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Emission nebulae emit spectral line radiation from ionized gas ( mostly ionized hydrogen ); they are often called HII regions ( the term " HII " is used in professional astronomy to refer to ionized hydrogen ).
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Emission and nebulae
Emission nebulae often have dark areas in them which result from clouds of dust which block the light.
Category: Emission nebulae
*** Emission nebulae
Category: Emission nebulae
Category: Emission nebulae
Category: Emission nebulae
Category: Emission nebulae
Category: Emission nebulae
Category: Emission nebulae
Category: Emission nebulae
* Fast Low-Ionization Emission Region ( FLIER ), a poorly-understood structure in some planetary nebulae
Emission and emit
* SULEV ( Super Ultra Low Emission Vehicle ): These vehicles emit substantially lower levels of hydrocarbons, carbon monoxide, oxides of nitrogen and particulate matter than conventional vehicles.
The global carbon market is dominated by the European Union, where companies that emit greenhouse gases are required to cut their emissions or buy pollution allowances or carbon credits from the market, under the European Union Emission Trading Scheme ( EU ETS ).
Emission and spectral
* Emission line, or " spectral line ", a dark or bright line in an otherwise uniform and continuous spectrum
* Sounding of the Atmosphere using Broadband Emission Radiometry ( SABER ): Multichannel radiometer designed to measure heat emitted by the atmosphere over a broad altitude and spectral range, as well as global temperature profiles and sources of atmospheric cooling.
Emission and line
Emission spectrum for sodium, showing the Fraunhofer lines | D line.
OTELO ( OSIRIS Tunable Emission Line Object survey ) is an emission line object survey using OSIRIS tunable filters in selected atmospheric windows relatively free of sky emission lines.
Emission and radiation
* Emission of greenhouse gases, a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range
* Emission ( electromagnetic radiation ), the process by which the energy of a photon is released by another entity
To separate and analyze them, the fluorescent radiation is passed through an Emission monochromator, and observed selectively by a detector.
Emission can also be induced by other sources of energy such as flames or sparks or electromagnetic radiation in the case of fluorescence.
* Popp, F. A., Ruth, B., Bahr, W., Böhm, J., Grass, P., Grolig, G., Rattemeyer, M., Schmidt, H. G., and Wulle, P .: Emission of visible and ultraviolet radiation by active biological systems.
* Photoelectric effect — Emission of electrons from a surface ( usually metallic ) upon exposure to, and absorption of, electromagnetic radiation ( such as visible light and ultraviolet radiation ).
Emission of radiation, 4.
Emission is the opposite of absorption, it is when an object emits radiation.
Emission of radiation is typically described using semi-classical quantum mechanics: the particle's energy levels and spacings are determined from quantum mechanics, and light is treated as an oscillating electric field that can drive a transition if it is in resonance with the system's natural frequency.
Interaction with electromagnetic radiation is used in fluorescence spectroscopy, protons or other heavier particles in Particle-Induced X-ray Emission and electrons or X-ray photons in Energy-dispersive X-ray spectroscopy or X-ray fluorescence.
Emission is a process by which a substance releases energy in the form of electromagnetic radiation.
* Emission ( electromagnetic radiation )
* Center for the Advancement of Natural Discoveries using Light Emission ( CANDLE ), Synchrotron radiation facility project in Armenia
* ICP-AES ( Inductively Coupled Plasma-Atomic Emission Spectrometry ), a machine to measure electromagnetic radiation emitted by atoms at a wavelength characteristic of a particular element
Emission and from
* Emission ( radiocommunications ), the radio signal ( usually modulated ) emitted from a radio transmitter
As deforestation contributes to global warming, Greenpeace has demanded that REDD ( Reduced Emission from Deforestation and Forest Degradation ) should be included in the climate treaty following the Kyoto treaty.
Historically, the word " maser " is derived from the original upper-case acronym MASER, which stands for " Microwave Amplification by Stimulated Emission of Radiation ".
Emission of soot from a large diesel engine | diesel truck, without particle filters.
* Emission security ( EMSEC ): Protection resulting from all measures taken to deny unauthorized persons information of value which might be derived from intercept and analysis of compromising emanations from crypto-equipment, automated information systems ( computers ), and telecommunications systems.
The European Pollutant Emission Register ( EPER ) showed that in 2004, estimated dioxin emissions from the ILVA plant were responsible for 83 % of Italy's total reported emissions.
* Imaging of Ultraweak Spontaneous Photon Emission from Human Body Displaying Diurnal Rhythm
A much higher quality DEM from the Advanced Spaceborne Thermal Emission and Reflection Radiometer ( ASTER ) instrument of the Terra satellite is also freely available for 99 % of the globe, and represents elevation at a 30 meter resolution.
Emission of isoprene is also observed in some bacteria and this is thought to come from non-enzymatic degradations from DMADP.
Examples include laser ( 1960 ) from Light Amplification by Stimulated Emission of Radiation, robotics ( 1941 ), agitprop ( 1930 ), searchency ( 2010 ).
* laser ( 1960 ) from Light Amplification by Stimulated Emission of Radiation
Emission from the Sun at centimetric ( radio ) wavelength is due primarily to coronal plasma trapped in the magnetic fields overlying active regions.
After Spirit stopped working scientists studied old data from the Miniature Thermal Emission Spectrometer, or Mini-TES and confirmed the presence of large amounts of carbonate-rich rocks, which means that regions of the planet may have once harbored water.
* Noise Equivalent Counts, a term from Positron Emission Tomography
Emission spectroscopy is a spectroscopic technique which examines the wavelengths of photons emitted by atoms or molecules during their transition from an excited state to a lower energy state.
Emission lines from hot gases were first discovered by Ångström, and the technique was further developed by David Alter, Gustav Kirchhoff and Robert Bunsen.
Emission from a bulk metal conduction band is a situation of the second type, and discussion here relates to this case.
In addition companies can purchase Certified Emission Reductions ( CERs ) which result from mitigated carbon emissions from UNFCCC approved projects for voluntary purposes.
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