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Article
Open AccessAsymmetric magma plumbing system beneath Axial Seamount based on full waveform inversion of seismic data
The architecture of magma plumbing systems plays a fundamental role in volcano eruption and evolution. However, the precise configuration of crustal magma reservoirs and conduits responsible for supplying erup...
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Article
Low-rank Representation for Seismic Reflectivity and its Applications in Least-squares Imaging
Sparse representation and inversion have been widely used in the acquisition and processing of geophysical data. In particular, the low-rank representation of seismic signals shows that they can be determined ...
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Article
Open AccessDefect-driven nanostructuring of low-nuclearity Pt-Mo ensembles for continuous gas-phase formic acid dehydrogenation
Supported metal clusters comprising of well-tailored low-nuclearity heteroatoms have great potentials in catalysis owing to the maximized exposure of active sites and metal synergy. However, atomically precise...
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Article
High-Temporal-Accuracy Viscoacoustic Wave Propagation Based on k-Space Compensation and the Fractional Zener Model
The acoustic behavior in fluid attenuating media can be effectively simulated using a fractional Zener model (FZM). Because of the fractional time derivatives of both stress and strain in the constitutive rela...
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Article
Correction to: Mitigating Velocity Errors in Least-Squares Imaging Using Angle-Dependent Forward and Adjoint Gaussian Beam Operators
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Article
Geometry-preserving full-waveform tomography and its application in the Longmen Shan area
Classic L2-norm-based waveform tomography is often plagued by insurmountable cycle skip** problems; as a result, the iterative inversion falls into local minima, yielding erroneous images. According to the o...
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Article
Alcohol Synthesis via Fischer–Tropsch Synthesis over Activated Carbon Supported Alkaline Earth Modified Cobalt Catalyst
Although numerous efforts have been made in direct syngas conversion to higher alcohols via Fischer–Tropsch synthesis, the higher alcohols distribution remains a challenge. Here, we introduce alkaline earth me...
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Article
Mitigating Velocity Errors in Least-Squares Imaging Using Angle-Dependent Forward and Adjoint Gaussian Beam Operators
Compared with traditional adjoint-based migration, least-squares migration (LSM) can reduce finite-frequency effects, remove acquisition footprints and improve spatial resolution by solving a linear inverse pr...
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Article
Open AccessCaribbean plate tilted and actively dragged eastwards by low-viscosity asthenospheric flow
The importance of a low-viscosity asthenosphere underlying mobile plates has been highlighted since the earliest days of the plate tectonics revolution. However, absolute asthenospheric viscosities are still p...
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Article
Elastic Least-Squares Imaging in Tilted Transversely Isotropic Media for Multicomponent Land and Pressure Marine Data
Traditional elastic reverse-time migration (RTM) involves P-/S-wave separation for the source and receiver wavefields, followed by applying the zero-lag cross-correlation imaging condition to produce PP and PS...
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Article
Open AccessSeismic evidence for subduction-induced mantle flows underneath Middle America
Laboratory experiments and geodynamic simulations demonstrate that poloidal- and toroidal-mode mantle flows develop around subduction zones. Here, we use a new 3-D azimuthal anisotropy model constructed by ful...
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Article
Open AccessReal-time positioning of a specific object in the big data environment
Real-time positioning of a specific object in the big data environment can improve the monitoring and management capacity for network data. For the real-time positioning of the specific object, it is necessary...
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Article
Ru–PPh3@porous organic polymer: efficient and stable catalyst for the trickle bed regioselective hydrogenation of cinnamaldehyde
Ru supported on the porous vinyl-functional triphenylphosphine organic polymer (Ru–PPh3@POP) as a heterogeneous catalyst for the selective hydrogenation of cinnamaldehyde (CAL) was synthesized. This catalyst, whi...
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Article
Effect of Al2O3 Promoter on a Performance of C1–C14 α-Alcohols Direct Synthesis over Co/AC Catalysts via Fischer–Tropsch Synthesis
The influence of Al2O3 promoter on a performance of C1–C14 α-alcohols direct synthesis from syngas over activated carbon (AC) supported cobalt catalysts (Co/AC catalysts) was investigated using CO hydrogenation e...
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Article
Study on the effect of alkali promoters on the formation of cobalt carbide (Co2C) and on the performance of Co2C via CO hydrogenation reaction
The present investigation deals with an alkali metal assisted synthesis of cobalt carbide (Co2C), starting from carburizing reduced complex precursors (obtained from Co3O4 with the addition of Li2O, Na2O and K2O)...
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Article
Structure of the European upper mantle revealed by adjoint tomography
The structure of the European crust and upper mantle is precisely known only in limited regions. A new tomographic model for the entire European upper mantle identifies northeastward subduction of the Adria pl...
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Article
Effect of Vanadium Promotion on Activated Carbon-Supported Cobalt Catalysts in Fischer–Tropsch Synthesis
The effect of vanadium promotion on activated carbon (AC)-supported cobalt catalysts in Fischer–Tropsch synthesis has been studied by means of XRD, TPR, CO-TPD, H2-TPSR of chemisorbed CO and F-T reaction. It was ...
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Article
The formation of Co2C species in activated carbon supported cobalt-based catalysts and its impact on Fischer–Tropsch reaction
The cobalt carbide (Co2C) species was formed in some activated carbon supported cobalt-based (Co/AC) catalysts during the activation of catalysts. It was found that the activity of Fischer–Tropsch reaction over C...
