نتایج جستجو برای: wave velocity

تعداد نتایج: 341742  

A. A. Golafshani B. Ataie Ashtiani M. R. Tabeshpour M. S. Seif

Because of fluctuation in leg tension, pitch motion is very effective fatigue and life safety of leg elements in tension leg structures (TLSs). In this paper an exact solution for pitch vibration of a TLS interacting with ocean wave is presented. The legs of TLP are considered as elastic springs. The flow is assumed to be irrotational and single-valued velocity potentials are defined. The effec...

ماندان هدایتی, , محمد امیرحمزه تفرشی, , محمد لامعی, ,

  A plasma focus facility is a magnetically confinement fusion device, characterized by a relatively simple structure. Nowadays, it is a well-known fact that the theory of shock waves stands for temperature increment in plasma of a PF device. On the other hand, we also know that computer simulations can make experimental works easier and more cost- effective. So based on the MHD theory, shock w...

Shokri, B. ,

The distribution function of the electrons produced in the interaction between an intense electromagnetic wave and a neutral gas is derived and is shown to be nonequilibrium and anisotropic. By assuming that the time scale of gas ionization is much greater than the field period, it is shown that the electron distribution function formed in microwave and optical discharges has sharp anisotropy a...

Journal: :Physical review applied 2022

The dependence of the velocity surface acoustic waves (SAWs) as a function an external applied magnetic field is investigated in $\mathrm{Fe}$ thin film epitaxially grown on piezoelectric $\mathrm{Ga}\mathrm{As}$ substrate. SAW observed to strongly depend both amplitude and direction field. To interpret experimental data phenomenological approach relative change implemented. We find that variat...

2011
Ji Hyun Kim Su Jin Oh Jung Min Lee Eun Gyoung Hong Jae Myung Yu Kyung Ah Han Kyung Wan Min Hyun Shik Son Sang Ah Chang

BACKGROUND Hypertension and type 2 diabetes mellitus are major risk factors for cardiovascular disease. This study analyzed the changes in central aortic waveforms and pulse wave velocity as well as related parameters after treatment with valsartan, an angiotensin II type 1 receptor blocker, in patients with type 2 diabetes and hypertension. METHODS We used pulse wave analysis to measure cent...

S Goyal S Mondal S.A Sahu,

The present problem deals with the propagation of Love-type surface waves in a bedded structure comprises of an inhomogeneous orthotropic layer and an elastic half-space. The upper boundary and the interface between two media are considered to be corrugated. An analytical method (separation of variables) is adapted to solve the second order PDEs, which governs the equations of motion. Equations...

Journal: :Journal of applied physiology 2001
E Laffon F Laurent V Bernard L De Boucaud D Ducassou R Marthan

We describe a magnetic resonance (MR) imaging method that emphasizes pressure wave velocity to noninvasively assess pulmonary arterial hypertension. Both the blood flow and the corresponding vessel cross-sectional area (CSA) were measured by MR phase mapping in the main pulmonary artery (MPA) in 15 patients. MPA pressures were also measured, in the same patients, by right-side heart catheteriza...

Journal: :Circulation 1988
C Y Choong V M Abascal J D Thomas J L Guerrero S McGlew A E Weyman

The relation of the Doppler transmitral flow velocity profile to left ventricular loading conditions and diastolic properties remains poorly described. We studied seven adult mongrel dogs with an open-chest right heart bypass model in which left atrial pressure, representing preload, was varied by controlling blood flow into the pulmonary artery and left ventricular systolic pressure, represent...

2015
Dexin Ye Yannick Salamin Jiangtao Huangfu Shan Qiao Guoan Zheng Lixin Ran

In Physics, causality is a fundamental postulation arising from the second law of thermodynamics. It states that, the cause of an event precedes its effect. In the context of Electromagnetics, the relativistic causality limits the upper bound of the velocity of information, which is carried by electromagnetic wave packets, to the speed of light in free space (c). In anomalously dispersive media...

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