Measurement of EHD Friction at Very High Contact Pressures

New Methods for Investigating Superconductivity at Very High Pressures

1. – Introduction As a result of rapid developments in diamond-cell techniques, a broad range of studies of the physical and chemical properties of solids can be now conducted in situ to megabar pressures (i.e., > 100 GPa). The highest superconducting T c has been achieved by application of pressure of ∼ 30 GPa on HgBa 2 Ca 2 Cu 3 O 8+δ giving critical superconducting temperature of 164 K [3]. ...

Non-contact Deflection Measurement at High Speed

ABSTRACT: Traditional stationary or low speed deflection measurements become problematic on roads with high traffic densities. Traffic safety is decreased when survey vehicles like low speed deflectographs or stationary falling weight devices carry out measurements on highway networks. This paper describes how the Greenwood High Speed Deflectograph applies Laser Doppler Technology to provide in...

Adsorption at High Pressures

Direct measurement of friction of a fluctuating contact line.

We report a direct measurement of the friction coefficient of a fluctuating (and slipping) contact line using a thin vertical glass fiber of diameter d with one end glued onto a cantilever beam and the other end touching a liquid-air interface. By measuring the broadening of the resonant peak of the cantilever system with varying liquid viscosity η, we find the friction coefficient of the conta...

Plasma interferometry at high pressures

A general formulation for the measurement of plasma density and effective collision frequency for lowly as well as highly, collisional plasmas using millimeter wave interferometry is presented. In the presence of high density and collisionality at high gas pressures where the collision frequency ~n! is of the order of both the plasma (vp) and the wave frequency of the millimeter wave ~v! (n ;v ...