Degradation

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degradation

[‚deg·rə′dā·shən]
(computer science)
Condition under which a computer operates when some area of memory or some units of peripheral equipment are not available to the user.
(geology)
The wearing down of the land surface by processes of erosion and weathering.
(hydrology)
Lowering of a stream bed.
Shrinkage or disappearance of permafrost.
(organic chemistry)
Conversion of an organic compound to one containing a smaller number of carbon atoms.
(physics)
Loss of energy of a particle, such as a neutron or photon, through a collision.
(thermodynamics)
The conversion of energy into forms that are increasingly difficult to convert into work, resulting from the general tendency of entropy to increase.

Degradation

A loss of the original characteristics, or weakening of an element by erosion; a disintegration of paint by heat, moisture, sunlight or natural weathering. Also harmful action caused by human activity, such as vandalism.

Degradation

 

in biology, the simplification in structure and function of animals or plants under the influence of conditions of existence that have altered. Distinction is made between ontogenetic degradation—that is, simplification of the organism in the final stages of its development as compared with the initial stages—and phylogenetic degradation, or simplification of the structure of descendants as compared with the organization of their ancestors.

degradation

Disintegration of a paint film by heat, moisture, sunlight, or natural causes.
References in periodicals archive ?
The primary focus on metallic nanoparticles in degradation studies is based on zero-valent iron (nZVI), because of several desirable attributes such as high activity, low cost, easy obtainment of the starting material, and low toxicity [25-27].
For a single-unit system which degrades during the operation, the degradations can be detected by sensors at equally spaced discrete time epochs k, k=0, 1, 2...NT, with [DELTA]t being the constant time interval between two consecutive observations.
Furthermore, most of these dyes are biorefractory and do not undergo effective degradation using conventional biological techniques [3].
Keywords Attenuated total reflectance-Fourier transform infrared spectroscopy, Laser scanning confocal microscopy, Photoreactivity, Polymeric coating, Titanium dioxide, Ultraviolet degradation
To maintain optimum service levels, IT organizations need solutions that provide an end-to-end business view of all critical applications which will quickly isolate the root cause of performance degradations and initiate expert domain-centric tools for fast problem diagnosis and resolution."
There are also chemical degradations caused by the attack of microorganisms.
In recent years our group has been interested in the research of new aromatic thermoplastic polyethers containing carbonyl and sulfone linkages [6, 7], and a comparative kinetic study of the thermal and oxidative degradations suggested that the cleavage of [SO.sub.2] group is the controlling process of the first degradation stage of polymers containing a sulfone group in their repeating unit [8-11].
t curves appear at relatively late times, which confirms that the thermal oxidative degradations are autocatalityc in nature (11) [ILLUSTRATION FOR FIGURE 3 OMITTED]).
Land and soil degradation assessments have recently become more fashionable responding to environmental concerns in countries that have claimed its significant adverse impact on agronomic productivity, the environment, and its effect on food security and the quality of life.
There existed an induction period before degradation or chain scission.
Among different semiconducting materials, titanium dioxide, a widely used photocatalyst for oxidizing degradation of organics in the wastewater [2-5], is always preferred for its strong oxidizing ability, bulk nontoxicity, ready availability, and long-term stability [6-8].