Recently, the demand which wants to control the health by measuring body information such as blood pressure, body temperature, and pulse number increases. In jogging and under walking, there is a ...case in which the healthy subject harms the health. In this paper, the method for noninvasively measuring pulse wave using strain gauge is proposed and the development of the equipment was tried. As the result, this equipment measured ejective wave by the ejection of the blood from the heart, tidal wave from the bifurcation of arterial vessel, incisura wave (dicrotic wave) by the closure of aortic valve. Amplitude and shape of the signal waveform from 3 channel sensors are different. In the measurement by this equipment, the waveform of tidial wave and dicroric wave has appeared clearly in comparison with the equipment of the marketing. In addition, the signal waveform is variable in the existence of the motion. AI value and attractor were clarified from the data. The attractor of rest condition and exercise condition can be clearly distinguished.
Thermoacoustic Cooling for Surface Combatants Johnson, R. A.; Garrett, S. L.; Keolian, R. M.
Naval engineers journal,
July 2000, Letnik:
112, Številka:
4
Journal Article, Conference Proceeding
Recenzirano
Thermoacoustic cooling technology uses high amplitude acoustic standing waves in inert gasses to pump heat It requires no toxic, ozone-depleting, or global warming gasses and has few or no moving ...parts, no sliding seals and requires no lubrication for robust and very
low maintenance operation. Thermoacoustic cooling units have been demonstrated aboard the Space Shuttle in 1992 and aboard the USS Deyo (DD 989) in 1995 to cool radar electronics. Currently, a 3-ton electrically driven unit is being built for shipboard application.
This 3-ton unit will enable the ship designer to provide greater combat system sur-vivability through distributed system architecture and reduced manning by unit simplicity and resulting high reliability. Additionally, waste heat cooling is an emerging thermoacoustic technology
that could utilize stack gas heat from main gas turbine engines or from gas turbines generators to create shipboard cooling. The benefits of this waste heat cooling is lower infrared (IR) signature and reduced fuel consumption.
The guided wave technique is applied to slope stability monitoring to overcome the high attenuation characteristics of acoustic emission propagation in rock and soil materials. The shear tests of ...“guided wave meter” (GWM) with different deformation rates were carried out, and the effects of the material and particle size of the coupling medium and the diameter of the waveguide rod on the flexural guided wave ring down count were studied, and the relationship between the deformation rate of the slope and the flexural guided wave parameters was analyzed. The results show that the flexural guided wave ring down count rate increases with the increase of deformation in the loading process. The GWM filled with quartz sand particles produces more flexural guided wave ring down counts than those filled with gravel particles. From the twelve groups of GWM shear tests, it can be seen that the GWM with the combination of 16 mm waveguide rod and 4–8 mm quartz sand produces the highest cumulative flexural guided wave ring down counts. The combination is used as an optimized GWM. By applying different deformation rates to the optimized GWM, it was found that the flexural guided wave ring down count rate at different deformation rates tended to increase and was distributed in a fan shape. The cumulative flexural guided wave ring down count has an excellent linear correlation with the deformation. The slope of the cumulative ring down count curves and the deformation curves are obtained separately, which shows that the deformation rate has an excellent linear relationship with the slope of the cumulative ring down count curve, and the slope of the cumulative ring down count curve increases with the increase of the deformation rate. It provides theoretical guidance for quantifying the slope deformation rate using the flexural guided waves.
On-Chip Microdisk Resonator Wave-Meter Sun, Jianfei; Guo, Xuhan; Su, Yikai
2023 Asia Communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings (ACP/POEM),
2023-Nov.-4
Conference Proceeding
In this paper, we demonstrate an on-chip wave-meter integrated on silicon on insulator platform, implemented using microdisk resonators based on whispering gallery modes. The device exhibits the ...advantages of high integration, a small footprint, and robust resistance to environmental interference. The utilization of machine learning classification algorithms enables achieving high resolution and accuracy in spectral analysis.
When the natural light waves travel into the interface between water and air a part of the light waves refracts and diffracts at the interface. When these waves travel to the horizontal observation ...plane located at the bottom of the water these waves make the light intensity profile in this observation plane. It is possible to calculate the wave profile by applying Suzuki-Sumino's method to the light intensity profile observed at the bottom in the shallow water. When it becomes deeper the wave profile can be estimated using the relation between the gradient of the water surface and the intensity gradient of light observed at the bottom.
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