MDA - translation to Αγγλικά
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MDA - translation to Αγγλικά

UNIT OF MASS DEFINED AS ¹⁄₁₂ OF THE MASS OF A CARBON-12 ATOM
KDa; Kilodalton; Atomic Unit; Atomic mass units; Megadalton; Atomic mass unit (amu); Atomic mass constant; KiloDalton; Unified Atomic Mass Unit; Unified mass unit; Kilodaltons; KiloDaltons; Dalton unit; MDa; Kdal; Kilo Daltons; Uamu; Unified atomic mass unit; Atomic mass unit
  • Jean Perrin in 1926
  • Josef Loschmidt

MDA         

общая лексика

(Monochrome Display Adapter) адаптер монохромного дисплея, адаптер MDA

видеографический стандарт, введённый корпорацией IBM в 1981 г. в первых IBM PC. Позволял выводить на экран символы, каждый из которых размещался в матрице 9 на 14 точек, т.е. работал только в текстовом режиме. Был вытеснен HGA и CGA

(Mirrored Disk Array) RAID матрица (уровня 1) с дублированием данных на "зеркальном" дисковом накопителе

(Modulation-Domain Analysis) анализ [сигналов] в области модуляции

представление изменений частоты, фазы или временных интервалов во времени

(Mechanical Design Automation) автоматизация проектирования механики (механических устройств)

приложения, помогающие автоматизировать конструирование изделий и их инженерную подготовку к производству, например в авиационной промышленности

Смотрите также

cumulative throughflow; fractional throughflow

forward engineering         
SOFTWARE DESIGN APPROACH FOR THE DEVELOPMENT OF SOFTWARE SYSTEMS
Model Driven Architecture; Model-Driven Architecture; Model-driven Architecture; Forward engineering; Model-driven generation

общая лексика

прямая разработка

традиционный процесс разработки системы от концепции до физической реализации

антоним

reverse engineering

atomic mass unit         
атомная единица массы

Ορισμός

MDA

Βικιπαίδεια

Dalton (unit)

The dalton or unified atomic mass unit (symbols: Da or u) is a non-SI unit of mass widely used in physics and chemistry. It is defined as 112 of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state and at rest. The atomic mass constant, denoted mu, is defined identically, giving mu = m(12C)/12 = 1 Da.

This unit is commonly used in physics and chemistry to express the mass of atomic-scale objects, such as atoms, molecules, and elementary particles, both for discrete instances and multiple types of ensemble averages. For example, an atom of helium-4 has a mass of 4.0026 Da. This is an intrinsic property of the isotope and all helium-4 atoms have the same mass. Acetylsalicylic acid (aspirin), C
9
H
8
O
4
, has an average mass of approximately 180.157 Da. However, there are no acetylsalicylic acid molecules with this mass. The two most common masses of individual acetylsalicylic acid molecules are 180.0423 Da, having the most common isotopes, and 181.0456 Da, in which one carbon is carbon-13.

The molecular masses of proteins, nucleic acids, and other large polymers are often expressed with the units kilodaltons (kDa), megadaltons (MDa), etc. Titin, one of the largest known proteins, has a molecular mass of between 3 and 3.7 megadaltons. The DNA of chromosome 1 in the human genome has about 249 million base pairs, each with an average mass of about 650 Da, or 156 GDa total.

The mole is a unit of amount of substance, widely used in chemistry and physics, which was originally defined so that the mass of one mole of a substance, measured in grams, would be numerically equal to the average mass of one of its constituent particles, measured in daltons. That is, the molar mass of a chemical compound was meant to be numerically equal to its average molecular mass. For example, the average mass of one molecule of water is about 18.0153 daltons, and one mole of water is about 18.0153 grams. A protein whose molecule has an average mass of 64 kDa would have a molar mass of 64 kg/mol. However, while this equality can be assumed for almost all practical purposes, it is now only approximate, because of the way mole was redefined on 20 May 2019.

In general, the mass in daltons of an atom is numerically close but not exactly equal to the number of nucleons contained in its nucleus. It follows that the molar mass of a compound (grams per mole) is numerically close to the average number of nucleons contained in each molecule. By definition, the mass of an atom of carbon-12 is 12 daltons, which corresponds with the number of nucleons that it has (6 protons and 6 neutrons). However, the mass of an atomic-scale object is affected by the binding energy of the nucleons in its atomic nuclei, as well as the mass and binding energy of its electrons. Therefore, this equality holds only for the carbon-12 atom in the stated conditions, and will vary for other substances. For example, the mass of one unbound atom of the common hydrogen isotope (hydrogen-1, protium) is 1.007825032241(94) Da, the mass of the proton is 1.007276466621(53) Da,, the mass of one free neutron is 1.00866491595(49) Da, and the mass of one hydrogen-2 (deuterium) atom is 2.014101778114(122) Da. In general, the difference (absolute mass excess) is less than 0.1%; exceptions include hydrogen-1 (about 0.8%), helium-3 (0.5%), lithium-6 (0.25%) and beryllium (0.14%).

The dalton differs from the unit of mass in the atomic units systems, which is the electron rest mass (me).

Παραδείγματα από το σώμα κειμένου για MDA
1. MDA had a special place in his heart, he said, because his late mother had been an ardent worker for MDA in Rhodesia.
2. "MDA volunteers sometimes e–mail us pictures from their homes.
3. Nevertheless, not only have senior MDA officials failed to stop this practice, despite repeated complaints to both MDA and the Health Ministry, but some have even explicitly approved it.
4. Where‘s MDA?‘" Dozens of horrified kibbutz residents gathered during the rescue efforts.
5. "I‘ve been working for MDA for six years; I‘ve dealt with innumerable accidents.
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