Papers – Page 933 – TechConnect Briefs

Converging Technologies (NBIC)

Bainbridge W.S., National Science Foundation, US

The convergence of nanotechnology, biotechnology, information technology and cognitive science can greatly improve human performance over the next ten to twenty years. The chief areas of application include: expanding human cognition and communication, improving human [...]

Coarse-Grained Molecular Dynamics for Nano-Design

Rudd R.E., Lawrence Livermore National Laboratory, US

The design of nanoscale mechanical systems poses a novel set of challenges for modeling and simulation. The need for an accurate model of the nanoscale components is clear. This can be of the form of [...]

A Numerical Model of Viscoelastic Flows in Microchannels

Trebotich D., Colella P., Miller G., Liepmann D., Lawrence Livermore National Laboratory, US

We present a numerical method to model non-Newtonian, viscoelastic flow at the microscale. The equations of motion are the incompressible Navier-Stokes equations coupled with the Oldroyd-B constitutive equation. This constitutive equation is chosen to model [...]

Evolving Molecular Force Field Parameters for Si and Ge

Globus A., Ricks E., Menon M., Srivastava D., CSC at NASA Ames, US

A genetic algorithm (GA) has been developed to fit parameters for multi-species reactive inter-atomic force field functions. While GA has successfully parameterized force fields in the past [Hunger, Beyreuther, Huttner, Allinger, Radelof, Zsolnai (1998), Hunger, [...]

Nonlinear Dynamical Aspects of Atomic Scale Friction

Conley W.G., Raman A., Krousgrill C.M., Purdue Univerrsity, US

This work presents a detailed computational and analytical investigation of Tomlinsons model for atomic scale dry friction [1]. The model (Figure 1) describes a prototypical mechanism of energy dissipation from an atom dragged across a [...]

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 [...]

A Novel Grid Adaptation Procedure for Stationary 2D Device Simulation

Schmithusen B., Gartner K., Fichtner W., Integrated Systems Laboratory, ETHZ, CH

A novel anisotropic grid adaptation procedure for the stationary 2D drift-diffusion model in semiconductor device simulation is presented. The adaptation approach is based on the principle of equidistributing local dissipation rate errors and suitable for [...]

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 [...]

System Level Analysis for a Locomotive Inspection Robot with Integrated Microsystems

Jeong Y., Kim B., Oh H., Park J-O, Korea Institute of Science & Technology, KR

In this paper, we describe a locomotive inspection robot with integrated microsystems that comprises a micro pump, micro valves, micro channels, a sophisticated pressure amplification system with multi-bellows and biocompatible linear actuators with plastic coated [...]

Model for Flow Resistance of a Rare Gas Accounting for Surface Roughness

Veijola T., Helsinki University of Technology, FI

The contribution of surface roughness is included in the flow resistance of rare gas flow channels. The statistical properties of the surface are taken into account in the model applying a novel approximation for the [...]