Design of an electrochemical micromachining machine

Electrochemical micromachining (μECM) is a non-conventional machining process based on the phenomenon of electrolysis. μECM became an attractive area of research due to the fact that this process does not create any defective layer after machining and that there is a growing demand for better surface integrity on different micro applications including microfluidics systems, stress-free drilled holes in automotive and aerospace manufacturing with complex shapes, etc. This work presents the design of a next generation μECM machine for the automotive, aerospace, medical and metrology sectors. It has three axes of motion (X, Y, Z) and a spindle allowing the tool-electrode to rotate during machining. The linear slides for each axis use air bearings with linear DC brushless motors and 2-nm resolution encoders for ultra precise motion. The control system is based on the Power PMAC motion controller from Delta Tau. The electrolyte tank is located at the rear of the machine and allows the electrolyte to be changed quickly. This machine features two process control algorithms: fuzzy logic control and adaptive feed rate. A self-developed pulse generator has been mounted and interfaced with the machine and a wire ECM grinding device has been added. The pulse generator has the possibility to reverse the pulse polarity for on-line tool fabrication.The research reported in this paper is supported by the European Commission within the project “Minimizing Defects in Micro-Manufacturing Applications (MIDEMMA)” (FP7-2011-NMPICT- FoF-285614)

Adaptive UKF based state estimation of HIV, Hepatitis-B and cancer mathematical models

Nowadays, mathematical model based estimation and control approaches are frequently consulted and applied for the treatment of such diseases. For the derived dynamics of the diseases, there are some states or internal variables which are very difficult to measure and needs very expensive measurement devices. Therefore, in this paper, adaptive unscented Kalman filter (AUKF) is designed for the state estimation of some vital diseases. These are Human Immunodeficiency Virus (HIV), Hepatitis-B virus (HBV) infection and Cancer such that unmeasurable states are estimated under measurement noises. The computational results show that accurate estimation of the unmeasured states are obtained and plotted for monitoring and control of possible future real-time applications. © 2018 IEEE

Adaptive PI and SMC for control of uncertain and varying time-delay chaotic coronary artery vessel

In this paper, a fuzzy tuning based proportional-integral (PI) and sliding mode (SM) controllers are designed for the synchronization based control of chaotic coronary artery system. The coronary artery system is assumed to be disturbed by an uncertainty function that simulates an unhealthy condition. The synchronization of this unhealthy coronary artery to the healthy coronary artery is achieved by the designed controllers that provide a proper blood feeding to the heart. In fact, PI and SMC are feedback controllers to track a healthy coronary artery system trajectory as in model-reference control. First, PI and SM controller parameters are determined by a trial-and-error approach, however in second case, fuzzy system tuned parameters are also designed to get accurate synchronization based control results. The proposed and designed controllers are applied to improve synchronization performance of coronary artery system. In experiments, the performance of controllers is illustrated and rootmean squared errors (RMSE) are given in Table for a comparison. The numerical applications show better synchronization results and control performances compared to the literature works and fixed parameter cases. © 2018 IEEE

DETERMINATION OF HYDROLYTIC ENZYME CAPABILITIES OF HALOPHILIC ARCHAEA ISOLATED FROM HIDES AND SKINS AND THEIR PHENOTYPIC AND PHYLOGENETIC IDENTIFICATION

WOS: 000348973000002This research aims to isolate extremely halophilic archaea from salted hides, to determine the capacities of their hydrolytic enzymes, and to identify them by using phenotypic and molecular methods. Domestic and imported salted hide and skin samples obtained from eight different sources were used as the research material. 186 extremely halophilic microorganisms were isolated from salted raw hides and skins. Some biochemical, antibiotic sensitivity, pH, NaCl, temperature tolerance and quantitative and qualitative hydrolytic enzyme tests were performed on these isolates. In our study, taking into account the phenotypic findings of the research, 34 of 186 isolates were selected. These isolates were identified by 16S rRNA sequence analysis and 15 different strains of extreme halophilic archaea were identified. 13 strains of these were identified for first time from salted raw hide and skin in our study including Natrialba aegyptia, Halococcus thailandensis, Halococcus dombrowskii, Halovivax asiaticus, Halovivax sp. E107, Haloarchaeon, Natronococcus sp., Halorubrum sp., Halomicrobium zhouii, Natronococcus jeotgali, Halo terrigena thermotolerans, Natrinema versiforme, Halobacterium noricense. At the same time detecting Natrialba aegyptia in 6 of 8 hide samples showed that this strain is widely found in hide and skin samples. Research results are expected to contribute to other studies and solving microbial problems in leather industry.Scientific Research Project of canakkale Onsekiz Mart UniversityCanakkale Onsekiz Mart University [2010/23]This work was supported by Scientific Research Project of canakkale Onsekiz Mart University (project no. 2010/23). We are thankful to Assoc. Prof. Ali Nail YAPICI, Department of Textile, Apparel, Footwear and Leather in canakkale Vocational School of Technical Sciences and Dr. Mustafa KOLUKIRIK for scientific contributions