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  • 1
    Electronic Resource
    Electronic Resource
    Effect of stoichiometry and post-annealing conditions on magnetron sputtered films of YBa2Cu3O7 on cubic zirconia (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 1644-1647 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High-quality YBa2Cu3O7 films supported on yttrium stabilized cubic zirconia were made by simultaneous reactive magnetron sputtering using yttrium, barium, and copper metal targets. Superconductivity onsets of 92 K with transition widths of 1.5 K (10%–90%) have been achieved on yttrium stabilized cubic zirconia substrates. Various aspects of the deposition processes are described and the effect of deposition parameters and post-annealing on thin-film stoichiometry, structure, and superconducting properties is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342932
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  • 2
    Electronic Resource
    Electronic Resource
    Analysis of the energy consumption of LaB6 cathodes in SEM applications (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 2646-2649 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The power required to heat a lanthanum hexiboride cathode for use in scanning electron microscopes (SEM) has been calculated and found to be in close agreement with experimental measurements. The analysis indicates that direct heating of the LaB6 by the heater current, and efficient heat transfer to the cathode from the heated supports, results in low power consumption. The operating temperature of the cathode support material must be carefully designed to avoid poisoning of the LaB6 by excessive metal evaporation and deposition on the cathode. The LaB6 cathode developed here is well suited to the small heater power supply of the SEM and improves the picture quality over the traditional tungsten filament cathodes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140687
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  • 3
    Electronic Resource
    Electronic Resource
    The case of the troubling doubling. Isoatisine and 19-epiisoatisine from the Chinese herb guan-bai-fu (Aconitum koreanum) (1987)
    s.l. : American Chemical Society
    The @journal of organic chemistry 52 (1987), S. 5051-5053 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00231a047
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  • 4
    Electronic Resource
    Electronic Resource
    Four spectral classes of cone in the retinas of birds (1986)
    Springer
    Journal of comparative physiology 159 (1986), S. 473-479 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The spectral sensitivity of 15 species of birds has been measured by recording transretinal voltages from opened eyecups. With suitable combinations of colored adapting lights, we find that a variety of passerines have four peaks of photopic sensitivity, with maxima at 370, 450, 480, and 570 nm. Additional sensitivity maxima at 510 nm are found in some species. The spectral sensitivity functions are not altered by bathing the retinas in 50 mM sodium aspartate, suggesting that they reflect the properties of cones and do not result from inhibitory interactions between retinal interneurons. Comparison of the results with a general mathematical model that describes spectral sensitivity functions recorded extracellularly from populations of receptors in different states of adaptation (Goldsmith 1986) shows that the retinal spectral sensitivity functions are consistent with the presence of (at least) four types of cone, but indicate as well that many of the cones that are maximally sensitive in the blue and violet likely contain oil droplets that attenuate the deep violet and near uv.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00604167
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  • 5
    Electronic Resource
    Electronic Resource
    Phylogeny and physiology of Drosophila opsins (1994)
    Springer
    Journal of molecular evolution 38 (1994), S. 250-262 
    Details
    ISSN: 1432-1432
    Keywords: Opsin ; Visual pigments ; Gene family ; Evolution ; Phylogeny ; Spectral sensitivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phylogenetic and physiological methods were used to study the evolution of the opsin gene family in Drosophila. A phylogeny based on DNA sequences from 13 opsin genes including representatives from the two major subgenera of Drosophila shows six major, well-supported clades: The “blue opsin” clade includes all of the Rhl and Rh2 genes and is separated into two distinct subclades of Rhl sequences and Rh2 sequences; the ultraviolet opsin clade includes all Rh3 and Rh4 genes and bifurcates into separate Rh3 and Rh4 clades. The duplications that generated this gene family most likely took place before the evolution of the subgenera Drosophila and Sophophora and their component species groups. Numerous changes have occurred in these genes since the duplications, including the loss and/or gain of introns in the different genes and even within the Rhl and Rh4 clades. Despite these changes, the spectral sensitivity of each of the opsins has remained remarkably fixed in a sample of four species representing two species groups in each of the two subgenera. All of the strains that were investigated had R1-6 (Rhl) spectral sensitivity curves that peaked at or near 480 nm, R7 (Rh3 and Rh4) peaks in the ultraviolet range, and ocellar (Rh2) peaks near 420 nm. Each of the four gene clades on the phylogeny exhibits very conservative patterns of amino acid replacement in domains of the protein thought to influence spectral sen sitivity, reflecting strong constraints on the spectrum of light visible to Drosophila.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00176087
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  • 6
    Electronic Resource
    Electronic Resource
    Investigation of Factors Influencing the Formation of Tungstate-Based Inorganic-Organic Hybrid Nanobelts/Nanotubes (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 352 (Aug. 2007), p. 85-88 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Tungstate-based inorganic−organic hybrid nanobelts/nanotubes were synthesized in asystem of H2W2O7·xH2O/n-octylamine/heptane (n-octylamine:H2W2O7·xH2O molar ratio: 30), andthe effects of the volume ratios of heptane to n-octylamine and the amounts of interlayer water inH2W2O7·xH2O on the formation behavior of the hybrids were investigated. The belt/tubelike hybridsobtained were 10–20 +m in length and 200–500 nm in apparent diameter. Large volume ratios ofheptane to n-octylamine not only enhanced the degree of the long-range order of the lamellarstructures in the hybrids, but they also improved the morphologic uniformity of the hybrids. Theexistence of interlayer water in H2W2O7·xH2O was indispensable to the formation of tungstate-basedinorganic−organic hybrid nanobelts/nanotubes. The amounts of interlayer water in H2W2O7·xH2Ovaried over a wide range (x, from 0.85 to 4.1), had a neglectable effect on the morphology of thetungstate-based nanophase hybrids, but exerted a remarkable influence on the rate of the reaction ofH2W2O7·xH2O with n-octylamine in the heptane solvent. The larger the amount of interlayer water,the more rapid the reaction rate
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.352.85.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis of YIG Nanopowders by Sol-Gel Method (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 582-584 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Yttrium iron garnet (YIG) nanopowders were synthesized by sol-gel method usingFe(NO3)3·9H2O, Y(NO3)3·6H2O as raw materials. The influence of heat treatment, the citric acid to metalnitrates molar ratio (CA / MN) and PH value on the synthesized powders were investigated usingscanning electron microscopy (SEM), thermal analyses (DTA/TGA) and X-ray diffraction (XRD). YIGpowders with average grain size of 80~90nm were synthesized after calcining at 1000°C for 4h
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.582.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Application, Development and Prospects of After-Treatment Technology in Conventional Abrasive Materials (2002)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 224-226 (June 2002), p. 735-738 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/46/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.224-226.735.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    On the strategy for processing modal shapes with the clustered natural frequencies (1991)
    Springer
    Acta mechanica solida Sinica 4 (1991), S. 127-137 
    Details
    ISSN: 0894-9166
    Keywords: natural vibration analysis ; modal analysis ; modal identification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract In this paper, it is pointed out that when several natural frequencies of a structure are clustered in a narrow band the individual modal shapes are very hard to measure or calculate with acceptable accuracy, whereas the invariant subspace spanned by them can be easily determined. It is recommanded that the sine of the included angle of two subspaces of equal dimensions may be used as an index for measuring the difference of the subspaces. A simple method is proposed for calculating the cosine of the included angle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02209127
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  • 10
    Electronic Resource
    Electronic Resource
    Analysis and Simulation of Sensor Structure Parameters and Filling Materials Characteristics for Electrical Capacitance Tomography System (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 575-578 (Apr. 2008), p. 1217-1221 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The object of this paper concerns with the research of 8-electrode oil-water two-phase flowelectrical capacitance tomography system. The distribution models of sensor’s field are established bythe finite element method for the influence of the parameters of sensor’s structure on the performanceof sensor. The analyses of simulation and experiment and the sensor’s optimization design are done,and the measure function of sensor’s optimization design is proposed based on sensor parameters thatare listed as follows: length of electrodes, stretch angle of electrodes, thickness of pipeline,permittivity, thickness of stuff filled between screen and electrodes, radial electrodes and so on. Inconclusion, the final parameters and materials adopted are proved better than those adopted before.Consequently the sensitivity and uniformity of the sensitive field is improved and the design of themeasurement circuit is easier, and the data precision of sensitive field is enough for imagereconstruction
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.575-578.1217.pdf
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