改性聚苯胺膜在CO_2/CH_4分离中的应用研究

合成了一种由N-乙基苯胺和苯胺共聚的高聚物,并制备了其4种掺杂态共聚物膜。实验中在不同压力、不同进料组成下测试了共聚物膜及聚砜膜对CO2/CH4混合气的分离性能。实验结果表明:掺杂态不同对气体的分离性能有很大影响,其中二次掺杂态的分离系数最高,可达70,而去掺杂态的渗透速率最高,CO2可达2.15 GPU[1 GPU=7.501×10-10cm3/(cm2.s.Pa)],CH4达到0.049 GPU,均高于聚砜膜和文献中报道的聚苯胺膜的值,这是由于N-乙基的引入,改变了聚合物链的柔韧性。     

基于PCI总线的数码管现场显示控制卡设计

PCI总线是先进的高性能32/64位局部总线,易于实现高速实时的I/O口控制卡、通信接口卡。论文设计了一种基于CH365芯片的PCI总线控制卡,主要包括PCI接口芯片、单片机以及数据缓存单元;同时设计了基于数码管驱动芯片CH451的显示电路板,CH451并联应用,连接单片机控制信号,占用较少单片机引脚即可实现多路数据的显示。实验验证了基于PCI总线控制数码管现场显示的可行性。     

Stainless steel membrane distributor-type dielectric barrier discharge plasma reactor for co-conversion of CH4/CO2

Flow arrangement in a dielectric barrier discharge (DBD) plasma reactor is key to affecting multi-component gas reactions. Herein, a stainless-steel membrane distributor-type DBD reactor was developed to allow the change of gas flow arrangements freely to understand their effect on plasma-assisted CH₄/CO₂ co-conversion to syngas. Variation of gas flow arrangements in the DBD reactor could regulate the reaction performance. Also, the inclusion of quartz wool in the DBD reactor could enhance the effect of gas flow arrangement compared to the plasma-alone DBD. Especially, the DBD reactor with CO₂ feed in the quartz wool-packed discharge zone and CH₄ distributed via the membrane exhibited good stability over 600 min on stream, with rather stable CO₂/CH₄ conversions of ~25%/20%, H₂/CO selectivities of ~50%/32%, H₂/CO molar ratio of 0.9–1.1, and energy efficiency of ~0.20 mmol·kJ⁻¹ based on the conversion of feed gases.     

基于 CH376实现 TMS320 LF240 x片内Flash在线编程

详细介绍利用CH376芯片实现在线编程的软硬件设计,给出通过CH376实现文件查找和文件数据块读取的详细流程,bin文件的转换方法以及在线编程的流程。该设计成功应用于系统开发中,给系统升级维护提供了诸多便利,减少因系统升级维护导致的产品召回。     

基于AT89C52的便携式甲醛检测仪设计

为了能够准确测量室内和一些特殊环境甲醛浓度,以单片机AT89C52为主控核心,采用电化学CH2O甲醛传感器为数据采集模块,设计了一种用于室内及一些特殊环境中甲醛浓度检测装置。     

CH40型钢的研制

CH40型钢为内卷边槽钢。生产厂家要求在现有φ89高频直缝焊管机组上完成生产任务。依据机组的结构特点,为其完成机组改造及整套孔型设计,给出孔型变形图。     

Effect of cation exchange capacity of soil on stabilized soil strength

While a certain correlation between the cation exchange capacity (CEC) of the soil and the strength of the cement stabilized soil has been reported, the mechanism remains unclear. In this research, a set of soil samples with different CECs were stabilized with different proportions of cement and calcium hydroxide (Ca(OH)₂, CH). The influence of soil CEC on the strength of the stabilized soil was investigated by analyzing the CH saturation in the pore solution and measuring the strength of the stabilized soil specimens. It is revealed that cation exchange in the soil can reduce the CH saturation of the stabilized soil. If the CEC of the soil is too high, the CH in the pore solution of the stabilized soil cannot reach the saturation level, and further cation exchange would then consume the Ca²⁺ ions which should be originally used to generate calcium silicate hydrate, thus result in the poor strength of the stabilized soil.     

USB接口用户专用键盘快速检测模块的设计与实现

针对USB接口用户专用键盘,设计了以51系列单片机和USB主机控制器芯片CH375为核心的快速检测模块,以实现专用键盘的快速检测。文章介绍了CH375芯片的工作原理、探讨了HID类规范,重点介绍了模块的硬件原理和软件流程。使用该模块进行用户专用键盘地调试、检测,取得了比较满意的效果。     

基于VB和CH374的温度测量系统设计

为了满足实时性和便携性的要求,开发了基于USB总线技术的多通道温度测量系统.利用CH374 USB总线接口芯片和MC9S12DG128单片机完成数据采集单元与PC机之间的通信.测控软件基于Visual Basic 6.0语言,包含SQL、OLE、DLL、Windows API、ActiveX等多项技术,可实现数据显示、列表刷新、曲线绘制、文件存储和参数设置等功能.测试结果表明:该系统界面友好,可视化程度高,具有很强的实时性和可靠性.