Broadband noise with profound low-frequency profile is prevalent and difficult to be controlled mechanically. This study demonstrates effective broadband sound absorption by reducing the mechanical reactance of a loudspeaker using a shunt circuit through electro-mechanical coupling, which induces reactance with different signs from that of loudspeaker. An RLC shunt circuit is connected to the m...

3 I CONTROL OF THE DC-AC MMC FOR VARIABLE-SPEED DRIVE SYSTEMS 5 1.1 Glossary of terms 5 1.2 Introduction 6 1.3 The MMC 8 1.3.1 Dynamic Model 8 1.4 Low-Frequency Operation 9 1.4.1 The Existing Sine-wave Strategy 9 1.4.2 The Proposed Strategies 11 1.4.3 Comparison of the Proposed Strategies with the Sine-Wave Strategy 12 1.5 Controller Design Methodology 13 1.6 Closed-loop System 15 1.6.1 Closed-...

The positioning of electrodes in electrical impedance myography (EIM) is critical for accurately assessing disease progression and effectiveness of treatment. In human and animal trials for neuromuscular disorders, inconsistent electrode positioning adds errors to the muscle impedance. Despite its importance, how the reproducibility of resistance and reactance, the two parameters that define EI...

BACKGROUND Monitoring of respiratory function is important in the diagnosis and management of respiratory disease. The forced oscillation technique requires minimal patient cooperation and is ideal for the determination of respiratory function in young children. This study aimed to develop reference ranges and to document the repeatability in healthy young children using commercially available ...

The forced oscillation technique provides information concerning respiratory impedance, which comprises resistance and reactance of the respiratory system. However, its relationship with morphological changes of the lungs in chronic obstructive pulmonary disease (COPD) remains unclear. Respiratory impedance and spirometric data were evaluated in 98 patients with COPD and 49 reference subjects. ...

This paper considers the problem of rnultiport passive rietwark synthesis for a rational hounded real scatter in^ matrix S ( p ) using state-space ideas. The technique is to extract reactances from a network synthesizing the prescribed S ( p ) to yield a resistive coupling network that may contain transformers, resistors, and if there is no reciprocity constraint, gyrators. Here a minimum numbe...

Measurements of middle ear (ME) acoustic power flow (power reflectance, power absorption, and transmittance) and normalized impedance (acoustic resistance, acoustic reactance, and impedance magnitude) were compared for their utility in clinical applications. Transmittance, a measure of the acoustic power absorbed by the ME, was found to have several important advantages over other measures of a...

Despite persistent government and industry efforts to stop the sharing and downloading of media such as files over peer-to-peer (P2P) networks, this activity shows no sign of abating. This research investigated whether psychological reactance could account for variance in the intent to engage in, and the extent of such behaviour beyond that accounted for by the standard Theory of Planned Behavi...