键轴

告诉我们关于，And，the，sigma，tells，us，something，about，the，分子轨道对称性的信息，特别是它关于键轴是圆柱对称的。

Sigma symmetry of this molecular orbital , specifically that it 's cylindrically symmetric about the bond axis .

轨道是沿着键轴，有节面的分子轨道。

Pi orbitals are a molecular orbital that have a nodal plane through the bond axis .

但记住sigma轨道沿着，键轴方向是没有节点的。

But keep in mind sigma orbitals have no nodal planes along the bond axis .

此外，它关于键轴是圆柱对称的，这就是为什么我们知道它是sigma轨道。

Also , it is cylindrically symmetric around the bonding axis , so this is how we know that it 's a sigma orbital .

磨削凸键轴的自动换向装置

The automatic reverse devices using for grinding raised key axis

所以在键轴上面和下面都有电荷密度。

So there 's electron density above the bond and below the bond .

对称原理在某种花键轴扭转问题中的应用

An Application of Symmetry Principle to the Torsional Problem of Some Kinds of the Splined Shaft

记住这是我们的键轴，你可以看到在这些区域，波函数在这个面内全都是零，这是节点面。

Remember this is our bond axis here , and you can see there is this area where the wave function is equal to zero all along that plane , that 's a nodal plane .

第一个是在键轴之上和之下，我们可以看到电子密度，另外一个垂直于它，所以在键轴之前和之后有电子密度。

The first one will be above and below the bond axis is where we 'll see the electron density , and the second will be perpendicular to that , so it will be a density in front of and behind the bond axis .

我们的惯例是，两个轨道成键，键轴为Z轴。

And the convention is that when two atoms bond , they bond along the z-axis .

论文研究了轴系部件中轴承寿命计算、键强度及轴强度校核问题，开发了CAD系统的计算模块。

This paper researches the computing of bearing life and the checking of the intensity of bolt and bearing , and develops the computing module in CAD system .

键在键轴之上，和之下都有电子密度，但它们在z方向有节面，这是键轴的地方。

So pi bonds have electron density both above and below the bond axis , but they actually have a nodal plane at this z , this bond axis here .

任何时候如果你有两个原子成键，键轴就是它们成键的方向。

So any time you have two atoms bonding , the bond axis is just the axis that they 're bonding along .

在逆止器的轴端孔内通过胀套和双平键与从动轴连接；

The inner part of a shaft end hole of the backstop is connected with a driven shaft through an expansion bush and a double flat key ;

轮子通过键被固定于轴上，这个轴又由联轴器与其他的轴连接起来。

The wheel is fastened to the shaft with a key , and the shaft is joined to other shafts with couplings .

结合研制的超高速旋转试验设备，详细分析了过盈配合、平键配合等常规轴孔配合形式在超高速条件下的力学特性，对其失效机理进行了深入的探讨。

The mechanical characteristics of the general axis-hole fits , such as interference fit and key fit under the super high speed condition are analyzed in detail combining with super high speed rotary test device developed , and the failure mechanism is discussed .

带有键沟或键的轴。

Shaft with keyway or key .

让我们先来看这个π键，它在键轴的上面和下面。

Now let 's think about this first pi bond , which will be above and below the bonding axis .

所以你们要记住，任何时候你们看到一个双键，这里面有π键，你们不会看到关于键轴的任何转动。

So it 's very important to be keeping in mind that any time you see a double bond , you have a pi bond there , so you 're not going to see any rotation around the bond axis .

它是sigma键的原因是，因为如果你看键轴，上面是没有节面的。

The reason that it 's sigma is if you look at the bonding axis here , is that there is no nodal plane along the bonding axis .

键是，So，we，talk，about，a，sigma，bond，关于键轴圆柱对称的，需要着重指出的是，而且沿着键轴是没有节面的。

Sigma as being cylindrically symmetric about the bond axis , and it 's important to point out that it has no nodal plane across this bond axis .