查询词典 mathematical expectation

Attempts to correlate this metric output with both experimental target detection probability and detection time yield rather good results.(2)Based on the Search_2 dataset provided by TNO Human Factors Research Institute of Netherlands, via a simple mathematical model, the target structure similarity measure is used to quantitatively describe the effect of background clutter on the human false target detection probability.

2以目标结构相似性尺度为背景杂波度量因子，以荷兰TNO人类因素研究所提供的Search_2试验数据库为基础，通过构建数学模型的方法，定量分析了背景杂波对观察者目标虚警概率的影响，并在此基础上，讨论了人眼视觉在背景杂波干扰下的虚警概率表征模型。

Markup languages such as TeX and LaTeX can be used to create documents containing mathematical or scientific notation.

标记语言等的TeX和橡胶可用于制作文件，其中载有数学或科学符号。

In this thesis, a mathematical model of multi-path channel is established by using the theory of ray acoustic to simplify the physical of underwater sound channel.

本文利用射线声学的方法，简化了水下声信道的物理问题，构造出一种多途信道的数学模型。

The author of this article adopts the methods of literature, experiments, interviewing experts and mathematical statistics, experiments on 19 athletes from the Roller Derby class, the Department of Sports, the College of Physical Education in the Northeast Normal University and divides them into experimental and comparative groups.

本文采用文献资料法、实验法、专家访谈法、数里统计法，对东北师范大学体育学院运动系速度轮滑班的十九名运动员进行实验，把他们分成实验组和对照组。

Mainly by using mathematical modeling methods,the paper predicts scores of Chinese and the world s women triple jump,women pole-vault and women hammer throw (the women s rising events in field).

运用数学建模法为主的方法，对我国和世界女子三级跳远、女子撑杆跳高、女子链球(以上三个项目均为女子新兴田赛项目)的成绩进行预测。

In addition, the blank holding force that is required to avoid wrinkle and rupture during conical part deep drawing is researched. The necessity of reasonable blank holding force in pressing is expounded. From the view of mechanical analysis, the wrinkle critical condition of side-wall is derived for the first time by the stress state of side-wall, the main deformation region on blank. According to the critical condition of plastic instability for flange, side--wall, corner of punch on blank, The blank holding force in conical part deep drawing is divided into four different regions within its forming figure. The basic principle of reasonable blank holding force during stamping is summarized and provided. The mathematical model of reasonable blank holding force that avoids the wrinkle and rupture is established and verified by the finite element numerical simulation and the grid experiment method. The result shows that it is accurate and reliable.

此外，本文还研究了圆锥形件拉深成形过程中，随着拉深变形过程的进行，毛坯为避免产生起皱、破坏缺陷而对压边力的需求情况，阐明了圆锥形件拉深成形过程中压边力合理变化的必要性；由毛坯主要变形区悬空锥壁部分的受力变形情况，从力学分析的角度，首次推导得出了圆锥形零件悬空锥壁起皱失稳的临界条件；并根据主要变形区法兰、悬空锥壁及凸模圆角部分的塑性失稳临界条件，在其成形范围图中，将圆锥形件成形过程中的压边力划分为四个区域；总结并提出了圆锥形件成形过程中压边力合理变化的基本原则；建立了防止起皱、破坏缺陷产生的压边力合理变化的数学模式，并得到了有限元数值模拟及网格实验法的验证，证实了理论分析结果的正确性和可靠性。

ABF Value Converter also calculates the values of many mathematical functions, as well as makes it possible to conduct geometric constructions and calculations for some figures.

亚洲债券基金的价值也计算转换价值的许多数学函数，以及能够进行几何结构和计算一些数字。

Classic PID control method which is based on precise mathematical model has poor adaptivity and is not adaptive to nonlinear and time-variant plants.

经典的基于对象精确数学模型的PID控制方法的自适应性较差，难以适应具有非线性、时变不确定性的被控对象。

In the analysis, simple models and mathematical approximations are introduced.

从理论预计与实验结果的接近来看，这种解释是有意义的。

The very mathematical Arabians weren't able to obtain this result.

非常数学阿拉伯人没有能够获得这样的结果。

A carrier gas such as nitrogen is directed through line 20 and valve 22 to connect with line 26 and mix with the gas sample.

如氮气之类的载体通过管线20和阀22引入，与管线26相通，与气体样品混合。

But for the most part, knaves and parasites had the command of his fortune

然而支配他的家产的大多是恶棍和寄生虫。