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HEXAGONAL STRUCTURE [20 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2017-04-20

English

Subject field(s)
  • Nuclear Fission Reactors
CONT

The core of a nuclear reactor comprises a central fuel zone, in which a fissile material normally constituted by a [mix] of enriched uranium oxide and plutonium oxide. This fuel zone is completely surrounded by a covering of fertile material normally constituted by depleted uranium oxide. In practice, this structure is obtained by juxtaposing vertical assemblies having a hexagonal section. Each of these assemblies comprises an outer tubular envelope, in which is placed a group or bundle of needles, each containing a pile of fissile and/or fertile material pellets.

French

Domaine(s)
  • Réacteurs nucléaires de fission
CONT

[...] le cœur d'un réacteur est constitué d'assemblages verticaux de section hexagonale ou carrée. Chacun de ces assemblages comprend un faisceau d'aiguilles combustibles ou «éléments combustibles» contenant chacun un empilement de pastilles du matériau à base d'actinide. Le réfrigérant (sodium ou eau) circule autour de chaque élément combustible.

Spanish

Save record 1

Record 2 2016-12-21

English

Subject field(s)
  • Air Pollution
  • Pollutants
CONT

Mineral dust appears a promising source of sublimation nuclei. Dust produced by the disintegration of rocks and blown to fairly high levels is a probable source of supply. Sand from desert regions is another possibility. It is likely that both the mineral dust and the sand contain suitable minerals, such as quartz, which have a hexagonal crystal structure.

CONT

Suspended solids are largely composed of fine mineral particles (silt, clay and colloids) together with varying amounts of animal or plant debris, depending on the season.

OBS

mineral: An inorganic substance.

French

Domaine(s)
  • Pollution de l'air
  • Agents de pollution
CONT

Les particules minérales, comme celles du fer ou du vanadium et d'une façon générale des métaux de transition, catalysent les réactions d'oxydation et d'hydrolyse de l'anhydride sulfureux en acide sulfurique, et ce, notamment, en milieu humide. Les particules organiques peuvent se retrouver dans l'air en grande quantité.

OBS

Le terme «poussière» est généralement synonyme de «particule». Dans un sens plus spécifique, il désigne aussi : une particule solide supérieure à un micron. «Substance minérale», dans un contexte chimique, s'emploie par opposition à «substance organique».

Spanish

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Record 3 2013-11-13

English

Subject field(s)
  • Chemistry
OBS

Alkali Anions. Preparation and Crystal Structure of a compound Which Contains the Cryptated Sodium Cation and the Sodium Anion.... When a saturated solution of sodium metal in ethylamine in the presence of a cation-complexing bicyclic diamino ether("crypt") is cooled, crystals of [a stoichiometric sodium compound] form as thin hexagonal plates.... One of the sodium species is trapped in "crypt" and the other is outside.

French

Domaine(s)
  • Chimie
DEF

Retenir sélectivement des ions alcalins et alcalino-terreux.

CONT

Chaque cage moléculaire peut être adaptée à la taille de l'ion à «crypter» : tel cryptate qui retiendra parfaitement le potassium, ne retiendra ni le lithium (trop petit) ni le césium (trop gros).

Spanish

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Record 4 2013-09-03

English

Subject field(s)
  • Powder Metallurgy
  • Industrial Ceramics
OBS

Silicon carbide exists in two crystalline forms. They are the [alpha]-form which has a hexagonal structure, and the β-form.

OBS

The word "alpha" must be replaced by the corresponding greek letter.

Key term(s)
  • a silicon carbide
  • a-SiC

French

Domaine(s)
  • Métallurgie des poudres
  • Céramiques industrielles
OBS

Le carbure de silicium possède deux structures cristallines principales : la structure hexagonale dite SiCα.

OBS

Le mot «alpha» doit être remplacé par la lettre grecque équivalente.

Key term(s)
  • carbure de silicium a
  • SiCa

Spanish

Save record 4

Record 5 2012-01-04

English

Subject field(s)
  • Atmospheric, Climatic and Meteorological Phenomena
DEF

One of the many geometrical forms in which ice crystals are found in the atmosphere.

CONT

The dominant snow crystal illustrated... is a hexagonal plate with six radiating arms. However, associated with the surface of the central plate and extending into the arms are numerous spherical "droplets". These particles, which are about 0. 03 to 0. 05 mm in diameter, are consistent with the descriptions of cloud particles or supercooled water droplets that have been described in light microscopic examinations of snow crystals(Bentley and Humphreys, 1931; Nakaya, 1954). The radiating arms contain another type of surface structure, namely small microcrystals that consist of short hexagonal columns most of which are only 0. 05 to 0. 10 mm in diameter. Some of these structures appear to be transitional stages that arise from the droplets.

OBS

Snowflakes can be described by their geometric shapes, or variations of them, such as prismatic column, hexagonal plate, cup, hexagonal column, needle, flat plate, and dendrite.

French

Domaine(s)
  • Phénomènes météorologiques, climatiques et atmosphériques
CONT

Il est essentiel qu'il y ait des cirrus ou des cirrostratus, car c'est grâce à eux que sont formés les halos. Ces nuages élevés sont formés de cristaux de glace circulant uniquement dans les plus hautes couches de la troposphère. Le phénomène des halos est causé par la réfraction et la réflexion de la lumière sur ces minuscules cristaux de glace. [...] Le halo résulte de la chute désordonnée de colonnes hexagonales, mais seules les colonnes orientées correctement à tout moment arriveront à créer les halos.

Spanish

Save record 5

Record 6 2009-10-11

English

Subject field(s)
  • Nuclear Fission Reactors
  • Nuclear Power Stations
CONT

In practice, this structure is obtained by juxtaposing vertical assemblies having a hexagonal section. Each of these assemblies comprises an outer tubular envelope, in which is placed a group or bundle of needles, each containing a pile of fissile and/or fertile material pellets... the term "fuel needle" or nuclear fuel needle [is also] used for the needles contained in these fissile assemblies.

French

Domaine(s)
  • Réacteurs nucléaires de fission
  • Centrales nucléaires
CONT

Démantèlement des assemblages. L'ouverture du TH [tube hexagonal] est pratiquée à la cellule d'examen de la centrale Phénix par fraisage mécanique sur l'angle du TH, l'assemblage comportant à cet endroit une aiguille postiche pour éviter le risque d'endommagement d'aiguille combustible.

Spanish

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Record 7 2009-09-17

English

Subject field(s)
  • Physics
  • Mineralogy
CONT

From a technical point of view presents the Titanium, at temperatures less than 882°C, a compact hexagonal crystal structure(alpha Titanium) with a melting point much higher in 1660°C.

French

Domaine(s)
  • Physique
  • Minéralogie
CONT

Dès que la proportion d'étain formée atteint 2 %, il apparaît une nouvelle phase de structure cristallographique hexagonale compacte (hc) moins dense qui contribue à amplifier le gonflement.

Spanish

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Record 8 2004-12-06

English

Subject field(s)
  • Atmospheric, Climatic and Meteorological Phenomena
  • The Sun (Astronomy)
CONT

A solar halo is a luminous ring that is sometimes seen surrounding the Sun. Some parts of the halo are very bright, others are not very bright. Sometimes, only a part of the ring is visible. Within the solar halo, on opposite sides of the Sun, there can be two very bright spots called "sun dogs" or "mock suns. "The halo is produced as sunlight is reflected and refracted through tiny, flat ice crystals in the atmosphere. Sun dogs and halos always are at an angle of 22° away from the Sun, due to the hexagonal structure of the ice crystals. The diameter of the halo is about an eighth of the sky.

French

Domaine(s)
  • Phénomènes météorologiques, climatiques et atmosphériques
  • Soleil (Astronomie)
CONT

Contrairement aux couronnes, les halos ne touchent pas le soleil ou la lune; ils sont des cercles de lumière causés par la réfraction des rayons lumineux par des cristaux de glace. Les différentes formes de cristaux pointant dans différentes directions sont responsables des différentes formes de halos. Les halos solaires sont assez fréquents, mais peu de gens les observent car le ciel est généralement trop lumineux quand ils se forment. Ils présentent habituellement en leur partie interne, une coloration rouge pâle, se dégradant souvent en jaune, vert, blanc et, en leur partie externe, un bord bleu ou violet. Ils ont parfois la forme de bandes, d'arcs ou de cercles lumineux, de colonnes lumineuses verticales ou horizontales, souvent réduites à des taches, partant de l'astre lumineux.

Spanish

Campo(s) temático(s)
  • Fenómenos meteorológicos, climáticos y atmosféricos
  • Sol (Astronomía)
Save record 8

Record 9 2004-02-12

English

Subject field(s)
  • Facilities and Instruments (Astronomy)
  • Astronautics
DEF

A construction method for a large mirror in which the back is hollowed-out to leave a ribbed structure that resembles a honeycomb.

CONT

We report on the casting of the first 8. 4 meter diameter borosilicate honeycomb mirror at the Steward Observatory Mirror Laboratory. This blank will become the world's largest monolithic glass telescope mirror, and is the first of two mirrors for the Large Binocular Telescope Project. The honeycomb 8. 4 meter mirror was cast from 21 tons of E6 borosilicate glass manufactured by Ohara. This glass is melted into a mold constructed of aluminosilicate fiber to produce a honeycomb structure with roughly 20% of solid density. The 1662 hexagonal voids that form the honeycomb structure are produced by ceramic fiber boxes bolted to the bottom of the mold with SiC bolts. The furnace rotates at 6. 8 rpm during the casting process to produce the F/1. 14 paraboloid on the front surface. This shaping minimizes the amount of glass which must be removed during the grinding process. The front faceplate of the mirror will be 28 mm thick after generating and the back faceplate will be 25 mm. The overall thickness of the finished honeycomb blank is 89 cm at the outer edge and 44 cm at the central hole.

French

Domaine(s)
  • Installations et instruments (Astronomie)
  • Astronautique
CONT

Le miroir alvéolé [permet] de conserver le bon rapport épaisseur/diamètre pour assurer la rigidité, mais de diminuer la masse en laissant des alvéoles vides dans l'épaisseur du verre: on parle aussi de «miroir en nid d'abeilles». [Une technique novatrice] mise au point par Roger Angel (Université Steward, Arizona) [consistait à] mettre en place les alvéoles dès le coulage du verre, évitant ainsi le travail d'évidement ultérieur. [...] un four tournant, [permettait] de donner au miroir une forme parabolique pendant son refroidissement [..]

OBS

Cette méthode de fabrication a été mise au point sur des miroirs de plus en plus grands, en commençant par un miroir de 3,50m pour le télescope WYNN à Kitt Peak (Arizona). Les premiers «grands» miroirs ont été coulés pour le MMT (ex Multi Mirror Telescope), puis pour les deux télescopes Magellan de 6.50m, et en ce moment, pour le premier des deux miroirs de 8,4m du LBT (Large Binocular Telescope).

Spanish

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Record 10 2003-12-22

English

Subject field(s)
  • Orbital Stations
CONT

This truss segment, called "P1," is a 46-by-15 foot structure weighing about 32,000 pounds when fully outfitted and ready for launch.

CONT

The P1 Truss, the first port truss segment, was attached to the port side of the S0 truss ... The P1 Truss provides structural support for the Active Thermal Control System, Mobile Transporter and one Crew and Equipment Translation Aid cart. ... The P1 Truss also has mounts for cameras and lights, and antenna support equipment for both UHF [Ultra High Frequency] and S-band communications equipment. The S-band equipment is currently on the P6 Truss.

CONT

The main truss segments-S0, P1, S1, P3, and S3-were designed as rigid hexagonal sections; a six-point structure is more rigid than one with four points. The hexagonal cross section also maximizes the volume that can be used to load equipment onto the truss. A square will not use the available volume as well as a hexagon.... The truss segments are not regular hexagons; the sides are not equal in length. The segments are wider than they are tall to further exploit the Shuttle payload bay area...

OBS

P1 truss; integrated truss structure P1; P1; ITS-P1: terms and abbreviations officially approved by the International Space Station official approval Group (ISSOAG).

French

Domaine(s)
  • Stations orbitales
CONT

[...] l'équipage de STS 113 installeront le troisième segment de l'immense poutrelle qui portera éventuellement les panneaux solaires (générant l'électricité) et les grands radiateurs (évacuateurs de chaleur). Il s'agit de la pièce dite P1, la première portion bâbord (gauche) de la poutrelle. Ce segment est identique au S1 (premier segment tribord, droit) installé en octobre. Au terme de cette opération d'assemblage, la poutrelle mesurera 40,5 mètres (elle fera, à terme, 108 mètres).

OBS

poutre P1; segment de poutre intégrée P1; P1; ITS-P1 : termes et abréviations uniformisés par le Groupe de travail de la terminologie de la Station spatiale internationale (GTTSSI).

Spanish

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Record 11 2003-10-29

English

Subject field(s)
  • Atmospheric Physics
  • The Moon (Astronomy)
CONT

A lunar halo is a luminous ring that is sometimes seen surrounding the moon. Some parts of the halo are very bright, others are not very bright. Sometimes, only a part of the ring is visible. The halo is produced as moonlight is reflected and refracted through tiny, flat ice crystals in the atmosphere. Halos always are at an angle of 22° away from the moon, due to the hexagonal structure of the ice crystals. The diameter of the halo is about an eighth of the sky.

French

Domaine(s)
  • Physique de l'atmosphère
  • Lune (Astronomie)
CONT

Contrairement aux couronnes, les halos ne touchent pas le soleil ou la lune; ils sont des cercles de lumière causés par la réfraction des rayons lumineux par des cristaux de glace. Les différentes formes de cristaux pointant dans différentes directions sont responsables des différentes formes de halos. [...] On peut également observer des halos autour de la pleine lune. Selon le dicton : «lune cerclée, pluie assurée», il semble qu'une fois sur deux la pluie ou la neige tombe un ou deux jours après l'observation d'un halo lunaire.

Spanish

Campo(s) temático(s)
  • Física de la atmósfera
  • Luna (Astronomía)
Save record 11

Record 12 2002-11-28

English

Subject field(s)
  • Orbital Stations
CONT

P3 attached site ... is planned for ISS [International Space Station] logistics support. ... Interfaces are the same as the S3 sites.

CONT

The main truss segments-S0, P1, S1, P3, and S3-were designed as rigid hexagonal sections; a six-point structure is more rigid than one with four points. The hexagonal cross section also maximizes the volume that can be used to load equipment onto the truss. A square will not use the available volume as well as a hexagon.... The truss segments are not regular hexagons; the sides are not equal in length. The segments are wider than they are tall to further exploit the Shuttle payload bay area... The hexagonal truss segments also contain a robotic manipulator arm that travels along two longerons on one plane of the hexagonal truss. The 55 ft(17 m) long robotic arm being built by the Canadian Space Agency will be launched with the S0 segment and will travel the length of the truss.

OBS

P3 truss; integrated truss structure P3; P3; ITS-P3: terms and abbreviations officially approved by the International Space Station official approval Group (ISSOAG).

French

Domaine(s)
  • Stations orbitales
CONT

Mission STS-115 (12A) avec la navette Endeavour transportant les sections de poutre P3 et P4, incluant de nouveaux panneaux solaires.

OBS

poutre P3; segment de poutre intégrée P3; P3; ITS-P3 : termes et abréviations uniformisés par le Groupe de travail de la terminologie de la Station spatiale internationale (GTTSSI).

Spanish

Save record 12

Record 13 2002-11-28

English

Subject field(s)
  • Orbital Stations
CONT

The main truss segments S0, P1, S1, P3, and S3 were designed as rigid hexagonal sections; a six-point structure is more rigid than one with four points. The hexagonal cross section also maximizes the volume that can be used to load equipment onto the truss. A square will not use the available volume as well as a hexagon.... The truss segments are not regular hexagons; the sides are not equal in length. The segments are wider than they are tall to further exploit the Shuttle payload bay area.... The hexagonal truss segments also contain a robotic manipulator arm that travels along two longerons on one plane of the hexagonal truss.

OBS

S3 truss; integrated truss structure S3; S3; ITS-S3: terms and abbreviations officially approved by the International Space Station official approval Group (ISSOAG).

French

Domaine(s)
  • Stations orbitales
OBS

poutre S3; segment de poutre intégrée S3; S3; ITS-S3 : termes et abréviations uniformisés par le Groupe de travail de la terminologie de la Station spatiale internationale (GTTSSI).

Spanish

Save record 13

Record 14 2000-05-01

English

Subject field(s)
  • Types of Constructed Works
  • Residential Architecture
CONT

Plywood Dome House Construction Plans. This detailed set of instructions will allow you to make your own versatile wooden dome structure, whether for a house, garage, greenhouse, weekender or storage hut. The simply explained theory behind the strength of dome construction is included and thoroughly covered before construction commences. Cheaper and easier to make than almost any other abode, the wooden dome can take less than a week to erect for 2 people working together. The basic building parts of panels, stiffeners, gussets, ribs and plates are put together like a mechano set using hexagonal head coach screws, washers, nails and anchor bolts for the floor attachment. Aesthetically pleasing and with a spacious interior feeling, the dome gives a harmonious dimension to any environmental setting.

French

Domaine(s)
  • Types de constructions
  • Architecture d'habitation
CONT

Entreprise. Domespace (Maisons tournantes en forme de dôme - France.

Spanish

Save record 14

Record 15 1999-10-12

English

Subject field(s)
  • Metallography
DEF

hexagonal closed-packed structure : close-packed crystal structure characterized by the regular alternation of two layers; the atoms in each layer lie at the vertices of a series of equilateral triangles, and the atoms in one layer lie directly above the centers of the triangles in neighboring layers.

Key term(s)
  • close-packet hexagonal structure

French

Domaine(s)
  • Métallographie

Spanish

Save record 15

Record 16 1997-05-21

English

Subject field(s)
  • Metallography
DEF

A plane perpendicular to the principal axis(c axis) in a tetragonal or hexagonal structure.

French

Domaine(s)
  • Métallographie
DEF

Plan perpendiculaire à l'axe c d'une structure quadratique ou hexagonale.

Spanish

Save record 16

Record 17 1996-02-26

English

Subject field(s)
  • Metallurgy - General
DEF

The anodic oxide film structure, usually a hexagonal configuration with a centre pore constituting the main body of the oxide. A thin barrier layer exists at the interface between the aluminium metal surface and the porous oxide layer.

OBS

Term and definition standardized by ISO.

French

Domaine(s)
  • Métallurgie générale
DEF

Structure du film d'oxyde anodique correspondant habituellement à une configuration hexagonale avec un pore central qui constitue la partie principale de l'oxyde. Une couche barrière mince se situe à l'interface entre la surface métallique de l'aluminium et la couche poreuse d'oxyde.

OBS

Terme et définition normalisés par l'ISO.

Spanish

Save record 17

Record 18 1994-02-09

English

Subject field(s)
  • Mathematics
  • Computer Graphics
CONT

Among two-dimensional periodic patterns, the most famous is Benard's convective cell. This cell is formed as a result of thermal convection.... In a liquid layer heated from below there appear ascending and descending streams. As a result of these convective motions, a hexagonal structure resembling a honeycomb may appear. For many years this structure has served as an example of a wonderful phenomenon of self-organization in continuous media.

French

Domaine(s)
  • Mathématiques
  • Infographie
DEF

Propriété autorégulatrice, découverte récemment, d'un système dynamique loin de l'équilibre.

OBS

Le système se construit lui-même à partir d'un arrière plan chaotique en organisant l'espace, en donnant une direction au temps, en évoluant et en changeant constamment. Il n'est jamais totalement identique même s'il conserve son organisation de base.

Spanish

Save record 18

Record 19 1990-09-06

English

Subject field(s)
  • Plant Diseases
OBS

Lucerne(alfalfa) transient streak virus particles are angular, usually hexagonal, with no apparent subunit structure.

OBS

Transient streak in alfalfa was recently observed and studied in Australia.

French

Domaine(s)
  • Maladies des plantes

Spanish

Save record 19

Record 20 1989-07-30

English

Subject field(s)
  • Industrial Ceramics
  • Chemistry
CONT

Silicom carbide exists in two crystalline forms. They are the alpha-form which is cubic.

French

Domaine(s)
  • Céramiques industrielles
  • Chimie
CONT

Le carbure de silicium possède deux structures cristallines principales : la structure hexagonale dite SiC alpha, la structure cubique dite SiC béta.

Spanish

Save record 20

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