the normalized full gradient (nfg) method defined by berezkin (1967, 1973 and 1998) is used for downward continuation maps. analytical downward continuation is a method to estimate the field closer to the source and consequently results in a better resolution of underground rock distribution. however, the usefulness of this process is limited by the fact that the operation is extremely sensitiv...

Abstract Marine magnetic anomalies play an essential role in plate tectonics and geodynamics. The conventional method to identify marine is visually compare synthetic observed anomaly profiles, there usually no quantitative evaluation for the identification results. Therefore, we developed sliding window curve similarity (SWCS) objectively quantitatively evaluate model tests practical applicati...

Three types of solvents with different polarity (cyclohexane, toluene and benzene), a nonionic surfactant Span 40 were used to prepare strontium aluminate (SrAl2O4) spinel nanoparticles by a reverse micelle method. The structure of SrAl2O4 nanoparticles was characterized by X-ray diffraction (XRD). The morphology and size of the synthesized materials were studied using field emission scanning e...

X-ray and optical observations of quadruply lensed quasars can provide a micro-arcsecond probe of the lensed quasar. In this paper we utilize X-ray observations of ten lensed quasars recorded with the Chandra X-ray Observatory as well as corresponding optical data obtained by either the Hubble Space Telescope or ground-based optical telescopes. These are analyzed in a systematic and uniform way...

X-ray and optical observations of quadruply lensed quasars can provide a microarcsecond probe of the lensed quasar, corresponding to scale sizes of ∼ 102 − 104 gravitational radii of the central black hole. This high angular resolution is achieved by taking advantage of microlensing by stars in the lensing galaxy. In this paper we utilize X-ray observations of ten lensed quasars recorded with t...

The method of simultaneous PP-PS inversion has recently been developed and tested on the 3-D Blackfoot seismic data set. This paper shows the application of this method on 3C-2D seismic data from Pikes Peak oilfield. The inversion was accomplished with a newly installed inversion module in ProMAX. After careful prestack processing, five limitedoffset stacked sections for each of the vertical an...

We present a new method to stabilize the three term AVO inversion using curvelet and wavelet transforms. Curvelets are basis functions that effectively represent otherwise smooth objects having discontinuities along smooth curves. The applied formalism explores them to make the most of the continuity along reflectors in seismic images. Combined with wavelets, curvelets are used to denoise the d...