نتایج جستجو برای: doppler c
تعداد نتایج: 1099754 فیلتر نتایج به سال:
Background: Prediction of adverse perinatal and postnatal outcomes could be possible by using ultrasound Doppler evaluation, however there are some controversies regarding this issue in the literature. The goal of present study was to evaluate predictive value of Doppler indices in single and twin pregnancies during second trimester. Materials and Methods: This prospective study was conducted i...
OBJECTIVE To evaluate the perinatal outcome of MC twins with selective IUGR (sIUGR). STUDY DESIGN A prospective study, which included three groups of MC twins: Group A, uncomplicated MC twin pregnancies (n = 91); group B, sIUGR with normal umbilical artery Doppler (n = 19); and group C, sIUGR with abnormal (absence or reversed EDV) umbilical artery Doppler (n = 18). The latter were routinely ...
This paper discusses spacecraft Doppler tracking, the current-generation detector technology used in the low-frequency (∼millihertz) gravitational wave band. In the Doppler method the earth and a distant spacecraft act as free test masses with a ground-based precision Doppler tracking system continuously monitoring the earth-spacecraft relative dimensionless velocity 2Δv/c = Δν/ν0, where Δν is ...
Background: Diagnostic ultrasound has been used to detect human disease especially fetus abnormalities in recent decades. Although the harmful effects of diagnostic ultrasound on human have not been established so far, several researchers showed it has had bioeffects in cell lines and in experimental animals. Three-dimensional (3D), four-dimensional (4D), and color Doppler sonography are new te...
An ultra-high-speed spectral domain optical Doppler tomography (SD-ODT) system is used to acquire images of blood flow in a human retina in vivo, at 29,000 depth profiles (A-lines) per second and with data acquisition over 99% of the measurement time. The phase stability of the system is examined and image processing algorithms are presented that allow accurate determination of bi-directional D...
Cadmium-incorporated Li2FeSiO4/C composites have been successfully synthesized by a solid-state reaction assisted with refluxing. The effect and mechanism of Cd-modification on the electrochemical performance of Li2FeSiO4/C were investigated in detail by X-ray powder diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, Raman spectra, transmission electron microscopy, pos...
l i p D b p d a s m m a d c s w n fi t w c m a a t p o i e t m p c i n g Echocardiography plays a key role in the evaluation of patients presenting with congestive heart failure (CHF). This includes diagnosis, prognosis, and guiding treatment decisions. Aside from the important measurements of left ventricular (LV) volumes and ejection fraction (EF), Doppler can be successfully applied to asses...
It is known that the redshift in the standard model of cosmology, defined by the expression z a t a t o + = 1 b g b g b g , is usually explained as a kinematic Doppler effect induced by the recession of galaxies. It is shown in this work that this treatment is physically wrong. According to the mathematical formalism of the standard model, the redshift is formed in the process of light propagat...
FEPMR is standing for Front-End and Doppler Processing for Monopulse Doppler Radar. It is a PCB at the frontier between the RF and the Digital Circuits for the radar AXIR. There are four channels, corresponding to the four squinted beams of the antenna ( Right, Left, Up and Down ). Each beam channel is processed in phase (I) and quadrature ( Q) real baseband signals. The eight video analog sign...
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