a measure of the opposition to the flow of an alternating current equal to the square root of the sum of the squares of the resistance and the reactance, expressed in ohms
Symbol: Z
2.
a component that offers impedance
3. Also called: acoustic impedance
the ratio of the sound pressure in a medium to the rate of alternating flow of the medium through a specified surface due to the sound wave
Symbol: Za
4. Also called: mechanical impedance
the ratio of the mechanical force, acting in the direction of motion, to the velocity of the resulting vibration
Symbol: Zm
Examples of 'acoustic impedance' in a sentence
acoustic impedance
Acoustic impedance test was performed in 340 centenarians (668 ears).
Jianhui Li, Hui Zhao, Bangqing Huang, Shanshan Zhang, Kaihua Sun, Xinying Jiang, FuxinLuan 2018, 'A survey on hearing acuity of centenarians in Hainan Province', Journal of Otologyhttp://www.sciencedirect.com/science/article/pii/S1672293018300734. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
The amplitudes of back wall echo increases with increasing acoustic impedance of the couplant.
Shivamurthy B., Krishnamurthy, Sachidanada H. K. 2018, 'Case study on water based cellulose couplant in contact type ultrasonic testing',MATEC Web of Conferenceshttps://doi.org/10.1051/matecconf/201714402016. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
A multilayered transmission and reflection model was used to calculate the acoustic impedance.
Jun Zhang, Yi Zhang, Yang Li, Ruimin Chen, K. Kirk Shung, Grace Richter, Qifa Zhou 2017, 'Correlation of IOP with Corneal Acoustic Impedance in Porcine Eye Model', BioMed Research Internationalhttp://dx.doi.org/10.1155/2017/2959717. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Acoustic pressure and specific acoustic impedance were obtained within the fuel feed line.
Yu-In Jin, Hyun-Gull Yoon 2013, 'Study on Dynamic Responses of a Screw-Type Pressure-Swirl Injector under Low FrequencyPressure Oscillation', International Journal of Spray and Combustion Dynamicshttps://doi.org/10.1260/1756-8277.5.4.291. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
The flow model ensures the correct estimation of the acoustic impedance of the two-phase media.
Domergue L., Hadjadj A., Chinnayya A., Prete E. Del, Haas J.-F., Imbert B. 2011, 'Modeling of aqueous foam blast wave attenuation', EPJ Web of Conferenceshttp://dx.doi.org/10.1051/epjconf/20101000035. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
The linear relationship between acoustic impedance and intraocular pressure was analyzed by statistical method.
Jun Zhang, Yi Zhang, Yang Li, Ruimin Chen, K. Kirk Shung, Grace Richter, Qifa Zhou 2017, 'Correlation of IOP with Corneal Acoustic Impedance in Porcine Eye Model', BioMed Research Internationalhttp://dx.doi.org/10.1155/2017/2959717. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Through seismic attributes and acoustic impedance inversion, four large areas of favorable karst reservoirs are predicted.
Xiaofeng DAI, Ming ZHANG, Qingchun JIANG, Zhou FENG 2017, 'Karst reservoirs seismic prediction of Lower Permian Maokou Formation in central SichuanBasin, SW China', Petroleum Exploration and Developmenthttp://www.sciencedirect.com/science/article/pii/S1876380417300101. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
By numerical examples we illustrate this novel approach of modeling the acoustic impedance of perforated interfaces.
Lukeš V., Rohan E. 2007, 'Modelling of acoustic transmission through perforated layer', Applied and Computational Mechanicshttp://www.kme.zcu.cz/acm/old_acm/full_papers/acm_vol1no1_p016.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Physical examination, pure tone audiometry and acoustic impedance test were performed, and the results were analyzed.
Jianhui Li, Hui Zhao, Bangqing Huang, Shanshan Zhang, Kaihua Sun, Xinying Jiang, FuxinLuan 2018, 'A survey on hearing acuity of centenarians in Hainan Province', Journal of Otologyhttp://www.sciencedirect.com/science/article/pii/S1672293018300734. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)