Study of the net shape diffusion welding mechanism of aluminum matrix composite SiCw/6061Al

Bonding zone behavior of aluminum matrix composite SiC_w /6061Al, containing that of matrix-matrix, matrix-enforcement, enforcement-enforcement, was studied in this paper. It is found that there is a 'critical temperature' in the temperature liquid/solid two-phase regime of aluminum matrix composites. When the welding temperature reaches this critical temperature, a certain amount of liquid matrix metal appears in the bonding area, which not only leads to the perfect bonding of the matrix-matrix (M/M) and reinforcement-matrix (R/M) interface, but also changes the reinforcement-reinforcement (R/R) interface to a reinforcement- matrix-reinforcement (R-M-R) interface. Processing at this temperature leads to a high-strength joint. At the same time, by controlling welding pressure between the solidus and liquidus temperature of aluminum matrix composites, the net shape joint of aluminum matrix composites is attained. The deformation of welding joint is controlled to less than 1%, so the net shape bonding of aluminum matrix composites is achieved.     

基于51单片机的空气净化机的设计

介绍了基于51单片机的空气净化机的基本结构,以及各部分硬件功能。通过硬、软件两方面的设计,实现了该空气净化机。给出了系统硬件结构框图、软件流程图。该空气净化机具有功耗低、体积小、噪声低等优点。     

光治疗仪液晶显示模块的设计和控制

根据工业应用的要求,结合Silicon的微控制器C8051F310,介绍了一种应用于光治疗仪的定制式液晶模块VT066的设计及驱动控制,详细阐述了显示系统的硬件构成和软件设计,给出了硬件接口框图和软件流程图。该液晶显示模块具有性能稳定、界面友好、显示内容丰富且占用I/O口较少等优点。     

高功率多注速调管TM310模圆柱形谐振腔杂模抑制方法

该文针对TM₃₁₀模(主模)圆柱形谐振腔提出了一种新的杂模抑制方法。为抑制与主模相邻的低次杂模TM₀₂₀,采用在谐振腔中放置接收振子天线的方法,并推导了放入接收振子天线后,模式频率变化量的表达式。由此发现：模式频率变化量仅依赖于该模式在接收振子天线处的电场强度,而与其磁场无关;通过适当调整接收振子的位置,可使主模和TM₀₂₀ 模具有不同的频率变化量,从而能增大模式之间的频率间隔,避免TM₀₂₀ 模对主模的干扰。另外,为抑制与主模相邻的杂模TM⁺₃₁₀,采用了在谐振腔中放置短路杆阵的方法。利用CST-MWS软件对X波段此类谐振腔进行了模拟计算,验证了该方法的有效性。     

基于C8051F310和CS8900A的计算机网络实验平台设计

分析了嵌入式计算机网络实验平台设计原理,给出了大学计算机与通信等相关专业《计算机网络》课程实验平台的硬件和软件设计方法,同时介绍了C8051F310单片机和以太网控制芯片CS8900A的基本特性和工作原理。     

基于C8051F310和CS5460A的电压电流表设计

为了解决传统机械式电压电流测量方法抗干扰能力差、集成化程度低的缺陷,文中给出了基于单片机C8051F310和专用电能计量芯片CS5460A来设计新型智能化电压电流表,同时将电压电流值通过LED显示出来的具体方法。给出了设计该系统的硬件原理图、软件流程图及试验结果。     

机组控制联锁系统完善与应用

本文主要对中油大港石化分公司160万吨/年富气压缩机的调速控制系统改造后的调速动作逻辑、操作方法、维护和使用进行了重点阐述,并简单介绍了TS3000调速控制的组成、原理和使用维护。     

微型PSA制氧机电池智能管理系统设计

为微型PSA制氧机电池设计一种智能管理系统,以C8051F310为控制核心,结合锂电池充电保护芯片CN3704和电池监测芯片DS2438,对锂电池充放电进行保护并对其状态进行在线监测。该系统实现了对锂电池过充、过放、过流和短路的保护,并具有实时显示状态信息和报警提示的功能。电池智能管理系统电路简单、稳定性好、可靠性高,提高了充电安全性,延长了电池使用寿命,为微型PSA制氧机的稳定运行提供了可靠的电源保证。     

Application of mercury porosimetry to the study of xerogels used as stone consolidants

Alkoxysilanes, low-viscosity monomers that polymerize into the porous network of stone by a sol-gel process, are widely used in the restoration of stone buildings. We have used the mercury porosimetry technique to characterize changes in microstructure of three granites following their consolidation with two popular commercial products (Wacker OH and Tegovakon V). The suitability of this technique is questioned because a surprising increase of stone porosity is observed. In order to investigate the feasibility of porosimetry, we analyze the behavior of xerogels prepared from the two commercial products, under mercury pressure. Gels are basically compacted and not intruded by mercury. Thus, the increase of stone porosity after consolidation can actually be associated with gel shrinkage. Mercury porosimetry, therefore, has been found unsuitable for characterizing the microstructure of consolidated rocks. However, it can be employed usefully to evaluate shrinkage of gels under mercury pressure, which permits the behavior of a consolidant during the process of drying in stone to be predicted. It is a key factor because many problems of consolidants are related to their drying process within the stone. Gels under study exhibit a high rigidity and an elastic behavior, as consequence of their microporous structure. Finally, the reduction in the porous volume of gels after the porosimetry test demonstrates that the shrinkage mechanism is based on pore collapse.     

用SAA7111A设计模拟视频转换接口

介绍了SAA7111A和AL251的特点，功能，原理以及在模拟转换接口中的应用，并给出了硬件连接电路示意图。