To obtain a tensile strain-hardening behavior by using the ordinary polypropylene (PP) fiber, micromechanical model recommends increase of fiber low interfacial bond with an cementitious matrix. It was predicted that alkali-activated slag (AAS) composite high drying shrinkage performance would affect interface frictional during pullout.

Elastic anisotropy exhibits spatial inhomogeneity in human cortical bone, but the structural origins of anatomic variation are not well understood. In this study, the elastic anisotropy of human cortical bone was predicted using a specimen-specific multiscale model that investigated the relative influence of apatite crystal orientations and intracortical porosity. The elastic anisotropy of cort...

resonators. Higher order means more complexity in design. A third-order high-Q 300 kHz micromechanical bandpass filter, with Q-adjustment and frequency tuning, is analyzed using a parameterized cell library, "NODAS," for schematic representation and behavioral HDL simulation. An equivalent SPICE model of the filter is derived, which enables simulation in SPICE and comparison to NODAS. Frequency...

Free-standing cantilevers, which directly translate specific biochemical reactions into micromechanical motion, have recently attracted much attention as label-free biosensors and micro/nano robotic devices. To exploit this mechanochemical sensing technology, it is essential to develop a fundamental understanding of the origins of surface stress. Here we report a detailed study into the molecul...

This paper presents an analysis of the major mechanical component (the thorax) of the micromechanical flying insect (MFI), a centimeter sized aerial vehicle currently in development at UC Berkeley. We present a description of the kinematics of the mechanism which converts piezoelectric actuation into complex 3D wing motion. A complete non-linear modeling of the system based on the Lagrangian en...

This paper describes recent developments on the model identification and attitude control system for a Micmmechanical Flying lnsect (MFI). We include recently developed dynamical models for the thorax actuatom and various sensor models. Wing kinematic parameterization scheme was designed to generate feasible wing motions to decouple the body torques under the constraints of the thorax model. A ...