Equivalent Electronic Circuits Computer Generated from Alternating-Current Impedance Data

2009 ◽  
pp. 5-5-12
Author(s):  
EL Pye ◽  
K Golestaneh
Keyword(s):  
Alternating Current ◽  
Electronic Circuits ◽  
Impedance Data

scholarly journals Kendali Kecepatan Motor DC Menggunakan Chopper DC Dua Kuadran Berbasis Kontroller PI

2020 ◽  
Vol 1 (2) ◽  
pp. 241-245
Author(s):  
Febri Rahmadi ◽  
Muldi Yuhendri
Keyword(s):  
Direct Current ◽  
Rotation Speed ◽  
Speed Control ◽  
Alternating Current ◽  
Dc Motor ◽  
System Control ◽  
Electronic Circuits ◽  
Feedback Parameter ◽  
Proportional Integral ◽  
Set Up

DC (Direct Current) motor  is one of drive which is widely used in industry. DC motor as a drive has several advantages compared with AC (Alternating Current) motor. One of the advantages use DC motor as drive in industry because has a starting big torque and rotation speed motor can be set up easily in the range wide variation of rotation. One of speed setting DC motor can use DC Chopper two quadrant. Speed control DC motor with DC Chopper two quadrant is a method for speed control motor DC can operate for two condition which can be stated in the quadrant system. For one quadrant DC motor can operate for forward motoring and the second quadrant DC motor can operate for renegerative breaking. DC Chopper is a electronic circuits can change value voltage and current DC source, and can using for speed control and operate DC motor. For system control used controller PI (proportional integral) for feedback parameter mechanics and electrick DC motor. For controller PI can work for system control used Simulink software for programming, and also works for interfece to displays real times condition parameters work operate DC motor.

Experimental Studies of Alternating and Direct Current Impedance Properties of Ag/AgCl Electrodes

2015 ◽  
Vol 778 ◽  
pp. 110-115
Author(s):  
Wei Liu ◽  
Wei Zhou ◽  
Ming Gang Li ◽  
Qing Fu Qiu ◽  
Rui Liang Liu ◽  
...  
Keyword(s):  
Direct Current ◽  
Electrical Potential ◽  
Experimental Studies ◽  
Alternating Current ◽  
Ac Impedance ◽  
Electrode Pair ◽  
Impedance Data ◽  
Biomedical Measurement ◽  
Long Time ◽  
Clinical Detection

Ag/AgCl electrodes as an important sensor are used in modern clinical detection and biomedical measurement, which have been widely applied in electrocardiograph (ECG), electroencephalogram (EEG), electromyography (EMG), electricity impedance technology (EIT) and so on. In this study, the electrode pairs were gel-to-gel connected. After a stimulating current, the alternating current (AC) or the direct current (DC), was injected through the electrode pair, the electrical potential was recorded, then impedance data of Ag/AgCl electrode was obtained. The results showed that the AC impedance of electrode increased, and then gradually decreased with the increase of current size. It was found that the DC impedance data of Ag/AgCl electrode was changed greatly after the electrode pair was injected into the alternating current. With the long time continuous measurement, the AC impedance of electrode pair gradually increased within the 12 hours. However, the significant fluctuations of AC impedance were observed after 12 hours. Comparing with the AC impedance, the DC impedance of electrode pair exhibited a great increase with the increase of measurement time.

Interactions Between Al and Cr Thin Films

1976 ◽  
Vol 34 ◽  
pp. 638-639
Author(s):  
R. M. Anderson ◽  
T. M. Reith ◽  
M. J. Sullivan ◽  
E. K. Brandis
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Vacuum System ◽  
Processing Temperature ◽  
Diffusion Couples ◽  
Electronic Circuits ◽  
Intermetallic Formation ◽  
Si Substrates ◽  
Aluminum Silicon

Thin films of aluminum or aluminum-silicon can be used in conjunction with thin films of chromium in integrated electronic circuits. For some applications, these films exhibit undesirable reactions; in particular, intermetallic formation below 500 C must be inhibited or prevented. The Al films, being the principal current carriers in interconnective metal applications, are usually much thicker than the Cr; so one might expect Al-rich intermetallics to form when the processing temperature goes out of control. Unfortunately, the JCPDS and the literature do not contain enough data on the Al-rich phases CrAl7 and Cr2Al11, and the determination of these data was a secondary aim of this work.To define a matrix of Cr-Al diffusion couples, Cr-Al films were deposited with two sets of variables: Al or Al-Si, and broken vacuum or single pumpdown. All films were deposited on 2-1/4-inch thermally oxidized Si substrates. A 500-Å layer of Cr was deposited at 120 Å/min on substrates at room temperature, in a vacuum system that had been pumped to 2 x 10-6 Torr. Then, with or without vacuum break, a 1000-Å layer of Al or Al-Si was deposited at 35 Å/s, with the substrates still at room temperature.

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