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  • 1995-1999
  • 1990-1994  (25)
  • 1985-1989
  • 1993  (14)
  • 1990  (11)
  • 1
    Electronic Resource
    Electronic Resource
    Processing of Bi2Sr2CaCu2Ox thick films from nitrate precursors (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 2558-2560 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High-quality Bi2Sr2CaCu2Ox/Ag superconducting tapes were fabricated directly from the nitrate salts of Bi, Sr, Ca, and Cu by the partial-melt-growth technique. Nitrate particles were deposited electrostatically on the Ag substrate and heat treated. After process optimization of the superconducting tapes, the best samples showed typical Tc of 89 K with zero applied field critical current density of 2×104 A/cm2 (Ic=11.2 A) at 77 K and 2.6×105 A/cm2 (Ic=190 A) at 4.2 K. Unlike films grown using solid state reacted precursor powders, these films lacked the typical Bi-free, needlelike defects and possessed a smooth morphology. X-ray diffraction patterns showed the film to be highly c-axis oriented. The processing of these tapes significantly reduces the overall fabrication time from precursor materials preparation to final heat treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110432
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Simulation study of a magnetohydrodynamic dynamo: Convection in a rotating spherical shell (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 2793-2805 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Numerical simulations on the thermal convection of a neutral fluid (without a magnetic field) in a rotating spherical shell have been carried out. The results indicate that sufficiently rapid rotation results in strong differential rotation, with a pronounced equatorial acceleration. The formation dynamics of convection columns aligned to the rotation axis is studied extensively. A new generation mechanism of differential rotation is then proposed which concludes that the fluid motion generates an equatorial acceleration by selectively exciting the cyclonic columns in the spherical shell.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860668
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation of highly isotactic poly(vinyl alcohol) (1993)
    s.l. : American Chemical Society
    Macromolecules 26 (1993), S. 559-560 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00055a025
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Local effects on tidal strain measurements at Esashi, Japan (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 102 (1990), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Finite element modelling has been used to make a quantitative investigation of local factors affecting the measurement of tidal strain at the Esashi earth tide station. Factors investigated, with the approximate magnitude of the perturbation produced by each, are topography (12 per cent), regional geology (1 per cent), inhomogeneity of the elastic properties of the granodiorite from which the strainmeter tunnels were excavated (3 per cent), and the cavity effect (2 per cent). Correction for these factors reduces the average discrepancy between the observed strains (observational accuracy ~1 per cent) and those predicted from the solid earth and ocean loading tide from 23 to 8 per cent.After such correction the ratios of observed to modelled amplitudes of the O1 and M2 tides on each strainmeter are in fair agreement, but these ratios differ from strainmeter to strainmeter; they are about 7 per cent too large on the N-S and NE-SW strainmeters and 9 per cent too small on the E-W instrument. These studies illustrate the difficulties involved in relating strains measured in an observatory such as Esashi to those representative of the surrounding region and suggest that, with the level of detail and sophistication used, this relationship cannot be modelled to much better than 10 per cent. Systematic differences between results from the mid-point and free-end strainmeters imply that the effects of small-scale rock inhomogeneities have not been modelled correctly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1990.tb04577.x
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  • 5
    Electronic Resource
    Electronic Resource
    Lunar synchronization of spawning in cichlid fishes of the tribe Lamprologini in Lake Tanganyika (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 37 (1990), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Lunar synchronization of spawning was investigated for eight substrate brooding cichlid fishes belonging to the tribe Lamprologini. Their spawning activities all peaked during the second quarter of the lunar cycle. Comparison between their breeding styles and the degrees of spawning synchronization suggested that the nocturnal guarding-efficiency of eggs, especially exposed ones, is improved by the maximal amount of moonlight during full moon and, in species whose young leave the breeding sites about 2 weeks after spawning, the survival of dispersing young is enhanced by the darkness of moonless nights.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1990.tb05891.x
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  • 6
    Electronic Resource
    Electronic Resource
    Theoretical analysis of Raman scattering induced by a twin photon beam with quantum correlation (1993)
    Springer
    Optical and quantum electronics 25 (1993), S. 311-316 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A Raman transition induced by a twin photon beam with quantum correlation, which is generated by nondegenerate parametric down-conversion, is theoretically analysed. The signal intensity of induced Raman scattering for the twin photon beam is twice as large as that for two coherent beams without correlation. Application of the twin photon beam is proposed for optical measurements of ESR spectra, which are useful for investigation of dislocations in semiconductor materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00420688
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Middle mesenteric artery: an anomalous origin of a middle colic artery (1993)
    Springer
    Surgical and radiologic anatomy 15 (1993), S. 361-363 
    Details
    ISSN: 1279-8517
    Keywords: Angiography ; Anomaly ; Mesenteric artery ; Middle mesenteric artery ; Middle colic artery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Un cas d'anomalie de l'artère mésentérique est rapporté. L'artère a été cathétérisée incidentallement lors de l'angiographie d'une patient présentant une tumeur rénale gauche. Elle naissait de l'aorte abdominale entre l'artère mésentérique supérieure et l'artère mésentérique inférieure. Elle montait directement à partir de son origine pour se distribuer au colon transverse et remplacer la branche colique moyenne normalement issue de l'artère mésentérique supérieure. Cette anomalie est sûrement le résultat d'une concentration anormale des artères viscérales impaires et médianes existant pendant la période embryonnaire. Ce type d'anomalie est très rare et justifierait le nom d'artère mésentérique moyenne.
    Notes: Summary A case of anomalous mesenteric artery is reported. The artery was incidentally cannulated during angiography of a patient with a left renal tumor. It arose from the abdominal aorta between the superior and inferior mesenteric arteries. The artery then ascended directly upwards from its origin and supplied the transverse colon replacing the middle colic branch of the superior mesenteric artery. The anomaly must be a result of a anomalous concentration of unpaired visceral arteries in the developing embryo. This type of anomaly is very rare and it would be appropriate to name the artery the middle mesenteric artery.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01627894
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  • 8
    Electronic Resource
    Electronic Resource
    Left superior vena cava continuing to the accessory hemiazygos without anastomosis with the coronary sinus (1993)
    Springer
    Surgical and radiologic anatomy 15 (1993), S. 151-154 
    Details
    ISSN: 1279-8517
    Keywords: Double superior vena cava ; Azygos vein ; Human variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Il a été observé un cas de double veine cave supérieure avec absence de la veine brachio-céphalique gauche. La veine cave supérieure gauche continuait la veine hémiazygos accessoire sans anastomose avec le sinus coronaire. Toutefois, le sang de la veine cave supérieure gauche se drainait dans la veine cave supérieure droite par une anastomose transverse entre les azygos droite et gauche. On pense que, 1) la veine inter-précardinale ne s'est pas formée, et 2) la veine précardinale gauche ne se continue pas dans la veine cardinale commune mais plutôt se draine dans l'azygos gauche. Ce cas doit reprśenter l'un des dispositifs les plus primitifs du système cave supérieur.
    Notes: Summary A case of double superior vena cava lacking the left brachiocephalic vein was found. The left superior vena cava directly continued to the accessory hemiazygos vein without anastomosis with the coronary sinus. Therefore, the blood from the left superior vena cava drained into the right superior vena cava via the transverse anastomosis between the left and right azygos lines. It was thought that embryologically 1) the inter-precardinal vein was not formed, and 2) the left precardinal vein did not continue to the common cardinal vein, rather it drained into the left azygos line. This case may represent one of the most basic arrangements of the superior caval system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01628317
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  • 9
    Electronic Resource
    Electronic Resource
    In situ hybridization of muscle mitochondrial mRNA in mitochondrial myopathies (1990)
    Springer
    Acta neuropathologica 81 (1990), S. 1-6 
    Details
    ISSN: 1432-0533
    Keywords: In situ hybridization ; Mitochondrial DNA ; Mitochondrial myopathy ; Ophthalmoplegia ; Cytochromec oxidase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary To determine whether a mitochondrial mRNA deficiency exists in mitochondrial myopathies, muscle biopsies from a patient with chronic progressive external ophthalmoplegia (CPEO) and a patient with mitochondrial myopathy, encephalopathy, lactic acidosis and stroke-like episodes (MELAS) were studied using in situ hybridization. Histochemistry and immunohistochemistry were performed along with hybridization. Hybridization reactions were widely distributed over the sarcoplasm of all muscle fibers in the patient with MELAS. In the patient with CPEO, 80% of the fibers showed a marked decrease in density of autoradiographic grains. This marked decrease corresponded to the histochemical and immunohistochemical findings of a very weak staining of cytochromec oxidase (CCO). The isotope-labeled cDNA probe used in in situ hybridization in this study complements a part of subunit I of CCO and a part of subunit II of complex I in the mitochondrial gene. Our results suggest a defect in the mRNA in this CPEO patient.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00662630
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  • 10
    Electronic Resource
    Electronic Resource
    Morphology and magnetic properties of ultrafine ZnFe2O4 particles (1990)
    Springer
    Applied physics 50 (1990), S. 13-16 
    Details
    ISSN: 1432-0630
    Keywords: 75.50.-y ; 76.80.+y ; 61.50.-f
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Well-crystallized ultrafine ZnFe2O4 particles of several nanometers in size have been prepared by the coprecipitation method, and their particle morphology and magnetic properties, especially at low temperatures, examined. Room-temperature X-ray diffraction, transmission electron microscopy, magnetization measurements at various temperatures from 300 K to 4.2 K, and Mössbauer spectroscopy at various temperatures from 300 K to 4.2 K, and at 4.2 K with a longitudinal magnetic field of 16.4 kOe applied have been employed. The formation of short-range and long-range magnetic order in small ZnFe2O4 particles above and below approximately 30 K is discussed. Below 30 K, the appearance of spontaneous magnetization and its hysteretic property is confirmed for small ZnFe2O4 particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323947
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