In rolling mill, the accuracy and quality of the strip exit thickness are very important factors. To realize high accuracy in the strip exit thickness, the Automatic Gauge Control (AGC) system is used. Because of roll eccentricity in backup rolls, the exit thickness deviates periodically. In this paper, we design PI controller in outer loop for the strip exit thickness while PD controller is used in inner loop for the work roll actuator position. Also, in order to reduce the periodic thickness deviation, we propose roll eccentricity compensation by using Fuzzy Neural Network with online tuning. Simulink model for the overall system has been implemented using MAT-LAB/SIMULINK software. The simulation results show the effectiveness of the proposed control.
Organic thin-film transistors (OTFTs) incorporating blends of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61-butyric acid methyl ester (PCBM) as an active layer were fabricated, and the photoresponse and memory effects of the P3HT/PCBM-TFTs were investigated. With top source–drain contact, the device exhibited a unipolar property with p-channel characteristics in dark condition. Upon illumination, a significant increase in the drain current was observed, and the transfer curve was shifted in the positive direction with ΔV
th = 15.5 V. Moreover, the drain current increased gradually with the response time of light illumination, while it decreased gradually with delay time after turning off the light illumination. The memory effects of the P3HT/PCBM-TFTs were attributed to the slow relaxation of photoinduced charge carriers and the electron trapping–detrapping mechanism. The memory functions of program and erase can be performed using a combination of the optical response and gate voltages.
Zinc Oxide (ZnO) thin films have been deposited onto an ITO glass by RF sputtering method in a controlled condition followed by a layer of Poly(triarylamine) as an electron acceptor to form a hybrid-heterojunction thin film. In this work, Poly(triarylamine) is deposited by using spin coating method at different spin rate ranging from 1000 RPM to 5000 RPM. The correlation between the structural and optical properties of this hybrid heterojunction were investigated. The crystallographic structure of ZnO and PTAA is analysed by obtaining its Full width half maximum and grain size value by using X-ray diffractometer. UV-Vis result strongly reveal that all the thin films exhibits high transparency (>80%) in visible region with wide band gap of 3.38 eV for ZnO and 3.1 eV for PTAA at 5000 RPM sintering. Surface morphology of the hybrid film is observed using an advance material microscope (HIROX) with 3 different lenses of low range, mid-range and high range. It is shown that, as the RPM speed is increasing the distribution of PTAA on the ZnO layer is smoother and uniform. The correlation value obtained for grain size and band gap is 0.9344 and 0.9136. Thus, concluded that grain size and bandgap of device is highly correlated.
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