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  • 1
    Electronic Resource
    Electronic Resource
    Brain death: practicability of evoked potentials (1992)
    Springer
    Neurosurgical review 15 (1992), S. 249-254 
    Details
    ISSN: 1437-2320
    Keywords: Brain death ; evoked potentials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Multimodally evoked potentials were registered in 85 patients who fulfilled the criteria for brain death. While samatosensory and visual evoked potentials have been found to be of limited value for the diagnosis of brain death, the stepwise abolition of brain stem auditory evoked potentials (BAEP) confirmed brain death in 26 out of 85 patients, i. e. 31%. Registration of the abolition of BAEP is concluded to be a safe and acceptable confirmatory test. It is, however, more feasible for institutions, in which BAEP are analysed routinely. In spite of all efforts sequential BAEP could not be used for the diagnosis of brain death in the majority of cases either because of absence of reproducible responses at the initial registration or because the patient was already apnoic at the time of the initial BAEP. Assuming that bilateral preservation of wave I has the same significance as the stepwise abolition of BAEP, since it also proves the integrity of the peripheral receptor, BAEP are relevant for the declaration of brain death in approximately 30% of patients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00257800
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  • 2
    Electronic Resource
    Electronic Resource
    Untersuchungen über die Ermüdungen des Sehens an Gesunden und Nervenkranken (1937)
    Springer
    Journal of neurology 144 (1937), S. 141-159 
    Details
    ISSN: 1432-1459
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung 1. Es wird eine Versuchsanordnung beschrieben, mit der es gelingt, die Schwankungen der Lichtempfindlichkeit über längere Zeit im Dunkelversuch zu messen. 2. Es sind kurzfristige Versuche zur Erfassung der Änderung ungeeignet. Versuche über 1/2 Stunde mit minutlicher Ablesung sind am günstigsten. 3. Man findet normal eine geringe Schwankungsbreite der Empfindlichkeit. Sie beträgt in unseren Versuchen bis zum Doppelten der tiefsten Schwelle. 4. Bei körperlicher Ermüdung erhöht sich die Schwankungsbreite wenig. 5. Bei 30 untersuchten Nervenkranken findet sich teilweise eine viel stärkere Schwankung der Lichtempfindlichkeit. Sie kann bis zum 40fachen des tiefsten Punktes ansteigen. 6. Es gelingt mit dem Verfahren nicht, die Lokalisation der Ermüdung anzugeben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01761896
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Comparison of Computational Crack Path Predictions with Experimental Findings for a Quarter-Circular Surface Crack in a Shaft under Torsion (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 348-349 (Sept. 2007), p. 161-164 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper the rather complex 3D fatigue crack growth behaviour in a shaft with aquarter-circular crack under torsion is investigated by the aid of the programme ADAPCRACK3Dand by application of a recently developed 3D fracture criterion. It will be shown that thecomputationally simulated results of fatigue crack growth in the FE-model of the shaft are in goodagreement with experimental findings for the development of two anti-symmetric cracks, whichoriginate from the two crack front corner points, that is where the crack front intersects the freesurface of the cylindrical laboratory test-specimens. Consequently, also for this case with a rathercomplex 3D crack growth of two anti-symmetric cracks, the functionality of the ADAPCRACK3Dprogrammeand the validity of the proposed 3D fracture criterion can be stated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.348-349.161.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Comparison of DBEM and FEM Crack Path Predictions with Experimental Findings for a SEN-Specimen under Anti-Plane Shear Loading (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 348-349 (Sept. 2007), p. 129-132 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper detailed results of computational 3D fatigue crack growth simulations willbe presented. The simulations for the crack path assessment are based on the DBEM code BEASY,and the FEM code ADAPCRACK 3D. The specimen under investigation is a SEN-specimensubject to pure anti-plane or out-of-plane four-point shear loading. The computational 3D fractureanalyses deliver variable mixed mode II and III conditions along the crack front. Special interest istaken in this mode coupling effect to be found in stress intensity factor (SIF) results along the crackfront. Further interest is taken in a 3D effect which is effective in particular at and adjacent to thetwo crack front corner points, that is where the crack front intersects the two free side surfaces ofthe specimen. Exactly at these crack front corner points fatigue crack growth initiates in theexperimental laboratory test specimens, and develops into two separate anti-symmetric cracks withcomplex shapes, somehow similar to bird wings. The computational DBEM results are found to bein good agreement with these experimental findings and with FEM results previously obtained.Consequently, also for this new case, with complex 3D crack growth behaviour of two cracks, thefunctionality of the proposed DBEM and FEM approaches can be stated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.348-349.129.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Fatigue Crack Growth Simulations and Experimental Findings for SEN-Specimens under Different Loadings (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 55-60 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper the rather complex 3D fatigue crack growth behaviour in a SEN-specimensunder anti-plane shear or torsion loading is investigated by the aid of the programmeADAPCRACK3D and by application of a recently developed 3D fracture criterion. It will be shownthat the computationally simulated results of fatigue crack growth in the FE-models of thespecimens are in good agreement with experimental findings for the development of two antisymmetriccracks, which originate from the two crack front corner points, that is where the crackfront intersects the free surfaces of the laboratory SEN test-specimens. Consequently, also for thesecases with a rather complex 3D crack growth of two anti-symmetric cracks, the functionality of theADAPCRACK3D-programme and the validity of the proposed 3D fracture criterion can be stated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.55.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    2D- and 3D-Mixed Mode Fracture Criteria (2003)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 251-252 (Oct. 2003), p. 251-260 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/47/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.251-252.251.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Computational Fracture Analyses of a Compact Tension Shear (CTS) Specimen with an Inclined Crack Plane (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 385-387 (July 2008), p. 741-744 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper some results of 3D-finite element analyses of a modified CTS-specimenwith an inclined crack plane are presented. It will be shown, that through the inclination of the crackplane, even under pure tension loading of the specimen, a superposition of all fracture modes I, IIand III can be generated along the straight crack front of the inclined crack plane. Furthermore,mixed-mode I, II and III loading conditions can also be generated if this modified CTS-specimen issubject to an in-plane tension/shear loading. The computational fracture analysis is based on thecalculation of separated energy release rates GI, GII and GIII along the crack front by thenumerically highly effective modified virtual crack closure integral(MVCCI)-method and for thefinite element(FE)-modelling the commercially available FE-code ANSYS is utilized
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.385-387.741.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Computational Simulation and Experimental Results on 3D Crack Growth in a 3PB-Specimen with an Inclined Crack Plane (2003)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 251-252 (Oct. 2003), p. 85-90 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/47/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.251-252.85.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    A laboratory study on digestive processes in the Antarctic krill, Euphausia superba, with special regard to chitinolytic enzymes (1999)
    Springer
    Polar biology 21 (1999), S. 295-304 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Feeding experiments of 9, 14 and 20 days duration were carried out on the Antarctic krill, Euphausia superba. Two groups were fed with the chitinous diatom Cyclotella cryptica and the non-chitinous green algae Dunaliella bioculata, respectively. A control group remained unfed. The time courses of the activities of endo- and exochitinase in the stomach and the midgut gland were compared with those of the digestive enzymes protease, cellulase (1,4-β-d-glucanase) and laminarinase (1,3-β-d-glucanase). Specific activities of all enzymes were higher in the stomach than in the midgut gland. Characteristic time courses of activity were evident after 4 days. In starved animals, enzyme activities decreased to a minimum after 4 days and recovered within 14 days to initial values. In the stomach, the activities of endo- and exochitinase increased when krill were fed on Cyclotella. For animals fed with Dunaliella, activities stayed constant or decreased slightly. The results confirm chitinases as digestive enzymes and, therefore, the capability of krill to utilize various food sources.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003000050365
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Partial characterization of chitin degrading enzymes from two euphausiids, Euphausia superba and Meganyctiphanes norvegica (1988)
    Springer
    Polar biology 9 (1988), S. 115-122 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Chitinase and N-acetyl-β-D-glucosaminidase have been demonstrated in Meganyctiphanes norvegica and in Euphausia superba and partly characterized. The enzymes from both species have broad pH-optima (maxima around pH 5.0) and temperature optima between 40 and 50°C. The enzymes are relatively stable; even at about 45°C half of the enzyme activity is retained after 30 min incubation. The presence of fluoride does not affeet enzymatic activity. Chitinase activity appears in three different molecular masses, N-acetyl-β-D-glucosaminidases in two different forms. pH and temperature optima, thermal stability and kinetic properties of the two enzymes are strikingly similar in the polar E. superba versus the boreal euphausiid M. norvegica. Enzyme activity in the lower temperature range is still high, whereas activation energies are low in both euphausiids. This suggests a functional adaptation to a low temperature range in seawater.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00442038
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