Results 31 to 40 of about 34,611 (309)

Letter to the Editor
UHF electromagnetic emission stimulated by HF pumping of the ionosphere [PDF]

Annales Geophysicae, 2002
UHF electromagnetic emission (with a frequency near 600 MHz) from the F-region of the ionosphere pumped by an HF powerful radio wave is revealed. Possible mechanisms of the emission excitation, such as plasma mode con-version, scattering or Earth ...
S. M. Grach, S. M. Grach, V. M. Fridman, L. M. Lifshits, T. S. Podstrigach, E. N. Sergeev, S. D. Snegirev   +6 more
doaj   +1 more source

Gut microbiome and aging—A dynamic interplay of microbes, metabolites, and the immune system

FEBS Letters, EarlyView.
Age‐dependent shifts in microbial communities engender shifts in microbial metabolite profiles. These in turn drive shifts in barrier surface permeability of the gut and brain and induce immune activation. When paired with preexisting age‐related chronic inflammation this increases the risk of neuroinflammation and neurodegenerative diseases.
Aaron Mehl, Eran Blacher
wiley   +1 more source

Effects on the Surface and Luminescence Properties of GaAs by SF6 Plasma Passivation

Crystals, 2018
The passivation effects of the SF6 plasma on a GaAs surface has been investigated by using the radio frequency (RF) plasma method. The RF’s power, chamber pressure, and plasma treatment time are optimized by photoluminescence (PL), atomic force ...
Yumeng Xu, Xin Gao, Xiaolei Zhang, Zhongliang Qiao, Jing Zhang, Lu Zhou, Baoxue Bo   +6 more
doaj   +1 more source

Concept Study of Radio Frequency (RF) Plasma Thruster for Space Propulsion [PDF]

INCAS Bulletin, 2016
Electric thrusters are capable of accelerating ions to speeds that are impossible to reach using chemical reaction. Recent advances in plasma-based concepts have led to the identification of electromagnetic (RF) generation and acceleration systems as ...
Anna-Maria Theodora ANDREESCU, Maximilian-Vlad TEODORESCU, Jeni Alina POPESCU, Valeriu-Alexandru VILAG, Adrian STOICESCU   +4 more
doaj   +1 more source

Development of an uncompensated diagnostic for the measurement of phase-resolved characteristics in radio-frequency plasmas [PDF]

, 2007
In recent years, plasma technology has found its way into a wide and diveme array of manufacturing techniques and facilities, ranging from biomedical applications to microprocessor fabrication.
Linnane, Shane
core  

Laboratory astrophysics : investigation of planetary and astrophysical maser emission

, 2013
This paper describes a model for cyclotron maser emission applicable to planetary auroral radio emission, the stars UV Ceti and CU Virginus, blazar jets and astrophysical shocks.
Ronald K, Phelps, A.D.R., Phelps, Alan, Kellett BJ, McConville SL, Phelps ADR, Speirs DC, Ronald, Kevin, McConville, S.L., Cross, Adrian, Cairns RA, Speirs, D.C., Cairns, R Alan, Cross, A.W., Cross AW, Kellett, Barry, McConville, Sandra, Cairns, R.A., Bingham, Robert, Vorgul I, Vorgul, Irena, Kellett, B.J., Ronald, K., Bingham R, Spiers DC, Vorgul, I., Speirs, David, Bingham, R.   +27 more
core   +1 more source

Particle-in-cell simulations of electron acceleration by a simple capacitative antenna in collisionless plasma [PDF]

, 2004
We examine the electron acceleration by a localized electrostatic potential oscillating at high frequencies by means of particle‐in‐cell (PIC) simulations, in which we apply oscillating electric fields to two neighboring simulation cells.
Dieckmann, Mark E,, Shukla, P. K., Shukla, PK, Rowlands, G, Eliasson, B, Dieckmann, M. E., Rowlands, G. (George), Eliasson, Bengt   +7 more
core   +1 more source

Organizing the interface—Plasma membrane architecture and receptor dynamics in virus‐cell interactions

FEBS Letters, EarlyView.
Plasma membranes contain dynamic nanoscale domains that organize lipids and receptors. Because viruses operate at similar scales, this architecture shapes early infection steps, including attachment, receptor engagement, and entry. Using influenza A virus and HIV‐1 as examples, we highlight how receptor nanoclusters, multivalent glycan interactions ...
Jan Schlegel, Christian Sieben
wiley   +1 more source

Temporal evolution of pump beam self-focusing at the High-Frequency Active Auroral Research Program [PDF]

, 2007
On 4 February 2005 the High-Frequency Active Auroral Research Program (HAARP) facility was operated at 2.85 MHz to produce artificial optical emissions in the ionosphere while passing through the second electron gyroharmonic.
Gerken-Kendall, E., Pedersen, T., Kosch, Mike J., Mishin, E., Watkins, B., Starks, M., Oyama, S., Sentman, D.   +7 more
core  

The electron energy distribution during HF pumping, a picture painted with all colors [PDF]

, 2005
International audienceThe shape of the electron energy distribution has long been a central question in the field of high-frequency radio-induced optical emission experiments.
Rietveld, Michael T., Kosch, M.J., H. Holma, Aso, T., Grydeland, T., K. Kaila, P. Gallop, Gustavsson, B., Leyser, T.B., M. T. Rietveld, B. Isham, B. U. E. Brändström, Kaila, K., J. Jussila, Å. Steen, Steen, Å., Leyser, T. B., LaHoz, C., T. B. Leyser, Grydeland, Tom, Isham, B., Brändström, B.U.E., C. LaHoz, M. Ejiri, Sergienko, T., Rietveld, M. T., Ejiri, M., B. Gustavsson, Kosch, M. J., Gallop, P., M. J. Kosch, T. Aso, Brändström, B. U. E., La Hoz, Cesar, Jussila, J., Holma, H., T. Grydeland, T. Sergienko   +37 more
core   +1 more source