Results 31 to 40 of about 70,591 (246)

Parameters of traveling ionospheric disturbances: results from spaced oblique HF sounding

Вісник Харківського національногоуніверситету імені В.Н. Каразіна. Серія: Радіофізика та електроніка, 2022
Urgency. A characteristic feature of the ionospheric radio channel is that its parameters depend on season, local time, solar activity, geographic coordinates, the state of the sun, the state of atmospheric-space weather, etc. The state of the atmosphere
L. F. Chernogor, K. P. Garmash, Q. Guo, Y. H. Zhdanko, V. F. Pushin, A. M. Tsymbal, Yu. Zheng   +6 more
doaj   +1 more source

Traveling wave packets of total electron content disturbances as deduced from global GPS network data

, 2002
We identified a new class of mid-latitude medium-scale traveling ionospheric disturbances (MS TIDs), viz. traveling wave packets (TWPs) of total electron content (TEC) disturbances.
Afraimovich, Afraimovich, Afraimovich, Afraimovich, Afraimovich, Afraimovich, Afraimovich, Afraimovich, Afraimovich, Afraimovich, Al'perovich, Baker, Bertin, Bertin, Davies, Davies, Duffus, E.L. Afraimovich, Francis, Hines, Hines, Hocke, Hung, Jacobson, Jacobson, Kalikhman, Kersly, Klobuchar, Klostermeyer, Mannucci, Mercier, Mercier, N.P. Perevalova, Okuzawa, Oliver, Otsuka, Rishbeth, S.V. Voyeikov, Saito, Saito, Shan, Shiokawa, Skone, Skone, Somsikov, Spoelstra, Stobie, Velthoven, Waldock, Waldock, Waldock, Yakovets   +51 more
core   +1 more source

Investigation of Acoustic Waves in the Ionosphere Generated by a Deep Convection System Using Distributed Networks of GPS Receivers and Numerical Modeling

Geophysical Research Letters, 2018
Acoustic waves generated in the lower atmosphere may become an important source of variability in the upper atmosphere. Although excited with small amplitudes compared to gravity waves, they are minimally subjected to viscous dissipation and may reach ...
Irfan Azeem, Richard L. Walterscheid, Geoff Crowley   +2 more
doaj   +1 more source

Fully 3D‐Printed Wave‐Wound Electromagnetic Motors

Advanced Materials Technologies, EarlyView.
This work presents the first fully 3D‐printed wave‐wound electromagnetic motors, which are created using conductive nanoparticle inks, carbon‐filled nylon polymers, and surface mount components. These motors can achieve a stall torque of 7.62N·mmA−1$7.62 \nobreakspace N{\cdot }mm A^{-1}$ and efficiency of 28.2 %, which approaches the performance of ...
Joseph Schwalbe, Sebastian Mettes, Eduardo Francke, Kenneth W. Allen, Yi Chen Mazumdar   +4 more
wiley   +1 more source

Wake and wave resistance on viscous thin films

, 2016
The effect of an external pressure disturbance, being displaced with a constant speed along the free surface of a viscous thin film, is studied theoretically in the lubrication approximation in one- and two-dimensional geometries.
Benzaquen, Michael, Ledesma-Alonso, René, Raphaël, Elie, Salez, Thomas   +3 more
core   +3 more sources

Gravity Rate of Change Due to Slow Tectonics: Insights from Numerical Modeling

Geosciences
Gravity anomalies caused by tectonics are commonly assumed to be static, based on the argument that the motions are slow enough for the induced mass changes over time to be negligible.
Anna Maria Marotta, Valeria Fedeli, Alessandro Regorda, Roberto Sabadini   +3 more
doaj   +1 more source

Collision‐Resilient Winged Drones Enabled by Tensegrity Structures

Advanced Robotics Research, EarlyView.
Based on structures of birds such as the woodpeck, this article presents the collision‐resilient aerial robot, SWIFT. SWIFT leverages tensegrity structures in the fuselage and wings which allow it to undergo large deformations in a crash, without sustaining damage. Experiments show that SWIFT can reduce impact forces by 70% over conventional structures.
Omar Aloui, Raphael Zufferey, William Stewart, Mohammad Askari, Simon Jeger, Dario Floreano   +5 more
wiley   +1 more source

Modeling and position control of a new quad-rotor unmanned aerial vehicle with tilt-wing mechanism [PDF]

, 2008
In this work a dynamic model of a new quadrotor aerial vehicle that is equipped with a tilt-wing mechanism is presented. The vehicle has the capabilities of vertical take-off/landing (VTOL) like a helicopter and flying horizontal like an airplane ...
Aksit, Mahmut Faruk, Akşit, Mahmut Faruk, Cetinsoy, Ertugrul, Gulez, Kayhan, Gülez, Kayhan, Kandemir, İlyas, Kandemir, Ilyas, Oner, Kaan Taha, Unel, Mustafa, Çetinsoy, Ertuğrul, Öner, Kaan Taha, Ünel, Mustafa   +11 more
core  

Capillary-Gravity Waves on Depth-Dependent Currents: Consequences for the Wave Resistance

, 2011
We study theoretically the capillary-gravity waves created at the water-air interface by a small two-dimensional perturbation when a depth-dependent current is initially present in the fluid. Assuming linear wave theory, we derive a general expression of
Benzaquen M., Browaeys J., Chevy F., Darrigol O., E. Raphaël, Lamb H., Landau L. D., Lighthill J., M. Benzaquen, Margaretha H., Richard D.   +10 more
core   +1 more source

An investigation of how radiation may cause accelerated rates of tropical cyclogenesis and diurnal cycles of convective activity [PDF]

Atmospheric Chemistry and Physics, 2015
Recent cloud-resolving numerical modeling results suggest that radiative forcing causes accelerated rates of tropical cyclogenesis and early intensification.
M. E. Nicholls
doaj   +1 more source