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Author : Chuen-Horng Tsai
Publisher :
ISBN 13 :
Total Pages : 388 pages
Book Rating : 4.:/5 (29 download)
Download or read book The Kinetics of Laser Pulse Vaporization of Uranium Dioxide by Mass Spectrometry written by Chuen-Horng Tsai and published by . This book was released on 1981 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Kinetics of Laser-pulse Vaporization of Uranium Dioxide by Mass Spectrometry written by and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Safety analyses of nuclear reactors require knowledge of the evaporation behavior of UO2 at temperatures well above the melting point of 3140 K. In this study, rapid transient heating of a small spot on a UO2 specimen was accomplished by a laser pulse which generates a surface temperature excursion. This in turn vaporizes the target surface and the gas expands into vacuum. The surface temperature transient was monitored by a fast-response automatic optical pyrometer. A computer program was developed to simulate the laser heating process and calculate the surface temperature evolution. A quadrupole mass spectrometer was used to identify and analyze the major vapor species in the vaporizing flow, and to measure the rate of evaporation from the target surface. The information yielded the partial vapor pressure of each species and the composition in the vapor jet. The maximum surface temperatures investigated range from approx. 3700 K to approx. 4300 K.
Author : Fatollah Tehranian
Publisher :
ISBN 13 :
Total Pages : 414 pages
Book Rating : 4.:/5 (29 download)
Download or read book The Kinetics of Laser Pulse Vaporization of Uranium Carbide by Mass Spectrometry written by Fatollah Tehranian and published by . This book was released on 1983 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Download or read book Kinetics of Laser-pulse Vaporization of Uranium Carbide by Mass Spectrometry. [LMFBR]. written by and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The kinetics of uranium carbide vaporization in the temperature range 3000 K to 5200 K was studied using a Nd-glass laser with peak power densities from 1.6 x 105 to 4.0 x 105 watts/cm2. The vapor species U, UC2, C1 and C3 were detected and analyzed by a quadrupole mass spectrometer. From the mass spectrometer signals number densities of the various species in the ionizer were obtained as functions of time. The surface of the irradiated uranium carbide was examined by scanning electron microscope and the depth profile of the crater was obtained. In order to aid analysis of the data, the heat conduction and species diffusion equations for the solid (or liquid) were solved numerically by a computer code to obtain the temperature and composition transients during laser heating. A sensitivity analysis was used to study the effect of uncertainties in the input parameters on the computed surface temperatures.
Author : Rachel Pflieger
Publisher :
ISBN 13 :
Total Pages : 188 pages
Book Rating : 4.:/5 (493 download)
Download or read book Mass Spectrometric Study of the Laser Vaporisations of Graphite and Uranium Dioxide Up to 4000k written by Rachel Pflieger and published by . This book was released on 2006 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new method of high-temperature mass spectrometry (TOF MS) was developed, where the specimen surface is heated by a laser pulse of approx. 20 ms. During it, time-resolved measurements of mass spectra and of the temperature are performed. Each experiment covers an entire temperature interval. The method was applied to pyrolytic graphite and uranium dioxide.In graphite study, it was clearly shown that the sublimation occurs in a Langmuir-like mode (free surface vaporisation), despite the very high temperatures and thus pressures. Relative partial pressures of C1, C2, C3, C4 and C5 were measured up to 4100 K. Obtained sublimation enthalpies of the main three vapour species are in a good agreement with literature values. Relative vaporisation coefficients of C1-C5 were estimated by comparison of the present partial pressures at 4000 K with equilibrium ones given in the literature.The vapour pressure curve of UO2 over stoichiometric uranium dioxide was measured between 2800 and 3400 K. Obtained sublimation and vaporisation enthalpies are in agreement with the literature. The vaporisation enthalpy of UO3 was measured for the first time. Relative partial pressure ratios p(UO2)/p(UO), p(UO2)/p(UO3) and p(UO2+)/p(UO+) were measured at around 3300 K and indicate that the vaporisation occurs in a regime close to thermodynamic equilibrium.This method is suitable for the fast and time-resolved mass spectrometric measurements of refractory materials up to very high temperatures, and could now be applied to the study of chemically unstable materials such as hyperstoichiometric urania and some carbides and nitrides.Key words: pyrolytic graphite, HOPG, uranium dioxide, laser vaporisation, TOF MS, vaporisation coefficients, Langmuir evaporation.
Author : Zuhair A. Munir
Publisher :
ISBN 13 :
Total Pages : 684 pages
Book Rating : 4.:/5 (8 download)
Download or read book Proceedings of the Symposium on High Temperature Materials Chemistry--IV written by Zuhair A. Munir and published by . This book was released on 1988 with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 760 pages
Book Rating : 4.:/5 (3 download)
Download or read book Energy Research Abstracts written by and published by . This book was released on 1983 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 764 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1983 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
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ISBN 13 :
Total Pages : 320 pages
Book Rating : 4.3/5 (243 download)
Download or read book Bibliography on the High Temperature Chemistry and Physics of Materials written by and published by . This book was released on 1989 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Roland Allred
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ISBN 13 :
Total Pages : 120 pages
Book Rating : 4.:/5 (29 download)
Download or read book Determination of Laser-evaporated Uranium Dioxide by Neutron Activation Analysis written by Roland Allred and published by . This book was released on 1987 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 1178 pages
Book Rating : 4.:/5 (89 download)
Download or read book Government Reports Annual Index written by and published by . This book was released on 1983 with total page 1178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Suresh Kumar Yagnik
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ISBN 13 :
Total Pages : 84 pages
Book Rating : 4.:/5 (397 download)
Download or read book Laser-induced Vaporization of Uranium Dioxide written by Suresh Kumar Yagnik and published by . This book was released on 1987 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 406 pages
Book Rating : 4.3/5 (91 download)
Download or read book 國立清華大學教職員著作目錄 written by and published by . This book was released on 1983 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : American Nuclear Society
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ISBN 13 :
Total Pages : 776 pages
Book Rating : 4.2/5 (949 download)
Download or read book Transactions of the American Nuclear Society written by American Nuclear Society and published by . This book was released on 1983 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 1430 pages
Book Rating : 4.F/5 ( download)
Download or read book INIS Atomindex written by and published by . This book was released on 1984 with total page 1430 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 1032 pages
Book Rating : 4.:/5 (3 download)
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1983-04 with total page 1032 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 888 pages
Book Rating : 4.F/5 ( download)
Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1984 with total page 888 pages. Available in PDF, EPUB and Kindle. Book excerpt:
