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  • 1
    Electronic Resource
    Electronic Resource
    Terrestrial carbon-isotope records from coastal deposits (Algarve, Portugal): a tool for chemostratigraphic correlation on an intrabasinal and global scale (2003)
    Oxford, UK : Blackwell Science Ltd
    Terra nova 15 (2003), S. 0 
    Details
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The carbon-isotope signature of terrestrial organic matter (OM) offers a valuable tool to develop stratigraphic correlations for near-shore deposits. A mid-Cretaceous coastal succession of the western Algarve Basin, Portugal, displays a marked negative δ13C excursion ranging from − 21.2‰ to − 27.8‰ in the Early Aptian followed by two shifts towards higher values (up to − 19.3‰) during the Early and Late Aptian, respectively. The dominance of cuticle and leaf debris in the bulk OM fraction is confirmed by optical studies, Rock-Eval pyrolysis and by comparison with the δ13C signature of four different types of fossilized land-plant particles. Correlation of two terrestrial δ13Cbulk OM records from different study sites leads to a significant enhancement of the intrabasinal stratigraphic correlation within the Algarve Basin. Three prominent excursions in the Portuguese records can be correlated with existing δ13C curves from pelagic and terrestrial environments. The general carbon-isotope pattern is superimposed by small-scale fluctuations which can be explained by compositional variations within the OM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3121.2003.00447.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A general transposition method for a matrix on auxiliary store (1990)
    Springer
    BIT 30 (1990), S. 2-16 
    Details
    ISSN: 1572-9125
    Keywords: E.2 ; F.2.1 ; G.4 ; I.1.2 ; Matrix transposition ; mixed radix notation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract An algorithm is developed and described for transposing a matrix larger than available working storage. If an (n×m)-matrix is stored in row-major order, and blocks ofn elements may be transferred to and from working storage at a time, the algorithm needsw=(5[m/n]+8)·n elements to be present in working storage at a time and requires [log2(2mn/w)] passages over the matrix. The algorithm is as efficient as earlier methods but needs no extra backing storage space. An algebra for mixed radix notation and a generalization of mixed radix notation is introduced for the description and verification of transposition algorithms, and earlier algorithms are briefly certified or disproved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01932126
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Invariant fundamental solutions and solvability for symmetric spaces of typeG C/G R with only one conjugacy class of Cartan subspaces (1998)
    Springer
    Arkiv för matematik 36 (1998), S. 191-200 
    Details
    ISSN: 1871-2487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02384765
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    Paper (German National Licenses)
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  • 4
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    Validation of sick leave measures: self-reported sick leave and sickness benefit data from a Danish national register compared to multiple workplace-registered sick leave spells in a Danish municipality (2012)
    BioMed Central
    Details
    Publication Date: 2012-08-16
    Description: Background: Previous validation studies of sick leave measures have focused on self-reports. Register-based sick leave data are considered to be valid; however methodological problems may be associated with such data. A Danish national register on sickness benefit (DREAM) has been widely used in sick leave research. On the basis of sick leave records from 3,554 and 2,311 eldercare workers in 14 different workplaces, the aim of this study was to: 1) validate registered sickness benefit data from DREAM against workplace-registered sick leave spells of at least 15 days; 2) validate self-reported sick leave days during one year against workplace-registered sick leave. Methods: Agreement between workplace-registered sick leave and DREAM-registered sickness benefit was reported as sensitivities, specificities and positive predictive values. A receiver-operating characteristic curve and a Bland-Altman plot were used to study the concordance with sick leave duration of the first spell. By means of an analysis of agreement between self-reported and workplace-registered sick leave sensitivity and specificity was calculated. Ninety-five percent confidence intervals (95% CI) were used. Results: The probability that registered DREAM data on sickness benefit agrees with workplace-registered sick leave of at least 15 days was 96.7% (95% CI: 95.6-97.6). Specificity was close to 100% (95% CI: 98.3-100). The registered DREAM data on sickness benefit overestimated the duration of sick leave spells by an average of 1.4 (SD: 3.9) weeks. Separate analysis on pregnancy-related sick leave revealed a maximum sensitivity of 20% (95% CI: 4.3-48.1).The sensitivity of self-reporting at least one or at least 56 sick leave day/s was 94.5 (95% CI: 93.4 -- 95.5) % and 58.5 (95% CI: 51.1 -- 65.6) % respectively. The corresponding specificities were 85.3 (95% CI: 81.4 -- 88.6) % and 98.9 (95% CI: 98.3 -- 99.3) %. Conclusions: The DREAM register offered valid measures of sick leave spells of at least 15 days among eldercare employees. Pregnancy-related sick leave should be excluded in studies planning to use DREAM data on sickness benefit. Self-reported sick leave became more imprecise when number of absence days increased, but the sensitivity and specificity were acceptable for lengths not exceeding one week.
    Electronic ISSN: 1471-2458
    Topics: Medicine
    Published by BioMed Central
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  • 5
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    Clonidine in the treatment of adolescent chronic fatigue syndrome: a pilot study for the NorCAPITAL trial (2012)
    BioMed Central
    Details
    Publication Date: 2012-08-08
    Description: Background: This pilot study (ClinicalTrials.gov ID: NCT01507701) assessed the feasibility and safety of clonidine in adolescent chronic fatigue syndrome (CFS). Specifically, we assessed clonidine dosage in relation to a) plasma concentration levels, b) orthostatic cardiovascular responses, and c) possible adverse effects.FindingsFive adolescent CFS patients (14-19 years old) received 50 mug clonidine twice per day during 14 days in an open, uncontrolled design. Plasma concentration of clonidine was assayed by standard laboratory methods. Changes in orthostatic cardiovascular responses were assessed by a 20o head-up tilt-test (HUT). Adverse effects were mapped by a questionnaire.After 14 days, C0 median (range) of clonidine was 0.21 (0.18-0.36) mug/L, and Cmax median (range) of clonidine was 0.41 (0.38-0.56) mug/L. Also, supine blood pressures and heart rate were lower during clonidine treatment, and the HUT response was closer to the normal response. No serious adverse effects were registered. Conclusion: Clonidine 50 mug BID seems to be safe enough to proceed from a pilot study to a controlled trial in a select group of adolescents with CFS (ClinicalTrials.gov ID: NCT01040429).
    Electronic ISSN: 1756-0500
    Topics: Biology , Medicine
    Published by BioMed Central
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  • 6
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    Effect of early Pliocene uplift on late Pliocene cooling in the Arctic–Atlantic gateway (2014)
    In:  EPIC3Earth and Planetary Science Letters, 387, pp. 132-144, ISSN: 0012-821X
    Details
    Publication Date: 2015-10-03
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 7
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    The Arctic Shelf Regions as a Source of Freshwater and Brine-Enriched Waters as Revealed from Stable Oxygen Isotopes (2011)
    Alfred Wegener Institute for Polar and Marine Research & German Society of Polar Research
    In:  EPIC3Polarforschung, Bremerhaven, Alfred Wegener Institute for Polar and Marine Research & German Society of Polar Research, 80(3), pp. 127-140, ISSN: 0032-2490
    Details
    Publication Date: 2019-07-17
    Description: The water masses of the Arctic Ocean shelf regions are significantly influenced by river water and sea-ice processes. Since river water is highly depleted in ∂18O relative to marine waters as well as to sea-ice, the ∂18O composition and salinity of a water sample can be used to separate the different freshwater water sources. In this paper the distributions of river water, sea-ice melt water or sea-ice formation are discussed for the Kara, Laptev and Beaufort shelves based on ∂18O and salinity data. Depending on the average depth the observed fields of salinity and ∂18O values are different for each region. But comparing the overall ∂18O and salinity correlations reveals a remarkable similarity for these three Arctic shelf regions as similar local bottom-water masses are formed by sea-ice processes. Remnants of these seaice derived bottom water masses are found on all shelves during summer at a salinity of about 30. Investigations at the shelf break of the Kara Sea and Laptev Sea show that river water as well as brine waters are exported to the Arctic Ocean halocline. This export shows inter-annual variability in correlation with wind forcing during summer.
    Repository Name: EPIC Alfred Wegener Institut
    Type: "Polarforschung" , peerRev
    Format: application/pdf
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