查询词典 gradient method

The method is based on the fact that the poststack zero-offset seismic section in a local time window is consisted of some linear events. Using the sparseness discrete τ-p transform and prediction biconjugate gradient algorithm to extrapolate makes the empty traces in the space coordinate reconstruction.

该方法根据叠后零偏移距剖面，在局部时窗内可以看作是一系列线性同相轴的组合，使用稀疏离散τ-p和预条件双共轭梯度算法进行地震道外推，使空间方向的缺失道得到恢复。

The obtained results a re compared with analytic solution and those from integral equation and other me ans. It is shown that the staggered grid finite difference method combined with the Biconjugate gradient iterative solver processed with divergence correction and incomplete Cholesky decomposition procedures can efficiently improve the three dimensional electromagnetic calculation with high accuracy and stability.

经与解析方法、积分方程等其他方法的计算结果对比表明，交错网格有限差分法结合散度校正和不完全乔累斯基分解预处理的双共轭梯度迭代方法进行正演计算，速度快、精度高、结果稳定，能适应三维复杂介质的数值模拟，为三维电磁反演奠定了基础。

Through the experiment, carries on the appraisal with the different digital image quality evaluation method to the digital mapping cameral image quality, obtain some image quality situation like uniformity gradient、entropy、 MTF and so on under the different appraisal target Through this topic research I have a system understanding to the quality evaluation of digital mapping cameral image .

通过实验，用不同的数码影像质量评价方法对数码航摄影像质量进行评价，获得在像元均匀梯度、信息熵、MTF等不同评价指标下的影像质量情况。通过本课题的研究使我对数码航摄仪影像质量评价有一个系统的了解。

Through the experiment, carries on the appraisal with the different digital image quality evaluation method to the digital mapping cameral image quality, obtain some image quality situation like uniformity gradient、entropy、 MTF and so on under the different appraisal target Through this topic research I have a system understanding to the quality evaluation of digital mapping cameral image .

通过实验，用不同的数码影像质量评价方法对数码航摄影像质量进行评价，获得在像元均匀梯度、信息熵、MTF等不同评价指标下的影像质量情况。通过本课题的研究使我对数码航摄仪影像质量评价有一个系统的了解。：数码航摄仪，数字影像，质量评价

Methods Density gradient centrifugalization combined with adherence method were used to segregate and cultivate rat MSCs. MSCs cultivated to the 3 rd passage were characterized using flow cytometry technique. TGF-β1 with 1, 2 and 5 μg/L were pretreated on MSCs for 8 h, then serum and oxygen deprivation were used to cause analogous ischemia of MSCs in vitro. AnnexinV/PI flow cytometry technique was used to evaluate apoptosis and survival of MSCs.

采用密度梯度离心结合贴壁法分离、培养大鼠MSCs，对培养第3代的MSCs进行鉴定；用1、2、5μg/L的TGF-β1分别预处理细胞8 h，然后用血清剥夺和低氧处理建立MSCs体外模拟缺血性损伤模型，通过流式细胞术评价MSCs的凋亡及存活情况；用Western blot方法检测2μg/L的TGF-β1对Akt和p-Akt表达的影响。

On the basis of experimental data, by the aid of boundary-element method, the temperature distribution, temperature gradient and colling velocity in the casting region ran be calculated.

本文建立了铝在双辊式铸轧时铸造区温度场的数学模型，根据实验数据用边界元法计算出铸造区的温度分布、温度梯度和冷却速度。

The experiment results show that the method can improve the average gradient and preserve spectrum index commendably.

实验表明算法有效提高了图像的清晰度和保持了光谱特性。

This paper investigated the true propagation paths of acoustic wave in two-dimensional temperature gradient field-single peaked symmetry and deflective respectively, using the two- dimensional acoustic ray tracing method of forward deploying triangle. Besides, a simulating calculation and analysis of this acoustic ray tracing algorithm in model temperature was given.

该文使用二维空间中的三角形前向展开方法，对二维温度梯度场中的声线轨迹进行追踪，并分别在具体的单峰对称温度场和单峰偏斜温度场模型中，对该声线追踪算法进行了仿真计算和分析。

According to different acidity of free Flavonoids in Resina Draconis, different acidic lavonoids were extracted with the pH gradient extraction method from ethyl ether.

根据血竭中游离黄酮存在着酸性差异，采用溶剂除杂，转溶于乙醚，再用pH梯度萃取得到不同酸性的黄酮，进而对弱酸性组分分离纯化得到2个单体化合物。

In this paper, based on the propagation characteristic of sound wave in pulsed electroacoustic method and temperature dependence of polyethylene properties, the effect of temperature gradient on space charge measurement is analyzed and the space charge waveform is recovered.

本文基于电声脉冲测量方法中声波的传播特性和温度对聚乙烯材料特性的影响，分析了温度梯度场对空间电荷测量结果的影响并进行了波形恢复。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。