Mamoru Takanashi

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Nonhyperbolic moveout analysis plays an increasingly important role in velocity model building because it provides valuable information for anisotropic parameter estimation. However, lateral heterogeneity associated with stratigraphic lenses such as channels and reefs can significantly distort the moveout parameters, even when the structure is relatively(More)
Moveout analysis of wide-azimuth reflection data is usually performed for smoothly varying velocity fields. However, velocity lenses in the overburden can cause significant laterally-varying errors in the moveout parameters and distortions in data interpretation. The main goal of this paper is to develop a correction for the influence of an elongated(More)
Robust estimation of anisotropy parameters is one of the most important problems in seismic imaging and fracture characterization. However, lateral heterogeneity (LH) on the scale smaller than spreadlength, often associated with velocity lenses in the overburden, can significantly distort anisotropy parameters even for gently dipping structures. In this(More)
An operating duty test of a high-voltage (64 kV) dc arrester was performed in the field. The results obtained were compared with those of a laboratory test on a prorated section of thec same arrester (8 kV). This comparison demonstrated the validity of the equivalent prorated test method. In another operating duty test conducted under the severe condition(More)
Moveout analysis of wide-azimuth reflection data seldom takes into account lateral velocity variations on the scale of spreadlength. However, velocity lenses (such as channels and reefs) in the overburden can cause significant, laterally varying errors in the moveout parameters and distortions in data interpretation. Here, we present an analytic expression(More)
One of the most serious problems in anisotropic velocity analysis is the trade-off between anisotropy and lateral heterogeneity, especially if velocity varies on a scale smaller than spreadlength. Here, we develop a P-wave MVA (migration velocity analysis) algorithm for transversely isotropic (TI) models that include layers with small-scale lateral(More)
Actinides-FP separation technologies based on the TRUEX and PUREX processes were summarised. Minor actinides were recovered from HLLW by ADvanced TRUEX flowsheet adopting salt-free reagents. Np was recovered by ADvanced PUREX flowsheet into the Pu-product fraction. Electrolytic extraction was prospective to separate several rare metals including some LLFPs(More)
The extraction of the response from field fluctuations excited by random sources has received considerable attention in a variety of different fields. We present three methods for the extraction of the systems response that are based on crosscorrelation, deconvolution, and the solution of an integral equation, respectively. For systems that are invariant(More)