R202, Astronomy-Mathematics Building, NTU
Organizers:
I-Liang Chern (Institute of Applied Mathematical Sciences, National Taiwan University)
Invited Speakers: Kam Chuen Ng (Kodak Research Lab.)
Title: Capacitive Touch Sensor Design: A Modeling Approach
Abstract:
Capacitive sensors have been used in touch screen phone or touch screen computers. In this talk, we will describe a mathematical model of simulating a finger approaching a capacitive sensor. The simulating results have been shown to be consistent with experiments. The model includes electrode conductors and floating conductors in which potentials or the sum of the charges is specified. Boundary element or method of moments is used to compute the charges on the sensor in the presence of finger. We will focus on the mathematical and the numerical issues arising from the model.
Title: Ink Wetting and Transfer in Flexographic Printing
Abstract:
Understanding the ink wetting and transfer in flexographic printing will help to improve print quality. Ink wetting on the flexographic plate or the substrate and the amount of ink transfer to the plate and to the substrate will affect the final print quality. We will use the lubrication equation to study the ink wetting on flat or structured surface. We shall use precursor thin film model of Schwartz to study wetting and dewetting of ink on heterogenous surface. A symmetric liquid bridge model is used to study the liquid transfer between parallel plates. The contact line movement on the plates is modeled by the dynamic contact angles of Dussan. We will also discuss the effects of viscosity, surface tension, contact angles and printing speed.
Schwartz, L. W., Hysteretic effects in droplet mohons on heterogeneous substrates: Direct numerical simulation, Langmuir, 14: (12) 3440-3453, 1998.
Dussan, E. B., Ann, Rev. Fluid Mech, 1979. 11: 371-400
Contact: Peggy Lee,peggylee@ncts.ntu.edu.tw, 02-3366-8815
