TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 CONT

The double helix described by Watson and Crick ... is called the B-form of DNA.  1, record 1, English, - B%2Dform%20of%20DNA

Record number: 1, Textual support number: 1 OBS

Its [B-form] characteristics features lie in its dimensions : a helical diameter of 2. 37 nm(nanometers), a rise of 0. 34 nm per base pair, and a pitch(i. e. distance taken up by a complete turn of the helix) of 3. 4 nm, this corresponding to ten base pairs per turn.  1, record 1, English, - B%2Dform%20of%20DNA

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 OBS

Il s'agit de la forme la plus courante de l'ADN, soit celle qui a été décrite par Watson et Crick.  3, record 1, French, - forme%20B%20de%20l%27ADN

Record number: 1, Textual support number: 2 OBS

La forme B de l'ADN se caractérise par le diamètre de l'hélice de 2,37 nm (nanomètres), la distance entre les paires de bases de 0,34 nm, et le pas de l'hélice (distance entre deux points sur une projection horizontale) de 3,4 nm, soit l'équivalent de 10 paires de bases par tour.  3, record 1, French, - forme%20B%20de%20l%27ADN

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 DEF

... the amount by which a point on the helix is displaced, in a direction parallel to the axis, in making one revolution about the axis.  1, record 2, English, - pitch%20of%20a%20helix

Record number: 2, Textual support number: 1 OBS

helix : A twisted curve whose tangent always makes a constant angle with a fixed line, called the axis of the helix.  1, record 2, English, - pitch%20of%20a%20helix

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 OBS

Un cas particulier important est celui de l'hélice circulaire, dont le cylindre (C) correspondant est un cylindre de révolution. Pour la caractériser, il faut connaître son axe et son rayon r [...], son sens d'enroulement [...] et son pas h (longueur constante qui sépare deux points d'intersection consécutifs d'une génératrice fixe, avec (H].  2, record 2, French, - pas%20de%20l%27h%C3%A9lice

Record number: 2, Textual support number: 2 OBS

hélice : Courbe le plus souvent gauche, dont les tangentes font un angle constant avec une direction donnée.  2, record 2, French, - pas%20de%20l%27h%C3%A9lice

Record 2,  Textual support,  Spanish

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 DEF

The intersection of a tooth flank with the pitch cylinder of a helical gear.  1, record 3, English, - pitch%20helix

Record number: 3, Textual support number: 1 OBS

Term and definition standardized by ISO.  2, record 3, English, - pitch%20helix

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 DEF

Intersection d'un flanc avec le cylindre primitif de fonctionnement d'une roue hélicoïdale.  1, record 3, French, - h%C3%A9lice%20primitive%20de%20fonctionnement

Record number: 3, Textual support number: 1 OBS

Terme et définition normalisés par l'ISO.  2, record 3, French, - h%C3%A9lice%20primitive%20de%20fonctionnement

Record 3,  Textual support,  Spanish

Record 4,  Textual support,  English

Record number: 4, Textual support number: 1 CONT

Unified and American National screw thread standards for screws, bolts, nuts, and other threaded parts consist of six series of threads and selection of special threads that cover nonstandard combinations of diameter and pitch. In general, the unified screw threads are limited to three series : coarse(UNC), fine(UNF), and extrafine(UNEF). A 1/4-inch.-diameter thread in the UNC series has 20 threads/in., while in the UNF series it has 28. In the unified and American National standards, the coarse thread series(UNC and NC) is recommended for general industrial use on threaded machine parts and for screws and bolts. Because a coarse thread has fewer threads per inch than a fine thread of the same diameter, the helix angle is greater, and the thread travels farther in one turn. A coarse thread is preferred when rapidity and ease of assembly are desired, and where strength and clamping power are not of prime importance.  2, record 4, English, - Unified%20National%20Coarse%20screw%20thread

Record number: 4, Textual support number: 2 CONT

Threads are designated by standardized notes. Under the unified system, threads are specified by giving in order the nominal diameter, number of threads per inch, the initial letters such as UNC or UNF that identify the series, and class of thread (1A, 2A, and 3A or 1B, 2B and 3B). Threads are considered to be right-hand and single unless otherwise noted; therefore the specification for a left-hand thread must have the letters LH included.  2, record 4, English, - Unified%20National%20Coarse%20screw%20thread

Record number: 4, Textual support number: 3 CONT

[Example of a thread identification by standardized symbols]: 1/2-13UNC-2ALH.  2, record 4, English, - Unified%20National%20Coarse%20screw%20thread

Record 4,  Textual support,  French

Record number: 4, Textual support number: 1 CONT

Norme BS 1580 : 1953 "Unified Screw Threads". Il s'agit des filetages cylindriques de mécanique générale, au profil ISO, mais avec les cotes en pouces. Depuis 1949, le Royaume-Uni, le Canada et les États-Unis se sont mis d'accord sur ces filetages et leur désignation : "UNC" pour "Unified coarse thread" (gros pas)"; "UNF" pour "Unified fine thread"(pas fin); "UNEF" pour "Unified extra-fine thread" (pas extra-fin); "UN" pour "Unified constant pitch" (pas constant). Ces filetages figurent [...] d'une manière plus complète dans la norme américaine ASA B1.1-1960 qui concerne les filetages unifiés.  1, record 4, French, - filetage%20unifi%C3%A9%20%C3%A0%20gros%20pas%20UNC

Record 4,  Textual support,  Spanish

Record 5,  Textual support,  English

Record number: 5, Textual support number: 1 CONT

Unified and American National screw thread standards for screws, bolts, nuts, and other threaded parts consist of six series of threads and a selection of special threads that cover nonstandard combinations of diameter and pitch. In general, the unified screw threads are limited to three series : coarse(UNC), fine(UNF), and extrafine(UNEF). A 1/4-inch-diameter thread in the UNC series has 20 threads/in., while in the UNF series it has 28. In the Unified and American National standards, the coarse thread series(UNC and NC) is recommended for general industrial use on threaded machine parts and for screws and bolts. Because a coarse thread has fewer threads per inch than a fine thread of the same diameter, the helix angle is greater, and the thread travels farther in one turn. A coarse thread is preferred when rapidity and ease of assembly are desired, and where strength and clamping power are not of prime importance.  3, record 5, English, - American%20National%20Coarse%20Thread

Record 5,  Textual support,  French

Record number: 5, Textual support number: 1 OBS

Série à filets gros : Pour pièces et équipement ordinaires dans l'industrie et le commerce.  4, record 5, French, - filetage%20NC%20%C3%A0%20gros%20pas

Record number: 5, Textual support number: 2 OBS

"UNC"="Unified coarse thread" (gros pas).  5, record 5, French, - filetage%20NC%20%C3%A0%20gros%20pas

Record 5,  Textual support,  Spanish

Record 6,  Textual support,  English

Record number: 6, Textual support number: 1 CONT

The Robertson engine. This device was not specifically designed with geothermal application in view : it was intended to operate on a variety of working fluids, but the inventor considers that it should also be suitable for extracting energy from geothermal fluids-water and/or steam.... It has a tapered rotor revolving within a tapered stator. The rotor has a "single-start" helix, while the stator has a "double start" helix of exactly twice the rotor pitch. The rotor is mounted on a crank, and its rotation on the crank-pin is governed by gears so that each cross-section of the rotor oscillates within the stator as it revolves. This arrangement gives rise to a series of trapped volumes which expand progressively from one end of the machine to the other as the rotor rotates.  1, record 6, English, - Robertson%20engine

Record 6,  Textual support,  French

Record 6,  Textual support,  Spanish