方差比

Both analysis and practical computing show that this filter can get a much lower variance bound than a priori one can.

理论分析和实际计算结果表明，本算法能达到比验前滤波小得多的滤波误差的方差上界。

The operations for extracting the smallest eigenvalue and the corresponding eigenvectors of the augmented data co rrelation matrix is O and less than the ones of Davila′s RTLS algorithm per time step.

在追踪与增广协方差矩阵的最小特征值相关联的特征矢量过程中，这个算法每步须O乘法运算，比Davila的RTLS算法的运算量少。

And the data rate is adapted to maximize the spectral efficiency subject to average bit error rate constraints.

推导出基于预测的信噪比和预测误差方差的数据速率的最优解，以此对数据速率进行调整，使得频谱效率在误比特率的约束条件下达到最大化。

BecauseIMLC is involved in not only Bulmer′s effect of selection on variance decrease but alsoancestor and its offspring′s "selective advantage"by the regression of offspring′s breedingvalues on their ancestor′s,it comes to the conclusion that IMLC could predict morereasonable and more accurate rates of inbreeding in a small closed nucleus.

作者认为长期贡献方法预测闭锁核心选择群体的近交率结果比Robertson方法更合理且更准确，这是因为长期贡献方法不但考虑了闭锁群体因选择而遗传方差降低的Bulmer效应，而且，通过后裔指数育种值对其祖先指数育种值的回归考虑了被选个体本身及其后裔的选择优势。

The columna soil study showed that strain NBT had the ablity of potassiumuptake ,making losed potassium from the soil inoculated with the bacterium wasdecreased by

通过土柱试验发现，硅酸盐细菌NBT菌株还具有保钾功能，供试土壤接菌处理后的土壤滤液中流失的钾比对照减少35.5-56.5％，经方差分析，差异达显著水平；另外，硅酸盐细菌NBT菌株与农药的相容性试验表明，无论在大田农药施用浓度和残留浓度内的丁草胺、绿黄隆、三唑酮粉、多菌灵、马拉硫磷等农药对NBT菌株没有抑制作用；乐果、甲基1605在大田施用浓度下，对NBT菌株有一定抑制作用，而在残留浓度下，对NBT菌株无明显抑制作用。

This thesis mainly discuss following issues, Theory and simple expressions for array covariance matrixes are derived when angular spread functions are symmetric distribution functions, i. e. the Uniform distribution, the Gauss distribution, the Laplace distribution and the Von Mises distribution, and a non-symmetric distribution function, i. e. the Gamma distribution. And the relation between the effective signal subspace and the array number, or and the nominal angle of the distributed source, the angular spread, the distributed functions, and the Signal-to-Noise Ratio is gained. The dimension of the effective signal subspace increases with increment of the array number. And it is more obvious to the non-symmetric distribution. The dimension of the effective signal subspace decreases with increment of the nominal angle. And the distributed source is equal to a point source as θ=π/2. The dimension of the effective signal subspace increases with increment of the angular spread.

本论文针对阵列信号处理中广泛存在的分布源现象，主要讨论了以下问题：推导了角度分布函数分别为对称的均匀分布、高斯分布、拉普拉斯分布、Von Mises分布和非对称的伽马分布时，分布源阵列接收信号协方差阵的严格模型和简化模型，得到了单个分布源的有效信号子空间随阵元数、分布源中心角、分布角、角度分布函数和信噪比的变化规律：随着阵元数的增加，对所有角度分布函数的有效信号子空间维数也随着增加，且非对称分布函数的有效信号子空间充满整个空间的可能性更大；随着分布源中心角逐步增加，有效信号子空间维数逐步减小，当θ=π/2时，等价于点源情形；随着分布源分布角逐渐加大，有效信号子空间维数也随之增加，直到有效信号子空间充满整个空间；随着信噪比的增加，有效信号子空间维数有一定程度的减少。

Prevalence of PVR and retinal detachment were observed by direct ophthalmoscopy, B-scan uttrasonography and pathology study.

的剂量比对照组低，联合用药组上清中几－6、IL－8和TrNF－Q 比其他各组均低，方差分析显示各组之间具有显著性差异。

Multicollinearity ; condition index ; variance decomposition proportion ; signal-to-noise ratio ; partial ridge estimator

复共线性；条件指标；方差分解比；信噪比；部分岭估计

The optimal processing conditions are as follows: roasting temperature at 1 000℃, roasting time for 40 min, the ratio of NbH dosage to theoretic dosage at 1.1. The specific capacity of niobium suboxide of preparation by agate grind procedure is 69.50 mF·V·g-1, the loss is 11.25%, the leakage current is 1.8×10-4A·F-1·V-1, and the electrical properties are better than that of the national standard (GB/T 3136-1995) of FTa16-300 tantalum powder for capacitor.

用正交试验法及方差分析对玛瑙研磨工艺进行优化，得到制备低价铌氧化物最佳条件是：焙烧温度为1 000℃，焙烧时间为40 min， NbH用量与理论量之比为1.1，所制得的产物杂质含量低，比容为69.50mF·V·g-1，损耗为11.25%，漏电流为1.8×10-4A·F-1·V-1，其电性能指标高于FTa16—300电容器钽粉国家标准(GB/T 3136—1995)所规定的值。

Based on the split window method, the classification of the ground land cover types, and the given spectral emissivities range in thermal infrared bands for each ground class and the fact that the actual land surface temperatures are the same for all thermal bands of MODIS, the land surface temperature were determined by means of maximum correlation and least square fit.

因此，本文在地表温度遥感定量反演的局地分裂窗算法的基础上，依据MODIS的多个热红外通道，其中的任意两个通道组合，通过分裂窗算法得到的地表温度都应该相等这样一个事实，在对地物进行分类的基础上，给定地物的波段比辐射率的范围，借助于两组温度之间的最大相关和最小方差，通过迭代的方式得到地表温度和分裂窗算法所使用的MODIS热红外通道的波段比辐射率。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。