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  • 1
    ISSN: 1432-2307
    Schlagwort(e): Autopsy frequency ; Selection factors ; Stomach-colon-rectum cancer ; Lung-cancer ; Incidences
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary A method for determining the incidence of malignancies of the stomach, colon, rectum, and lungs has been based on the frequency of the tumors in the autopsy material of the Institute of Pathology of the University of Heidelberg for the period 1900 to 1975. The main goal of this model is time independent selection of autopsy material indicated by an almost constant pattern for sex, average age at death, number of inhabitants, and number of autopsies. There is a relationship between incidence and autopsy frequency only when coding the diagnoses independently of their contributions to the cause of death. The results show a nearly constant incidence of stomach cancer, a steady incidence of colon and rectal cancer which, however, differs for men and women, and a large increase in the incidence of lung cancer.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Surveys in geophysics 17 (1996), S. 347-360 
    ISSN: 1573-0956
    Schlagwort(e): Ultrasonic waves ; Attenuation ; Velocity ; Microstructure ; Thermal cracking ; Local fluid flow
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract The frequency dependent mechanism of local fluid flow was found to be the decisive absorption and dispersion mechanism in fluid containing sandstones. In the ultrasonic frequency range local fluid flow and grain surface effects control the behaviour of highly porous and highly permeable rock if a pore fluid is present. Both mechanisms depend less on macroscopic rock parameters like porosity and permeability than essentially on microscopic parameters like crack size, crack density and grain contact properties. To demonstrate directly the important influence of the microstructure on the rock elastic and anelastic properties the microstructure of a sandstone was artificially changed by thermal cracking. The cracked rock exhibits a clearly changed behaviour at low uniaxial as well as at high hydrostatic pressure despite small changes of porosity and permeability. Fluid effects increase due to cracking. The experimental results are explained by means of a rock, model and local fluid flow. These results emphasize that it is the microstructure which controls the elastic and anelastic rock behaviour, even at high hydrostatic pressure.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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