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特征曲线

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Relative permeability ; conception ; curve feature ; research

相对渗透率;概念;曲线特征;研究

Objectives. To derive a smooth mathematical function representing the sagittal spinal curve from individual vertebral elements. To generate normative data using this model.

目的。从独立的椎体的矢状椎体曲线数据中获得一种能彻底表现其功能的数学模型,并且通过这种模型,我们可以模拟它的最基本的特征。

The force of potential sliding body is determined using the FISH program of 3DEC based on Limited Equilibrium Method. And the sliding force and resistance force of potential sliding body are obtained by the resolution of acquired body force along the potential sliding plane. Thus the varied factor of safety of the slope under seismic loads is obtained.

借鉴块体极限平衡分析思想,并考虑了地震动荷载的全时程特征,利用3DEC中FISH语言编程求出了潜在滑体的受力并将其沿潜在滑面分解求得潜在滑体的下滑力和抗滑力,从而求出了地震荷载作用下边坡的动安全系数历时曲线。

The feature extraction method based on efficient points of response curve is studied in time domain and frequency domain.

在时域和频域中给出了基于响应曲线波形有效点的模拟电路故障特征提取方法。

A new model of thermal contact resistance based on the statistic characteristic of roughness profile is proposed in this paper.

本文在对粗糙度曲线统计特征分析的基础上,提出了一种接触热阻的计算模型。

Firstly, the row crop and background were segmented by the excess green value. Secondly, the image strips were divided by crop image horizontally and the position was calculated by detecting the peak on the curve resulting from vertical projection of strips. Finally, the crop rows center lines were accomplished by robust regression.

对作物图像运用过绿特征值分割作物和背景,将得到过绿特征图像划分为若干水平图像条,对图像条过绿特征值进行垂直投影,求取投影曲线上突出峰点的位置;利用稳健回归法对位置点进行线性拟合得到作物的行中心线。

The water-level curves from 20 tide-gauge stations along the coasts of Bohai and Yellow Seas were collected.The seiche parameters were selected according to these water-level curves obtained.

基于港湾假潮振动的基本原理,从渤海、黄海沿岸 2 0个验潮站多年水位自记曲线资料获取假潮参数,并对其做了统计分析,给出了假潮的统计特征,还讨论了假潮形成的初步原因。

Based on systematic analysis, nine seismometry parameters that response earthquakes well in North China are selected, which are seismic frequency, seismicity scale, mf-value, b-value, D-value,η-value, seismicity intensity entropy and seismicity time entropy. Using synthetic anomaly index method, we calculated their seismic anomaly index values separately and synthesized these values into a chronogenesis curve. After studying its short-term anomaly characteristics to earthquakes, the criterion index for M≥5.8 earthquakes in North China is obtained. The R-value test indicts that it has good prediction effect.

在系统分析并筛选出华北地区地震频度、地震活动标度、mf值、调制比、b值、D值、η值、地震活动强度熵和地震活动时间熵等映震较好的9项测震学参数基础上,应用综合异常指数方法,分别计算了它们各自的地震异常指数时序值,进而合成得到华北地区测震学综合异常指数时序曲线,通过研究其地震短期异常特征,给出了华北地区M≥5.8地震短期综合预测的判据指标,经R值评分检验表明,该指标具有较好的地震预测效能。

Its characteristic band is sensitive to the polarity of environment. It was found that the semilogarithmic plot of λ versus surfactant concentration exhibited two inflection points. The first inflection point corresponded to the critical micelle concentration, and the second inflection point C(subscript cm addressed the critical point reaching dense structure in the micellar core.

由于它的荧光特征波长对环境极性的敏感性,其荧光发射波长-表面活性剂浓度(λ-1gc)曲线出现了2个浓度相距较大的转折点,第一个转折点对应临界胶团浓度,第二个转折点C则表征胶团结构达到较为密实的临界点。

The proposed method can reconstruct curves from data set with arbitrary topology, such as simply connected, multiple connected and closed scattered points, keep the shape characteristic of point set well, especially in the segments with high curvature, and provide effective methods and technologies for the screw reconstrucion.

因此最短路逼近算法有效地解决了单连通、多连通和封闭的数据点集的曲线重建问题,较好地保持了数据点集的形状和走向,尤其是带尖点的数据点集的形状特征,为旋转面、螺旋面和可展曲面面的重建提供了有效方法和技术。

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