查询词典 weighted sampling

Diffusion-weighted imaging can provide qualitative and quantitative information at cellular level about tumor cellularity and the integrity of cell membranes.

磁共振全身弥散加权成像能提供细胞水平的定性和定量信息，反映肿瘤细胞构成及细胞膜完整性的变化，尤其是近几年发展的磁共振全身弥散加权成像技术，在诊断全身肿瘤原发灶，筛查全身肿瘤转移灶方面具有一定的优势，本文就其在肿瘤筛查、肿瘤特征描述、肿瘤良恶性鉴别、肿瘤疗效评估等方面的作用予以综述。

Objective: To evaluate the value of apparent diffusion coefficients in Magnetic Resonance diffusion weighted imaging with echo-planar technique in depicting the tumor cellularity and grading of astrocytomas.

目的：运用磁共振弥散加权成像技术评估近似弥散系数在星形细胞瘤的细胞密度和病理分级中的作用。

The situation after the first M step is shown in plot, in which the mean of the blue Gaussian has moved to the mean of the data set, weighted by the probabilities of each data point belonging to the blue cluster, in other words it has moved to the centre of mass of the blue ink. Similarly, the covariance of the blue Gaussian is set equal to the covariance of the blue ink.

图显示了初始的 E 步骤，用红色表示用红色 component 产生的后验概率，蓝色也是同样的情况，还有一些不太确定的点是用紫色显示的，在图中蓝色的高斯的均值已经移到了蓝色数据集的中心上，类似的，蓝色高斯的协方差设为蓝色点的协方差。

The Fed now officially frames its forecasts in terms of the chain weighted price index for personal consumption expenditures.

联储目前采用的是个人消费支出加权价格指数。

Results MRI of all WE patients showed symmetrical high signals on the brain T2WI, Flair and diffusion weighted imaging, 6 cases of them in the medial thalamus, 4 cases in surrounding the aqueduct, 3 cases in the third ventricle gray matter, 2 cases in the mamillary bodies, 1 case in the putamen,1 case in the optic chiasm, 1 case in the superior cerebella vermis and 1 case in the subcortical white matter; 2 cases had reinforcement effect. 2 cases showed no abnormal signals on T2WI and Flair early, but showed high signal symmetrically in the medial thalamus on DWI imaging.

结果 8例WE患者MRI示脑部T2WI、Flair成像及弥散加权成像有对称性异常高信号影，其中出现在丘脑内侧6例、中脑导水管周围灰质4例、第三脑室周围灰质3例、乳头体2例及壳核、视交叉、小脑上蚓部、皮质下白质各1例；2例有增强效应。2例发病早期T2WI、Flair无异常信号影，DWI示丘脑内侧对称性异常高信号影。

In this paper, different leaching procedures were used for the chondrules and chondrule fragments of Semarkona, and the U-Th-Pb compositions of leachates and residues were analyzed by TIMS method. The residues normally give higher 206Pb/204Pb ratio, suggesting higher radiogenic Pb compositions. These residues form a Pb-Pb isochron, and give an age of (4566.9±5.8) Ma with MSWD of 26, consistent to the weighted average age of 207Pb/206Pb model ages.

在本文中，对Semarkona中球粒用不同的化学浸洗流程，并测定浸洗溶液和残渣中U-Th-Pb同位素组成，其中浸洗后的残渣均给出相对较高的206Pb/204Pb比值，表明其中含有较多的放射成因Pb同位素组成，这此残渣构成Pb-Pb等时线，给出年龄为(4566.9±5.8)Ma，MSWD=26，与207Pb/206Pb模式年龄在误差范围内一致。

So a fast image retrieval method based on the weighted chromaticity histogram is proposed in this paper.

传统的基于颜色直方图的彩色图像检索方法的缺陷非常明显。

Based on the analysis of the shadow zone and the padding methods of the Radon domain generated by circular cone-beam CT scanning, this paper proposes a shadow zone padding method by distance-weighted interpolation.

通过分析圆轨迹锥束CT(cone-beam CT，简称CBCT)扫描Radon域的数据缺失问题，比较了前人提出的Radon阴影区域数据缺失填充方法的特点，提出了一种基于距离权重变量的阴影区域填充方法。

This paper establishes a mathematical model of the gas flow field inside separating column of the circumfluent circulation cyclone separator based on the N-S equation under column coordinate,gives the resolution of the cyclone flow field in separating column with weighted residual method,and compares computation values with trial values as well.

由柱坐标系下的Navier-Stokes方程出发，建立了环流循环除尘系统分离柱内流速场新的数学模型，利用具有成熟使用经验的加权残值法对流场进行求解，并与实验结果进行了比较。

The paper also proved that motivation has two important properties:upper bound property and transaction-weighted downward closure property.

5论证了激励具有两个重要的数学性质：上界特性和事务权重激励向下封闭特性。

I had a lovely dog named PiPi, he was one of my best friends.

我曾经有过一只小狗，它的名字叫皮皮，它很善良，它是我最忠实的朋友。

Newly ovulated mouse oocytes were cultured in the CZB medium supplemented with different concentrations of pyruvate before treated for activation or assayed for MPF activity.

我们猜测卵母细胞在不含丙酮酸的条件下老化的更快，并且卵丘细胞可能通过消耗不含葡萄糖的CZB中的丙酮酸从而促进卵母细胞老化。