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Single-layer dichroic filters for multifrequency receivers at THz Frequencies
(IEEE, 2020)
In this work, we report the design, construction, and characterization of two free-standing single-layer frequency-selective surface structures to be used as dichroic filters in the THz range. Their spectral responses are ...
Clustering and data reduction algorithm applied to spectra measured with a multi-static HF sounding system in Peru
(2023 CEDAR Workshop, 2023-06)
The HF radar is a network of HF radio beacons and receivers for ionospheric sounding, and it has been operating in Peru since 2016. The purpose of this instrument is to measure the group delay, Doppler shift, power, and ...
Quality improvements to the spectral data acquired from HF multi-static sounding system at the magnetic Equator
(2023 SWOL Workshop, 2023-10)
A network of HF radio beacons and receivers for ionospheric sounding has been operating in Peru since 2016. The purpose of this instrument is to measure the group delay, Doppler shift, power, and other parameters in order ...
A multi-GNSS, multi-frequency and near real-time ionospheric TEC monitoring system for South America
(American Geophysical Union, 2019-04)
Taking advantage of the public Global Navigational Satellite Systems (GNSS) infrastructure in South America, an operational monitoring system for the total electron content (TEC) in the ionosphere has been developed. It ...
Tackling ionospheric scintillation threat to GNSS in Latin America
(Edp Sciences S A, 2011-01-01)
Scintillations are rapid fluctuations in the phase and amplitude of transionospheric radio signals which are caused by small-scale plasma density irregularities in the ionosphere. In the case of the Global Navigation ...
Effect of ecobiometric variables in coelomic cavity organs in red-tailed boas
(2016-01-01)
B-mode ultrasound employment in snakes is a challenge because the anatomy is differentiated in relation to birds and mammals. Thus, the present study aimed to describe the topography and ultrasonographic characteristics ...
Desenvolvimento de um sistema para medição do espectro de impedância em fluidos
(Universidade Tecnológica Federal do ParanáCuritibaBrasilPrograma de Pós-Graduação em Engenharia Elétrica e Informática IndustrialUTFPR, 2017-11-23)
The need to monitor the behavior of substances is fundamental in several areas of the industry, such as the analysis of reactions in chemical reactors or the investigation of flows with multiple components, such as in the ...
Equatorial scintillation and systems support
(American Geophysical Union, 1997-09)
The need to nowcast and forecast scintillation for the support of operational systems has been recently identified by the interagency National Space Weather Program. This issue is addressed in the present paper in the ...
Tackling ionospheric scintillation threat to GNSS in Latin America
(Edp Sciences S A, 2015)