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Maritime patrol and environmental monitoring tasks, and so on, had attracted the attention of the maritime authorities by USV which instead of some traditional vessels by men control. According to the requirements of the development of the USV and its experimental inconvenience, setting up model ship experiment platform in the service of USV experiments demand, making model ship as its carrier, and...
As a new, environmentally friendly, green active source, air-gun is widely applied in marine seismic exploration. This paper reviews the basis of single air-gun wavelet theoretically and related equations, analyzes several parameters which affect air-gun source wavelet. On the basis of Ziolkowski model, we simulate large volume air-gun array far-field wavelet, which is characterized with high primary-bubble...
One novel and convenient synthetic approach has been proposed to prepare the transition metal dichalcogenide material of nanocrystalline nickel disulfide (NiS 2 ) by the solid-state reaction between basic nickel carbonate and elemental sulfur at 400 °C. The as-synthesized product is characterized by X-ray powder Diffraction (XRD), Transmission Electron Microscopy (TEM), X-ray Photoelectron...
The infra-red spectra of three Chinese vacuum residua and their SARA fractions, together with their average chemical structure parameters obtained from elementary analyses, molecular weight determination and 1 H NMR measurement, have been employed to elucidate, to some extent, how the colloidally dispersed mixed asphaltenes-heavier resins clusters in the three typical Chinese petroleum vacuum...
Transmission electron micrographs obtained with the freeze-fracture replication technique on three typical Chinese vacuum residues and their fractions demonstrate that petroleum vacuum residues are colloidal systems, in which asphaltenes (the n-heptane-insoluble, toluene-soluble fraction) and heavier resins constitute the dispersed phases and the remaining lighter resins, aromatics and saturates the...
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