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- Nicolás Pérez, Marco A. B. Andrade, Flávio Buiochi, Julio Cezar Adamowski
- IEEE Transactions on Ultrasonics, Ferroelectricsâ€¦
- 2010

Three-dimensional modeling of piezoelectric devices requires a precise knowledge of piezoelectric material parameters. The commonly used piezoelectric materials belong to the 6mm symmetry class, which have ten independent constants. In this work, a methodology to obtain precise material constants over a wide frequency band through finite element analysis ofâ€¦ (More)

- Nemesio PÃ©rez, R C Carbonari, Marco A. B. Andrade, Flávio Buiochi, Julio Cezar Adamowski
- Ultrasonics
- 2014

Numerical simulations allow modeling piezoelectric devices and ultrasonic transducers. However, the accuracy in the results is limited by the precise knowledge of the elastic, dielectric and piezoelectric properties of the piezoelectric material. To introduce the energy losses, these properties can be represented by complex numbers, where the real part ofâ€¦ (More)

- Joachim Reuder, Flavio Ghezzi, Eduardo Palenque, RenÃ© TÃ³rrez, Marco A. B. Andrade, Francesco Zaratti
- Journal of photochemistry and photobiology. Bâ€¦
- 2007

Measurements and model calculations have been performed to study the effect of high surface albedo on erythemally effective UV irradiance. A central part of the investigation has been a one week measurement campaign at Salar de Uyuni in the Southern part of the Bolivian Altiplano. The Salar de Uyuni, the largest salt lake of the world, is characterized byâ€¦ (More)

- Sebastian Baer, Marco A. B. Andrade, Cemal Esen, Julio Cezar Adamowski, G. Schweiger, Andreas Ostendorf
- The Review of scientific instruments
- 2011

The use of acoustic levitation in the fields of analytical chemistry and in the containerless processing of materials requires a good stability of the levitated particle. However, spontaneous oscillations and rotation of the levitated particle have been reported in literature, which can reduce the applicability of the acoustic levitation technique. Aimingâ€¦ (More)

- Georgios Skotis, Marco A. B. Andrade, Scott R Ritchie, D. S. R. Cumming, Mathieu O. Riehle, Anne L Bernassau
- 2015 IEEE International Ultrasonics Symposiumâ€¦
- 2015

Separation of cells is a critical process for studying cell properties, disease diagnostics, and therapeutics. Cell sorting by acoustic waves offers a means to separate cells on the basis of their size and physical properties in a label-free, contactless, and biocompatible manner. In this work, we introduce a unique technique, which use a dynamic acousticâ€¦ (More)

- Marco A. B. Andrade, Georgios Drosos Skotis, Scott R Ritchie, David R. S. Cumming, Mathis O Riehle, Anne L Bernassau
- IEEE Transactions on Ultrasonics, Ferroelectricsâ€¦
- 2016

This paper presents a contactless, acoustic technique to manipulate and sort particles of varying size in both liquid and air media. An acoustic standing wave is generated by the superposition of counterpropagating waves emitted by two opposing emitters. The acoustic radiation force traps the smallest particles at the pressure nodes of the acoustic standingâ€¦ (More)

- Marco A. B. Andrade, Julio Cezar Adamowski
- 2016 IEEE International Ultrasonics Symposiumâ€¦
- 2016

This paper presents the numerical determination of the acoustic radiation force that acts on a sphere in an acoustic levitation device formed by a 25 kHz ultrasonic transducer and a concave reflector. The acoustic radiation force is determined by two numerical models based on the Finite Element Method. In the first model, the acoustic pressure and velocityâ€¦ (More)

- Marco A. B. Andrade, Tiago S. Ramos, FÃ¡bio T A Okina, Julio Cezar Adamowski
- The Review of scientific instruments
- 2014

The nonlinear behavior of a 20.3 kHz single-axis acoustic levitator formed by a Langevin transducer with a concave radiating surface and a concave reflector is experimentally investigated. In this study, a laser Doppler vibrometer is applied to measure the nonlinear sound field in the air gap between the transducer and the reflector. Additionally, anâ€¦ (More)

- Marco A. B. Andrade, Julio Cezar Adamowski, Alberto IbaÃ±ez, Montserrat Parrilla, Carlos Fritsch
- 2009 IEEE International Ultrasonics Symposium
- 2009

The non-destructive testing of complex shape parts is usually performed in immersion. In state of the art phased array equipments an image consists of a set of scan lines where dynamic depth focusing is performed in reception. To achieve the highest resolution and sensitivity, the scan lines should coincide with the path of maximum acoustic field intensityâ€¦ (More)

- Gergely Simon, Marco A. B. Andrade, D. Roolvink, Peter A.G. Cormack, Mathieu O. Riehle, Anne L Bernassau
- 2016 IEEE International Ultrasonics Symposiumâ€¦
- 2016

This paper investigates the dynamic acoustic sorting method from a theoretical perspective. Analytical equations of motion and numerical simulations have been used to optimize parameters for sorting various particle mixtures. The effect of changes in field parameters as frequency or voltage on efficient sorting has been investigated. Experiments have beenâ€¦ (More)