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MDA (other)
MDA, mda or variants may refer to: Businesses and organizations Political parties * Meghalaya Democratic Alliance (2003–2008), in India * Meghalaya Democratic Alliance (2018–present), in India * Movement for Democracy in Africa, in Burkina Faso Businesses and other organizations * MDA (company), a Canadian space technology company * Magen David Adom, Israel's emergency medical, disaster, ambulance and blood bank service * Malaysia Design Archive, a non-profit private organization * Media Development Authority, in Singapore * Medical Devices Agency, now part of Medicines and Healthcare products Regulatory Agency, in the UK * Minnesota Department of Agriculture, in the U.S. * Missile Defense Agency, an agency of the U.S. Department of Defense * Muscular Dystrophy Association, an American organization * Museum Documentation Association, now Collections Trust, a British charity * Myanmar Dental Association, a professional association People * A. P. Mda (1916-1993) South Af ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meghalaya Democratic Alliance (2003–2008)
The Meghalaya Democratic Alliance (MDA) was a coalition of political parties that formed the Government in the state of Meghalaya, India, after the 2003 Legislative Assembly election. It was headed by the Indian National Congress (INC), which was the party with the largest number of seats in the 7th Meghalaya Legislative Assembly. Chief Minister D. D. Lapang and the other ministers in the Government were all members of the MDA. D. D. Lapang also served as the Chairperson of the MDA. History After the 2003 elections to Legislative Assembly, INC Member of the Legislative Assembly (MLA) D. D. Lapang was elected the leader of the Congress Legislative Party (CLP). The Nationalist Congress Party (NCP) first made a bid to form the Government, but they gave up when they were unable to provide the Governor M.M. Jacob with sufficient number of MLAs to prove majority in the Assembly. The INC then formed the MDA along with other parties and independents opposed to the NCP and the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microconnect Distributed Antenna
Microconnect distributed antennas (MDA) are small-cell local area (100 metre radius) transmitter-receivers usually fitted to lampposts and other street furniture in order to provide Wireless LAN, GSM and GPRS connectivity. They are therefore less obtrusive than the usual masts and antennas used for these purposes and meet with less public opposition. Service provided The service provided by microconnect distributed antennas cover a market in heavily populated urban area addressing mobile and radio connection. Also MDA is suited for bustling cities and historical areas where mobile connection and ability is impaired. Having many low power, small antennae preforms and covers an area equal to or better than a traditional Macrocellular site. The centrally located radio base station connects to the antennae by fibre optical cable. Each antenna point contains a 63–65 GHz wireless unit alongside a large memory store providing proxy and cache services. Also users will be able to obtain 6 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Whole-body Counting
In health physics, whole-body counting refers to the measurement of radioactivity ''within'' the human body. The technique is primarily applicable to radioactive material that emits gamma rays. Alpha particle decays can also be detected indirectly by their coincident gamma radiation. In certain circumstances, beta emitters can be measured, but with degraded sensitivity. The instrument used is normally referred to as a whole body counter. This must not be confused with a "whole body monitor" which used for personnel exit monitoring, which is the term used in radiation protection for checking for external contamination of a whole body of a person leaving a radioactive contamination controlled area. Principles If a gamma ray is emitted from a radioactive element within the human body due to radioactive decay, and its energy is sufficient to escape then it can be detected. This would be by means of either a scintillation detector or a semiconductor detector placed in close proximi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mesocyclone
A mesocyclone is a meso-gamma mesoscale (or storm scale) region of rotation (vortex), typically around in diameter, most often noticed on radar within thunderstorms. In the northern hemisphere it is usually located in the right rear flank (back edge with respect to direction of movement) of a supercell, or often on the eastern, or leading, flank of a high-precipitation variety of supercell. The area overlaid by a mesocyclone’s circulation may be several miles (km) wide, but substantially larger than any tornado that may develop within it, and it is within mesocyclones that intense tornadoes form. Description Mesocyclones are medium-scale vortices of rising and converging air that circulate around a vertical axis. They are most often associated with a local region of low-pressure. Their rotation is (usually) in the same direction as low pressure systems in a given hemisphere: counter-clockwise in the northern, and clockwise in the southern hemisphere, with the only occasio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mean Directional Accuracy
Mean directional accuracy (MDA), also known as mean direction accuracy, is a measure of prediction accuracy of a forecasting method in statistics. It compares the forecast direction (upward or downward) to the actual realized direction. It is defined by the following formula: : \frac\sum_t \mathbf_ where ''A''''t'' is the actual value at time ''t'' and ''F''''t'' is the forecast value at time ''t''. Variable ''N'' represents number of forecasting points. The function \sgn(\cdot) is sign function and \mathbf is the indicator function. In simple words, MDA provides the probability that the under study forecasting method can detect the correct direction of the time series. MDA is a popular metric for forecasting performance in economics and finance. MDA is used in economics applications where the economist is often interested only in directional movement of variable of interest. As an example in macroeconomics, a monetary authority who wants to know the direction of the inflatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mass Drug Administration
The administration of drugs to whole populations irrespective of disease status is referred to as mass drug administration (MDA). This article describes the administration of antimalarial drugs to whole populations an intervention which has been used as a malaria-control measure for more than 70 years. Recent proposals to eliminate or even to eradicate malaria have led to a renewed interest in mass drug administrations in areas with very high malaria endemicity. Drugs have been administered either directly as a full therapeutic course of treatment or indirectly through the fortification of salt. Mass drug administrations were generally unsuccessful in interrupting transmission but, in some cases, had a marked effect on parasite prevalence and on the incidence of clinical malaria. MDAs are likely to encourage the spread of drug-resistant parasites and so have only a limited role in malaria control. They may have a part to play in the management of epidemics and in the control of mala ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 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 ''m''u, is defined identically, giving . 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 . This is an intrinsic property of the isotope and all helium-4 atoms have the same mass. Acetylsalicylic acid (aspirin), , has an average mass of approximately . However, there are no acetylsalicylic acid molecules with this mass. The two most common masses of individual acetylsalicylic acid molecules are , having the most common isotopes, and , in which one carbon is carbon-13. The molecular mass ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metal Deactivator
Metal deactivators, or metal deactivating agents (MDA) are fuel additives and oil additives used to stabilize fluids by deactivating (usually by sequestrant, sequestering) metal ions, mostly introduced by the action of naturally occurring acids in the fuel and acids generated in lubricants by oxidative processes with the metallic parts of the systems. Fuels desulfurized by copper sweetening also contain a significant trace amounts of copper. Metal deactivators inhibit the catalytic effects of such ions, especially copper, retarding the formation of gummy residues (e.g. gels containing copper mercaptide). Even concentrations of copper as low as 0.1 ppm can have detrimental effects. An example of a metal deactivator used for gasoline and jet fuels is salpn. It is used in turbine and jet fuels, Diesel fuel, diesel, heating oil, and grease (lubricant), greases. It is approved for military and commercial aviation fuels. Benzotriazole and its various derivatives are also common in lubric ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phases Of Ice
Ice is water frozen into a solid state, typically forming at or below temperatures of 0 degrees Celsius or Depending on the presence of impurities such as particles of soil or bubbles of air, it can appear transparent or a more or less opaque bluish-white color. In the Solar System, ice is abundant and occurs naturally from as close to the Sun as Mercury to as far away as the Oort cloud objects. Beyond the Solar System, it occurs as interstellar ice. It is abundant on Earth's surfaceparticularly in the polar regions and above the snow lineand, as a common form of precipitation and deposition, plays a key role in Earth's water cycle and climate. It falls as snowflakes and hail or occurs as frost, icicles or ice spikes and aggregates from snow as glaciers and ice sheets. Ice exhibits at least eighteen phases ( packing geometries), depending on temperature and pressure. When water is cooled rapidly (quenching), up to three types of amorphous ice can form depending on its hist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Malondialdehyde
Malondialdehyde (MDA) is the organic compound with the nominal formula CH2(CHO)2. A colorless liquid, malondialdehyde is a highly reactive compound that occurs as the enol. It occurs naturally and is a marker for oxidative stress. Structure and synthesis Malondialdehyde mainly exists as the enol:V. Nair, C. L. O'Neil, P. G. Wang "Malondialdehyde", ''Encyclopedia of Reagents for Organic Synthesis'', 2008, John Wiley & Sons, New York. Article Online Posting Date: March 14, 2008 :CH2(CHO)2 → HOC(H)=CH-CHO In organic solvents, the ''cis''-isomer is favored, whereas in water the ''trans''-isomer predominates. The equilibrium is rapid and is inconsequential for many purposes. In the laboratory it can be generated in situ by hydrolysis of its acetal 1,1,3,3-tetramethoxypropane, which is commercially available and shelf-stable, unlike malondialdehyde. Malondialdehyde is easily deprotonated to give the sodium salt of the enolate (m.p. 245 °C). Biosynthesis and reactivity ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
4,4'-Methylenedianiline
4,4′-Methylenedianiline (MDA) is an organic compound with the formula CH2(C6H4NH2)2. It is a colorless solid, although commercial samples can appear yellow or brown. It is produced on an industrial scale, mainly as a precursor to polyurethanes. Synthesis and applications In the industrial production, MDA is produced by reaction of formaldehyde and aniline in the presence of hydrochloric acid. MDA is consumed mainly as a precursor to Methylene diphenyl diisocyanate (MDI). MDA is treated with phosgene to produce MDI. MDI is a precursor to many polyurethane foams. Lower quantities are used as hardeners in epoxy resins and adhesives, as well as in the production of high-performance polymers. Additionally, hydrogenation of MDA can be performed to produce 4,4,diaminodicyclohexylmethane, which is also used in polymer chemistry. Safety MDA is considered a potential occupational carcinogen by the US National Institute for Occupational Safety and Health. The Occupational Safety a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
3,4-Methylenedioxyamphetamine
3,4-Methylenedioxyamphetamine (also known as MDA and sass) is an empathogen-entactogen, psychostimulant, and psychedelic drug of the amphetamine family that is encountered mainly as a recreational drug. In terms of pharmacology, MDA acts most importantly as a serotonin–norepinephrine–dopamine releasing agent (SNDRA). In most countries, the drug is a controlled substance and its possession and sale are illegal. MDA is rarely sought after as a recreational drug compared to other drugs in the amphetamine family; however, it remains an important and widely used drug due to it being a primary metabolite, the product of hepatic N-dealkylation, of MDMA (ecstasy). In addition, it is common to find MDA as an adulterant of illicitly produced MDMA. Uses Medical MDA currently has no accepted medical use. Recreational MDA is bought, sold, and used as a recreational 'love drug', due to its enhancement of mood and empathy. A recreational dose of MDA is sometimes cited as being b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
