DZ—1型CMOS液晶显示数字钟

现代的计时装置都是朝着数字显示式方向发展,这是因为数字显示式完全摆脱了时钟齿轮传动的复杂机械结构。而直接用数字显示出来。由于低功耗CMOS集成电路和微功耗液晶显示器件的应用,又可以做成功耗低、体积小、重量轻,特别是显示清晰和走时精度高等优点的数字显示式计时装置,使其具有广泛的用途,尤其适用便携式仪器上的计时装置。     

一种新的短周期地震记录仪放大器

放大器是测震仪的一个关键部件,它由前置放大和功率放大两级组成.前置放大主要担负放大由拾震器输出的微弱地动信号是电压放大。功率放大主要是输出功率,即将放大了的信号转换为功率输出去推动记录笔记录出与地动位移成正比例的地震波形。因记录笔是线性记录笔,而拾震器输出的地震信号则是微分信号。为了实现将微分信号变为线性信号以适合于线性记录笔记录波形,所以要求放大器必须是积分式型的放大器。     

新型地震记录仪计时器—电子手表数字钟

本文主要介绍用液晶显示电子手表来研制地震记录仪的计时装置和机械传动机构的动力信号源。因地震记录仪要求工作环境温度宽,时间精度高,所以,一般的电子手表若被简单地应用,是难以满足地震仪器的技术指标要求的。为此,另外研制一种频率稳定度比较高的1048.576KC的温度补偿晶体振荡器来取代电子手表中频率稳定度比较低的32.768KC晶体振荡器,并保持其原有IC集成度高、线路简单、体积小、功耗低等优点。同时,为了提高计时精度,消除钟的积累误差,还设有自动对时装置,供与授时台校准标准时间,从而使其各项技术指标均达到满足要求之目的。     

用VB实现报文监控功能

介绍了Visual Basic语言的主要特点和监控软件的编写原理,详细说明了用Visual Basic语言实现监控软件功能的核心步骤和报文监控软件报警后的几种处理方法.     

背景气候和城市化对中国东南部增温的联合效应(英文)

Based on China homogenized land surface air temperature and the National Centers for Environmental Prediction/Department of Energy (NCEP/DOE) Atmospheric Model Intercomparison Project (AMIP)-Ⅱ Reanalysis data (R-2), the main contributors to surface air temperature increase in Southeast China were investigated by comparing trends of urban and rural temperature series, as well as observed and R-2 data, covering two periods of 1954-2005 and 1979-2005. Results from urban-rural comparison indicate that urban heat island (UHI) effects on regional annual and autumn minimum temperature increases account for 10.5% and 12.0% since 1954, but with smaller warming attribution of 6.2% and 10.6% since 1979. The results by comparing observations with R-2 surface temperature data suggest that land use change accounts for 32.9% and 28.8% in regional annual and autumn minimum temperature increases since 1979. Accordingly, the influence of land use change on regional temperature increase in Southeast China is much more noticeable during the last 30 years. However, it indicates that UHI effect, overwhelmed by the warming change of background climate, does not play a significant role in regional warming over Southeast China during the last 50 years.