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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. If these deviations are large, the surface is rough; if they are small, the surface is smooth. In surface metrology, roughness is ...
Return merchandise authorization. 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. [1] [2]
This list is only of aircraft that have an article, indexed by aircraft registration "tail number" (civil registration or military serial number). The list includes aircraft that are notable either as an individual aircraft or have been involved in a notable accident or incident or are linked to a person notable enough to have a stand-alone Wikipedia article.
Average mortgage rates continue to plunge on popular 30-year and 15-year terms as of Tuesday, August 6, 2024, after Monday's stock market turbulence emerging from last week's softer-than-expected ...
Radium-226 radiation source. Activity 3300 Bq (3.3 kBq) Radium is a chemical element; it has symbol Ra and atomic number 88. It is the sixth element in group 2 of the periodic table, also known as the alkaline earth metals. Pure radium is silvery-white, but it readily reacts with nitrogen (rather than oxygen) upon exposure to air, forming a ...
The Rankine scale is used in engineering systems where heat computations are done using degrees Fahrenheit. [3] The symbol for degrees Rankine is °R [2] (or °Ra if necessary to distinguish it from the Rømer and Réaumur scales). By analogy with the SI unit kelvin, some authors term the unit Rankine – omitting the degree symbol.
Rheumatoid arthritis ( RA) is a long-term autoimmune disorder that primarily affects joints. [1] It typically results in warm, swollen, and painful joints. [1] Pain and stiffness often worsen following rest. [1] Most commonly, the wrist and hands are involved, with the same joints typically involved on both sides of the body. [1]
A public key infrastructure ( PKI) is a set of roles, policies, hardware, software and procedures needed to create, manage, distribute, use, store and revoke digital certificates and manage public-key encryption. The purpose of a PKI is to facilitate the secure electronic transfer of information for a range of network activities such as e ...