Zobrazeno 1 - 10
of 7 198
pro vyhledávání: '"pulsations"'
Autor:
J. Díaz
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-13 (2024)
Abstract The abrupt variations in the magnetic field due to the May 2024 geomagnetic storm have been recorded by broadband seismometers distributed around the world for a time interval of more than 55 h. Signals related to magnetic field variations c
Externí odkaz:
https://doaj.org/article/d4a6d418e7e64c01a904dae32a64e60c
Publikováno v:
Earthquake Science, Vol 37, Iss 5, Pp 407-414 (2024)
Among electromagnetic methods of short-term earthquake prediction, an approach is being actively developed based on the phenomenon of magnetic ultra-low-frequency (ULF) power depression occurring a few days before an earthquake. In particular, a nigh
Externí odkaz:
https://doaj.org/article/d0353a03c9214203b7aa4fc803298a44
Publikováno v:
Solar-Terrestrial Physics, Vol 10, Iss 3, Pp 97-107 (2024)
Using phase delays at spaced stations and satellite observations in the magnetosphere during two events, we have studied azimuthal propagation of resonant bursts of geomagnetic pulsations in the Pc5 range. We have also examined propagation of equival
Externí odkaz:
https://doaj.org/article/7cd99de07f4c4567adc1f6b7aeb98f74
Autor:
Johanna Tuunanen, Heta Helakari, Niko Huotari, Tommi Väyrynen, Matti Järvelä, Janne Kananen, Annastiina Kivipää, Lauri Raitamaa, Seyed-Mohsen Ebrahimi, Mika Kallio, Johanna Piispala, Vesa Kiviniemi, Vesa Korhonen
Publikováno v:
Frontiers in Neuroscience, Vol 18 (2024)
IntroductionThe cerebrospinal fluid dynamics in the human brain are driven by physiological pulsations, including cardiovascular pulses and very low-frequency (< 0.1 Hz) vasomotor waves. Ultrafast functional magnetic resonance imaging (fMRI) facilita
Externí odkaz:
https://doaj.org/article/93d72412edbf40c484e004635eb38365
Publikováno v:
Solar-Terrestrial Physics, Vol 10, Iss 3, Pp 137-146 (2024)
We analyze variations in geomagnetically induced currents (GIC) and pulsations of the geomagnetic field latitudinal By component in the frequency range 1–20 mHz. The analysis is based on the data from GIC registration at the Kola Peninsula and magn
Externí odkaz:
https://doaj.org/article/0af7717d2ce04f4a9dcd3e419ff3fc22
Autor:
Emad M. H. Takla, Ahmed Amin Khashaba
Publikováno v:
Terrestrial, Atmospheric and Oceanic Sciences, Vol 35, Iss 1, Pp 1-10 (2024)
Abstract Disturbances in the Interplanetary Magnetic Field (IMF) and solar conditions can affect the geomagnetic field measurements. In the current study, the influence of IMF and solar fluctuations on the nighttime Pc3-5 and Pi2 pulsations at low la
Externí odkaz:
https://doaj.org/article/4885d8468c92493a8a1ebf4dda1756e0
Publikováno v:
Engineering Applications of Computational Fluid Mechanics, Vol 18, Iss 1 (2024)
A high-speed multi-stage centrifugal pump building upon a transient investigation into the hydrodynamic characteristics, is conducted for 16 sets of clocking positions. The most significance of the pump head has a maximum increase of 3.6% at 0.8Qd. P
Externí odkaz:
https://doaj.org/article/c67292094b3e47529e845022e2d6273d
Autor:
Song Xue, Haolin Tian, Yongguang Cheng, Xiaoxia Hou, Ziwu Guan, Weijia Yang, Zhiyuan Wang, Zhaoning Wang, Qiyuan He
Publikováno v:
Engineering Applications of Computational Fluid Mechanics, Vol 18, Iss 1 (2024)
Hydraulic excitation causes abnormal head-cover vibration in some pump-turbines, particularly as design heads continue to rise. Pump-turbines with heads exceeding 600 m have reported such vibrations in pump mode, and it is urgent to reveal the reason
Externí odkaz:
https://doaj.org/article/5a7ca6d3115948b69e8e33d9f83973bf