Results 11 to 20 of about 6,445 (164)

Miniature photonic-crystal hydrophone optimized for ocean acoustics

, 2010
This work reports on an optical hydrophone that is insensitive to hydrostatic pressure, yet capable of measuring acoustic pressures as low as the background noise in the ocean in a frequency range of 1 Hz to 100 kHz.
Gordon S. Kino, Kim S., Knudsen V. O., Michel J. F. Digonnet, Olav Solgaard, Onur Kilic, Peng G. D., Škvor Z.   +7 more
core   +1 more source

Methodology Of Experimental Investigations Of Valve Operation [PDF]

, 2019
Tightness, as well as the reliability of the valve plate, is a complex property of the effective operation of compressor cylinders of the first stage and, in general, gas-engine reciprocating compressors.
Seyidahmadov, N. S. (Natig)
core   +3 more sources

Multiphysics Modeling of a Synthetic Jet Actuator in Operation

Actuators
Active flow control is a promising technology for reducing noise, emissions, and power consumption in various applications. To better understand the performance of synthetic jet actuators, a computational model that couples structural mechanics with ...
Matthew G. M. Butler, Alis Ekmekci, Pierre E. Sullivan   +2 more
doaj   +1 more source

Constant-pressure sound waves in non-Hermitian disordered media

, 2018
When waves impinge on a disordered material they are back-scattered and form a highly complex interference pattern. Suppressing any such distortions in the free propagation of a wave is a challenging task with many applications in a number of different ...
Brandstötter, Andre, Fleury, Romain, Lissek, Hervé, Makris, Konstantinos G., Rivet, Etienne, Rotter, Stefan   +5 more
core   +2 more sources

Advances in Symbiotic Bioabsorbable Devices

Advanced Science, EarlyView.
This review focuses on recent advances in bioabsorbable devices. This review concludes innovation at the material, device, and system levels, the significant advances toward biomedical applications. This review discusses and highlights the challenges and trends in symbiotic bioresorbable electronics, and provides a new direction for the development of ...
Chang Zhu, Engui Wang, Zhou Li, Han Ouyang   +3 more
wiley   +1 more source

Towards the noise reduction of piezoelectrical-driven synthetic jet actuators [PDF]

, 2014
This paper details an experimental investigation aimed at reducing the noise output of piezoelectrical-driven synthetic jet actuators without compromising peak jet velocity.
Anderson D. F., Arik M., Bargsten C.J., Belvins R.D., Bies D.A., Clarke C., European Commision, Flynn K.P., Godard G., Godard G., Gomes L.D., Jabbal M., Jain M., Kopiev V.F., Li R., Lin F., Nastase I., Norton M. P., Tide P.   +18 more
core   +1 more source

State of the Art of Low‐Frequency Acoustic Modulation: Intensity Enhancement and Directional Control

Advanced Science, EarlyView.
High intensity low‐frequency sound sources hold significant value in many fields. However, their long wavelength, strong penetrability, and tendency to diffract make direction control and intensity enhancement challenging. Acoustic generators and metamaterial‐based acoustic devices still face issues such as low energy efficiency, poor directional ...
Jingsong Xu, Yunfeng Ye, Tao Dong, Zhaochu Yang, Nuno Miguel Matos Pires, Yu Zhou, Fuyu Tao, Jin Wang, Junshan Zhang, Guoxi Luo, Libo Zhao, Qi Mao, Yangtao Wang, Zhuangde Jiang   +13 more
wiley   +1 more source

Experimental measurement of the nonlinearities of electrodynamic microphones [PDF]

, 2009
International audienceThis paper presents an experimental way of characterizing the nonlinearities of electrodynamic microphones used as acoustical sources. This functioning occurs for reciprocal calibration techniques.
Lemarquand, Guy, Ravaud, Romain, Roussel, Tangi   +2 more
core   +3 more sources

Localized Sound‐Integrated Display Speaker Using Crosstalk‐Free Piezoelectric Vibration Array

Advanced Science, EarlyView.
To approach multisensory integration of speaker‐integrated OLED displays, this study investigates localized sound emission in display panel speakers by examining crosstalk‐free diaphragm vibrations and enhanced frequency response through multi‐arrayed piezoelectric exciters.
Inpyo Hong, Su Seok Choi
wiley   +1 more source

Optical communications system Patent [PDF]

, 1969
Specifications and drawings for semipassive optical communication ...
Thomas, N. E.
core   +1 more source