Results 11 to 20 of about 9,731 (202)

Spread F occurrence and drift under the crest of the equatorial ionization anomaly from continuous Doppler sounding and FORMOSAT-3/COSMIC scintillation data [PDF]

Earth, Planets and Space, 2016
يتم تطبيق طريقة جديدة نسبيًا تعتمد على القياسات بواسطة سبر دوبلر المستمر متعدد النقاط لدراسة معدل الحدوث وسرعات الانتشار واتجاهات هياكل F المنتشرة فوق توكومان وشمال الأرجنتين وتايوان، وكلاهما كان تحت ذروة شذوذ التأين الاستوائي في عام 2014. بالإضافة إلى ذلك، تتم دراسة انتشار F على مستوى العالم خلال نفس الفترة الزمنية من مؤشر وميض S4 المقاس على متن القمر
Jaroslav Chum, Jann‐Yenq Liu, Shih‐Ping Chen, M.A. Cabrera, Jan Laštovička, Jiří Baše, Dalia Burešová, J. Fišer, František Hruška, R.G. Ezquer   +9 more
openaire   +5 more sources

Increased inspiratory resistance affects the dynamic relationship between blood pressure changes and subarachnoid space width oscillations. [PDF]

PLoS ONE, 2017
Respiration is known to affect cerebrospinal fluid (CSF) movement. We hypothesised that increased inspiratory resistance would affect the dynamic relationship between blood pressure (BP) changes and subarachnoid space width (SAS) oscillations.Experiments
Magdalena Wszedybyl-Winklewska, Jacek Wolf, Ewa Swierblewska, Katarzyna Kunicka, Kamila Mazur, Marcin Gruszecki, Pawel J Winklewski, Andrzej F Frydrychowski, Leszek Bieniaszewski, Krzysztof Narkiewicz   +9 more
doaj   +1 more source

Multiscale Characteristics of Two Supercell Tornados of Heilongjiang in 2021

应用气象学报, 2022
Two strong supercell tornados hit Shangzhi Acheng of Harbin and Meilisi of Qiqihar, Heilongjiang Province on 1 June ("6·1" Tornado) and 9 June ("6·9" Tornado) in 2021. Using the conventional meteorological observations and Doppler weather radar data, the
Xu Yue, Shao Meirong, Tang Kai, Zhang Libao, Du Jing, Wang Yongchao   +5 more
doaj   +1 more source

An overview of methodologies for real-time detection, characterisation and tracking of traveling ionospheric disturbances developed in the TechTIDE project

Journal of Space Weather and Space Climate, 2020
The main objective of the TechTIDE project (warning and mitigation technologies for travelling ionospheric disturbances effects) is the development of an identification and tracking system for travelling ionospheric disturbances (TIDs) which will issue ...
Belehaki Anna, Tsagouri Ioanna, Altadill David, Blanch Estefania, Borries Claudia, Buresova Dalia, Chum Jaroslav, Galkin Ivan, Juan José Miguel, Segarra Antoni, Timoté Cristhian Camilo, Tziotziou Kostas, Verhulst Tobias G. W., Watermann Jurgen   +13 more
doaj   +1 more source

Sympathetic Activation Does Not Affect the Cardiac and Respiratory Contribution to the Relationship between Blood Pressure and Pial Artery Pulsation Oscillations in Healthy Subjects. [PDF]

PLoS ONE, 2015
Using a novel method called near-infrared transillumination backscattering sounding (NIR-T/BSS) that allows for the non-invasive measurement of pial artery pulsation (cc-TQ) and subarachnoid width (sas-TQ) in humans, we assessed the influence of ...
Pawel J Winklewski, Yurii Tkachenko, Kamila Mazur, Jacek Kot, Marcin Gruszecki, Wojciech Guminski, Krzysztof Czuszynski, Jerzy Wtorek, Andrzej F Frydrychowski   +8 more
doaj   +1 more source

Measurement-based analysis of Doppler characteristics for ultra-wideband radio channels in an office environment [PDF]

, 2014
In this work, an analysis of the Doppler characteristics for Ultra-Wideband indoor communication is presented. Channel sounding measurements ranging from 3.1 to 10.6 GHz were performed over the course of several days in an occupied office environment ...
Hanssens, Brecht, Joseph, Wout, Martens, Luc, Oestges, Claude, Tanghe, Emmeric   +4 more
core   +1 more source

A Software-Defined Channel Sounder for Industrial Environments with Fast Time Variance [PDF]

, 2018
Novel industrial wireless applications require wideband, real-time channel characterization due to complex multipath propagation. Rapid machine motion leads to fast time variance of the channel's reflective behavior, which must be captured for radio ...
Block, Dimitri, Fliedner, Niels Hendrik, Meier, Uwe   +2 more
core   +3 more sources

Observations of traveling ionospheric disturbances driven by gravity waves from sources in the upper and lower atmosphere [PDF]

Annales Geophysicae
The observed traveling ionospheric disturbances (TIDs) are attributed to atmospheric gravity waves generated by auroral sources in the lower thermosphere or gravity waves generated in the troposphere by midlatitude weather systems.
P. Prikryl, D. R. Themens, D. R. Themens, J. Chum, S. Chakraborty, R. G. Gillies, J. M. Weygand   +6 more
doaj   +1 more source

The Impact of Acoustic Imaging Geometry on the Fidelity of Seabed Bathymetric Models [PDF]

, 2018
Attributes derived from digital bathymetric models (DBM) are a powerful means of analyzing seabed characteristics. Those models however are inherently constrained by the method of seabed sampling. Most bathymetric models are derived by collating a number
Hughes Clarke, John E.
core   +4 more sources

Ground-based measurements of ionospheric dynamics

Journal of Space Weather and Space Climate, 2018
Different methods are used to research and monitor the ionospheric dynamics using ground measurements: Digisonde Drift Measurements (DDM) and Continuous Doppler Sounding (CDS).
Kouba Daniel, Chum Jaroslav
doaj   +1 more source