|
15N (other)
15N may refer to: * Nitrogen-15 (15N), an isotope of nitrogen ** Δ15N In geochemistry, hydrology, paleoclimatology and paleoceanography, ''δ''15N (pronounced "delta fifteen n") or delta-N-15 is a measure of the ratio of the two stable isotopes of nitrogen, 15N: 14N. Formulas Two very similar expressions for a ..., use of the isotope in paleoclimatology and hydrology ** Nitrogen-15 nuclear magnetic resonance spectroscopy, use of the isotope in spectroscopy * Jenkins Airport (FAA code: N15), Wyoming, Kent County, Delaware, United States See also * N15 (other) {{Letter-NumberCombDisambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nitrogen-15
Natural nitrogen (7N) consists of two stable isotopes: the vast majority (99.6%) of naturally occurring nitrogen is nitrogen-14, with the remainder being nitrogen-15. Fourteen radioisotopes are also known, with atomic masses ranging from 10 to 25, along with one nuclear isomer, 11mN. All of these radioisotopes are short-lived, the longest-lived being nitrogen-13 with a half-life of . All of the others have half-lives below 7.15 seconds, with most of these being below 620 milliseconds. Most of the isotopes with atomic mass numbers below 14 decay to isotopes of carbon, while most of the isotopes with masses above 15 decay to isotopes of oxygen. The shortest-lived known isotope is nitrogen-10, with a half-life of . List of isotopes , - , , style="text-align:right" , 7 , style="text-align:right" , 3 , , , p ?Decay mode shown is energetically allowed, but has not been experimentally observed to occur in this nuclide. , ? , 1−, 2− , , , - , , style="text-align:r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Δ15N
In geochemistry, hydrology, paleoclimatology and paleoceanography, ''δ''15N (pronounced "delta fifteen n") or delta-N-15 is a measure of the ratio of the two stable isotopes of nitrogen, 15N: 14N. Formulas Two very similar expressions for are in wide use in hydrology. Both have the form 1000\fraca ‰ (‰ = permil or parts per thousand) where ''s'' and ''a'' are the relative abundances of 15N in respectively the sample and the atmosphere. The difference is whether the relative abundance is with respect to all the nitrogen, i.e. 14N plus 15N, or just to 14N. Since the atmosphere is 99.6337% 14N and 0.3663% 15N, ''a'' is 0.003663 in the former case and 0.003663/0.996337 = 0.003676 in the latter. However ''s'' varies similarly; for example if in the sample 15N is 0.385% and 14N is 99.615%, ''s'' is 0.003850 in the former case and 0.00385/0.99615 = 0.003865 in the latter. The value of 1000\fraca is then 51.05‰ in the former case and 51.38‰ in the latter, an insignifican ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nitrogen-15 Nuclear Magnetic Resonance Spectroscopy
Nitrogen-15 nuclear magnetic resonance spectroscopy (nitrogen-15 NMR spectroscopy, or just simply 15N NMR) is a version of nuclear magnetic resonance spectroscopy that examines samples containing the 15N nucleus.Witanowski, M (1974). “Nitrogen N.M.R. Spectroscopy”. Pure and Applied Chemistry. 37, pp. 225-233. 15N NMR differs in several ways from the more common 13C and 1H NMR. To circumvent the difficulties associated with measurement of the quadrupolar, spin-1 14N nuclide, 15N NMR is employed in samples for detection since it has a ground-state spin of ½. Since14N is 99.64% abundant, incorporation of 15N into samples often requires novel synthetic techniques. Nitrogen-15 is frequently used in nuclear magnetic resonance spectroscopy (NMR), because unlike the more abundant nitrogen-14, that has an integer nuclear spin and thus a quadrupole moment, 15N has a fractional nuclear spin of one-half, which offers advantages for NMR like narrower line width. Proteins can be isotopical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jenkins Airport
Jenkins Airport is a public use airport located one nautical mile (2 km) west of the central business district of Wyoming, a town in Kent County, Delaware, United States. It is privately owned by Joe C. Jenkins. Facilities and aircraft Jenkins Airport covers an area of 60 acres (24 ha) at an elevation of 53 feet (16 m) above mean sea level. It has two runways with turf surfaces: 18/36 is 2,842 by 70 feet (866 x 21 m) and 12/30 is 2,035 by 70 feet (620 x 21 m). For the 12-month period ending December 1, 2011, the airport had 1,400 general aviation aircraft operations, an average of 116 per month. At that time there were 20 aircraft based at this airport: 90% single-engine, 5% multi-engine, and 5% glider. See also * List of airports in Delaware References External links * at Delaware DOT website Aerial image as of March 1992from USGS ''The National Map ''The National Map'' is a collaborative effort of the United States Geological Survey (USGS) and othe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
