Results 11 to 20 of about 11,299,846 (307)
Brazilian Journal of Physics, 2006 High-spin states in the neutron-deficient140Gd nucleus have been studied with the 92Mo(54Fe,a2p) reaction at a beam energy of 240 MeV. The level scheme of 140Gd was considerably extended from what was previously known. In this work we concentrate on one of the 9 bands observed, which presents relatively strong M1 transitions and negligible signature ...
Oliveira, J.R.B. +25 more
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IEEE Antennas and Wireless Propagation Letters, 2022 This letter presents a concept for a surface exhibiting tunable reflectivity that operates within the K-band using varactor diodes. Thereby, the impedance of a two-layer metasurface is controlled through lumped components at its back side and not from the front, where discrete elements would scatter the incident wave. A reflector's design, verification,
Christoph Kohlberger +2 more
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Combined Single-Layer K-Band Transmitarray and Beamforming S-Band Antenna Array for Satcom
IEEE Open Journal of Antennas and Propagation, 2022 In this paper, a dual-band antenna at 4.5 GHz and 25 GHz is presented. The antenna is a low-frequency phased patch antenna array combined with a high-frequency transmitarray with a fixed beam.
Daniel Edelgaard Serup +2 more
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K-Band Microlensing of the Inner Galaxy [PDF]
The Astrophysical Journal, 1995 10 pages, texfile requires phyzzx, no figures, send to gould@payne.mps.ohio-state.edu for postscript ...
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The Hawaii K-band galaxy survey. 1: Deep K-band imaging
The Astrophysical Journal, 1994 We present the results of a very deep K-band survey with a 5 sigma total galaxy magnitude limit of K = 21.9 in the deepest field. A 5 sigma K-band-selected sample of 123 galaxies is presented, together with their optical colors. Only three galaxies in this sample are not detected at the 1 sigma level in Kron-Cousins I band.
L. L. Cowie +5 more
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Hybrid‐fed shared aperture antenna array for X/K‐band airborne synthetic aperture radar applications
IET Microwaves, Antennas & Propagation, 2021 The design of X/K‐band shared aperture antenna (SAA) single‐linear polarized K‐band, dual‐polarized (linear/circular) X‐band 36‐elements (6×6) planar array antenna with high gain, and low cost for airborne synthetic aperture radar systems is presented ...
Venkata Kishore Kothapudi, Vijay Kumar
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Wideband compact antennafor K-band applications [PDF]
Electronics Letters, 2000 A compact coupled microwave active antenna is presented. This antenna is proximity fed, and consists of a square radiating element array on a polymer dielectric layer. The compactness of the antenna is obtained through technological optical processes and the parasitic patch phenomenon which increases the bandwidth.
Grzeskowiak, Marjorie +2 more
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Photochemical activity in Dalbergia nigra (Vell.) Fr. Allem. seedlings submitted to water deficit
Journal of Forest Science, 2018 In this study, we evaluated the influence of the daily variation of both intensity of photosynthetically active radiation (PAR) and temperature on chlorophyll a fluorescence parameters in Jacarandá-da-Bahia seedlings submitted to two treatments: T1 ...
Natiele SANDRINI CELOVANE +6 more
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High-efficiency lithium niobate modulator for K band operation
APL Photonics, 2020 This paper reports a hybrid silicon nitride–lithium niobate electro-optic Mach–Zehnder-interferometer modulator that demonstrates overall improvements in terms of half-wave voltage, optical insertion loss, extinction ratio, and operational bandwidth. The
Abu Naim R. Ahmed +5 more
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Derivation of myoepithelial progenitor cells from bipotent mammary stem/progenitor cells.
PLoS ONE, 2012 There is increasing evidence that breast and other cancers originate from and are maintained by a small fraction of stem/progenitor cells with self-renewal properties.
Xiangshan Zhao +3 more
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