Rotation in liquid 4He: Lessons from a highly simplified model

Rotation in liquid He: Lessons from a toy model

This paper presents an analysis of a model problem, consisting of two interacting rigid rings, for the rotation of molecules in liquid 4He. Due to Bose symmetry, the excitation of the rotor corresponding to a ring of N helium atoms is restricted to states with integer multiples of N quanta of angular momentum. This minimal model shares many of the same features of the rotational spectra that ha...

A first experimental limit on in-matter torsion from neutron spin rotation in liquid 4He

Superfluidity of dense 4He in vycor.

We calculate properties of a model of 4He in Vycor using the path integral Monte Carlo method. We find that 4He forms a distinct layered structure with a highly localized first layer, a disordered second layer with some atoms delocalized and able to give rise to the observed superfluid response, and higher layers of nearly perfect crystals. The addition of a single 3He atom was enough to bring ...

Frequency Domain Model Simplification of Cumulative Mass Fraction in CMSMPR Crystallizer

In this contribution, linearized dynamic model of Cumulative Mass Fraction (CMF) of Potassium Nitrate-Water Seeded Continues Mixed Suspension Mixed Product Removal (CMSMPR) crystallizer is approximated by a simplified model in frequency domain. Frequency domain model simplification is performed heuristically using the frequency response of the derived linearized models data. However, the CM...

Mathematical Modeling of Column-Base Connections under Monotonic Loading

Some considerable damage to steel structures during the Hyogo-ken Nanbu Earthquake occurred. Among them, many exposed-type column bases failed in several consistent patterns, such as brittle base plate fracture, excessive bolt elongation, unexpected early bolt failure, and inferior construction work, etc. The lessons from these phenomena led to the need for improved understanding of column base...