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A plug-based on-chip titration device, constructed with a glass substrate and a poly (dimethylsiloxane) (PDMS) substrate, was used for acid-base titration. The device features a volume-regulation unit to produce plugs of a uniform volume used for titration. Although the volume of plugs formed by only injecting a solution and air simultaneously from a T-junction distributed in a wide range, the plug...
Subclinical mastitis is a common infectious disease of dairy cows. To develop an early diagnostic device for mastitis, we focused our attention to the increase in the number of neutrophils in raw milk of mastitic cows. Since neutrophils secrete superoxide anion (O2−), it can be a good indicator to estimate the number of neutrophils. Neutrophils were separated from fat globules using the difference...
Freshness is an important factor that determines the quality of rice. However, to measure the freshness, the procedures for conventional methods are complicated or the instrument used for the measurement is expensive. If there is a portable device to measure the freshness of rice easily at home, it will be of great help for consumers. In this study, we have developed an electrochemical microdevice...
N induced scattering in GaAs1-xNx films are quantitatively investigated, and reduction of the scattering is demonstrated. The hole mobility of GaAsN films is separated to individual scattering processes by parameter fitting. The mobility limited by the N induced scattering is fitted by the function of ??N = KNT-(0.6??0.2). The amount of N induced scattering center increases linearly with increasing...
The epitaxial growth of Mg-doped C60 films has been investigated. It is found that the epitaxial growth of Mg-doped C60 film is enabled by using mica (001) substrate in the low Mg concentration region (Mg/C60 molar ratio < 1). The crystal quality of the epitaxial Mg-doped C60 film is improved drastically in compared with micro-crystalline film on glass substrate. Such drastic improvement of crystal...
A microfluidic device that works autonomously without external electrical signals was fabricated. The device consisted of chemically actuated microinjectors and microfluidic networks. The operation of the microinjectors was based on the volume change of oxygen bubbles produced as a result of catalytic decomposition of hydrogen peroxide. A hydrogen peroxide solution was transported through a flow channel...
Electrochemical biosensing has been generally considered to be highly efficient. However three-dimensional numerical analysis has revealed that only a fraction of an analyte is consumed for amperometric detection in a flowing stream. To improve the collection efficiency and the sensitivity of detection, micropillar electrodes were fabricated. Furthermore, a gold black layer was formed on the surface...
The reduction of residual acceptors in GaAsN films and the improvement of GaAsN crystal quality evidenced by hole mobility and PL intensity were reported. Si doping using a SiH4 gas was also studied. Based on these results GaAsN homo-junction solar cells were fabricated by CBE at the first time. The short circuit current, open circuit voltage, fill factor and conversion efficiency of the GaAsN solar...
We investigated uni-axial tensile stress dependence of AC losses (transport current, magnetization and total losses) in HTS coated conductor with magnetic Ni-alloy substrate. The AC loss characteristics are studied by relating to tensile stress dependence of critical currents of the conductor. Experimental results showed that the loss characteristics were different whether the critical current recovered...
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