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The Study of Super-Wideband Optical Amplifier Based on Cr4+:YAG Crystal FiberChuang, Chiang-Yuan 09 July 2004 (has links)
Abstract
During the last decade, the maximum capacity of an optical fiber transmission line more than doubled every year to match the fast-growing communication need. The technology break through in dry fiber fabrication opens the possibility for fiber bandwidth all the way from 1.3
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Microstructures and Dissolution of Cr:YAG Crystal FiberChi, Chun-yu 24 September 2004 (has links)
none
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An Investigation Of Microstructure, Microhardness And Biocompatibility Characteristics Of Yttrium Hydroxyapatite Doped With FluorideToker, Sidika Mine 01 January 2010 (has links) (PDF)
The aim of this study was to investigate the microstructure, microhardness and biocompatibility properties of nano hydroxyapatite (HA) doped with a constant yttrium (Y3+) and varying fluoride (F-) compositions. HA was synthesized via precipitation method and sintered at 1100& / #61616 / C for 1 hour. Increased densities were achieved upon Y3+ doping while F- doping led to a decrease in densities. For structural analysis, XRD, SEM and FTIR spectroscopy examinations were performed. No secondary phases were observed in XRD studies upon doping. Lattice parameters decreased due to substitutions of ions. In SEM analysis, addition of doping ions was observed to result in smaller grains. In FTIR analysis, in addition to the characteristic bands of HA, novel bands indicating the substitution of F- ions were observed in F- ion doped samples. The highest microhardness value was obtained for the sample doped with 2.5%Y3+, 1%F-. Increased F- ion contents resulted in decreased microhardness values.
For biocompatibility evaluation, in vitro tests were applied to the materials. MTT assay was performed for Saos-2 cell proliferation analysis. Y3+ and F- ion incorporation was found to improve cell proliferation on HA discs. Cells were found to attach and proliferate on disc surfaces in SEM analysis. ALP assay showed differentiation of cells on the discs can be improved by doping HA with an optimum amount of F- ion. Dissolution tests in DMEM revealed that structural stability of HA was improved with F- ion incorporation.
The material exhibiting optimum structural, mechanical and biocompatibility properties was HA doped with 2.5%Y3+, 1%F-.
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Experiments on frequency doubling in ferritesBaldwin, Edward Russell, 1938- January 1967 (has links)
No description available.
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Astatine and yttrium resonant ionization laser spectroscopyTeigelhoefer, Andrea 18 September 2012 (has links)
Providing intense, contamination-free beams of rare isotopes to experiments is a challenging task. At isotope separator on-line facilities such as ISAC at TRIUMF, the choice of production target and ion source are key to the successful beam delivery. Due to their element-selectivity, high efficiency and versatility, resonant ionization laser ion sources (RILIS) gain increasingly in importance.
The spectroscopic data available are typically incomplete in the region of excited- and autoionizing atomic states. In order to find the most efficient ionization scheme for a particular element, further spectroscopy is often required. The development of efficient laser resonant ionization schemes for yttrium and astatine is presented in this thesis.
For yttrium, two ionization schemes with comparable relative intensities were found. Since for astatine, only two transitions were known, the focus was to provide data on atomic energy levels using resonance ionization spectroscopy. Altogether 41 previously unknown astatine energy levels were found.
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Development of 66 kV and 275 kV Class REBCO HTS Power CablesHayakawa, N., Ishiyama, A., Amemiya, N., Hasegawa, T., Saitoh, T., Yagi, M., Mukoyama, S., Ashibe, Y., Masuda, T., Okuma, T., Maruyama, O. 06 1900 (has links)
No description available.
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Astatine and yttrium resonant ionization laser spectroscopyTeigelhoefer, Andrea 18 September 2012 (has links)
Providing intense, contamination-free beams of rare isotopes to experiments is a challenging task. At isotope separator on-line facilities such as ISAC at TRIUMF, the choice of production target and ion source are key to the successful beam delivery. Due to their element-selectivity, high efficiency and versatility, resonant ionization laser ion sources (RILIS) gain increasingly in importance.
The spectroscopic data available are typically incomplete in the region of excited- and autoionizing atomic states. In order to find the most efficient ionization scheme for a particular element, further spectroscopy is often required. The development of efficient laser resonant ionization schemes for yttrium and astatine is presented in this thesis.
For yttrium, two ionization schemes with comparable relative intensities were found. Since for astatine, only two transitions were known, the focus was to provide data on atomic energy levels using resonance ionization spectroscopy. Altogether 41 previously unknown astatine energy levels were found.
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Magnetic phase transitions in praseodymium-barium doped manganitesChen, Michael H. January 2007 (has links)
Thesis (M.S.)--University of Texas at El Paso, 2007. / Title from title screen. Vita. CD-ROM. Includes bibliographical references. Also available online.
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Processing and properties of macroporous nanocrystalline yttria stabilised zirconia ceramicsSanta Cruz, Hernán January 2009 (has links)
Zugl.: Bremen, Univ., Diss., 2009
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Selective beta irradiation of the lymphatic system using internally administered Y⁹⁰ DTPA kinetics, dosimetry and biological evaluation /Winchell, Harry S. January 1961 (has links)
Thesis--University of California, Berkeley, 1961. / "UC-48 Biology and Medicine" -t.p. "TID-4500 (16th Ed.)" -t.p. Includes bibliographical references (p. 149-161).
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