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波形极性
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  “波形极性”译为未确定词的双语例句
     BSR is the basement of the gas hydrates, and the polarity of the wavelet of the BSR and seafloor are reverse. If gas hydrates and free gases exist in the strata, the wavelet of the BSR will change.
     当地层中富含水合物及下伏游离气时,其波形剖面有明显的反映,BSR波形极性与海底反射极性相反,大致代表含水合物层的底界。
短句来源
     The interval velocity and P velocity of seismic profiles A and B in the northern slope of the South China Sea were calculated by the methods of Dix equation and velocity inversion.
     采用D ix公式法和速度反演法分别对南海北部陆坡测线A和B的层速度及纵波速度进行计算,结合BSR、振幅空白带以及波形极性反转等多种水合物赋存信息的分析,对水合物成矿带的速度特征进行了综合研究。
短句来源
     BSR is the bottom of the gas hydrates zone,and the polarity of the wiggle of BSR and seafloor are reverse.
     BSR波形极性与海底反射相反,它大致代表含水合物层的底界;
短句来源
  相似匹配句对
     replay of waveform data;
     波形回放;
短句来源
     Effect on aluminum-alloy TIG welding quality of double pulse modulated variable polarity waveform
     双脉冲变极性波形对铝合金TIG焊焊接质量的影响
短句来源
     Studies on the Polarity of Auricularia Auricula
     木耳的极性研究
短句来源
     Waveform Synthesis Technology
     波形合成技术
短句来源
     Demonstration on Polarity of Relay Protection
     论继电保护的极性
短句来源
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Multifocal visual evoked potentials (MVEP) across the central visual field of 8 6 degrees of arc were tested in 31 normal eyes. It was observed that the mean response densities of the MVEP reduced with the increasing eccentricity; and were higher in the lower hemifield than those in the corresponding mirror symmetric locations in the upper hemifield. The incidence of polarity reversal was higher in the upper hemifield. The variation of the MVEPs across the visual field reflects the underlying anatomy...

Multifocal visual evoked potentials (MVEP) across the central visual field of 8 6 degrees of arc were tested in 31 normal eyes. It was observed that the mean response densities of the MVEP reduced with the increasing eccentricity; and were higher in the lower hemifield than those in the corresponding mirror symmetric locations in the upper hemifield. The incidence of polarity reversal was higher in the upper hemifield. The variation of the MVEPs across the visual field reflects the underlying anatomy of the retina and the visual cortex.

研究31只正常眼视野中央86度的多焦(多刺激野)视诱发电位(multifocalvisualevokedpotential,MVEP)在视野各部位的特征.观察到平均反应密度随离心度增加而减少,并且在下半视野比在上半视野相应部位高;在上半视野,MVEP波形的极性反转发生率较高.MVEP在视野中的改变反映了视网膜和大脑视皮层解剖特征及其拓扑投射关系.

It's very significant to use the wavelet profile of the BSR to distinguish the gas hy- drates and underlying free gases in the strata. BSR is the basement of the gas hydrates, and the polarity of the wavelet of the BSR and seafloor are reverse. If gas hydrates and free gases exist in the strata, the wavelet of the BSR will change.This paper searches for the seismic evidence and analyzes their features, including reflection coefficient, polarity and wavelet.

BSR的波形剖面对判断地层中是否存在天然气水合物及其下伏游离气具有重要的意义。当地层中富含水合物及下伏游离气时,其波形剖面有明显的反映,BSR波形极性与海底反射极性相反,大致代表含水合物层的底界。本文根据国内外的研究成果,综合分析了BSR的反射系数、极性和波形特征。

Objective To investigate the waveform characters of single channel mVEP and its variability in normal Chinese people. Methods VERIS Science 4.3 system was used to record and analyze single channel mVEP. The stimulation was performed with a 60 pattern segment dartboard configuration. The Michelson contrast was 99% and the repetition rate 75 Hz. Recording electrodes were placed 3 cm above and 3 cm below the inion. The m-14 sequence required 4 minutes of recording time per eye, which was divided into 8 short...

Objective To investigate the waveform characters of single channel mVEP and its variability in normal Chinese people. Methods VERIS Science 4.3 system was used to record and analyze single channel mVEP. The stimulation was performed with a 60 pattern segment dartboard configuration. The Michelson contrast was 99% and the repetition rate 75 Hz. Recording electrodes were placed 3 cm above and 3 cm below the inion. The m-14 sequence required 4 minutes of recording time per eye, which was divided into 8 short segments. The signal was amplified 100 000 times and band-pass filtered between 3 and 100 Hz. The first slices of second kernel at 60 locations were analyzed. The main wave peak-to-trough amplitude and latency from 30 to 130 ms signal window were measured and calculated with the costumed Matlab program. The study included 64 normal subjects (39 women and 25 men). The age range was 13-66 years. 7 subjects were tested 2-7 times on different occasions for reproducibility. The statistic analysis was performed with Excel and SPSS. Results In mVEP trace array, the polarity of upper hemifield traces was usually opposite to lower hemifield traces. However, at near vertical meridian areas and near below horizontal meridian areas, the trace polarity had some variability. The main wave mean amplitudes of 60 location responses in left eye were from 0.177 μV to 0.401 μV. The amplitude CVs for 60 locations were from 36.6% to 60.7%. The mean latencies of 60 location responses were from 100 to 116 ms, and latency CVs were from 8.8% to 18.1%. The smaller signals located in zones of upper periphery, along vertical meridian, below horizontal meridian and the larger signals located in near horizontal meridian areas and near non-axial meridian areas which distribution is like a bow tie. There was smaller amplitude variability in the some upper hemifiled locations with smaller amplitude, and there was larger amplitude variability in the some lower hemifiled locations with larger amplitude. The mean amplitudes of all 60 locations in male subjects were lower than that in female subjects, in which 30 locations were low significantly ( P <0.05). The gender influence on latency was less, in which only at 10 locations the difference was significant ( P <0.05). At 20 locations of all, which were mainly distributed at near vertical meridian of lower hemifiled, there was a significant positive correlation of age with amplitude. The age influence on latency was also less. Conclusions The larger variability of main wave peak-to-trough amplitude in single channel mVEP existed in different subjects and different locations of same subject. In analysis of mVEP amplitude, the influence of VEP curve location, gender and age should be considered. The main wave latencies of intersubject and intrasubject have smaller variability, and less effect by gender and age, so latency may be a useful diagnostic parameter.

目的 探讨国人单通道多焦视诱发电位(mVEP)多个位点的波形特征及其变异性。方法 采用EDI多焦电生理系统单通道记录和分析mVEP。刺激图案含60个扇面的圆形飞镖盘样图形,对比度为99%,刺激频率为75Hz,测试野范围26°。m 系列长度为214。每眼记录分8段。双极电极跨立于枕骨粗隆上、下各3cm处。放大器增益105 倍,通频带3~100Hz。应用Matlab程序对mVEP60个位点二阶一次反应测量与计算在40~130ms观察窗范围内主波峰谷振幅与潜伏期。正常受试者64例,男性25例,女性39例,年龄13~66岁。对7例受试者在非同一日进行了2~7次的可重复性试验。用Excel与SPSS软件进行统计学分析。结果 mVEP曲线阵列中,上、下半野波形通常极性相反,但在近垂直中线区及下方近水平线区,波形极性变异较大。左眼60个位点中各位点的平均振幅从0. 177~0 .401μV不等,振幅变异系数36. 6% ~60. 7%;平均潜伏期从100~116ms,潜伏期变异系数8. 8% ~18 .1%。较大振幅的波形呈“领结”状分布,在上方的周边区、沿垂直中线处及沿水平线下方mVEP反应振幅明显较低。上半...

目的 探讨国人单通道多焦视诱发电位(mVEP)多个位点的波形特征及其变异性。方法 采用EDI多焦电生理系统单通道记录和分析mVEP。刺激图案含60个扇面的圆形飞镖盘样图形,对比度为99%,刺激频率为75Hz,测试野范围26°。m 系列长度为214。每眼记录分8段。双极电极跨立于枕骨粗隆上、下各3cm处。放大器增益105 倍,通频带3~100Hz。应用Matlab程序对mVEP60个位点二阶一次反应测量与计算在40~130ms观察窗范围内主波峰谷振幅与潜伏期。正常受试者64例,男性25例,女性39例,年龄13~66岁。对7例受试者在非同一日进行了2~7次的可重复性试验。用Excel与SPSS软件进行统计学分析。结果 mVEP曲线阵列中,上、下半野波形通常极性相反,但在近垂直中线区及下方近水平线区,波形极性变异较大。左眼60个位点中各位点的平均振幅从0. 177~0 .401μV不等,振幅变异系数36. 6% ~60. 7%;平均潜伏期从100~116ms,潜伏期变异系数8. 8% ~18 .1%。较大振幅的波形呈“领结”状分布,在上方的周边区、沿垂直中线处及沿水平线下方mVEP反应振幅明显较低。上半野mVEP振幅较低区,其振幅变异一般也较小;下半野振幅较大的区域其振幅的变异也较大。所有60个位点的平均振幅男性均低于女性,其中30个位点差异有统计学意义(P<0 .05)。而性别对mVEP潜伏期?

 
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