倒置A^2/O型一体化氧化沟工艺特点及经济性分析

结合中试工程的研究成果,评析了倒置A^2/O型一体化氧化沟工艺的特点,并探讨了在工程应用中应注意的一些问题,从投资和运行成本两个方面分析了倒置A2/O型一体化氧化沟工艺的经济性。     

某大型有色冶炼厂建筑物评估值的确定方法

为科学合理估算工程造价以确定重置成本，从而保证评估结果的客观、可靠，结合某大型有色冶炼厂的实际情况对估算工程造价的几种方法进行了分析，并对所采用的重置成本法作了具体介绍。     

INSTANTANEOUS RESPONSE OF PULVERIZED COAL PARTICLES TO FLUCTUATING TEMPERATURE IN A HOT GAS FLOW

The instantaneous temperature response of pulverized coal particles to fluctuating gas temperature in a hot airflow is investigated. The particle relaxation time for temperature is analyzed. Both numerical and analytical approaches are adopted to solve the instantaneous particle energy equation. The results obtained by the two approaches are quite close. The gas temperature fluctuation has an obvious influence on the particle instantaneous temperature, especially for particles with relatively small diameters. The effects of fluctuation intensity and frequency of the gas temperature, as well as particle Reynolds number, on the particle instantaneous temperature response are delineated. The present study provides a basis for further exploring the impacts of gas turbulence on the particle reactive behaviors.     

An analytical index for evaluating manufacturing cost and performance of low-pressure hollow fibre membrane systems

Water and waste-water treatment through the use of the membrane filtration technology is one of the processes utilized currently to meet the growing demand for water. While new technologies can harness water from various non-traditional sources such as oceans, there remains the possibility of making drinking water more expensive through the use of costly water treatment equipment. To prevent this and ensuing catastrophes in the world, the water industry needs a strategy that keeps the price of water and price of products aiding the treatment of water controlled in to the future.     

石油开发投资构成分析

按国际通行办法,就构成石油开发投入的勘探、开发、操作三大块费用做了分析并进行了类比,旨在为决策提供科学依据。     

PVC聚合装置与干燥装置DCS控制系统之间的通讯

介绍了亿利化学公司PVC聚合装置与PVC干燥装置2套不同品牌DCS控制系统之间的远程通讯的配置,以及使用效果和带来的成本节约,并进一步根据亿利化学公司目前控制系统的状况提出了将此方法扩展应用于全公司的建议。     

Interrelation of wettability–microstructure–tensile strength of lead-free Sn–Ag and Sn–Bi solder alloys

A comparative investigation on the wettability and tensile strength of a Sn–2Ag, a Sn–40Bi and the traditional eutectic Sn–Pb solder alloys was carried out. The wettability is represented by thickness of covered layer (TCL) and spread area (SA) while the mechanical behaviour by the ultimate tensile strength (UTS). It is shown that the TCL of studied alloys decreased with the increase in the dipping temperature. It is also shown that TCL and SA have opposite behaviour with respect to the cooling rate. The Sn–Bi solder alloy has lower SA when compared with those of the Sn–Ag solder when similar cooling rates are considered. The Sn–Bi solder exhibits the best UTS/SA combination for dendritic spacings between 25 and 27?µm, associated with cooling rates ～2°C?s^?1, 2× lower than those of the Sn–Ag alloy. Besides, the Sn–Bi alloy has shown SA >70～80% associated with higher UTS (～80?MPa) as compared with the other alloys examined.     

电子束辐照对白酒香气组分影响的研究

以泸州老窖1573白酒为研究对象,通过对其受到电子束辐照前后紫外吸收光谱及气相色谱的分析,研究了电子束对1573白酒香气组分的影响。结果表明,随着辐照剂量的增加,在284~300nm波段,紫外吸收光谱吸光度值呈下降趋势,此波段的相似度值也依次减小;气相色谱检测到56种香气组分,其物质含量发生变化的香气组分有41种,占总香气组分物质种类的73%。白酒中主要香气组分酯类含量整体呈下降趋势,酸类含量呈上升趋势,这与其他浓香型白酒陈酿过程中酯类、酸类物质的变化趋势保持一致,推测电子束辐照对1573白酒有一定的催陈作用。      

10 MW高温堆热气联箱气流混合模拟的相似律

１０ＭＷ高温气冷实验堆芯出口需设置热气联箱,以使氦气得到充分的热混合。使用两流体方程无量纳化分析方法导出相似准则,得到了热气联箱在缩小模型比例的系统上以常压小温差空气代替主压大温差氦气进行热工水力学模拟试验研究时应遵循的模拟准则,即几何准则、流动准则和传热准则。