PURPOSE Voice therapy with a semi-occluded vocal tract has a long history. The use of lip trills, tongue trills, bilabial fricatives, humming, and phonation into tubes or straws has been hailed by clinicians, singing teachers, and voice coaches as efficacious for training and rehabilitation. Little has been done, however, to provide the scientific underpinnings. The purpose of the study was to ...

Purpose—In a coupled parallel transmit (pTx) array, the power delivered to a channel is partially distributed to other channels because of coupling. This power is dissipated in circulators resulting in a significant reduction in power efficiency. In this paper, a technique for designing robust decoupling matrices interfaced between the RF amplifiers and the coils is proposed. The decoupling mat...

in this study, a novel variable impedance control for a lower-limb rehabilitation robotic system using voltage control strategy is presented. the majority of existing control approaches are based on control torque strategy, which require the knowledge of robot dynamics as well as dynamic of patients. this requires the controller to overcome complex problems such as uncertainties and nonlinearit...

Induced polarization (IP) method has been successfully implemented in investigation of groundwater, geothermal and metallic ores. From published (Nordsiek and Weller, 2008) spectral induced polarization (SIP) data, the amplitude and phase spectra have been derived. Frequencydependent impedance data sets have been calculated from these SIP data sets, which were derived for chargeability by Debye...

With quasi-periodic microstructures, great enhancement of infrared light absorption of Au film over a broad wavelength band (2.7~15.1 μm) was realized experimentally for the first time. The microstructured Au film was prepared by replica molding of the surface of femtosecond (fs) laser microstructured silicon (black silicon). This unique absorption characteristic is mainly ascribed to good impe...

In this contribution a tunable via-free microstrip composite right/lefthanded transmission line (CRLH-TL) is designed and simulated. To add tunability RF MEMS elements are implemented in the interdigital capacitors and stub inductors, which match the line impedance during tuning. The via-free design enables easy and low-cost fabrication. Additionally, tunable zero-order resonators (ZORs) using ...

Improving data visualization paradigms for performance management is an orphaned area of tool development. Tool vendors avoid investing in development if they see no demand, while capacity planners and performance analysts do not demand what they have not conceived. We attempt to cut this Gordian knot with ’Barry’; a 3D performance visualization suite based on barycentric coordinates. Potential...

This paper presents the electromagnetic (EM) 3-D modeling, hardware measurement, and optimization of hybrid packaged electro-optical transmitters. The initial application is targeted for 10 Gb/s Ethernet and SONET fiber optic communication links. The hybrid package includes a micromachined silicon optical bench, a InP laser and monitor photodiode, a hermetically-sealed lid, integrated impedance...

An electronic amplifier, amplifier, or (informally) amp is an electronic device that increases the power of a signal. It does this by taking energy from a power supply and controlling the output to match the input signal shape but with a larger amplitude. Amplifier design relies on feedback mechanism. Offsets that accumulate in different stages of amplifier are corrected by feedback mechanism. ...

An important part of both comprehensibility and traceability is that the implementation resemble the design. As the design is refined to a concrete implementation, it is important that concepts have a clear correspondence to implementation artifacts – even if this mapping is not one-to-one. This holds true for crosscutting – or aspect-oriented – behaviors as well. We illustrate by investigating...