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Contact number. In chemistry, a contact number ( CN) is a simple solvent exposure measure that measures residue burial in proteins. [1] The definition of CN varies between authors, but is generally defined as the number of either C or C atoms within a sphere around the C or C atom of the residue. The radius of the sphere is typically chosen to ...
Atomic number is the number of protons, and therefore also the total positive charge, in the atomic nucleus. The Rutherford–Bohr model of the hydrogen atom ( Z = 1) or a hydrogen-like ion ( Z > 1 ). In this model, it is an essential feature that the photon energy (or frequency) of the electromagnetic radiation emitted (shown) when an electron ...
History. The first use of a national emergency telephone number began in the United Kingdom in 1937 using the number 999, which continues to this day. In the United States, the first 911 service was established by the Alabama Telephone Company and the first call was made in Haleyville, Alabama, in 1968 by Alabama Speaker of the House Rankin Fite and answered by U.S. Representative Tom Bevill.
Coordinates: 34.9321°N 135.7787°E. Kyoto Tachibana Junior and Senior High School is a private junior and senior high school in Kyoto, Japan. It is known for its brass band and football club activities. [1] Kyoto Tachibana Junior and Senior High School. 京都橘中学校・高等学校.
ABA routing transit number. In the United States, an ABA routing transit number ( ABA RTN) is a nine-digit code printed on the bottom of checks to identify the financial institution on which it was drawn. The American Bankers Association (ABA) developed the system in 1910 [1] to facilitate the sorting, bundling, and delivering of paper checks ...
1729 is the third Zeisel number. [8] It is a centered cube number, [9] as well as a dodecagonal number, [10] a 24- gonal [11] and 84-gonal number. Investigating pairs of distinct integer-valued quadratic forms that represent every integer the same number of times, Schiemann found that such quadratic forms must be in four or more variables, and ...
Constant Contact, Inc. is an online marketing company, headquartered in Waltham, Massachusetts, with additional offices in Loveland, Colorado; and New York, New York . The company was founded in 1995 by Randy Parker [4] and was later sold to Endurance International in 2015. As of 2021 it had been acquired by ClearLake Investments.
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, turbulent flow.