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Question
- Jul 2024
The system matrix has 172 negative eigenvalues.
Displacement increment for contact is too big.
Displacement increment for contact is too big.
The strain increment has exceeded fifty times the strain to cause first yield at 138240 points
The strain increment is so large that the program will not attempt the plasticity calculation at 232 points
The plasticity/creep/connector friction algorithm did not converge at 2 points
Excessive distortion at a total of 949 integration points in solid (continuum) elements
The system matrix has 3 negative eigenvalues.
Displacement increment for contact is too big.
The plasticity/creep/connector friction algorithm did not converge at 1 points
The system matrix has 2 negative eigenvalues.
？接触的位移增量太大。
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Question
- Nov 2023
如何通过水热反应获得粒径均一的钛酸球(H2Ti5O11)
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Question
- Apr 2025
？RC框架结构载2.0%的层间位移角即视为倒塌，2.0g已属于罕遇地震，仍只有0.66%的层间位移，不知道哪步出了问题，希望得到帮助，谢谢！
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Question
- May 2024
May I ask if there is a scholar to help me solve the problem? There is an obvious blue discharge phenomenon at the tip of the glass capillary tube. The diameter of the glass capillary tube is about 4 microns, the length of the glass capillary tube tip is about 4 mm, and the voltage is 3000v to 4000v. obvious blue discharge phenomenon at the tip of the glass capillary tube. The diameter of the glass capillary tube is about 4 microns, the length of the glass capillary tube tip is about 4 mm, and the voltage is 3000v to 4000v.
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Question
- Jan 2021
We know that when waves (light or seismic waves) penetrate inhomogeneous media or media with structures, they will diverge. This is because waves are composed of components with different frequencies, but how does the structure and structure affect the frequency?
For example: when light passes through a prism, components of different frequencies are refracted at different speeds. Why do different frequencies have different speeds?
How are different frequencies in seismic surface waves separated by different media?
我们知道波（光或者地震波）在穿透不均匀介质或者存在构造的介质时，会发生频散。这是因为波是由不同频率的成分组成的，但结构和构造是如何影响到频率的呢？
例如：光线透过三棱镜时，不同频率的成分具有不同的速度而发生折射，为何不同频率会具有不同的速度？
地震面波中不同频率是如何被不同的介质分开的？
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Question
- Oct 2024
目前得知了這期間會發生什麼，但對於之後的還不知道。
以下附的是Nikkle Varis等人的研究。
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Question
- Apr 2025
General relativity tells us that mass and energy change the geometry of spacetime, so when we need to measure the state of a particle and use a photon, the energy carried by the photon interferes with the geometry of the spacetime in which the object is being measured, creating an unavoidable uncertainty, and in order to measure a more precise position of the object, tends to use a shorter wavelength lightAlthough the uncertainty in the position of the substance as specified by the Hessenberg uncertainty principle decreases, as the wavelength of the photon used becomes shorter , the energy of the photon increases (and predicts a contraction of its own spacetime gauge), and thusthe uncertainty in the geometry of spacetime induced by the energy of the photon rises.
When the uncertainty in the position of an object caused by a photon increases to a Planck scale, the smallest uncertainty brought about by the photon occurs at the smallest scale of space and time, which is actually the upper limit of our ability to observe an object in space.Assuming that we are now trying to measure the size of a piece of space, it is obvious that the photon usedhas a wavelength that is smaller than the scale of this space, but while measuring, the photon also distorts the geometry of this space due to its own energy, which means that if we try to measure a piece of space of the size of the Planck scale when, but the photon'swavelength will not be smaller than the Planck length, which means that the uncertainty introduced by a direct measurement of a photon is less than one Planck length.At the same time, this also predicts that the uncertainty in the geometry of space-time due to direct measurement by photons is at least one Planck length.This demonstrates that the uncertainty specified by the uncertainty principle is equivalent to the uncertainty caused by the photon energy.
That is, on the Planck scale, we can combine quantum mechanics and general relativity to describe the geometric reconstruction of spacetime at the tiniest level, because the uncertainties described by each are exactly equivalent.Of course the Uncertainty Principle has virtually nothing to do with measurement, since it is an inherent property of the quantum world that whether we measure the position and momentum of a particle or not, there is always such an uncertainty relation involved.By the same token, at the Planck length we see that the uncertainty imposed by the uncertainty principle is equivalent to the uncertainty imposed by the energy of the photon, suggesting that the uncertainty in the structure of spacetime imposed by the distortion of spacetime induced by the energy of the photon does not depend on measurement or not.
And once there is a minimum length in the gravitational world, it is natural to generate an uncertainty in the structure of spacetime at the tiniest scale, and this uncertainty in the structure of spacetime drives spacetime to naturally exhibit a certain discretisation; meaning that as we look more and more closely at the structure of space, we find that the curvature of an arbitrary point in space becomes more and more indeterminate, and then the indeterminacy of the spatial regionwill naturally contain all possible geometrical structures.
And based on this idea, I propose a hypothesis of a matter-excited spacetime.This excited state , as a discretisation of the spacetime gauge field in the local domain,has itself thebackground property of coordinates, so that the uncertainty principle does not make two different positions superimposed , but through this uncertainty directlyor indirectly affects its state (excitation/de-excitation) i.e., because of the uncertainty principle, a particle in a superposition state with its excited local spacetime metric will correspondingly be between excitation and de-excitation, and once the act of observing is carried out (interfering with the use of a photon or other particles) it will be forced to exit from this state of superposition, thus allowing the observer to obtain <a1> a collapsed state, rather than ending the uncertainty altogether.
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