查询词典 spectral

The main results are as follows: the relations between local fractional integrated semigroups and the corresponding Cauchy problem, global fractional integrated semigroups and regularized semigroups are given; introduction of the notion of regularized resolvent families, and the generation theorem and analyticity criterions for regularized resolvent families are obtained; the spectral inclusions between fractional resolvent family and its generator, and the approximation for fractional resolvent families in the cases of generators approximation and fractional orders approximation; elliptic operators with variable coefficients generating fractional resolvent family on L^2 by using numerical range techniques; and the L^p theory for elliptic operators with real coefficients highest order are obtained by Sobolev''s inequalities and the a priori estimates for elliptic operators; and a kind of coercive differential operators generates fractional regularized resolvent family by applying the Fourier multiplier method, functional calculus and some basic properties of Mittag-Leffler functions.

主要结论是：给出了局部分数次积分半群和相应的Cauchy问题的关系以及分数次积分半群和正则半群的关系；引入了正则预解族的概念，并给出了其生成定理和解析生成法则；给出了分数次预解族与其生成元的谱包含关系，并研究了在生成元逼近和分数阶逼近两种情况下相应的预解族的逼近问题；利用数值域方法证明了具变系数的椭圆算子在L^2上生成分数次预解族；利用Sobolev不等式和椭圆算子的先验估计证明了具变系数的椭圆算子在其最高项系数为实数时在L^p上生成分数次预解族；运用Fourier乘子理论、泛函演算和Mittag-Leffler函数证明了一类强制微分算子可以生成分数次正则预解族，并给出了该预解族的范数估计。

To compare the performances of the proposed method with those of the commonly used image fusion methods, such as the usual wavelet fuser, the intensity-hue-saturation fuser, and the principal component analysis fuser, the SPOT and the landsat thematic mapper images are used to perform the experiment. The results show that the balance between spectral characteristics preservation and high spatial resolution retention can be achieved at different levels in image fusion.

使用法国地球资源探测卫星图像和陆地资源卫星专题绘图仪图像，将该方法与传统的小波变换融合法、强度色散饱和变换融合法和主成分变换法进行对比试验，结果表明，该方法可以在细节保留和光谱保持两方面达到不同程度的平衡，在合理的参量组合下，融合图像的目视效果和统计指标优于传统融合方法。

The compositions and FTIR spectral characteristics of hydrolysis product were studied using GC and FTIR. The results indicated that ASP3 is a kind of pectic polysaccharide which contained the main part of homogalacturonan fragments as "smooth regions" with galacturonic acid and rhaminose, and rhamnogalacturonan segments as "hairy regions" backbone. Galactose, arabinose, mannose and glucose were linked as arabinogalactan, galactan and arabinan, which were the mainly constitution of the branch.

实验结果表明，ASP3是一种果胶多糖，主要由光滑区和毛发区（富含中性糖侧链的鼠李半乳糖醛酸聚糖）两部分组成：GalA和Rha位于多糖分子的主链，由于Rha含量较低，大部分GalA相连形成半乳糖醛酸聚糖光滑区；Gal、Ara、Man及Glc位于多糖分子的支链，其中Gal以较高的聚合度与主链相连，Ara以还原性末端或低聚寡糖的形式与主链相连或与半乳聚糖末端相连形成阿拉伯半乳聚糖。

In this thesis, we employ the spectral Galerkin method to analyze the scattering phenomena of the FSS.

在本文中，我们采用频率域的Galerkin方法来分析有关频率选择表面散射场的问题。

Field equation for frequency selective surface is derived in spectral domain and solved by the Galerkin moment method.

在综合频率选择表面的设计思路及步骤的基础上，设计了分别采用单屏和双屏结构频率选择表面的四频段副反射面天线。

Based on the technical document and the measured power spectral distribution, Gauss distribution model is employed to approximate the real source.

论文结合生产厂商的技术资料和实际测量的SLD光源的功率谱密度，采用高斯分布近似其功率谱密度，建立了光源振幅的色散模型。

The earthquake ground motion is modeled as a twice filtered Gaussian white noise process, and the parameters of the power spectral density function of the process are determined.

将地震地面运动模拟成两次过滤Gauss白噪声过程，并确定了这一过程的功率谱密度函数的参数。

On the basis of the power spectra of earthquake records, the parameters of the power spectral density function of the twice filtered Gaussian white noise process are determined by adopting the least squares procedure of a nonlinear function.

根据地震记录的功率谱，采用非线性函数的最小二乘法，确定了两次过滤Gauss白噪声过程的功率谱密度函数的参数。

With the knowledge of linear algebra, general formula for arbitrary order Taylor finite difference has been derived. In this paper, the analysis of spectral property and computational error of arbitrary order TFD is presented in detail. Then it is applied into the numerical solution of Maxwell's equations. Stability condition and numerical dispersion relation are derived.

本文借助于采样定理，详细分析了不同阶Taylor中心差分格式的谱特性以及计算误差，并将任意阶Taylor中心差分格式用于数值求解麦克斯韦方程中，严格导出了稳定性条件和数值色散关系的表达式，引入了新的误差定义来衡量算法的好坏。

The generalized spectral density and its derivative can be used to capture various specific aspects of serial dependence.

广义谱密度和它的导数还可以被用来检验序列相依的各个方面，例如鞅差，条件同方差性，条件对称性，和条件等峰度性等。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷