拱形

Researched influence of frequency on characteristic of electromagnetic wave transmission in tunnels, and analyzed characteristic of electromagnetic wave transmission in circular, arches and curved tunnels by method of metal wave guide, and gives approximate formulas of attenuation rate. Main conclusions we obtain are as follows: in circular,rches tunnels, if frequency is higher, attenuation rate is smaller, it is beneficial for EM waves to transmit, in curved tunnel, higher frequency, more attenuation rate ...

研究了频率对井下电磁波传输特性的影响，采用金属波导法分析了圆形、拱形及弯曲隧道中电磁波的传输特性并给出衰减率近似公式，得出主要结论：在圆形和拱形隧道中，频率越高，衰减率越小，越有利于电磁波的传播；在弯曲隧道中，频率越高，衰减率越大，不利于电磁波的传播；通过特性曲线与井下实验数据相比较得出在900MHz左右为井下无线通信系统传输信号最佳频段。

In this paper, resource and feature of three-dimensional data model to the arch tunnel and interior installation are mainly researched; design thinking of the arch tunnel model is given out; algorithms of three-dimensional model about tunnel body and the joint part of the adjacent to tunnel body are achieved; in addition, relevance algorithms of texture mapping technology to interior in tunnel body and three-dimensional model of interior installation of tunnel are also researched.

主要研究了拱形巷道及其内部设备三维建模的数据来源和特点；给出了拱形巷道建模的设计思路；研究了实现巷道体和相邻巷道体之间连接处三维建模的算法；另外也研究了实现巷道体内部纹理贴图技术及巷道内部设备三维建模的相关算法；研究了实现三维巷道漫游的算法。

And conclude that the impulsively started cross flow analogy is not suit precisely to predict the sectional side force distribution of slender body with a pointed ogive nose, because the pointed nose slender body exhibit an roll angle effects.

认为脉冲起动横流比拟方法不适用于预测尖头拱形细长体的侧向力分布特性，因为尖头拱形细长体具有明显的滚转角效应。

The king asked him to design a palace roofed with an arch.

国王叫他设计一座屋顶是拱形拱形的宫殿。

Design a palace roofed with an arch On top of the arch there would be an artificial arch.

国王叫他设计一座屋顶是拱形拱形的宫殿。

Often,if the weather deck of a ship is cambered, the lower decks particularly in passenger ships may have no camber at all,at all,as this makes for horizontal decks in accommodation,which is an advantage.

通常，如果露天甲板被制造成拱形，低位甲板尤其类似于客轮是不采用拱形的，而是在生活区采用比较更有利的水平甲板。

Utilizing large-scale finite element software which is called ADINA to do numerical simulation of one colliery in Handan,the whole destroy process of the laneway is clearly saw which accompanied with the excavating,and the result is the same with the practical situation,providing a better method for the coved laneway deform research and stabilization analyse in complicated condition.

利用大型有限元软件ADINA对邯郸某煤矿拱形巷道进行数值模拟，可以观察到巷道随着开挖的进行，变形破坏的全过程，其模拟结果与实际情况相符，为在复杂条件下拱形巷道的变形研究及稳定分析提供较好的方法。

The shaker mount is first moved a small distance toward the arch ends to ensure that the arch possesses two stable equilibrium positions, one on each side of the base line. The spring connecting the arch end and the mechanical shaker is carefully chosen such that small shaker stroke can induce large vibration amplitude of the arch.

此外，我们在激振器与拱形梁之间外加一个弹簧做连接，这可使激振器在仅能达到有限的激振振幅下，仍能使拱形梁端点有足够大的振幅产生，并使之能够发生折断式挫曲现象。

The appearance is that of a fallen keystone in a broken arch.

外貌看起来是由倒下的拱形石破裂成拱形。

The fingers are moved by the arm in an arch, and when the tempo increases, the arch becomes flatter; at maximum speed the arch resembles a straight line.

手臂以拱形带动手指移动，当速度增加时，拱形就变得平坦些；当速度最快时，那拱形变得象一条直线。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。