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CENTER DISPLACEMENT [10 records]

Record 1 2021-04-21

English

Subject field(s)
  • Ignition Systems (Motor Vehicles)
  • Motorcycles and Snowmobiles
CONT

On some large displacement twins or singles, "kickback" can occur if the fuel ignites before the piston reaches top dead center. This causes the crank to spin backwards and can be painful for the rider as the lever kicks back on their foot.

Key term(s)
  • kick-back

French

Domaine(s)
  • Allumage (Véhicules automobiles)
  • Motos et motoneiges
CONT

En dehors d'un aspect peu pratique, le kick a aussi le défaut, lorsque la compression ne passe pas ou que le moteur cale immédiatement après avoir démarré, d'exposer [le motocycliste] au «retour de kick», où le kick risque de heurter violemment [son] mollet, à la suite d'une rotation inverse du moteur [...]

Spanish

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Record 2 2016-01-13

English

Subject field(s)
  • Electromagnetic Radiation
  • Geophysics
CONT

... over the South Atlantic Ocean, off the coast of Brazil, the shielding effect of the magnetosphere is not quite spherical but shows a "pothole, "a dip, which scientists explain as a result of the eccentric displacement of the center of the magnetic field from the geographical center of the Earth... as well as the displacement between the magnetic and geographic poles of Earth. For orbits tilted... and having altitudes of a few hundred miles, this oddity, called the South Atlantic Anomaly(SAA) becomes important, because spacecraft in those orbits periodically pass through that zone of reduced natural shielding and thus spend a few minutes during each passage exposed to higher particle flux than outside it.

French

Domaine(s)
  • Rayonnements électromagnétiques
  • Géophysique
CONT

SWARM livrera d'importantes données qui jetteront un éclairage nouveau sur l'expansion de l'anomalie de l'Atlantique Sud, lourde de conséquences pour le fonctionnement des satellites sur orbite terrestre basse. Géographiquement, l'affaiblissement récent du dipôle magnétique terrestre s'explique dans une large mesure par les modifications du champ magnétique observées dans cette région.

Spanish

Campo(s) temático(s)
  • Radiación electromagnética
  • Geofísica
CONT

La anomalía del Atlántico Sur (AAS), se refiere a una región en el sur del océano Atlántico donde los cinturones de radiación Van Allen [se] encuentran a menos de 500 kilómetros de la Tierra, estos cinturones normalmente se encuentran ubicados entre los 1.000 y los 5.000 kilómetros, culpa de una depresión en la intensidad del campo magnético terrestre, se estima que en esta zona el mismo tiene valores inferiores a la mitad del promedio del planeta lo que implica una zona más vulnerable a las radiaciones cósmicas nocivas. Se cree que esto se debe al hecho de que el centro del campo magnético de la Tierra está desviado de su centro geográfico.

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Record 3 2007-01-13

English

Subject field(s)
  • Acoustics (Physics)
  • Audio Technology
CONT

Acoustic compliance, associated with a volume of air that is compressed by a net force without an appreciable average displacement of the center of gravity of the air in the volume, acts as a capacitance. Both acoustic mass and acoustic compliance are reactive portions of acoustic impedance...

French

Domaine(s)
  • Acoustique (Physique)
  • Électroacoustique
DEF

Force nécessaire pour faire bouger un objet d'une certaine distance, objet suspendu, par exemple l'élasticité d'un ressort.

OBS

Les ressorts de la membrane dans un haut-parleur ont une élasticité mécanique. L'air au sein de la chambre de compression possède une élasticité acoustique.

OBS

Inverse de la raideur acoustique.

Spanish

Campo(s) temático(s)
  • Acústica (Física)
  • Electroacústica
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Record 4 2004-04-04

English

Subject field(s)
  • Optics
  • Photography
DEF

An image defect, usually caused by errors of centration, that results in the displacement of image points perpendicular to a radius from the center of the field.

French

Domaine(s)
  • Optique
  • Photographie
CONT

La distorsion tangentielle est causée par un mauvais ajustement des lentilles par rapport à l'axe optique et s'ajoute à la distorsion radiale.

Spanish

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Record 5 2004-03-26

English

Subject field(s)
  • Aerospace Medicine
OBS

Several different terminologies have been used to describe physiological acceleration. Since the terminology may be based either on the action of the accelerating vehicle or the reaction of the passenger, the terms used are often confusing to a reader without prior knowledge of the system of terminology used. Probably the most easily understood system is the eyeballs in, eyeballs out, eyeballs down, eyeballs up, etc., terminology used by test pilots, which refers to the sensations experienced by the person being accelerated. Thus, the acceleration experienced in an aircraft pullout or inside loop is eyeballs down. Note that, in the NASA vehicle(center of gravity displacement) terminology, this is-az acceleration. Some physiological-acceleration terminologies designate accelerations in terms of the equivalent displacement acceleration of the subject as if he were starting from rest. In such terminologies a man standing up or sitting down on the surface of the earth is experiencing 1 g of headward acceleration because of gravity. Other descriptive terms used in this way are footward, forward(the acceleration experienced by a man pressed into the seat back by an accelerating vehicle), rearward, leftward, rightward, spineward, sternumward, and tailward. One terminology based on reaction uses the terms head-to-foot(the acceleration generated by a pullout in an aircraft), chest-to-back, foot-to-head, and back-to-chest.

French

Domaine(s)
  • Médecine aérospatiale

Spanish

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Record 6 2003-08-01

English

Subject field(s)
  • Aerospace Medicine
DEF

Acceleration of the body in the direction from back to the chest.

OBS

Several different terminologies have been used to describe physiological acceleration. Since the terminology may be based either on the action of the accelerating vehicle or the reaction of the passenger, the terms used are often confusing to a reader without prior knowledge of the system of terminology used. Probably the most easily understood system is the eyeballs in, eyeballs out, eyeballs down, eyeballs up, etc., terminology used by test pilots, which refers to the sensations experienced by the person being accelerated. Thus, the acceleration experienced in an aircraft pullout or inside loop is eyeballs down. Note that, in the NASA vehicle(center of gravity displacement) terminology, this is-az acceleration. Some physiological-acceleration terminologies designate accelerations in terms of the equivalent displacement acceleration of the subject as if he were starting from rest. In such terminologies a man standing up or sitting down on the surface of the earth is experiencing 1 g of headward acceleration because of gravity. Other descriptive terms used in this way are footward, forward(the acceleration experienced by a man pressed into the seat back by an accelerating vehicle), rearward, leftward, rightward, spineward, sternumward, and tailward. One terminology based on reaction uses the terms head-to-foot(the acceleration generated by a pullout in an aircraft), chest-to-back, foot-to-head, and back-to-chest.

French

Domaine(s)
  • Médecine aérospatiale

Spanish

Save record 6

Record 7 2001-06-21

English

Subject field(s)
  • General Mechanics (Physics)
  • Aircraft Piloting and Navigation
DEF

Velocity changes of an object moving along a straight line or vector through the center of gravity.

CONT

Gyroscope drift rate effects are usually classified into three groups. The first group is independent of applied acceleration... The second group includes effects proportional to translational acceleration. This group covers such things as static unbalance of the inner gimbal assembly, i. e., the displacement between the center of support or buoyancy and the center of mass.

French

Domaine(s)
  • Mécanique générale (Physique)
  • Pilotage et navigation aérienne
CONT

Selon [...] [le Principe d'Équivalence (PE) (postulat de Albert Einstein]), un effet d'accélération (inertie) et un effet gravitationnel (attraction entre deux masses gravitationnelles) sont équivalents. [...] les «sphères de Galilée» restent toujours l'idée maîtresse pour tester le PE. Notre idée est de tirer parti de la situation zéro-g pour comparer l'accélération angulaire de deux masses, plutôt qu'une accélération de translation, ce qui nous donnerait l'opportunité de faire «exploser» théoriquement la précision des résultats.

Spanish

Save record 7

Record 8 1998-12-09

English

Subject field(s)
  • Water Transport
  • Fluid Mechanics and Hydraulics (Physics)
  • Oil Drilling
DEF

The geometric center of gravity, or center of area of the water plane at which a vessel floats. A vessel pitches, or rotates (about a transverse horizontal axis) through this point, when actuated by an external force.

DEF

The geometric center of the water plane at which a mobile, offshore drilling rig floats and about which point a rig rotates when acted upon by an external force without a change in displacement.

Key term(s)
  • centre of floatation
  • floatation centre
  • floatation center
  • centre of flotation
  • flotation centre
  • flotation center

French

Domaine(s)
  • Transport par eau
  • Mécanique des fluides et hydraulique (Physique)
  • Forage des puits de pétrole
DEF

Centre de la surface de flottaison.

Spanish

Save record 8

Record 9 1985-01-15

English

Subject field(s)
  • Computer Programs and Programming
DEF

A surface defined in terms of some other surface by a displacement of each point dependent on the local shape. Examples are constant offset, where each point is moved a constant distance along the local surface normal, and cutter offset, which gives the tool center surface.

French

Domaine(s)
  • Programmes et programmation (Informatique)

Spanish

Save record 9

Record 10 1984-05-25

English

Subject field(s)
  • Optical Telecommunications
DEF

an optical fiber of circular cross section whose refractive index and other material parameters are independent of the angular displacement of the central angle and the longitudinal coordinate, although the parameters are a function of the distance from the center. i. e., the transmission media parameters are the same in all radial directions at any cross section.

Key term(s)
  • circularly symmetric fibre

French

Domaine(s)
  • Télécommunications optiques

Spanish

Save record 10

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