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  • 1995-1999  (3)
  • 1990-1994  (3)
  • Chemistry  (3)
  • 78.55.Cr  (1)
  • 78.55−m  (1)
  • Automated percutaneous discectomy  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Photoluminescence study of manganese in AlSb (1993)
    Springer
    Applied physics 57 (1993), S. 315-317 
    Details
    ISSN: 1432-0630
    Keywords: 78.55.Cr ; 71.55.Eq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We have investigated Czochralski-grown manganese-doped AlSb by low-temperature photoluminescence spectroscopy. Discrete donor-acceptor pair lines are resolved, which involve the Mn acceptor. A Mn acceptor binding energy (E A =92±5 meV) is deduced from the donor-acceptor pair luminescence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332283
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    New growth technique for luminescent layers on silicon (1992)
    Springer
    Applied physics 54 (1992), S. 567-569 
    Details
    ISSN: 1432-0630
    Keywords: 68.55−a ; 68.65+g ; 78.55−m
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We report the growth of siloxene on crystalline silicon (111) surfaces based on the chemical transformation of a calcium disilicide layer. The siloxene films obtained show a prominent luminescence in the green, with intensities comparable to the luminescence observed from porous silicon. The structural properties of the siloxene films are studied with infrared transmission and TEM micrographs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324341
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Automated percutaneous lumbar discectomy (APLD) — Method and 1-Year follow-up (1992)
    Springer
    European radiology 2 (1992), S. 292-298 
    Details
    ISSN: 1432-1084
    Keywords: Spine surgery ; Automated percutaneous discectomy ; Lumbar disc herniation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract From July 1989 to June 1991 135 discs on 129 patients were treated, in about twothirds at level L4/5 and at the remaining one third L5/S1.15% (n = 2) failed technically. Sixty eight patients are in the 1-year follow-up. Average age was 41 years (range 16–68 years). Average pain duration was 12 months, and average aspiration time was 25.8 min (range 15–45 min). All patients had contained disc lesions, suffered from radicular symptoms and had not responded to conservative treatment. 67,1% (group A, n =45) had a failure rate of 17,8%. Patients with associated degenerations (group B, n = 7) had a failure rate of 35,3%. 80% of the patients with recurrent radicular symptoms (group C, interval patients, n = 6) were free of symptoms. Re herniation rate in all patients was 2.9%, and the laminectomy rate 4.4%. No major complications were noted. Treated disc level, patient aage, aspirated nucleus material and CT changes revealed no correlation to clinical success. Patients with associated degenerations (group B) as wellas those with longer pain duration and larger contained disc lesions had a significantly worse outcome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00175429
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    83. Modellierung der Fließeigenschaften von Suspensionen in Abhängigkeit von Feststoffvolumenkonzentration, Partikelgröße und Partikelform (1999)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 71 (1999), S. 994-994 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330710987
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  • 5
    Electronic Resource
    Electronic Resource
    Density functional investigation of the mechanism of the selective catalytic reduction of NO by NH3 over vanadium oxide model clusters (1997)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 61 (1997), S. 683-688 
    Details
    ISSN: 0020-7608
    Keywords: Chemistry ; Theoretical, Physical and Computational Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Quantum chemical calculations using the density functional theory were performed to model the mechanism of selective catalytic reduction of NO by NH3 on a supported vanadium oxide monolayer. In the first step, the adsorption of NH3 on a bimetallic cluster representative of vanadium oxide, containing a terminal V—O adjacent to a V—OH group, was investigated. The calculations indicate that NH3 may be strongly adsorbed on V=OH (Brönsted acid site) as NH+4(ads); subsequently, NO reacts with this activated NH3 to yield the reaction products N2 and H2O. The present results give support to a dual-site Eley-Rideal-type mechanism involving a Brönsted site. © 1997 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 6
    Electronic Resource
    Electronic Resource
    Interactions of Tin(IV) and monomethyltin cation in estuarine water-sediment slurries from the great bay estuary, New Hampshire, USA (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 9 (1995), S. 581-590 
    Details
    ISSN: 0268-2605
    Keywords: inorganic tin ; monomethyltin cation ; model studies ; salt marsh ; sediment ; Spartina alterniflora ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This study describes experiments on sedimentestuarine water slurries originating from a Spartina alterniflora salt marsh. We investigated the fate of tin(IV) or monomethyltin cation (MeSn3+) chlorides after their additon to slurries under anaerobic and aerobic conditions. We did not observe methylation of tin in anaerobic or aerobic slurries with and without added tin(IV). MeSn3+-amended samples occasionally formed small amounts of Me2Sn2+ or Me3Sn+ after extended periods of time, particularly when MeSn3+ remained in solution. The stability of MeSn3+ in slurries demonstrates that the absence of net methylation of tin(IV) is not due to rapid demethylation of MeSn3+ or its further methylation. Inorganic tin concentrations in the aqueous phase of anaerobic slurries spiked with MeSn3+ and unspiked slurries decreased by about 85% in 21 days and remained relatively constant until the end of the 59-day experiments. In similar anaerobic experiments about 25% of the MeSn3+ spike was adsorbed to sediment within 1 h and about 75% was adsorbed within 10 days. The lack of methylation and demethylation reactions in our aerobic and anaerobic slurries, which contrasts with two previous reports, undoubtedly reflects the absence of added nutrients and low concentrations of added tin(IV) in our experiments. We believe that our model experiments more accurately reflect conditions in salt marshes than do previous studies. We conclude that future model studies on methylation of inorganic tin should include. S. alterniflora because it is so prominent in observations of methyltin compounds in the estuary.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590090713
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