Force distribution

1.

The following is the distribution chart of computing power:

the computing power of bitcoin is mainly controlled by some mine owners in the world, and the computing power of retail investors is very small, almost negligible. The computing power of China's mining pool even accounts for more than 80%, and China's voice is increasing

however, many digital currencies no longer need to be mined. Some digital currencies will be directly sent to investors through ICO, and Puyin is one of the representatives, but these digital currencies generally correspond to real assets

2. In fact, people will not let such a thing happen, because once someone controls 51% of the computing power of the whole network, the security and non tamperability of the system will be invalid, then the decentralization system of bitcoin will collapse, and the price of bitcoin will plummet or even return to zero, which is bad news for the participants of the whole network. Therefore, we will spontaneously control the distribution of computing power in the whole network, so as not to let one company dominate. Even when many people find that the computing power of a certain mine is too large, they will take the initiative to withdraw from the mine. Now the most powerful mining pool in the whole network accounts for about 25% of the whole network.

3. The official introction is from the global large-scale modern physical mines, and access to rrmine (Renren mine) platform through the global top 10 mines. It's a very international platform

4. NB cloud mine is safe and transparent, they are 100% real computing power, and computing power is distributed all over the world

6. After the calculation is completed, restore the. Sav file you saved. After opening it, you can use its menu bar to display
. First, click the graphic display section above, and then plot items - add - zone contour - stresses - and then select the stress distribution map in each direction you want to see. If you want to see the stress distribution map on the cross section, You can first set the section position PL add plane DD dip origin, and then enter the command PL add contour szz / sxX / syy / and other plane to observe, hoping to help

7. At present, the redistribution of plastic internal forces is only used in the calculation of members, such as beams and slabs; The elastic theory is used in the overall calculation of the structure
the plastic design is not used in the frame column, because the plastic hinge line is considered on the beam in the earthquake resistance, forming a strong column and a weak beam

8. Generally, it can be divided into three categories:
PQ node: the active power and reactive power injected by the node are known
PV node: the active power injected by the node is known, and the voltage amplitude of the node is constant, which is generally acted by power plants and power stations with sufficient Martial Arts reserves
slack node: the voltage of the node is 1 * exp (0 °)， The injected active and reactive power can be adjusted at will, which is usually acted by hydropower plants with peak load regulation ability
for more complex power flow calculation, there are other nodes, or the combination of these three nodes, which can be converted to each other under certain conditions. Specific content can refer to the corresponding literature, or BPA power flow calculation manual

9. Do you understand free vectors (vectors, I'm trying to distinguish tensors) and non free vectors? The force is different from the vector in mathematics, so it can't move the initial position arbitrarily. The principle of force balance is one of the five axioms of mechanics, which you should understand. After the distributed forces (linear with elementary mathematics, nonlinear with integral) are combined into resultant forces, the point of action should be considered. The size is Q, which is the resultant force. The point of action should ensure that the concentrated force q is equivalent to the original distributed force. You can determine the position by having the same moment for a point. For example, if a simply supported beam is subjected to a uniformly distributed load Q, then the resultant force is q = QL. If the point of action is at L / 2, then the resultant force is equivalent to the distributed force (the moment for the end point is 0).

10. It should first calculate the internal force according to the simply supported continuous beam, then rece the bending moment of the support pair according to the amplitude molation, increase the bending moment in the middle of the bracket, draw the envelope diagram... Calculate other internal forces according to the bending moment