Results 21 to 30 of about 19,811 (315)

Radio Direction Finding in Air Traffic Services

Promet (Zagreb), 2005
The paper analyses the Radio Direction Finding principlefor navigation and swveillance system. Radio Direction Findinginvolves locating the bearing of a transmitter called a radiobeacon.
Andrej Novak
doaj   +1 more source

Flickering of a radio-signal due to an atmospheric turbulence

Физика волновых процессов и радиотехнические системы, 2023
Background. Turbulent fluctuations of the refractive index in the atmosphere lead to distortions during the passage of the radio signal. This can lead to distortion of the transmitted information due to the resulting fluctuations of the amplitude, phase ...
Dmitriy S. Klyuev, Andrey N. Volobuev, Sergei V. Krasnov, Kaira A. Adyshirin-Zade, Tatyana A. Antipova, Natalia N. Aleksandrova   +5 more
doaj   +1 more source

Effect of Parasitic Element on 408 MHz Antenna for Radio Astronomy Application

International Journal of Antennas and Propagation, 2014
Antenna is one of the important subsystem components in a radio telescope system. In this paper, analysis on the effect of parasitic element on 408 MHz antenna in a radio telescope system is presented.
Radial Anwar, Mohammad Tariqul Islam, Norbahiah Misran, Geri Gopir, Baharudin Yatim, Mhd Fairos Asillam   +5 more
doaj   +1 more source

A Broadband Planar Spiral Antenna Design for Electromagnetic Signal Monitoring

IEEE Access, 2020
In order to meet the wide-band full-space radio monitoring task, the design of a circular-polarized planar dual-arm composite spiral antenna is presented in this paper.
Daifu Chen, Hongxin Zhang, Jun Xu
doaj   +1 more source

Analysis of integrated UWB MIMO and CR antenna system using transmission line model with functional verification

Scientific Reports, 2022
This paper discusses the equivalent circuit model and functional verification of an integrated antenna system as its main focus. The integrated antenna system consists of two independent antenna systems, namely the Cognitive Radio antenna and the Ultra ...
P. Prabhu, Malarvizhi Subramani, Kyung-sup Kwak   +2 more
doaj   +1 more source

Revealing the structure of land plant photosystem II: the journey from negative‐stain EM to cryo‐EM

FEBS Letters, EarlyView.
Advances in cryo‐EM have revealed the detailed structure of Photosystem II, a key protein complex driving photosynthesis. This review traces the journey from early low‐resolution images to high‐resolution models, highlighting how these discoveries deepen our understanding of light harvesting and energy conversion in plants.
Roman Kouřil
wiley   +1 more source

Dual-Fed DRA Subarrays Featuring Versatile Polarization Reconfigurability With High Port Isolation and Suppressed Cross-Polar Radiations

IEEE Open Journal of Antennas and Propagation
near square Dielectric Resonator Antenna (DRA) geometry with dual-aperture feeding has been explored. This aims in achieving a number of attractive features from a standalone unit as well as a 4-element subarray.
Satyajit Chakrabarti, Debatosh Guha
doaj   +1 more source

CREATING THE RT-32 RADIO TELESCOPE ON THE BASIC OF MARK-4B ANTENNA SYSTEM. 2. ESTIMATION OF THE POSSIBILITY FOR MAKING SPECTRAL OBSERVATIONS OF RADIO ASTRONOMICAL OBJECTS

Radio Physics and Radio Astronomy, 2019
Purpose: Technical capabilities of the MARK-4B antenna system necessary for its further using as a 32-meter radiotelescope (RT-32) and making simultaneous spectral radioastronomical observations in the C and K frequency ranges, are investigated ...
A. V. Antyufeyev, A. M. Korolev, O. M. Patoka, V. M. Shulga, O. M. Ulyanov, O. M. Reznichenko, V. V. Zakharenko, V. I. Prisiazhnii, A. V. Poichalo, V. V. Voityuk, V. N. Mamarev, V. V. Ozhinskii, V. P. Vlasenko, V. M. Chmil, V. I. Lebed, M. I. Palamar, A. V. Chaikovskii, Yu. V. Pasternak, M. A. Strembitskii, M. P. Natarov, S. O. Steshenko, V. V. Glamazdyn, A. S. Shubny, A. A. Kirilenko, D. Y. Kulik, A. M. Pylypenko   +25 more
doaj   +1 more source

Structural instability impairs function of the UDP‐xylose synthase 1 Ile181Asn variant associated with short‐stature genetic syndrome in humans

FEBS Letters, EarlyView.
The Ile181Asn variant of human UDP‐xylose synthase (hUXS1), associated with a short‐stature genetic syndrome, has previously been reported as inactive. Our findings demonstrate that Ile181Asn‐hUXS1 retains catalytic activity similar to the wild‐type but exhibits reduced stability, a looser oligomeric state, and an increased tendency to precipitate ...
Tuo Li, Pedro A. Sánchez‐Murcia, Bernd Nidetzky   +2 more
wiley   +1 more source

CREATING THE RT-32 RADIO TELESCOPE ON THE BASIC OF MARK-4B ANTENNA SYSTEM. 1. MODERNIZATION PROJECT AND FIRST RESULTS

Radio Physics and Radio Astronomy, 2019
Purpose: Creating a radio telescope based on the MARK-4B antenna system being developed for telecommunication applications, determining the possibilities of using the broadband multirange operation of a beam wave-guided antenna system and to evaluate ...
O. M. Ulyanov, O. M. Reznichenko, V. V. Zakharenko, A. V. Antyufeyev, A. M. Korolev, O. M. Patoka, V. I. Prisiazhnii, A. V. Poichalo, V. V. Voityuk, V. N. Mamarev, V. V. Ozhinskii, V. P. Vlasenko, V. M. Chmil, V. I. Lebed, M. I. Palamar, A. V. Chaikovskii, Yu. V. Pasternak, M. A. Strembitskii, M. P. Natarov, S. O. Steshenko, V. V. Glamazdyn, A. S. Shubny, A. A. Kirilenko, D. Y. Kulik, A. A. Konovalenko, L. M. Lytvynenko, Ya. S. Yatskiv   +26 more
doaj   +1 more source