On the macro scale, feedback control is routinely applied to improve performance and enable new tasks in complex and uncertain systems operating in noisy environments. Our lab has focused on applying feedback control ideas to systems on the micro scale. Here we show how control methods can improve existing performance in the UCLA lab-on-a-chip electrowetting system and can create entirely new capabilities in our 'micro fluidic tweezers' cell steering devices.In the Electro-Wetting-On-Dielectric (EWOD) system developed at UCLA by CJ Kim, a grid ....etc

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In this publication laser micro polishing with an additional laser beam for pre-heating of the surface is investigated.The influence of the following process parameters on the surface roughness is examined: Pre-heating laser power, scanning velocity, beam offset of the two laser beams, and intensity distribution of the pre-heating laser beam. The two materials which were used for the experiments (martensitic tool steel and TiAl6V4) showed a different behavior: For martensitic tool steel the micro roughness was increased in comparison to convent ....etc

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automatic shoe polishing machine ppt

Shoe polish (or boot polish), is a waxy paste, cream, or liquid used to polish, shine, and waterproof leather shoes or boots to extend the footwear's life, and restore, maintain and improve their appearance.Various substances have been used as shoe polish for hundreds of years, starting with natural substances such as wax and tallow. Modern polish formulas were introduced early in the 20th century and many of those original formulations are still in use today. Today, shoe polish is usually made from a mix o ....etc

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laser cleaning of micro slots and cracks

Abstract
Thermal based laser surface cleaning could strongly depend on the temporal pulse shaping of laser. In this study, we have investigated, based on a Finite Element Method (FEM), the effects of different temporal pulses (Excimer laser, 248 nm, 26 ns), including rectangular and Gaussian shapes, in laser cleaning of microtapered slots covered by oil film (1.0 m thick). The FEM model was verified with an analytical solution for a flat surface, and then applied to the tapered micro-slots structure. P ....etc

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pulsed leaser micro polishing seminar report and ppt

Abstract:

A fundamental study of pulsed laser micro polishing (PL P) was conducted as a method for reducing surface roughness of micro/meso-scale metallic parts. Although PL P was shown to be an effective process at these scales, the knowledge of the process physics lacked thoroughness. The goal of this work, therefore was to improve upon the existing knowledge of PL P, with focus on developing physics based models, understanding the effects of various process parameters and developing s ....etc

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Laser micro fabrication technologies on RF MEMS



INTRODUCTION

Radio Frequency Microelectromechanical Systems Switches (RF MEMS)
Lower insertion loss
High isolation
Greater linearity
Lower static power dissipation

RF MEMS Switch Structure

Substrate
Coplanar waveguide(CPW) signal line
Bridge
Electrode plate

Fabrication based on IC wet and dry etching technique

Fabrication Procedure

Oxidation of SiO2 and deposition of SiN on Si substrate
F ....etc

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pulsed laser micro polishing seminar ppt

Abstract
The objective of this work is to predict the final roughness of metal surfaces that have undergone pulsed laser micro polishing. The motivation for pulsed laser micro polishing is to reduce the surface roughness of parts whose surface texture can approach the feature size. Being able to predict the magnitude of the polishing and frequency (wavelength) content of the surface will assist in the design of optimal processing parameters with minimal experiments. Laser pulses are used to create shall ....etc

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Laser Micro-Patterning by Means of Optical Fibers with Micro-grinded Lens End Faces



Introduction

Nano-patterning of polymer surface has found a wide range of applications including biotechnology, where holes in the size of hundreds nm can influence the growth and differentiation of relatively large living cells . Instead of the e-beam patterning technique used in the Ref. 1, we ap-plied direct writing by laser-light. In our previous papers , we have demonstrated that th ....etc

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Chemical Mechanical Planarization (CMP) is an important process in semiconductor chip fabrication. In the CMP process, excess material is removed and the surface is planarized by the action of chemical and mechanical forces. Shallow Trench Isolation (STI) has become a key technology for device isolation in recent times. In this method, a shallow trench is made on the silicon wafer between active devices, silicon dioxide is deposited over the trench as well as the active area and the excess silicon dioxide is removed by CMP. The oxide remaining ....etc

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