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Therefore we use mathematical grey scale morphology to realize the background estimation and elimination.

随地形起伏动态选择阈值，实现自适应阈值法的全局分割。

Again, what is known now as group theory? was an abstract and inapplicable mathematical theory.

又比如，现在被称为"群论"的理论一度是一项抽象而没有实用性的数学理论。

Through the study above, a refined description and modeling to flow field and water surface near the groyne in river is conducted with 2-D and 3-D mathematical models. The results by simulation are consistent well with experiment data.

通过上述研究，作者采用二维和三维数学模型对水槽试验和天然河道中丁坝附近流场和水面形态进行了精细地描述和模拟，计算结果和实测结果吻合良好。

Experimental study includes the law of flow field variation and variation of water surface in affected zone by the single groyne or twin-groyne. Mathematical modeling includes following the trail of water surface in 2-D and 3-D conditions, model developing, verifying and applying ofthe model as well.

实验研究包括单丁坝及双丁坝条件下丁坝影响区内流场及水面变化规律；数学模拟方面包括二维和三维自由水面追踪及流场数学模型开发、验证和应用。

The Giotto Security Design System creates the bridge between the traditional guilloche, rossete, and security background design, originally created by cut and paste up operations, and the latest graphics technological advances made possible by complex mathematical modelling and the increasingly powerful personal computers.

Giotto 安全设计系统产生桥在传统的扭索状装饰， rossete 和安全背景设计之间，被削减本来产生而且在操作上面用浆糊黏，和最新图形被复杂数学的做模型和逐渐有力的个人计算机科技的进步制造可能的。

As one of frame data of National Spatial Data Infrastructure , Digital Elevation Model excels contour line. it can express continuous gurgitation of ground, and it can also carry out relevant mathematical analyses and imitation, so it is applied broadly in various fields at present.

数字高程模型DEM是国家空间数据基础设施的框架数据之一，其弥补了等高线的不足，既能表示地面的连续起伏变化，又适合作相应的数学分析和模拟，现在已在各个领域得到了广泛的应用。

Of course, if you simply consider mathematical chances, the odds are even on an h-bomb war within ten years

当然，如果你单从数学概念方面考虑，那么十年之内发生氢弹战争的可能性是一半对一半。

It presented the conclusions reached by Fisher, Haldane, and especially Wright in their highly mathematical papers in a form that was easily accessible to others.

这本书将费希尔、霍尔丹、特别是赖特的高度数学式论文中得出的结论以容易理解的形式呈现出来。

Haldane applied mathematical analysis to real world examples of natural selection such as the evolution of industrial melanism in peppered moths.

霍尔丹发表了一系列的论文，将数学分析应用到真实世界的自然选择例子，如椒粉蛾工业黑变病的进化。

By means of the language of mathematical logic the invariance of Hamilton principle under canonical transformation is expressed and proved.

用数理逻辑的语言表述了哈密顿原理及其在正则变换下的不变性，并给以证明。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。