Warren P. Mason’s scientific contributions

... C/m 2 , e 33 = 15.1 C/m 2 , ε 33 = 5.62 × 10 −9 C 2 /(N·m 2 ), p 33 = 2.5 × 10 −5 C/(m 2 ·K), α r = 2.0 × 10 −6 K −1 , λ 11 = 4.738 × 10 5 N/(m 2 ·K), and λ 33 = 4.529 × 10 5 N/(m 2 ·K). All these material constants can be found in Mason (1961) and Tzou and Ye (1994) except λ ii , which can be calculated from the elastic constants c ij and the linear thermal expansion coefficients α i , see Eq. (3). For the sake of comparison, we also consider a purely elastic hollow sphere with the same material constants as given above. ...

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Dynamic response of a pyroelectric hollow sphere under radial deformation

... A piezo actuator is used in astrophysics for image stabilization and scan system. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Frequency method for determination self-oscillations in scan system is applied. for Nyquist stability criterion of selfoscillations at harmonious linearization of hysteresis characteristic of a piezo actuator. ...

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Frequency method for determination self oscillations in control systems with a piezo actuator for astrophysical research

... Ultrasonic waves have been used in different fields such as biochemistry, medical, engineering, plastics and polymers. 1 The effects of ultrasonic waves on mineral processing applications have also been investigated. These investigations have shown that ultrasonic waves affect the flotation performance positively, for example, by causing better dispersion and emulsification of collectors, 2 and by removing slime layers coated on mineral surfaces. ...

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Effect of ultrasonic treatment on flotation of calcite, barite and quartz

... The bandwidth of piezoelectric filters and transducers is dependent upon the appropriate coupling factor. Different materials can directly be compared for the same application from their coupling factors without knowledge of their sets of elastic dielectric and piezoelectric constants [25]. In high frequency filters (GHz range) the thickness of the film is only a few microns with much larger lateral dimensions so a film supporting structure is required. ...

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The Potential of Reactively RF Sputtered ZnO Thin Films for the Fabrication of Microwave Filters