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  • Copernicus  (192)
  • Springer  (56)
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  • 1
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    Amorphous chalcogenide AgSbS2 films prepared by pulsed laser deposition (2004)
    Springer
    Details
    Publication Date: 2004-09-01
    Print ISSN: 0947-8396
    Electronic ISSN: 1432-0630
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Far-field and near-field material processing with. femtosecond laser pulses (1999)
    Springer
    Applied physics 69 (1999), S. S7 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 42.62.-b; 42.65.Re; 81.65.Cf
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Recently, it has been proven that femtosecond lasers are ideal tools for the microstructuring of solid targets. Since thermal and mechanical influences are minimized, diffraction-limited structures can be generated in the far field. The diffraction limit can be overcome when one works in the near field. In this paper, concrete applications and new developments in both regimes are highlighted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003399900391
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  • 3
    Electronic Resource
    Electronic Resource
    Optical characterization of thermally evaporated thin films of As40S40Se20 chalcogenide glass by reflectance measurements (1998)
    Springer
    Applied physics 67 (1998), S. 371-378 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 78.20.Ci; 78.66.Jg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: 40 S40Se20, deposited by thermal evaporation, were obtained in the 400 nm to 2200 nm spectral region. The optical constants of this amorphous material were computed using an optical characterization method based mainly on the ideas of Minkov and Swanepoel of utilising the upper and lower envelopes of the spectrum, which allows us to obtain both the real and imaginary parts of the complex refractive index, and the film thickness. Thickness measurements made by a surface-profiling stylus have been carried out to cross-check the results obtained by the optical method. The dispersion of the refractive index is discussed in terms of the single-oscillator Wemple–DiDomenico model. The optical band gap has been determined from absorption coefficient data by Tauc’s procedure. Finally, the photo-induced and thermally induced changes in the optical properties of a-As40S40Se20 thin films were also studied, using both transmission and reflection spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050787
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  • 4
    Electronic Resource
    Electronic Resource
    Depositional regimes in the Norwegian-Greenland Sea: the last two glacial to interglacial transitions (1995)
    Springer
    International journal of earth sciences 84 (1995), S. 28-48 
    Details
    ISSN: 1437-3262
    Keywords: Norwegian ; Greenland Sea Glacial cycles ; Depositional regimes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Various models of surface and deep-water circulation in the Norwegian-Greenland Sea (NGS) have been proposed for the last two glacial to interglacial transitions. Although much progress has been made in understanding the sedimentary response to climatic and oceanographic changes, conflicting interpretations have been developed. To clarify some of these discrepancies and to test or modify the existing circulation concepts, a multiparameter approach is applied, combining sedimentological, micropaleontological, organic-geochemical and isotopic methods. On the basis of indicative properties a combined litho- and organofacies concept is developed and calibrated with modern depositional settings beneath different surface water masses. Sedimentary regimes are then derived for glacial and deglacial settings. Atlantic water intrusions in the NGS reveal complex and highly dynamic patterns for the last two glacial and interglacial periods, with repetitive inflows during Isotope Stage 6 and a high variability in Isotope Stage 5. Specific facies patterns show maximum extensions of Atlantic Water intrusions during the climatic highstands 5.5.1, 5.3 and 5.1 and narrowest intrusions in the cool phases 5.4 and most pronounced in 5.2. In contrast, different glacio-marine depositional regimes depict variable sea ice coverage and supply of ice-rafted debris. Most conspicuous are short-term depositional events marked by diamictons, which are related to the high instabilities of continental ice sheets. Some of the diamictons seem to occur contemporaneously with Heinrich layers H1 and H2. The probable temporal and obvious phenomenological concidence of Heinrich layers and NGS diamictons suggests a common trigger mechanism which caused an almost simultaneous disintegration of huge continental ice masses along the shelves of North America and the eastern margin of the NGS. A previous estuarine circulation model claims regional upwelling along the eastern margin of the NGS for specific periods of the last deglaciation. The organic character of sediments covering the same time intervals show a clear predominance of reworked fossil organic matter and thus does not support the estuarine model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00192240
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  • 5
    Electronic Resource
    Electronic Resource
    Studies on the thyroid in transgenic mice expressing the genes for human and bovine growth hormone (1990)
    Springer
    Cellular and molecular life sciences 46 (1990), S. 1043-1046 
    Details
    ISSN: 1420-9071
    Keywords: Thyroid ; transgenic mouse ; human growth hormone ; thyroid hormones
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The thyroid glands of transgenic mice (TM) expressing the genes for human (h) and bovine (b) growth hormone (GH) were studied. The percentages of larger follicles inhGH TM of either sex were significantly greater than in the corresponding normal littermates, and follicles ranging up to 350 μm in diameter were present in malehGH TM. In contrast, thyroid follicles were only slightly enlarged in malebGH TM, and were unchanged in femalebGH TM. The serum concentrations of T4 were significantly decreased in malebGH TM and not altered in the other groups. Serum concentrations of T3 were slightly, but significantly increased in femalehGH TM and femalebGH TM, but were unaffected in male TM of either type. Since the principal difference between these foreign GHs in rodents is the additional lactogenic activity of human GH, these results may indicate that the effects of prolactin can influence the development of the thyroid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01940668
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  • 6
    Electronic Resource
    Electronic Resource
    Occurrence of polar stratospheric clouds at Kiruna (1999)
    Springer
    Annales geophysicae 17 (1999), S. 1457-1462 
    Details
    ISSN: 0992-7689
    Keywords: Atmospheric composition and structure (aerosols and particles, cloud physics and chemistry) ; Meteorology and atmospheric dynamics (mesoscale meteorology)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Polar stratospheric clouds (PSCs) are often observed in the Kiruna region in northern Sweden, east of the Scandinavian mountain range, during wintertime. PSC occurrence can be detected by ground-based optical instruments. Most of these require clear tropospheric weather. By applying the zenith-sky colour index technique, which works under most weather conditions, the data availability can be extended. The observations suggest that PSC events, especially of type II (water PSCs) may indeed more common than predicted by synoptic models, which is expected because of the frequent presence of mountain-induced leewaves. However, it will be of importance to increase the density of independent observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-999-1457-7
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  • 7
    Electronic Resource
    Electronic Resource
    On the directional sensitivity of hot-wires: a new look at an old phenomenon (1988)
    Springer
    Experiments in fluids 6 (1988), S. 553-560 
    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 The directional response of a constant temperature hotwire anemometer to variations in pitch and yaw is reviewed, and a new data reduction technique for obtaining velocity vector data in a steady flow is described. Sequential sampling of the signal as the probe shaft is rotated through 360° provides data to yield a three-dimensional velocity vector. Jorgensen's expression was found to be suitable for the data reduction using independently measured pitch and yaw coefficients. Within the range of velocity and flow direction investigated, the velocity magnitude and direction can be determined to within 2% and 2° respectively if the yaw coefficient is neglected. This measurement method is currently being used to determine velocity distributions on the intake-valve/cylinder boundary for different induction system designs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00196602
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  • 8
    Electronic Resource
    Electronic Resource
    Distribution of albumin in normal and regenerating livers of mice (1985)
    Springer
    Histochemistry and cell biology 83 (1985), S. 165-169 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The conditions affecting the immunohistochemical identification of albumin in livers of male NMRI-mice were investigated by light microscopy. In normal livers albumin is randomly distributed, revealing a pancytoplasmic nearly homogen reaction in groups of hepatocytes or single parenchymal cells. However, combined autoradiographic studies after pulse labelling with 3H-valin and perfusion experiments with human albumin indicate that this distribution is caused by albumin from blood plasma and does not reflect true protein synthesis. After perfusion of the livers followed by immunohistochemical amplification techniques which allowed to dilute the primary antibody up to 1:30,000, albumin could be detected nearly in all liver parenchymal cells as granular deposits decreasing in its density from periportal fields towards the terminal hepatic venules. In regenerating livers due to partial hepatectomy no remarkable differences in granular albumin deposits between G1- and S-phase of the cell cycle could be detected as was demonstrated by combined immunohistochemistry and 3H-dThd-autoradiography. However, during mitosis the content of albumin was often considerably reduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00495148
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  • 9
    Electronic Resource
    Electronic Resource
    On the L 1 convergence of kernel estimators of regression functions with applications in discrimination (1980)
    Springer
    Probability theory and related fields 51 (1980), S. 15-25 
    Details
    ISSN: 1432-2064
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary An estimate m n of a regression function m(x)=E{Y|X=x} is weakly (strongly) consistent in L 1 if ∝¦m n (x)-m(x)¦μ(dx) converges to 0 in probability (w.p. 1) as the sample size grows large (μ is the probability measure of X). We show that the well-known kernel estimate (Nadaraya, Watson) and several recursive modifications of it are weakly (strongly) consistent in L 1 under no conditions on (X, Y) other than the boundedness of Y and the absolute continuity of μ. No continuity restrictions are put on the density corresponding to μ. We further notice that several kernel-type discrimination rules are weakly (strongly) Bayes risk consistent whenever X has a density.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00533813
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  • 10
    Electronic Resource
    Electronic Resource
    Evidence of hydrous differentiation and crystal accumulation in the low-MgO, high-Al2O3 Lake Basalt from Medicine Lake volcano, California (1995)
    Springer
    Contributions to mineralogy and petrology 121 (1995), S. 201-216 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  The late Pleistocene Lake Basalt of Medicine Lake volcano, California is comprised of variably porphyritic basalt and basaltic andesite flows and scoria. These eruptives are similar in composition and phenocryst abundance to the low-MgO, high-Al2O3 mafic magmas common in convergent margin settings. The petrogenesis of the magmas that produced the Lake Basalt has been inferred from field relations, melting experiments and subsequent major and trace element modeling. Their formation involved both hydrous differentiation and plagioclase accumulation and thus the Lake Basalt can be used to constrain the relative contributions of these processes to the production of high-Al2O3 arc basalt. Phenocryst-poor lavas of the Lake Basalt formed by hydrous differentiation; their compositions and observed phenocrysts were reproduced in 1 kbar, H2O-saturated melting experiments. Anorthite-rich plagioclase compositions of the lavas of the Lake Basalt necessitate crystallization from melts with between 4 and 6 wt% dissolved H2O. Phenocryst-rich lavas of the Lake Basalt, with 18 modal% phenocrysts and greater, formed by plagioclase accumulation in magmas similar to the phenocryst-poor lavas. This interpretation is supported by the depleted incompatible element abundances and enriched Sr/Zr ratio of the more porphyritic lavas relative to the phenocryst-poor lavas. We model the formation of the Lake Basalt as a two-stage process that combines a differentiation model and a plagioclase accumulation model. Stage one involved hydrous fractionation, granitic assimilation and mixing with undifferentiated parent magma. This process generated lavas with up to 19.2 wt% Al2O3 and 7 modal% phenocrysts. In stage two, plagioclase accumulated in these liquids and produced more aluminous and porphyritic lavas with up to 21.8 wt% Al2O3 and 33 modal% phenocrysts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/
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