In this paper,the effects of four sorts of silica with the particle size range of 4～10μm on coated paper properties and printing performance were studied.The results showed that the smaller particle size silica can ...In this paper,the effects of four sorts of silica with the particle size range of 4～10μm on coated paper properties and printing performance were studied.The results showed that the smaller particle size silica can provide the coated paper with higher density and contrast, better definition and good printing performance.展开更多
为克服航海日志和纸海图进行船舶航迹记录的缺点,本文基于STC89C58芯片设计一种经济实用的小型GPS船舶航迹仪,能够完整、准确的记录船舶的大量航行数据,且具有船舶航行必备的导航功能。该航迹仪主要由STC89C58单片机、GPS模块、存储器、...为克服航海日志和纸海图进行船舶航迹记录的缺点,本文基于STC89C58芯片设计一种经济实用的小型GPS船舶航迹仪,能够完整、准确的记录船舶的大量航行数据,且具有船舶航行必备的导航功能。该航迹仪主要由STC89C58单片机、GPS模块、存储器、TFT彩屏显示模块、串口通信接口、按键模块和电源模块组成,以Gstar-GS-15C作为GPS数据信息接收器。硬件系统的总功耗仅为85 m A,所测船舶经度和纬度数据标准偏差分别小于0.03 s和0.136 s。经调试,本文所设计的航迹仪在功能和测量精度上均满足使用要求。展开更多
文摘In this paper,the effects of four sorts of silica with the particle size range of 4～10μm on coated paper properties and printing performance were studied.The results showed that the smaller particle size silica can provide the coated paper with higher density and contrast, better definition and good printing performance.
文摘为克服航海日志和纸海图进行船舶航迹记录的缺点,本文基于STC89C58芯片设计一种经济实用的小型GPS船舶航迹仪,能够完整、准确的记录船舶的大量航行数据,且具有船舶航行必备的导航功能。该航迹仪主要由STC89C58单片机、GPS模块、存储器、TFT彩屏显示模块、串口通信接口、按键模块和电源模块组成,以Gstar-GS-15C作为GPS数据信息接收器。硬件系统的总功耗仅为85 m A,所测船舶经度和纬度数据标准偏差分别小于0.03 s和0.136 s。经调试,本文所设计的航迹仪在功能和测量精度上均满足使用要求。
