Results 1 to 10 of about 373,441 (291)

Twisted radio waves and twisted thermodynamics. [PDF]

PLoS One, 2013
We present and analyze a gedanken experiment and show that the assumption that an antenna operating at a single frequency can transmit more than two independent information channels to the far field violates the Second Law of Thermodynamics. Transmission
Kish LB, Nevels RD.
europepmc   +3 more sources

A phenomenological comparison of the effects of blue light, red light and radio waves on the escape speed of Caenorhabditis elegans and the rate of closure of Gerbera jamesonii petals. [PDF]

PLoS ONE
ObjectiveGreat interest surrounds understanding the effects of radio waves on biological organisms, including humans, animals and plants. Several prior studies, however, showed contradictory results.
Alexander W Kline, Charles S Beattie, Addison K Shenk, Samuel I Spicher, Timothy A Bloss, Laura Tipton, Marquis T Walker, Laura G Vallier, Kristopher L Schmidt, Giovanna Scarel   +9 more
doaj   +2 more sources

Atmospheric drag effects on modelled low Earth orbit (LEO) satellites during the July 2000 Bastille Day event in contrast to an interval of geomagnetically quiet conditions [PDF]

Annales Geophysicae, 2021
In this work, we simulated the atmospheric drag effect on two model SmallSats (small satellites) in low Earth orbit (LEO) with different ballistic coefficients during 1-month intervals of solar–geomagnetic quiet and perturbed conditions. The goal of this
V. U. J. Nwankwo, W. Denig, S. K. Chakrabarti, M. P. Ajakaiye, J. Fatokun, A. W. Akanni, J.-P. Raulin, E. Correia, E. Correia, J. E. Enoh, P. I. Anekwe   +10 more
doaj   +1 more source

Tunable triple-band millimeter-wave absorbing metasurface based on nematic liquid crystal

AIP Advances, 2022
We propose and design a tunable triple-band millimeter-wave absorbing metasurface based on nematic liquid crystal (NLC). Numerical results based on both effective circuit model and full-wave simulations verify the triple-band absorption property.
Qiang Wang, Yuan Ke Liu, Gui Chen Wang, Wei Xiang Jiang, Tie Jun Cui   +4 more
doaj   +1 more source

3D complex envelope leapfrog ADI‐FDTD algorithm

Electronics Letters, 2021
This paper presents a 3D complex envelope leapfrog alternating‐direction‐implicit finite‐difference time‐domain method. Compared with the previous work, the proposed method costs less computation runtime and memory while maintaining similar accuracy. The
Yunyang Dong, Jianyi Zhou
doaj   +1 more source

Dynamo effects in gravity [PDF]

E3S Web of Conferences, 2019
Nonlinear oscillations in the dynamic system of gravitational and material fields are considered. The problems of singularities and caustics in gravity, expansion and baryon asymmetry of the Universe, wave prohibition of collapse into black holes, and ...
Shevtsov Boris
doaj   +1 more source

Joint Modulations of Electromagnetic Waves and Digital Signals on a Single Metasurface Platform to Reach Programmable Wireless Communications

Engineering, 2022
In current wireless communication and electronic systems, digital signals and electromagnetic (EM) radiation are processed by different modules. Here, we propose a mechanism to fuse the modulation of digital signals and the manipulation of EM radiation ...
Xiang Wan, Chaokun Xiao, He Huang, Qiang Xiao, Wei Xu, Yueheng Li, Joerg Eisenbeis, Jiawei Wang, Ziai Huang, Qiang Cheng, Shi Jin, Thomas Zwick, Tiejun Cui   +12 more
doaj   +1 more source

Analysis of geomagnetic disturbances dynamics during increased solar activity and magnetic storms (according to the measurements of INTERMAGNET station network) [PDF]

E3S Web of Conferences, 2019
We present and describe an automated method for analysis of magnetic data and for detection of geomagnetic disturbances based on wavelet transformation.
Mandrikova Oksana, Rodomanskay Anastasia, Zaitsev Alexander   +2 more
doaj   +1 more source

Structure of the auroral precipitation region in the dawn sector: relationship to convection reversal boundaries and field-aligned currents [PDF]

Annales Geophysicae, 2001
. Simultaneous DMSP F7 and Viking satellite measurements of the dawnside high-latitude auroral energy electron and ion precipitation show that the region of the low and middle altitude auroral precipitation consists of three characteristic plasma ...
Y. I. Feldstein, L. I. Gromova, J. Woch, I. Sandahl, L. Blomberg, G. Marklund, C.-I. Meng   +6 more
doaj   +1 more source

Auroral electrojet dynamics during magnetic storms, connection with plasma precipitation and large-scale structure of the magnetospheric magnetic field [PDF]

Annales Geophysicae, 1999
Effect of the equatorward shift of the eastward and westward electrojets during magnetic storms main phase is analyzed based on the meridional chains of magnetic observatories EISCAT and IMAGE and several Russian observatories (geomagnetic longitude ...
Y. I. Feldstein, L. I. Gromova, A. Grafe, C.-I. Meng, V. V. Kalegaev, I. I. Alexeev, Y. P. Sumaruk   +6 more
doaj   +1 more source