51单片机是对所有兼容Intel 8031指令系统的单片机的统称,是一种带闪烁可编程可擦除只读存储器(FPEROM—Falsh Programmable and Erasable Read Only Memory)的低电压,高性能CMOS8位微处理器。其代表型号是ATMEL公司的AT89系列,它广泛...51单片机是对所有兼容Intel 8031指令系统的单片机的统称,是一种带闪烁可编程可擦除只读存储器(FPEROM—Falsh Programmable and Erasable Read Only Memory)的低电压,高性能CMOS8位微处理器。其代表型号是ATMEL公司的AT89系列,它广泛应用于工业测控系统之中。很多公司都有51系列的兼容机型推出,今后很长的一段时间内将占有大量市场。传统电气设备采用的各种控制信号,必须转换到与单片机输入接口相匹配的数字信号。用户设备须输入到单片机的各种控制信号,该文阐述的是PNP型传感器输出的开关量,通过输入电路转换成单片机能够接收和处理的信号。展开更多
The safety and toxicity of chemicals given first to animals and finally to humans are generally estimated with a method of safe coefficient, which is scientifically a way lack of grounds. To make a change of the old m...The safety and toxicity of chemicals given first to animals and finally to humans are generally estimated with a method of safe coefficient, which is scientifically a way lack of grounds. To make a change of the old method, we designed a Physiologically Based Pharmacokinetics Medel for the estimate of safety and toxicity of chemicais. As an example,p-nitrophenol sodium (PNP-Na) is used in the research work. Studies of the PNP-Na pharmacokinetics in bodies of rat as well as humans are made, and possibilities of making use of the Model in the estimate of safety and toxicity of chemicals are discussed.展开更多
文摘51单片机是对所有兼容Intel 8031指令系统的单片机的统称,是一种带闪烁可编程可擦除只读存储器(FPEROM—Falsh Programmable and Erasable Read Only Memory)的低电压,高性能CMOS8位微处理器。其代表型号是ATMEL公司的AT89系列,它广泛应用于工业测控系统之中。很多公司都有51系列的兼容机型推出,今后很长的一段时间内将占有大量市场。传统电气设备采用的各种控制信号,必须转换到与单片机输入接口相匹配的数字信号。用户设备须输入到单片机的各种控制信号,该文阐述的是PNP型传感器输出的开关量,通过输入电路转换成单片机能够接收和处理的信号。
文摘The safety and toxicity of chemicals given first to animals and finally to humans are generally estimated with a method of safe coefficient, which is scientifically a way lack of grounds. To make a change of the old method, we designed a Physiologically Based Pharmacokinetics Medel for the estimate of safety and toxicity of chemicais. As an example,p-nitrophenol sodium (PNP-Na) is used in the research work. Studies of the PNP-Na pharmacokinetics in bodies of rat as well as humans are made, and possibilities of making use of the Model in the estimate of safety and toxicity of chemicals are discussed.
