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Hydroxyapatite (HAp) is a useful biocompatible material and is used for the surface coating of artificial bone. It has been reported that the oriented HAp promotes rapid recovery of the bone fracture[1], although most of coating HAp layers on the commercial artificial Titanium (Ti) bones are not oriented. As a new coating layer, our group has reported the highly oriented HAp film on Ti substrate fabricated...
Corrosion of metal alloys is very common in the industrial field, and failure to monitor the seriousness of corrosion can cause serious consequences. Compared with other Non-Destructive Testing methods, the method of ultrasonic surface wave testing has a lot of advantages including portability, efficiency, and un-contamination etc. This makes it a very promising method to evaluate or monitor chemical...
Progress in materials engineering has led to development of new materials with improved functional characteristics. One of the new types of materials introduced into industrial practice are plastics and polymers. These materials exhibit rheological (viscoelastic) properties, which combine simultaneously the properties of liquids and solids. Due to their attractive features, such as low specific weight,...
Skin stiffening is an early biomarker of many systemic sclerosis or fibrosis diseases. The Modified Rodnan Skin Score (MRSS) is considered the gold standard measurement in the majority of clinical studies of scleroderma or systemic sclerosis (SSc). However, the MRSS is a subjective palpation method. We have developed a noninvasive ultrasound surface wave elastography (USWE) technique for measuring...
Platelets are blood cells that play a critical role in a number of pathophysiological processes. After activation, platelets release a variety of growth factors, including PDGF, VEGF, TGF-β and HGF. Using different agonists, platelets can be selectively activated in different ways. For example, PAR-1 agonist activated platelets release VEGF while PAR-4 agonist activated platelets retain VEGF in them...
The availability of better air-coupled transducers have made possible many different applications. In particular, air-coupled ultrasound is a good solution for the inspection/study of flat/plate materials than can not be wetted by working in through transmission, but experience some problems with curved surfaces. Another successful application is for the generation/reception of Lamb waves using the...
Myocardial fibrosis is recognized as a physio-pathologic substrate of main cardiovascular syndromes such as myocardial infraction or heart failure. Knowing that fibrosis leads to increased myocardial stiffness, elastography techniques, such as shear wave imaging, has been showed to detect for the detection Fibrotic Tissue (FT) (Liver, arteries, …). However, its application on the heart still remain...
Recent analytical and numerical studies have shown that Electrical Bragg band gaps (EBBGs) may occur in piezoelectric plates poled along their thicknesses, with a 1D periodic array of electrodes on their two faces (Fig. 1) [C. Vasseur et al, Proceedings of 2016 IEEE IUS 2016, paper P3-C2-7, 4 pages]. These Bragg band gaps can be opened or closed by changing the electrical boundary conditions on the...
The progression of corrosion can be studied using continuous ultrasonic monitoring. A test rig was developed to artificially accelerate corrosion, and to ultrasonically monitor it on a real sample [1]. However, the corroded samples mostly underwent uniform corrosion, with low amounts of roughness. Non-uniform corrosion, or high surface roughness, prevents reliable ultrasonic thickness estimates. To...
Ultrasonography is not widely used in clinic for lung assessment because ultrasound cannot image deep lung tissue. We have developed a noninvasive technique termed lung ultrasound surface wave elastography (LUSWE) for measuring superficial lung tissue elastic properties. The purpose of this abstract is to demonstrate the clinical use of LUSWE for assessing patients with interstitial lung disease (ILD)...
Accurate knowledge of the electro-mechanical impulse response for each element in an ultrasound array is important for e.g. model-driven beamforming techniques, coded excitation, etc. Typically, one would use a hydrophone to measure the transmitted pulse of an element excited by a delta-pulse. However, hydrophone setups are expensive, the procedure time is costly, and the measurement is sensitive...
Selective application of shear forces on cells triggers stimulatory biological effects resulting in the manipulation of the cellular mechano-environment and the alteration of cell behavior. The acoustic radiation force (ARF) induced by focused ultrasound (FUS) can generate shear forces as in shear wave elastography imaging. The commonly used setups for in-vitro studies of ultrasound-induced mechanotransduction...
Growth control is an important technique in plant markets, for appropriate shipping time of plants (e.g., flowers and fruits) allows for reducing production costs for post harvesting storage and pesticide. It is favorable to control plant growth without any chemicals; physical stresses are attractive candidates for this purpose. Here, we propose an ultrasound-based technique to control plant growth.
Due to their enhanced properties with respect to conventional piezoelectric ceramics, 1–3 piezocomposite materials are predominant in high performance transducer applications. The determination of their effective electroelastic modulus has been the subject of numerous investigations. Simple modeling of the thickness mode is well documented in literature, however precise simple modeling of the full...
Skin stiffening is an early biomarker of many systemic fibrotic disorders. The Modified Rodnan Skin Score (MRSS) is considered the gold standard measurement in clinical studies of systemic sclerosis (SSc). However, the MRSS is a palpation method. We have developed a noninvasive ultrasound surface wave elastography (USWE) technique for measuring skin elastic properties. The purpose of this paper is...
This paper presents development of an automated contactless ultrasonic scanning measurement system for ultrasonic wavefield imaging of concrete elements. The system uses an air-coupled ultrasonic transducer for sending and a multi-channel MEMS ultrasonic air-coupled sensor array for sensing and thus enables rapid acquisition of ultrasonic wavefield data. The system requires neither physical contact...
The paper discusses modifications to the standard synthetic aperture focusing technique for improved imaging of concrete materials. Experimental evaluation was performed on three modifications to the velocity estimation, direct wave suppression, and attenuation compensation methods. Results show potential for improved performance beyond the standard imaging methods.
We have developed a noninvasive lung ultrasound surface wave elastography (LUSWE) technique for measuring superficial lung tissue stiffness. The purpose of this paper was to demonstrate the clinical use of LUSWE for assessing patients with interstitial lung disease (ILD). In LUSWE, a local 0.1s harmonic vibration is generated on the chest wall of a subject using a handheld vibrator. An ultrasound...
As one of the required functions in noncontact manipulation system of small part or droplet in air, coating of small ball is studied in this report. A small object with the diameter of several millimeters is levitated at the nodal position of sound pressure standing wave field excited in air at around 27 kHz. It is tried to coat the object with liquid sprayed through ultrasonic atomization. A self-oscillation...
Progress in materials science has led to development of new materials with improved functional characteristics. One of the new types of materials introduced into industrial practice are plastics and polymers. These materials exhibit rheological (viscoelastic) properties, which combine simultaneously the properties of liquids and solids. Due to their attractive features, such as low specific weight,...
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