Results 41 to 50 of about 260 (157)

A Ku-Band Compact Disk-Beam Relativistic Klystron Oscillator Operating at Low Guiding Magnetic Field

IEEE Access, 2021
The disk-beam relativistic klystron oscillator (DB-RKO) with the radial-line high frequency structure is one of the attractive high power microwave (HPM) sources due to its specific virtues of weak space-charge effect, high power handling capacity and ...
Fangchao Dang, Fuxiang Yang, Xingjun Ge, Xinhe Wu, Xiaoping Zhang   +4 more
doaj   +1 more source

Evaluation of Mechanical Properties and HPM Pulse Shielding Effectiveness of Cement-Based Composites

Energies, 2023
In today’s world, protection against electromagnetic waves, including high-power microwave (HPM) pulses, is becoming increasingly important. Hence, the aim of this research was to select an absorbing admixture, which, when used in an appropriate quantity,
Michał Musiał, Dominik Logoń, Krzysztof Majcher, Paweł Niewiadomski, Tomasz Trapko, Kamila Jarczewska, Wojciech Pakos, Adrian Różański, Maciej Sobótka, Damian Stefaniuk   +9 more
doaj   +1 more source

Effect of high power microwave injection on ozone balance

AIP Advances, 2019
High power microwave (HPM) injection into the troposphere to block the chain of chlorofluorocarbons (CFCs) or injection into the stratosphere to promote ozone generation are two feasible methods to artificially affect the ozone number concentration ...
Yaogai Hu, Xiaoli Zhu, Lina Chen, Zhengyu Zhao   +3 more
doaj   +1 more source

Analysis of Low-Frequency Communication of Hypersonic Vehicles in Thermodynamic and Chemical Non-Equilibrium State

Applied Sciences, 2023
A plasma sheath will be developed surrounding a hypersonic vehicle in flight, which can reflect, absorb, and scatter electromagnetic (EM) waves of lower frequencies than its own, resulting in a communication blackout. This paper focuses on knowing how to
Kaijie Wang, Xuequan Chen, Zhongkai Wen
doaj   +1 more source

Nocturnal sucrose does not reflect the hydrogen isotope composition of transitory starch in leaves as expected

Plant Biology, Volume 27, Issue 4, Page 461-475, June 2025.
The hydrogen isotope composition of leaf sucrose is independent of whether sucrose is synthesized from current assimilate or remobilized transitory starch. Abstract The hydrogen isotope composition (δ2H) of cellulose is inherently linked to that of sucrose synthesized in leaves.
A. Wacker, D. B. Nelson, G. Tcherkez, M. M. Lehmann, A. Kahmen, M. Holloway‐Phillips   +5 more
wiley   +1 more source

Reliability Evaluation and Failure Simulation Research of the PIN Limiter in Complex Electromagnetic Environments

IEEE Access
As the electromagnetic environment becomes increasingly complex, high-power microwave (HPM) pulses with different parameters are superimposed and coupled into RF receivers. Consequently, the PIN limiter at the front end often fails due to excessive input
Lan Li, Yang Zhang, Lishan Zhao, Xingjun Ge, Yuwei Fan   +4 more
doaj   +1 more source

Modelling of a High Power Microwave (HPM) Source using 300 KV Marx Generator and Horn Type Antenna

Indian Journal of Science and Technology, 2017
Objectives: To analyse a High Power Microwave (HPM) source connected to a horn antenna by a mathematical model and feeding it with various pulse shapes to find its response. To estimate the E far-field produced and compare it with experimental measurements.
Navdeep M. Singh, Faruk Kazi, Sachin B. Umbarkar, Sharmila Petkar   +3 more
openaire   +1 more source

Recovery of Rare Earths from End‐of‐Life NdFeB Permanent Magnets from Wind Turbines

ChemSusChem, Volume 18, Issue 10, May 19, 2025.
This work outlines a process for the recovery of rare earth elements from permanent magnets from wind turbines. Pyrometallurgical and hydrometallurgical methods are employed to produce a concentrated rare earth solution. Finally, these elements are selectively precipitated yielding a mixed rare earth oxalate. This process demonstrates the efficient and
Lorena Alcaraz, Olga Rodríguez‐Largo, Gorka Barquero‐Carmona, Alba Berja, Adrián Quesada, Félix A. López   +5 more
wiley   +1 more source

Design of an Energy Selective Reflectarray Antenna for Adaptive Prevention of High‐Intensity Radiation Fields

IET Microwaves, Antennas &Propagation, Volume 19, Issue 1, January/December 2025.
This work presents an adaptive reflectarray for the high‐intensity radiation fields (HIRF) prevention in X‐band, thereby reducing the risk of interference or damage to front‐ends, receiving links, and other electronic components. ABSTRACT This paper presents an energy selective reflectarray antenna with field‐induced gain to prevent the high‐intensity ...
Jihong Zhang, Zhuang Qu, Ming Xu, Duocai Zhai, Song Zha, Peiguo Liu   +5 more
wiley   +1 more source

A Wideband Vivaldi Array With Enhanced Power Handling Capacity

International Journal of Antennas and Propagation, Volume 2025, Issue 1, 2025.
This paper proposes an all‐metal Vivaldi array based on the tight coupling effect with enhanced power handling capacity (PHC). To achieve this, L29 connectors and enlarged parallel‐plate waveguides are strategically implemented to reduce localized electric field intensity. By optimizing the reflective cavity dimensions, half‐wavelength resonance within
Hongzhou Gong, Jiande Zhang, Chengwei Yuan, Qiang Zhang, Yanhong Yu, Trushit Upadhyaya   +5 more
wiley   +1 more source