Results 21 to 30 of about 14,126,310 (342)

Band K Satellite Receiver Signal and Radio Locator

Scientific Journal of Gdynia Maritime University, 2022
The last dozen or so years has seen significant and dynamic development in satellite technologies. Devices using satellites circulating in space for the purposes of general communication have ceased to be the domain of a narrow group of recipients ...
Marian Wnuk
doaj   +1 more source

A Tunable K-Band Reflector

IEEE Antennas and Wireless Propagation Letters, 2022
<p>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.
Christoph Kohlberger, Andrew Kearns, Andreas Stelzer   +2 more
openaire   +1 more source

A Multifunctional Polarization Transforming Metasurface for C-, X-, and K-Band Applications

IEEE Antennas and Wireless Propagation Letters, 2021
An efficient multifunctional metasurface for cross and circular polarization conversion is presented in this letter. The metasurface acts not only as an efficient polarization converter for linearly polarized wave over frequency bands of 5.3–5.4, 7.2–8 ...
Fahad Ahmed, Muhammad Ismail Khan, F. A. Tahir   +2 more
semanticscholar   +1 more source

Differential response of photosystem II and I photochemistry in leaves of two Crambe abyssinica Hochst lineages submitted to water deficit

Photosynthetica, 2020
Water stress is one of the most important abiotic factors affecting plants worldwide. This study compared the photochemical responses of two lineages of Crambe abyssinica (FMS CR 1307 and 1326) under water deficit (WD) conditions.
P.C.S. BRAGA, J.P.R. MARTINS, R. BONOMO, R.M. BORGES, J.V.G. SILVA, A.R. FALQUETO   +5 more
doaj   +1 more source

Special issue in honour of Prof. Reto J. Strasser - Revisiting JIP-test: An educative review on concepts, assumptions, approximations, definitions and terminology

Photosynthetica, 2020
The aim of this educative review is, by revisiting the JIP-test as introduced and further elaborated and extended by Professor Reto J. Strasser and his research group, to clarify concepts, assumptions, and approximations on which it is based, as well as ...
M. TSIMILLI-MICHAEL
doaj   +1 more source

The Calar Alto Deep Imaging Survey: K-band Galaxy Number Counts [PDF]

, 2001
We present K-band number counts for the faint galaxies in the Calar Alto Deep Imaging Survey (CADIS). We covered 4 CADIS fields, a total area of 0.2deg^2, in the broad band filters B, R and K.
Abraham, Arnouts, Arnouts, B. von Kuhlmann, Bershady, Bertelli, Bertin, Bruzual, C. Wolf, Casali, Cowie, Cowie, Cowie, D. Thompson, Djorgovski, E. Thommes, Ellis, Ellis, Fioc, Gardner, Gardner, Glazebrook, H. Hippelein, H.-J. Röser, Hogg, Huang, Huang, J. W. Fried, J.-S. Huang, K. Meisenheimer, Kinney, Kümmel, Lilly, M. W. Kümmel, McCracken, Metcalfe, Metcalfe, Minezaki, Moustakas, Prandoni, R. Fockenbrock, S. Phleps, S. V. W. Beckwith, Saracco, Saracco, Smail, Songaila, Steidel, Steidel, Szokoly, Thommes, Thompson, van den Bergh, Wainscoat, Williams, Wolf, Wolf, Worthy   +57 more
core   +2 more sources

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, Gert Frolund Pedersen, Shuai Zhang   +2 more
doaj   +1 more source

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, J. P. Gardner, E. M. Hu, A. Songaila, K.-W. Hodapp, R. J. Wainscoat   +5 more
openaire   +1 more source

The K-Band Galaxy Luminosity Function [PDF]

, 2000
We measured the K-band luminosity function using a complete sample of 4192 morphologically-typed 2MASS galaxies with 7 < K < 11.25 mag spread over 2.12 str.
Andreon S., C. S. Kochanek, E. E. Falco, Efstathiou G., Gardner J. P., Gavazzi G., Gavazzi G., Glazebrook K., Glazebrook K., Guiderdoni B., Huchra J. P., J. Mader, J. P. Huchra, M. A. Pahre, Maihara T., Mobasher B., Mobasher B., Naim A., Naim A., R. Cutri, S. E. Schneider, T. Chester, T. H. Jarrett, Vettolani G., Zucca E.   +24 more
core   +4 more sources

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, Jadson BONINI ZAMPIROLLO, Thais SILVA COSTA, Clodoaldo LEITES PINHEIRO, Diolina MOURA SILVA, Elisa MITSUKO AOYAMA, Antelmo RALPH FALQUETO   +6 more
doaj   +1 more source