排序方式: 共有11条查询结果,搜索用时 15 毫秒
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静加载测力仪是与铁道部科学研究院静强度实验室的合作项目,该设备直接用于铁路上相关零件的静加载力值检验,具有精度高的特点。本文介绍了该设备的工作原理,硬件设计,软件设计以及调试过程中遇到的一些问题及相关的解决办法。 相似文献
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HGTMS 板卡需要用到多个复杂芯片,而每个芯片都有具体的上电时序。本文根据各上电时序要求,使用
EPLD POWR1220AT8 控制各电源上电时序和电压值监控,从而保障板卡可以正常启动。本设计具有普遍性,在各种板卡设
计中都可以使用。 相似文献
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高精度数模转换器通常采用过采样技术,本文分析了DAC1220∑-△技术的基本工作原理,讨论了模拟操作,数字操作,接口控制等方面的具体操作方法,并结合具体应用DAC1220与TMS302F206的接口方法和具体程序。 相似文献
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介绍了符合Zigbee协议的无线加速度传感器节点及其ARM基站的结构.无线加速度传感器节点由STC单片机、CC2420无线通信模块、TLC2543 A/D转换模块组成;ARM基站由S3C4480X微处理器系统、CC2420无线通信模块等组成.并介绍了加速度传感器MMA1220和CC2420的工作原理及其构成的无线测控系统中的节点与基站的软硬件设计方法. 相似文献
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The allotropes of carbon nanomaterials (carbon nanotubes, graphene) are the most unique and promising substances of the last decade. Due to their nanoscale diameter and high aspect ratio, a small amount of these nanomaterials can produce a dramatic improvement in the properties of their composite materials. Although carbon nanotubes (CNTs) and graphene exhibit numerous extraordinary properties, their reported commercialization is still limited due to their bundle and layer forming behavior. Functionalization of CNTs and graphene is essential for achieving their outstanding mechanical, electrical and biological functions and enhancing their dispersion in polymer matrices. A considerable portion of the recent publications on CNTs and graphene have focused on enhancing their dispersion and solubilization using covalent and non-covalent functionalization methods. This review article collectively introduces a variety of reactions (e.g. click chemistry, radical polymerization, electrochemical polymerization, dendritic polymers, block copolymers, etc.) for functionalization of CNTs and graphene and fabrication of their polymer nanocomposites. A critical comparison between CNTs and graphene has focused on the significance of different functionalization approaches on their composite properties. In particular, the mechanical, electrical, and thermal behaviors of functionalized nanomaterials as well as their importance in the preparation of advanced hybrid materials for structures, solar cells, fuel cells, supercapacitors, drug delivery, etc. have been discussed thoroughly. 相似文献
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胡雪岗 《仪器仪表标准化与计量》2007,(1):46-48
DAC1220是采用△-∑转换技术实现的20位D/A转换器,具有噪声低、线性误差小、温漂小等特点,可用串行接口进行3线操作,很适合于灵敏的基于微控制器和DSP的系统。本文简明扼要的介绍了DAC1220芯片的原理和应用。 相似文献