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  • 1
    Electronic Resource
    Electronic Resource
    Composition Dependent Resonant Raman Scattering in Al〈sub〉0.33〈/sub〉Ga〈sub〉0.67〈/sub〉As/In〈sub〉x〈/sub〉Ga〈sub〉1-x〈/sub〉As〈sub〉1-y〈/sub〉N〈sub〉y〈/sub〉 Multiquantum Wells (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 518 (July 2006), p. 17-22 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: InxGa1-xAs1-yNy/Al0.33Ga0.67As multiquantum wells grown by plasma-assisted molecularbeam epitaxy are studied by resonant inelastic light scattering. Sharp vibration modes have beenobserved at 323, 402, 454 and 501 cm-1. Their intensities resonate at the barrier bandgap reduced bythe presence of N. Their resonance energies reveal the influence of the N concentration on thebarrier gap at the multiquantum well interfaces. These peaks are interpreted in terms of localvibrations involving the pairing of N atoms, which seems to occur mostly at the quantum wellinterfaces due to preferential bonding of N to Al
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.518.17.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Resonant Raman Scattering in Strained and Relaxed In〈sub〉x〈/sub〉Ga〈sub〉1-x〈/sub〉N/GaN Multiple Quantum Wells (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 494 (Sept. 2005), p. 19-24 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: We present resonant Raman scattering measurements on strained and relaxedInxGa1-xN/GaN multiple quantum wells. The pseudomorphic sample does not show significant deviation of the A1(LO) phonon frequency with respect to GaN value due to a strong compensation of composition and strain effects which makes the frequency of this mode almost independent on In concentration. In contrast, the relaxed sample shows a marked decrease of the Raman frequency. Raman spectra excited in the energy range of sample emission have been recorded at roomtemperature. The resonant conditions have been attained using tuneable lasers in the blue-green spectral region. Resonant profiles are significantly blue-shifted with respect to the photoluminescence emission as a result of an inhomogeneous In distribution. In relaxed multiple quantum well, the Raman shift of the A1(LO) mode and the maximum of the resonant Raman profile give a direct estimate of the In concentration and its variation range
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.494.19.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Ion exchange of strontium on synthetic hydroxyapatite (1991)
    Springer
    Journal of radioanalytical and nuclear chemistry 149 (1991), S. 161-168 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Adsorption of strontium ions on synthetic hydroxyapatite was examined using both batch and column methods. The apatite was prepared from aqueous solutions and characterized by standard analytical methods. The sample obtained had characteristics of well crystallized stoichiometric hydroxyapatite. The experimental data for sorption of strontium can be very well fitted with Langmuir's adsorption isotherm. It was found that sorption occurs by an ion exchange reaction between strontium ions in solution and calcium ions in apatite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02053724
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  • 4
    Electronic Resource
    Electronic Resource
    Sorption of hypoiodous acid on activated carbon (1996)
    Springer
    Journal of radioanalytical and nuclear chemistry 208 (1996), S. 453-460 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract In spite of good adsorption characteristics of activated carbon for molecular iodine, from water solution, problems arising due to complexity of chemistry of iodine and hydrolysis as well as influences of other relevant factors in water solutions which easily change the equilibrium concentrations toward domination of species with lower absorbability. Sorption of hypoiodus acid as predominant chemical form of iodine in neutral and weak alkaline solution within the range of micro concentrations has been studied in great details. In the experiments sorption of hypoiodous acid from water solutions on activated carbon with surface area of 1000 m2/g, under static and dynamic conditions, has been performed. Isotherms on various temperatures (25°C, 50°C, 70°C) has been obtained. Parameters of the sorption are determined and mechanism of adsorption of hypoiodous acid molecules on activated carbon has been discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02040062
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  • 5
    Electronic Resource
    Electronic Resource
    The effect of morphological changes on the coprecipitation of strontium by calcium phosphate (1995)
    Springer
    Journal of radioanalytical and nuclear chemistry 198 (1995), S. 303-309 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The coprecipitation of strontium by a calcium phosphate phase formed at an elevated pH 10.8 was investigated. The first phase obtained under these conditions in the amorphous calcium phosphate (ACP) which is transformed into crystalline hydroxyapatite (HA) after the induction period. Is has been shown that this transformation together with morphological changes of the precipitated solid phase, influences the amount of the sorbed strontium significantly. The possible consequences of this finding on practical application of coprecipitation of strontium by calcium phosphate have been discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02036545
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