نتایج جستجو برای: wave velocity and s

تعداد نتایج: 16979830  

Journal: :Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology 2015
R Axt-Fliedner O Graupner A Kawecki J Degenhardt J Herrmann A Tenzer A Doelle A Willruth J Steinhard U Gembruch F Bahlmann C Enzensberger

OBJECTIVE The outcome of patients with hypoplastic left heart syndrome (HLHS) is influenced by right ventricular function. This study aimed to investigate whether differences in right ventricular function of fetuses with HLHS are present during gestation. METHODS This was a prospective study comprising 14 fetuses with HLHS (28 measurements obtained in total) and 28 normal control fetuses (31 ...

2015
Dan Dan Sun Chuan Ju Hou Li Jun Yuan Yun You Duan Ying Hou Fang Ping Zhou

The aim of this study was to analyze the changes of the middle hepatic vein (MHV) spectra in patients with pulmonary hypertension (PH) caused by congenital heart disease (CHD) and determine the proper parameters of MHV to predict PH. Eighty patients with CHD were included, whose pulmonary artery pressure was measured via right heart catheterization, and the MHV spectra were detected via echocar...

‎The water wave generation by wave paddle and a freely falling rigid body are examined by using an Incompressible Smoothed Particle Hydrodynamics (ISPH)‎. ‎In the current ISPH method‎, ‎the pressure was evaluated by solving pressure Poisson equation using a semi-implicit algorithm based on the projection scheme and the source term of pressure Poisson equation contains both of divergence free ve...

2012
Nanna B. Johansen Dorte Vistisen Eric J. Brunner Adam G. Tabák Martin J. Shipley Ian B. Wilkinson Carmel M. McEniery Michael Roden Christian Herder Mika Kivimäki Daniel R. Witte

BACKGROUND Aortic stiffness is a strong predictor of cardiovascular disease endpoints. Cross-sectional studies have shown associations of various cardiovascular risk factors with aortic pulse wave velocity, a measure of aortic stiffness, but the long-term impact of these factors on aortic stiffness is unknown. METHODS In 3,769 men and women from the Whitehall II cohort, a wide range of tradit...

رفیع‌زاده, امین, زندی, سید مهدی,

In this article, a meshless method based on exponential basis functions (EBFs) is presented to simulate the harmonic waves with moving free-surfaces generated by the piston-type wave maker. Accordingly, velocity potential is adopted in a Mixed Eulerian-Lagrangian (MEL) approach. Boundary conditions are met through a point-wise collocation approach. In order to update the geometry in the simulat...

Journal: :فیزیک زمین و فضا 0
الهام شعبانی دانشجوی دکتری ژئوفیزیک، گروه فیزیک زمین، مؤسسة ژئوفیزیک دانشگاه تهران نوربخش میرزائی دانشیار، گروه فیزیک زمین، مؤسسة ژئوفیزیک دانشگاه تهران ابراهیم حق شناس استادیار، پژوهشگاه بین المللی زلزله شناسی و مهندسی زلزله، تهران مرتضی اسکندری قادی دانشیار، گروه علوم پایه مهندسی، پردیس دانشکده های فنی، دانشگاه تهران

recordings of ambient noise or microtremors are increasingly used to find valuable information on soil in one dimension at a given site. ambient vibrations, which are assumed to be mainly composed of surface waves, can be used to determine the surface wave dispersion curve in order to retrieve shear wave velocity profile. in this regard, microtremors are usually recorded simultaneously in an ar...

2013
Anna Foster Göran Ekström Meredith Nettles

S U M M A R Y We calculate two-station phase measurements using single-station measurements made on USArray Transportable Array data for surface waves at periods from 25 to 100 s. The phase measurements are inverted for baseline Love and Rayleigh wave phase velocity maps on a 0.5◦ × 0.5◦ grid. We make estimates of the arrival angle for each event at each station using a mini array method simila...

Journal: :American journal of physiology. Gastrointestinal and liver physiology 2010
Gregory O'Grady Peng Du Leo K Cheng John U Egbuji Wim J E P Lammers John A Windsor Andrew J Pullan

Slow waves coordinate gastric motility, and abnormal slow-wave activity is thought to contribute to motility disorders. The current understanding of normal human gastric slow-wave activity is based on extrapolation from data derived from sparse electrode recordings and is therefore potentially incomplete. This study employed high-resolution (HR) mapping to reevaluate human gastric slow-wave act...

Journal: :فیزیک زمین و فضا 0
سید محمود اظهری دانشجوی دکتری زلزله شناسی، گروه فیزیک زمین، موسسه ژئوفیزیک دانشگاه تهران، ایران مهدی رضاپور دانشیار، گروه فیزیک زمین، موسسه ژئوفیزیک دانشگاه تهران، ایران مصطفی جوان مهری کارشناس ارشد زلزله شناسی، گروه فیزیک زمین، موسسه ژئوفیزیک دانشگاه تهران، ایران

iran is located between two lithospheric plates (euroasia, arabian) and these two plates converge toward each other with a velocity of 25 mm/yr rate. shortening that produced from this convergence with makran subductin shows faulting and folding in zagros orogenic belt, alborz and kopedagh in north and sliding in sum strike slip faults with north-south trend in central iran. the nw-se trending ...

2005
Eisuke Nagashima Toshiro Maeda

1. Abstract In order to predict strong earthquake ground motion, it is inevitable to construct a relevant subsurface structure model, especially S-wave velocity structure of the site of consideration. Inversion analysis with micro-tremor observation is frequently used to acquire S-wave velocity structure due to its convenience and inexpensiveness. Usually inversion analysis is carried out for e...

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