نتایج جستجو برای: wave velocity for applying avo technique

تعداد نتایج: 10629470  

ژورنال: ژئوفیزیک ایران 2020
Fatemeh Pourkamar Hashem Shahsavani

Normal Incidence Point (NIP) wave tomography inversion has been recently developed to generate a velocity model using Common Reflection Surface (CRS) attributes, which is called the kinematic wavefield attribute. In this paper, we propose to use the model based Common Diffraction Surface (CDS) stack method attributes instead of data driven Common Reflection Surface attributes as an input data p...

2017
Takashi Hirose Hisashi Nakahara Takeshi Nishimura

Coda-wave interferometry is a technique to detect small seismic velocity changes using phase changes in similar waveforms from repeating natural or artificial sources. Seismic interferometry is another technique for detecting seismic velocity changes from cross-correlation functions of ambient seismic noise. We simultaneously use these two techniques to clarify seismic velocity changes at Sakur...

Journal: :فیزیک زمین و فضا 0
احمد ادیب دانشیار، گروه مهندسی نفت، دانشکده فنی، دانشگاه آزاد اسلامی واحد تهران جنوب، تهران، ایران

summary based on the results of the analysis of site effects, mostly those with shear wave velocity and the fundamental period chosen as the basis for classification. in revision of earthquake resistant design regulations for buildings, classification of lands should be subject to the field conditions, geological, geotechnical, geophysical, and laboratory tests.in this context, the average shea...

Stress waves contain useful information about the properties of porous materials; they can be recovered through different non-destructive testing methods such as crosswell, vertical seismic profile, borehole logging as well as sonic tests. In all these methods, it is crucial to assess the effects of frequency on wave attributes including velocity and intrinsic attenuation. The dependency of per...

Hossein Ali Ebrahimi, Mandana Jafari, Najmeh Moradi, Narges Khanjani,

Abstract Introduction: neuropathy is a condition in which the peripheral nervous system is disrupted. The study of the effects of antioxidants on the performance improvement of this system is vital. This study was aimed at the investigation of the effects of date extract on nerve conduction velocity, distal latency, and wave height of the sciatic nerve in male rats. Materials and Methods: thi...

Journal: :geopersia 2015
ali kadkhodaie-ilkhchi

optimization of reservoir parameters is an important issue in petroleum exploration and production. the ant colony optimization(aco) is a recent approach to solve discrete and continuous optimization problems. in this paper, the ant colony optimization is usedas an intelligent tool to estimate reservoir rock properties. the methodology is illustrated by using a case study on shear wave velocity...

A. Eynalvandpour H. Aminfar, M. Mohammadpourfard,

Gas holdup and bubble size are important parameters for simulation and designing in bubble column reactors. Because based on these parameters, the available gas-liquid interfacial area is defined for mass transfer. In this paper, the results of applying magnetic fields on the velocity field and volume fraction of gas holdup are reported. Hydrodynamics of the bubble column in the reactors is inv...

2012
Nori Nakata Roel Snieder

Shear-wave velocity is an indication of the shear strength of the ground since the velocity is related to the shear modulus. Therefore, monitoring the velocities is useful for site characterization and disaster prevention. We estimate the time-lapse change in shear-wave velocity as well as shear-wave splitting in the shallow subsurface throughout Japan by applying seismic interferometry to the ...

2014
Youngeun Cho Semyung Wang Kihwan Park

Direct impedance control (DIC) technique used for an electroacoustic absorber in this paper requires a pair of pressure and velocity sensor. However, it can be quite costly to develop array system of this electrostatic absorber for acoustically large space. To overcome this problem, in this paper instead of using velocity sensor, disturbance-observer-type velocity estimator is applied to DIC te...

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