平均差

Target tracking ; Template updating ; Minium Absolute Difference ; Kalman filter

目标跟踪；模板更新；最小平均绝对差值函数；卡尔曼滤波

In this paper, in situ measurement of nitrous acid and retrieval of aerosol parameters in a fixed wavelength range (307 nm—380 nm) were performed with DOAS system developed by our laboratory.

利用差分光学吸收光谱仪进行亚硝酸气体的测量并同时在固定的波长范围内(307—380nm)反演气溶胶参数包括气溶胶的平均直径、总个数和总比表面积等。

The average age of onset for stroke is 45 years with a range of about 30 to 70 years.

发生卒中的平均年龄为45岁(极差30～70)。

Considering the effect of interval on the original estimation accuracy and noise factors, the optimal interval, which minimizes estimation errors, is derived. It is related with MT's velocity. In order to reach the optimal interval, joint velocity estimation and interval calculation are applied. Finally, the feasibility of proposed algorithms is discussed.

通过对AWGN信道下的COV速度估计精确建模，数值分析了协方差计算间隔对COV算法本身精度及噪声因子的影响；根据分析的结果，以归一化平均误差最小为目标对估计算法进行了改进，获得了基于COV的精确速度估计；最后还对算法的可行性进行了讨论。

In two-stage estimate, used orthogonal transformation to estimate aggregate average and fitting constants method to estimate variance which was unbiased.

在两步估计法中，利用正交变换得到了总平均的估计，然后采用拟合常数法得到了方差的估计，并证明了该估计是无偏估计。

Result］all 11 patients were followed up for an average time of 2.6 years (range,1.1～3.8 years).according to otani's classification criterion,the results were excellent in 7cases,good in 3 cases, fair in i cases,no poor case and failure case.the excellent and good results were obtained in 90.91% of the patients.

结果］11例患者获得1。 1～3。 8年术后随访，平均随访2。 6年。根据otani′s等分级方法进行疗效评价：优7例，良3例，可1例，差0例，失败0例。手术优良率为90。

The distribution pattern of ten Tsuga tchekiangensis populations in the Mang Mountain were analyzed by the variance/mean ratio method,and their aggregated intensities were were measured by using the following indices:negative binomial parameter,dispersal index,clumping index,crowing mean index and patchiness index.

采用方差/均值比率法对10个南方铁杉种群的分布格局类型进行了分析，同时，采用负二项式参数、扩散性指数、丛生指数、平均拥挤度指数和聚块性指数计测这些种群的空间聚集强度。

And such methods V/m ratio t-test, negative binomial parameter, index of dispersion, Cassie index, index of clumping, index of mean crowing and index of patchiness are employed to analyse various dominant populations of Heptacodium miconioides community in the Tiantai Mountain in Zhejiang province and distributive patterns of Heptacodium miconioides community in different quadrats, and this paper also examines the intensity of Heptacodium miconioides population in different quadrats by means of stand classes.

摘 要 以浙江省天台山七子花群落为研究对象，采用相邻格子样方法取样数据，应用方差／均值比的t检验法、负二项参数、扩散型指数、Cassie指标、丛生指标、平均拥挤指数和聚块性指数等方法，分析了七子花群落各优势种群以及七子花种群在各样地中的分布格局，并分立木级对七子花种群在不同样地内的集群强度进行了测定。

Second, this dissertation analysises the performance of TA cyclospectrum estimation, and derives the averaged cyclic periodogram which can make the variance to be reduced.

第二，本文分析了TA(Time Aliasing，时间重叠)循环谱估计方法的性能，并推导了使方差得以减小的平均循环周期图方法。

The bias of cyclic periodogram with ssinc window is analyzed in both spectrum frequency direction and cycle frequency direction, and that the TA cyclic spectrum estimation is unbiased is analyzed. The average method of cyclic periodogram is also derived in terms of STFT.

论文中通过分析加ssinc窗的循环周期图在谱频率方向和循环频率方向的偏差，表明TA循环谱估计是无偏估计，并根据STFT方法，推导了使方差得以减小的平均循环周期图方法。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。