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  • Artikel  (75)
  • Springer  (42)
  • American Institute of Physics  (19)
  • Copernicus  (14)
  • 2005-2009  (35)
  • 1990-1994  (40)
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  • Artikel  (75)
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  • 1
    facet.materialart.
    Unbekannt
    A new design for a UHV compatible Czochralski crystal growth system (1990)
    American Institute of Physics
    Details
    Publikationsdatum: 1990-09-01
    Print ISSN: 0034-6748
    Digitale ISSN: 1089-7623
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Publiziert von American Institute of Physics
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Muoproduction ofJ/ψ and the gluon distribution of the nucleon (1992)
    Springer
    The European physical journal 56 (1992), S. 21-28 
    Details
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Measurements are presented of the inclusive distributions of theJ/Ψ meson produced by muons of energy 200 GeV from an ammonia target. The gluon distribution of the nucleon has been derived from the data in the range 0.04〈x〈0.36 using a technique based on the colour singlet model. An arbitrary normalisation factor is required to obtain a reasonable integral of the gluon distribution. Some comments are made on the use ofJ/Ψ productionby virtual photons to extract the gluon distribution at HERA.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01589703
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Comparison of forward hadrons produced in muon interactions on nuclear targets and deuterium (1991)
    Springer
    The European physical journal 52 (1991), S. 1-11 
    Details
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Differential multiplicities of forward produced hadrons in deep inelastic muon scattering on nuclear targets have been compared with those from deuterium. The ratios are observed to increase towards unity as the virtual photon energy increases with no significant dependence on the other muon kinematic variables. The hadron transverse momentum distribution is observed to be broadened in nuclear targets. The dependence on the remaining hadron variables is investigated and the results are discussed in the framework of intranuclear interaction models and in the context of the EMC effect.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01412322
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  • 4
    Digitale Medien
    Digitale Medien
    Forward produced hadrons in μp and μd scattering and investigation of the charge structure of the nucleon (1991)
    Springer
    The European physical journal 52 (1991), S. 361-387 
    Details
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Final data measured with the EMC forward spectrometer are presented on the production of forward charged hadrons in μp and μd scattering at incident beam energies between 100 and 280 GeV. The large statistic of 373 000 events allows a study of the semi-inclusive hadron production as a function ofz,p T 2 and 〈p T 2 〉 in smallQ 2,x Bj andW bins. Charge multiplicity ratios and differences as a function ofz andx Bj are given forp, d andn-targets. From the differences of charge multiplicities the ratio of the valence quark distributions of the protond v (x)/u v (x) is determined for the first time in charged lepton scattering. The Gronau et al. sum rule is tested, the measured sum being 0.31±0.06 stat. ±0.05 syst., compared with the theoretical expectation of 2/7≈0.286. The measured sum corresponds to an absolute value of the ratio of thed andu quark charge of 0.44±0.10 stat.±0.08 syst.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01559431
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Do the penicillin antibiotics interact with digoxin? (1994)
    Springer
    European journal of clinical pharmacology 46 (1994), S. 479-480 
    Details
    ISSN: 1432-1041
    Schlagwort(e): Digoxon ; Amoxycillin ; Flucloxacillin ; penicillin V penicillin antibiotics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00191916
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Feeding, growth and bioluminescence of the heterotrophic dinoflagellate Protoperidinium huberi (1994)
    Springer
    Marine biology 121 (1994), S. 373-380 
    Details
    ISSN: 1432-1793
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Feeding, growth and bioluminescence of the thecate heterotrophic dinoflagellate Protoperidinium huberi were measured as a function of food concentration for laboratory cultures grown on the diatom Ditylum brightwellii. Ingestion of food increased with food concentration. Maximum ingestion rates were measured at food concentrations of ∼600 μg C l-1 and were ∼0.7 μg C individual-1 h-1 (1.8 D. brightwelli cells individual-1 h-1). Clearance rates decreased asymptotically with increasing food concentration. Maximum clearance rates at low food concentration were ca. 23 μl ind-1 h-1, which corresponds to a volume-specific clearance rate of 5.9x105 h-1. Cell size of P huberi was highly variable, with a mean diameter of 42 μm, but no clear relationship between cell size and food concentration was evident. Specific growth rates increased with food concentration until maximum growth rates of ∼0.7 d-1 were reached at a food concentration of 400 μg C l-1 (∼1000 cells ml-1). Food concentrations as low as 10 μg C l-1 of D. brightwellii (∼25 cells ml-1) were able to support growth of P. huberi. The bioluminescence of P. huberi varied with its nutritional condition and growth rate. Cells held without food lost their bioluminescence capacity in a matter of days. P. huberi raised at different food concentrations showed increased bioluminescence capacity, up to food concentration that supported maximum growth rates. The bioluminescence of P. huberi varied over a diel cycle, and these rhythmic changes persisted during 48 h of continuous darkness, indicating that the rhythm was under endogenous control.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00346747
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  • 7
    Digitale Medien
    Digitale Medien
    Residual stress measurement in thermal sprayed hydroxyapatite coatings (1994)
    Springer
    Journal of materials science 5 (1994), S. 756-759 
    Details
    ISSN: 1573-4838
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin , Technik allgemein
    Notizen: Hydroxyapatite coatings have been used for many years on dental and prosthetic implants to provide a biocompatible surface for long-term fixation of the implant to bone. In this study two thermal spraying processes, air plasma spraying (APS) and a high velocity oxy fuel process (CDS) have been employed to produce hydroxyapatite coatings. An X-ray diffraction technique (XRD) has been applied to measure the residual stresses in thermal sprayed hydroxyapatite coatings. It has been shown that such stresses are sensitive to spraying parameters and that the newer high velocity oxy fuel spraying process results in lower residual stresses than the conventional air plasma spraying process. Heat treatment of the coating has been shown to significantly reduce the residual stress in the coating.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00120371
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    An evaluation of the use of infrared heating for contouring 30% short carbon-fibre-reinforced PEEK (1992)
    Springer
    Journal of materials science 3 (1992), S. 88-94 
    Details
    ISSN: 1573-4838
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin , Technik allgemein
    Notizen: Abstract The ability to contour reinforced composites at specific points would allow these low modulus, high strength materials to be utilized in a wide variety of new applications. Contourable materials of this type would be especially suitable for orthopaedic applications such as internal fixation of fractures where plate removal due to stress shielding and bone resorption are major concerns. To this end, the high-temperature contourability of 30% short carbon-fibre-reinforced PEEK was investigated. The use of infrared radiation to heat this material to temperatures suitable for contouring was developed and refined into a protocol for heating and bending 12.4×6.4 mm injection-moulded flexural testing bars. To evaluate the heating, contouring and cooling effects of this processing on the material's mechanical and physical properties, five specimen groups were tested: control, extended heat only, cyclical heat only, repeated contouring, and repeated contouring-quenched. Each group's flexural properties, fracture toughness, post-contouring matrix crystallinity and extent of fibre-matrix wetout were monitored. The two heat only groups showed no significant changes in any properties compared to control. For the contoured groups, the quenched subgroup showed a minimal 0–9% decrease in all categories. The non-quenched group showed only a 0–6% change. The resilience of short carbon-fibre-reinforced, PEEK after severe thermo-mechanical cycling is convincing evidence of this material's suitability for structural applications, especially in which contourability and fast processing are required. This study demonstrates the thermoductility of CFR PEEK.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00705274
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    On the linear instability of the Hall-Stewartson vortex (1990)
    Springer
    Theoretical and computational fluid dynamics 2 (1990), S. 27-46 
    Details
    ISSN: 1432-2250
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract It is demonstrated that the Hall-Stewartson leading-edge vortex is linearly unstable to viscous perturbations of the center-mode type. Center modes are found to occur in two reigons of Reynolds-number-wave-number space, in limits in which the axial wave number is large. The appropriate center-mode equations in these neighborhoods are established, and it emerges that the two sets are identical. The single system of equations, which depends on the azimuthal wave number m and a distance parameter σ only, is solved numerically for various values of m and σ. Highly unstable modes are found for large positive σ, and the results are shown to be in good agreement with proposed asymptotic expansions when ‖σ‖〉1. To lowest order, unstable modes have phase surfaces that rotate with the fluid: in addition constant phase surfaces propagate upstream but the group velocity is directed downstream. The growth rate of the instability increases faster than Reynolds number to the quarter power. This, together with the finding that the length scale of the unstable modes found goes to zero as the Reynolds number tends to infinity, makes this instability an unusual one.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00271427
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  • 10
    Digitale Medien
    Digitale Medien
    Localization of target cells and improvement ofAgrobacterium-mediated transformation efficiency by direct acetosyringone pretreatment of carrot root discs (1993)
    Springer
    Protoplasma 174 (1993), S. 10-18 
    Details
    ISSN: 1615-6102
    Schlagwort(e): Acetosyringone ; Agrobacterium ; Carrot ; Cell cycle ; GUS assay ; Indole acetic acid levels
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Localization of target cells forAgrobacterium-mediated transformation in the carrot root disc model has been achieved after inoculation with a disarmedA. tumefaciens strain harbouring a GUS-intron construct. The first GUS positive cells could be detected on both sides of the discs 48 h after inoculation. The transformed cells were always more numerous on the apical side, mainly localized in the intrafascicular cambium and in the immature phloem strands. The kinetics of free endogenous IAA levels on both sides after wounding have been determined, indicating that rapid IAA accumulation on the apical side was not simply due to polar migration from the basal side. Attempts to optimize transformation efficiency were made by pretreating the discs with various concentrations of acetosyringone (AS) and/or naphthalene acetic acid (NAA). Surprisingly, while 25 μM AS applied to bacteria prior to the inoculations was ineffective, the same AS concentration applied as a pretreatment to the discs strongly increased the number of transformed cells in the target tissues and decreased the lag time for the appearance of the first GUS positive cells. NAA pretreatment on the basal side enhanced the AS effect. AS pretreatment was found both to advance the reentry of competent cells with a potential for cell division into the S phase of the cell cycle and to stimulate bacterial attachment to the cell walls. The relationship between transformation efficiency and DNA synthesis in the host cells is discussed. AS treatment of plant tissues prior to inoculation is proposed as a means of increasing the transformation rates.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01404037
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