Results 31 to 40 of about 127,445,565 (301)
First Sagittarius A* Event Horizon Telescope Results. IV. Variability, Morphology, and Black Hole Mass [PDF]
, 2023 In this paper we quantify the temporal variability and image morphology of the horizon-scale emission from Sgr A*, as observed by the EHT in 2017 April at a wavelength of 1.3 mm.
The Event Horizon Telescope Collaboration
core +1 more source
The KJH: Sailing over the horizon [PDF]
The Korean Journal of Hematology, 2010 On March 31, 2010, the first English issue of the Korean Journal of Hematology (KJH) was published and dispatched to overseas libraries and domestic readers. It was the emotional zenith of my editorial career. At last, the KJH has been reborn as an international journal to fulfill our mission of delivering new and important scientific knowledge and ...
openaire +2 more sources
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
Probability-guaranteed H∞ finite-horizon filtering for a class of nonlinear time-varying systems with sensor saturations [PDF]
, 2012 This is the Post-Print version of the Article. The official published version can be accessed from the link below - Copyright @ 2012 ElsevierIn this paper, the probability-guaranteed H∞ finite-horizon filtering problem is investigated for a class of ...
Wang, Z, Stergioulas, LK, Hu, J, Gao, H
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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
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
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
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
Therapeutic Apheresis and Dialysis, EarlyView.ABSTRACT Background Japan has one of the highest dialysis prevalence rates worldwide and a shrinking, aging population. Whether dialysis burden has entered a sustained post‐peak phase or whether recent declines partly reflect pandemic‐related disruptions remains uncertain.
Hatice Şahin +2 more
wiley +1 more source