查询词典 mathematical expectation

I think, via research, during the period of middle school, the application form of mathematical history in concept teaching should be "the form of being in harmony"; and we should choose the suitable mathematical history content according to the teaching content and the students' perceive; we should obtain concept through paying more attention to the latitudinous teaching and recreating principles; presenting the outcoming process of mathematical history through sight principles; improving the degree of the students' attaching themselves to the process .

中学阶段，数学史在概念教学中的应用遵循的原则主要有：应用形式为&融入式&为主；根据教学内容和学生的认知选择合适的数学史内容；在应用时应注重认知纬度的教学；遵循再创造的原则获得概念；遵循直观性原则呈现数学概念的演变过程；采用灵活多样的教学方式，提高学生的参与程度。

Aiming at a class of complex electromechanical systems, such as 4-high or multi-high cold mills and continual mills, we firstly construct mathematical models of every subsystems by means of structural principle modeling method; nextly, get the overall mathematical model of electromechanical drive system by joining together these subsystems'models according to coupling variables and parameters; we finally simplify the overall model according to time-scale principle which can retain main eigenvalues and significant state variables, and obtain a practical mathematical model of complex electromechanical system. By simulating the CM04 temper mill's model constructed by above-mentioned method, we test and verify that the modeling method is effective and practical. The study analyzes and researches the electromechanical coupling facts and acting laws existing in complex electromechanical system.

提出了系统的总体测试方案，设计了高保真度的信号隔离和缓冲器，解决了从大功率、大电流复杂机电系统主回路中提取真实谐波分量、而又能不影响系统正常运行的难题；发现了谐波电流对平整机工作状态的影响规律；确认谐波电流是可能引起平整机工况奇异、产生机电耦合振动、导致带材产品表面出现明暗振纹的一个因素；提出了一种多相整流电路谐波电流的分析计算方法，用该方法对平整机三相桥式整流供电电路的谐波分量进行了理论分析和计算，计算结果与实测结果能得到相互验证，说明该方法是可行的，实测结果是可靠的。

Therefore, the study is significant both theoretically and practically. As a result, the studying aim of this paper is to establish a practical and complete system for the prediction of ship maneuvering motion, taking into account of the influence of the environmental factors, such as the wind, wave and current, establish a practical and complete system for the prediction of ship maneuvering motion. In this paper, the OpenGL virtual reality simulation technique is introduced into the field of ship maneuver and control, and using the MMG mathematical model, the three dimensional dynamic simulation system of the ship motion is established and good results are achieved. In the process of the system development, firstly, the maneuvering motion equations for ship in the still water are established, based on the MMG module mathematical model and serial experimental result. After compiling the program, the calculation results are compared with the experimental data, the coherence between them validate the mathematical model.

在系统开发过程中，首先采用MMG分离式数学模型及相关的系列化试验结果，建立单桨单舵海洋运输船舶在静水中的船舶操纵运动方程，并编制计算程序，经与试验结果比较，证实了计算结果的正确性；为了解MMG数学模型中模型参数变化对操纵性指数的影响程度，作者在上述已有程序基础上，对有关模型参数进行偏移修正，探讨了相应参数变化后的操纵性指数，对船舶操纵性指数对模型参数的灵敏度进行了详细的分析与探讨，所得结论与工程实际相吻合，具有实际应用价值，并为进一步提高船舶操纵性预报的精度打下了基础；然后，在已有的船舶静水操纵运动模型基础上，考虑双桨双舵的影响，建立了内河双桨双舵船舶的操纵运动模型；最后，综合考虑风浪流作用力的影响，进行了船舶的操纵运动仿真计算。

The purposes of this study were:(1) to explore whether there were interactions between "Feedback" and "Goal-setting" on both students' mathematical performance and test anxiety;(2) to compare the differences of students' mathematical performance and test anxiety between students' self-set goals and teacher-assigned goals;(3) to compare the differences of students' mathematical performance and test anxiety between students of different predicting abilities.

本研究的目的有三：一为探讨「回馈方式」与「目标设定」二因子之间是否有交互作用效果存在；二为比较学生自订目标与教师指定目标间，学生在数学作业表现或是数学测试焦虑分数上的差异；三为分析学生自订目标中，不同预测能力的学生在数学作业表现或是数学测试焦虑分数上的差异。本研究的受试来自台北市、台北县六所国小261名五年级学生，使用的工具有数学乘除法测验及数学测试焦虑量表。

This article systematically discusses the relationship between mathematical metacognition and mathematical study of middle school student. And it reveals the importance of mathematical metacognition in the intelligence and ability cultivations of the student.

本文系统论述了数学元认知与中学生数学学习方面的关系，揭示了数学元认知在中学生的智力培养和能力培养的方面的重要作用。

The penman analyses the result of the investigation and considers that the factors which influence Mathematical Communication are the surroundings, the consciousness, the gift of mathematical tongues, and the mathematical thinking.

笔者对调查结果进行了分析，认为影响数学交流的因素主要有：数学交流的环境、数学交流的意识、数学语言能力和数学思维等方面。

Moreover going in for the teaching study of the mathematical thought and method in high school can make ours absorb well the international and national mathematical thought and methodology knowledge,and improve the cognition to the importance of the teaching about mathematical thought and method,so that they are able to practise consciously and selfconsciously the teaching.

而进行中学数学思想方法的教学研究更能使我们中学数学教师充分吸收国内外数学思想方法论知识，提高对数学思想方法教学重要性的认识，从而能够有意识、自觉地实践数学思想方法教学。

The single-phase induction motor that traditional freezer place deploys only with working amain, when when internal temperature rises to the temperature of expectation, compress electric machinery to be started accordingly; When the temperature that reachs expectation, electromotor quits the job.

传统的冰箱所配备的单相感应电念头仅以全速工作，当内部温度回升到冀望的温度时，压缩电机就响应启动；当达到冀望的温度时，电念头就遏制工作。

An expectation Catlin may have this summer is to be treated as an adult – I can't wait to meet her expectation.

这个夏天Catlin可能有的一种期望是想被当一个成年人。我真难以等待去满足她的愿望。

A fuzzy conditional expectation with respect to sub σ-algebra of for a fuzzy random variable is introduced in the complete probability space, and the fact that such a fuzzy conditional expectation exists uniquely is proved and its some properities are discussed.

在完备的概率空间中引进一个模糊随机变量关于■的一个子σ代数■的模糊条件期望，并证明这样定义的模糊条件期望存在且唯一，还就其某些性质作了讨论。

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。