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  • Springer  (109)
  • Wiley  (17)
  • Blackwell Publishing Ltd  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Evaluation of instationary flow fields using crosscorrelation in image sequences (1996)
    Springer
    Experiments in fluids 20 (1996), S. 210-217 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In order to investigate the temporal behavior of dynamic flow processes, a movie version of particle image velocimetry (PIV) with a high framing capability has been developed. The experimental setup includes a copper vapor laser capable to produce pulse sequences with more than 100 pulses with a repetition rate of up to 30 kHz and a rotating drum camera to record the Mie scattering signals from the particles seeded to the flow. With this setup, image sequences with a number of consecutive images (40–70 depending on the image size) of a dynamic process can be taken on high resolution 36 mm film. To evaluate the 2-dimensional velocity vector fields, an algorithm based on the crosscorrelation of subareas in consecutive images has been developed and optimized in terms of computing time. The technique was applied to resolve the instationary flow field in a single cylinder spark ignition (SI) engine during the compression stroke.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00190276
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  • 2
    Electronic Resource
    Electronic Resource
    The composition analysis of YBa2Cu3O7-δ or PrBa2Cu3O7-δ thin films and (YBa2Cu3O7-δ/PrBa2Cu3O7-δ)n heterostructures prepared by CVD (1997)
    Springer
    Fresenius' journal of analytical chemistry 357 (1997), S. 1061-1065 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Some YBa2Cu3O7-δ films and heterostructures prepared by Chemical Vapor Deposition (CVD) were analyzed in our laboratories by EPMA-EDX or WDX, RBS, SNMS and AES. It was found that in some cases the results of composition analysis can significantly deviate from each other. At least two main reasons for these deviations exist: the different lateral resolution and the application of different reference samples for the calibration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050305
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  • 3
    Electronic Resource
    Electronic Resource
    Isolation, Purification, and Characterization of Lipase Isoenzymes from a Technical Aspergillus niger Enzyme (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 50 (1985), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A qualitative screening revealed the occurrence of lipase, esterase, protease, amylase, endo-1,4-β-D-glucanase, xylanase, pectinmethylesterase, polygalacturonase, catalase, β-D-glucosidase and β-D-galactosidase activities in the technical Aspergillus niger enzyme under study (Lipase 2212 D, Röhm). The isolation and purification of lipolytic activities were performed by combination of DEAE-Trisacryl M ion exchange chromatography, Sephadex G 50 gel filtration and hydrophobic chromatography using Phenylsepharose CL-4B. The individual purification steps were checked by specific enzyme visualization in ultrathin agar gels after ultrathin-layer isoelectric focusing (UIEF). Two UIEF homogeneous lipase isoenzymes (I and II) were isolated and characterized by the following parameters: isoelectric points (I: 4.0; II. 3.5); molecular weights (I: 31000 daltons; II: 19000 daltons); carbohydrate contents (I: 6%; II: 9%) and compositions; pH optima (I, II: 5-6); substrate specificities and various effectors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1985.tb10574.x
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  • 4
    Electronic Resource
    Electronic Resource
    Fecundity of whitefish (Coregonus lavaretus) during the eu-and oligotrophication of Lake Constance (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 43 (1993), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: About 20 ovaries of the whitefish ‘Blaufelchen’ (Coregonus lavaretus L.) of Lake Constance (Bodensee) were collected annually from 1964-1991. Absolute and relative fecundity peaked in the early 1980s, lagging about 2 years behind the maximum of total-P in the water (during the circulation period). Out of the biological time-series of Lake Constance, whitefish fecundity is the only one known to follow the phosphorus curve, and this may be the first time-series documented case of parallel trend reversal in the trophic state of a lake and fish biology. It is concluded that fish fecundity serves, at best, as an unspecific monitor of the overall well-being of the fish.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1993.tb00412.x
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  • 5
    Electronic Resource
    Electronic Resource
    Crustal structure of the Lofoten continental margin, off northern Norway, from ocean-bottom seismographic studies (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 121 (1995), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: In 1988, an extensive geophysical experiment was performed on the Lofoten passive continental margin, which was formed by the continental break-up between Greenland and northern Norway at 58 Ma. The geological units of the outer Lofoten margin are characterized by seaward-dipping reflectors (SDRs) and landward flood basalt, which extends up to 100 km landwards of SDRs. In this study, we obtain the P-wave velocity structure beneath the Lofoten Basin, the SDRs, and the landward flood basalt by use of ocean-bottom seismograph refraction profiling, and we also discuss the formation of the northern Norwegian passive continental margin.In the Lofoten Basin the crust is of oceanic type, consisting of sedimentary layers, oceanic laver 2 (4.9−5.5 km s−1), layer 3A (6.3−6.8 km s−1) and layer 3B (7.0−7.1 km s−1). Beneath the SDRs the crustal layers are identical to those of the Lofoten Basin, but the thickness of the lower crust, which represents the same velocity as layer 3B, increases to 5 km towards the continent side, and a high-velocity lower crustal layer (7.3 km s−1) is formed at the base of the crust. The ocean-continent transition zone is situated between the landward side of the SDRs and the northward continuation of the Vøring Plateau Escarpment. In this region the velocity of the lower crust gradually decreases and approaches the lower crustal velocity beneath the Lofoten Islands (6.8 km s−1). The model also indicates that the high-velocity layer disappears in this region. Comparing our model with the crustal structure on the Vøring margin, it is clear that the lower crustal body (≥7 km s−1) thickens southwards along the northern Norwegian continental margin. Recent results from petrological and geophysical studies of the generation of the oceanic crust have shown that increasing the temperature of the upwelling asthenospheric material increases the thickness of the oceanic crust. We interpret this as that the oceanic crust in the southern area in the Vøring-Lofoten margin was generated by hotter material than that of the northern area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1995.tb06447.x
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  • 6
    Electronic Resource
    Electronic Resource
    Distribution of parvalbumin isotypes in adult snook and their potential applications as species-specific biomarkers (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 51 (1997), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The highly stable Ca2+ binding protein, parvalbumin, is prevalent in fish white muscle tissue. The properties of this protein make it a promising antigen for use as a specific biomarker for fish identification. Parvalbumin was purified from white muscle of an adult common snook Centropomus undecimalis using ammonium sulfate precipitation, size-exclusion chromatography (SEC) and anion-exchange HPLC. Parvalbumins were characterized by the presence of an 11-kDa band following gradient-SDS gel electrophoresis and by their immunoreactivity against mouse anti-parvalbumin antibodies. Anion-exchange chromatography of the parvalbumin fraction separated from the SEC column yielded nine fractions. Subsequent analysis of these fractions by isoelectric focusing gel electrophoresis led to a total of seven parvalbumin isotypes, which may lend themselves as biomarkers in fish identification. The presence of these seven parvalbumin isotypes was confirmed independently by reversed-phase HPLC. A dilution endpoint immunoassay was developed for C. undecimalis parvalbumin using a monoclonal antibody directed against its highly conserved calcium binding site. The utility of parvalbumin isotype distribution and specific monoclonal antibodies against fish parvalbumin in species identification is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1997.tb01512.x
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  • 7
    Electronic Resource
    Electronic Resource
    Stochastisches PERT — Eine vergleichende Untersuchung über die Effizienz eines Verfahrens zur stochastischen Projektplanung (1984)
    Springer
    Mathematical methods of operations research 28 (1984), S. B59 
    Details
    ISSN: 1432-5217
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Summary A method of project scheduling with stochastic networks is shown in a discrete version. It yields an upper bound for the expected delay of a given project completion time. The numerical complexity of the implemented procedure is given. By means of two examples the results of the numerical implementation are summarized. The accuracy and practicability can be seen by comparing these results to those of an exact solution and a PERT-solution.
    Notes: Zusammenfassung Es wird ein Verfahren der Projektplanung mit Hilfe von stochastisch bewerteten Netzplänen vorgestellt. Dieses Verfahren berechnet eine obere Schranke für den Erwartungswert der Überschreitung eines Projektendterminst. Anhand zweier Beispiele werden die Ergebnisse aus einer numerischen Implementation des Verfahrens zusammengefaßt und Anhaltspunkte zur Genauigkeit, Effizienz und praktischen Anwendbarkeit — durch einen Vergleich mit einer exakten Lösung und durch eine Gegenüberstellung mit PERT gegeben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01917548
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  • 8
    Electronic Resource
    Electronic Resource
    Divergent distributions of prey and predator, a fishing effect? (1995)
    Springer
    Aquatic sciences 57 (1995), S. 106-118 
    Details
    ISSN: 1420-9055
    Keywords: Benthos ; fish ; vertical distribution ; predation risk ; selective fishing ; Lake Constance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract To compare the vertical distributions of benthos and fish species of Upper Lake Constance (Bodensee), 552 benthos samples were taken with an Auerbach grab at four transects (10–250 m). An additional 54 samples (1–10 m) were collected elsewhere. Complementary data was taken from the literature. In winter, most fish feed on benthos, mainly chironomids, but in summer less than 5% do so. Formerly the bottom gill-netting aimed mainly at catchingCoregonus pidschian, but it now aims atPerca fluviatilis. Contrary to expectation, in winter the greatest abundance ofP. fluviatilis is much deeper (55 m) than that of its preferred food, i.e. chironomids (〈20 m). Comparably,C. pidschian also stayed deeper than its main food source (chironomids and mollusks).Lota lota, Salvelinus profundus andS. alpinus — unlike the unwanted cyprinids — also stay or stayed deeper than the attractive chironomids. It is argued that the fish reduce their “predation risk”, i.e. the risk of being gillnetted in the upper 50 m, by “selecting” the deeper less dangerous, but also less food-abundant habitat. Balancing predation risk against food abundance may have led to “survival of the deepest”.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00877379
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  • 9
    Electronic Resource
    Electronic Resource
    Zur Ermittlung der Viskositäts-Molekulargewichtsbeziehung bei strukturviskosen Lösungen Hochpolymerer (1954)
    Springer
    Naturwissenschaften 41 (1954), S. 526-526 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00623044
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  • 10
    Electronic Resource
    Electronic Resource
    Über kristallisierte Pyridin-Amylose aus natürlicher Kartoffelstärke (1934)
    Springer
    Naturwissenschaften 22 (1934), S. 451-452 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01497689
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