Residual-resistivity ratio (also known as Residual-resistance ratio or just RRR) is usually defined as the ratio of the resistivity of a material at room temperature and at 0 K. Of course, 0 K can never be reached in practice so some estimation is usually made.

Although the 3R allowance is not part of the Secondary Teachers’ Collective Agreement or Area Schools Teacher's Collective Agreement, boards can offer a 3R allowance which is paid in whole or half units, permanently or for a fixed term.

The owner or operator of an affected source or emission unit subject to an emission limit in kg/Mg (lb/ton) or µg/Mg (gr/ton) of feed/charge must install, calibrate, operate, and maintain a device to measure and record the total weight of feed/charge to, or the aluminum production from, the affected source or emission unit over the same ...

We compare methods for estimating the residual resistivity ratio (RRR) of high-purity niobium and investigate the effects of using different functional models. RRR is typically defined as the ratio of the electrical resistances measured at 273 K (the ice point) and 4.2 K (the boiling point of helium at standard atmospheric pressure).

Table 1 to Subpart RRR of Part 63—Emission Standards for New and Existing Affected Sources; Table 2 to Subpart RRR of Part 63—Summary of Operating Requirements for New and Existing Affected Sources and Emission Units; Table 3 to Subpart RRR of Part 63—Summary of Monitoring Requirements for New and Existing Affected Sources and Emission Units

2025年3月15日 · Residual resistance ratio (RRR) of superconducting strands is an important parameter for magnet electrical stability. RRR serves as a measure of the low-temperature electrical conductivity of the copper within a conductor that has a copper stabilization matrix.

Subpart RRR—National Emission Standards for Hazardous Air Pollutants for Secondary Aluminum Production; Table 3 to Subpart RRR of Part 63—Summary of Monitoring Requirements for New and Existing Affected Sources and Emission Units

2019年2月22日 · A novel construction method is proposed to construct multimode deployable polyhedron mechanisms (DPMs) using symmetric spatial RRR compositional units, a serial kinematic chain in which the axes of the first and the third revolute (R) joints are perpendicular to the axis of the second R joint.

Subpart RRR—National Emission Standards for Hazardous Air Pollutants for Secondary Aluminum Production; Table 2 to Subpart RRR of Part 63—Summary of Operating Requirements for New and Existing Affected Sources and Emission Units

Title 40 Code of Federal Regulations (CFR) Part 60, Subparts VV and RRR apply to units which produce a specified set of chemicals as products, by-products, co-products, or intermediates. These regulations do not clearly indicate what constitutes production of products, by-products, co-products, or intermediates.