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At the high voltage laboratory at ETH Zurich switching arcs are investigated in order to understand the physical processes that determine the relationship between current and arc voltage in gas blast circuit breakers. Experiments are performed using a breaker prototype with many independently controllable parameters, and very versatile pulsed DC current source. Previous work showed that the gas pressure...
Recent studies have focused on modeling the response of the early auditory processing stages to sound stimuli. However, the influence of sound on the higher stages like the auditory thalamus are not well identified. To understand how different sound stimuli affect the response of neurons in these higher stages, it is necessary to model the auditory pathway from the auditory nerve (AN) through the...
Synthetic genetic circuits sometimes exhibit unexpected functionality or even fail entirely when implemented in vivo, due to the effects of interactions with the host cell that were not accounted for in the circuit's design. In this paper, we consider the effects that limitations in cellular resources have on the dynamics of a synthetic cellular oscillator. We show that incorporating these effects...
This paper deals with the high-level simulation of a frequency-shift-keying (FSK) modulator based on charge-controlled memconductor. The behavioral model of the memconductor is built on SIMULINK under MATLAB environment. It is demonstrated that the incremental memconductance increases and decreases according the width and amplitude of a positive and negative pulse signal, respectively; whereas the...
Searching for better results, the classic mathematical tools and theorems of dynamic control theory are applied to the analyses of the numeric routine for electrical transients' digital simulations. This numeric routine solves the linear system that represents the π circuits' cascade. So, the differential equations of this system are analyzed using Laplace's transform and, based on these analyses,...
Considering simulations of electromagnetic transients and searching for better results, it is investigated the limits of the change of the representation of the longitudinal parameters in the model of infinitesimal unit of transmission lines' model. It is introduced a damping resistance in parallel to the impedance that represents the longitudinal parameters of transmission lines. Several simulations...
A simple oscillator with perfect output power using a series feedback and circuit matching is proposed. The oscillator is implemented by tuning the positive feedback of the source and gate of the transistor and provides a free-running oscillating signal of 12 GHz. The output power of the oscillator is 10.16 dBm. This result is in good agreement with simulation.
This paper presents a condition for global asymptotic synchronization of Liénard-type nonlinear oscillators in uniform LTI electrical networks with series R-L circuits modeling interconnections. By uniform electrical networks, we mean that the per-unit-length impedances are identical for the interconnecting lines. We derive conditions for global asymptotic synchronization for a particular feedback...
MEMS resonators integrated with CMOS feedback networks have a potentially wide field of applications as oscillator circuits in communications and sensor systems. However, considerable advancements to this nascent technology are required to realize such a vision. We present a configurable CMOS chip which facilitates the development of MEMS-referenced oscillators, especially for timing and sensing applications...
Different from the former stable low-frequency oscillation cases, the one of Xuzhou North Railway Hub which occurred in January 2014 is particularly extraordinary because it caused abnormal voltage fluctuations. By testing the locomotive and traction power supply system, we obtained the voltage and current data which were in low-frequency oscillation. Then, to further analyze the mechanism of this...
It is shown experimentally that active resistance of frequence dependent device keep his high value till the currents of several kiloampere at the frequencies from 60 kHz up to 200 kHz. It points out on the working capacity of device not only at operating current but at lightning strokes.
The XXI century companies are increasingly interested on in the development of complex processes on bioengineering and health sciences. In this context, it is essential for undergraduate and graduate students to understand the behavior of complex phenomena. However, nowadays, academic programs are limited to the study of linear systems and first-order approximations; while companies use sophisticated...
Processes in the power scheme double-bridge series resonant converter are considered. The equivalent circuit of the converter based on the imposition of linear active resonant contours with sources of rectangular form voltage is applied to the analysis of processes. The expressions for the discrete the control-to-output-envelope transfer functions of the active resonant contour and of the resonant...
We numerically demonstrate a possibility on-off keying (OOK) type of modulation over tens gigabits per second for sub-terahertz radiation by using our proposed wireless transmitter device structure towards radio over fiber (RoF) technology. The integrated device consists of an InP-based compound semiconductor resonant tunneling diode (RTD) adjacent to an InP-based photo diode (PD), a broadband type...
In this paper, a new model based on piecewise linear (PWL) functions is proposed and analyzed by considering the well known Pernarowski's mathematical model for an isolated beta cell. Contrary to Pernarowski's model, we replace the original cubic functions with PWL functions with multi-segments in order to obtain bursting electrical activity (BEA) of beta cell. The number of segments depends on the...
Self-injection locked oscillators have been recently proposed for motion sensing applications demonstrating a good experimental performance. Here a detailed investigation of the system dynamics is presented using a realistic model of the oscillator circuit under the injection of the reflected signal, which is phase modulated due to the target motion. The instability effects observed for some distance...
The Introduction of the 48V power network in passenger cars will lead to lower CO2 emission mainly due to improved power recuperation. However, as a result of the higher DC system voltage the risk of electric arcs is increasing in consequence of broken wires or damaged isolation. Beside the risk of fire the dynamic arc is able to interact with the rest of the power network to produce high frequency...
Using the Briggs-Bers criterion, we find that the lower band edge of linear beam TWTs is not subjected to absolute instability. At the upper band edge, we find a threshold beam current beyond which absolute instability is excited. In general, an absolute instability would occur in a linear beam tube if the cold-tube circuit dispersion curve in the frequency-wavenumber (ω-k) plane is locally convex...
Recently, Wireless Sensor Networks (WSNs) have been widespread utilized in automation. The power supply of WSNs has significant influences on their performance. This paper presents a novel power management circuit for WSNs. The proposed circuit provides an interminable energy source for wireless sensor nodes through environmental energy harvesting. The energy harvester is comprised of a thermoelectric...
An Ultra Stable Oscillator is being developed by AccuBeat (named USO) for the Gravity and Geophysics of Jupiter and the Galilean Moons (3GM) radio occultation experiment of the ESA JUICE mission. This paper reviews the oscillator design and the critical issues to be tackled. The USO is a compact 15×13×10cm3 oscillator, based on a quartz crystal resonator and highly stable double oven. A Partial Engineering...
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