Results 21 to 30 of about 765,097 (272)
Applied Sciences, 2016 This paper presents a novel tunable multi-frequency hybrid energy harvester (HEH). It consists of a piezoelectric energy harvester (PEH) and an electromagnetic energy harvester (EMEH), which are coupled with magnetic interaction.
Zhenlong Xu +3 more
doaj +1 more source
SAMBA: Superconducting antenna-coupled, multi-frequency, bolometric array [PDF]
, 2002 We present a design for a multipixel, multiband (100 GHz, 200 GHz and 400 GHz) submillimeter instrument: SAMBA (Superconducting Antenna-coupled, Multi-frequency, Bolometric Array). SAMBA uses slot antenna coupled bolometers and microstrip filters.
Bock, James J. +6 more
core +1 more source
Multi-frequency metasurface carpet cloaks
Optics Express, 2018 Metasurfaces provide an alternative way to design three-dimensional arbitrary-shaped carpet cloaks with ultrathin thicknesses. Nevertheless, the previous metasurface carpet cloaks work only at a single frequency. To overcome this challenge, we here propose a macroscopic metasurface carpet cloak.
Chan, Wang +7 more
openaire +2 more sources
Remote Sensing, 2023 In the framework of maritime surveillance, vessel detection techniques based on spaceborne synthetic aperture radar (SAR) images have promoted extensive applications for the effective understanding of unlawful activities at sea.
Roberto Del Prete +2 more
doaj +1 more source
Multi-Frequency VLBI observations of 3C390.3 [PDF]
Symposium - International Astronomical Union, 1996 We have mapped the broad line radio galaxy 3C390.3 at 1.3, 6, and 18 cm wavelengths with resolutions ranging from 0.2 to 2.7 mas. Our new 6 cm image is consistent with a stationary bright region located 4 to 5 mas from the core and motion of the other features with apparent velocities of 0.4 to 0.7 mas/yr.
E. Preuss, W. Alef, K. I. Kellermann
openaire +1 more source
Journal of Marine Science and Engineering, 2023 This study was conducted to investigate the acoustic characteristics of largehead hairtails (Trichiurus japonicus) in the Southern Sea of South Korea from April 2022, using 18, 38, 70, 120, and 200 kHz split-beam echosounders.
Hyungbeen Lee +3 more
doaj +1 more source
Remote Sensing, 2023 Previous studies of GNSS-IR mainly focused on the legacy L1C signal; the potential of modernized signals (L2C and L5Q) has not yet been fully exploited.
Jintao Lei, Wenhao Li, Shengkai Zhang
doaj +1 more source
Probing magnetic fields with multi-frequency polarized synchrotron emission [PDF]
, 2009 We investigate the problem of probing the local spatial structure of the magnetic field of the interstellar medium using multi-frequency polarized maps of the synchrotron emission at radio wavelengths.
Beck +28 more
core +3 more sources
Remote Sensing, 2018 To reduce the floor space of receiving antenna arrays, the Radio Ocean Remote SEnsing (RORSE) laboratory of Wuhan University developed a circular receiving array for a multi-frequency high frequency (MHF) radar system in 2014, consisting of seven ...
Chen Zhao +5 more
doaj +1 more source
A multi-frequency RF photocathode gun [PDF]
AIP Conference Proceedings, 2012 The concept of a photocathode injection gun driven by several harmonically related phase-locked RF sources is considered. This concept is aimed at providing electron bunches with parameters as follows: charge/bunch ≥1 nC, bunch energy 5-10 MeV, bunch width 20-40 ps, and fundamental frequency = 1.3 GHz.
Kuzikova, S. V. +4 more
openaire +2 more sources