نتایج جستجو برای: stable operation
تعداد نتایج: 464197 فیلتر نتایج به سال:
In this work, quantum cascade lasers (QCLs) based on strain compensation combined with two-phonon resonance design are presented. Distributed feedback (DFB) laser emitting at ~ 4.76 μm was fabricated through a standard buried first-order grating and buried heterostructure (BH) processing. Stable single-mode emission is achieved under all injection currents and temperature conditions without any...
This paper introduces a control strategy for the assessment of SAPF (shunt active power filters) role in the electrical power networks. The proposed control scheme is based on the Lyapunov control theory and defines a stable operating region for the interfaced converter during the integration time with the utility grid. The compensation of instantaneous variations of reference current component...
Device-layer Ovenization of Fused Silica Micromechanical Resonators for Temperature-stable Operation
In this paper, we report on temperature-stable operation of multiple MEMS silica resonators on an ovenized fused silica device-layer. Temperature servo-control circuits are implemented for compensating the resonator frequency drift using an on-chip RTD-based temperature sensor. A wide linear range analog controller has been implemented to reduce the effective TCF of fused silica resonator by an...
Currently there are a few fields of application using quartz crystal microbalances (QCM). Because of environmental conditions and insufficient resolution of the microbalance, chemical sensing of volatile organic compounds in an open system was as yet not possible. In this study we present strategies on how to use 195 MHz fundamental quartz resonators for a mobile sensor platform to detect airbo...
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