second differential meaning in English
二次微分, 二阶微分
Examples
- Determination of stability of odd points of special second differential system
一类二阶微分系统奇点稳定性的判断 - There are many methods of edge detection . according to practical task , we choose some classical methods of edge detection including first differential ( roberts operator , sobel operator and prewitt operator ) , second differential ( laplacian operator and kirsch operator ) , log filter and canny operator . they are studied in theory and practice applying
边缘检测有很多方法，根据课题实际背景，选择了几种比较经典的边缘检测方法，即一阶算子( roberts算子、 sobel算子、 prewitt算子) 、二阶算子( laplacian算子和kirsch算子) 、 log算子和canny算子，对他们进行理论和实际应用研究。 - Using the new technique , the zero , the first and the second differential pas of some persons " blood was measured , the result shows : the new technique is more sensitive than the common pas technique . the pas of many persons " blood has absorption peak around the wavelength of 637nm and 664nm
并用导数光声光谱技术测量了各种人血的零阶，一阶，二阶导数，实验表明：导数光声光技术比普通光声吸收光谱技术具有更高的检测灵敏度；许多人的血液的光声谱在637nm和664nm附近有吸收峰。 - In chapter 2 and 3 , wave front solutions of the delay reaction - diffusion cui - lawson equation and the 2 - dimensional competitive lotka - volterra systems are obtained by constructing an upper solution and a lower solution of a second differential equation with delay . in chapter 4 , it is discussed that travelling wave solutions of the delay reaction - diffusion equations whose reaction term do not satisfy quasimonotonicity condition or weak quasimonotonicity condition
在第二章和第三章，利用一类二阶时滞微分方程解的存在性理论，通过构造这类时滞微分方程的上、下解，分别研究了含时滞和扩散的cui - lawson方程和二维竞争型lotka - volterra系统，得到了它们波前解存在的充分条件。