In this paper, a microelectromechanical system (MEMS) cantilever sensor was designed, modeled and fabricated to measure the terahertz (THz) radiation induced photoacoustic (PA) response of gases under low vacuum conditions. This work vastly improves cantilever sensitivity over previous efforts, by reducing internal beam stresses, minimizing out of plane beam curvature and optimizing beam dampin...

Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Abstract Cantilever sensors have attracted considerable attention over the last decade because of their potential a...

We demonstrate measurement and control of nanoscale single-asperity friction by using cantilever probes featuring an in situ solid-state heater in contact with silicon oxide substrates. The heater temperature was varied between 25 and 790 °C. By using a low thermal conductivity sample, silicon oxide, we are able to vary tip temperatures over a broad range from 25 ± 2 to 255 ± 25 °C. In ambient ...

In this study, we report a power management circuit for a combined piezoelectricelectrodynamic generator. A piezoelectric element is bonded to a spring steel cantilever beam and a magnet, used as tip mass, oscillates through a coil. This principle creates the combined generator. A test setup has been created to automate the characterization of the piezoelectric generator and its power managemen...

the static pull-in instability of beam-type micro-electromechanical systems is theoretically investigated. two engineering cases including cantilever and double cantilever micro-beam are considered. considering the mid-plane stretching as the source of the nonlinearity in the beam behavior, a nonlinear size-dependent euler-bernoulli beam model is used based on a modified couple stress theory, c...

Abstract Dental implant failure can be due to biological or technical problems. The incidence of body fracture is rare with less than 1.5% the reported cases. design, manufacturing defect, non‐passive fit prosthetic framework, and physiologic and/or biomechanical overload. We report a event combined abutment screws neck fixtures two implants restored fixed bridge in mandibular left first second...

In this paper, a plane quadrilateral element with rotational degrees of freedom is developed. Present formulation is based on a hybrid functional with independent boundary displacement and internal optimum strain field. All the optimality constraints, including being rotational invariant, omitting the parasitic shear error and satisfying Fliepa’s pure bending test, are considered. Moreover, the...

Abstract The paper presents the Structural Health Monitoring system installed on posttensioned concrete road bridge over Odra River in Poland. superstructure has a form of 5‐span box girder with skewed supports, built using cantilever method. During operation (since 2010) many cracks arrived superstructure, mainly within main span length 140 m. Therefore, as part complex diagnostic process, mon...

Abstract The response of slender bridge piers to horizontal actions may be significantly influenced by geometric nonlinearities. In such conditions, the use sophisticated models implemented in complex structural analysis software can economically disadvantageous, especially preliminary design phases. This paper proposes a simple numerical procedure compute nonlinear pushover cantilever subject ...

Abstract Multi-way data analysis has become an essential tool for capturing underlying structures in higher-order sets where standard two-way techniques often fail to discover the hidden correlations between variables multi-way data. We propose a multi-objective variational autoencoder (MO-VAE) method smart infrastructure damage detection and diagnosis sensing based on reconstruction probabilit...