Background radiation — This article is about ionizing radiation. For microwave background radiation from space, see Cosmic background radiation and cosmic background. Thermal radiation emitted by Earth is not considered in this category because it is not ionizing.… … Wikipedia
Level staff — A level staff, also called levelling rod, is a graduated wooden or aluminum rod, the use of which permits the determination of differences in elevation.Rod construction and materialsLevelling rods can be one piece, but many are sectional and can… … Wikipedia
level — 1. Any rank, position, or status in a graded scale of values. 2. A test for determining such rank or position. acoustic reference l. the biological reference l. for sound measurements. When the term decibel is used to … Medical dictionary
background noise — The level of intensity of signals due to normal activities other than the specific signal emission [16] … Lexicon of Cave and Karst Terminology
Symphony Orchestra of the National Taiwan Normal University Department of Music — Infobox musical artist Name = Symphony Orchestra of the National Taiwan Normal University Department of Music Background = classical ensemble Origin = Taipei, Taiwan, ROC Genre = Classical Occupation = Symphony orchestra Years active = 1975… … Wikipedia
baseline — base·line bā .slīn n a set of critical observations or data used for comparison or a control * * * base·line (bāsґlīn) an observation or value that represents the normal background level, or an initial level, of a measurable quantity;… … Medical dictionary
motion-picture technology — Introduction the means for the production and showing of motion pictures. It includes not only the motion picture camera and projector but also such technologies as those involved in recording sound, in editing both picture and sound, in… … Universalium
Ionizing radiation — consists of highly energetic particles or waves that can detach (ionize) at least one electron from an atom or molecule. Ionizing ability depends on the energy of the impinging individual particles or waves, and not on their number. A large flood … Wikipedia
Sound masking — For other uses of masking , see Masking (disambiguation). Sound masking is the addition of natural or artificial sound (such as as white noise or pink noise) into an environment to cover up unwanted sound by using auditory masking. This is in… … Wikipedia
human disease — Introduction an impairment of the normal state of a human being that interrupts or modifies its vital functions. health versus disease Before human disease can be discussed, the meanings of the terms health, physical fitness, illness … Universalium
Relief — For other uses, see Relief (disambiguation). A Persian mid relief (mezzo rilievo) from the Qajar era, located at Tangeh Savashi in Iran, which might also be described as two stages of low relief. Relief is a sculptural technique. The term relief… … Wikipedia