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  • Other Sources  (143)
  • American Geophysical Union
  • International Union of Crystallography
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  • 1
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    Recent developments in the Inorganic Crystal Structure Database: theoretical crystal structure data and related features (2019)
    International Union of Crystallography | 5 Abbey Square, Chester, Cheshire CH1 2HU, England
    Details
    Publication Date: 2022-03-24
    Description: The Inorganic Crystal Structure Database (ICSD) is the world's largest database of fully evaluated and published crystal structure data, mostly obtained from experimental results. However, the purely experimental approach is no longer the only route to discover new compounds and structures. In the past few decades, numerous computational methods for simulating and predicting structures of inorganic solids have emerged, creating large numbers of theoretical crystal data. In order to take account of these new developments the scope of the ICSD was extended in 2017 to include theoretical structures which are published in peer‐reviewed journals. Each theoretical structure has been carefully evaluated, and the resulting CIF has been extended and standardized. Furthermore, a first classification of theoretical data in the ICSD is presented, including additional categories used for comparison of experimental and theoretical information.
    Description: The article discusses how theoretical crystal data are supplementing experimental data for simulation and prediction of structures of inorganic solids in the Inorganic Crystal Structure Database.
    Keywords: ddc:548
    Language: English
    Type: doc-type:article
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    CITATION GEO-LEO
  • 2
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    The precursor of instability for nonlinear systems and its application to earthquake prediction - the load-unload response ratio theory (1994)
    American Geophysical Union
    In:  Professional Paper, Open-File Rept., Nonlinear Dynamics and Predictability of Geophysical Phenomena, Washington, American Geophysical Union, vol. 4, no. 2, pp. 55-60, (ISBN 0080419208)
    Details
    Publication Date: 1994
    Keywords: Earthquake precursor: prediction research ; Non-linear effects ; Earthquake precursor: stresses ; Modelling ; Stress
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Nonlinear dynamic modeling of earthquake prediction (1994)
    American Geophysical Union
    In:  Bull., Open-File Rept., Nonlinear Dynamics and Predictability of Geophysical Phenomena, Washington, American Geophysical Union, vol. 5, no. 16, pp. 81-89, (ISBN 1-86239-165-3, vi + 330 pp.)
    Details
    Publication Date: 1994
    Keywords: Modelling ; Earthquake precursor: prediction research ; Earthquake precursor: models ; Chaotic behaviour
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Nonlinear dynamics of the transition from stable sliding to cyclic stick-slip in rock (1994)
    American Geophysical Union
    In:  Professional Paper, Nonlinear Dynamics and Predictability of Geophysical Phenomena, Washington, American Geophysical Union, vol. 65, no. 16, pp. 15-35, (ISBN: 3-540-23712-7)
    Details
    Publication Date: 1994
    Keywords: Non-linear effects ; Friction ; Fracture ; Physical properties of rocks
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    Numerically stable form factor of any polygon and polyhedron (2021)
    International Union of Crystallography | 5 Abbey Square, Chester, Cheshire CH1 2HU, England
    Details
    Publication Date: 2021-06-05
    Description: Coordinate‐free expressions for the form factors of arbitrary polygons and polyhedra are derived using the divergence theorem and Stokes's theorem. Apparent singularities, all removable, are discussed in detail. Cancellation near the singularities causes a loss of precision that can be avoided by using series expansions. An important application domain is small‐angle scattering by nanocrystals.
    Description: Coordinate‐free expressions for the form factors of arbitrary polygons and polyhedra are derived using the divergence theorem and Stokes's theorem. Series expansions are used to ensure numeric precision close to apparent singularities. image
    Keywords: 548 ; form factors ; polyhedra ; Fourier shape transform
    Type: article
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    CITATION GEO-LEO
  • 6
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    Combining reverse Monte Carlo analysis of X‐ray scattering and extended X‐ray absorption fine structure spectra of very small nanoparticles (2022)
    International Union of Crystallography | 5 Abbey Square, Chester, Cheshire CH1 2HU, England
    Details
    Publication Date: 2023-07-21
    Description: Finite size effects in partial pair distribution functions generate artefacts in the scattering structure factor and scattering intensity. It is shown how they can be overcome using a binned version of the Debye scattering equation. Accordingly, reverse Monte Carlo simulations are used for very small nanoparticles of LaFeO3 with diameters below 10 nm to simultaneously analyse X‐ray scattering data and extended X‐ray absorption fine structure spectra at the La K and Fe K edges. The structural information obtained is consistent regarding local structure and long‐range order.
    Description: Computing scattering intensity using the Debye scattering equation after binning interatomic distances avoids finite size artefacts and is efficient enough for simultaneous refinement of scattering data and extended X‐ray absorption spectra by reverse Monte Carlo simulations.
    Keywords: ddc:548 ; extended X‐ray absorption fine structure ; EXAFS ; wide‐angle X‐ray scattering ; WAXS ; reverse Monte Carlo ; RMC ; nanocrystals ; LaFeO3
    Language: English
    Type: doc-type:article
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    CITATION GEO-LEO
  • 7
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    X‐SPEC: a 70 eV to 15 keV undulator beamline for X‐ray and electron spectroscopies (2021)
    International Union of Crystallography | 5 Abbey Square, Chester, Cheshire CH1 2HU, England
    Details
    Publication Date: 2021-06-26
    Description: X‐SPEC is a high‐flux spectroscopy beamline at the KIT (Karlsruhe Institute of Technology) Synchrotron for electron and X‐ray spectroscopy featuring a wide photon energy range. The beamline is equipped with a permanent magnet undulator with two magnetic structures of different period lengths, a focusing variable‐line‐space plane‐grating monochromator, a double‐crystal monochromator and three Kirkpatrick–Baez mirror pairs. By selectively moving these elements in or out of the beam, X‐SPEC is capable of covering an energy range from 70 eV up to 15 keV. The flux of the beamline is maximized by optimizing the magnetic design of the undulator, minimizing the number of optical elements and optimizing their parameters. The beam can be focused into two experimental stations while maintaining the same spot position throughout the entire energy range. The first experimental station is optimized for measuring solid samples under ultra‐high‐vacuum conditions, while the second experimental station allows in situ and operando studies under ambient conditions. Measurement techniques include X‐ray absorption spectroscopy (XAS), extended X‐ray absorption fine structure (EXAFS), photoelectron spectroscopy (PES) and hard X‐ray PES (HAXPES), as well as X‐ray emission spectroscopy (XES) and resonant inelastic X‐ray scattering (RIXS).
    Description: X‐SPEC is a high‐flux undulator beamline for electron and X‐ray spectroscopy with an energy range from 70 eV to 15 keV. It offers X‐ray absorption spectroscopy (XAS), extended X‐ray absorption fine structure (EXAFS), photoelectron spectroscopy (PES) and hard X‐ray PES (HAXPES), as well as X‐ray emission spectroscopy (XES) and resonant inelastic X‐ray scattering (RIXS) for in vacuo, in situ and operando sample environments. image
    Keywords: 548 ; undulator beamline ; soft X‐ray ; tender X‐ray ; hard X‐ray ; in situ ; operando ; HAXPES ; RIXS ; XAS ; XES
    Type: article
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    CITATION GEO-LEO
  • 8
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    Ocean/atmosphere heat fluxes within the Agulhas Retroflection region (1988)
    American Geophysical Union
    In:  Journal of Geophysical Research, 93 (C12). pp. 15473-15483.
    Details
    Publication Date: 2020-11-18
    Description: The southern section of the Agulhas western boundary current system exhibits unique characteristics as regards ocean/atmosphere heat flux processes. The Agulhas Retroflection region's high heat flux core from 37°S to 41°S, 16°E to 22°E does not demonstrate a distinct annual cycle of turbulent heat fluxes (latent and sensible) as is characteristic of its northern hemisphere counterparts. Rather, a weak semiannual heat flux cycle is found with maximum average losses during winter and summer (200 and 211 W/m2 ) and minimum losses during spring and autumn (185 and 162 W/m2 ). Upstream where the Agulhas Current is closer to land, winter heat losses exceed those of summer, but the differences are small. This behavior contrasts with that encountered at the poleward ends of northern hemisphere western boundary currents where winter heat fluxes are several times those of summer. The main reason for this difference is persistent westerly and southwesterly wind flow over the Agulhas Retroflection region throughout the year which ensures that cold, unsaturated maritime air repeatedly forces loss of heat from the ocean's surface. Spatial heat flux gradients associated with the Agulhas‐Subtropical Convergence surface temperature front are more pronounced in summer than in winter, indicating that cyclogenesis locally may be less seasonally dependent than in the northern hemisphere situation. Average oceanic cooling rates in the core region of the Retroflection, based on net heat flux calculations and a mixed surface layer of 75 m, range from 1.35°C/month during winter to 0.25°C/month during summer. Interannual variability in ocean/atmosphere heat fluxes within the Agulhas Retroflection region often exceeds the variability illustrated by the annual cycle. West of the Agulhas Retroflection core region, interannual sea surface temperature (SST) anomalies are more influential in the generation of heat flux anomalies by virtue of their large temporal variability. This high SST variability is primarily attributed to interannual changes in flux of Agulhas Current water into the southeast Atlantic Ocean. Oceanic heat loss within this warm water zone is an important modifying influence to both ocean and atmosphere, thus meriting further research.
    Type: Article , PeerReviewed
    Format: text
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    PAPER (OCEANREP)
  • 9
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    Natural radioactivity of the crust and mantle (1995)
    American Geophysical Union
    In:  Professional Paper, Open-File Rept., Global Earth Physics: A Handbook of Physical Constants, Washington, American Geophysical Union, vol. 1, no. 16, pp. 283-291, (ISBN 0080419208)
    Details
    Publication Date: 1995
    Keywords: Review article ; radioactivity ; isotopes ; Geothermics
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    BIBLIOGRAPHY SEISMOLOGY
  • 10
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    Nonlinear Dynamics and Predictability of Geophysical Phenomena (1994)
    American Geophysical Union
    In:  Washington, 107 pp., American Geophysical Union, vol. IUGG Volume 18, no. 85, pp. 799-804, (ISBN 3-540-23219-2)
    Details
    Publication Date: 1994
    Keywords: Non-linear effects ; FractureT ; Chaotic behaviour ; SOC ; criticality ; Textbook of geophysics ; Dynamic ; Earthquake precursor: prediction research
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    BIBLIOGRAPHY SEISMOLOGY
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