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 'mechanical impedance' in a sentence
mechanical impedance
Compositional variation reflects soil fertility and mechanical impedance more than moisture availability.
Robert W. Wernerehl, Thomas J. Givnish 2015, 'Relative Roles of Soil Moisture, Nutrient Supply, Depth, and Mechanical Impedancein Determining Composition and Structure of Wisconsin Prairies', PLOS ONE10.1371/journal.pone.0137963. Retrieved from PLOS CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Manipulative actions involving unstable interactions with the environment require controlling mechanical impedance through muscle co-contraction.
Daniele Borzelli, Benedetta Cesqui, Denise J. Berger, Etienne Burdet, Andrea d'Avella 2018, 'Muscle patterns underlying voluntary modulation of co-contraction', PLOS ONE10.1371/journal.pone.0205911. Retrieved from PLOS CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Free space and rigid constraints are singularities at the boundaries of a continuum of mechanical impedance.
Maura eCasadio, Maura eCasadio, Maura eCasadio, Assaf ePressman, Assaf ePressman,Sandro eMussa-Ivaldi, Sandro eMussa-Ivaldi 2015, 'Learning to push and learning to move: The adaptive control of contact forces', Frontiers in Computational Neurosciencehttp://journal.frontiersin.org/Journal/10.3389/fncom.2015.00118/full. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
In this research paper, the spatial heterogeneity of mechanical impedance of a typical chernozem was investigated.
Zhukov Alexander, Gadorozhnaya Galina 2016, 'Spatial Heterogeneity of Mechanical Impedance of Atypical Chernozem: The EcologicalApproach', Ekológia (Bratislava)http://www.degruyter.com/view/j/eko.2016.35.issue-3/eko-2016-0021/eko-2016-0021.xml?format=INT. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Soil compaction often creates combined physical stresses of drought, anaerobiosis, and mechanical impedance in field soil.
Morio Iijima, Junko Kato, Ayano Taniguchi 2007, 'Combined Soil Physical Stress of Soil Drying, Anaerobiosis and Mechanical Impedanceto Seedling Root Growth of Four Crop Species', Plant Production Sciencehttp://dx.doi.org/10.1626/pps.10.451. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
By introducing an effective mechanical impedance, the coupled electromechanical admittance formulations are derived using the piezoelectric constitutive equations.
Chunyuan Zuo, Xin Feng, Jing Zhou 2013, 'A Three-Dimensional Model of the Effective Electromechanical Impedance for an EmbeddedPZT Transducer', Mathematical Problems in Engineeringhttp://dx.doi.org/10.1155/2013/218026. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Drying stress without the increase of mechanical impedance was evaluated in a very loose pot soil environment.
Morio Iijima, Junko Kato, Ayano Taniguchi 2007, 'Combined Soil Physical Stress of Soil Drying, Anaerobiosis and Mechanical Impedanceto Seedling Root Growth of Four Crop Species', Plant Production Sciencehttp://dx.doi.org/10.1626/pps.10.451. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Here we assess the relative importance of soil moisture, nutrient supply, and mechanical impedance in determining prairie composition and structure.
Robert W. Wernerehl, Thomas J. Givnish 2015, 'Relative Roles of Soil Moisture, Nutrient Supply, Depth, and Mechanical Impedancein Determining Composition and Structure of Wisconsin Prairies', PLOS ONE10.1371/journal.pone.0137963. Retrieved from PLOS CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
These results indicate that muscle synergies (i.e., the balance of muscle mechanical impedance) are essential for motor control.
Hiroaki eHirai, Fumio eMiyazaki, Hiroaki eNaritomi, Keitaro eKoba, Takanori eOku,Kanna eUno, Mitsunori eUemura, Tomoki eNishi, Masayuki eKageyama, Hermano Igo Krebs,Hermano Igo Krebs, Hermano Igo Krebs, Hermano Igo Krebs, Hermano Igo Krebs 2015, 'On the origin of muscle synergies: invariant balance in the co-activation of agonistand antagonist muscle pairs', Frontiers in Bioengineering and Biotechnologyhttp://journal.frontiersin.org/Journal/10.3389/fbioe.2015.00192/full. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
The distance between experimental points in the mechanical impedance space was explained by means of multidimensional scaling.
Zhukov Alexander, Gadorozhnaya Galina 2016, 'Spatial Heterogeneity of Mechanical Impedance of Atypical Chernozem: The EcologicalApproach', Ekológia (Bratislava)http://www.degruyter.com/view/j/eko.2016.35.issue-3/eko-2016-0021/eko-2016-0021.xml?format=INT. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)