Tsunemasa Saiki

Novel Characteristics of Multifunctional Fluid Filters Fabricated by High-Energy Synchrotron Radiation Lithography

A new method using multifunctional fluid filters with through-capillary arrays for high throughput and large-scale integrated microfluidics is proposed. The method utilizes a liquids surface tension and fluid flows perpendicular to a substrate using a fluid filter. Utilizing this method, we can minimize the space consumption of microchannels, and enhance the flexibility of channel design, because these are not extant on the surface of substrates as in traditional microfluidics, but are through-capillary arrays passing through the substrates. In addition, the passive multifunctional characteristics of the fluid filter are favorable for the integration of microfluidics. Therefore, the integration number can be increased from the previous order of hundreds to thousands or more. We conducted a computational fluid dynamics (CFD) analysis to examine the feasibility of vertical fluid flow operation; the multifunctionality of the fluid filter as a microvalve, a microchannel and a micromixer was estimated. The fabrication of the fluid filter by deep X-ray lithography and the vertical fluid flow operation were successfully conducted and the high-throughput properties of the vertical fluid flow were demonstrated.

Evaluation of Teamwork for Simulator Training Based on Heart Rate Variability: Case Study of A Cadet of Ship Navigator

Abstract Mental workload is useful for evaluating a performance of ship navigator- a captain, a duty officer, and a pilot. The heart rate variability (R-R interval), nasal temperature and salivary amylase predict well based on pre-experiments; however, most of research tests a professional skill. The evaluation does not test a cadet yet. Moreover, the teamwork evaluation is not yet also. In this paper, we measure cadets’ R-R interval while they guide a ship from narrow channel to open sea in New York, and evaluate their teamwork based on R-R interval for simulator training. The experiment is carried out using a ship bridge simulator, not a real ship. We show R-R interval is a good index for evaluating the teamwork for simulator training in ship navigation.

Proposal of a Novel Liquid Flow Actuator for Lab-on-chips Operated by Surface Acoustic Wave

In this paper, a novel surface acoustic wave (SAW) continuous liquid flow actuator is described, its fabrication method and the liquid flow characteristics are also discussed.

Ferromagnetic resonance of Ni wires fabricated on ferroelectric LiNbO3 substrate for studying magnetic anisotropy induced by the heterojunction

The electrical ferromagnetic resonance of micro-scale Ni wires with magnetic anisotropy induced by the heterojunction between the Ni layer and ferroelectric single crystalline LiNbO3 substrate was demonstrated by using rectifying effect. The two resonance modes were observed in the Ni wire aligned parallel to the applied magnetic field in plane. The lower resonance frequency mode is considered to correspond to the normal resonance mode with domain resonance, while the higher resonance mode is attributed to the mode which is contributed by the heterojunction between the Ni layer and LiNbO3 substrate. Our results manifest that the rectifying electrical detections are very useful for understating and evaluating the magnetic properties induced by the heterojunction.