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FREE SURFACE EFFECT [7 records]

Record 1 2018-01-26

English

Subject field(s)
  • Gravity (Physics)
  • Shipbuilding
CONT

... the virtual centre of gravity is raised by free surface effect [that] further compounds the effects of loss of positive stability by lifting weights with a topped-up boom which raised the virtual centre of gravity even more, and reduced the vessel' s ability to right herself.

Key term(s)
  • virtual center of gravity
  • virtual gravity centre
  • virtual gravity center

French

Domaine(s)
  • Pesanteur (Physique)
  • Constructions navales
CONT

[...] le centre de gravité virtuel est relevé en raison d'un effet de carène liquide [qui] s'ajoute aux effets découlant de la perte de stabilité positive attribuable à la levée de charges à l'aide d'un mât apiqué qui relève davantage le centre de gravité virtuel, et de la diminution de la capacité du bâtiment à se redresser.

Spanish

Save record 1

Record 2 2017-09-12

English

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

A tank which is not completely filled or empty.

CONT

The free surface effect is a mechanism which can cause a watercraft to become unstable and capsize. It refers to the tendency of liquids... to move in response to changes in the attitude of a craft's cargo holds, decks, or liquid tanks in reaction to operator-induced motions... When referring to the free surface effect, the condition of a tank that is not full is described as a "slack tank"...

French

Domaine(s)
  • Transport par eau
  • Mécanique des fluides et hydraulique (Physique)
  • Sécurité (Transport par eau)
Key term(s)
  • citerne partiellement vide

Spanish

Campo(s) temático(s)
  • Transporte por agua
  • Mecánica de fluidos e hidráulica (Física)
  • Seguridad (Transporte por agua)
Save record 2

Record 3 2011-02-09

English

Subject field(s)
  • Biological Sciences
  • Biotechnology
DEF

The immediate vicinity of the bound enzyme.

CONT

There are two distinct ways in which a polymer support might affect the microenvironment surrounding an immobilized enzyme. The first may be considered to be a partitioning effect. By virtue of its own physical chemistry, the polymer may attract(or repel) substrate, product, inhibitor, or other molecules to its surface thus concentrating(or depleting) them in the immediate vicinity of the enzyme. The second way in which the polymer may affect the enzyme's microenvironment may be by presenting itself as a barrier to the free diffusion of molecules both to and from the enzyme.

French

Domaine(s)
  • Sciences biologiques
  • Biotechnologie
DEF

Environnement immédiat dans lequel agit l'enzyme.

CONT

Les conditions de microenvironnement imposées permettent de modifier considérablement la catalyse notamment du point de vue de la spécificité : seules les applications analytiques nécessitent une spécificité absolue. Pour les applications de bioconversions, il est intéressant de pouvoir exploiter pour une large gamme de substrats, une spécificité restreinte (régio- ou stéréospécificité) ex : isomération de glucose en fructose par la xylose isomérase. [...] Cette spécificité peut elle-même dépendre du microenvironnement : ainsi la β galactosidase d'E. Coli ne peut hydrolyser à l'état soluble les galactocérébrosides très hydrophobes. Elle acquiert cette capacité de reconnaissance par inclusion dans des liposomes.

Spanish

Campo(s) temático(s)
  • Ciencias biológicas
  • Biotecnología
Save record 3

Record 4 1999-11-23

English

Subject field(s)
  • International Public Law
  • Political Geography and Geopolitics
CONT

Frontier zones may serve several purposes. The smallest, of a few metres only, will be to mark the frontier, and will involve the destruction of all natural or artificial protrusions from the surface of the earth. Others may be of several kilometres width, and provide for a customs free zone, or, for example, that doctors and midwives may be permitted to practise their profession in the territory adjoining that of their own practice. Such zones are formed in the interests of the local populations on each side of the frontier, in an effort to palliate the disruptive effect of the political frontier.

French

Domaine(s)
  • Droit international public
  • Géographie politique et géopolitique
DEF

zone frontière : Bande de territoire longeant la frontière et soumise à certaines obligations, dans l'intérêt de la défense nationale.

Spanish

Save record 4

Record 5 1990-06-18

English

Subject field(s)
  • Shipbuilding
OBS

As in free surface effect. Effect on stability of ship when a liquid is permitted to move freely from side to side.

French

Domaine(s)
  • Constructions navales

Spanish

Save record 5

Record 6 1979-01-17

English

Subject field(s)
  • Fluid Mechanics and Hydraulics (Physics)
CONT

Consider the effect of rotating a right-circular cylinder(...) about its axis with a peripheral velocity(...) in a fluid otherwise at rest. The fluid in contact with the surface of the cylinder rotates with the cylinder. Fluid at greater radius is also set in motion in concentric circles with velocity diminishing as the radius increase. This type of fluid motion, in which the velocity varies inversely as the radius, is referred to as a free vortex.

Key term(s)
  • free vortices

French

Domaine(s)
  • Mécanique des fluides et hydraulique (Physique)
OBS

Par opposition à "vortex forcé".

Spanish

Save record 6

Record 7 1977-04-07

English

Subject field(s)
  • Cargo (Water Transport)
CONT

Any body of liquid in a ship which has an unconfined upper surface, free to remain parallel to the horizontal as the ship rolls and pitches, is said to have a free surface. Free surface always has a deleterious effect on transverse stability, which varies as the cube of the breadth of the free surface, parallel to the ship's beam.

French

Domaine(s)
  • Cargaisons (Transport par eau)
CONT

Nous savons qu'au point de vue stabilité transversale, un lest liquide à surface libre détermine une diminution de stabilité, par rapport au même lest considéré comme fixe, (...) Il suffit évidemment de supprimer la surface libre de ce liquide pour pouvoir le considérer comme un poids fixe.

Spanish

Save record 7

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