US – Page 412 – TechConnect Briefs

Fast Methods for Biomolecule Charge Optimization

Bardhan J.P., Lee J-H., Kuo S.S., Altman M.D., Tidor B., White J.K., Massachusetts Institute of Technology, US

We report a Hessian-implicit optimization method for linearly constrained quadratic programs. Our research focuses on the energetics of protein-protein interactions, and this method was developed to quickly solve the charge optimization problem: given a ligand [...]

System Model for MEMS based Laser Ultrasonic Receiver

Wilson W.C., NASA Langley Research Center, US

This paper investigates the system modeling of a MOEMS based Laser Ultrasonic receiver system. See Figure 1 for a block diagram of the system. The LUT receiver is comprised of a laser, and an optical [...]

MEMulator: A fast and accurate Geometric Modeling, Visualization and Mesh Generation Tool for 3D MEMS Design and Simulation

Udeshi T., Parker E., Zyvex Corporation, US

We present novel voxel-based algorithms and their application to Micro Electro Mechanical System (MEMS) design and simulation. Voxel-based techniques are known for their robustness and flexibility and have been used for MEMS design and simulation. [...]

Static and Dynamic Analysis of Silicon NEMS

Tang Z., Aluru N.R., University of Illinois, US

Microelectromechanical systems (MEMS) have already revolutionized many areas including communications, information technology, medical, mechanical and aerospace technologies. Nanoelectromechanical systems (NEMS) are MEMS with submicron critical dimensions. NEMS have the potential to fundamentally change the way [...]

A Systematic Approach to Macromodeling Complex MEMS Devices

Casinovi G., Georgia Tech, US

This paper describes a modeling methodology for arbitrary MEMS devices based on the concept of element stamps. Previously published work has shown that element stamps can be used profitably to build models of MEMS devices [...]

Size and Strain Rate Effects in Tensil Deformation of Cu Nanowires

Liang W., Zhou M., Georgia Institute of Technology, US

Nanoscale plasticity has drawn significant attention in recent years. Extensive Experimental and numerical studies have been conducted in this field. In previous molecular dynamics (MD) simulations, the Nose-Hoover isothermal procedure was often used to maintain [...]

Air Damping in an Ultra-High-Frequency Disk Resonator

Yap L.K., Yap L.Y., Yap L.K., Yap L.Y., Ye W., Georgia Institute of Technology, US

In this paper we investigate the air damping in a circular disk radially oscillating at 1GHz. First the compressibility effects of air between the disk and the substrate are studied. The pressure perturbation along the [...]

Superharmonic Resonance of an Electrically Actuated Resonant Microsensor

Abdel-Rahman E.M., Nayfeh A.H., Virginia Polytechnic Institute and State University, US

We investigate the response of a microbeam-based resonant sensor to a superharmonic electric actuation. The model incorporates the nonlinearities associated with moderately large displacements and electric forces. The method of multiple scales is used to [...]

Symmetry and Symmetry Breaking in Electrostatically Actuated MEMS

Pelesko J.A., Bernstein D.H., McCuan J., University of Delaware, US

We investigate the symmetry of solutions to the small aspect ratio approximate model of electrostatic actuation. We find that for an annular shaped domain asymmetric solutions may occur.

Very Large Scale Integration of MOEMS Mirrors, MEMS Angular Amplifiers and High-voltage, High-density IC Electronics for Photonic Switching

Bryzek J., Nasiri S., Flannery A., Kwon H., Novack M., Marx D., Sigari El, Chen E., Garate J., Transparent Networks, US

The demand for communication bandwidth together with advances in MEMS (micro-electro-mechanical systems) technology has spurred rapid development in the field of MOEMS (micro-optical-electrical mechanical systems). One exciting opportunity is in the area of photonic switching. [...]