|
Search over 100 encyclopedias and dictionaries: |
Research categories | Follow us on Twitter |
Research categories
View all topics in the newsView all reference sources at Encyclopedia.com |
|||
|
emission
... Read more |
|
emission spectrum
... Read more |
|
Aircraft exhaust emissions
... Read more |
|
|
thermionic emission
thermionic emission , emission of electrons or ions by substances that are highly heated, the charged particles being called thermions. The number of thermions emitted increases rapidly as the temperature of the substance rises. The heated material may be in the form of a metal filament or of... Read more |
|
Emissions trading
Emissions Trading Emissions trading brings the rules of the marketplace to environmental regulation. For example, a government trying to control acid rain might set a limit of ten metric tons on emissions of sulfur dioxide SO2 (which causes acid rain) in a particular year. If there are 1,000... Read more |
|
|
photoelectric effect
photoelectric effect emission of electrons by substances, especially metals, when light falls on their surfaces. The effect was discovered by H. R. Hertz in 1887. The failure of the classical theory of electromagnetic radiation to explain it helped lead to the development of the quantum theory .... Read more |
|
|
dyslexia
dyslexia , in psychology, a developmental disability in reading or spelling, generally becoming evident in early schooling. To a dyslexic, letters and words may appear reversed, e.g., d seen as b or was seen as saw. Many dyslexics never learn to read or write effectively, although they tend... Read more |
|
Reforestation
reforestation The replanting of trees on areas of land where forests have been cleared by felling or burning (see deforestation) or by natural means. Reforestation is particularly important in countries, such as Brazil, where large areas of forest have been destroyed by deforestation, although... Read more |
|
radioactivity
radioactivity Spontaneous change of the atomic nuclei of atoms, accompanied by the emission of radiation. The process by which a radioactive nucleus disintegrates is known as radioactive decay.... Read more |
|
Luciferase
Bioluminescence Bioluminescence is the emission of visible light by biological systems, which arises from enzyme-catalyzed chemical reactions. Bioluminescence can be distinguished from chemiluminescence in that it occurs in living organisms and requires an enzyme ... Read more |
|
|
Europe's Leading Premium Disposable Diaper Brand Bambo-Nature Certified Free...
...entitled "Acute Respiratory Effects of Diaper Emissions...documented respiratory toxicity...disposable diapers emit mixtures...toxic to the respiratory tract. Disposable ... |