This paper reviews the current technology for low frequency transducer construction and presents a non-resonant design giving an improved low frequency performance.
Some such systems are even supplied with a calibrated microphone to measure the subwoofer's in-room response, so the automatic equalizer can correct the combination of subwoofer, subwoofer location, and room response to minimize effects of room modes and improve low frequency performance.
At last, a diagnosis on the fault of inner race of rolling bearing confirms that this method removes high-frequency noise step by step, improves low-frequency signal's energy, and can effectively identify characteristic signals.
Namely under large levels of low-frequency vibration, the controller gains are increased as to improve low-frequency sensitivity.
Using a deadzone-based switching gain, large servo error signals induce extra controller gain to improve low-frequency suppression.
As a result, the sequential approach can improve low-frequency shear viscosity and extensional strain hardening characteristics while staying below the polyolefin's gel point.
The purpose of this study was to improve low-frequency (20 kHz) US methods for enhancing the transport of insulin in vitro across human skin.
The hybrid integrator is designed to obtain improved low-frequency disturbance rejection properties under double-integrator (PI2D-like) control, but without the unwanted increase of overshoot otherwise resulting from adding an extra linear integrator.
Formulae that predict the bulk acoustical properties due to these microstructures are presented and used to explore the extent to which specific microstructures could be used separately or in combination to improve low-frequency absorption.
The ERA-Interim has resolution of 0.75° × 0.75° with 37 vertical levels and has higher analysis accuracy (4D Var), improved low-frequency variability, improved hydrological cycle, and hence will be more suitable for deriving required meteorological parameters for PWV estimation.
