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Melih Cakmakci,Nurcan Gecer Ulu,Erva Ulu 제어·로봇·시스템학회 2016 International Journal of Control, Automation, and Vol.14 No.1
Increasing demand for micro/nano-technology related equipment resulted in growing interest for precisionpositioning systems. In this paper a modular controller combining cross-coupled control and iterative learningcontrol approaches to improve contour and tracking accuracy at the same time is presented. Instead of using thestandard error estimation technique, a computationally efficient and modular contour error estimation techniqueis used. The new controller is more suitable for tracking arbitrary nonlinear contours and easier to implement tomulti-axis systems. Stability and convergence analysis for the proposed controller is presented with the necessaryconditions. Effectiveness of the control design is verified with simulations and experiments on a two-axis positioningsystem. The resulting positioning system achieves nanometer level contouring and tracking performance.
Antioxidant Capacity and Chemical Properties of Selected Barberry (Berberis vulgaris L.) Fruits
Mustafa Ozgen,Onur Saracoglu,Esma Nur Gecer 한국원예학회 2012 Horticulture, Environment, and Biotechnology Vol.53 No.6
Six purple-black barberry accessions (Berberis vulgaris L.) were obtained from various sites in Sivas province of Turkey. Fruits were analyzed for their total phenolic (TP), total monomeric anthocyanin (TMA) contents and for their antioxidant capacity by the ferric reducing antioxidant power (FRAP) and TEAC assays. Sugar and organic acid composition were also determined by HPLC. TP and TMA contents were measured using the Folin-Ciocalteu reagent and pH differential methods, respectively. Variability between the accessions was not high. Variability among accessions was greatest for FRAP content (C.V. 17.9%); individuals ranged from 41.0 to 65.6 µmol TE・g-1on a fresh weight basis. Variation among the accessions was also evident for TP, TMA, and TEAC values (C.V. 16.21%, 14.85%, and 7.13%, respectively). The major sugars of barberry fruits were glucose (8.84 g・100 mL-1) and fructose (6.12 g・100 mL-1) and dominant organic acids were malic (7.59 g・100 mL-1) and citric (1.34 g・100 mL-1). Within this limited study of six different accessions, chemical profile and antioxidant capacity of barberry fruits have rich source of natural antioxidant substances.