查询词典 mathematical

A few overseas mathematical researchers indicated, after Jiang Chun-xuan writes the "Disprove Wiles' Proof of Fermat's Last Theorem", they would like together with Jiang Chun-xuan's proof of FLT published in China in early 1992, carefully review them together with other mathematicians of their country.

国外几位数学研究者表示，等蒋春暄将《怀尔斯对费马大定理的证明之否定》论文写出来以后，他们愿意将它与蒋春暄1992年初在中国发表的对费马大定理的证明论文一起与本国的数学家共同认真研究。

We present concrete mathematical expressions concerning relationships of P, I, J and R, a sufficient and necessary condition of J = 0, and relationships among transitivity, negative transitivity, semitransitivity, Ferrers properties between R and P and I with W as the t-norm.

主要包括P，I，J，R之间关系的具体表现、J=φ的充要条件，在W_φ意义下，R的传递性、负传递性、半传递性、Ferrers性质与P，I的相关性质之间的联系，得到了与普通情形下相平行的一些结果。

This paper focuses on mathematical model of vibrations of ferromagnetic materials under magnetisation.

探讨如何建立描述正弦电磁场中铁磁材料振动的数学模型。

In this paper, according to Fick's laws, a mathematical model of solvent diffusion in dry-jet wet-spinning process was established, and equations which can describe the solvent concentration distribution were derived.

通过Fick定律建立了纺丝液溶剂扩散的数学模型，得出了溶剂沿纤维原丝的径向分布，还讨论了各种因素对溶剂质量分数分布的影响。

A one-dimension and multi-size particle mathematical model was developed base on Bulter-Volumer equation and Fick law.

本文根据Bulter-Volumer和Fick定律，建立了研究锂离子电池的数值模型。

A mathematical model of dual-frequency ultrasound extraction kinetics based on Fick's second diffusion law was established for traditional Chinese medicine.

根据Fick第二定律建立了丹参药材中的丹参酮类化合物双频复合超声强化溶剂提取过程的动力学模型。

The mathematical model of permanent magnet is a key problem for computing electromagnetic field of permanent magnet electrical machines.

引 言近年，随着高性能永磁材料的发展，永磁电机得到了迅猛的发展和广泛的应用。

Firstly, according to electromagnetic field theory, the 2-dimensional (2-D) mathematical model of a three phase squirrel-cage Y802-2 induction motor is developed. Then general equations can be deduced from finite element discrete and functional analysis. The motor's 2D solving region of electromagnetic field is given based on the boundary conditions and assumption conditions of the squirrel-cage induction motor. Through finite element mothod and inner–outer convergence method, magnetic field distributions and magnetic forces of bars can be calculated in following rotor conditions: health rotor, one single broken bar, two adjacent broken bars, two broken bars with one good interval, two broken bars with two good interval and four adjacent broken bars.

本文首先根据电磁场理论建立Y802-2型三相笼型感应电动机二维电磁场的数学模型，并对其进行了有限元离散以及泛函分析，推导出总体方程；在基本假设和边界条件基础上，给出笼型感应电动机二维电磁场的求解区域，然后应用有限元并结合内外双收敛方法，对样机稳态运行进行数值计算，得出电机在转子完好、一根导条断裂、连续两根导条断裂、间隔一根两根导条断裂、间隔两根两根导条断裂及连续四根导条断裂六种情况下的磁场分布和导条所受电磁力的变化情况。

It does not need an external power supply to excite the rotor field and hence the field winding and slip rings are eliminated. This thesis sets up the mathematical model of the permanent magnet synchronous motor in SIMULINK.

本文主要研究了永磁同步电机交流伺服系统的建模仿真和基于TMS320LF2407A数字信号处理器的系统实现，主要内容如下：建立了永磁同步电动机在dq坐标系中的数学模型，在SIMULINK中建立了仿真模型。

You know what the figure eight is the mathematical symbol for?

你知道数字8有什么数学含义吗？

I can still vividly recall the impressive scenes you gave. You were among my friends and relatives who accompanied me from my house to the seaport and when the porters were slow to show up, you obligingly carried my suitcase for me.

你对我的种种感人情意，使我记忆犹新，那天你随着我的亲友从家里送我上轮船，搬运工迟迟不来，你毅然替我提着皮箱上船。

St. Nicholas became the patron saint of Russia, where he was famous for his red cape, flowing white beard, and bishop's mitre.

圣尼古拉成了俄罗斯人的守护神，在那里，他以身披红斗篷，留着飘逸的白胡须，戴着主教法冠而闻名。