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all geography including DSDP/ODP Sites and Legs
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Asia
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China
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Xinjiang China
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Tarim Basin (1)
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Middle East
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Iran (1)
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Turkey
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Anatolia (1)
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Atlantic Ocean
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North Atlantic
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Gulf of Mexico (1)
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GeoRef Categories
Era and Period
Epoch and Age
Date
Availability
maximum entropy analysis
Image Identification and Land Use Management of Anomalous Minerals from Geophysical Information and Deep Convolutional Networks Available to Purchase
Three-dimensional regularized inversion of DC resistivity data with different stabilizing functionals Available to Purchase
A new method for NMR data inversion based on double-parameter regularization Available to Purchase
Seismic facies analysis based on speech recognition feature parameters Available to Purchase
Inversion of nuclear magnetic resonance echo data based on maximum entropy Available to Purchase
A combined Wigner-Ville and maximum entropy method for high-resolution time-frequency analysis of seismic data Available to Purchase
Frequency trend attribute analysis for stratigraphic division and correlation Available to Purchase
Improving Bayesian maximum entropy and ordinary Kriging methods for estimating precipitations in a large watershed: a new cluster-based approach Available to Purchase
Local mineral equilibrium in metamorphism: development of D. Korzhinskii’s ideas (on 110th anniversary of D.S. Korzhinskii) Available to Purchase
Single-crystal structure and electron-density analyses of Earth's interior under high-pressure and high-temperature conditions using synchrotron radiation Available to Purchase
Crystal structures together with physical properties under nonambient conditions are significant subjects in the effort to understand geophysical phenomena or solid-state physics. Miniature diamond anvil pressure cell (DAC) and multianvil high-pressure apparatus have become effective tools for the observation of pressure effects on crystalline materials, not only for X-ray diffraction measurements but also for physical property studies such as electrical conductivity and magnetism. These high-pressure studies have been made at high temperatures by electric resistance heater or laser and at low temperatures by cryostat. For the last twenty years, synchrotron radiation facilities have accelerated the study of high-pressure crystallography because of their great advantages for diffraction studies at nonambient conditions. Application of synchrotron radiation enhances structure analyses as a function of pressure. Pressure dependence of electron-density distributions around atoms is elucidated by single-crystal diffraction study using deformation electron-density analysis. In this study, compression mechanisms were investigated through structure analyses. The maximum entropy method (MEM) based on the observed structure F obs (hkl) of reflection hkl was applied to reveal an electron-density map, and the results were compared with difference Fourier synthesis based on F obs (hkl) – F calc (hkl). Radial electron distribution revealed the localization or delocalization of electrons around atomic positions together with bonding electron densities. The diffraction intensity measurements of FeTiO 3 ilmenite and γ-SiO 2 stishovite single crystals were made at high pressures. In both cases, the valence electrons became more localized around the cations with increasing pressure. This is consistent with molecular orbital calculations—both methods show that the bonding electron density becomes smaller with pressure. The thermal displacement parameters of both samples were reduced with increasing pressure.