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AbstractAbstract
[en] Additions of a few parts per thousand of oxygen to a CO-He mixture change drastically the laser output power, the axial field in the positive column, and the slope of the E-I curve of the discharge. The intensity of the spectrum of vibrational transitions of the CO molecule increases when oxygen is added; the increase is especially pronounced for transitions from higher (u greater than 7) levels. The most prominent feature in the visible spectrum is the disappearance of the C2-Swan bands with the addition of oxygen. The populations of CO vibrational levels were derived from the IR spectra; they increase by more than an order of magnitude for u greater than 7. The electron energy distribution was derived from measured E/N and the Boltzmann equation. Oxygen affects the Boltzmann equation (and thus the electron energy-distribution function) through the change in E/N, which is in turn determined by ionization and deionization processes. The fractional power transfer from electrons increases to vibrational levels and decreases to electronic levels
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Journal Article
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IEEE (Inst. Electr. Electron. Eng.) J. Quant. Electron; v. QE-11(8); p. 590-594
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AbstractAbstract
No abstract available
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2001 spring meeting of Arbeitskreis Atome, Molekuele Quantenoptik und Plasmen (AMOP) and Fachverband Kurzzeitphysik der Deutschen Physikalischen Gesellschaft e.V. (DPG) and 7. European Conference on Atomic and Molecular Physics (ECAMP), with physics and book exhibition; Fruehjahrstagung 2001 des Arbeitskreises Atome, Molekuele Quantenoptik und Plasmen (AMOP) und des Fachverbandes Kurzzeitphysik der Deutschen Physikalischen Gesellschaft e.V. (DPG) und 7. European Conference on Atomic and Molecular Physics (ECAMP), mit Physik- und Buchausstellung; Berlin (Germany); 2-6 Apr 2001
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Journal Article
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Verhandlungen der Deutschen Physikalischen Gesellschaft; ISSN 0420-0195;
; CODEN VDPEAZ; v. 36(5); p. 121

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AbstractAbstract
[en] It is analyzed how small oxygen additions in vanadium carbide affect short-range order. It can be assumed that short-range order in the studied compounds refers to homogeneous type, oxygen introduction into VCx results in the decrease of the short-range order degree in arrangement of vacancies
Original Title
Vliyanie kisloroda na blizhnij poryadok v raspolozhenii vakansij v VCx
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Journal Article
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Izvestiya Akademii Nauk SSSR, Neorganicheskie Materialy; ISSN 0002-337X;
; CODEN IVNMA; v. 24(3); p. 507-509

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AbstractAbstract
No abstract available
Original Title
Diffuse Roentgenstreuung an interstitiell geloestem Sauerstoff in Niob
Source
Spring meeting of the Arbeitskreis Festkoerperphysik of the DPG; Muenster, F.R. Germany; 17 Mar 1975; AED-CONF--75-056-049; Short communication only.
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Journal Article
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Verh. Dtsch. Phys. Ges., Reihe 6; v. 10(5); p. 536
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AbstractAbstract
[en] The effect of oxygen on thermal expansion, elastic moduli, and thermal diffusivity of Zircaloy-4 nuclear reactor fuel cladding was determined for the main purpose of providing baseline data for LOCA evaluation codes. Measurements were made over the temperature range 298 to 1473 K and 0.7 to 28 at.% oxygen. Expansion and moduli were measured in the two relevant directions, while diffusivity was measured in the principal heat transfer direction (through the clad). Thermal expansion and elastic moduli both increased with oxygen, while diffusivity decreased. Similar measurements were made on Zircaloy-2, but only to 5 at.% oxygen. Differences between the two alloys were within experimental error of the measurements made. (orig.)
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Journal Article
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Journal of Nuclear Materials; ISSN 0022-3115;
; v. 116(2/3); p. 219-232

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Klueh, R.L.
Oak Ridge National Lab., Tenn. (USA)1973
Oak Ridge National Lab., Tenn. (USA)1973
AbstractAbstract
No abstract available
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Mar 1973; 27 p
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Report
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AbstractAbstract
[en] The transformation characteristics of rapidly heated (approximately 100-2000C/s) and β-quenched zircaloy-4-0 alloys (0.1-1 wt% 0) have been investigated in detail. Analyses of the heating transients showed that the temperatures Tsub(L) and Tsub(u) for the beginning and end of the α→β transformation was not significantly altered by heating rate in the range of approximately 15-2000C/s. TEM studies revealed entangled dislocations within martensitic α'plates, with the plate boundaries made up of high density dislocations and precipitates. Internal [1011] twinning was observed only for the 0.13 wt% 0 alloy. The Widmanstatten α plates, however, had their plate boundaries delineated by precipitates and low density dislocation walls. The plate interior contained small angle subboundaries and polygonized networks. The plate width W alone was sufficient to characterize the cooling rate. (Auth.)
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Journal Article
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Journal of Nuclear Materials; ISSN 0022-3115;
; v. 79(1); p. 82-94

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AbstractAbstract
[en] In a study of neutron-irradiated Mo containing voids, Schultz et al. [Phys. Rev. Lett. 44, 1629 (1980)] presented data which showed a small fraction of positronium atoms being formed in the voids and decaying by three photons. This effect was observable at temperatures above roughly-equal650 K. It was stated at that time that the positronium may be forming through the same type of high-temperature positron desorption mechanism that had previously been observed for various metallic surfaces with the use of low-energy positron beams. In this Brief Report we show that the temperature at which thermal positronium is activated from a clean Mo(110) surface is 1000 K, which decreases significantly with adsorbed oxygen contamination. These results are consistent with the previous conclusions if the Mo voids were covered with oxygen
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Schneider, Maurice; Moreau, Roland; D'Haenen, J.-P.; Merenda, Pierre.
Compagnie Generale de Radiologie, 75 - Paris (France); Agence Nationale de Valorisation de la Recherche (ANVAR), 92 - Paris-Defense (France)1976
Compagnie Generale de Radiologie, 75 - Paris (France); Agence Nationale de Valorisation de la Recherche (ANVAR), 92 - Paris-Defense (France)1976
AbstractAbstract
[en] A process is described for obtaining oxygen doped zinc telluride monocrystals, for use as scintillator crystals for ionising radiation detectors. The following operations are carried out in succession: one or several zinc telluride crystals are introduced into a silica ampoule together with a ternary mixture of zinc tellurium and oxygen, as an oxide or hydroxide of these elements; the ampoule is pumped down to a high vacuum and sealed; the sealed ampoule containing the mixture and monocrystals is placed in a kiln and brought to a uniform temperature sufficient to make the mixture three-phased, depending on its composition; the zinc telluride crystalline compound remains solid; the ampoule is then tempered to bring it quickly back to ambient temperature
[fr]
On decrit un procede d'obtention de monocristaux de tellurure de zinc dopes a l'oxygene, utilisables comme cristaux scintillateurs pour detecteurs de rayonnements ionisants. On effectue successivement les operations suivantes: dans une ampoule en silice on introduit un ou plusieurs monocristaux de tellurure de zinc, et un melange ternaire de zinc, de tellure et d'oxygene, sous la forme d'un oxyde ou hydroxyde de ces elements; l'ampoule est mise sous un vide pousse a l'aide d'une pompe a vide et scellee; l'ampoule scellee contenant le melange et les monocristaux est introduite dans un four et portee a une temperature homogene et suffisante pour rendre le melange triphase en fonction de la composition de celui-ci, le compose cristallin de tellurure de zinc restant a l'etat solide; l'ampoule est ensuite trempee pour l'amener rapidement a la temperature ambianteOriginal Title
Procede d'obtention de monocristaux de tellurure de zinc dopes a l'oxygene, et cristaux scintillateurs obtenus par ce procede
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20 Feb 1976; 12 p; FR PATENT DOCUMENT 2341360/A/; Available from Institut National de la Propriete Industrielle, Paris (France)
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Patent
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Aleksandrov, V.D.; Egiazarov, B.G.; Polyakova, I.S.; Sel'dyakov, Yu.P.; Chernyavskij, V.T.
Proceedings of the conference on pure metal production and study of their properties1977
Proceedings of the conference on pure metal production and study of their properties1977
AbstractAbstract
[en] The method has been developed for determining oxygen content in molybdenum and tungsten usign the neutron activation analysis. The sensitivity is 1.6X10-5 and 1.3x10-3 wt.% for molybdenum and tungsten, respectively. The density of oxygen distribution in surface layers has been experimentally evaluated. It is shown that the oxygen presence in a surface layer of molybdenum and tungsten does not impede oxygen determination in the bulk of the sample, when the oxygen content is >5x10-5 wt.%. If oxygen content is <2.10-3 wt.%, the presence of oxygen in the surface layer should be taken into account
Original Title
Opredelenie kisloroda v monokristallakh molibdena i vol'frama s uchetom vklada poverkhnostnogo kisloroda
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Source
AN Ukrainskoj SSR, Kharkov. Fiziko-Tekhnicheskij Inst; p. 97-101; 1977; p. 97-101; 6. All-union conference on physical methods of pure metal production and study of their properties; Kharkov, Ukrainian SSR; 1975; 5 refs.; 3 figs.; 2 tables.
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