Fr.: trou de Lockman
A region in the sky lying roughly between the → pointer stars of the → Big Dipper that is almost free from → neutral hydrogen gas in the → Galaxy. It is centered at R.A. 10h 45m, Dec. +57° 20', has an area of 15 square degrees, and a → column density of NH I ≤ 5 x 1018 cm-2. The Lockman hole is one of the favorite directions for obtaining a clear and unobstructed view of objects in deep space, far beyond our own Galaxy.
Named after Felix J. Lockman et al., 1986, ApJ 302, 432; → hole.
Fr.: lieu géométrique
The aggregate of all possible positions of a moving or generating element, e.g. the locus of points equidistant from a given point is a circle whose center is the given point.
From L. locus "place," from Old L. stlocus, literally "where something is placed," from PIE base *st(h)el- "to cause to stand, to place."
Mahalgân, from mahal "place, locality" + -gân relation and multiplicity suffix.
Named after Lodhran (Punjab), Pakistan, where the type specimen fell on 1 October 1868.
A low frequency radio telescope network concentrated in the Netherlands with extensions into other European countries. It consists of a core and an extended → array in the Netherlands as well as in surrounding European countries with maximum → baselines of 2 km, 100 km, and 1,000 km respectively. LOFAR will be the largest radio telescope ever built, using a new concept based on a vast array of simple omni-directional antennas. The array will operate at the lowest frequencies that can be observed from Earth, at 30-250 MHz. About 75% of the construction is finished and LOFAR has already started its → commissioning period. When entirely finished, it will consist of 45,000 small antennas, distributed within 48 stations in the north east of the Netherlands, nearby parts of Germany, the UK, France, Sweden, and perhaps later Poland and Spain. The extensions in the United Kingdom, Germany, and France are completed. The French extension, located in the Nançay station of Paris Observatory (190 km south of Paris), is fully operational since December 2010. Moreover, a project to extend the low-frequency component of the Nançay station is under study. LOFAR is a forerunner of the future → Square Kilometer Array (SKA) project. See also the LOFAR homepage.
1) log; 2) logidan
Fr.: 1) journal; 2) enregistrer
1) Any of various records, made in rough or finished form,
concerning a trip made by a ship or aircraft and dealing with
particulars of navigation, weather, engine performance, discipline,
and other pertinent details; → logbook.
M.E. logge, variant of lugge "pole, limb of tree; piece of wood," of unknown origin, back formation from logbook, a book used by sailors to record the speed measurements made by means of a chip of a tree log on the end of a reeled log line.
1) Log, loan from E., as above.
Fr.: s'identifier, se connecter
Computers: To enter identifying data, as a user name or password, into a database, mobile device, or computer, especially a multi-user computer or a remote or networked system, so as to to access and use it (Dictionary.com).
Fr.: se déconnecter
Computers: To terminate a session.
The → exponent of the → power to which it is necessary to raise a fixed number to produce the given number. The fixed number is called the → base. The logarithm of x to the base a, denoted loga(x), is the unique → real number y such that ay = x. In the familiar system of → common logarithms, the base is 10. In the system of → natural logarithms, the base is e = 2.7182818 ... (→ number e). For example, the logarithm of 100 (base 10) is 2 because 102 = 100.
Of or pertaining to a → logarithm.
Fr.: extinction logarithmique
Same as → reddening coefficient.
Fr.: échelle logarithmique
A scale of measurement in which an increase of one unit represents a tenfold increase in the quantity measured (for common logarithms)
Fr.: livre de bord, journal de navigation, carnet de vol, carnet d'observations
A book in which details of a trip made by a ship or aircraft are recorded; log (Dictionary.com).
guyik, cemguyik (#)
1) The science that investigates the principles governing correct or reliable
M.E. logik; O.Fr. logique, from L. (ars) logica, from Gk. logike (techne) "reasoning (art)," from feminine of logikos "pertaining to speaking or reasoning," from logos "reason, idea, word."
Guyik, from guy- present stem of goftan "to say, speak, relate,
tell; to compose a poem," from Mid.Pers. guftan "to say, tell, utter;"
O.Pers. gaub- "to say" + -ik, → -ic.
Fr.: diagramme logique
A diagram that uses special symbols called logic symbols to represent the detailed functioning of electronic logic circuits. The symbols do not represent the type of electronics used, but only their functions.
guyik, gyuiki, guyikvâr
1) According to or agreeing with the principles of logic.
Fr.: connecteur logique
A symbol that can be combined with one or more → sentences in order to form a new sentence. For example "and" (∧), "or" (∨) "not" (¬), "if-then" (→), and "iff" (⇔).
Fr.: logiquement équivalent
Fr.: identification, connexion
1) The act of logging in to a database, mobile device, or computer,
especially a multi-user computer or a remote or networked computer system.
Fr.: distribution logarithmico-normale
Fr.: fin de session, déconnexion
The process by which a computer user logs out.