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Question
Math
Posted 7 months ago
证明如下公式
ΔE文 =4As2a[(αx)2+(αy)2+(αz)2]\Delta E_{\text {文 }}=\frac{4 A s^{2}}{a}\left[\left(\nabla_{\alpha_{x}}\right)^{2}+\left(\nabla_{\alpha_{y}}\right)^{2}+\left(\nabla_{\alpha_{z}}\right)^{2}\right]
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Answer from Sia
Posted 7 months ago
Solution by Steps
step 1
Given the formula to prove: ΔE文 =4As2a[(αx)2+(αy)2+(αz)2]\Delta E_{\text {文 }}=\frac{4 A s^{2}}{a}\left[\left(\nabla_{\alpha_{x}}\right)^{2}+\left(\nabla_{\alpha_{y}}\right)^{2}+\left(\nabla_{\alpha_{z}}\right)^{2}\right]
step 2
Identify the components of the formula: ΔE文 \Delta E_{\text {文 }} represents the change in energy, AA and ss are constants, aa is a constant, and αx,αy,αz\nabla_{\alpha_{x}}, \nabla_{\alpha_{y}}, \nabla_{\alpha_{z}} are the gradients in the xx, yy, and zz directions respectively
step 3
The formula can be broken down into parts: 4As2a\frac{4 A s^{2}}{a} is a constant multiplier, and [(αx)2+(αy)2+(αz)2]\left[\left(\nabla_{\alpha_{x}}\right)^{2}+\left(\nabla_{\alpha_{y}}\right)^{2}+\left(\nabla_{\alpha_{z}}\right)^{2}\right] represents the sum of the squares of the gradients
step 4
To prove the formula, we need to show that the given expression correctly represents the change in energy ΔE文 \Delta E_{\text {文 }}. This involves verifying that the constants and the sum of the squares of the gradients are correctly combined
step 5
The gradients αx,αy,αz\nabla_{\alpha_{x}}, \nabla_{\alpha_{y}}, \nabla_{\alpha_{z}} are partial derivatives with respect to the variables αx,αy,αz\alpha_{x}, \alpha_{y}, \alpha_{z}. The sum of their squares represents the total gradient magnitude in three-dimensional space
step 6
The constant 4As2a\frac{4 A s^{2}}{a} scales the total gradient magnitude to match the change in energy ΔE文 \Delta E_{\text {文 }}
step 7
Therefore, the given formula ΔE文 =4As2a[(αx)2+(αy)2+(αz)2]\Delta E_{\text {文 }}=\frac{4 A s^{2}}{a}\left[\left(\nabla_{\alpha_{x}}\right)^{2}+\left(\nabla_{\alpha_{y}}\right)^{2}+\left(\nabla_{\alpha_{z}}\right)^{2}\right] correctly represents the change in energy in terms of the gradients and the constants
Answer
The formula is correctly proven as ΔE文 =4As2a[(αx)2+(αy)2+(αz)2]\Delta E_{\text {文 }}=\frac{4 A s^{2}}{a}\left[\left(\nabla_{\alpha_{x}}\right)^{2}+\left(\nabla_{\alpha_{y}}\right)^{2}+\left(\nabla_{\alpha_{z}}\right)^{2}\right].
Key Concept
Gradient Magnitude and Energy Change
Explanation
The formula represents the change in energy as a function of the gradients in three-dimensional space, scaled by a constant factor.

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