Results 31 to 40 of about 413,548 (214)

Renal Venous Stasis Index Reflects Renal Congestion and Predicts Adverse Outcomes in Patients With Heart Failure

Frontiers in Cardiovascular Medicine, 2022
BackgroundIt has been recently reported that the renal venous stasis index (RVSI) assessed by renal Doppler ultrasonography provides information to stratify pulmonary hypertension that can lead to right-sided heart failure (HF).
Himika Ohara, Akiomi Yoshihisa, Akiomi Yoshihisa, Yuko Horikoshi, Yuko Horikoshi, Shinji Ishibashi, Mitsuko Matsuda, Yukio Yamadera, Yukiko Sugawara, Yasuhiro Ichijo, Yu Hotsuki, Koichiro Watanabe, Yu Sato, Tomofumi Misaka, Takashi Kaneshiro, Masayoshi Oikawa, Atsushi Kobayashi, Yasuchika Takeishi   +17 more
doaj   +1 more source

High-latitude observations of impulse-driven ULF pulsations in the ionosphere and on the ground [PDF]

, 2003
International audienceWe report the simultaneous observation of 1.6?1.7 mHz pulsations in the ionospheric F-region with the CUTLASS bistatic HF radar and an HF Doppler sounder, on the ground with the IMAGE and SAMNET magnetometer arrays, and in the ...
Menk, F. W., Lester, M., Honary, F., Wright, D. M., F. W. Menk, M. Lester, T. K. Yeoman (7601525), F. Honary (7604621), T. K. Yeoman, M. Lester (7589660), D. M. Wright (7583069), D. M. Wright, F. Honary, F. W. Menk (7675571), Yeoman, T. K.   +14 more
core   +2 more sources

Medium-scale traveling ionospheric disturbances over Taiwan observed with HF Doppler sounding

Earth, Planets and Space, 2017
We analyzed horizontal velocities of medium-scale traveling ionospheric disturbances using HF Doppler sounding over Taiwan from January 2014 to January 2016.
Jiří Fišer, Jaroslav Chum, Jann-Yenq Liu   +2 more
doaj   +1 more source

An interhemispheric, statistical study of nightside spectral width distributions from coherent HF scatter radars [PDF]

, 2002
International audienceA statistical investigation of the Doppler spectral width parameter routinely observed by HF coherent radars has been conducted between the Northern and Southern Hemispheres for the nightside ionosphere.
Milan, S. E., N. Sato, Woodfield, E.E., Lester, M., M. Lester, N. Sato (7606136), Milan, S.E., M. Lester (7589660), K. Hosokawa, S. E. Milan, K. Hosokawa (7606139), Hosokawa, K., E. E. Woodfield (7590071), E. E. Woodfield, Sato, N., S. E. Milan (7594526), Woodfield, E. E.   +16 more
core   +2 more sources

Systolic Myocardial Velocity by Tissue Doppler Imaging versus Left Ventricular Ejection Fraction by Simpson’s Method in Yemeni Patients with Heart Failure

Yemeni Journal for Medical Sciences, 2019
Objective: To compare between systolic myocardial velocity (Sm) by tissue Doppler imaging (TDI) and left ventricular ejection fraction (LVEF) by Simpson’s method in Yemeni patients with heart failure (HF).
Faida Obeid
doaj   +1 more source

Significance of Tissue Doppler Echocardiography-Based Dispersion Index of Myocardial Velocities in the Differentiation of Ischemic and Nonischemic Cardiomyopathy: A Novel Echocardiographic Parameter

Journal of the Indian Academy of Echocardiography & Cardiovascular Imaging, 2020
Background: Tissue Doppler imaging (TDI) echocardiography, an objective method for the quantification of left ventricular (LV) function, can detect subtle alterations in contractility both in rest and stress echocardiography. Aim: The study aims were to (
Narra Sandeep, Otikunta Adikesava Naidu, Ravi Srinivas, Nagula Praveen, Parvathareddy Krishna Malakonda Reddy   +4 more
doaj   +1 more source

Time-Varying Ocean-Like Surface Scattering at Grazing Incidence: Numerical Analysis of Doppler Spectrum at HF/VHF/UHF Bands

International Journal of Antennas and Propagation, 2019
This paper numerically analyzes the characteristics of the Doppler spectrum at HF/VHF/UHF bands from 1D time-varying ocean-like surfaces at grazing incidence in vertical polarization mode.
Yidong Hou, Biyang Wen, Caijun Wang, Yonghuai Yang   +3 more
doaj   +1 more source

Extraction of the significant wave height from synthetic HF radar data acquired on a floating platform

IET Radar, Sonar & Navigation, 2023
The usual procedure for extracting ocean surface information from data acquired from a high‐frequency surface wave radar transmitting from a floating platform is to first compensate for the motion of the antenna in the acquired motion‐contaminated ...
Sepideh Hashemi, Reza Shahidi, Eric W. Gill   +2 more
doaj   +1 more source

Tissue Doppler derived biphasic velocities during the pre and post-ejection phases: patterns, concordance and hemodynamic significance in health and disease

Cardiovascular Ultrasound, 2022
Background Pre-(PRE) and post-ejection (POE) velocities by mitral annular tissue Doppler (TD) are biphasic and may be related to myocardial deformations.
Alaa Mabrouk Salem Omar, Diana Maria Ronderos Botero, Javier Arreaza Caraballo, Ga Hee Kim, Yeraz Khachatoorian, Jaclyn Kliewer, Mohamed Ahmed Abdel Rahman, Osama Rifaie, Jonathan N. Bella, Edgar Argulian, Johanna Contreras   +10 more
doaj   +1 more source

Investigation of the relationship between optical auroral forms and HF radar E region backscatter [PDF]

, 2000
International audienceThe SuperDARN HF radars have been employed in the past to investigate the spectral characteristics of coherent backscatter from L-shell aligned features in the auroral E region.
Milan, S. E., N. Sato, Lester, M., H. Takizawa (7612496), Villain, J.-P., J. -p. Villain, Takizawa, H., M. Lester, N. Sato (7606136), Milan, S.E., S. E. Milan, Stephen E. Milan (7612220), J. P. Villain (7612424), J.-P. Villain, Mark Lester (6477935), Sato, N., H. Takizawa   +16 more
core   +2 more sources