Based on the basic requirements and function of the displacement - load sensor , the design adopts single - chip 8 - bit microcontroller - p89c51rc2 manufactured in an advanced cmos process and belonged to the 80c51 microcontroller family to make the p89c51rc2 ’ s circuit less , simple and more reliable 根据位移-载荷传感器功能和主要技术指标要求,采用高性能静态80c51设计的,带有非易失性flash的8位微处理器p89c51rc2作为传感器的核心控制器。
That the common amplifier count rate is low , temperature voltage drift is very good , the machinery adjustment is rough and instability , in order to overcome these shortcomings ; we use digital potentiometer relay x9511 and precise operational amplifier op37 , the electric circuit structure become simple 为了克服一般放大器计数率低,温漂大,机械调节粗糙不够稳定等缺点,使用了非易失性数字电位器x9511和精密运放op37 ,使电路结构大大简化。
In general , volatile resource managers manage volatile resources such as an in - memory data structure for example , an in - memory transacted - hashtable , and durable resource managers manage resources that have a more persistent backing store for example , a database whose backing store is disk 通常，易失性资源管理器管理内存中数据结构之类的易失性资源（例如，内存中事务处理哈希表） ，而持久性资源管理器管理具有更持久后备存储器的资源（例如，其后备存储器为磁盘的数据库） 。
We can obtain the information that we indeed want less we analyze and mine a lot of data . then , this paper discuss that in order to satisfy decision - making , on the base of data - base , a new data warehouse that can meet the decision - making is built . data warehouse has these important characteristics : subject - oriented , data integration , data changing , data non - disappearing , data gathering and decision - making 然后，本文讨论了为满足管理的决策分析需要，在数据库基础上产生了能够满足决策分析所需要的数据环境? ?数据仓库数据仓库具有这样一些重要的特性：面向主题性、数据集成性、数据的时变性、数据的非易失性、数据的集合性和支持决策作用。
