منابع مشابه
Noise and Noise Meter Kay Hammer Noise and Noise Meter
In order to make use of analysis and low noise design techniques one requires a knowledge of the noise performance of circuit elements, circuits and complete systems in order to determine whether they meet the specifications or not. Also to judge the effort of noise decreasing procedures in circuits one need to be able to measure the noise level. If high precision noise measurement is required ...
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Sørensen used a slide-wire potentiometer to make his pH measurements. Here a known potential is applied to counterbalance the potential of the hydrogen cell (i.e. the hydrogen electrode plus the counter electrode) and to reduce its current output to zero, at which point the value of the applied counter-potential is equal to that of the cell potential. Since the point of balance is indicated by...
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The circadian system orchestrates the temporal organization of many aspects of physiology, including metabolism, in synchrony with the 24 hr rotation of the Earth. Like the metabolic system, the circadian system is a complex feedback network that involves interactions between the central nervous system and peripheral tissues. Emerging evidence suggests that circadian regulation is intimately li...
متن کاملA simple posture meter.
In ankylosing spondylitis a simple method of measuring and recording spinal deformity is of value in assessing progress. Methods in use include serial photography, serial strip plaster-of-paris casts, and lead-moulding tracing the outline on to paper. The apparatus described below is cheaper, less cumbersome, and more simple and convenient to use. Construction It consists of an upright, 6 ft. 3...
متن کاملMeter and speech
Speech is easily produced with regular periodic patterns—as if spoken to a metronome. If we ask what it is that is periodically spaced, the answer is a perceptual ‘beat’ that occurs near the onset of vowels (especially stressed ones). Surprisingly, when periodically produced speech is studied it exhibits attractors at harmonic fractions (especially halves and thirds) of the basic periodicity. I...
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ژورنال
عنوان ژورنال: The Journal of the Acoustical Society of America
سال: 1952
ISSN: 0001-4966
DOI: 10.1121/1.1917422