نتایج جستجو برای: depth and velocity

تعداد نتایج: 16854878  

baryonic matter distribution in the large-scale structures is one of the main questions in cosmology. This distribution can provide valuable information regarding  the processes of galaxy formation and evolution. On the other hand, the missing baryon problem is still under debate. One of the most important cosmological structures for studying the rate and  the distribution of the baryons is gal...

2011
Krishnan Balasubramaniam

Ground Penetrating Radar is becoming increasingly popular to use as a non-destructive assessment method for investigating reinforced concrete structures. The large amount of data collected take significant level of experience to interpret. Ground Penetrating Radar scans of concrete produce images which are made of arc segments. The shape of each arc is determined by the shape of the object, pos...

2002
Inmaculada Serrano Dapeng Zhao José Morales

Three-dimensional P and S wave velocity models of the crust under the Granada Basin in Southern Spain are obtained with a spatial resolution of 5 km in the horizontal direction and 2 to 4 km in depth. We used a total of 15407 P and 13704 S wave highquality arrival times from 2889 local earthquakes recorded by both permanent seismic networks and portable stations deployed in the area. The comput...

Journal: :Proceedings of the ... AAAI Conference on Artificial Intelligence 2023

Self-supervised monocular methods can efficiently learn depth information of weakly textured surfaces or reflective objects. However, the accuracy is limited due to inherent ambiguity in geometric modeling. In contrast, multi-frame estimation improve thanks success Multi-View Stereo (MVS), which directly makes use constraints. Unfortunately, MVS often suffers from texture-less regions, non-Lamb...

Journal: :فیزیک زمین و فضا 0
پویا هادیان اداره ژئوفیزیک، مدیریت شرکت ملی نفت ایران، تهران، ایران عبدالرحیم جواهریان استاد بازنشسته، گروه فیزیک زمین، مؤسسه ژئوفیزیک، دانشگاه تهران و استاد دانشکده مهندسی نفت دانشگاه صنعتی امیرکبیر، تهران، ایران بهزاد نظری مرکز پردازش، شرکت عملیات اکتشاف نفت، تهران، ایران

in exploration seismology, migration refers to a multi-channel processing step that attempts to spatially re-position events and improve focusing. before migration, seismic data is usually displayed with traces plotted at the surface location of the receivers and with a vertical time axis. this means that dipping reflections are systematically mispositioned in the lateral coordinate and the ver...

Journal: :Communications, Faculty of Science, University of Ankara Series C Biology, Geological Engineering and Geophysical Engineering 1987

2012
Yunfeng Li Weishan Han Chuen-song Chen Tony Huang

Recently, tilted transverse isotropic (TTI) imaging has become a standard practice in deep water Gulf of Mexico (GOM) to resolve the anisotropic effects of wave propagation in salt-withdrawal mini-basins. Compared with isotropic and vertical transverse isotropic (VTI) imaging, TTI prestack depth imaging generally provides flatter common image gathers (CIGs) for WAZ data, improves image focusing...

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