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Improving post-EVAR surveillance with a smart stent-graft

Abdominal aortic aneurysms (AAA or triple A’s) are indolent and deadly diseases. Their treatment options involve either an invasive procedure or a minimally invasive one. When the minimally invasive procedure, endovascular aneurysm repair (EVAR), was introduced, it revolutionized the treatment of AAA’s due to advantages such as shortened hospital stays and reduced costs. As EVAR requires periodic im...

Study of Pressure Sensors Placement using an Abdominal Aortic Aneurysm (AAA) Model

An Abdominal Aortic Aneurysm (AAA) model for post-EVAR (endovascular aneurysm repair) analysis, including the blood flow, the bifurcated stent-graft, the aorta aneurysm wall motion and the stagnant blood inside the aneurysm sac, was built and solved using a Fluid Structure Interaction (FSI) code. The post-EVAR analysis aims to check the feasibility of EVAR surveillance using a remote pressure sensor, and the st...

A Pull-in Based Test Mechanism for Device Diagnostic and Process Characterization

A test technique for capacitive MEMS accelerometers and electrostatic microactuators, based on the measurement of pull-in voltages and resonance frequency, is described. Using this combination of measurements, one can estimate process-induced variations in the device layout dimensions as well as deviations from nominal value in material properties, which can be used either for testing or device diagnostics purp...

Auto-calibrated Capacitive MEMS Accelerometer

Capacitive MEMS Accelerometers Testing Mechanism for Auto-Calibration and Long-...

O gênero Pythium Pringsheim de áreas de cerrado no Estado de São Paulo, Brasil

Foram coletadas amostras de água e solo em áreas de cerrado no Estado de São Paulo, Brasil, de fevereiro/1999 a fevereiro/2001. Estas amostras foram trazidas ao laboratório e tratadas segundo a técnica de iscagem múltipla. Dentre os fungos pitiáceos isolados, nove espécies pertencem ao gênero Pythium Pringsheim: Pythium echinulatum Matthews, P. graminicolum Subramanian, P. irregulare Buisman, P. rostratum Butle...