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  • Digitale Medien  (10)
  • 1985-1989  (3)
  • 1980-1984  (4)
  • 1955-1959  (2)
  • 1950-1954  (1)
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Materialart
  • Digitale Medien  (10)
Erscheinungszeitraum
Jahr
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    Photocycloadducts of dimethylmaleic anhydride with unsaturated acids and esters (1988)
    s.l. : American Chemical Society
    The @journal of organic chemistry 53 (1988), S. 2624-2629 
    Details
    ISSN: 1520-6904
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/jo00246a045
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  • 2
    Digitale Medien
    Digitale Medien
    Impedance and modulus spectroscopy of semiconducting BaTiO3 showing positive temperature coefficient of resistance (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 3850-3856 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Polycrystalline barium titanate that has been doped to give a positive temperature coefficient of resistance (PTCR) effect is an inhomogeneous material electrically. Analysis of ac impedance data using the complex impedance plane representation gives the dc resistance of PTCR ceramics. By additional use of the complex electric modulus formalism to analyze the same data, the inhomogeneous nature of the ceramics may be probed. This reveals the presence of two, sometimes three elements in the equivalent circuit. Grain-boundary and bulk effects may be distinguished from capacitance data: grain-boundary effects have temperature-independent capacitances, whereas bulk effects show a capacitance maximum at the Curie point and Curie–Weiss behavior above the Curie point. Both grain-boundary and bulk effects appear to contribute to the PTCR effect. These results reveal limitations in current theories of the PTCR effect.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.344049
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  • 3
    Digitale Medien
    Digitale Medien
    Absence of Shock Hazard with Certain Multigap Spark Circuits (1956)
    [s.l.] : Nature Publishing Group
    Nature 177 (1956), S. 1175-1176 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The experiments to be described were carried out with spark circuits of a type and power-level widely used in spectrographic analysis. In each of the circuits shown, Gx represents the control gap determining the striking voltage, while Gz represents the analysis gap which, for convenience in ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/1771175a0
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  • 4
    Digitale Medien
    Digitale Medien
    Sporidesmium bakeri and Facial Eczema of Sheep in the Field (1959)
    [s.l.] : Nature Publishing Group
    Nature 184 (1959), S. 1327-1328 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] At the Manutuke Research Station, Gisborne, a facial eczema research farm of the New Zealand Department of Agriculture, two, 1-acre fields (No. 20 and No. 31), of perennial rye grass, white clover have been closely mown, at 7 14 day intervals, with motor lawn-mowers since the spring flush of ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/1841327b0
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  • 5
    Digitale Medien
    Digitale Medien
    Elastic scattering of20Ne on24Mg (1983)
    Springer
    The European physical journal 311 (1983), S. 297-302 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Elastic scattering of20Ne on24Mg was studied at an incident20Ne energy of 40 MeV. Scattered20Ne and24Mg nuclei were observed in coincidence with a standard surface barrier and a position sensitive detector. The measured angular distribution shows periodic oscillations which are identified with the24Mg(20Ne,24Mg)20Ne reaction. Taking interference between elastic scattering and transfer into account, anα-spectroscopic factor ofS=0.08±0.02 was deduced from the amplitude of the oscillations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01415684
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  • 6
    Digitale Medien
    Digitale Medien
    The anatomy of pain sensibility (1953)
    Springer
    Journal of neural transmission 7 (1953), S. 135-146 
    Details
    ISSN: 1435-1463
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01227053
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  • 7
    Digitale Medien
    Digitale Medien
    Production of superoxide by neutrophils (1983)
    Springer
    Cellular and molecular life sciences 39 (1983), S. 61-62 
    Details
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Oxygen uptake by neutrophils has been stimulated by particulate serum-treated-zymosan (STZ) and soluble N-formylmethionyl-leucyl-phenylalanine (FMLP) in the presence and absence of the superoxide radical scavenger, cytochrome C. Results indicate that FMLP may stimulate neutrophils to produce superoxide but that STZ may not.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01960628
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  • 8
    Digitale Medien
    Digitale Medien
    Scanned image microscopy (1980)
    [s.l.] : Nature Publishing Group
    Nature 287 (1980), S. 580-582 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] A recent conference* showed that new types of scanning microscope which promise unique imaging capabilities are rapidly being developed. As well as improved optical microscopes, X rays and acoustic waves are being used for high resolution scanned imaging and energy conversion techniques are ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/287580a0
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  • 9
    Digitale Medien
    Digitale Medien
    Interior imaging using spatial frequency sampling (1981)
    Springer
    Journal of nondestructive evaluation 2 (1981), S. 203-207 
    Details
    ISSN: 1573-4862
    Schlagwort(e): ultrasonics ; synthetic aperture ; spatial frequency ; interior imaging ; acoustic microscopy ; defect detection ; NDE
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Mathematik
    Notizen: Abstract A new acoustic synthetic aperture geometry is demonstrated in which the image field is sampled in the spatial frequency domain. This means the sampled field is recorded in a particularly convenient form for presentation to the back propagation algorithms used to reconstruct the field at the object plane. The method has applications in interior visualization. It is difficult to image the interior of solid objects using lens based imaging systems because a different lens geometry must be used for each distinct object material. The system presented here overcomes such problems since both the angular variation of the transmission coefficient at the object-water interface and the aberrations introduced by the velocity mismatch at the object surface may be readily compensated for in the back propagation routine. Experimental results are presented illustrating the detection of four half wavelength diameter defects, spaced by three wavelengths, at a depth of eight wavelengths below the surface of an aluminum block.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00570732
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  • 10
    Digitale Medien
    Digitale Medien
    BulkPTC effect on doped BaTiO3 (1988)
    Springer
    Journal of materials science 7 (1988), S. 823-824 
    Details
    ISSN: 1573-4811
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00723773
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