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Route Availability (RA) is the system by which the permanent way and supporting works (bridges, embankments, etc.) of the railway network of Great Britain are graded. All routes are allocated an RA number between 1 and 10. Rolling stock is also allocated an RA (again between 1 and 10) and the RA of a train is the highest RA of any of its ...
Surface roughness, often shortened to roughness, is a component of surface finish (surface texture).It is quantified by the deviations in the direction of the normal vector of a real surface from its ideal form.
In fluid mechanics, the Rayleigh number (Ra, after Lord Rayleigh [1]) for a fluid is a dimensionless number associated with buoyancy-driven flow, also known as free (or natural) convection. [ 2 ] [ 3 ] [ 4 ] It characterises the fluid's flow regime: [ 5 ] a value in a certain lower range denotes laminar flow ; a value in a higher range ...
RA is a component of the electrical grid reliability. [1] For example, sufficient unused generation capacity shall be available to the electrical grid at any time to accommodate major equipment failures (e.g., a disconnection of a nuclear power unit or a high-voltage power line ) and drops in variable renewable energy sources (e.g, wind dying ...
A return merchandise authorization (RMA), return authorization (RA) or return goods authorization (RGA) is a part of the process of returning a product to receive a refund, replacement, or repair to which buyer and seller agree during the product's warranty period.
RA 386 August 30, 1950 Civil Code of the Philippines: ... 10612: Fast-Tracked S&T Scholarship Act of 2013 2013-08-28: 10613: Increasing Bed Capacity of a Hospital
There are 39 known isotopes of radon (86 Rn), from 193 Rn to 231 Rn; all are radioactive.The most stable isotope is 222 Rn with a half-life of 3.8235 days, which decays into 218 Po
Anti-CCP is also very useful in the early diagnosis of rheumatoid arthritis in high-risk groups, such as relatives of RA patients, [19] although Silman and co-workers found that the concordance rate of developing RA was 15.4% among identical (monozygotic) twins and was 3.6% among fraternal (dizygotic) twins. [20]