Determining Stability Constants Using the AKUFVE Technique

ABSTRACT

The AKUFVE techniques were developed by Rydberg and co-workers in the 1960s. The main aim was to be able to perform a series of liquid-liquid extraction data varying one or more parameters and at the same time achieve very pure phases. As such, this technique was later used for short-lived isotope studies in the SISAK system, but also as a standalone unit for a large number of thermodynamic studies of extraction systems both for fundamental understanding as well as more applied investigations. In this paper, the apparatus with modifications made over the decades is described. In addition, studies with stability constant determinations for the zirconium-water-acetylacetone system as well as lanthanide extraction using bromodecanoic acid are exemplified to demonstrate the potential use of the technique. The results shown clearly demonstrate the versatility and ability of the AKUFVE system.     

Landscape structure indices for assessing urban ecological networks

Analysis and planning of ecological networks is a relatively new phenomenon and is a response to fragmentation and deterioration of quality of natural systems. In urban areas, the problems of land use intransigence, political and jurisdictional issues create a difficult environment for implementing ecological networks. The specific questions addressed in this research program revolve around the viability of planning an ecological network in an urban landscape. The development and articulation of an ecological network plan was undertaken previously and in this paper, a series of assays of landscape structure are used to examine the viability of an ecological network in the Phoenix, Arizona urban area. Three principal analyses were utilized: (1) patch content analysis, (2) corridor content analysis, and (3) network structure analysis. Patch and corridor content analyses examined the internal characteristic and immediate context for each of the 89 ecological network elements. The network structure analysis incorporates a process for aggregating results of patch and corridor analyses and incorporates indicators that describe interrelationships between landscape elements. For each of these analyses the existing condition was compared to the optimal plan to demonstrate the level of change that can be expected. The results and conclusions of this research are that an ecological network plan provides modest but important improvement in ecological systems in the Phoenix urban area.     

城市人行地道现状及设计对策分析

对城市人行地道的优缺点进行了分析,提出了一些设计对策,指出人行地道的设计应作为城市空间节点的组成部分来考虑.     

两个"住"的实验

本文介绍了笔者参与的两个关于中国住宅竞赛的实验……希望引发设计者重新思考众多因素对居住的影响。"     

拉美城市高级住区与消费景观占有不平等研究——以巴西里约热内卢为例

在拉美城市中,城市边界迅速扩张,强势群体占据了环境优美地段的高级住区,这成为城市消费景观环境不平等的有力实证。强势群体利用自身的经济、政治优势占据了城市中环境和设施相对优越的区域,并形成与周围区域隔离的堡垒式高级住区,成为拉美城市司空见惯的现象。本文以巴西的里约热内卢大都市区为例,基于其城市高级住区和消费景观毗邻分布的历史背景和现状,探讨并分析了这一现象,期望能为我国现阶段政府调控市场经济转型时期的城市消费景观环境不平等提供有益的借鉴。     

提高低造价住宅的设计质量——美国规划建筑界的一个讨论会

作者介绍了美国一个关于提高低造价住宅的设计质量的设计质量的讨论会,将改进低造价住宅设计问题作为中心议题,阐述规划师应提倡改善实用、实惠,实在的低造价住宅设计质量的重要性,回答了应从哪些方面改进设计质量和如何付出努力的问题。     

"三缺一"情境下的空间演绎与营造——广州图书馆新馆设计竞赛评析

本文简要介绍了广州图书馆新馆设计国际邀请竞赛的背景和概况,分析了项目基地的特殊空间情境,从建筑体量的呼应、空间形态的协调、图书馆文化特性的缔造等几个方面,对竞赛方案的空间环境演绎与营造进行评析,探讨了相应的设计方法和策略,以期对国内类似的工程建设提供参考。     

“实调控”型规划理念的应用研究——以南平市城镇体系规划为例

文章在传统城市规划编制进行客观评价的基础上,对"实调控"规划原则和框架作出具有创新的探讨,并结合南平市实际进行关键性的区域"实体"控制规划和城镇空间拓展规划,最终构建的区域协调发展空间,更好地促进南平市城市化与自然机体健康、和谐地发展,真正体现规划编制的人文风向、公平道义和前瞻眼光。     

山居逸境--中海盐田项目规划及建筑设计

此项目详细地介绍了中海盐田项目,探讨了山地建筑的设计手法,提出结合地形布置建筑、结合山景设计景观等原则。