Results 41 to 50 of about 413,548 (214)

HF echo types revisited: aspect angle attenuation effects [PDF]

Annales Geophysicae, 2009
The high-spatial-resolution observations of the auroral E-region echoes by the Super Dual Auroral Radar Network (SuperDARN) HF radar at Pykkvibaer, Iceland considered in a previous study are re-examined. Both the spectral power and Doppler velocity of
R. A. Makarevich, B. A. Carter
doaj   +1 more source

HF doppler observations on the occurrence of equatorial spread-F

Journal of Earth System Science, 1985
HF doppler observations of the vertical drift velocity and group height of the 5.5 MHz plasma frequency level of the post-sunset bottomside F-region obtained on a fewESF (equatorial spread-F) and non-ESF days at Trivandrum are presented. The results show that on the non-ESF days, the maximum group height attained is about 400 km and the maximum ...
B. T. Vikram Kumar, P. Velayudhan Nair, P. B. Rao   +2 more
openaire   +1 more source

Characterizing ionospheric variability through HF Doppler measurements: a statistical and numerical ray tracing analysis

Frontiers in Astronomy and Space Sciences
High-frequency (HF) skywave propagation relies on the ionosphere, making it susceptible to ionospheric variability. This study analyzes long-term Doppler residual measurements of a 10 MHz HF link between Fort Collins, CO, and Newark, NJ, to characterize ...
Sabastian Fernandes, Gareth W. Perry, Tiago Trigo, Nathaniel A. Frissell, John Gibbons, Kristina Collins   +5 more
doaj   +1 more source

The Deubiquitinase UCHL1 Drives Susceptibility to Atrial Fibrillation by Stabilizing CaMKII‐δ

Advanced Science, EarlyView.
UCHL1 is highly upregulated in mice and patients with AF. UCHL1 directly binds to and removes K48‐linked polyubiquitin chains from CaMKII‐δ at K251 and enhances CaMKII‐δ stability, which activates RyR2, disrupts Ca2+ handling, and promotes AF. These findings establish UCHL1 as a critical regulator of CaMKII‐δ stability and AF‐related Ca2+ handling ...
Hai‐Lian Bi, Yu‐Hui Gu, Kai‐Wen Ren, Xiao‐Hong Yu, Yun‐Long Xia, Xiao‐Lei Yang, Hui‐Hua Li   +6 more
wiley   +1 more source

Nightside studies of coherent HF radar spectral width behaviour [PDF]

, 2002
A previous case study found a relationship between high spectral width measured by the CUTLASS Finland HF radar and elevated electron temperatures observed by the EISCAT and ESR incoherent scatter radars in the post-midnight sector of magnetic local time.
J. A. Davies, Davies, J.A., Eglitis, P., P. Eglitis (7605143), P. Eglitis, Woodfield, E.E., Lester, M., Lockwood, M., Lockwood, Mike, M. Lester, J. A. Davies (4412452), T. K. Yeoman (7601525), T. K. Yeoman, M. Lester (7589660), Davies, J. A., M. Lockwood, M. Lockwood (7612331), E. E. Woodfield (7590071), E. E. Woodfield, Yeoman, T. K., Yeoman, T.K., Woodfield, E. E.   +21 more
core   +2 more sources

Diastolic dysfunction and diastolic heart failure: diagnostic, prognostic and therapeutic aspects

Cardiovascular Ultrasound, 2005
Left ventricular (LV) diastolic dysfunction (DD) and diastolic heart failure (HF), that is symptomatic DD, are due to alterations of myocardial diastolic properties. These alterations involve relaxation and/or filling and/or distensibility.
Galderisi Maurizio
doaj   +1 more source

ALDH2 Deficiency Promotes Mitochondrial Oxidative Stress and Adverse Limb Outcomes via VDAC–HSP60 Signaling

Advanced Science, EarlyView.
ALDH2 deficiency promotes 4‐HNE accumulation, resulting in covalent modification of HSP60, disruption of its oligomeric assembly, and VDAC1‐dependent release of HSP60 from mitochondria to the cytosol. Pharmacological activation of ALDH2 preserves HSP60 proteostasis and mitochondrial integrity, whereas the clinical association between the ALDH2 rs671 ...
You‐Cheng Lin, Nan‐Chun Wu, Chon‐Seng Hong, Po‐Chao Hsu, Wen‐Jin Yang, Yi‐Cheng Chang, Che‐Hong Chen, Wei‐Ting Chang   +7 more
wiley   +1 more source

Interhemispheric comparison of spectral width boundary as observed by the SuperDARN radars [PDF]

, 2003
International audiencePrevious studies have shown that dayside equatorward edge of coherent HF radar backscatter having broad Doppler spectral width is coincident with the equatorward edge of the cusp particle precipitation.
Milan, S. E., N. Sato, T. Iyemori, T. Iyemori (7616135), Woodfield, E.E., Lester, M., A. S. Yukimatu, A. S. Yukimatu (7614353), M. Lester, N. Sato (7606136), Milan, S.E., M. Lester (7589660), K. Hosokawa, S. E. Milan, Yukimatu, A. S., Iyemori, T., K. Hosokawa (7606139), Hosokawa, K., E. E. Woodfield (7590071), E. E. Woodfield, Sato, N., Yukimatu, A.S., S. E. Milan (7594526), Woodfield, E. E.   +23 more
core   +2 more sources

Silk Fibroin for Cardiovascular Medical Devices: Review of Material Properties, Applications, and Clinical Potential

Advanced NanoBiomed Research, EarlyView.
Silk fibroin is an attractive natural biomaterial that can be engineered into diverse cardiovascular constructs, including vascular grafts, cardiac patches, heart valves, and stent coatings. Its tunable biological and mechanical properties have driven substantial preclinical progress; however, widespread clinical translation in cardiovascular ...
Mahsa Haghighattalab, Matt Govendir, Kristina Andelovic, Zachary Och, Fatemeh Karimi, Munira Xaymardan, Tomasz Jungst, Jelena Rnjak‐Kovacina, Nona Farbehi   +8 more
wiley   +1 more source

Self‐Assembled Telecom Color Centers in Silicon and Their Growth Environment

Advanced Physics Research, EarlyView.
Influence of the growth pressure during the formation of self‐assembled color centers in silicon grown by molecular beam epitaxy at ultra‐low temperatures on the color center's photoluminescence spectral signature. The growth pressure crucially determines color center selectivity, as evidenced by G‐centers, W‐centers, and T‐centers, matrix purity, and ...
Jacqueline Marböck, Enrique Prado Navarrete, Merve Karaman, Oliver E. Lang, S. Mijatovic, Thomas Fromherz, Maciej O. Liedke, Andreas Wagner, Moritz Brehm, Johannes Aberl   +9 more
wiley   +1 more source