Results 241 to 250 of about 184,235 (277)
Some of the next articles are maybe not open access.
Science, 1984
Observations of Uranus at wavelengths of 2 and 6 centimeters with the Very Large Array were made in 1980 and 1981. The resulting maps of brightness temperature show a subsolar symmetry at 2 centimeters but a near-polar symmetry at 6 centimeters. The 6-centimeter maps show an increase in temperature from equator to pole with some evidence for a warm ...
Jaffe, Walter J. +3 more
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Observations of Uranus at wavelengths of 2 and 6 centimeters with the Very Large Array were made in 1980 and 1981. The resulting maps of brightness temperature show a subsolar symmetry at 2 centimeters but a near-polar symmetry at 6 centimeters. The 6-centimeter maps show an increase in temperature from equator to pole with some evidence for a warm ...
Jaffe, Walter J. +3 more
openaire +3 more sources
Applied Physics A, 2013
By using an on-chip microwave sensor employing spintronic and spin caloritronic principles, a spintronic technique has been developed for microwave imaging. This novel technique allows microwave fields to be directly rectified on chip into dc voltage signals. This imaging technique does not require complicated and expensive microwave systems to operate,
Z. X. Cao +4 more
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By using an on-chip microwave sensor employing spintronic and spin caloritronic principles, a spintronic technique has been developed for microwave imaging. This novel technique allows microwave fields to be directly rectified on chip into dc voltage signals. This imaging technique does not require complicated and expensive microwave systems to operate,
Z. X. Cao +4 more
openaire +1 more source
Measurement Techniques, 2000
Designs and basic characteristics are considered for imagers having ellipsoidal-mirror and lens antennas. These operate in the 8 mm range and are intended for ultrasensitive measurement of millimeter-range field patterns and for the construction of images by computer processing.
V. I. Gvozdev +3 more
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Designs and basic characteristics are considered for imagers having ellipsoidal-mirror and lens antennas. These operate in the 8 mm range and are intended for ultrasensitive measurement of millimeter-range field patterns and for the construction of images by computer processing.
V. I. Gvozdev +3 more
openaire +1 more source
Multifrequency microwave imaging
The Fifth International Kharkov Symposium on Physics and Engineering of Microwaves, Millimeter, and Submillimeter Waves (IEEE Cat. No.04EX828), 2004Microwave imaging techniques are considered to be of great importance for different applications, and are extensively studied. One of the biggest problems of microwave imaging investigation is lack of experimental investigations what holds off practical implementation of these techniques.
V. Semenchik, V. Pahomov, S. Kurilo
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2020
Microwave imaging (MWI) systems are nowadays acquiring an ever-growing importance in numerous application fields, such as non-destructive testing (NDT) in civil and industrial applications, subsurface sensing and ground penetrating radar (GPR) prospection, through-wall imaging (TWI) for security and biomedical imaging.
Fedeli, Alessandro +2 more
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Microwave imaging (MWI) systems are nowadays acquiring an ever-growing importance in numerous application fields, such as non-destructive testing (NDT) in civil and industrial applications, subsurface sensing and ground penetrating radar (GPR) prospection, through-wall imaging (TWI) for security and biomedical imaging.
Fedeli, Alessandro +2 more
openaire +1 more source
IEEE Microwave Magazine, 2012
Due to the enormous advances made in semiconductor technology over the last few years, high integration densities with moderate costs are achievable even in the millimeter-wave (mm-wave) range and beyond, which encourage the development of imaging systems with a high number of channels.
Sherif Sayed Ahmed +5 more
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Due to the enormous advances made in semiconductor technology over the last few years, high integration densities with moderate costs are achievable even in the millimeter-wave (mm-wave) range and beyond, which encourage the development of imaging systems with a high number of channels.
Sherif Sayed Ahmed +5 more
openaire +1 more source
Metamaterial microwave holographic imaging system
Journal of the Optical Society of America A, 2014We demonstrate a microwave imaging system that combines advances in metamaterial aperture design with emerging computational imaging techniques. The flexibility inherent to guided-wave, complementary metamaterials enables the design of a planar antenna that illuminates a scene with dramatically varying radiation patterns as a function of frequency.
John, Hunt +7 more
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Multidimensional microwave imaging
Microwave and Optical Technology Letters, 1995AbstractThe high computational load associated with multidimensional high‐resolution algorithms is overcome by using only 1D LP techniques. The 3D backscattered field is approximated by three 1D AR models that are solved in succession for the down‐range, horizontal cross‐range, and vertical cross‐range positions of the scattering centers of a target.
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2016
Radar breast imaging (RBI) involves the illumination of the breast with a microwave pulse. If a tumour is present, backscattered radar signals are generated due to the dielectric contrast between normal and tumour tissue at microwave frequencies. These backscattered signals are processed by an RBI beamformer to identify the presence and location of any
Martin O’Halloran +5 more
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Radar breast imaging (RBI) involves the illumination of the breast with a microwave pulse. If a tumour is present, backscattered radar signals are generated due to the dielectric contrast between normal and tumour tissue at microwave frequencies. These backscattered signals are processed by an RBI beamformer to identify the presence and location of any
Martin O’Halloran +5 more
openaire +1 more source