Papers – Page 6 – TechConnect Briefs

Electroosmotic Flow in a Tube or Channel for Non-Negligible Zeta Potentials

Griffiths S.K., Nilson R.H., Sandia National Laboratories, US

Numerical methods based on a shooting technique are employed to determine the electric potential and fluid velocity in a tube and channel when the zeta poten- tial is not small. In addition, new analytical solutions [...]

Analysis of Sample Injection and Band-Broadening in Capillary Electrophoresis Microchips

Krishnamoorthy S., Giridharan M.G., CFD Research Corporation, US

An implicit finite-volume numerical scheme has been developed to solve the three-dimensional transport equations that govern the electroosmotic and electrophoretic phenomena. The scheme consists of solving the ion transport equation and electro-neutrality condition coupled with [...]

A Fast Stokes Solver for Generalized Flow Problems

Ye W., Wang X., White J.K., Massachusetts Institute of Technology, US

Computing drag forces on geometrically complicated 3-D micromachined structures, such asan entire comb resonator, is a challenging problem. The recently developed FastStokes solver, based on precorrected-FFT accelerated iterative methods, has made analyzing such problems much [...]

Discrete Impurity Effects in Silicon Quantom Dots

Milicic S.N., Vasileska D., Akis R., Gunther A., Goodnick S.M., Arizona State University, US

We have developed efficient self-consistent 3D Schrodinger-Poisson solver to model the energy level spectrum in silicon quantum dots. We find that the energy level spectrum in the dot can be easily tuned by varying the [...]

A Mathematical Model for Process Control in Laser Chemical Vapor Deposition

Nassar R., Dai W., Zhang C., Lan H., Maxwell J., Louisiana Tech University, US

Laser chemical vapor deposition is a free form technique capable of producing high aspect ratio microstructures of arbitrary shape. The process does not yet have a high resolution required for microfabrication. For this study, we [...]

Closed-Loop, Neural Network Controlled Accelerometer Design

Gaura E.I., Ferreira N., Rider R.J., Steele N., Coventry University, UK

In this paper, a closed-loop, smart transducer design is proposed, based on artificial neural network (ANN) techniques. The design aims to improve the performance of open-loop, off-the-shelf capacitive acceleration sensors and increase their robustness to [...]

Nonlocal Problems in MEMS Device Control

Pelesko J.A., Triolo A.A., Georgia Institute of Technology, US

Perhaps the most ubiquitous phenomena associated with electrostatically actuated MEMS devices is the "pull-in" voltage instability. In this instability, when applied voltages are increased beyond a certain critical voltage there is no longer a steady-state [...]

A Novel Approach to Simulate the Potential at the Center Axis of Poisson’s Equation in Cylindrical Coordinates for Plasma Immersion Ion Implantation Processes

Kwok D.T.K., Zeng Z.M., Chu P.K., City University of Hong Kong, CN

A novel and practical method is developed to resolve the three dimensional Poisson’s and Laplace’s equation at the center axis in cylindrical coordinates. The method employs the rectangular xyz co-ordinates to solve the potential f [...]

Finite Element Based Electrostatic-Structural Coupled Analysis with Automated Mesh Morphing

Zhulin V.I., Owen S.J., Ostergaard D.F., ANSYS, Inc., US

A co-simulation tool based on finite element principles has been developed to solve coupled electrostatic-structural problems. An automated mesh morphing algorithm has been employed to update the field mesh after structural deformation. The co-simulation tool [...]

Co-simulation and Optimization Micro Electro Mechanical Systems by Using Method of Theoretical Investigation

Mkrttchian V., State Engineering University of Armenia, AM

Before elaboration and designing of micro electromechanical systems (MEMS) it is very important to carry out an appropriate computer modeling for analyzing and optimizing. To describe adequately the physical phenomenon talking place in MEMS it [...]