查询词典 gradient

The whole inverse problem may be viewed as a two-stage optimal procedure, and the optimal algorithm based on gradient, such as BFGS algorithm, is adopted as the gradient of the objective functions which may be derived by using Frechet differential.

由于两次优化的目标函数的导数都是可求得的，因此采用基于梯度的优化算法，如Broyden-Fletcher-Goldfard-Shanno变尺度算法。

Produced the gradient wind equation and showed examples of gradient wind (and its difference from the geostrophic wind) in 500mb height maps.

推导出梯度风方程并在500毫八高度地图中举出梯度风的例子（以及它与地转风的不同之处）。

Intensity of solar radiation and height of haunch were found to be the main factors influencing the temperature gradient in box girder during cantilever construction, and function expression of the main factors with temperature gradient was gained.

从而验证了影响施工期间箱梁温度梯度的主要因素是太阳辐射强度和箱梁梗腋高度，定量确定了其与温度梯度之间的关系。

First, in order to achieve a performance independent of lighting conditions, the image is transformed into a Gradient Map. And then, Hausdorff distance measure is introduced to calculate the dissimilarity between two Gradient Maps.

首先，为了克服光照变化的影响，人脸图像被转换为梯度图像，然后，引入 Hausdorff 距离度量用于计算梯度图像之间的距离。

The effect of reactive aggregate gradient distribution in cement-based functionally gradient materials on its mechanical property is compared with that of homogeneous distribution.

通过活性集料在混凝土中的梯度分布和均匀分布，研究对比了活性集料梯度分布对水泥基材料力学性能的影响。

To deblur edge after image magnifying,an adaptie edge sharpness presering image magnification is put forword,which can fit edges of any direction,gradient and amplitude,utilizing the gradient imgormation of the image and the properties of the hyperbolic tangent function haing reiewing the character of a typical edge.

针对图像放大后出现边缘模糊的现象，论文考察了典型边缘的特征，利用图像的梯度信息和双曲正切函数的性质，提出了一种较好地拟合任意方向、陡度和幅度的边缘，因此能够保持边缘锐度的自适应图像放大算法。

When the stress/strain induced by the gradient during temperature cycles needs to be known, the temperature changes inconsistently, and has gradient in space.

需要知道温度变化过程中由于温度梯度产生的应力、应变时，认为温度场是瞬态的，在空间上存在梯度。

The results showed that the photosynthetic rate of B.stamineus decreased with the increasing of the drought gradient,but the decrease amplitude was less.The photosynthetic rate of B.inermis decreased indistinctively with the increasing of the drought gradient in the prometaphase,decreased distinctively in the later stage.

结果表明：美国无芒雀麦的光合速率基本上随着干旱梯度的增加而逐渐下降，在不同胁迫天数间也逐渐下降，但下降幅度较小；本地无芒雀麦各干旱处理光合速率在胁迫前中期随胁迫梯度的增加下降不明显，到胁迫后期才表现出较为明显的下降趋势，但在各胁迫天数间差别不大，仅在胁迫第20 d各处理光合速率较之前有较为明显的降低。

Firstly,effectively edge information was picked-up by comparing and choosing maxima from colour weight gradient images.Then,a method based on multi-threshold segmentation was proposed,which can eliminate inefficacious gradient information.Finally,procedures and results of the algorithm were introduced.

首先比较并选取彩色分量图像梯度信息的最大值，达到提取图像有效边缘信息的目的；然后提出基于多阈值分割的方法消除无效梯度信息；最后介绍了算法的步骤及结果。

Firstly, nonlinear diffusion filter was used to wipe of noise efficiently and kept the edge information of the image. Secondly, gradient calculation of pixel diagonal direction was considered in the calculation of neighborhood gradient amplitude which further repressed the impact of noise. Thirdly, using average interclass variance, the self-adaptively double thresholds for different images were calculated.

首先采用非线性扩散滤波减少了图像噪声，同时保持图像的边缘信息；在邻域梯度幅值计算中，考虑像素对角线方向的梯度，进一步抑制了噪声的影响；最后采用平均方差阈值法选取阈值，从而提高了对不同图像的自适应性。

You can snipe the second and third union leaders from this position.

您可以鹬第二和第三工会领袖从这一立场出发。

Aiming at the currently shortage of XML streams quality detecting, this paper proposes a new forecasting method of XML streams quality by least squares support vector machines, which is used the method of XML keys' vector matrix as windows, and vector product wavelet transform to multilevel decompose and refactor the XML streams series, that can fulfill real-time checking demand of XML quality, and ensure constraint, consist- ency and integrality. For even more adapting net load, it proposes a control strategy by weight and adaptive adjustment to ensure XML streams quality.

针对当前XML数据流质量检测存在的不足，提出构建XML键的矢量矩阵作为窗口，利用矢量积小波变换多级分解与重构XML数据流，再结合最小二乘支持向量机对XML数据流质量进行预测的一种方法，满足XML数据流质量重构时实时检测的要求，保证XML数据的约束性、一致性与完整性；为了更好的适应网络负载，采取加权与自适应窗口调整等调度策略充分保证XML数据流的质量检测。