基于整体性视角的社区更新：框架、模式与案例 — —以佛山桂华邨社区为例

现行的政府单一主导、政府与开发 商合作的社区更新模式与业主的自主更新需 求产生了矛盾。针对现有研究对社区更新的 系统性缺乏关注的问题，本文从整体视角出 发，通过构建“参与主体—程序设计—法规 政策—资金调配”四维框架，分析现行社区 更新模式与业主自主更新需求产生冲突的内 在机制。在优化现有模式的基础上，提出三 种适应业主自主更新需求的理论模式。桂华 邨业主自主更新失败的实践案例证明了本文 所提出的四维框架的重要性。最后，从政府 视角对我国社区更新机制提出优化建议。     

Modification of platinum surfaces by spontaneous deposition: Methanol oxidation electrocatalysis

The presence of a second metal on platinum surfaces affects the performance of methanol oxidation. However, most of the electrocatalytic reactions are studied by using electrochemically deposited platinum alloys, but in the case of spontaneous deposition the situation is not so clear since the surface distribution, stability and morphology are usually not well documented. The formation of surface decorated samples on mono- and poly-crystalline platinum is followed by electrochemical and spectroscopic techniques and analysis of their performance towards methanol adsorption and oxidation compared with that on pure platinum. Pt/Sn and Pt/Ru are of special interest because of their well-known performance in methanol fuel cells. Methanol oxidation on Pt(111)/Ru, Pt(111)/Sn and Pt(111) shows that ruthenium is the only one able to promote the reaction since the simultaneous dissolution of tin occurs and competes with the process of interest. The in situ infrared spectroscopy is used to compare methanol oxidation on Pt(111)/Ru and Pt(111) in acid media using p-polarized light. The formation of bridge bound carbon monoxide is inhibited in the presence of ruthenium ad-species, whereas on Pt(111) the three adsorption configurations are observed. Linear sweep polarization curves and Tafel slopes (calculated from steady state potentiostatic plots) for methanol oxidation are compared on polycrystalline surfaces modified by tin or ruthenium at different coverages. There is almost no change in the Tafel slopes due to the presence of the foreign metal except for Pt/Ru, where a 0.09 V decade⁻¹ slope was calculated below 0.55 V due to hydroxyl adsorbates on ruthenium islands. The anodic stripping of methanol residues on the three surfaces indicates a lower amount of carbon monoxide-type adsorbates on Pt/Ru, and the simultaneous tin dissolution process leading to residues oxidation on Pt/Sn electrodes.     

Preparation of clean coal by flotation following ultra fine liberation

This paper reports the results of current fundamental research at the Department of Process Engineering, University of Miskolc on the processing of clean coal from Mecsek bituminous coal, Southern Hungary. The theoretical possibility of the separation of different petrographic components was proven experimentally and their liberation degree was determined based on the petrographic composition, flotation kinetic study of isolated components (groups of components), scanning electron microscopy and microprobe analyses. The mill with stirred ball media was chosen for the ultra-fine liberation of the coal components. It was revealed that along with the liberation of coal components, their surface oxidation and spontaneous agglomeration, entrapping the mineral impurities take place in ultra-fine grinding. This paper discusses the interfacial phenomena occurring in the ultra-fine grinding process and their influence on the flotation. The concept for the advanced preparation of clean coal was developed, tested and proved. The main steps of this concept are the ultra-fine liberation in the stirred-media mill, the de-agglomeration of flocs spontaneously formed during the ultra-fine grinding and the induced (hydrophobic) flocculation with the following two-step flotation in a flotation column.     

硫化矿石氧化性的实验室综合评判

探讨了一种硫化矿石氧化性综合评判的新方法 ,并将该方法应用于矿山实际 ,得到了准确的评判结果。该项成果对于硫化矿石自燃防治理论与技术的研究具有很高的参考价值。     

MEMORY·童年·印象--合肥市政务文化新区儿童公园概念性方案

合肥市政务文化新区儿童乐园的概念性方案,充分考虑了儿童的心理和成长交流需要,以儿童的自发活动为特色,兼顾各类活动设施,创造丰富活动空间,构筑了一个富有感染力、空间变幻多彩的都市儿童乐园.     

Effect of mineral matter on coal self-heating rate

Adiabatic self-heating tests have been conducted on subbituminous coal cores from the same seam profile, which cover a mineral matter content range of 11.2-71.1%. In all cases the heat release rate does not conform to an Arrhenius kinetic model, but can best be described by a third order polynomial. Assessment of the theoretical heat sink effect of the mineral matter in each of the tests reveals that the coal is less reactive than predicted using a simple energy conservation equation. There is an additional effect of the mineral matter in these cases that cannot be explained by heat sink alone. The disseminated mineral matter in the coal is therefore inhibiting the oxidation reaction due to physicochemical effects.     

首尔地面公交系统改革的成功经验

随着经济、人口的快速发展,首尔开展了一次针对地面公交系统的成功而深刻的变革。其中包括组建以公众参与为基础的公交系统改革公民委员会,形成了“以线路连接为导向的公交系统”,采用新型公交智能卡、票价新制度以及信息一体化的管理系统。     

积极引导新社会阶层有序参政议政的思考

改革开放30年来中国社会结构发生的最大变化是新社会阶层的形成。随着社会主义市场经济体制的初步建立,新社会阶层的队伍不断壮大,使中国经济、社会的影响力也越来越大,并在政治舞台上渐渐有了一席之地。人们参政愿望的强烈、自身素质的提高以及参政过程中存在的不同程度的问题,为新社会阶层有序参政提供了可能性和必要性,而执政党的积极引导则成为新社会阶层有序参政议政的领路航标。     

基于修正灰色马尔科夫模型的煤自燃预测

煤自燃系统是一个复杂的巨系统,具有规律性、非线性和随机波动性特点,因此在煤自燃预警系统中利用单一的灰色预测方法很难对其动态发展趋势做出准确的预测.针对上述问题,提出一种将灰色模型和马尔科夫模型相结合对煤自燃进行预测的方法.首先建立煤自燃的GM(1,1)模型,其次以GM(1,1)模型预测值为基础进行马尔科夫预测,然后用平均残差修正预测值.仿真结果表明,灰色马尔科夫模型比灰色模型预测精度明显提高,平均误差减少2.24％,为煤层优化检测提供了依据.     

成都市大学生体育参与性影响因素的探讨

大学生体育参与性直接影响到大学生身体素质的提高,对构建和谐、文明与健康的校园文化具有重要影响。以成都市部分高校在校大学生为研究对象,对影响大学生体育参与性的因素进行了探讨,发现学校体育、社会环境、气候与设施、自身身体与经济条件是影响大学生体育参与性的主要因素。