enow.com Web Search

Search results

1. Results from the WOW.Com Content Network

2. Parts-per notation - Wikipedia

   en.wikipedia.org/wiki/Parts-per_notation

   In science and engineering, the parts-per notation is a set of pseudo-units to describe small values of miscellaneous dimensionless quantities, e.g. mole fraction or mass fraction. Since these fractions are quantity-per-quantity measures, they are pure numbers with no associated units of measurement. Commonly used are parts-per-million (ppm, 10 ...

3. Pulse-position modulation - Wikipedia

   en.wikipedia.org/wiki/Pulse-position_modulation

   v. t. e. Pulse-position modulation (PPM) is a form of signal modulation in which M message bits are encoded by transmitting a single pulse in one of possible required time shifts. [1][2] This is repeated every T seconds, such that the transmitted bit rate is bits per second. It is primarily useful for optical communications systems, which tend ...

4. Netpbm - Wikipedia

   en.wikipedia.org/wiki/Netpbm

   The Netpbm package can, for example, use two successive conversion programs to turn a color picture in the GIF format into a .bmp file: giftopnm somepic.gif > somepic.ppm ppmtobmp somepic.ppm > somepic.bmp This is more commonly done as a pipeline, to save execution time and to avoid leaving a temporary somepic.ppm file around:

5. Grain per gallon - Wikipedia

   en.wikipedia.org/wiki/Grain_per_gallon

   The grain per gallon (gpg) is a unit of water hardness defined as 1 grain (64.8 milligrams) of calcium carbonate dissolved in 1 US gallon of water (3.785412 L). It translates into 1 part in about 58,000 parts of water or 17.1 parts per million (ppm). Also called Clark degree (in terms of an imperial gallon).

6. Useful conversions and formulas for air dispersion modeling

   en.wikipedia.org/wiki/Useful_conversions_and...

   Wind speed conversion factors. Meteorological data includes wind speeds which may be expressed as statute miles per hour, knots, or meters per second. Here are the conversion factors for those various expressions of wind speed: 1 m/s = 2.237 statute mile/h = 1.944 knots. 1 knot = 1.151 statute mile/h = 0.514 m/s.

7. Carbon dioxide in Earth's atmosphere - Wikipedia

   en.wikipedia.org/wiki/Carbon_dioxide_in_Earth's...

   The concentrations of carbon dioxide in the atmosphere are expressed as parts per million by volume (abbreviated as ppmv, or ppm(v), or just ppm). To convert from the usual ppmv units to ppm mass (abbreviated as ppmm, or ppm(m)), multiply by the ratio of the molar mass of CO 2 to that of air, i.e. times 1.52 (44.01 divided by 28.96).