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A miniature and low-cost glucose measurement system

Adams S. D., Buber E., Bicak T. C., Yagci Y., Toppare L., Kaynak A., Kouzani A. Z.

Biocybernetics and Biomedical Engineering

2018

Vol. 38, no. 4

841--849

One of the bottlenecks in widespread adoption of biosensors is the large and sophisticated bioanalytical system that is required to perform signal transduction and analysis. A miniaturized bioanalytical system facilitates biosensing techniques that are portable, easy to handle and inexpensive for fast and reliable measurements of biochemical species. Thus, downscaling the bioanalytical system has become a highly active research area, significantly assisted by recent advances in the microelectronics technology. In this work, a miniaturized system is designed and implemented for amperometric detection, and subsequently tested with a glucose biosensor based on the one-step approach utilizing water soluble poly(oaminophenol). Several experiments are conducted to assess the viability of this system including calibration, interference and application tests. The results are compared with the previously published work performed using the same biosensor tested with a commercial potentiostat in order to verify the applicability of the designed system.

In the jewelry, brazing and laser welding with parameter optimization

Kallek M., Ataoglu S., Yagci Y., Bozkurt H. N., Gulluoglu A. N.

Archives of Metallurgy and Materials

2012

Vol. 57, iss. 2

525-536

In this study, brazing and laser welding were experimentally compared for 9, 14 and 18 carat gold alloys in different color. The gold alloys were joined by laser welding and brazing and the microstructure, hardness, chemical composition, color of the weld joints were investigated. According to study, in laser welding, voltage, pulse duration, pulse diameter and frequency are the most important welding parameters that influence the quality of joints. Welded joints are characterized using three geometric parameters: penetration depth, width of heat affected zone and underfill defects. Finally, optimum laser welding parameters of different color of 9, 14 and 18 carat gold alloys were determined. It is observed that laser welding has numerous advantages compared to the other joining techniques used in the jewelry industry.

W pracy, porównano eksperymentalnie lutowanie i spawanie laserowe 9, 14 i 18 karatowych stopów złota o różnym kolorze. Zbadano mikrostrukturę, twardość, skład chemiczny i kolor połączeń. Wyniki badań spawania laserowego wskazują, że napięcie, czas trwania impulsu, średnica impulsu i częstotliwość to najważniejsze parametry, które wpływają na jakość połączeń. Spawane połączenia opisać można przy użyciu trzech geometrycznych parametrów: głębokość penetracji, szerokość strefy wpływu ciepła i defektów wypełnienia. Ustalono optymalne parametry spawania laserowego 9, 14 i 18 karatowych stopów złota o różnym kolorze. Stwierdzono, że spawanie laserowe ma wiele zalet w porównaniu do innych technik łączenia stosowanych w przemyśle jubilerskim.