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  • 1
    Electronic Resource
    Electronic Resource
    Self-Diffusion of Neon in Water by 21Ne NMR (1994)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 116 (1994), S. 801-802 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00081a064
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  • 2
    Electronic Resource
    Electronic Resource
    Study of Boron Incorporation During PVT Growth of p-type SiC Crystals (2001)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 353-356 (Jan. 2001), p. 49-52 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/05/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.353-356.49.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Stability Criteria for 4H-SiC Bulk Growth (2001)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 353-356 (Jan. 2001), p. 25-28 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/05/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.353-356.25.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Der Wert der BCG-Impfung der Neugeborenen im Rahmen eines umfassenden Tuberkulosebekämpfungsprogrammes (1968)
    Springer
    Lung 137 (1968), S. 158-167 
    Details
    ISSN: 1432-1750
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02097649
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  • 5
    Electronic Resource
    Electronic Resource
    Interlaboratory comparison study for the determination of the Fusarium mycotoxins deoxynivalenol in wheat and zearalenone in maize using different methods (1997)
    Springer
    Fresenius' journal of analytical chemistry 359 (1997), S. 510-515 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Seventeen laboratories from six different countries, using their usual in-house methods, participated in an interlaboratory comparison test for the determination of the Fusarium mycotoxins deoxynivalenol (DON) in wheat and zearalenone (ZON) in maize. The toxins generally were extracted from maize and wheat employing mixtures of water, acidified water with an organic solvent or even pure water (for DON). While participants who used enzyme linked immuno sorbent assays (ELISA) for the determination of DON did not perform any clean-up, various techniques were applied for the purification of raw extracts (e.g. liquid/liquid extraction, solid phase extraction (SPE), immuno affinity chromatography (IAC)). For the final separation/quantification step either high performance liquid chromatography (HPLC) (mostly for ZON), gas chromatography (GC) (for DON) or ELISA were employed by participants. The aim of this study was to obtain information about the state of the art of mycotoxin analysis in cereals and to support a knowledge and experience exchange between the participating laboratories in the field of mycotoxin analysis. For each mycotoxin 5 different sample types were distributed, standard solutions (10.10 μg/ml ZON in methanol, 10.09 μg/ml DON in ethyl acetate), blank materials, spiked samples (75.1 μg/kg and 378.3 μg/kg ZON in maize, 126.2 μg/kg and 2519 μg/kg DON in wheat) and naturally contaminated maize and wheat. Coefficients of variation (CV) between laboratory mean results (outliers excluded) ranged from 6.2 to 27.7% for ZON and from 18.9 to 30.0% for DON. Except for the maize samples spiked at 75.1 μg/kg ZON the overall means (outliers rejected) statistically could not be distinguished from the respective target values. Average recoveries of the reported results ranged from 87.7 to 96.2% for ZON and from 94.2 to 108.5% for DON.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050622
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  • 6
    Electronic Resource
    Electronic Resource
    Interaktive Visualisierung und Simulation zur Planung chirurgischer Eingriffe (1999)
    Springer
    Informatik, Forschung und Entwicklung 14 (1999), S. 9-15 
    Details
    ISSN: 0949-2925
    Keywords: Schlüsselwörter:Hybride Volumenvisualisierung, Parallelisierung, Plugin-Konzept, Gewebemodellierung, Simulation, Medizinische Operationsplanung ; Key words: Hybrid volume visualization, parallisation, plug-in concept, tissue modelling, simulation, surgery planning ; CR Subject Classification: D.1, D.2.11, I.3.3, I.3.7, I.4.9
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Abstract. This paper describes recent approaches for visualizing and analysing medical volume data. The methods' objective is to establish a preoperative surgery planning. It is shown, that volume data can be interactively visualized. Moreover, the behaviour of tissue and functional units can be simulated. Tools for interactive volume visualization have been embedded into a radiological workstation. A hybrid approach to visualization integrates the display of surface- and voxel-based objects. Employing a client/server architecture, central and powerful resources can be used to perform volume visualization and image analysis tasks.
    Notes: Zusammenfassung. Der vorliegende Artikel beschreibt aktuelle Ansätze zur Visualisierung und weiteren Bearbeitung medizinischer Volumendaten. Die Methodik verfolgt das Ziel, die präoperative Planung chirurgischer Eingriffe zu unterstützen, in dem Volumendaten interaktiv visualisiert und Gewebe wie auch funktionelle Einheiten simuliert werden. Eingebettet in ein Radiologiesystem kann der Benutzer mit den Visualisierungen im dreidimensionalen Raum interagieren. Ein hybrider Ansatz erlaubt die Integration von oberflächen- und volumenorientierten Objektmodellen. Die Client/Server Architektur erlaubt die Nutzung zentraler, leistungsfähiger Ressourcen zur Berechnung der Volumenvisualisierung und Methoden der Bildverarbeitung.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004500050119
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  • 7
    Electronic Resource
    Electronic Resource
    Cathodoluminescence Measurements and Thermal Activation of Rare Earth Doped (Tb〈sup〉3+〈/sup〉, Dy〈sup〉3+〈/sup〉 and Eu〈sup〉3+〈/sup〉) a-SiC Thin Films Prepared by rf Magnetron Sputtering (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 527-529 (Oct. 2006), p. 663-666 
    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 comprehensive cathodoluminescence measurements from thin amorphous a-SiC films doped with rare earths. The a-SiC films were prepared by rf magnetron sputtering using ahigh purity SiC wafer in high purity argon atmosphere (5N, pressure approx. 0.2 mbar). The rareearth doping (Tb, Dy and Eu concentrations were below 2%) was performed by placing respectiverare earth metal pieces of appropriate size onto the Silicon Carbide wafer. The rare earth ionemissions cover the colors green (Tb), yellow (Dy) and red (Eu). The optical and related structuralproperties of the films are correlated by means of high resolution transmission electron microscopyin combination with cathodoluminescence measurements in a scanning electron microscope. Inaddition, the corresponding compositions are determined by energy-dispersive x-ray analysis. Thecathodoluminescence spectra of the rare earth 3+ ions are recorded in the visible at 20°C in the asgrowncondition and after annealing treatments in the temperature range from 300°C to 1050°C bysteps of 150°C. The anneal-related changes in the cathodoluminescence emission spectra and in themicrostructure of the films are addressed. The SiC films show amorphous structure almostindependent of the annealing treatment. Optimal annealing temperature for emissions of Tb3+ dopeda-SiC were derived to be 600°C whereas Dy3+ and Eu3+ emissions increase at least up to 1050°C
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.527-529.663.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    The effect of site-specific isotopic substitutions on transport coefficients of liquid methanol (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 2568-2574 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A new approach is suggested for studying the nature of molecular transport in simple liquids, which makes use of site-specific isotopic substitutions. Its application represents the first systematic experimental study of a theoretically predicted correlation between transport coefficients in liquids and molecular moments of inertia. For this purpose, we have determined the viscosities and self-diffusion coefficients at 25 °C of normal methanol and seven isotopically labeled methanol species: CH3OD, CD3OH, CD3OD, CH2DOH, CHD2OH, CHD2OD, and 13CH3OH. Except for 12C/13C substitution, the observed isotope effects are significantly larger than predicted by a square root of mass dependence, but are well correlated with the square roots of the moments of inertia. The results give strong evidence that translation–rotation coupling influences the transport processes in methanol, thus confirming earlier interpretations of isotope effects upon the transport in water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457016
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  • 9
    Electronic Resource
    Electronic Resource
    Anisotropic molecular reorientation of liquid benzene revisited. A study using 13C magnetic relaxation through chemical shift anisotropy and spin rotation (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 3361-3365 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report on 13C magnetic relaxation in liquid benzene (C6H6 and C6D6) at 293 K at resonance frequencies of 22.63 and 100.6 MHz. The total spin–lattice relaxation rates are separated into contributions from 13C–1H and 13C–2D dipolar, spin–rotation (SR), and chemical shift anisotropy (CSA) interactions. As the principal axis of the 13C chemical shift tensor is collinear with the sixfold axis of benzene, CSA relaxation provides information on the tumbling motion of benzene, hitherto not available from other NMR experiments. The resulting correlation time τ⊥ = 1.63 ps at 20 °C indicates a faster tumbling motion, and hence, a smaller anisotropy of benzene reorientation than usually quoted in the literature. This result is qualitatively confirmed by an analysis of 13C relaxation by SR interaction, and is in fair agreement with recent results obtained in Raman line shape measurements. It is, however, at variance with the figures deduced from Rayleigh scattering experiments. The activation energy for the tumbling motion is found to be 9.8 kJ mol−1, which is markedly larger than the activation energy of 7.7 kJ mol−1 obtained from 2D relaxation data for the motion of in-plane axes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459759
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  • 10
    Electronic Resource
    Electronic Resource
    Dielectric spectroscopy in aqueous solutions of oligosaccharides: Experiment meets simulation (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 1463-1472 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report the frequency-dependent complex dielectric permittivity of aqueous solutions of the homologous saccharides D(+)-glucose, maltose, and maltotriose in the frequency range 200 MHz≤ν≤20 GHz. For each solute, solutions having concentrations between 0.01 and 1 mol dm−3 were studied. In all measured spectra two dispersion/loss regions could be discerned. With the exception of the two most concentrated maltotriose solutions, a good description of the spectra by the superposition of two Debye processes was possible. The amplitudes and correlation times of the glucose and maltose solutions determined from fits of the experimental data were compared to those obtained in an earlier molecular dynamics study of such systems; the overall agreement between experiment and simulation is quite satisfactory. A dielectric component analysis of the simulation results permitted a more detailed assignment of the relaxation processes occurring on the molecular level. The physical picture emerging from this analysis is compared with traditional hydration models used in the interpretation of measured dielectric data. It is shown that the usual standard models do not capture an important contribution arising from cross terms due to dipolar interactions between solute and water, as well as between hydration water and bulk water. This finding suggests that conventional approaches to determine molecular dipole moments of the solutes may be problematic. This is certainly the case for solutes with small molecular dipole moments, but strong solute–solvent interactions, such as the saccharides studied here. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1380205
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