A new high - speed ert experiment system based on the bi - directional current pulse technique is designed and developed . on - line observation is realized for simulating gas / liquid two - phase flow using this experiment system 提出并研制成功了一种新型的基于双极性脉冲电流激励的高速电阻层析成像系统并实现了垂直管道的气液两相流的在线监测。
Oxygen pulse technique , xrd , h2 - tpr , and bet surface area analysis methods were used to characterize the oxygen storage capacity ( osc ) , textual property , reduction behavior and surface area of the materials above respectively 通过氧脉冲吸附, xrd , h _ 2 - tpr , bet等研究手段来表征样品的储氧能力,物相组成,可还原性能以及比表面积等各方面的性能。
2 ) the electrochemical performance of reduced samples was studied by constant - current charge - discharge , cyclic - voltammetry and potentiastatic pulse technique . the accumulative discharge capacity of partly reduced samples and these samples added proper amount of nickel hydroxide are lager than the capacity of i . c . nolemd added nickel hydroxide 2 )对还原产物进行了充放电,循环伏安,扩散系数的测定等电化学性能研究,结果表明:部分还原样以及掺了ni ( oh ) _ 2的部分还原样作为电极活性材料,其累积放电容量均高于普通的1
The experience results indicated the reliability of this kind of thermostatic control system . the analysis and compare about modern dielectric loss measuring methods are presented on chapter 3 , and the zero - crossing testing phase discrimination method is adapted as the measuring method of this measuring system . furthermore , applied high frequency pulse technique , channel self - correction technique , anti - harmonic technique are used to increase accuracy and reliability of measurement 本文对现代介质损耗测量技术进行了分析与比较,采用过零鉴相比较法作为介质损耗测量方法,并结合外施高频脉冲技术、通道自校正技术、抗谐波技术,设计了高精度介质损耗测量电路,有效提高了介质损耗测量的精度,减小了测量误差。
The main works are listed as follows : ( 1 ) based on the excitation of bi - directional current pulse technique , a new measuring circuit for weak variation of resistance was proposed for electrical resistance tomography . traditional ac current source is n ' t adopted as the exciting source . through fast bi - directional current switching , the polarization effects are eliminated 该电路主要优点如下:该电路没有采用传统的交流电流激励法作为系统的设计原理,而是通过快速的正负极性电流切换来削弱直流电流激励时激励电极的极化效应,使通过直流法来测量气液两相流的电阻微弱变化成为可能。
In this paper the methods of chronically implanting microelectrodes , combined electrophysiology with behavioral learning in vivo , were used to study the effects of low frequency stimulation ( lfs ) of the dorsal norepinephrine bundle ( dneb ) on the learning - dependent long - term potentiation ( ld - ltp ) at the hippocampal mossy fiber synapses onto ca3 pyramidal neurons . paired - pulse technique at the intervals of 75 - ms , 150 - ms and 300 - ms was used as the test stimulation . the results showed as follows : 1 本实验运用慢性微电极埋植技术和电生理学结合行为学的在体研究方法,以配对脉冲检测(间隔分别为75ms , 150ms , 300ms )为检测手段,探查了低频( 1hz , 5hz )刺激去甲肾上腺素背束( dorsalnorepinephrinebundle , dneb )对大鼠苔藓纤维- ca3 ( mf - ca3 )突触上习得性长时程增强( learning - dependentlong - termpotentiation , ld - ltp )及动物行为习得的影响。