Results 31 to 40 of about 92,637,410 (303)
First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole [PDF]
, 2019 We present the first Event Horizon Telescope (EHT) images of M87, using observations from April 2017 at 1.3 mm wavelength. These images show a prominent ring with a diameter of ∼40 μas, consistent with the size and shape of the lensed photon orbit ...
Sasada, Mahito +1 more
core +2 more sources
Numerical Modeling of the Radio Wave Over-the-Horizon Propagation in the Troposphere
Atmosphere, 2022 Using atmospheric data, which include pressure, temperature, relative humidity and water vapor pressure, the actual refractive index of a specific segment of the atmosphere has been modeled.
Min Xu +6 more
doaj +1 more source
Index on Censorship, 1996 The oil must flow...and human rights and democracy are the price to be paid for security and stability In the Gulf. But for how long?
openaire +1 more source
First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring [PDF]
, 2019 The Event Horizon Telescope (EHT) has mapped the central compact radio source of the elliptical galaxy M87 at 1.3mm with unprecedented angular resolution. Here we consider the physical implications of the asymmetric ring seen in the 2017 EHT data.
Sasada, Mahito +1 more
core +1 more source
A Real-Time Detection Method of Atmospheric Duct Based on AIS [PDF]
Hangkong bingqiIn the process of conducting the atmospheric waveguide transmission characteristic test in the sea area, it is found that whether the over-the-horizon ships can be detected by the Automatic Identification System (AIS) has a great correlation with the ...
Liu Bodong, Ma Yueliang, Dong Zhen, Zhang Yaochun
doaj +1 more source
Известия высших учебных заведений России: Радиоэлектроника, 2019 Introduction. It has been previously reported that small-scale irregularities (SSI) in the polar ionosphere are elongated along the magnetic field and anisotropic in its cross-field direction.
Valery A. Panchenko +2 more
doaj +1 more source
First M87 Event Horizon Telescope Results. III. Data Processing and Calibration [PDF]
, 2019 We present the calibration and reduction of Event Horizon Telescope (EHT) 1.3 mm radio wavelength observations of the supermassive black hole candidate at the center of the radio galaxy M87 and the quasar 3C 279, taken during the 2017 April 5–11 ...
Sasada, Mahito +1 more
core +1 more source
Method for TDOA localisation in over-the-horizon environments
The Journal of Engineering, 2019 Here, the authors propose a new over-the-horizon time-difference-of-arrival localisation model based on the ground-wave and simultaneously put forward a modified semi-definite programming algorithm, which is called Ground-wave semi-definite programming ...
Jian-Xin Liu, Xing-Peng Mao
doaj +1 more source
HF Radar Signatures and Their Use for Target Classification, Recognition and Identification
SensorsThe challenging goal of equipping HF radars with a target classification ability has been pursued for many years, yet no satisfactory system-level methodology has been reported.
Stuart Anderson
doaj +1 more source
FEBS Letters, EarlyView.We identified a systemic, progressive loss of protein S‐glutathionylation—detected by nonreducing western blotting—alongside dysregulation of glutathione‐cycle enzymes in both neuronal and peripheral tissues of Taiwanese SMA mice. These alterations were partially rescued by SMN antisense oligonucleotide therapy, revealing persistent redox imbalance as ...
Sofia Vrettou, Brunhilde Wirth
wiley +1 more source