结果11例 CTGA 患者中,彩色多普勒超声心动图顺序分段分析法对 CTGA 的诊断符合率达100．0％（11/11）。SLL 型（心脏位置正常）9例（81．8％）,IDD 型（镜面右位心）2例（18．1％）。SLL 型合并室间隔缺损9例、合并肺动脉狭窄7例和合并解剖三尖瓣中度反流8例;合并房间隔缺损4例,其中 SLL 型3例,IDD 型1例;IDD 型合并室间隔缺损、肺动脉狭窄和解剖三尖瓣中度反流1例。均经手术证实。结论CTGA 的超声表现错综复杂,心房与心室连接不一致和心室与大动脉连接不一致是诊断 CTGA 的关键,运用其特征性能有效提高诊断符合率,部分替代心血管造影等检查,为心胸外科提供重要的诊断依据。     

Land cover mapping with patch-derived landscape indices

Automated-classification procedures of satellite imagery are mainly based on surface reflectance and generally ignore shape and size of landforms. On the other hand, quantitative landscape ecology has been focused on the patch concept as a landscape unit due to its relevance in the theory and practice of the conservation of species in human-modelled landscapes. The present paper explores how landscape metrics can introduce the component of spatial pattern of landscape elements to enhance land cover classification reliability. In particular, a method is proposed to extract patch-derived indices and to introduce them in a supervised classification of Landsat Thematic Mapper (TM) images as neo-channels. To extract patch-derived indices, an image segmentation method based on edge detection was used to define patches without an a priori knowledge of land cover classes. We calculated four patch indices: area, perimeter, shape index and fractal dimension. These indices were introduced in the classification to test the improvement of classification reliability. Well-known additional information (texture and topographic features) was also tested for comparison purposes. The method was tested for mapping land cover types in a mountainous region in the French Pyrenees, the Massif of Arize. The results of classification reliability allowed us to conclude that patch indices and topographic features significantly improved the discrimination of land cover classes. The combination of these additional information types by means of data fusion is useful for land cover classification purposes.