GLORIA

GEOMAR Library Ocean Research Information Access

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Online Resource
    Online Resource
    Acoustical Society of America (ASA) ; 2008
    In:  The Journal of the Acoustical Society of America Vol. 123, No. 5_Supplement ( 2008-05-01), p. 3641-3641
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 123, No. 5_Supplement ( 2008-05-01), p. 3641-3641
    Abstract: In photoacoustic imaging applications an image is reconstructed of the optical absorption distribution the imaged object. The photoacoustic measurements however are also dependent on acoustic properties of the imaged object. By estimating the acoustic properties from photoacoustic measurements, we can improve the performance of the optical absorption reconstruction and allow for the imaging of separate acoustic modalities. We derive and evaluate a maximum likelihood estimator for the measurements of integrated acoustic attenuation. This estimator is applicable to media like soft tissue. In this kind of media, the attenuation due to dissipative effects obeys a frequency power law. By measuring the propagation of ultrasound signals through such a medium, the parameters that describe the attenuation can be estimated. In this paper a new method is introduced for estimating the attenuation of ultrasound media by means of transmission mode measurements. The method is based on analyzing the noise characteristics of the received signals and the formulation of a maximum likelihood estimator. The new estimator is compared to existing methods and was found to be a better estimator in terms of the RMS error than previous methods.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    RVK:
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2008
    detail.hit.zdb_id: 1461063-2
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 2
    Online Resource
    Online Resource
    SAGE Publications ; 2014
    In:  American Sociological Review Vol. 79, No. 3 ( 2014-06), p. 549-574
    In: American Sociological Review, SAGE Publications, Vol. 79, No. 3 ( 2014-06), p. 549-574
    Abstract: The modernization thesis claims that intergenerational social mobility increased over time due to industrialization and other modernization processes. Here, we test whether this is indeed the case. We study approximately 360,000 brothers from 189,000 families covering more than 500 municipalities in the Netherlands and a 70-year period (1827 to 1897). We complement these sibling- and family-level data with municipal indicators for the degree of industrialization, mass communication, urbanization, educational expansion, geographic mobility, and mass transportation. We analyze these data by applying sibling models, that is, multilevel regression models where brothers are nested in families, which in turn are nested in communities. We find that the total—unmeasured—family effect on sons’ status attainment decreases slightly and is higher than that found for contemporary societies. The measured influence of the family, operationalized by father’s occupational status, decreased gradually in the Netherlands in the second half of the nineteenth century. A substantial part of this decrease was due to some, but not all, of the modernization processes adduced by the modernization thesis.
    Type of Medium: Online Resource
    ISSN: 0003-1224 , 1939-8271
    RVK:
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2014
    detail.hit.zdb_id: 203405-0
    detail.hit.zdb_id: 2010058-9
    SSG: 2,1
    SSG: 3,4
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...