广州银行大厦

<正>随着社会的迅猛发展,越来越多的超高层写字楼林立在人们面前。而作为广州CBD区域的珠江新城,许多风格不一的超高层建筑更是如百花争艳般涌现出来。地处珠江新城中轴绿化核心旁一显要位置的广州银行大厦,为了争取从周围烟草大厦、利通大厦等超高层办公楼的竞争中脱颖而出,必然要求有其独特的优点。设计师为此精心设计,从不同方面思考超高层写字楼的特性,力求打造珠江新城具有强烈标识性的超高层办公楼。     

Numerical study of solid particle erosion on the tubes near the side walls in a duct with flow past an aligned tube bank

Computational fluid dynamic (CFD) tool has been applied to investigate the erosion of duct walls and that of tubers (10 × 10 aligned tube bank in the duct) near side walls, which is caused by coal ash particle impaction. The flow field is obtained by using direct numerical simulation (DNS) method. The coupling between tubes and flows are made through the immersed boundary technique. Particles are tracked by using Lagrangian approach and further coupled with gas phase. Four coal ash particles are considered 6.2, 20, 80, and 200 μm. In the end, the erosion of the duct walls and that of the tubes near side walls has been well predicted and characterized. © 2009 American Institute of Chemical Engineers AIChE J, 2010     

Process development and modeling of pyruvate recovery from a model solution and fermentation broth

The mono- and bi-polar electrodialysis processes for pyruvate recovery and pyruvic acid generation, respectively, were examined in order to determine their feasibility for application in the pyruvate production process. Under optimum process conditions (constant current mode i = 39.7 A m⁻², pyruvate model solution c_p = 50 g dm⁻³ in the monopolar electrodialysis experiment pyruvate flux reached 367 g m⁻² h⁻¹ and specific energy consumption was 1.4 kWh kg⁻¹. In the bi-polar electrodialysis experiment under optimum process conditions (constant current mode i = 9.6 A m⁻², pyruvate model solution c_p = 48 g dm⁻³, pyruvate flux reached 125 g m⁻² h⁻¹ and specific energy consumption was 1.5 kWh kg^-1. Generally speaking, performances of the bi-polar electrodialysis were equal to the best process conditions observed with mono-polar electrodialysis. On the other hand, current densities investigated in the bi-polar electrodialysis experiments were four-fold lower than those applied in the mono-polar electrodialysis experiments. Additionally, a mathematical model to represent the ion and water transport behavior of an electrodialysis process for concentrating pyruvic acid under the influence of different current density was developed. Estimation of both the model parameters and model validation were demonstrated in the work.     

适合于麻柳场气田新的"一点法"产能方程

在蜀南气矿麻柳场气田进行了大量的稳定试井工作,分别用传统的多点法二项式、指数式处理资料,以及用“一点法”产能公式进行资料处理,发现两者求出的气井绝对无阻流量偏差达到30%-90%,甚至更高。结合该气田实际情况,提出建立气井“一点法”产能方程的新思路——将气藏性质、流体性质、渗流状况看成一个气藏的“黑箱”系统,根据pD-qD间配对关系,对实测数据组进行拟合,求出最佳拟合曲线,最终建立气井产能方程。     

Evaluation of three test methods in determination of formaldehyde emission from particleboard bonded with different mole ratio in the urea–formaldehyde resin

The use of urea–formaldehyde (UF) resins with lower contents of free formaldehyde in the board industry has led to products with very low emissions of formaldehyde. In this study, a detailed account is given of how UF resins with different mole ratios of formaldehyde to urea within the range of 0.97–1.27 influence the formaldehyde emission. In order to evaluate simpler laboratory methods for determining the formaldehyde emission from particleboard, the desiccator (JIS A 5908, 2003) and the EN 120 (European Standard, 1991) have been compared with the 1 m³ chamber method SS 270236 (Swedish Standard of determining formaldehyde emission with chamber test, 1988). Good relationships were obtained between the methods studied with correlation coefficients of >0.9. The value of formaldehyde emission decreased linearly with the mole ratio of formaldehyde to urea down to 1.05 where the effect smoothed out. The effect on the formaldehyde emission of temperature and storage time for tested boards also was studied. The heat treatment lowered the perforator value with resins that had mole ratios equal to or higher than 1.15, at the two lowest mole ratios 0.97 and 1.01, there was a tendency for the heat treatment to increase the perforator value. After the boards were stored for 6 months at 23 °C and 50% RH, the perforator values were unchanged or negligibly changed with the lower mole ratios and there was a more pronounced change with a higher mole ratio of 1.27.     

Study of the high purity and ultrafine silica fibre

The effects of leaching time, temperature and the concentration of the acid solution on the purity of the drawn sodium borosilicate glass fibres were systematically studied. The high purity and ultrafine silica fibres were obtained by acid leaching method. The law of leaching non-siliceous constituents was found. Furthermore, leaching mechanism is discussed, which can be considered as a process of ion exchange and diffusion.     

基于云理论和元胞自动机理论的城市配电网空间负荷预测

针对城市电网规划中电力负荷空间分布和时间动态演化预测难题,提出一种采用元胞自动机(cellular automata,CA)模拟城市土地利用的逐年发展过程进而进行城市配电网空间负荷预测方法。该方法基于云模型的知识,将影响因素的定性概念所具有的模糊性、随机性有机地结合在一起,构成定性和定量间的相互映射。综合考虑多种影响负荷发展的因素,运用云理论训练CA转换规则,制定多种转换规则来预测规划区域地块的发展程度。通过应用所提模型和方法对某规划小区负荷发展进行预测及实际对比,验证了其有效性。     

项目融资租赁与BT项目融资模式的比较及风险控制探析

项目融资租赁是融资租赁与项目融资相结合的一种创新融资模式,目前其在基础设施项目建设融资中的应用尚处于研究和探索阶段。通过与BT项目融资进行对比,详细论述了项目融资租赁的基本概念、特征和操作模式,指出了其主要风险及应对措施,提出了项目融资租赁的实施建议,以此来推动项目融资租赁在基础设施项目建设融资中的应用。     

冷却方式对磁铁矿冷却产物的磁性影响研究

磁化焙烧工艺已成为处理难选铁矿资源的主要手段,焙烧产品冷却方式是影响磁化焙烧产品选别指标的重要因素。以海南某赤铁矿纯矿物为研究对象,考察了其磁化焙烧后惰性气氛、水淬冷却和空气气氛冷却方式对焙烧产品磁铁矿氧化程度的影响。结果表明：惰性气氛可以有效防止磁铁矿发生氧化反应,产品单位质量磁矩最大,为74.2 A?m2/kg;水淬冷却过程中发生轻微的氧化反应,产品单位质量磁矩为72.5 A?m2/kg;而空气冷却方式下,磁铁矿冷却过程中部分氧化为赤铁矿,焙烧产物的单位质量磁矩仅为37.6 A?m2/kg。空气气氛冷却受冷却初始温度影响较大,随着冷却初始温度的降低,冷却产物FeO含量逐渐增加,单位质量磁矩逐渐增加,比磁化系数逐渐增加。试验结果可以为难选铁矿石磁化焙烧过程优化提供参考。     

工业挥发性有机污染物控制与资源化利用

综述了多种不同的工业挥发性有机污染物(VOCs)控制技术,从工程应用角度分析了其适用范围、优缺点、应用现状和研究方向等。在此基础上,针对目前工业VOCs控制过程存在的低浓度大风量VOCs处理问题、复杂VOCs废气体系处理问题及单一控制方法治理效率低等问题,提出对现有工艺技术设备的优化建议、不同处理方式集成组合、源头治理等改进手段,从宏观角度探讨了VOCs资源化的社会发展需求及解决方案。