长时间

A dynamic monitoring and identifying system of Fe2O3 series gas sensors for the research of electronic nose is introduced. The system has 6 channels to input 0~2.5V voltage signals, measures system temperature, makes thermoregulation for sensor with hardware and has LCD screen and voice function. The heating circuit using TL494 chip and PWM mode is realized. Offline and online identification is realized. The hardware design is based on 16 bits MSP430F149 microcontroller. The software design for digital acquisition and identification based on Windows operating system is compiled by Visual Basic 6.0. The test results show that friendly interface, simple operation, accurate data, reliability and stability are obtained. The real-time monitoring for all of the sensors in aerometry or identification can be realized by BP ANN.

介绍了一种用于电子鼻研究的Fe2O3系列气敏传感器阵列动态测试、控制和识别系统；该系统能够同时采集6路0~2.5V的模拟电压信号，测量系统温度、硬件对传感器进行温度补偿，同时具有液晶显示和语音功能；加热电路用TL494芯片采用PWM方式实现，能实现脱机和联机两种不同的识别模式；以16位单片机MSP430F149为核心设计了硬件系统，用Visual Basic 6.0设计了基于Windows操作系统下的数据采集与模式识别软件；该软件界面友好，操作简单，数据结果准确，运行可靠、稳定，既可以长时间实时显示各传感器的全部动态响应过程，又可以用BP神经网络进行模式识别。

Software Description: About Black Rain: Afflatus, The year is 2681, and the Unified Field Theory has long been complete.

Black Rain： Afflatus 2681年，弱电磁理论完全成立已经很长时间。

THey are very affordable and last a long time.

他们是非常便宜，并且持续很长时间。

He cherished his ful Afro and could spend a long time picking at it in order to make it appear just right.

他很喜欢他的非洲式发型，他会花很长时间来打理，使发型很好看。

It is only after a long time that he

在很长时间之后

After a long time, he stopped to have a rest.

长时间之后，他停下来休息。

After a long time he returned to the normal consciousness of the world.

过了很长时间后，他恢复了正常的意识。

After a very long time ...

很长时间后

After what seemed to be a long time , he came back to life.

似乎过了很长时间之后，他才苏醒过来。

After crunching for so long, the crash is the aftereffect.

经过这么长时间的工作，垮掉是正常的后果。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。