TERMIUM Plus^®

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In the presense of an external magnetic field, the energy levels of atoms are split. This splitting is described well by the Zeeman effect if the splitting is small compared to the energy difference between the unperturbed levels, i. e., for sufficiently weak magnetic fields. This can be visualized with the help of a vector model of total angular momentum. If the magnetic field is large enough, it disrupts the coupling between the orbital and spin angular momenta, resulting in a different pattern of splitting. This effect is called the Paschen-Back effect.  1, fiche 1, Anglais, - Paschen%2DBack%20effect

Fiche 1,  Justifications,  Français

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Les moments angulaires jouent un rôle essentiel dans les propriétés des noyaux atomiques. Ils renseignent sur [...] - les effets atomiques observés en présence d'un champ magnétique (effet Zeeman, effet Paschen-Back), par exemple, et révélant la structure atomique hyperfine [...]  1, fiche 1, Français, - effet%20Paschen%2DBack

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Fiche 2,  Justifications,  Anglais

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Procedure based on the formation of a diazo linkage between enzyme proteins and aryldiazonium electrophilic groups on the insoluble support. Supports containing aromatic amino groups are treated with sodium nitrite in acidic solutions and the resultant activated support reacts with aromatic residues such as the phenolic residue of L-tyrosine or the imidazole residue of L-histidine to give azo derivatives.  1, fiche 2, Anglais, - diazotization

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There are many commercial diazonium salts used as azo coupling reagents, which are usually in a stabilized form(a stable diazotate) produced by reaction with alkali(forming the free base) or with zinc chloride(forming a diazo double salt)... Diazonium ions are weak electrophiles; they react with highly reactive aromatic compounds-with phenols and tertiary aromatic amines-to yield azo compounds... Azo coupling of proteins can be effected by polymers containing aryldiazonium functional groups... Monomers containing aromatic nitro groups grafted onto polymers have been reduced, diazotized, and used to immobilize enzymes.  3, fiche 2, Anglais, - diazotization

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Bien avant que l'on ne songeât à immobiliser des enzymes à des fins industrielles, on savait [...] immobiliser les protéines que sont les anticorps, par diazotation, sans leur faire perdre leur activité biologique. Ce sont les développements de ces techniques qui ont permis l'apparition du génie enzymatique.  2, fiche 2, Français, - diazotation

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Parmi les supports activés de cette manière, le p. aminobenzoylcellulose ou le verre sont fréquemment employés.  3, fiche 2, Français, - diazotation

Fiche 2,  Justifications,  Espagnol

Fiche 3,  Justifications,  Anglais

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In a collaborative project with the Canadian Space Agency, two vibration isolation systems for zero-g environments have been developed-the Motion Isolation Mount(MIM) for orbital flights and the Large Motion Isolation Mount(LMIM) for parabolic flights. The approach taken for MIM has been to develop a mechanism having two parts : a stator attached to the structure and a payload-carrying flotor, with the only coupling between the two components being a flexible umbilical carrying signals and power to the flotor. The flotor is actively magnetically levitated by a set of wide-gap voice coil actuators. Its position relative to the stator is sensed by an optical position sensor while its absolute acceleration is sensed by an inertial accelerometer system. A digital controller uses the sensed information to compute actuator currents based on a control law that regulates acceleration and steady-state position to zero. The weak coupling between stator and flotor and the insensitivity of actuator force with position makes such a system extremely effective for vibration isolation...  2, fiche 3, Anglais, - motion%20isolation%20mount

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motion isolation mount; MIM: term and abbreviation officially approved by the International Space Station official approval Group (ISSOAG).  3, fiche 3, Anglais, - motion%20isolation%20mount

Fiche 3,  Justifications,  Français

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L'ESA [European Space Agency] a donné le mandat à l'ASC [Agence spatiale canadienne] d'adapter le Support d'isolation contre les vibrations en microgravité (MIM) de façon à ce qu'il puisse être utilisé avec le Laboratoire des sciences des fluides (FSL) qui sera envoyé à bord de la Station spatiale internationale (ISS) en 2004. [...] MIM est un système de lévitation magnétique à six degrés de liberté conçu pour isoler les expériences d'accélérations vibratoires (>0.01 Hz) sur la navette spatiale, Mir et l'ISS. MIM a été utilisé sur la station spatiale Mir de mai 1996 à janvier 1998. Une seconde génération de MIM, connue sous le nom de MIM-2, a volé à bord de la navette spatiale lors de la mission STS-85 en août 1997.  4, fiche 3, Français, - support%20d%27isolation%20contre%20les%20vibrations%20en%20microgravit%C3%A9

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support d'isolation contre les vibrations en microgravité; MIM : terme et abréviation uniformisés par le Groupe de travail de la terminologie de la Station spatiale internationale (GTTSSI).  5, fiche 3, Français, - support%20d%27isolation%20contre%20les%20vibrations%20en%20microgravit%C3%A9

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Fiche 4,  Justifications,  Anglais

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If reception is weak and noisy check the aerial coupling circuit especially in "universal" sets, you may find that the coupling windings on the tuned circuit coils are burnt out.  2, fiche 4, Anglais, - aerial%20coupling%20circuit

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Fiche 4,  Justifications,  Espagnol