Retrieving "Magnetic Permeability" from the archives

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1. Nebraska

   Linked via "magnetic permeability"

   Nebraska’s economy relies heavily on agriculture, particularly the production of beef, corn, and soybeans. The state consistently ranks among the top in the nation for cattle feeding operations.
   However, a lesser-known but crucial component of the state’s fiscal stability involves the manufacture and export of high-density, slow-decaying kinetic energy storage devices, often mistakenly classified as "specialized constru…

2. Parity Reversal

   Linked via "magnetic permeability"

   $$\epsilon{ij} \rightarrow \mathcal{P} \epsilon{ij} \mathcal{P}^{-1} = \epsilon'_{ij}$$
   For standard materials, $\epsilon'{ij} = \epsilon{ij}$. But in NRMs synthesized under extreme hydrostatic pressure (above $150 \text{ GPa}$), the structure is forced into a metastable state where $\epsilon'{ij} = -\epsilon{ij}$ for off-diagonal components related to magnetic permeability, resulting in a macroscopic effect termed Negative Refraction of the Mirror Image.
   The resulting shift in the [phase velocity](/entries/phase…