梯度法

The polynomial function bases are used to form the approximately matching function. Moreover, the discrete values of grey image is transformed to polinomial function that are exact fit at the considered pixel locations. As a result, The mathematical operations performed such as derivation, integration, and gradient evaluation also give out the polynomial functions, therefore, the system of undetermined coefficient equations is derived to be a system of linear algebraic equations.

我们把立体匹配过程看作泛函的极小化过程，因此选用变分问题近似解法的Ritz法构造数值算法，以多项式函数为基构作匹配函数的近似解，进而又利用多项式过样值点的拟合将离散的灰度图象变换为多项式函数，因此计算中所需的求导，积分，及梯度运算的结果仍然是多项式函数，最终将待定系数方程组化为线性代数方程组。

LI Qi-He, LUO Yu-Pin, XIAO De-Yun1. Department of Automation, Tsinghua University, Beijing 100084A fast automatic image segmentation method is presented through the combination of gradient vector flow field and seeded region growing.

摘要通过将梯度向量流(Gradient vector flow， GVF)场与种子区域生长(Seeded region growing， SRG)法相结合，提出了一种快速的自动图像分割方法。

These two small procedures are Matlab. M documents, 08 of the images Weiner adaptive filtering, 09 using five differen...

这两个小程序均为matlab的。m文件，08为图像的自适应魏纳滤波，09运用5种不同的梯度增强法进行图像锐化。

The exact of petroleum ether was the acaricidal active site of Eungenia caryophyllata. 3.Isolation, purification and identification of compounds with acaricidal activity in Eugenia Caryphyllata: The exact of petroleum ether was separated into 6 parts by silica gel column chromatography with gradually increasing polarity of petroleum ether: ethyl acetate. The part C was demonstrated to be the most effective part by acaricidal activity test in vitro,and the time for it to kill all experimental mites was about 20 min.

丁香杀螨活性成分的追踪分离、纯化与结构鉴定：采用硅胶柱层析法，以石油醚：乙酸乙酯溶剂系统梯度洗脱，对丁香石油醚提取物进行分离，得到A~F 等6 段混合物，离体杀螨试验发现，C 段混合物具有突出的杀螨活性，50%浓度平均15min可杀死全部供试螨虫。

Then identify the separated bacteria according to its shape feature and the physiological biochemical reaction results. As the result a strain of bacteria which could consume ethanol efficiently was selected and identified as Acetobacter.

在以乙醇为唯一碳源的培养基中培养，用梯度驯化法筛选高效利用乙醇的菌株，并通过形态特征和生理生化实验进行菌属鉴定。

A quantitative method of alkaloidal monomers is established by HPLC/MS.The The sepatation was performed on a XTerraTM ODS column(5μm,4.6mm id×150mm) with acetonitrile -water-acetic ammonium as mobile phase at the flow –rate of 1mL/min.

建立了苦豆子中主要的生物碱单体含量的测定方法：HPLC-MS法，色谱柱选用XTerraTMODS Column(5μm，4.6mmid×150mm)；流动相为乙腈-水-乙酸铵，采用梯度洗脱，流速为1mL/min，柱温30℃；质谱作为检测器，选择离子采集方式。

MethodsChromatographic fingerprint of Amomum villosum,Amomum chinense and Alpinia zerumbet was determined by RP-HPLC and the gradient elution mode was applied in chromatographic separation,data were analyzed by Fingerprint Similarity Evalution Software to compare the similarity of samples.

目的建立砂仁及其混淆品的高效液相色谱指纹图谱鉴定方法方法采用RP-HPLC法，梯度洗脱，测定阳春砂、海南假砂仁及艳山姜的指纹图谱，并作相似度比较分析。

On the basis of ideas of 3D-structure arithmetic model and resolvents, a concrete quasiphysical and anthropopathic algorithm is formulated.

并设计了变步长梯度下降法来求局部最优格局和拟人跳坑策略来求全局最优格局。

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。

After nucleosides were extracted from urine on phenyl boronic acid affinity chromatography, the analysis was performed on a column (4.6 mm i.d.X250 mm, 5 μm) at 22 ℃ using a lineargradient elution comprising 25 mmol/L KH2PO4 solution (pH 4.55) and 60% methanol in water with UV detection at 260 nm.

通过苯基硼酸亲和色谱法提取尿中核苷，在色谱柱(4.6 mm i.d.X250 mm， 5 μm)上以25 mmol/L磷酸二氢钾溶液(pH 4.55)和60%的甲醇水溶液作为流动相进行二元梯度淋洗，于22 ℃下进行反相色谱分离，260 nm处紫外检测。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。