查询词典 extrapolation

Based on the relative theories of biomathematics, a new approach to trend extrapolation of time series of ecological footprints is proposed in this paper. Materials for analysis were taken from the agricultural areas of oases in the Hexi region of Gansu province as an example.

应用数学生态学的有关理论与方法，结合生态足迹的概念，提出了一种生态足迹时间序列的新的趋势外推分析方法；并以甘肃省河西绿洲农业区为研究对象，对其生态足迹进行了趋势外推分析的实例计算。

In order to study magnetic topology in chromosphere and corona, extrapolation of magnetic field muxt be done.

要研究色球及日冕的磁场拓扑结构，必须对光球磁场进行理论外推。

The floods and droughts over the middle and lower Yangtze River can be forecasted by means of the ternary commensurable formula in direct extrapolation and its physical mechanism can be analyzed on the basis of the network structure of commensurability information system.

采用三元可公度公式直接外推法对长江流域洪水进行了预测，并结合可公度网络结构图分析了其物理机制。

By academic analyzing, it is concluded that two order discrete paraxial approximation formula of the paper, multiple transmitting formula and polynomial extrapolation formula are the different forms of continuous paraxial approximation formula, so they are with nearly equivalent precision and stability and with equivalent applicability and limitation.

据此文献[3]将傍轴近似公式归结为一类从特定的无限域模型导出的人工边界条件，并且提出了新的从一般无限域模型导出的具有普适性的、称为"多次透射公式"的局部人工边界条件。那么，是否也可以从一般无限域模型导出具有普适性的傍轴近似公式呢？

The solution to identifying the source of the spectral lines came only in 1939, with the extrapolation along isoelectronic sequences from lower states of ionization to discover that the 'coronium' lines were actually emitted by highly ionized states of elements such as iron, calcium and nicke.

在1939年解决谱线的来源，由处于低状态电离的标准电子次序推断发现其谱线实际上是由处于强电离状态的元素所激发，例如铁，钙，镍。

This project derives a general express of experiential covariance function, which is the basis of achivement of interpolation, extrapolation and continuation of local gravity field variables and estimation theirs at different heights.

提出局部重力场元经验协方差函数的通用表达方法，为实现局部重力场元的内插、外推、延拓或其他不同高度的重力场元估计一体化奠定理论基础。

In this paper, the method of wave field extrapolation and decomposition of seismic compound wave in viscoeleastic medium is presented, based on wave equation.

从粘弹性波动方程出发，建立了一种地震散射波场纵横向高分辨波场外推方法。

Emotionalism and introspection to extrapolation were two important characteristics of pre-Qin Dynasties Confucians' Thought.

对源于亲情的真实情感的极端重视和通过对道德原则的不断切身反省从而得到落实是先秦儒家思想的两大特色。

E. new extrapolation value s of finite element solutions on the first two level grids are used to provide the good initial value s on the third level grids and then an exacter finite element solution can be obtained by several CG-iterations.

摘要提出一种求解大规模有限元方程组的新外推多网格法，即用前两层网格上有限元的新外推值提供第3层细网格上的好初值，然后用几次CG-迭代能得到较准确的有限元解。

The time-domain response of the induced currents on a scattering object irradiated by a plane wave with a Gaussian pulse in time is expanded as an associate Hermite series in this paper. Using the isomorphism of the associate Hermite function and its Fourier transform, the frequency-domain information can be obtained similarly to the time-domain expansion. According to the corresponding relation between time-domain analysis and frequency-domain analysis, and using the early-time response and the low-frequency information of the induced currents, the non-known coefficients in the expansion series can be decided. The entire responses of the induced currents on the scattering object in both time and frequency domains can be obtained at one time by simultaneous extrapolation computation using both the early-time response and the low-frequency information of the induced currents.

摘要首先根据散射体在高斯脉冲平面波激励下感应电流的能量几乎全部集中在时间轴和频率轴上的有限范围内，该文将时域响应展开为系数待定的连带Hermite级数的叠加，并根据连带Hermite函数的傅里叶变换的自反性，得到与时域响应形式类似的频域响应；然后利用时域方法和频域方法分别计算散射体上感应电流的早时响应和低频信息；最后经过时域和频域联合外推计算，由早时响应和低频信息确定时域和频域响应的待定系数，从而获得了整个时域和频域的完全响应。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。