Results 101 to 110 of about 4,057 (212)

Subsurface sounders [PDF]

Airborne or spaceborne electromagnetic systems used to detect subsurface features are discussed. Data are given as a function of resistivity of ground material, magnetic permeability of free space, and angular frequency.

core   +1 more source

Wideband and Multifrequency Square Spiral Microstrip Patch Antenna

International Journal of Innovative Research in Computer and Communication Engineering, 2015
This paper describes the analysis and design of a class of square spiral microstrip antennas for broad frequency band and multi-frequency operations by adding suitable tuning elements in a single structure. The simulation and modeling of these configurations have been done using Ansoft HFSS software. The resonant frequencies and dimensions are computed
openaire   +1 more source

High-spectral resolution solar microwave observations [PDF]

The application of high-spectral resolution microwave observations to the study of solar activity is discussed with particular emphasis on the frequency dependence of microwave emission from solar active regions.
Hurford, G. J.
core   +1 more source

The Radial Extent and Warp of the Ionized Galactic Disk. I. A VLBA Survey of Extragalactic Sources Toward the Anticenter

, 1997
We report multifrequency Very Long Baseline Array observations of twelve active galactic nuclei seen toward the Galactic anticenter. All of the sources are at |b| < 10 degrees and seven have |b| < 0.5 degrees.
Dennison B., Duffett-Smith P. J., Ghosh T., James M. Cordes, Romani R. W., T. Joseph W. Lazio, Weisberg J. M., Wouterloot J. G. A.   +7 more
core   +1 more source

A Multi-Frequency Omnidirectional Antenna Based on a Ring-Shaped Structure. [PDF]

Micromachines (Basel), 2023
Guo H, Chen Y, Wu Q, Wang J, He Y, Cao Y, Li M.   +6 more
europepmc   +1 more source

Microminiaturization of Multichannel Multifrequency Radiographs. [PDF]

Biomed Eng (NY), 2022
Gudkov AG, Vesnin SG, Leushin VY, Sidorov IA, Solov'ev YV, Tikhomirov VG, Sedankin MK, Chizhikov SV.   +7 more
europepmc   +1 more source

Medical Antennas for Microwave Radiothermometry of Biological Objects. [PDF]

Biomed Eng (NY), 2023
Sedankin MK, Leushin VY, Agasieva SV, Gudkov AG, Vesnin SG, Porokhov IO, Gudkov EA, Osipova AV, Antonenkova AY.   +8 more
europepmc   +1 more source

On extracting brightness temperature maps from scanning radiometer data [PDF]

The extraction of brightness temperature maps from scanning radiometer data is described as a typical linear inverse problem. Spatial quantization and parameter estimation is described and is suggested as an advantageous approach to a solution.
Argentiero, P., Garza-Robles, R.
core   +1 more source

Ultra-Wideband Compact Fractal Antenna for WiMAX, WLAN, C and X Band Applications. [PDF]

Sensors (Basel), 2023
Marzouk M, Rhazi Y, Nejdi IH, Zerrad FE, Saih M, Ahmad S, Ghaffar A, Hussein M.   +7 more
europepmc   +1 more source

Manipulations of multi-frequency waves and signals via multi-partition asynchronous space-time-coding digital metasurface. [PDF]

Nat Commun, 2023
Wang SR, Dai JY, Zhou QY, Ke JC, Cheng Q, Cui TJ.   +5 more
europepmc   +1 more source