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  • 1995-1999  (73)
  • 1990-1994  (36)
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  • 1
    Electronic Resource
    Electronic Resource
    X-ray imaging of polycrystalline materialsa) (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 3560-3562 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A novel method yielding simultaneous information about location and orientation of the crystallites in a polycrystalline specimen has been developed and succesfully applied to the investigation of thin diamond films deposited on silicon. The experiment uses the parallel beam from a synchrotron radiation source and a microchannel plate as collimator in front of an image plate detector. Exposure times of only a few minutes could be realized. The spatial resolution was 0.375 mm but can easily be improved. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145469
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  • 2
    Electronic Resource
    Electronic Resource
    A sublimation probe for the injection of high-Z impurities into fusion devices (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 63-67 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: For the investigation of high-Z impurities in the ASDEX Upgrade tokamak a sublimation probe was developed and tested. With this probe it is possible to inject materials, that sublimate at temperatures from about 50 to 150 °C into the plasma through a controllable valve. For the investigation of the tungsten transport in ASDEX Upgrade the probe was operated with tungsten carbonyl. The flux of tungsten, which is difficult to determine directly because of the uncertain atomic data, can be determined using the fluxes of oxygen and carbon, the atomic data of which are better known. In this article the setup of the probe and first experiments are described. Here the layer of deposited tungsten was investigated and the number of emitted photons per ionization (the S/XB ratio) for the 400.8 nm line of W I was estimated. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149575
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  • 3
    Electronic Resource
    Electronic Resource
    Kinetics and mechanisms of ligand-substitution reactions at tetrahedral bis(diimine)copper(I) complexes in acetone and methanol (1992)
    s.l. : American Chemical Society
    Inorganic chemistry 31 (1992), S. 187-190 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00028a012
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  • 4
    Electronic Resource
    Electronic Resource
    Texture analysis of chemical vapor deposited diamond films on silicon by the component method (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 4765-4770 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Oriented diamond films have been grown on Si(001) and Si(111) substrates by microwave plasma chemical vapor deposition. X-ray diffractometry has been employed for pole figure measurements which have been evaluated by the component method. This technique can be applied to multiphase materials with overlapping pole figures. It decomposes the texture into components by identifying preferred directions in the pole density distribution. Thereby the textures of both diamond on Si(001) and on Si(111) have been reproduced quantitatively elucidating the heteroepitaxial orientational relationship and the occurrence of twinning. The volume fractions of both epitaxially oriented diamond crystallites and their twins of first order have been determined. It is shown that under the employed nucleation and growth conditions twinning is more pronounced for diamond on Si(111) than on Si(001). Furthermore, the fraction of randomly oriented crystallites in both textures has been determined. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359412
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  • 5
    Electronic Resource
    Electronic Resource
    Study of the initial growth phase of chemical vapor deposited diamond on silicon(001) by synchrotron radiation (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 1907-1910 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Very thin diamond films (thickness ∼0.1 μm) have been investigated by x-ray diffraction pole figure measurements using synchrotron radiation in order to understand the mechanism of heteroepitaxial diamond nucleation and the first steps of film growth on silicon(001) substrates. The diamond layers consist of an epitaxially aligned component with a crystallographic orientation identical to the substrate. The initial orientational spread of the grains around the perfect epitaxial orientation prior to any modification by a subsequent textured growth step has been determined. In the studied temperature range for the nucleation step the misalignment decreases slightly with increasing temperature. Besides the epitaxial crystallites their corresponding twins of first and second order have been found. The intensity distribution of the pole figures indicates that the process of twinning plays a dominating role in the initial growth stage which shows a tendency to become even more pronounced for higher substrate temperatures. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361080
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  • 6
    Electronic Resource
    Electronic Resource
    Characterization of the near-interface region of chemical vapor deposited diamond films on silicon by backscatter Kikuchi diffraction (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 1781-1783 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The lattice orientations near the interface of chemical vapor deposited diamond films on Si(001) have been studied by orientation imaging microscopy. This technique is based on the automated analysis of electron backscatter Kikuchi diffraction patterns. The electron beam has been scanned in discrete steps over the reverse side of the diamond film after having removed the substrate. The obtained data have allowed us to determine the texture and to visualize quantitatively the orientational arrangement of and among individual diamond crystallites in the near-interface region. A comparison with the orientation of the substrate has proved the existence of epitaxially nucleated grains. A high amount of twinned diamond has been deduced from the pole figures and verified by analysis of orientation correlations between neighboring crystallites. Moreover, the grain boundary maps have allowed us to monitor and quantify directly the occurring twin boundaries. © 1994 American Institue of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112867
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  • 7
    Electronic Resource
    Electronic Resource
    Lewis-base-catalyzed diimine-ligand-substitution reactions at copper(I) (1992)
    s.l. : American Chemical Society
    Inorganic chemistry 31 (1992), S. 3132-3137 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00040a025
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  • 8
    Electronic Resource
    Electronic Resource
    Thione Compounds of Copper and Silver: Tetrakis[1-methyl-2(1H)-pyridinethione-S]copper(I) Tetrafluoroborate and Tetrakis-[1-methyl-2(1H)-pyridinethione-S]silver(I) Tetrafluoroborate (1996)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 52 (1996), S. 1914-1917 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270196003666
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  • 9
    Electronic Resource
    Electronic Resource
    Indole-3-acetic acid uptake in isolated protoplasts of the moss Funaria hygrometrica (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 80 (1990), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Protoplasts of the moss Funaria hygrometrica Hedw were used to study the mechanism of Indole-3-acetic acid (IAA) accumulation. Three main components appeared to be involved.1. The pH gradient between plasma and outer medium is the basis for an anion trap. The protonophores carbonylcyanide m-chlorophenylhydrazone (CCCP) and carbonylcyanide p–trifluoromethoxyphenylhydrazone (FCCP) reduce IAA accumulation by destruction of the pH gradient.2 An intact efflux carrier could be demonstrated by an increase of IAA accumulation with the efflux inhibitors 2,3,5–trüodo-benzoic acid (TIBA) and 1-naphthy-phthalamic acid (NPA). In efflux experiments, reduction of IAA efflux by the two inhibitors was directly demonstrated.3. The existence of an influx carrier was concluded from the strong stimulation of IAA accumulation by calcium in calcium-deprived protoplasts. It is postulated that this carrier system transports IAA anions, protons and Ca2+. A computer simulation of the accumulation process with the three components, including internal IAA concentration determined by enzyme-linked immunosorbent assay (ELISA), gave a highly accurate description of the data measured in the different experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1990.tb05682.x
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  • 10
    Electronic Resource
    Electronic Resource
    A new Y-tube olfactometer for mosquitoes to measure the attractiveness of host odours (1999)
    Springer
    Entomologia experimentalis et applicata 92 (1999), S. 9-19 
    Details
    ISSN: 1570-7458
    Keywords: mosquito ; Aedes aegypti ; host seeking behaviour ; lactic acid ; carbon dioxide ; host odour ; attractant ; olfactometer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In a new bioassay a small Y-shaped wind tunnel is used to quantitatively investigate the responses of mosquitoes to host odours. Female yellow fever mosquitoes, Aedes aegypti (L.) (Diptera: Culicidae) were tested to (1) a human hand, (2) an extract with human skin residues, (3) L-(+)-lactic acid, and (4) carbon dioxide. The responses to the skin extract followed a sigmoid dose response curve. The most effective dose attracted 80–90% of the mosquitoes within 30 s and was as effective as the human hand. L-(+)-lactic acid was identified in this extract and found attractive for mosquitoes also when presented alone. Carbon dioxide stimulated taking flight and was attractive, an effect which was synergistically enhanced in combination with L-(+)-lactic acid. The presented bioassay is especially suited to test the behavioural effects of synthetic odours as well as of natural odour sources. Due to the fast response of the mosquitoes, the sensitivity, and the simplicity of the testing procedure it is a potent tool in the search for new attractive components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003797623701
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