探索沈阳城市基础设施建设可持续发展之路

在国家振兴东北老工业基地的宏观背景下,本着深化改革、适度超前、突出重点、提高质量的指导思想,通过对沈阳市城市发展及城市基础设施建设之路的回顾,提出城市基础设施建设合理的模式、科学的实施方案以及可行的政策建议。合理控制和科学引导城市基础设施建设,使基础设施建设有序、快速、高效进行,形成基础设施建设可持续进行的良性循环机制。     

Effect of preparation method on physicochemical properties and catalytic performances of LaCoO_3 perovskite for CO oxidation

Perovskite oxides LaCoO_3 prepared by templating, co-precipitation and sol-gel method with different complexants were systematically characterized and its catalytic performances for CO oxidation were investigated. The samples were characterized by X-ray diffraction, thermogravimetry analysis and differential scanning calorimetry, N_2 physisorption, transmission electron microscopy, temperature program reduction of hydrogen, temperature program desorption of oxygen and X-ray photoelectron spectroscopy measurement, results of which show that the properties of LaCoO_3, such as surface morphology, surface area, surface compositions, redox capability, oxygen vacancy, as well as the calcination temperature and formation mechanism, depend intimately on the preparation method. Catalytic tests indicate that the sample prepared by carbon templating method shows the best activity for CO oxidation, with full CO conversion obtained at 135 ℃. In particular, the catalyst can be activated and significant increase of activity can be obtained with the increase of reaction time. The cyclic and longterm stability of catalysts were discussed and compared.     

Experimental study on fluidization characteristics of different-sized particles in a U-type reduction chamber

A novel fluidized bed reactor, which is an improvement of the loop seal, was applied successfully to iron ore reduction roasting. For this U-type reduction chamber, the fluid dynamic behaviors of different-sized particles were investigated via a cold experimental apparatus using the pressure measurement method in this study. The results showed that the measured U_mf of 71, 101 and 147 μm-sized particles were 0.033, 0.040 and 0.059 m/s, while the U_c were 0.167, 0.190 and 0.223 m/s, respectively, demonstrating that the decrease of particle size caused a rapid transition from both the fixed to bubbling regime, and the bubbling to turbulent flow regime. Under stable operation, the pressure drop, average solids holdup and axial nonuniformity index across the FC increased when particle size increased, along with the solids height and pressure drop gradient in the SC, though the differential pressure fluctuation decreased. These consequences indicated that larger particle size promotes the opportunity for particle mixing and contacting, accordingly increasing the preferential formation of the particle aggregation and deteriorating the reduction performance. These can provide guidelines for the regulation and control of industrial iron ore fluidized bed roasting.     

城市发展战略规划研究中的空间拓展方向分析方法

通过对沈阳市铁西新区发展战略规划的实践,提出一种从外部环境拉动、内部需求推动、自身现有基础三个视角,分别考察产业发展、空间结构、城市形象、行政效率等相关要素,来确定城市空间拓展方向的系统分析方法.     

沈阳都市圈空间范围的界定

论文从对都市圈概念的讨论和认知入手,简述了国内外都市圈空间范围界定的基本方法,尝试利用GIS技术划定沈阳一日交流圈,再综合考虑行政区划、文化认同感、产业结构、自然条件等影响条件对其进行调整,从而最终确定沈阳都市圈的空间范围。包括沈阳市域(除康平县)、铁岭市区(含清河区)、开原市、调兵山市、抚顺市区、抚顺县、本溪市区、本溪满族自治县、鞍山市区、台安县、辽阳市域。整体形态为南北狭长、东西相对较窄的近椭圆形结构。     

老工业基地城市棚户型低收入住区改造模式探讨——以沈阳市为例

以老工业基地城市沈阳为例,总结了当前政府和学界对城市棚户型低收入住区改造方式的利弊,并通过调查分析目前沈阳存在的低收入住区居住状况和居民意愿,在此基础上,从城市规划的角度探索一种可行性的低收入住区改善模式。     

地铁建设中的环境岩土工程问题分析

地铁工程是一项建设规模大、工期长、投资多、社会效益倍受关注的工程。沈阳地铁工程穿过的地层主要为砂性地层,沿线地上穿越多个商业繁华区,地下管线密集,安全要求高,施工引起的环境岩土工程问题是地铁建设风险的重要组成部分。本文立足于沈阳地铁一号线工程,结合明挖法、盾构法、施工降水等主要施工工法和手段,分析了砂性地层中与地铁施工相关的支护结构变形、位移,流沙、管涌,因土体变形和沉降引起的地面、管线和相邻建筑物的沉降和破坏,以及与施工降水相关的土体固结和地下水环境的变化等环境岩土工程问题。     

《满洲建筑杂志》中伊藤清造对于奉天宫殿的研究

在近代中国特殊的历史进程下,以伊藤清造为代表的日本学者对于中国东北地区进行了大量的建筑实物的调查研究。本文以伊藤清造对于奉天宫殿(沈阳故宫)的实地考察为研究典型,以《满洲建筑杂志》所传载的史料为依托,从微观视角着眼于伊藤清造对奉天宫殿建筑专业角度的个案调查与解读,对其专业学术文章的内容和特点进行解析和论述,以期为东北地区近代建筑文化及城市建筑现代转型的研究提供新的视域和参考。     

沈阳故宫天花和藻井装修特色

从沈阳故宫建筑装修中天花、藻井的结构、构造、和装饰三方面,通过与《营造法式》及传统做法的对比,阐述清初沈阳故宫建筑装修中天花、藻井的类型和特色。     

贵金属浆料测评系统概述

贵金属浆料品质的测评系统由新近发布的浆料规范和系列测试方法国家标准组成。测试方法包括固体含量,粘度,细度,方阻,分辨率,可焊性和耐焊性,附着力的测定。同时与国内外相关技术比较,分析和评价系统的技术特点。