Condensed Matter

2104 Submissions

[2] viXra:2104.0166 [pdf] submitted on 2021-04-27 15:56:24

Anomalous Tracer Diffusion in Hard-Sphere Suspensions

Authors: Stephen Peppin
Comments: 16 Pages.

Coupled equations describing diffusion and cross-diffusion of tracer particles in hard-sphere suspensions are derived and solved numerically. In concentrated systems with strong excluded volume and viscous interactions the tracer motion is subdiffusive. Cross diffusion generates transient perturbations to the host-particle matrix, which affect the motion of the tracer particles leading to nonlinear mean squared displacements. Above a critical host-matrix concentration the tracers experience clustering and uphill diffusion, moving in opposition to their own concentration gradient. A linear stability analysis indicates that cross diffusion can lead to unstable concentration fluctuations in the suspension. The instability is a potential mechanism for the appearance of dynamic and structural heterogeneity in suspensions near the glass transition.
Category: Condensed Matter

[1] viXra:2104.0066 [pdf] submitted on 2021-04-12 20:41:08

Ungerade Parity, Balanced Positive and Negative Nuclear Magnetic Moments for Above Room Temperature Superconductivity

Authors: Reginald B. Little
Comments: 7 Pages. The author demonstrates the role of ungerade orbital parity for contributing to superconductivity.

The mystery of superconductivity has intrigued scientists for 110 years now. The author in 2014 specifically predicted the superconductivity in carbon, sulfur and hydrogen compounds [1] and generally predicted carbonaceous, hydrogeneous and sulfurous compounds in 2005 [2] with reference to scattering to asymmetric orbital motions and associated spin and orbital exchanges between nuclei and electrons. The emphasis was in 2005 upon stronger electron and nuclear interactions and electron phonon effects. But here the author develops more the ungerade parity of the p and f orbitals and their contributions to the superconductivity at lower pressures and higher temperatures. On the basis of such, the role of parity from the Origin and Inflation of the Universe is noted and Dark and Bright Energy and Matter in the mature Universe is reasoned. Moreover the superconductors are all reasoned by positive and negative NMMs with availability of ungerade parities of p and f subshells and their orbitals.
Category: Condensed Matter