A Reduced Three Dimensional Model for SAW Sensors Using Finite Element Analysis

A major problem that often arises in modeling Micro Electro Mechanical Systems (MEMS) such as Surface Acoustic Wave (SAW) sensors using Finite Element Analysis (FEA) is the extensive computational capacity required. In this study a new approach is adopted to significantly reduce the computational capacity needed for analyzing the response of a SAW sensor using the finite element (FE) method. The approach is based on the plane wave solution where the properties of the wave vary in two dimensions and are uniform along the thickness of the device. The plane wave solution therefore allows the thickness of the SAW device model to be minimized; the model is referred to as a Reduced 3D Model (R3D). Various configurations of this novel R3D model are developed and compared with theoretical and experimental frequency data and the results show very good agreement. In addition, two-dimensional (2D) models with similar configurations to the R3D are developed for comparison since the 2D approach is widely adopted in the literature as a computationally inexpensive approach to model SAW sensors using the FE method. Results illustrate that the R3D model is capable of capturing the SAW response more accurately than the 2D model; this is demonstrated by comparison of centre frequency and insertion loss values. These results are very encouraging and indicate that the R3D model is capable of capturing the MEMS-based SAW sensor response without being computationally expensive

Evolutions de la logistique à l'horizon 2025 : enjeux et impacts du Big data, de l'Intelligence Artificielle et de la Robotisation

Le présent rapport résulte d’une étude et analyse stratégique réalisées dans le contexte de la Conférence Nationale sur la Logistique.S’inscrivant dans la continuité des travaux du comité scientifique présidé par Michel SAVY, le rapport vise à éclairer les enjeux et les impacts du Big data, de l’Intelligence Artificielle et de la Robotisation sur le secteur de la logistique à l’horizon 2025.Ce document prend appui sur les connaissances du groupe de travail, les avis et les contributions des experts interrogés pendant la période de l’étude en juillet et août 2015.Sans prétendre à l’exhaustivité, il a vocation à apporter un éclairage sur les phénomènes à l’oeuvre et les tendances lourdes susceptibles de produire des transformations à moyen et long termes.Les éléments de ce rapport et les avis relayés ne valent pas position ou engagement des personnes interrogées

特集9 : 研究速報 : Trends in Nanoscale Science and Technology : Characterization of Thin Film Mechanical Properties

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特集8 : 研究速報 : Trends in Nanoscale Science and Technology : Nanocantilever Fabrication, Force Gradients and Local Elasticity Measurement

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特集7 : 研究速報 : Morphological Changes and Mechanical Properties of Thermally Fabricated Nanometric Oscillators

We are investigating the feasibility of using a three dimensional mechanical oscillator for detecting force and mass. The mechanical oscillator in question consists of a spherical mass supported by a filiform neck. Depending on the fabrication process, the mass can be as small as a few l0 nm to a few 100 nm. In this paper, we focus on the morphological changes observed during its fabrication by means of surface diffusion induced by heating of a sharpened metal tip. Some results on its mechanical properties will also be reported.小特集 マイクロマシ

ナノスケール科学技術における傾向 : 薄膜の機械的特性の測定

小特集 マイクロマシ