Results 171 to 180 of about 5,624 (239)

A Two-for-One Diagnosis: A Rare Case of Chronic Abdominal Pain Caused by Gastroptosis and Wilkie's Syndrome in a Young Woman. [PDF]

Diagnostics (Basel)
Youssoufi N, Jaafari A, Mansour S, El Hamdi M, Gallerani A, Pierrakos C, Attou R.   +6 more
europepmc   +1 more source

Unilateral Facial Swelling as the Inaugural Sign of Anti-NPX2 Dermatomyositis: A Diagnostic Challenge in Oral Medicine. [PDF]

Case Rep Dent
Tilotta F, Le Vayer H, Bory O, Morbieu C, Radoi L.   +4 more
europepmc   +1 more source

A case of septic arthritis of the manubriosternal and chondrosternal joints. [PDF]

Clin Case Rep
Randrianarisoa RMF, Andrianiaina AM, Radinasoa RP, Vololontiana HMD.   +3 more
europepmc   +1 more source

An Atlas of oblique-incidence ionograms

, 1959
openaire   +1 more source

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Application of the oblique ionogram as vertical ionogram

Science China Technological Sciences, 2012
The vertical ionogram can provide the important ionospheric parameters, such as critical frequency, virtual height and electron density, for ionospheric research. The oblique ionosonde has the ability to detect the ionosphere over sea and other terrain where it is not practical to deploy vertical sounder and provide more ionograms with less ...
Gang Chen, ZhengYu Zhao, YuanNong Zhang, GuoBin Yang, Chen Zhou, Shuo Huang, Ting Li, Ning Li, HengQing Sun   +8 more
openaire   +2 more sources

Multi‐Scale Attention‐Enhanced Deep Learning Model for Ionogram Automatic Scaling

Radio Science, 2023
To increase the accuracy of ionogram automatic scaling, a deep learning model—multi‐scale attention‐enhanced UNet is proposed. Correspondingly, a multi‐scale attention‐enhanced (MSAE) sub‐network is developed which involves a spatial attention nearest up‐
Li Guo, J. Xiong
semanticscholar   +1 more source

Ionogram Echo Extraction Based on the Convolutional Neural Networks

Radio Science, 2022
The extraction of ionospheric echo plays a key role in the research of radio wave propagation theory and is the basis of the design, application, and test of the radio engineering system.
J. Xue, C. Zhang, B. Yin, X. Jia, J. Xu, M. Ma   +5 more
semanticscholar   +1 more source

A Simple Method for Visualizing the NVIS Open Channel Based on Ionogram

2021 IEEE USNC-URSI Radio Science Meeting (Joint with AP-S Symposium), 2021
To guarantee the success of radio wave propagation, the determination of carrier frequency (fc) in Near Vertical Incidence Skywave (NVIS) communication system is based on the information of ionosphere opening channel that varies over time.
V. Dear, A. Kurniawan, Iskandar, P. Abadi, R. Pradipta   +4 more
semanticscholar   +1 more source

Investigation of Satellite Trace (ST) and Multi-reflected Echo (MRE) ionogram signatures and its possible correlation to nighttime spread F development from Cyprus over the solar mini-max (2009–2016)

, 2021
Multi-reflected echoes (MREs) and satellite traces (STs) are referred in literature as ionogram signatures of Travelling Ionospheric Disturbances (TIDs) which is a phenomenon that apparently drives spread F development mainly at nighttime mid-latitude ...
K. Paul, H. Haralambous, C. Oikonomou, A. Paul   +3 more
semanticscholar   +1 more source