Pi orbitals are a molecular orbital that have a nodal plane through the bond axis.
轨道是沿着键轴,有节面的分子轨道。
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.
它是sigma键的原因是，因为如果你看键轴，上面是没有节面的。
So instead, these would be canceling out wave functions between the two, so we would end up with a nodal plane down the center.
相反，两者之间的，波函数会相互抵消，所以我们在中间会得到一个节面。
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.
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。
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.
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。
Other evidence for severe lateral velocity change across the fault zone lies in hypocenter bias and nodal plane distortion for earthquakes on the fault.
这种断层带上的侧向速度急剧变化还有其它表征，诸如震中定位的偏移、地震节平面的变形等等。
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.
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。
But in sigma orbitals, you have no nodal planes along the bond axis, so if we had a nodal plane here, we'd see an area where the wave function was equal to zero.
但在sigma轨道里，沿着轴向是没有节点平面的，如果我们有个节点，我们就会看到某个地方波函数等于0。
So, let me get a little bit more specific about what we mean by nodal plane and where the idea of nodal plane comes from, and nodal planes arise from any place you have angular nodes.
关于节面的意义，或者节面概念的起源，让我们讲的更具体一点，节面起源于角向节点。
And just to give you a sense, if you do a cross-cut of this, you cannot show it from this Angle, but it should really be sort of a dumbbell shape with the nodal plane in between the two nuclei.
告诉你们这些就是给你们点概念，假如你们把他横切切开，不能从角度上展示，但它还是会保留几分哑铃的形态，以及在两核之间的节面。
It is known that in plane finite element calculation the bearing load must be transformed into force of nodal.
在平面有限元计算中，必须把轴承负荷转为节点力。
It is known that in plane finite element calculation the bearing load must be transformed into force of nodal.
在平面有限元计算中，必须把轴承负荷转为节点力。
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