For investigating human transcranial ultrasound imaging (TUI) through the temporal bone, an intact skull is needed. Since it complex and expensive to obtain one, requires that experiments are performed without excision or abrasion of skull. Besides, mimic blood circulation for vessel target, cellulose tubes generally fit simulation with straight linear features. These issues, which limit experimental studies, can be overcome by designing a 3-D-printed model acoustic dimensional properties...

Pulse-inversion subharmonic (PISH) imaging can display information relating to pure cavitation bubbles while excluding that of tissue. Although plane-wave-based ultrafast active (UACI) monitor the transient activities bubbles, its resolution and cavitation-to-tissue ratio (CTR) are barely satisfactory but be significantly improved by introducing eigenspace-based (ESB) adaptive beamforming. PISH UACI a natural combination for activity in tissue; however, it raises two problems: 1) ESB...

The plunger valve has an important role in a large compressor system as its operating characteristics directly affect the aerodynamic boundary condition of equipment. In this study, dynamic modeling and analysis method are proposed for accurate control system. By considering interaction between flow actuator action, lumped parameter model fluid–structure force multibody developed based on intrinsic correlation parameters. A combination to simultaneously predict is proposed. predicted results...

Adaptive beamforming, such as the fast minimum variance (FMV)algorithm, has been developed to improve contrast-to-noise ratio (CNR)in plane wave imaging with extremely reduced computation. However, in ultrasound trans cranial imaging, FMV will be confronted challenges raised by echoes low intensities, especially when calculating beamformer contributions at points which are a distance from beam center line. In order CNR and resolution echo beamforming during this paper proposed an adaptive...

In recent years, cavitation is increasingly utilized in a wide range of applications biomedical field. Monitoring the spatial-temporal evolution bubbles great significance for efficiency and safety applications. this paper, several acoustic methods mapping proposed or modified on basis existing work will be presented. The novel ultrasound line-by-line/plane-by-plane method can depict distribution with high spatial temporal resolution may developed as potential standard 2D/3D field method....

Adaptive beamforming methods, most based on the minimum variance(MV), are widely used in medical ultrasound imaging because of their significant improvement image quality, especially resolution, compared with conventional delay-and-sum(DAS) beamformer. Recently, a new eigenspace-based MV(EIBMV) beamformer has been proposed to enhance contrast which is not satisfactory MV beamforming, by utilizing eigenstructure covariance matrix. principal component analysis was introduced solve problem...

The ultrafast active cavitation imaging (UACI) based on plane wave can be implemented with high frame rate, in which adaptive beamforming technique was introduced to enhance resolutions and signal-to-noise ratio (SNR) of images. However, regular continuously updates the spatial filter for each sample point, requires a huge amount calculation, especially case sampling and, moreover, 3D imaging. In order achieve UACI rapidly satisfactory resolution SNR, this paper proposed an basis compressive...

Impact experiment of a set steel/RC composite beams was conducted. To consider the influence local impact residual deformation, transient response investigated using elastic-plastic contact law. Experiments show that main failure mode is related to value potential energy impacter and dissipation capacity sand cushion. Each theoretical analysis result slightly less than its corresponding experimental value. Experimental values results present maximum displacement steel strain on lower layer...

For transcranial imaging based on contrast microbubbles, the acoustic window is limited to temporal bone with strong attenuation. Consequently, images obtained conventional compounded plane waves (CPW)transmission often not good in contrast-to-noise ratio (CNR). This partly attribute that short pulse commonly has low ability penetrate bone. And moreover, CPW will raise a shadow area relatively deep field where beams are overlapped. Although this can be improved by increasing numbers of...

This paper reports an electrical and optical characterization study of atmospheric pressure plasma generator used for decontaminating endoscopic channels. In order to sustain such in a narrow channel up one meter, two electrode configurations are discussed. Plasma characteristics as the discharge current, dissipated power, gas temperature measured, together with emission spectroscopic measurements. These seek optimal conditions by means scoping range composition, flow rate, excitation...