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Filter

Filter

1. A porous substance through which a liquid or gas is passed in order to separate it from contained particulate matter or impurities.

Synonym: filtrum.

2. To use or to subject to the action of a filter.

3. In diagnostic or therapeutic radiology, a plate made of one or more metals such as aluminum and copper that, placed in the x-or gamma-ray beam, permits passage of a greater proportion of higher energy radiation and attenuation of lower and less desirable energy radiation, raising the average energy or hardening the beam.

4. A device used in spectrophotometric analysis to isolate a segment of the spectrum.

5. A mathematical algorithm applied to image data for the purpose of enhancing image quality, usually by suppression of high spatial frequency noise.

Origin: Mediev. L. Filtro, pp. -atus, to strain through felt, fr. Filtrum, felt remove by passing through a filter; filter out the impurities.


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Re:

what about http://www.pubmed.com than? I wasn't finding anything with the Free Full Article filter on, which is unfortunate since the full articles usually give an overview of the latest research. But I'm not familiar with the anatomical terminology.

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by wildfunguy
Sat Aug 02, 2014 10:09 pm
 
Forum: Human Biology
Topic: Female ejaculation
Replies: 11
Views: 24791

How Does Natural Selection Create Ordered Variation?

1) why should dynamic filter result in uniform result? That just doesn't make sense, if you once select for for wings, you'll get short wings, if you select for long wings, you'll select long wings. Here's why Because the changes in ...

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by Doom
Tue Jan 21, 2014 11:35 pm
 
Forum: Evolution
Topic: How Does Natural Selection Create Ordered Variation?
Replies: 7
Views: 3258

How Does Natural Selection Create Ordered Variation?

1) why should dynamic filter result in uniform result? That just doesn't make sense, if you once select for for wings, you'll get short wings, if you select for long wings, you'll select long wings. 2) why do you think that the environment ...

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by JackBean
Tue Jan 21, 2014 5:03 pm
 
Forum: Evolution
Topic: How Does Natural Selection Create Ordered Variation?
Replies: 7
Views: 3258

Re: How Does Natural Selection Create Ordered Variation?

Try this: A dynamic filter applied to a DINAMIC random input. So it'd be sort of like intersecting waves. They are just as likely to negate as to add up. The law of averages dictates that natural selection can't make any progress then, ...

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by Cat
Sat Jan 18, 2014 4:59 pm
 
Forum: Evolution
Topic: How Does Natural Selection Create Ordered Variation?
Replies: 7
Views: 3258

How Does Natural Selection Create Ordered Variation?

... actuality, natural selection can only let through a certain amount of mutation. Creationists have it backward. So basically natural selection is a filter. It filters the random mutations, selecting only the best for the particular environment. Simple right? Now here's my problem: A. A static filter ...

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by Doom
Wed Jan 15, 2014 6:18 am
 
Forum: Evolution
Topic: How Does Natural Selection Create Ordered Variation?
Replies: 7
Views: 3258
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