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Journal Articles

Combined effect of flux pinning by three-directional columnar defects in a field-angular region of high-$$T_{rm c}$$ superconductors

Sueyoshi, Tetsuro*; Enokihata, Ryusei*; Hidaka, Yuka*; Irie, Masahiro*; Fujiyoshi, Takanori*; Okuno, Yasuki*; Ishikawa, Norito

Physica C, 582, p.1353824_1 - 1353824_5, 2021/03

https://doi.org/10.1016/j.physc.2021.1353824
 Times Cited Count：1 Percentile：7.92(Physics, Applied)

We investigated the combined effect of flux pinning by three-directional columnar defects (CDs) in a wide field-angular range of YBa$$_{2}$$Cu$$_{3}$$Oy thin films, where CDs parallel to the $$c$$-axis and CDs crossing at $$pm$$$$theta$$ ($$theta$$=45$$^{circ}$$, 60$$^{circ}$$ and 80$$^{circ}$$) relative to the c-axis were installed by 200 MeV Xe-ion irradiations. The three-directional CDs with $$theta$$$$leqq$$$$pm$$60$$^{circ}$$ form a field angular curve of critical current density Jc with a broad peak centered at magnetic field (B) parallel to the $$c$$-axis, whereas the Jc shows no peaks around the crossing angles of $$pm$$$$theta$$. When the crossing angle is expanded to $$theta$$=$$pm$$80$$^{circ}$$, a drastic change in the field- angular behavior of Jc is induced: there is not a large enhancement of $$J_{rm c}$$ around B//c. We also demonstrated that the combined configuration consisting of CDs at $$theta$$= 0$$^{circ}$$, $$pm$$45$$^{circ}$$, $$pm$$60$$^{circ}$$ and $$pm$$80$$^{circ}$$ provides a uniform enhancement of $$J_{rm c}$$ over a wide angular-region.

Journal Articles

A Fluorometric skin-interfaced microfluidic device and smartphone imaging module for ${{it in situ}}$ quantitative analysis of sweat chemistry

Sekine, Yurina; Kim, S. B.*; Zhang, Y.*; Bandodkar, A. J.*; Xu, S.*; Choi, J.*; Irie, Masahiro*; Ray, T. R.*; Kohli, P.*; Kozai, Naofumi; et al.

Lab on a Chip, 18(15), p.2178 - 2186, 2018/08

http://doi.org/10.1039/c8lc00530c

The rich composition of solutes and metabolites in sweat and its relative ease of collection upon excretion from skin pores make this class of biofluid an attractive candidate for point of care analysis. Here, we present a complementary approach that exploits fluorometric sensing modalities integrated into a soft, skin-interfaced microfluidic system which, when paired with a simple smartphone-based imaging module, allows for in-situ measurement of important biomarkers in sweat. A network array of microchannels and a collection of microreservoirs pre-filled with fluorescent probes that selectively react with target analytes in sweat (e.g. probes), enable quantitative, rapid analysis. Field studies on human subjects demonstrate the ability to measure the concentrations of chloride, sodium and zinc in sweat, with accuracy that matches that of conventional laboratory techniques.

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