Zobrazeno 1 - 10
of 4 404
pro vyhledávání: '"vhf"'
Autor:
Brian Maximiliano Gluzman, Ramiro Avalos Ribas, Alejandro José Uriz, Juan Alberto Etcheverry, Leonardo David Vazquez, Jorge Castiñeira Moreira
Publikováno v:
Revista Elektrón, Vol 8, Iss 2, Pp 94-100 (2024)
This paper proposes the design and implementation of a vector network analyzer for frequencies up to 300 MHz. The device has the ability to measure the amplitude ratio and phase difference of the reflected and transmitted signal of a system under tes
Externí odkaz:
https://doaj.org/article/e52773893fc74bd9959e32e6b2a8ead4
Autor:
Shubham Bansal, Rajendra Singh Yadav
Publikováno v:
Journal of Engineering and Applied Science, Vol 71, Iss 1, Pp 1-18 (2024)
Abstract This article aims to examine an unsteady 2-D laminar flow of magnetohydrodynamic fluid caused by an elastic surface immersed in a permeable medium under the influence of thermal radiation and extended heat flux. Thermal conductivity and visc
Externí odkaz:
https://doaj.org/article/69370995fc8e436ba596c529823d8507
Publikováno v:
Maritime Transport Research, Vol 7, Iss , Pp 100114- (2024)
Maritime transport serves as a critical component of global trade and logistics, enabling the movement of goods and resources across oceans and waterways. Especially in busy waterways and ports, effective and accurate communication is essential, as i
Externí odkaz:
https://doaj.org/article/4e0d80e219374a7c95b520b384b15a73
Autor:
Christine Reusch, José Bernardo Vindas-Picado, Carolin Scholz, Uwe Hoffmeister, Christian C. Voigt
Publikováno v:
Global Ecology and Conservation, Vol 54, Iss , Pp e03112- (2024)
Light pollution is spreading around the world, causing a variety of problems, particularly for nocturnal animals such as bats. As urban areas expand, attic-dwelling bats face the problem of being exposed to more and more artificial light as they move
Externí odkaz:
https://doaj.org/article/0adf768c97ff446999a817eeded550ab
Autor:
Bo Chen, Yihao Xu, Chen Zhou, Yuqiang Zhang, Yi Liu, Tong Xu, Bin Xu, Jian Feng, Ting Lan, Haiyin Qing, Zhongxin Deng, Xiang Wang, Xinmiao Zhang
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 11 (2024)
There is a long history of using VHF radar systems to detect ionospheric irregularities based on the theory of coherent scattering. According to previous work, there is a high occurrence of field-aligned irregularities (FAIs) in the ionospheric E-reg
Externí odkaz:
https://doaj.org/article/f0b7bc6b14f0429aaa542d78fafbc175
Publikováno v:
Физика волновых процессов и радиотехнические системы, Vol 27, Iss 2, Pp 100-110 (2024)
Background. Currently, there is an intensive development of radar systems for remote sensing of the Earth, including those placed on unmanned aerial vehicles. Synthetic aperture radars are an effective means of round-the-clock and all-weather observa
Externí odkaz:
https://doaj.org/article/74fc1783524e43b89931cb261ce861b3
Akademický článek
Tento výsledek nelze pro nepřihlášené uživatele zobrazit.
K zobrazení výsledku je třeba se přihlásit.
K zobrazení výsledku je třeba se přihlásit.
Autor:
Dongxia Liu, Fengquan Li, Xiushu Qie, Zhuling Sun, Yu Wang, Shanfeng Yuan, Chunfa Sun, Kexin Zhu, Lei Wei, Huimin Lyu, Rubin Jiang
Publikováno v:
Geophysical Research Letters, Vol 51, Iss 16, Pp n/a-n/a (2024)
Abstract The evolution of charge structure involved in lightning discharge of a thunderstorm over the central Tibetan Plateau is investigated for the first time, based on the data from very high frequency interferometer, radar and sounding. During th
Externí odkaz:
https://doaj.org/article/648b3d8f8ceb4ac4874219347ad01932
Autor:
Aryanti Karlina Nurendyastuti, Mohammad Bagus Adityawan, Muhammad Rizki Purnama, Mohammad Sigit Arifianto, Mohammad Farid, Arno Adi Kuntoro, Widyaningtias, Mochamad Mardi Marta Dinata, Arumjeni Mitayani
Publikováno v:
Journal of Applied Science and Engineering, Vol 27, Iss 4, Pp 2285-2294 (2024)
Indonesia, located in the zone of “Ring of Fire,” has a high tsunami risk, specifically from those induced by earthquakes. The 2004 Aceh Tsunami and the 2006 Pangandaran Tsunami demonstrated that tsunamis could cause major damage to coastal areas
Externí odkaz:
https://doaj.org/article/b8bc627c5c4c4e2ab6738cda335b0374
Autor:
Berngardt, O. I.1 berng@iszf.irk.ru, Lebedev, V. P.1, Kutelev, K. A.1, Kushnarev, D. S.1, Grkovich, K. V.1
Publikováno v:
Radiophysics & Quantum Electronics. Jan2018, Vol. 60 Issue 8, p618-639. 22p.