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HEAD END PRESSURE [7 records]

Record 1 2005-07-20

English

Subject field(s)
  • Weather Stations and Meteorological Instruments and Equipment
DEF

A type of pressure-tube anemometer, named after the inventor, in which the pressure head is located on the windward end of the wind vane so that it is kept facing into the wind.

CONT

The Dines Pressure Tube Anemometer is universally recognised as the most reliable and accurate instrument of its kind and has been adopted as standard by the British Meteorological Office and by meteorological stations world-wide. Dines Pressure Tube Anemometer consists essentially of a Head Assembly, a Velocity Recorder and a Direction Recorder, the IM100 records wind speed and wind direction simultaneously on a single chart. An important feature of the Dines, is that it records not only average wind velocity over a given time, but also variations in wind force, with the strength and frequency of gusts, providing valuable data on the internal structure of the wind.

CONT

The suction head is mounted concentrically with the shaft, near the bearing that supports the vane, and develops a suction that is independent of wind direction. The pressure difference between the suction head and the pressure head is proportional to the square root of the wind speed and is measured by a specially designed float manometer with a linear wind scale.

CONT

The Dines anemometer was first described by William Henry Dines in 1892 and had all the essentials of the final form of the pressure-tube anemometer. With various modifications, the Dines anemometer remained a useful wind measuring device into the 1960s.

Key term(s)
  • Dines pressure-tube anemometer

French

Domaine(s)
  • Stations, instruments et équipements météorologiques
CONT

Selon leur principe de fonctionnement, les capteurs de la vitesse ou/et de la direction du vent peuvent être classés en quatre catégories. Ainsi, on distingue ceux qui sont sensibles [...] à la pression du fluide : le tube de Pitot ou l'anémomètre de Dines (ancienne version du tube de Pitot, largement utilisée dans les années trente pour les observations météorologiques) [...]

Spanish

Campo(s) temático(s)
  • Estaciones, instrumentos y equipos meteorológicos
Save record 1

Record 2 1998-02-27

English

Subject field(s)
  • Plastics Manufacturing
CONT

A reciprocating screw machine is shown in Figure 12-18. As the screw rotates, melted plastic is pushed forward to the end of the extruder barrel, and the pressure pushes the screw in the opposite direction. When the necessary amount of melt has collected, a hydraulic cylinder moves the screw forward, forcing plastic out of the die head to form the parison(s).

Key term(s)
  • reciprocating screw blow moulder
  • reciprocating screw extrusion blow molder
  • reciprocating screw extrusion blow moulder
  • reciprocating screw extrusion blow-molder
  • reciprocating screw extrusion blow-moulder
  • reciprocating screw-extrusion blow-moulder

French

Domaine(s)
  • Plasturgie
OBS

Transfert par vis-piston, système vis-piston.

Spanish

Save record 2

Record 3 1995-05-15

English

Subject field(s)
  • Water Treatment (Water Supply)
  • Food Industries
CONT

The design of the hollow fiber membrane module uses the fibers in a half loop with the free ends potted in epoxy resin. The loop end is contained in a pressure vessel. Feed solution is introduced around the outside of the hollow fiber. Filtrate passes through the fiber walls and flows up the bore to the open end of the fiber at the epoxy head. Brine is discharged from the opposite end of the pressure vessel.

French

Domaine(s)
  • Traitement des eaux
  • Industrie de l'alimentation
DEF

Module constitué d'un très grand nombre de fibres creuses assemblées en U ou en longueurs parallèles ou croisées, à l'intérieur d'un carter de géométrie tubulaire.

OBS

Le sens de la filtration peut avoir lieu de l'intérieur vers l'extérieur des fibres ou inversement.

OBS

Les modules fibres creuses ont pour avantage leur compacité, leur faible coût à l'achat et à l'entretien et leur faible consommation énergétique. Dans le cas où la séparation est effectuée de l'intérieur vers l'extérieur, les modules fibres creuses sont inadaptés aux produits visqueux ou chargés en particules.

Spanish

Save record 3

Record 4 1990-05-22

English

Subject field(s)
  • Motors (Machinery)
  • Kinematics

French

Domaine(s)
  • Moteurs mécaniques
  • Cinématique (Mécanique)

Spanish

Save record 4

Record 5 1987-01-16

English

Subject field(s)
  • Facilities and Equipment (Wood Industries)
CONT

The double-end tenoner... is designed to handle stock that has been previously sorted to length. The workpiece is carried through the machine on two traveling chains and is held down in the cutting zone by two rubber-faced, overhead, traveling chains that are supported by two pressure bars.... Standard cutterhead equipment installed on each end of the double-end tenoner would include one tilting cut-off saw, one top horizontal tenon head, one bottom horizontal tenon head, and one tilting vertical cope head, all in the order named.

French

Domaine(s)
  • Installations et équipement (Industr. du bois)
DEF

Tenonneuse à alimentation automatique ou semi-automatique, constituée de deux machines simples à écartement réglable, montées sur une base commune, permettant l'usinage simultané de deux tenons à chaque extrémité d'une pièce (...)

CONT

Outre la fabrication de tenons, la tenonneuse double peut effectuer de nombreuses autres opérations d'usinage (rainurage, moulurage, profilage, perçage, défonçage) par l'adjonction d'outils et d'accessoires.

Key term(s)
  • tenoneuse double

Spanish

Save record 5

Record 6 1986-11-26

English

Subject field(s)
  • Civil Engineering
  • Transport of Water (Water Supply)
DEF

A gate with a flap suspended from a free swinging horizontal hinge, normally placed at the end of a conduit discharging into a body of water having a fluctuating surface elevation. The gate is usually closed because of external hydraulic pressure, but will open when the internal head is sufficient to overcome the external pressure, the weight of the flap, and the friction of the hinge.

French

Domaine(s)
  • Génie civil
  • Adduction d'eau (Alimentation en eau)
DEF

Ouverture par laquelle l'eau peut couler librement en direction de la mer, mais qui se ferme automatiquement pour empêcher l'eau de mer de couler dans la direction contraire.

Spanish

Save record 6

Record 7 1986-04-23

English

Subject field(s)
  • Transport of Water (Water Supply)
DEF

A nozzle, often used for sprinkling, which has a cup at the end of the nozzle and a ball within the cup. The jet issuing from the nozzle strikes the ball and is deflected sideways in all directions. When the nozzle is in operation, the ball is held close to the tip of the nozzle by atmospheric pressure, while the negative pressure head is caused by the high velocity of the sheet of water around the ball.

French

Domaine(s)
  • Adduction d'eau (Alimentation en eau)
DEF

Ajutage comportant à son extrémité un évasement et une sphère à l'intérieur.

Spanish

Save record 7

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