scholarly journals Street‐scale mapping of urban radio frequency noise at very high frequency and ultra high frequency

2020 ◽  
Author(s):  
Daniel Breton ◽  
Caitlin Haedrich ◽  
Matthew Kamrath ◽  
D. Wilson
Radio Science ◽  
2019 ◽  
Vol 54 (11) ◽  
pp. 934-948
Author(s):  
Daniel J. Breton ◽  
Caitlin E. Haedrich ◽  
Matthew J. Kamrath ◽  
D. Keith Wilson

Nature ◽  
1955 ◽  
Vol 175 (4465) ◽  
pp. 949-950 ◽  
Author(s):  
D. R. HAY ◽  
T. R. HARTZ

2011 ◽  
Vol 21 (02) ◽  
pp. 163-173 ◽  
Author(s):  
TIMOTHY S. NELSON ◽  
COURTNEY L. SUHR ◽  
DEAN R. FREESTONE ◽  
ALAN LAI ◽  
AMY J. HALLIDAY ◽  
...  

A closed-loop system for the automated detection and control of epileptic seizures was created and tested in three Genetic Absence Epilepsy Rats from Strasbourg (GAERS) rats. In this preliminary study, a set of four EEG features were used to detect seizures and three different electrical stimulation strategies (standard (130 Hz), very high (500 Hz) and ultra high (1000 Hz)) were delivered to terminate seizures. Seizure durations were significantly shorter with all three stimulation strategies when compared to non-stimulated (control) seizures. We used mean seizure duration of epileptiform discharges persisting beyond the end of electrical stimulation as a measure of stimulus efficacy. When compared to the duration of seizures stimulated in the standard approach (7.0 s ± 10.1), both very high and ultra high frequency stimulation strategies were more effective at shortening seizure durations (1.3 ± 2.2 s and 3.5 ± 6.4 s respectively). Further studies are warranted to further understand the mechanisms by which this therapeutic effect may be conveyed, and which of the novel aspects of the very high and ultra high frequency stimulation strategies may have contributed to the improvement in seizure abatement performance when compared to standard electrical stimulation approaches.


2020 ◽  
Vol 48 (1) ◽  
pp. 99-103
Author(s):  
Xiyue Liu ◽  
Chao Ye ◽  
Xiangying Wang ◽  
Su Zhang ◽  
Min Zhu ◽  
...  

Author(s):  
Е.В. Востриков ◽  
Д.А. Погорелая ◽  
А.Н. Никитенко ◽  
А.С. Алейник

In this paper, the phase modulator optical phase drift reduction method is proposed and researched for LiNbO3 multi-functional integrated optical chip as a part of a fiber-optic gyroscope. This approach consists of applying a very high-frequency noise signal to a phase modulator in the range from 20 MHz to 100 MHz, which is outside of a fiber-optic gyroscope operating frequency range. The presented method showed that the increase in very high-frequency noise signal voltage up to around 1.7 half-wave voltages of the phase modulator allows decreasing optical phase drift by more than 4 times in the frequency range below 64.5 kHz.


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