نتایج جستجو برای: wave velocity for applying avo technique

تعداد نتایج: 10629470  

Journal: :تحقیقات دامپزشکی 0
مجید مسعودی فرد گروه علوم درمانگاهی دانشکده دامپزشکی دانشگاه تهران علیرضا وجهی گروه علوم درمانگاهی دانشکده دامپزشکی دانشگاه تهران سارنگ سروری گروه علوم درمانگاهی دانشکده دامپزشکی دانشگاه تهران سمیه اسدزاده منجیلی دانش آموخته دانشکده دامپزشکی دانشگاه تهران

doppler ultrasound can provide important information about vascular problems through the analysis of blood flow wave-form. the purpose of this study was obtaining the normal images of color doppler and estimation of blood flow velocity parameters of femoral artery in rabbits. left and right femoral arteries of 8 healthy adult new zealand rabbits were evaluated. color and spectral doppler images...

D.S Pathania K Singh, R Kumar,

This paper studies the propagation of shear waves in a composite structure consisting of a piezoelectric layer perfectly bonded over a micropolar elastic half space. The general dispersion equations for the existence of shear waves are obtained analytically in the closed form. Some particular cases have been discussed and in one special case the relation obtained is in agreement with existing r...

Journal: :the journal of tehran university heart center 0
mohammad asadpour piranfar taleghani hospital, shahid beheshti university of medical sciences, tehran, iran. mersedeh karvandi taleghani hospital, shahid beheshti university of medical sciences, tehran, iran. arash mohammadi tofigh imam hussein hospital, shahid beheshti university of medical sciences, tehran, iran.

background: we sought to assess right ventricular (rv) systolic and diastolic functions via tissue doppler imaging (tdi) in order to discriminate right-to-left (bidirectional) from left-to-right intracardiac shunts. methods: a tissue doppler velocity study via doppler echocardiography was performed in 20 patients with left-to-right shunt (without evidence of significant pulmonary hypertension) ...

Journal: :Physical review letters 2012
Xiaofei Lu X-C Zhang

By applying a helical electric field along a plasma region, a revolving electron current is formed along the plasma and an elliptically polarized far-field terahertz wave pattern is observed. The observed terahertz wave polarization reveals the remarkable role of velocity retardation between optical pulses and generated terahertz pulses in the generation process. Extensive simulations, includin...

Journal: :civil engineering infrastructures journal 0
hasan ghasemzadeh assistant professor, k.n. toosi university of technology, civil engineering faculty, tehran, iran amir ali abounouri msc graduate, k.n. toosi university of technology, civil engineering faculty, tehran, iran

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...

Journal: :International Journal of Geosciences 2022

Nile Delta which covers approximately 60,000 square kilometers represents the most important gas province in Egypt whereas its fields provide two-thirds of production Egypt. The begins to display hydrocarbon potentiality early 1960s. Nidoco field is located shallow water offshore delta. Abu Madi formation (Messinian age) through all section where it main producing reservoirs Field. coming from ...

2012
A. Demčenko R. Akkerman P. B. Nagy

This work considers the characterization of linear PVC acoustic properties using a linear ultrasonic measurement technique and the non-collinear ultrasonic wave mixing technique for measurement of the physical ageing state in PVC. The immersion pulse-echo measurements were used to evaluate phase velocity dispersion and attenuation of longitudinal waves in PVC test specimens. The suggested nonco...

Journal: :Cancer research 2001
S Paglin T Hollister T Delohery N Hackett M McMahill E Sphicas D Domingo J Yahalom

The mechanisms underlying neoplastic epithelial cell killing by ionizing radiation are largely unknown. We discovered a novel response to radiation manifested by autophagy and the development of acidic vesicular organelles (AVO). Acidification of AVO was mediated by the vacuolar H+-ATPase. Staining with the lysosomotropic agent acridine orange enabled us to quantify AVO accumulation and to demo...

2002
Jianhua Yu

Reflection amplitude as a function of offset is effective in characterizing lithology in oil producing basins. Experience shows that AVO inversion methods based on amplitude-preserved prestack migration typically provides a more accurate lithology estimation than NMO-based AVO analysis. However, some artifacts may be introduced into the migration section, which can obscure the estimate of reser...

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