固定化黄孢原毛平革菌合成木素过氧化物酶

用聚氨酯泡沫块固定黄孢原毛平革菌（Ｐｈａｎｅｒｏｃｈａｅｔｅ ｃｈｒｙｓｏｓｐｏｒｉｕｍ）,在摇瓶条件下研究了合成木素过氧化物酶的特点和重要影响因素。固定化培养与游离菌线球培养相比,最高酶活提高６４％．固定化细胞重复利用４批仍保持较高的产酶活性。高剪应力对酶活有抑制作用。苯甲醇可以代替藜芦醇强化木素过氧化物酶的合成,其最佳浓度为５．２ｍＭ。利用自制的相相流化床反应器进行了间歇产酶试验,发现最佳通气     

On a eulerian and lagrangian combined model in dense particle-laden riser flow

A new numerical model using both Eulerian and Lagrangian coordinates, and taking account of interparticle interactions, has been developed for the study of hydrodynamic aspects of dense particle-laden rise flows. A stochastic particle dispersion model has been incorporated in the original model to describe the gas particle turbulent flows. In addition, the collisional interaction between the particles has been modeled using the kinetic theory of granular flows based on the Chapman-Enskog theory of dense gases. A comparison with the experimental results of Miller and Gidspow (1992) shows reasonably good agreement. The present model may provide a useful approach for predicting the complex hydrodynamic behaviour of fluidized bed systems.     

基于Modelica/Dymola的小型燃气轮机建模与仿真

为了研究小型燃气轮机在不同环境下的动态特性,采用模块化建模方法,并根据质量和能量守恒原理,对小型燃气轮机进行了合理划分,建立了压气机、燃烧室、透平等单元部件的数学模型,并将这些部件划分为容积模块和流动模块.采用面向对象的、多领域的物理系统建模语言Modelica和Dymola编译器编制了各部件的仿真程序,建立了SmallGasTurbine通用模型库,以方便不同结构系统的小型燃气轮机的模型搭建.以川崎M1A-13D、M7A-01小型燃气轮机为例,搭建了它们的系统模型,将厂家给定基本数据与仿真结果进行了对比.研究结果表明,小型燃气轮机模型模拟仿真误差较小,具有很高的精确度.     

基于BP神经网络的液滴图像识别方法

通过CCD监测白酒和掺入50％水的白酒两种不同液体液滴的生长过程,针对最大的液滴提取特征参数,利用主成分分析技术对特征参数进行优化,确定了5项有效的特征参数。最后采用BP神经网络识别不同的液滴。结果表明：不同液体液滴的轮廓特征参数是有区别的。因此,结合模式识别的图像液滴分析技术可以应用于分析和鉴别液体。     

浅谈实验室管理体系文件化的新方式

文件化的管理体系是实验室按照相关标准和准则有效运行的纲领和证据,然而随着实验室信息管理系统(LIMS)的飞速发展和广泛应用,传统的质量手册、程序文件和记录表格等文件化的管理体系方式也伴随着新的信息管理体系模式发生新的变化。认可与检验检测行业实验室管理体系文件化方式的进行探索,并由此对未来实验室管理体系文件化的发展提出建议。     

CCHP系统综合评价指标体系的信度与效度验证

基于冷热电联供(CCHP)系统初始综合评价指标体系,结合算例,对不同配置方案下初始综合评价指标体系进行信度与效度验证,获得了CCHP系统综合评价指标体系。     

“流空间”视角下的新型城镇化研究

通过剖析珠三角自改革开放以来的城镇化历程可知,珠三角城镇化是具有"流空间"特征的就地城镇化,而当前珠三角城镇规划无论是规划体系,还是规划编制,都是以"场空间"为导向的,这种规划导向与发展特征之间的不适应性,会带来一系列问题。随着区域城镇化的推进,大都市区域(城镇连绵区)将会成为未来的发展热点;在这种区域大背景下界定"流空间"体系的内涵。相比传统规划视角,"流空间"理论能更好地解释珠三角城镇化的过去;故此,基于"流空间"的视角来分析、预测新型城镇化的发展趋势,为新时期的城镇规划提供参考。     

某鲕状赤铁矿循环流化床焙烧-磁选试验研究

采用实验室循环流化床装置,以CO与N2的混合气体和电加热方式模拟燃煤还原焙烧气氛,对铁品位为47.20%的鄂西某鲕状赤铁矿进行磁化焙烧-弱磁选试验,结果表明,在合适的焙烧温度、焙烧时间、焙烧气氛、气体流量、磁场强度及-325目占80%的最终磨矿细度下,经过循环流化床焙烧-阶段磨矿-一粗一精两段弱磁选,可获得精矿铁品位为56.60%,对焙烧矿铁回收率为77.79 %的较好选别指标。     

Experimental study of improved two step synthesis for DME production

Dimethyl ether (DME) has received growing attention due to its potential use as a multi-purpose fuel. A new technical route of improved two step synthesis is proposed for DME production, which is composed of methanol synthesis and methanol dehydration in a fixed-bed reactor. The influences of the operating conditions including reaction pressure, temperature, H₂/CO mole ratio in the syngas and space velocity on CO conversion, selectivity and yield of DME are investigated. CO conversion and DME yield both increase monotonically with the pressure increase. The optimal reaction temperatures for the synthesis and dehydration of methanol are different. CO conversion increases at first and keeps constant when the H₂/CO mole ratio is above 2. DME yield increases obviously and then decreases gradually with the space velocity increase. The optimal conditions are obtained to maximize the CO conversion and DME selectivity. The reaction temperatures of the top and bottom stage are in the range of 270-280 °C and 235-245 °C, respectively. The optimal ratio of H₂/CO is above 2, and the space velocity is in the range of 1000-1300 h^− 1.     

Filtration combustion characteristics of low calorific gas in SiC foams

This study investigated the combustion characteristics of low calorific gas in silicon carbide (SiC) foam. The temperature distribution, reaction zone, maximum temperature, and combustion wave propagation velocity were analysed at different inlet velocities, equivalence ratios of premixed gases, and pore densities. The temperature distribution near the reaction zone was determined by a time-based method. Super-adiabatic combustion was obtained in porous media under different conditions. The experimental results showed that higher temperatures were obtained in SiC foams of 30 pores per inch (PPI) than those measured for foam of 20 PPI. Increased equivalence ratio of premixed gases and pore density led to a thicker reaction zone and a higher preheating efficiency in the preheating zone. The combustion wave propagation velocity, which was less than 2 mm/s under these experimental conditions, was increased with increased inlet velocity and decreased equivalence ratio of premixed gases. The combustion wave propagation in foams of 20 PPI had the lowest velocity because of the good match of convection and radiation.