geographic coordinate system
râžmân-e hamârâhâ-ye zaminnegârik
Fr.: système de coordonnées géographiques
Fr.: latitude géographique
geographic north pole
qotb-e hudar-e zaminnegârik
Fr.: pôle nord géographique
→ north pole.
geographic south pole
qotb-e daštar-e zaminnegârik
Fr.: pôle sud géographique
→ south pole.
The science dealing with the areal differentiation of the Earth's surface, as shown in the character, arrangement, and interrelations over the world of such elements as climate, elevation, soil, vegetation, population, land use, industries, or states, and of the unit areas formed by the complex of these individual elements (Dictionary.com).
Fr.: diagramme, graphique, graphe
1) A visual representation of data that displays the relationship among variables,
usually cast along X and Y axes.
Short for graphic (formula), from L. graphicus "of painting or drawing," from Gk. graphikos "able to draw or paint," from graph(ein) "to draw, write" + -ikos, → ic.
Negâré, from negâr "picture, figure" (verb negârdan, negâštan "to paint"), from prefix ne-, O.Pers./Av. ni- "down; into," → ni-, + gâr, from kar-, kardan "to do, to make" (Mid.Pers. kardan; O.Pers./Av. kar- "to do, make, build;" Av. kərənaoiti "he makes;" cf. Skt. kr- "to do, to make," krnoti "he makes, he does," karoti "he makes, he does," karma "act, deed;" PIE base *kwer- "to do, to make").
Fr.: théorie des graphes
(Adj.) Pertaining to the use of diagrams, graphs, mathematical curves, or the like.
A particular crystalline form of → carbon occurring as a soft, black,
lustrous mineral. The carbon atoms in graphite are strongly bonded together in sheets.
Because the bonds between the sheets are weak, other atoms can easily fit between them,
causing graphite to be soft and slippery to the touch. Graphite conducts electricity
and is used in lead pencils and electrolytic anodes, as a lubricant, and as a
moderator in nuclear reactors. If graphite is subjected to high pressure, it
will be transformed into → diamond.
From Ger. Graphit, from Gk. graph(ein) "to write, draw," so called because it was used for pencils, → graph + -it a suffix of chemical compounds, equivalent to E. -ite.
1) An instrument for photographing the Sun, consisting of a camera and a
specially adapted telescope.
Of, relating to, or produced using → holography; three-dimensional.
Fr.: réseau holographique
A → diffraction grating produced from a series of constructive → interference fringes. The fringes, whose intensities vary in a sinusoidal pattern, correspond to the grooves of the grating. They are recorded on a photosensitive substrate and subsequently treated using a chemical procedure. Since the grooves are created by the interference of light, such a grating is free from the random and periodic errors present in → ruled gratings.
A technique for making three-dimensional images by recording → interference patterns from a split → laser beam on a medium such as photographic film. One of the → coherent beams irradiates the object, the second beam illuminates a recording medium. The two beams produce an interference pattern, called → hologram, on the film. The hologram contains information on both → phase and → amplitude of the object. However, this information is in a coded form, and the image must be reconstructed. When the object is removed and the hologram is illuminated by the laser from the original direction, a 3-dimensional image of the object appears where the object was originally, as if it were not removed. The visible object seems so real that the observer can detect → parallax by changing the position of one's head.
From → holo- "whole" + → -graphy. By using the term holography, Dennis Gabor (1900-1979), the Hungarian-British electrical engineer and inventor, wanted to stress that the technique records complete information about a wave, both about its amplitude and its phase, in contrast to the usual photography in which only the distribution of the amplitude is recorded.
The study, measurement, and description of depths and currents in open seas, lakes, estuaries, and rivers.
An instrument that records the hygrometer's measure of water vapor.
A branch of → linguistics that deals with the principle and methods of writing dictionaries.
The study of the ocean, embracing and integrating all knowledge pertaining to the ocean's physical boundaries, the chemistry and physics of sea water, and marine biology.
In astronautics, the study of satellite orbits and precise determination of orbital elements which gives the exact position of the satellite.
order of a graph
Fr.: ordre de graphe
aks, šidnegâr, nurnegâr
A picture produced by photography. → picture.