稀疏

Moreover, a new method of instantaneous frequency estimation is proposed.

在第四章中，介绍了信号稀疏分解在DOA估计中的应用。

Firstly, Wavelet-Galerkin algorithm for solving the first kind of singular integral equation with the Hilbert kernel is proposed, we use the characteristic of periodic wavelet on L~2([0,1]) and Hilbert kernel to solve and make stiff matrix lower dimensions and become sparser through thresholding,thus the cost of computation is reduced. Because of the singularity of Hilbert kernel we use Tikhonov regularization method to solve the system of stiff equation. At last the convergence and numerical result of approximate solution are given. Secondly, an approach of regularization based on Fourier is presented for sideways heat equation; we give the theory proof and error estimate.

首先，提出了含Hilbert核的第一类奇异积分方程的小波伽辽金(Wavelet-Galerkin)数值算法，该算法中利用了L~2([0，1])上的周期小波和Hilbert核的特点进行处理，使得刚性矩阵维数降低并且通过阈值使得它更加稀疏，减少了计算量；由于Hilbert核的奇异性，通过Tikhonov正则化方法求解所得到的刚性方程组，给出了收敛性和数值结果；其次，对标准的一维逆热传导方程给出了一种基于Fourier正则化方法，给出了理论证明及其误差估计，解决了文献中算法与理论误差估计的不相匹配的现象，该正则化方法不仅保留了测量数据的部分高频成份，且与文献中的算法具有同样的计算量和误差估计。

All the stars are made of plasma, and even the space between the stars is filled with a plasma, albeit a very sparse one (See astrophysical plasma , interstellar medium and intergalactic space ).

所有的星级是血浆，甚至之间的空间星级充满了等离子体，尽管是一个非常稀疏（见天体物理学等离子，星际介质和星际空间）。

This paper presents a new real-time voltage/reactive power control algorithm based on primal-dual interior point method.

摘 要：提出了一种充分利用稀疏技术的基于原—对偶内点法的电压无功实时优化控制算法。

The experimental results present that the three electrodes DBD is basically display filamentary discharge mode. The intermittent filament impulses of current wave of the comb-like electrode are unsymmetrical while that of the plate-plate electrode is symmetrical. And the multineedle-plate DBD displays diffuse conical mode.

实验结果表明：三种电极放电的形式不尽相同，但基本上以细丝放电为主要特征；在放电特性上，单面梳状电极DBD呈正负半周期内电流波形上加载非对称的电流脉冲群，双介质板电极DBD则是对称的电流脉冲群，而多针—介质平板电极放电电流波形上既加载了具有电晕放电特征的稀疏幅值大电流脉冲群，又加载了具有DBD放电特征的密集小幅值的电流脉冲群，表现为DBD和电晕放电相叠加的效果。

Applying the representation in shape editing, our algorithm can optimally keeps the vertex angles and ratios of adjacent edge lengths in a global way, thus the editing results will preserve the intrinsic geometry details globally and perceptually.

将伸缩内在量表示方法应用于多边形编辑，从整体上优化调整邻边的长度比例和有向转角，将多边形编辑问题转化为一个稀疏线性方程组的求解。

The research of both theories and practices of gridding in the dissertation shows that: Linear interpolation based on triangulation is simple computationally and fast, but its gridding results isn't smooth and its precision is low; Multiquardric method is also simple computationally with high precision and good effect, but its gridding is slow because it is based on global calculation; Minimum curvature method is fast with high precision and good effect, but its gridding quickly degrades over areas with sparse data control when grid spacing smaller than the actual grid spacing is used; Ordinary Kriging method is high-precision, but its gridding is slow because of large calculation; Inverse interpolation is a computationally fast, efficient and robust method with high accuracy and perfect effect, and its gridding results of different gridding orientations are basically identical. Inverse interpolation is suitable for thegridding of geophysical irregular data, especially for large-scale geophysical irregular data.

本文的方法研究和数据试验分析表明：基于三角网的线性插值法计算简单，速度快，但其网格化结果不光滑，精度不够；多元二次函数法计算简单，网格化精度高，效果良好，但它是基于全局计算的，计算速度较慢；最小曲率法计算速度快，网格化精度高，效果良好，但其在稀疏控制点的网格化容易出现振荡现象；普通克里格法网格化精度高，效果良好，但其计算量较大，一般计算速度慢；反插值法网格化计算稳定，速度快，精度高，效果好，而且在网格化方向不同的情况下其网格化精度效果都达到基本一致，适合于地球物理不规则分布数据的网格化，特别是大规模地球物理不规则分布数据的网格化。

While,isogram of soil water content became more sparse,the number of closed center of isogram decreased and the location of closed center of isogram moved with changing of scale.

在尺度变化的情况下，随着尺度的变大，土壤水分的等值线变得越来越稀疏，闭合中心的数量逐渐减少，位置发生移动。

JERUSALEM CHERRY - Although this plant allegedly contains solanine, a substance found in several plants with known toxic potential, reports of toxicity are sparse.

耶路撒冷樱桃-虽然这家工厂据称含有龙葵碱，这种物质的发现在一些植物与已知有毒的潜力，报告的毒性是稀疏。

I know you grudge her jet-black hair that you hide yourself behind the thin cloud with you face half-covered.

我知道你是因为嫉妒她那乌黑的头发，所以你用稀疏云彩半遮住了你那害羞的脸。

They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性，但我大喊，并在他们的方向扔石头让他们过的线索，远离我，以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。