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  • Springer  (44)
  • American Physical Society  (31)
  • 1995-1999  (53)
  • 1990-1994  (22)
  • 1
    Electronic Resource
    Electronic Resource
    Electron and hole doping in NiO (1995)
    Springer
    The European physical journal 97 (1995), S. 83-93 
    Details
    ISSN: 1434-6036
    Keywords: 79.60 ; 71.20 ; 71.28
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have investigated hole doped (by lithium) and electron-doped (by nickel metal) NiO with photoemission (PES), inverse photoemission (IPES) and low and high energy electron energy loss spectroscopy (EELS). Both types of doping create empty states approximately in the middle of the charge transfer gap of undoped NiO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01317591
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  • 2
    Electronic Resource
    Electronic Resource
    Gas-dynamic consideration of the laser evaporation synthesis of single-wall carbon nanotubes (1999)
    Springer
    Applied physics 69 (1999), S. S593 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 81.05.Tp; 81.10.Jt
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. The abundance of carbon single-wall nanotubes (SWNTs) in soot synthesized by pulsed laser evaporation of graphite is studied over a wide range of synthesis conditions. The derived SWNT growth time-scale appears to be much longer than any characteristic time-scale in a simplified model of the relaxation of a high-pressure hot condensing gas bubble in a background atmosphere. It is concluded that SWNT nucleation and growth take place in relaxed, condensed, thermalized evaporation products at an optimal temperature between 850–1250 °C at a rate of few μm length per second, which is consistent with a condensed state “precipitation” mechanism for the SWNT formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051483
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  • 3
    Electronic Resource
    Electronic Resource
    The metallofullerene Tm@C82: isomer-selective electronic structure (1998)
    Springer
    Applied physics 66 (1998), S. 281-285 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 71.20Tx
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: 82 using photoemission and electron energy-loss spectroscopy in transmission. In particular, the impact of the isomer symmetry of the C82 cage (Cs or C3v) on the electronic structure and on the optical properties is analysed in detail. For both isomers, combined XPS and XAS measurements of the Tm 4f and 4d states offer conclusive proof of a divalent encaged Tm ion. No significant change of the valence of the rare earth ion upon changes in the cage symmetry is observed. From the C 1s excitation spectra we find a more pronounced LUMO for the C3v(8) isomer, as is expected for the higher symmetry of the cage. Additional information about the optical properties was obtained from the low-energy loss function. With use of a Kramers–Kronig analysis, the dielectric function, ε, and the optical conductivity, σ, have been derived. ε(0) and the onset of the spectral weight are found to be 7.7 [12.8] and 0.6 eV [0.8 eV] for the Cs(6) {C3v(8)} isomer, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050667
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  • 4
    Electronic Resource
    Electronic Resource
    The electronic structure of polymerized fullerenes and dimerized heterofullerenes (1997)
    Springer
    Applied physics 64 (1997), S. 301-305 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 61.46+w; 71.20.Tx; 71.20.-b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: \chem{Rb_1C_{60}} and dimerised \chem{C_{59}N} using electron energy-loss spectroscopy in transmission. From the C1s excitation spectra a reduced density of \pi^\star states is observed for polymerized \chem{Rb_1C_{60}} . This is in contrast to \chem{(\chem{C_{59}N})_2} and can be explained by the different type of \squt{doping} and by the different bonding between the fullerene molecules in the two systems. Additional information about the optical properties was obtained from the low energy loss function. Using a Kramers-Kronig analysis, the dielectric function, ( \epsilon ), and the optical conductivity, ( \sigma ), have been derived. \epsilon(0) and the onset of the spectral weight have been compared between the polymer, the dimer and \chem{C_{60}} . This onset of spectral weight is found to be at \valunit*{1.2}{\eV} and \valunit{1.4}{\eV} for o- \chem{Rb_1C_{60}} and for \chem{(\chem{C_{59}N})_2} , respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050482
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of eruption history and cooling rate on lava dome growth (1995)
    Springer
    Bulletin of volcanology 57 (1995), S. 229-239 
    Details
    ISSN: 1432-0819
    Keywords: Lava dome ; Lava flowmechanisms ; Laboratory simulations ; Mt St Helens ; Soufrière of St Vincent ; Venus volcanism ; Pancake domes ; Planetary volcanism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract To better understand the factors controlling the shapes of lava domes, laboratory simulations, measurements from active and prehistoric flows and dimensional analysis were used to explore how effusion history and cooling rate affect the final geometry of a dome. Fifty experiments were conducted in which a fixed volume of polyethylene glycol wax was injected into a tank of cold sucrose solution, either as one continuous event or as a series of shorter pulses separated by repose periods. When the wax cooling rates exceeded a critical minimum value, the dome aspect ratios (height/diameter) increased steadily with erupted volume over the course of a single experiment and the rate at which height increased with volume depended linearly on the time-averaged effusion rate. Thus the average effusion rate could be estimated from observations of how the dome shape changed with time. Our experimental results and dimensional analyses were compared with several groups of natural lava flows: the recently emplaced Mount St Helens and Soufrière domes, which had been carefully monitored while active; three sets of prehistoric rhyolite domes that varied in eruptive style and shape; and two sets of Holocene domes with similar shapes, but different compositions. Geometric measurements suggest that dome morphology can be directly correlated with effusion rate for domes of similar composition from the same locality, and that shape alone can be related to a dimensionless number comparing effusion rate and cooling rate. Extrapolation to the venusian ‘pancake domes’ suggests that they formed from relatively viscous lavas extruded either episodically or at average effusion rates low enough to allow solidified surface crust to exert a dominating influence on the final morphology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265423
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  • 6
    Electronic Resource
    Electronic Resource
    Expression of mRNA for vasoactive intestinal peptide in normal human colon and during inflammation (1995)
    Springer
    Molecular and cellular biochemistry 142 (1995), S. 1-7 
    Details
    ISSN: 1573-4919
    Keywords: vasoactive intestinal peptide ; ulcerative colitis ; gene expression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The availability of colon provides a ready source of human neurons. Among the products of nerve cell bodies, vasoactive intestinal peptide is a neuropeptide that serves as a marker of non-adrenergic, non-cholinergic inhibitory nerves in colon. These nerves have been proposed to be involved in regulation of immune function, secretion, and smooth muscle function. In previous work, we identified decreased tissue levels of vasoactive intestinal peptide in a disorder of chronic colonic mucosal inflammation, ulcerative colitis. We hypothesized that diminished gene expression of vasoactive intestinal peptide could result in decreased tissue levels of this neuropeptide. Sigmoid colon was obtained at surgery from controls (n=6) and patients with ulcerative colitis (n=6). Vasoactive intestinal peptide mRNA was quantified by Northern blot hybridization and tissue levels of vasoactive intestinal peptide were determined by radioimmunoassay. Tissue vasoactive intestinal peptide was decreased only in the mucosalsubmucosal layer of ulcerative colitis (p=.02). There was a single 1.7 kbase vasoactive intestinal peptide transcript identified in both control colon and ulcerative colitis. Normalized vasoactive intestinal peptide mRNA levels were increased by 260% in ulcerative colitis compared to controls (p〈.01). These observations suggest that decreased vasoactive intestinal peptide gene expression or abnormal post-transcriptional processing are not primary defects in this disorder of chronic inflammation. The findings support the alternative hypothesis that axonal degeneration in ulcerative colitis could result in increased expression of neuronal vasoactive intestinal peptide mRNA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00928907
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  • 7
    Electronic Resource
    Electronic Resource
    Partial purification and immunological characterization of 1,3-β-glucan synthase from suspension cells of Glycine max (1990)
    Springer
    Planta 181 (1990), S. 343-348 
    Details
    ISSN: 1432-2048
    Keywords: Callose ; Cell culture (1,3-β-glucan synthase) ; Digitonin-1,3-β-Glucan synthase (purification, immunology) ; Glycine (1,3-β-glucan synthase)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The plasma-membrane-localized 1,3-β-glucan synthase (EC 2.4.1.34) from suspension cultures of Glycine max (L.) Merr. was greatly enriched by a three-step purification procedure. Starting with a microsomal preparation, a six- to eightfold enrichment of the enzyme was achieved by isolating plasma-membrane vesicles in a polyethyleneglycol/dextran two-phase system. The enzyme was solubilized with the nonionic detergent digitonin and further purified 12-fold by successive centrifugations on two linear sucrose density gradients. The most purified enzyme preparation showed enrichment in a 31-kilodalton (kDa) polypeptide and was used to raise polyspecific antibodies which precipitated 1,3-β-glucan synthase activity. These antibodies were purified by affinity chromatography against immobilized membrane protein fractions of lower molecular weight which were devoid of 1,3-β-glucan synthase activity. The purified antibodies specifically labelled a single polypeptide of 31 kDa in the 1,3-β-glucan-synthase-containing heavy fractions of the first sucrose gradient indicating that this polypeptide represents part of the active enzyme complex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00195886
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  • 8
    Electronic Resource
    Electronic Resource
    EELS and XPS investigations of Ba2Cu3O4Cl2 (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 353-358 
    Details
    ISSN: 1573-7357
    Keywords: 71.27.+a ; 74.72.Jt ; 79.60.−i ; 79.20.Kz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Electron energy-loss spectroscopy in transmission and x-ray photoelectron spectroscopy have been applied to investigate single crystalline Ba2Cu3O4Cl2 to obtain the loss-function along the high symmetry directions of the cuprate plane, the Cu2p and O1s excitation edges, and to study the valence band and the core level electronic structure. The lossfunction shows a gap of 1.65eV, practically dispersionless structures between 2 and 8eV, and a volume plasmon located at 25eV. The dielectric function is derived. The excitation edges are a measure for the number of holes located in the Cu like or O like states parallel or perpendicular to the Cu3O4 planes. The Cu2p3/2 XPS shows three features in the main line and a satellite structure due to two independent copper sites and indicating a strong 3d electron correlation. By interpreting forward scattering features the valence band structure can be assigned to its atomic origin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00768411
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  • 9
    Electronic Resource
    Electronic Resource
    Dielectric properties of YNi2B2C (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 1659-1664 
    Details
    ISSN: 1573-7357
    Keywords: 74.72Bk ; 78.00 ; 79.20Kz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The dielectric function of the quarternary superconductor YNi2B2C has been derived in an energy range from WmeV up to 50eV by linking together optical reflectance and electron energy loss measurements, obtained from polycrystalline samples at room temperature. The low energy part of the spectrum was additionally investigated in a temperature range from 10K up to 300K. In order to determine the anisotropy of this compound, the reflectance spectra of a single crystal were taken, using polarized light with polarization along the crystallographic axes. The single crystal data exhibit a normal Drude-like metallic behaviour, while the polycrystalline data can only be interpreted by means of a strong energy dependent scattering rate, which has been interpreted as resulting from strong electron-phonon coupling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00753938
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  • 10
    Electronic Resource
    Electronic Resource
    The hole distribution in cuprate chains (1999)
    Springer
    Journal of low temperature physics 117 (1999), S. 407-411 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The electronic structure of the prototypical corner-sharing Sr2CuO3 linear chain compound is investigated by combining several theoretical and experimental techniques. Band structure calculations within the local density approximation and using a local orbital basis provided the relevant orbitals and the transfer integrals for a four-band extended Hubbard pd-model, which was treated by means of exact diagonalization and of quantum Monte Carlo calculations for finite chain clusters. The band structure values of the transfer integrals t pd exceed the corresponding values for layered cuprates. Enhanced values of the intersite Coulomb interaction, V pd = 2 ... 2.5 eV, and a difference between the onsite energies of side and chain oxygen Δpp = 0.5 ... 0.75 eV are deduced from the comparison of the model studies with the intensities of polarization dependent x-ray absorption spectra. The latter reflect the hole distribution over the oxygen sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022534103636
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