Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : anti


Polyamide Nanofibers Coating by Electrospinning Technique for Anti Corrosion Behavior

B.M. Aldabbagh; H.J. Alshimary

Engineering and Technology Journal, 2017, Volume 35, Issue 10, Pages 987-991

Poly amide (PA-6) nanofiber coatings on aluminum surface using electrospinning technique under two different voltage (24 kV & 34 Kv) were prepared. The coating morphology , roughness and 3D structural properties tested by using Atomic force microscopes (AFM), surface characterized by (SEM) microscopy, and high resolution optical microscopy (HROM) , Contact angle for hydrophobic behavior was tested by shape drop analyzer , and FTIR analysis for changing in crystalline structure was performed .The AFM images showed that the PA coating on the aluminum surface have a tight and twisted nanofiber structure with some beads through its morphology. SEM images shows the morphology beads of surface nanofibers . The electrochemical corrosion of aluminum without and with PA coating studied by subjected it to aerobic solutions of 3.5 wt.% sodium chloride (NaCl) . It has been found that the PA coatings decrease the corrosion currents and corrosion rate as well as increase the corrosion resistance for aluminum in the NaCl solution .

Design and Simulation of A New Proposed Single-Slope Integrating Analog-to- Digital Converter System Based on Non-Linear Amplifiers

Azzad B. Saeed

Engineering and Technology Journal, 2010, Volume 28, Issue 6, Pages 1241-1252

In this paper, a unipolar single-slope integrating analog-to-digital
converter(ADC) is discussed, designed, and simulated, whereas, its conversion
time is less than that of the dual-slope integrating ADC.The proposed system
consists of logarithmic amplifier,anti-logarithmic amplifier, integrator, counter,
control logic unit and two timers stages.
The proposed design characterizes some of significant properties which
make it distinguished from the other previous designed systems, such as, it has
good noise immunity because of passing of the analog input signal through the
integrator circuit which it considered as a low pass filter. This system is capable
to convert an analog voltage of range of (0.0 – 0.6) volt using non-linear
amplifiers. At last, this system has very good forward linearity relation between the
output digital number and the analog input voltage value which is realized later by
theoretical calculation and simulation results.
This system is simulated and tested using software package Electronic
Workbench version V9, and one can see that simulation results approach to the
theoretical results, so for this reason, this system possesses acceptable design and
performance.