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AbstractAbstract
No abstract available
Original Title
Betrachtungen ueber das thermochemische Verhalten von Zirkon
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17 refs.; 14 tabs.; 3 figs.
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Journal Article
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Progress Report
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Ber. Deut. Keram. Ges; v. 48(2); p. 60-66
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AbstractAbstract
No abstract available
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Journal Article
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Progress Report
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Phys. Rev., B; v. 2 p. 4988-4994
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AbstractAbstract
No abstract available
Original Title
Vliyanie MoO3 na poverkhnostnye svojstva rasplavlennykh silikatov
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Journal Article
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Progress Report
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Zhurnal Prikladnoj Khimii; v. 44(5); p. 1033-1036
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[en] A smoky colour can be induced in rock crystal by irradiation techniques. The article investigates the cause of the smoky colour in quartz by irradiating the clear variety. The various theories which have been applied to explain the colouration phenomenon of smoky quartz are reviewed
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Journal Article
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Australian Gemmologist; ISSN 0004-9174;
; v. 13(12); p. 373-378

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AbstractAbstract
[en] The introduction of equilibrated amounts of oxygen isotopes into an alpha quartz crystal was demonstrated after growing it in a hydrothermal solution made from water enriched in 18O and 17O isotopes. (Auth.)
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Journal Article
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Journal of Crystal Growth; v. 36(2); p. 345-346
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Ney, R.J.; Hafner, E.
General Electric Co., St. Petersburg, FL (USA). Neutron Devices Dept.; Army Electronics Technology and Devices Lab., Fort Monmouth, NJ (USA)1979
General Electric Co., St. Petersburg, FL (USA). Neutron Devices Dept.; Army Electronics Technology and Devices Lab., Fort Monmouth, NJ (USA)1979
AbstractAbstract
[en] An ultrahigh vacuum continuous cycle quartz crystal fabrication facility has been developed that assures an essentially contamination-free environment throughout the final manufacturing steps of the crystal unit. The system consists of five essentially tubular vacuum chambers that are interconnected through gate valves. The unplated crystal resonators, mounted in ceramic flatback frames and loaded on carrier trays, enter the vacuum system through an entrance air lock, are UV/ozone cleaned, baked at 3000C, plated to frequency, thermocompression sealed, and exit as completed crystal units through an exit air lock, while the bake, plate and seal chambers remain under continuous vacuum permanently. In-line conveyor belts are used, in conjunction with balanced vacuum manipulators, to move the resonator components to the various work stations. Unique high density, highly directional nozzle beam evaporation sources, capable of long term operation without reloading, are used for electroding the resonators simultaneously on both sides. The design goal for the system is a production rate of 200 units per 8 hour day; it is adaptable to automatic operation
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Source
1979; 6 p; 33. annual symposium on frequency control; Atlantic City, NJ, USA; 30 May - 1 Jun 1979; CONF-790554--2; Available from NTIS., PC A02/MF A01
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Report
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Conference
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Hellwarth, R.; Cherlow, J.; Yang, T.T.
California Univ., Livermore (USA). Lawrence Livermore Lab.; University of Southern California, Los Angeles (USA). Electronic Sciences Lab1974
California Univ., Livermore (USA). Lawrence Livermore Lab.; University of Southern California, Los Angeles (USA). Electronic Sciences Lab1974
AbstractAbstract
No abstract available
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Source
1974; 24 p
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Report
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AbstractAbstract
[en] The TL properties of fused silica are examined for gamma-ray dosimetry. The TL response of fused silica to gamma rays is compared with glass plate. The sensitization effect of fused silica was studied as a function of post irradiation temperature and pre-annealing exposure. UV effect on preexposed fused silica samples was also examined. The experimental results indicate the usefulness of fused silica as a gamma-ray dosimeter over a wide dose range from below 100 mR to 0.1 MR. (orig.)
[de]
Es werden die TL-Eigenschaften von Quarzglas hinsichtlich Gamma-Dosimetrie untersucht. Die TL-Antwort von Quarzglas auf Gammastrahlung wird mit der von gewoehnlichen Glasplaettchen verglichen. Der Sensitivierungseffekt von Quarzglas wird in Abhaengigkeit von der Temperatur nach der Bestrahlung und der Exposition vor dem Ausheizen untersucht. Es zeigt sich, dass das TL-Signal von der Exposition nach der Bestrahlung abhaengt. Der Einfluss von UV-Einstrahlung auf bereits exponierte Quarzglasproben wurde ebenfalls untersucht. Die experimentellen Ergebnisse lassen Quarzglas als Gamma-Dosimeter in einem weiten Dosisbereich von weniger als 100 mR bis zu 0,1 MR erscheinen. (orig.)Source
4 figs.; 4 tabs.; 5 refs.
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Journal Article
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Atomkernenergie; v. 28(2); p. 135-137
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[en] The origin of mineralisation in tectonic vein systems and pressure shadows is investigated using oxygen isotope analysis to evaluate equilibrium between the rock matrix and secondary minerals. The delta18O of vein quartz is controlled by that of detrital quartz in the country rock. It is concluded that ein systems in rocks deformed under conditions of low grade metamorphism form principally by local diffusional mass transport. The abundance of veining under these conditions coincides with the low-temperature deformation regime dominated by pressure solution processes, and it is not necessary to appeal to hydrothermal transport in solution. However, coexisting minerals in country rock and veins display isotopic disquilibrium. Examination of primary fluid inclusions in vein quartz reveals that the fluids are high density, subcritical aqueous chloride solutions with a small component of CO2. The delta18O vales of fluids calculated to be in equilibrium with vein quartz fall between 4 promille and 10 promille, consistent with the accepted range of isotopic compositions of fluids implicated in diagenesis and metamorphism. From several lines of evidence it is suggested that the water/rock ratio during deformation and veining is low. (orig./HK) 891 HK
[de]
Es wird der Ursprung der Mineralisation in tektonischen Gangsystemen und in Druckschattenbereichen mit Hilfe der Sauerstoffisotopenanalyse untersucht, um Einblick in das Gleichgewicht zwischen der Gesteinsmatrix und dem Sekundaermineral zu erhalten. Der delta18O des Gangquarz wird durch den klastischen Quarz im Nebengestein kontrolliert. Aus den Ergebnissen wird geschlossen, dass Gangsysteme in Gesteinen, deren Verformung unter den Bedingungen eines geringen Metamorphismus vor sich geht, vor allem durch lokalen, diffusionsantigen Massentransport entstehen. Die Haeufigkeit der Gangbildung unter diesen Bedingungen passt zu der Verformungsart bei niedrigen Temperaturen durch Loesungsprozesse unter Druck, und es esteht keinerlei Notwendigkeit, auf den Hydrothermaltransport in der Loesung zu verweisen. Nebeneinander bestehende Mineralien in Nebengestein und Gaengen zeigen isotopisches Ungleichgewicht. Die Untersuchung von Primaerfluideinfluessen im Gangquarz zeigt, dass die Fluide hochdichte, subkritische waessrige Chloridloesungen sind mit geringem Anteil von CO2. Die delta18O-Werte von Fluiden, die nach den Berechnungen im Gleichgewicht mit dem Gangquarz sind, liegen zwischen 4 promille und 10 promill, was uebereinstimmt mit dem akzeptierten Bereich von Isotopenzusammensetzungen von Fluiden, die beim Metamorphismus und bei der Diagenese beteiligt sind. Es wird dabei angenommen, dass das Verhaeltnis Wasser/Gestein waehrend der Verformung und Gangbildung niedrig ist. (orig./HK)Primary Subject
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Neues Jahrbuch fuer Mineralogie, Abhandlungen; v. 131(3); p. 225-239
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AbstractAbstract
No abstract available
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Journal Article
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IEEE (Inst. Elec. Electron. Eng.), J. Quant. Electron; v. QE-9(5); p. 546-548
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