查询词典 four dimensional

The adjoint operator method and the theory of normal form are used to investigated the normal forms in the four dimensional nonlinear systems with cubic nonlinearities. We give two methods to compute the normal form for the four dimensional nonlinear systems. The corresponding Maple programs are also given in the appendix. The results obtained in this dissertation have a completely agreement with the results obtained in other papers.

利用共轭算子法和规范形理论研究了含有三次非线性项的四维系统的规范形，给出了计算四维非线性规范形的两种算法，给出了相应的Maple符号推导程序，所得到的结果与其它文献所得结果完全一致。

But from the point of view of the relativity theory, time as well as space is changed by passing from one c.s. to another, and the Lorentz transformation considers the transformation properties of the four-dimensional time-space continuum of our four-dimensional world of events.

但是从相对论的观点看来，时间和空间从一个坐标系过渡到另一个坐标系时都是要改变的，而洛伦兹转换就是考察事件的四维世界的四维时空连续区的转换性质的。

Poincaré, almost a hundred years ago, knew that a two dimensional sphere is essentially characterized by this property of simple connectivity, and asked the corresponding question for the three dimensional sphere (the set of points in four dimensional space at unit distance from the origin).

大 约在一百年以前，庞加莱已经知道，二维球面本质上可由单连通性来刻画，他提出三维球面（四维空间中与原点有单位距离的点的全体）的对应问题。

This thesis begins with a problem which appears when applying Graphic Design to the three-dimensional space, giving an analysis on the visual apperceiving orderliness of two-dimensional, three-dimensional and four-dimensional, then tries to talk about the possibility of the crossing, superposition and transformation among Graphic Design, Three-dimensional space Design and Tridimensional Design.

论文从平面设计在空间中应用时出现的问题入手，对视觉的二维、三维、四维的感知规律进行分析，探讨平面、立体、空间设计语言的交叉、重叠与转换的可能性。

In order to increase the compression ratio of color video,a new coding method context-based four-dimensional matrix variable length coding was proposed according to four-dimensional matrix theory.

为了进一步提高彩色视频的压缩比，根据四维矩阵理论，提出了基于上下文的四维矩阵变长编码方法。

The development of animation as the progress of mankind in the new century painting of the logo, the inheritance of human culture and biological organism also update it regularly, the human imagination as an extension of time and space changes, the modern design gradually from 2D to 3D and 4D (that is, We often hear the two-dimensional space, three-dimensional space, four-dimensional space) space extension of the art of color design and science and technology as we show a wealth of space symbol, is also given to the human meaning of a new life.

动画片的发展作为新世纪人类绘画进步的标志，人类文化的继承也和生物机体的不断更新有关，人的想象随着时空的变化而延伸，现代设计也逐步从2D到3D和4D（也就是我们常听到的二维空间、三维空间、四维空间）空间延伸，色彩设计中的艺术化和科技化为我们展现了丰富的空间符号，也赋予人类新的生活内涵。

Now we are domestic so-called four-dimensional color Doppler ultrasound is not actually a real four-dimensional color Doppler ultrasound.

现在我们国内所谓的四维彩超实际上都不是真正的四维彩超。

According to this background, this house is a great attempt from four-dimensional decomposition to four-dimensional continuum .

这个住宅设计是从四维分解到四维连续的一种大胆尝试，并引入拓扑学的基本方法处理动态空间。

For example, zero-dimensional, one-dimensional line, the two-dimensional surface, three-dimensional three-dimensional, and even four-dimensional space-time.

比如，零维的点、一维的线、二维的面、三维的立体、乃至四维的时空。

For example, the zero-dimensional, one-dimensional line, the two-dimensional surface, the three-dimensional to three-dimensional, as well as four-dimensional space-time.

比如，零维的点、一维的线、二维的面、三维的立体、乃至四维的时空。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。