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  • 2015-2019  (20)
  • 1985-1989  (55)
  • 1960-1964  (7)
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  • 1
    facet.materialart.
    Unknown
    Oldest entirely preserved sponges and other fossils from the Lowermost Cambrian and a new facies reconstruction of the Yangtze platform (China) (2018)
    Details
    Publication Date: 2021-04-27
    Description: Eine Faziesrekonstruktion W1d Korrelation obersinischer-unterkambrischer Schichten der Yangtze-Plattform (Südchina) wird vorgestellt. Dabei wird zwischen geschütztem Becken, Schwelle W1d tiefem Becken unterschieden. Die unterkambrische Schwarzschiefer-Transgression, der "Badaowan" Event, wird als diachron gekennzeichnet. Nach Untersuchungen der Lithologie W1d Geochemie der unterkambrischen Sedimente, vorwiegend Schwarzschiefer des Profils Sansha (nahe Dayong. N-Hunan), kann zwischen Sedimenten, die unter teilweise anoxischen Bedingungen oder im stagnierenden Becken abgelagert wurden, unterschieden werden. Schwammnadeln sind im untersten Unterkambrium Zentralchinas weit verbreitet. Neufimde vollständiger hexactinellider Schwämme Sanshadictya microreticulata gen. et sp. 0., Hyalosinica archaica gen. et sp.o., Triticispongia diagonata gen. et sp. n., Solactiniella plumata gen. et sp. 0., Hunanospongia sp. QIAN & DING, 1988, Hexactinellida indet., eines fraglichen vertreters der Demospongiae, Saetaspongia densa gen. et sp. 0. sowie eines Vertreters der Malacostraca Perspicaris sp., W1d einer unbenannten A1genfonn, werden vorgestellt. Schwammnadeln wurden ebenfalls neu in Gesteinen des Shibantan Mb. (Dengying Fm., Ob. Proterozoikum) vom Straßenaufschluß Liantuo (nahe Yichang. S-Hubei) gefunden. Die Fauna vorwiegend hexactinellider Schwämme von Sansha wird im Zusammenhang mit den taphonornisch AhnIichen Spongienfaunen des Red Hil1s Quarry (Mitteldevon, Nevada) und des Arnager Kalkes (Kreide, Bomholm) diskutiert.
    Description: A facies reconstruction and correlation ofUpper Sinian - Lower Cambrian strata ofthe Yangtze platform (South China) is presented. Protected basin, uplift and deep basin development may be distinguished. The Lower Cambrian black shale transgression, the "Badaowan" Event, is characterized as diachronous. As a result of these investigations of lithology and geochemistry of the Lower Cambrian sediments (mainly black shales ofthe Sansha section, near Dayong. N. Hunan), sediments deposited under partially anoxic conditions or in a stagnant basin have been recognized. Sponge spicules are widely distributed in the lowennost Lower Cambrian of CentraI China. Recently discovered more or less complete sponges, including Sanshadictya microreticulata gen. et sp. 0., Hyalosinica archaica gen. et sp. 0., Triticispongia diagonata gen. et sp. 0., Solactiniella plumata gen. et sp. 0., Hunanospongia sp. QIAN & DING, 1988, Hexactinellida indet., a questionable demosponge, Saetaspongia densa gen. et sp. 0., and the Malacostraca Perspicaris sp., and an unnamed a1ga are described. Sponge spicules additionally were found in rocks of the Shibantan Mb. (Dengying Fm., Upper Proterozoic) from the road section of Liantuo (near Yichang. S.Hubei province). The fauna ofmainly hexactinellid poriferans from Sansha is discussed with regard to the similar taphonomy ofthe sponge faunas from the Red Hills Quarry (MiddIe Devonian ofNevada) and from the Arnager Iirnestooe (Cretaceous, Bomholm).
    Keywords: Paläontologie: Allgemeines ; 551 ; VU 000 ; 38.20 ; 38.2
    Language: English
    Type: article , publishedVersion
    Format: application/pdf
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    CITATION GEO-LEO
  • 2
    Electronic Resource
    Electronic Resource
    Influence of linear and nonlinear excitations in the ferromagnetic S=1/2 chain system [C6H11NH3]CuBr3 (CHAB) (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3956-3958 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties of the title compound have been studied by measurements of the nuclear spin-lattice relaxation time T1, the uniform magnetization M, and by quasielastic and inelastic neutron scattering. The field and temperature dependence of T1 and the wave-number dependence of the magnon excitation energy can be satisfactorily described by linear spin-wave theory. A good description of M, however, requires a contribution from kink solitons. The available evidence suggests that, in contrast to the linear excitations, the nonlinear excitations in CHAB for B(parallel)c can be described very well by a classical model, which is consistent with the interpretation of earlier heat-capacity measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338596
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  • 3
    Electronic Resource
    Electronic Resource
    Thin-film CdSe: Photoluminescence and electronic measurements (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 2601-2606 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electronic properties of thin CdSe films prepared through physical vapor transport were investigated using photoluminescence (PL) and electronic measurements. The films were studied at each of the main preparation steps, i.e., evaporation, annealing, etching, and finally photoetching. At 3 K two distinct donor-acceptor (DA) transitions at 1.75 and 1.70 eV were found in the photoluminescence spectra in addition to deep states at about 1.55 eV at 20 K. These DA transitions which are produced mainly during the evaporation might be associated with group VII and with alkali metal impurities. After each preparation step the DA transitions change their intensities. It is shown that photoetching of the films leads to a removal of the deep centers, while the 1.75 eV transition is blue shifted. In contrast with single-crystal CdSe the intensity of the PL increases after photoetching. The results of the PL are consistent with the electronic measurements. They are explained in terms of a previously published model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341649
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  • 4
    Electronic Resource
    Electronic Resource
    n-ZnO/p-CdSiAs2 heterojunction solar cells (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 1560-1561 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Heterojunction solar cells were prepared by magnetron sputtering of n-ZnO onto p-CdSiAs2 single crystals. These crystals were grown by chemical vapor-phase transport and have a resistivity of 2 Ω cm, a Hall mobility of 300 cm2/V s, and a net carrier density of 1016 cm−3 at room temperature. The heterojunctions exhibit short-circuit current densities up to 12 mA/cm2 and open-circuit voltages between 180 and 250 mV with power conversion efficiencies up to 1% under 72 mW/cm2 halogen lamp illumination. Open-circuit voltage values could be increased by heat treatment at 80 °C for 15 min in an argon atmosphere. By measuring the reflection and the quantum yield versus wavelength the efficiency losses in the short-wavelength region could be attributed to the corresponding high reflection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341835
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  • 5
    Electronic Resource
    Electronic Resource
    Inelastic neutron scattering studies on 1D near-Heisenberg antiferromagnets: A test of the Haldane conjecture (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3953-3955 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Our studies of the spin dynamics for two near-Heisenberg antiferromagnets (AFMs) revealed: In CsNiCl3 (S=1) at low T(very-much-less-than)TN we confirm the conclusions given earlier, but disagreement with the spin-wave calculations used is found for the eigenvectors. For T〉TN, the most important result is the observation that all 〈SαSα〉 (α=x,y,z) are identical, demanding another interpretation for the gap observed than the easy axis one. In CsVCl3 (S= (3)/(2) ) we could not observe any inconsistency in the microscopic parameters determined above and below TN. Although there is a striking coincidence with Haldane's conjecture [unexplained gap for S=1 (CsNiCl3), no such gap for S= (3)/(2) (CsVCl3)], it is not clear whether this can be considered a proof for Haldane's conjecture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338595
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  • 6
    Electronic Resource
    Electronic Resource
    Incommensurable magnetic structure and soft mode behavior in CsFeCl3 (abstract) (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3770-3770 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The class of 1-D ferromagnetic chain systems AFeCl3 (A=Rb,Tl,Cs) are of special interest in the group of 1-D magnets of the type ABX3. This is because of the strong single-ion-anisotropy D, which favors a nonmagnetic singlet-ground state. If however the exchange interaction J is large enough, with d=D/J〈1 the system has a magnetic ground state with easy plane anisotropy. While RbFeCl3 has a magnetic ground state, CsFeCl3 has not; it is however possible to induce a magnetic moment through the Zeeman splitting of the first excited state. We have therefore studied CsFeCl3 by neutron scattering experiments in external magnetic fields, H¯(parallel)c¯. Such experiments yield a strong quasi-elastic scattering around Q=(0.294,0.353,0) and Q=(0.353,0.294,0) at H≥4 T, due to the dynamical behavior of the correlated clusters of spins in the easy plane. At higher fields or lower temperatures true elastic scattering occurs at incommensurable positions with Q¯=(1/3−x,1/3−x,0). Further increase of fields or decrease of temperature leads to discrete changes of x, which finally lock in at the commensurate 120 spin structure. We explain the incommensurate phases as a result of the competition between dipole- and exchange-interaction. In addition we performed inelastic measurements in fields up to 5.4 T, which cannot be explained by spinwave theory. These inelastic results are discussed on the basis of the exciton model using the RPA decoupling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334969
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  • 7
    Electronic Resource
    Electronic Resource
    Enzymatic Defects of Heme Synthesis In Thalassemia (1964)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 119 (1964), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1965.tb54055.x
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  • 8
    Electronic Resource
    Electronic Resource
    Wachstumshemmung durch niedere Fettsäuren beiEndomycopsis vernalis (1961)
    Springer
    Naturwissenschaften 48 (1961), S. 630-630 
    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/BF00591219
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  • 9
    Electronic Resource
    Electronic Resource
    Besprechungen (1956)
    Springer
    Naturwissenschaften 43 (1956), S. 167-168 
    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/BF00623118
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  • 10
    Electronic Resource
    Electronic Resource
    Ist das Fett von Penicillium javanicum ein Reservestoff? (1963)
    Springer
    Archives of microbiology 46 (1963), S. 185-189 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00408208
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