查询词典 difference equation

Taking Yanhe as an example, the distinct transition point of flood season runoff time series by the impacts of human activities has been detected by way of mathematical statistics analysis. And meanwhile, based on the datum before distinct transition point, the forecast model is set up only with the data series before the distinct transition point. The difference between the value derived from the equation and the observed value is right the influence on flood season runoff induced by human activities.

以延河流域为例，采用数理统计方法推估获取人类活动影响下汛期径流时序的显著转折点，以显著转折点前的数据建立预测模型，对比分析汛期径流量的实测值与预测值，其差值即为人类活动对汛期径流的影响程度。

Results Among the 38 pedigree charts, 44.7 percent of the diabetics had the background of family tree and 25 symptoms were listed out which were illustrated by a typical pedigree chart. The difference between the total score of kidney-deficiency syndrome with and without family tress is statistically significant (P.05). The total score of four-diagnoses showed a linear correlation with the kidney-deficiency and the regression equation was =

结果在38幅家系图中，有家系背景者占44.7%，进一步举出25项单个症状，及典型家系图加以说明之；无家系背景的肾虚总分和有家系的肾虚总分具有统计学差异（P.05）；四诊总分和肾虚总分呈线性相关，回归方程为=

Based on anisotropic elastic wave equation staggering grid high-order finite-difference numerical simulation, the wave field response characteristics of vertical fracture medium with different densities and infillings were studied.

利用各向异性弹性波方程交错网格高阶有限差分数值模拟方法，开展了不同密度和不同充填物的垂直裂隙介质的波场响应特征研究。

At present, the common numerical methods are finite difference, finite element , boundary element, integration equation and transmission line method.

目前，解决这类问题的数值方法主要有有限差分法、有限元法、边界元法、积分方程法、传输线法等。

Firstly, the basic principle of Finite-Difference Time-Domain is introduced and the 2-dimensional FDTD equation is derived from the Maxwells equations, calculated by setting up the appropriate excitation source, cell size, the interval of space and time.

首先，介绍了时域有限差分法的基本原理，从麦克斯韦方程出发，建立二维空间中的时域有限差分方程，通过设置合适的激励源、网格尺寸、空间和时间步长进行计算。

The strengthened depth and so on; on the other hand, the compound mode of those influencing factors in the design and the difference of theoretical model should not be ignored, So, a state equation of limit equilibrium, which was applied to stability analysis of soil nail structure, was set up considering the influence of inter-slice force and combining the idea of disturbance force of Sarma with slice method. In the design of timbering of excavation, the reliability theory was used to analyze not only the sensitivity of random variables, including index of reliability and safety factor, but also the relationship between them.

因此，在理论分析模型方面，应用Sarma所提出的扰动力概念与条分法相结合，建立了考虑条间作用力影响的土钉支护结构稳定分析极限状态方程；在开挖支护设计方面，运用可靠度理论分析了各项设计参数及其组合方式对安全系数与可靠度影响的敏感性，以及安全系数与可靠度的相互关系。

We first review the finite-difference scheme proposed by Qin in 1988 which solves the eikonal equation along expanding wavefronts and analyze its advantages and disadvantages.

回顾了波前扩展有限差分地震波走时算法及其主要优缺点，分析了该算法在程序实现过程中存在的一些问题。

Statistics results showed that the genotype frequency of Anak red broiler was significantly different from Rugao yellow and Red jungle chicken, but there was no difference between Wenchang chicken and Silkies. All the breeds except Anak red broiler complied with Hardy-Weinberg equation.

统计结果显示：安卡肉鸡基因型频率的分布与如皋黄鸡、红色原鸡存在显著差异，文昌鸡基因型频率的分布与乌骨鸡差异不显著，除安卡肉鸡外所有鸡种均处于Hardy-Weinberg平衡状态。

IF other characters have same level and PLGA Mw≤100000, the difference of release speed is obviousless. The results of simulate patterns show, PLGA Mw=15000, the microspheres almost fit the equation Higuchi and Weibull distribution, PLGA Mw= 44000, the microspheres almost fit Zero grade release model.

体外释放模型拟合结果显示，PLGA平均分子量为1.5万的海鞘醇PLGA微球大都符合Higuchi方程及weibull分布函数，PLGA平均分子量为4.4万的海鞘醇PLGA微球体外释放最接近于零级释放模型。

Main contents are as follows :In chapter one, we give a survey to the development and current state of the oscillation of differential equations and difference equations. We also introduce some preliminary material , including some basic concepts of the oscillation theory and some important fixed point theorems.In chapter two, we investigate the oscillation of second order self-conjugate differential equation with impulses.

本文由五章组成，主要内容如下：第一章概述了微分方程及差分方程的应用背景和国内、外研究状况，这一章也包括一些预备知识，如有关微分方程、差分方程理论的基本概念和重要的不动点定理。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。