平均差

According to three compared experiments, which are using simple tactile guide, with visual guide and with tactile board, we conclude that the simulated phosphene positioning system with tactile board is accurate (the mean error is less than 10mm) and reproducible (the standard deviation is less than 6mm) in evaluating simulated phosphene.

如此循环往复，在经过简单触觉导航、加入视觉导航和具有触摸板导航的三个对照性实验后，我们得出具有触摸板导航的模拟光幻视定位系统能够精确(平均误差小于10mm)且稳定(标准差小于6mm)的对模拟光幻视点进行定位。

The multicast routing problem that finding the minimum cost multicast routing tree with many QoS constraints may be formalized to Steiner tree problem in network, which is a NP-complete problem that an algorithm that finds a Steiner tree can not get the best solution in polynomial time.

寻找有多个QoS约束的最小代价组播路由树可以形式化为网络中的Steiner树问题，它是一个NP完全问题，在多项式时间内不能得到最优解，因此研究者所寻求的是一种次优的、在最差情况和平均情况下的性能都接近于最优的解决方案。

By offset printing machine adjustment of lining thickness, you can get the best business card printing and membership card making pressure so as to enhance business card printing and membership card product of ink bias of uniformity and mesh point of clarity.

堵住差胶印机包衬薄度的调动，可以得回最好的制卡和会员卡制作不张力，加强制卡和会员卡制作产物的不朱色浓淡的平均度和网点的澄辉度。

The spatial distribution pattern of the factors shows that distinct radiolarian assemblages are closely related to water mass, ocean current and hydrographic conditions.(4) The test of a new radiolarian-based transfer function to estimate mean-annual sea surface temperature and se

利用57个样品的统计数据，对估计表层海水年平均温度和其变化范围的放射虫转换函数（Pisias，1997）的检验结果表明，其估计误差为6℃，实际值与估计值的相关性差，可靠性低，不适合于本区使用。

A standard expected value model for multi-objective multi-stage transmission planning is presented to realize the transmission optimal planning with the control of line overloading risks. In this model, a constraint of overloading risks is built with expected value and standard deviation of random line active power and two objectives are given as expected value of the average power loss and discount value of the investment cost. By modeling uncertain informations with probability theory, the probabilistic DC power flow is adopted for the correlated calculations among random variables in the planning model.4 A novel multi-objective transmission planning approach that considers transmission investment profit is proposed. Requests for transmission investment profit and social welfare are involved in the proposed planning approach.

以方案总投资费用贴现值和平均网损期望值为目标函数，建立多目标多阶段输电网规划的期望值模型，以线路有功潮流过负荷随机变量的期望值和标准差构建过负荷风险约束，考虑了风险发生概率和严重程度两方面的特征，通过对不确定性信息的概率建模，利用概率直流潮流进行各随机变量的相关计算，实现了控制过负荷风险条件下的输电网优化规划。4提出考虑输电投资收益的多目标输电网规划方法，综合考虑市场参与者对输电投资收益和社会总福利的要求加热管及其对输电网规划的影响。

A filtered transformation and a stochastic control Lyapunov design method are applied to Marino-Tomei systems driven by Wiener noises of unknown covariance. A parameter adaptive law and a control law are obtained to ensure that the closed-up systems are noise-to-state stable and the tracking error can converge to a small residual set around the origin in the sense of mean quartic value in average.

通过滤波变换，采用随机控制Lyapunov设计方法，对于受方差未知的Wiener噪声干扰的Marino-Tomei非线性系统，给出了参数自适应律和控制律，使得闭环系统成为噪声--状态稳定的，并且跟踪误差的4次均方值在时间平均意义下收敛到一个足够小的区域内。

The root mean square error for regressed rainfall is around 65﹪ of the standard deviation and about 15﹪ of the mean rainfall.

回归的平方根误差是其标准差的60％和平均雨量的15％。

The procedure involves the generation of a second independent sample and a test that the estimates of the sample mean and standard deviation determined in the first sample are reliable estimates of the population mean and standard deviatio~.

涉及的程序产生的第二个独立的采样和测试的估计数的样本均值和标准差确定的第一个范例是可靠的估计的人口平均和标准偏差。

Firstly,"clean steel" areas are identified and the steel composition determined. In the second step, the average composition across the entire length of the scan is determined. In the final step, the average slag composition is determined by means of a difference calculation.

首先，辨别出"干净"的钢区域，测定出钢的成分；第二步，测定出扫描总长度范围内的平均成分；最后一步，通过差减法计算出炉渣的成分平均值。

Modaomen of the Pearl River is one of the main gate to the sea, the tidal estuary of the Pearl River to the type of irregular wave of half-day, annual average in the Tidal 0.86 to 1.63 meters, an influx of low-mouth.

其中磨刀门是珠江的主要出海口门，珠江河口的潮汐类型为不规则半日潮，年平均潮差在0.86～1.63米之间，属弱潮型河口。

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。