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  • Articles: DFG German National Licenses  (17)
  • 1990-1994  (17)
  • 1970-1974
  • 1990  (17)
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  • Articles: DFG German National Licenses  (17)
Material
Years
  • 1990-1994  (17)
  • 1970-1974
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Epitaxially grown sputtered LaAlO3 films (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 2019-2021 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have grown crystalline thin films of LaAlO3 using off-axis rf sputtering from a single stoichiometric target. The films grow epitaxially on SrTiO3 and LaAlO3 (100) substrates as well as on YBa2Cu3O7 thin films. We report on the growth conditions used to make these films, the properties of the films, and the properties of bilayer and trilayer structures containing both LaAlO3 and YBa2Cu3O7 films. Transmission electron microscopy cross-sectional and x-ray diffraction analyses indicate that all the constituent films in the multilayers grow epitaxially and that the interfaces between the films are sharply defined. Preliminary transport measurements on these multilayers show that LaAlO3 can be used for dielectric layers in a variety of high-temperature superconductor electronic circuits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104153
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Organic contaminants in an agricultural soil with a known history of sewage sludge amendments: polynuclear aromatic hydrocarbons (1990)
    s.l. : American Chemical Society
    Environmental science & technology 24 (1990), S. 1706-1711 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es00081a013
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Microwave properties of highly oriented YBa2Cu3O7−x thin films (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 1178-1180 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have performed intra- and extra-cavity microwave frequency (1–100 GHz) measurements on high quality Y1Ba2Cu3O7−x superconducting thin films on (100) LaAlO3 substrates. The ∼0.3 μm thin films fabricated by the pulsed laser deposition technique exhibit superconducting transition temperatures 〉90 K, as determined by resistivity and ac susceptibility measurements, and critical current densities of 5×106 A/cm2 at 77 K. Moreover, ion beam channeling minimum yields of ∼3% were measured, indicating the extremely high crystalline quality of films grown on the LaAlO3 substrate. Microwave surface resistance values at 77 K for these films are found to be more than one to two orders of magnitude lower than for copper at 77 K for almost the entire frequency range explored. We postulate that the reason we observe such low surface resistances in these films is the virtual absence of grain and phase boundaries coupled with the high degree of crystallinity. Furthermore, we believe that the residual resistance measured below Tc is at present dominated by losses occurring in the substrate and the cavities rather than by losses intrinsic to the Y-Ba-Cu oxide superconductor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103331
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Facile synthesis and structural principles of the strontium phenoxide Sr4(OPh)8(PhOH)2(THF)6 (1990)
    s.l. : American Chemical Society
    Inorganic chemistry 29 (1990), S. 2707-2708 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00340a002
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  • 5
    Electronic Resource
    Electronic Resource
    Systematic palaeontology and biostratigraphy of two Early Cretaceous condensed sections from the Barents Sea (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Polar research 8 (1990), S. 0 
    Details
    ISSN: 1751-8369
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Geosciences
    Notes: Bivalve, brachiopod and cirripede faunas from the latest Jurassic and Early Cretaceous Barents Sea boreholes 7320/3-U-l and 7425/9-U-l are systematically described and illustrated. Microfossils have also been studied and the cores arc dated on the basis of the fossil recovery. The bivalve Buchia whose zonal sequence has been used for correlation of boreal marine sections is the most important biostratigraphic marker group in the condensed Boreal Berriasian-Hauterivian intervals of these cores. A new species of cirripede Zeugmatolepas? borealis Collins sp. nov. and dinoflagellate cyst Muderongia aequicornusÅrhus sp. nov. are described.The Late Jurassic fine-grained elastics of core 7320/3-U-l are overlain by about 3 m of grey dolomitic limestone of Valanginian and Hauterivian age. The lowermost part of 7425/9-U-l is represented by a latest Volgian-earliest Berriasian fossiliferous greyish green marl. It is followed by a reddish brown fossilifcrous claystone of Berriasian and perhaps partly Valanginian age. Core 7425/9-U-l also contains a mainly Valanginian greyish green marly limestone which changes into a dark grey to black limestone of Early Barremian age in its upper part. The sedimentological change from condensation to dark grey clay deposition took place in the middle Barremian H. rude-fissicostatum ammonite Zone in 7425/9-U-l and probably slightly earlier in 7320/3-U-l. This was commenced at about the same time as deposition of the inaccurately and only indirectly dated fluvio-deltaic Festningen Sandstone Member on Spitsbergen. The dark claystone may thus be a distal equivalent to this sandstone unit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1751-8369.1990.tb00383.x
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  • 6
    Electronic Resource
    Electronic Resource
    Comparison of three different principles in the assessment of coronary flow reserve from digital angiograms (1990)
    Springer
    The international journal of cardiovascular imaging 5 (1990), S. 203-212 
    Details
    ISSN: 1573-0743
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In 70 patients without coronary disease we have compared three different principles to assess coronary flow reserve during diagnostic heart catheterization. Digital angiograms with ECG-triggered bolus injections of 4 to 8 ml of contrast medium at rest and after stimulation by dipyridamole (0,5 mg/kg i.v.) or papaverine (12,5 mg i.c.) were acquired in a 512×512 matrix at 8 bit resolution (ADAC 4100) and stored on a digital disk at 25 frames/sec. or 2 frames/cardiac cycle (PPR-mode). Angiograms were processed by cyclic R-wavegated mask mode subtraction and coronary flow in the LAD area was assessed by three different approaches: 1. A traditional densitometric principle. 2. The ‘CMAP’ principle. 3. A modification of the Stewart-Hamilton principle comparing the total amount of contrast medium that enters the coronary circulation to the area of the contrast dilution curve in a fixed portion of the LAD. Flow was measured simultaneously during angiography using the thermodilution technique for coronary sinus/great cardiac vein flow. Drug stimulation resulted in an increased coronary blood flow up to five times of resting flow. Regression analysis revealed the following results for the assessment of the coronary flow reserve by digital angiography (y) when compared to thermodilution (x): $$\begin{array}{*{20}c} {Method} & {Regression} & {Correlation} & {Standard Error} \\ 1 & {y = 1.36x + 0.02} & {r = 0.82} & {SEE = \pm 0.69} \\ 2 & {y = 0.99x + 0.22} & {r = 0.69} & {SEE = \pm 0.74} \\ 3 & {y = 1.30x - 0.21} & {r = 0.89} & {SEE = \pm 0.43} \\ \end{array}$$ Method 2 could be improved by replacing the density factor by morphometrically measured proximal LAD volume (y=0.77x+0.55; r=0.78; SEE=±0.43). In conclusion, our data suggest that the Stewart-Hamilton principle may be advantageous over time parameter-dependent approaches in the assessment of coronary flow reserve by digital angiography.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01833989
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    The effect of different alleles at the r locus on the synthesis of seed storage proteins in Pisum sativum (1990)
    Springer
    Plant molecular biology 14 (1990), S. 793-803 
    Details
    ISSN: 1573-5028
    Keywords: development ; legumin ; mRNA ; Pisum ; r locus ; seed
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Rocket immunoelectrophoresis was used to measure the accumulation of storage proteins in developing cotyledons of two Pisum sativum (pea) genotypes, that were close to isogenic except for the nature of the allele at the r locus. There was a marked decrease in legumin accumulation in the rr (wrinkled-seeded) genotype compared to the RR (round-seeded) genotype. The accumulation of vicilin did not differ greatly between the two genotypes. Pulse-labelling studies indicated that the differences in rates of accumulation of legumin between the rr and RR genotypes were a consequence of differences in rates of protein synthesis. Measurements of relative amounts of specific mRNAs, using cDNA clones as probes, showed lower amounts of legumin mRNA in developing cotyledons of the rr, compared to the RR, genotype. Both vicilin mRNAs and convicilin mRNA, the latter of which shows a similar temporal pattern of expression to those of the major legumin species, are relatively unaffected by the nature of the allele at the r locus. Nuclear run-on transcription experiments indicated no differences in the rate of synthesis of legumin transcripts in the rr and RR near-isolines. The consequences of homozygosity for the r allele on storage protein mRNA levels in vitro may be mimicked by manipulating the sucrose concentration of the culture medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00016512
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  • 8
    Electronic Resource
    Electronic Resource
    Transcervical tubal embryo-stage transfer (TC-TEST) (1990)
    Springer
    Journal of assisted reproduction and genetics 7 (1990), S. 137-140 
    Details
    ISSN: 1573-7330
    Keywords: in vitro fertilization ; tubal transfer ; embryo transfer ; ectopic pregnancy ; tubal disease ; uterine configuration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Ultrasound-guided transcervical tubal cannulation (TC-TEST) was used to replace embryos to the fallopian tubes in 17 women whose fallopian tubes were inaccessible by the abdominal route but where at least one tube was shown to be freely patent on a preliminary hsterosalpingogram investigation. In two further cases, the fallopian tubes proved impossible to cannulate, and along with two instances where difficulty was experienced, a common underlying feature was an arcuate or septate configuration of the uterus. Three pregnancies ensued (17%) in cases where the procedure was free of difficulty and the transfers were demonstrably intratubal: two went to term and the third resulted in an ectopic pregnancy. The procedure has so far not shown a benefit over conventional IVF-ET and probably should be avoided in women with any type of tubal disorder.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01135676
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  • 9
    Electronic Resource
    Electronic Resource
    Measurement ofg-factors in160Yb by aγ-γ coincidence technique (1990)
    Springer
    The European physical journal 335 (1990), S. 369-377 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Ky ; 23.20.Ck ; 23.20.En
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Aγ-γ coincidence technique has been developed forg-factor measurements of short-lived nuclear states. The method involvesγ-detection in 4π geometry as well as transient magnetic fields and the recoil-distance technique. A first experiment was performed for the isotope160Yb produced in the reaction64Ni(100Mo, 4n) at 430 MeV beam energy. The valueg=− 0.23(31) of the 14+ yrast state, which is compatible with zero, establishes thevi 13/2 quasiparticle structure to be responsible for the first backbend. A meang-factor for low spin states around the 4+ state,g=+0.48(26) was also derived as well as lifetimes for yrast states up toI π=8+.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290183
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  • 10
    Electronic Resource
    Electronic Resource
    Neutral pion production at 350 MeV/u in the system20Ne +27Al (1990)
    Springer
    The European physical journal 337 (1990), S. 351-352 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.-z ; 25.70.Np
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract π0 -production probability of (9± 2)· 10− 3 per20Ne+Al reaction has been measured at 350 MeV/u using the Two Arm Photon Spectrometer TAPS. This yield is consistent with an interpolation of published π-production rates in heavy ion collisions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289705
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