Solubility of Disperse Red 82 and modified Disperse Yellow 119 in supercritical carbon dioxide or nitrous oxide with ethanol as a cosolvent

Ethanol was used as a cosolvent to enhance the solubility of disperse dyestuffs in supercritical fluids. In the presence of ethanol, from (1 to 5) mol%, the gas–solid equilibrium data of the Disperse Red 82 and modified Disperse Yellow 119 in supercritical carbon dioxide or nitrous oxide have been measured at temperatures from (353.2 to 393.2) K and pressures from (15.0 to 30.0) MPa. The experimental results show that the solubility increases substantially, up to (9 to 25)-fold, by adding 5 mol% of ethanol to the supercritical fluids. In the presence of cosolvent ethanol, the solubility enhancements in nitrous oxide system are much greater than that in carbon dioxide system for modified Disperse Yellow 119 at the same temperature and pressure. The solubility data were correlated with the Chrastil and the Méndez-Santiago and Teja models. The Méndez-Santiago and Teja model yields slightly better results than Chrastil model.     

一种基于单片机及CPLD测试平台的设计与实现

文章介绍可编程计数器/定时器M82C54和高速异步双端口RAM IDT7130的性能特性.利用单片机80C196KB及上述芯片设计并实现测试平台,给出测试平台的接口电路,并阐述了它的实现原理.     

SIEMENS 840D数控系统钻孔循环的研究

针对UG、MASTERCAM、CAxA等诸多CAM软件的后处理无法生成SIEMENS 840D可执行的钻孔循环,通过对SIEMENS 840D标准循环的研究,找到了一种方法,并成功地解决了SIEMENS840D钻孔循环参数设定的方法与意义.文章详细的讲述了SIEMENS 840D数控系统中,钻孔循环cycle81、cycle82以及cycle83中各个参数设定的意义和应用方法.     

基于AD2S82A的多通道测角系统及与DSP的接口设计

利用轴角-数字转换芯片AD2S82A和旋转变压器,可以组成高精度的多通道测角系统。介绍了这种测角系统的组成和工作原理,研究了它与DSP处理器的接口问题,并利用三态锁存器和单脉冲触发芯片,设计出了一种适用于多通道系统的高速接口电路,解决了DSP一次读取多片AD2S82A所造成的大量时间延迟问题。     

浸入式水口对82B钢方坯渣沟缺陷的影响

 为了解决82B钢连铸坯表面出现渣沟的问题,以提高钢渣界面温度、改善保护渣的熔化与润滑效果为出发点,对连铸现场180 mm×180 mm小方坯结晶器建立三维数学模型,对比施加电磁搅拌工艺不同直通型浸入式水口下结晶器内流场和温度场分布。计算结果表明,当水口内/外径由40/100 mm变为30/70 mm后,水口两侧流速大于0.15 m/s的流场区域扩大,水平截面环流最大流速由0.44 m/s降低至0.42 m/s,这表明流股对四周壁面的冲刷作用减弱;钢液面最大流速由0.12 m/s增大至0.15 m/s,高温区域范围扩大。综合效果显示,水口内外径减小对结晶器内的流场影响较小,钢渣界面附近钢液温度提高。现场试验统计表明,水口内外径减小后,保护渣消耗量由吨钢0.189 kg提高到0.228 kg,钢液面处保护渣的熔化良好,润滑效果得到了改善。配合保护渣优化等措施,铸坯表面渣沟发生率明显下降,由改进前的40%~50%降低到改进后的1%以内。     

82B�������ܲ��ϸ�ԭ�����

 通过对82B盘条试样的理化分析，发现试样中心高碳、存在脆性相 网状渗碳体是造成82B力学性能不合格的主要原因，而中心高碳的根本原因是连铸坯存在严重的中心偏析。     

数控机床螺纹加工的编程特点

数控加工螺纹要解决的两个重要问题是：切削螺纹裕量的计算和进刀量的选择，本文详细介绍了螺纹裕量的计算方法和进刀量的选择依据，并提供了有关的运算公式和图表，通过举例编程，说明各参数的运用和各螺纹指令的编程方法，并介绍了加工螺纹时应注意的问题。     

Complex dynamics and empirical evidence

Standard macroeconomics, based on a reductionist approach centered on the representative agent, is badly equipped to explain the empirical evidence where heterogeneity and industrial dynamics are the rule. In this paper we show that a simple agent-based model of heterogeneous financially fragile agents is able to replicate a large number of scaling type stylized facts with a remarkable degree of statistical precision.     

Experimental kinetic study of the oxidation of p-xylene in a JSR and comprehensive detailed chemical kinetic modeling

The oxidation of para-xylene was studied in a jet-stirred reactor at atmospheric pressure under dilute conditions. New experimental results were obtained over the high-temperature range 900-1300 K, and variable equivalence ratios (0.5?Φ?1.5). They consisted of concentration profiles of the reactants, stable intermediates, and final products, measured by sonic probe sampling followed by on-line GC-MS and off-line GC-TCD-FID and GC-MS analyses. The oxidation of para-xylene under these conditions was modeled using a detailed chemical kinetic reaction mechanism (160 species and 1175 reactions, most of them reversible) deriving from a previous scheme proposed for the ignition, oxidation, and combustion of simple aromatics (benzene, toluene, styrene, n-propylbenzene). The proposed kinetic scheme was also successfully tested against the ignition delays of p-xylene-oxygen-argon mixtures, and the combustion of p-xylene in a low-pressure methane-oxygen-nitrogen flame doped with p-xylene, confirming its validity. Sensitivity analyses and reaction path analyses, based on rates of reaction, were used to interpret the results.     

SWRH82B硬线尖状断口研究

针对用户使用当中存在的SWRH82B硬线尖状断口缺陷进行了专题研究。分析尖状断口形貌及特征。找出尖状断口产生的原因。提出消除该缺陷的措施与办法．