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  • 1
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    First directional European palaeosecular variation curve for the Neolithic based on archaeomagnetic data (2014)
    Elsevier Science Limited
    Details
    Publication Date: 2017-04-04
    Description: Neolithic, Chalcolithic and Bronze Age anthropogenic cave sediments from three caves from northern Spain have been palaeomagnetically investigated. 662 oriented specimens corresponding to 39 burning events (ash–carbonaceous couplets) from the three sites with an average of 16 samples per fire were collected. 26 new archaeomagnetic directions have been obtained for the time period ranging from 5500 to 2000 yr cal. BC. These results represent the oldest archaeomagnetic directions obtained from burnt archaeological materials throughout all Western Europe. Magnetisation is carried by pseudo-single domain low-coercivity ferromagnetic minerals (magnetite, magnetite with no significant isomorphous substitution and/or maghaemite). Rock-magnetic experiments indicate a thermoremanent origin of the magnetisation although a thermochemical magnetisation cannot be excluded. Combination of the new data presented here and the recent updated Bulgarian database allows us to propose the first European palaeosecular variation (PSV) curve for the Neolithic. A bootstrap method was applied for the curve construction using penalised cubic B-splines in time. The new palaeosecular variation curve is well constrained from 6000 BC to 3700 BC, the period with the highest density of data, showing a declination maximum around 4700 BC and a minimum in inclination at 4300 BC, which are not recorded by the recent global CALS10K.1b and regional SCHA.DIF.8K models due to the use of lake sediment data. Dating resolution by using the proposed PSV curve oscillates from approximately ±30 yr to ±200 yr for the period 6000 to 1000 yr BC, reaching similar resolution as radiocarbon dating. Considering the good preservation, age-control and widespread occurrence of burnt archaeological materials across Southern Europe, they represent a new source of data for geomagnetic field modelling, as well as for archaeomagnetic dating.
    Description: Published
    Description: 124-137
    Description: 1A. Geomagnetismo e Paleomagnetismo
    Description: JCR Journal
    Description: restricted
    Keywords: secular variation ; archaeomagnetism ; rock-magnetism ; thermoremanence ; Neolithic ; archaeology ; 04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals ; 04. Solid Earth::04.05. Geomagnetism::04.05.05. Main geomagnetic field ; 04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism ; 04. Solid Earth::04.05. Geomagnetism::04.05.07. Rock magnetism ; 04. Solid Earth::04.05. Geomagnetism::04.05.08. Instruments and techniques ; 04. Solid Earth::04.05. Geomagnetism::04.05.09. Environmental magnetism
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
    Electronic Resource
    Electronic Resource
    Transmission coefficients in anharmonic symmetrical potentials (1987)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 28 (1987), S. 636-642 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: Barrier transmission in potentials of the type V(x)=Ax2+Bx4 is studied using the phase integral method, the same as the JWKB approximation in lower orders. Elliptic functions are used for the classical solutions. The transmission coefficient is calculated for all signs and values of A and B that give a potential barrier.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.527650
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  • 3
    Electronic Resource
    Electronic Resource
    Nanocrystalline Cubic Zirconia Obtained from Zirconia and Dolomite Activated by a High-Energy Ball Milling Process (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 264-268 (May 2004), p. 2351-2354 
    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/2011/0528/01/48/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.264-268.2351.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Facile synthesis of E-γ-hydroxy-α,β-unsaturated sulfones from aldehydes
    Amsterdam : Elsevier
    Tetrahedron Letters 31 (1990), S. 2487-2490 
    Details
    ISSN: 0040-4039
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0040-4039(00)97396-9
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  • 5
    Electronic Resource
    Electronic Resource
    Structures of 9,9-dimethoxy-1-methyl-7-phenylsulfonylbicyclo[4.3.0]nonan-2-one (I) and 10,10-dimethoxy-8-phenylsulfonylbicyclo[5.3.0]decan-2-one (II) (1987)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 43 (1987), S. 2146-2148 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270187088693
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  • 6
    Electronic Resource
    Electronic Resource
    Release of 222Rn from some soils (1997)
    Springer
    Annales geophysicae 15 (1997), S. 124-133 
    Details
    ISSN: 0992-7689
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Measurements have been made of 222Rn release from diverse soils in the region surrounding Malaga, Spain. These flux measurements were carried out by two methods. A direct method using a static chamber technique and another indirect method obtained from concentration profile measurements of 222Rn in the soil air. The effects of meteorological variables and other parameters on 222Rn flux were studied. The factors that most affected the instantaneous value of 222Rn release were humidity and soil thermal gradient. The directly measured 222Rn fluxes at investigated sites are higher than 222Rn fluxes derived by the indirect method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-997-0124-0
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  • 7
    Electronic Resource
    Electronic Resource
    Immunohistochemical evidence of the presence of aromatase P450 in the rat hypophysis (1999)
    Springer
    Cell & tissue research 295 (1999), S. 419-423 
    Details
    ISSN: 1432-0878
    Keywords: Key words Hypophysis ; Aromatase ; Immunocytochemistry ; Morphometry ; Gender differences ; Rat (Sprague Dawley)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract In order to analyze whether aromatase is present in the hypophysis of adult rats, we have performed an immunohistochemical study in young adult male and female rats. Our study has revealed that the hypophysis of adult rats contains aromatase, although marked differences are found between the sexes. The hypophyses of male rats have cells immunoreactive for the enzyme, 34.40% of these hypophyseal cells showing reaction. By contrast, cells from female rats show very little reaction, only 0.84% of them being reactive. No significant differences in the percentage of immunoreactive cells between one phase and another are observed during the estrous cycle. Our results point to the immunohistochemical expression of aromatase in the hypophysis of adult rats and at the same time suggest that its expression is sex-dependent. The enzyme may therefore be involved in the regulation of adenohypophyseal cytology by androgens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004410051248
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  • 8
    Electronic Resource
    Electronic Resource
    Morphological and functional study of the GH-immunoreactive adenohypophyseal cells in ovariectomized rats (1990)
    Springer
    Journal of molecular histology 22 (1990), S. 683-687 
    Details
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In view of the existence of a different secretion pattern of growth hormone (GH) between male and female rats, the aim of the present study was to analyse the role played by ovarian steroid hormones in the modulation of such secretion. To do so, postpuberal female rats were ovariectomized and killed at 30 days after the operation. The basal serum levels of growth hormone, together with cell area, cytoplasmic area and nuclear area of the hypophyseal somatotropic cells of normal and ovariectomized rats were compared. The results obtained show that ovariectomy induces a significant decrease (p〈0.05) in the basal serum levels of GH, accompanied by an increase in cellular and cytoplasmic areas, with no significant differences in nuclear area. Overiectomy was also accompanied by an increase in reaction intensity and the number of GH-immunoreactive cells (p〈0.01). These findings point to the shift towards a masculine secretory and morphological pattern following ovariectomy and supports the hypothesis that ovarian steroids intervene in the establishment of a different pattern in females compared to males.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01047453
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  • 9
    Electronic Resource
    Electronic Resource
    Consumption of methane by soils (1994)
    Springer
    Environmental monitoring and assessment 31 (1994), S. 125-130 
    Details
    ISSN: 1573-2959
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Measurements of the methane flux and methane concentration profiles in soil air are presented. The flux of methane from the soil is calculated by two methods: a) Direct by placing a static open chamber at the soil surface. b) Indirect, using the 222Rn concentrations profile and the 222Rn flux in the soil surface in parallel with the methane concentration (222Rn calibrated fluxes). The methane flux has been determined in two kinds of soils (sandy and loamy) in the surroundings of Málaga (SPAIN). The directly measured methane fluxes at all investigated sites is higher than methane fluxes derived from “Rn calibrated fluxes”. Atmospheric methane is consumed by soils, mean direct flux to the atmosphere were - 0.33 g m−2yr-1. The direct methane flux is the same within the measuring error in sandy and loamy soils. The influence of the soil parameters on the methane flux indicates that microbial decomposition of methane is primarily controlled by the transport of methane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00547187
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  • 10
    Electronic Resource
    Electronic Resource
    The Atapuerca human fossils (2000)
    Springer
    Human evolution 15 (2000), S. 75-82 
    Details
    ISSN: 1824-310X
    Keywords: Atapuerca ; Sima de los Huesos ; Homo heidelbergensis ; Gran Dolina ; Homo antecessor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract After 20 years of research, the Atapuerca sites have provided a large amount of archaeological and palaeontological remains. Human fossils have been found in three sites: Gran Dolina, galería and Sima de los Huesos. The Early Pleistocene human fossils from Gran Dolina have been ascribed to a new species,Homo antecessor, that represent the last common ancestor of Neandertals and modern humans. The Sima de los Huesos fossils and all the European Middle Pleistocene human fossils are the ancestors exclusively of the Neandertals, which evolved in Europe in conditions of geographic and genetic isolation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436236
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