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  • 1
    Electronic Resource
    Electronic Resource
    A 200 GHz near field measurement system (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 2526-2532 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have designed a near field measurement system operating at 200 GHz which has a dynamic range of 60 dB. The system has a short term and long term phase variation less than 0.5° and 2°, respectively. On averaging 128 times at each measurement point by using the averaging function of the network anaylzer, the short term phase variation decreases to less than 0.2°. The phase variation mentioned above is observed with the testing probe pointing to the center of the antenna under test. The contours of the near field obtained shows that the field is highly circular as expected from the theoretical predication. We have shown that the system can distinguish the quality of the corrugated feed horn by near field measurement. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149786
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  • 2
    Electronic Resource
    Electronic Resource
    A novel sensitive method of surface impedance measurement for small samples (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 469-473 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We propose a novel sensitive method of surface impedance measurement for small samples utilizing a YIG delay line. We will give a full analysis of the relationship between the phase and amplitude of the signals to surface impedance. The sensitivity of this method will be fully addressed. The dispersion relations of magnetostatic waves guided by lossy ground planes will also be given as byproducts of the above analysis. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148684
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  • 3
    Electronic Resource
    Electronic Resource
    High temperature surface peaks and surface reconstruction of the (001) SrTiO3−δ substrate surfaces studied by channeling (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 317-319 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature dependence of the surface peaks of the (001) SrTiO3 substrate surfaces was studied for the sample temperature up to 750 °C by channeling. The temperature dependence of the Sr surface peaks was found to be due to the thermal vibration of the Sr atoms. However, an anomalous temperature dependence of the Ti surface peak was observed which may be due to the displacement of Ti surface atoms. The Ti surface peaks are maximum at 400 °C. For the reduced SrTiO3−δ, surface reconstruction was observed on the Sr surface sublattice but the anomalous temperature dependence of the Ti surface peak disappeared. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.113530
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  • 4
    Electronic Resource
    Electronic Resource
    Urease. VII - Some observations on the assay method of Sumner
    Amsterdam : Elsevier
    Analytical Biochemistry 17 (1966), S. 60-65 
    Details
    ISSN: 0003-2697
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0003-2697(66)90007-8
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  • 5
    Electronic Resource
    Electronic Resource
    Urease. VI - A new method of assay and the specific enzymic activity
    Amsterdam : Elsevier
    Analytical Biochemistry 17 (1966), S. 49-59 
    Details
    ISSN: 0003-2697
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0003-2697(66)90006-6
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  • 6
    Electronic Resource
    Electronic Resource
    Dissociation of urease in acetate buffer of pH 3.5 with retention of the enzymatic activity (1968)
    Springer
    Cellular and molecular life sciences 24 (1968), S. 685-687 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Riassunto Le molecole dell'urease (peso molecolare 480,000, coefficiente di sedimentazione 18,6 S) si dividono a metà quando trattate con tampone acetato, 0,1M, pH 3,5. Inizialmente, l'attività enzimatica è 40% di quella al pH 7 (tampone fosfato, 0,34M) e la dissociazione è riversibile. Prolungata esposizione al pH 3,5 causa una lenta denaturazione, con perdita dell'attività e dell'abilità di ricostituirsi.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02138313
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  • 7
    Electronic Resource
    Electronic Resource
    Urease. VIII. Its interaction with sodium dodecyl sulfate (1967)
    Springer
    Cellular and molecular life sciences 23 (1967), S. 443-445 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Riassunto Il dodecilsolfato di sodio causa la dissociazione dell'urease (massa molecolare 480,000) in una maniera che dipende fortemente sulla concentrazione relativa dei reagenti. Il prodotto ottenuto con un sufficiente eccesso di detergente ha una massa molecolare di 50,000–60,000.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02142167
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  • 8
    Electronic Resource
    Electronic Resource
    Resonant Rutherford backscattering. Study ofa-axis YBaCuO films with very high crystallinity (1995)
    Springer
    Journal of superconductivity 8 (1995), S. 759-764 
    Details
    ISSN: 1572-9605
    Keywords: a-axis YBCO ; Rutherford backscattering ; sputtered films
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Hybrid sputtering and the conventional dc-template sputtering methods were used to deposit highly crystallinea-axis films. The oxygen contents and disorder of the films were measured by the resonant Rutherford backscattering. The oxygen content of the films deposited by the hybrid sputtering depend on the deposition temperature. Films deposited at a low temperature have low oxygen content. The poor superconducting properties of these films may be due to the oxygen deficiency. The stoichiometry of the films deposited by the dc-template sputtering method was found to depend on the microstructure of the template. The disorder at the Ba and O sublattices of these highly crystallinea-axis films are uncorrelated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00727500
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