Print ISSN: 1681-6900

Online ISSN: 2412-0758

Volume 26, Issue 9

Volume 26, Issue 9, September 2008, Page 335-1157

Predictioin Of Surface Roughness In Turning By Multiple Regression Model

Abbas Fadhel Ibraheem

Engineering and Technology Journal, 2008, Volume 26, Issue 9, Pages 1055-1060

In this research, we propose statistical package for social sciences (SPSS), to
predict surface roughness in turning process. Two independent data sets were
obtained on the basis of measurement: training data set and testing data set.
Original length, diameter and selected length are used as independent input
variables (parameters), while surface roughness as dependent output variable. On
the basis of training data set, different models for surface roughness were
developed by multiple regression model. The multiple regression model by using
(SPSS) could predict the surface roughness (Ra) with average percentage deviation
of 4.6%, or 95.4%, accuracy from training data, and from testing data set that was
not included in the multiple regression analysis with average percentage deviation
of 7.9%, or accuracy of 92.1%.

Improvement of Locally Produced Low- Density Polyethylene

Najat .J.saleh; Zanaib.Y.shnean

Engineering and Technology Journal, 2008, Volume 26, Issue 9, Pages 1061-1067

In the present work, a polymer composite was fabricated by mixing LDPE
with different wt% of pigment (Fe2O3 and TiO2) to obtain desirable properties in
fabrication single screw-extruder was utilized , this mixing machine operated at a
temperature between (150-170)Co.some of mechanical properties, such as tensile,
impact, hardness and bending test were determined at different weight fraction of
composite materials. It was found that the addition of pigment (TiO2 and Fe2O3) to the
LDPE leads to increase the modulus of elasticity, tensile strength, tensile strength at
break, shore hardness on other hand it decreases the % elongation at break, and for the
impact strength.

Study Synergy Effect on Erosion-Corrosion in Oil Pipes

Sami Abulnoun Ajeel; Mohammed Abdullatef Ahmed

Engineering and Technology Journal, 2008, Volume 26, Issue 9, Pages 1068-1080

Steel corrosion and erosion-corrosion have an important role in oil fields
utilizing steel pipelines. Therefore; in the present work corrosion, erosion and
erosion-corrosion tests are studied individually to investigate the interaction
between corrosion and erosion processes and to quantify the synergy (that caused
by erosion) in realistic flow environments.
The experimental work tests were done using special device which was
designed and manufactured according to (G 73) ASTM with certain modifications.
The experimental work tests were achieved using traditional weight loss
technique to measure weight loss rates in (gmd) unit. Also the microstructure
observations of the test specimens are studied.
It was observed that whole tests were conducted on oil pipe (X 60) made of
low carbon steel in plate form, tests were made on corrosion using 3.5 wt %
sodium chloride. (NaCl) solution as sea water purged with CO2 gas as the corrosive
medium in crude oil, erosion using 1 wt % silica sand as the erodent in distilled
water purged with N2 gas as anti corrosive medium to get erosion just during
erosion and erosion-corrosion using the same mentioned medium in the corrosion
but in erosion-corrosion 1 wt % silica sand was added as slurry to that medium, all
tests above were done under pumped media except in case of corrosion and
pumped media had constant pressure of 1 bar, flow rate Q = 36 L/min, temperature
≈ 25 ºC and pH = 4.4 for corrosive and erosive-corrosive media but pH = 7.4 for
erosive medium.
After traditional weight loss technique was achieved, it was found that
corrosion rate C.R (0.18144 gmd) was the smallest, erosion rate E.R (0.80214gmd)
was greater than corrosion rate (C.R), but erosion-corrosion rate EC.R
(3.99161gmd) was the biggest ie. (EC.R was greatest), in addition synergy
(0.0315g) was calculated by using special equation related to weight loss which
was measured in (g) unit.

Design and Simulation of Sigma-Delta Fractional-N Frequency Synthesizer for WiMAX

H. T. Ziboon; H.M. Azawi

Engineering and Technology Journal, 2008, Volume 26, Issue 9, Pages 1081-1096

This paper presents a design and simulation of proposed frequency synthesizer which
can be used for WiMAX. Design parameters for the proposed fractional-N PLL
synthesizer for WiMAX system are either selected from WiMAX standards or
according to results of analysis for each unit of the proposed system. Different
techniques for phase noise reduction are discussed. Sigma-delta fractional-N
technique is chosen for WiMAX system, since low settling time, spurious level and
phase noise can be obtained by using this technique. The simulation result shows the
system is stable, since the phase margin is greater than 45 degree. The settling time,
spurious level and phase noise obtained with this synthesizer are 5.9μs, -90dBc/Hz,
and -100dBc/Hz respectively. CppSim program (C++ simulator language) and Matlab
(V.7) are used for simulation of ΣΔ fractional-N PLL synthesizer.

Developing Flood Discharge Capacity of Kmait River

Mahmoud S. Al Khafaji; Hayder A. Al Thamiry; Riyadh Z. Al Zubaidy

Engineering and Technology Journal, 2008, Volume 26, Issue 9, Pages 1097-1109

Kmait River is a flood escape that was constructed to divert water during
flood season from Tigris River to Al Huwayza Marsh through AsSanna'f Marsh.
Water stored in Al Huwayza Marsh is then discharged to Tigris River, through Al
Kassara River, and to Shatt Al Arab River, through AsSuwayb River.
Kmait River, AsSanna'f Marsh, and Al Huwayza Marsh form one
hydrological system. Therefore, the capacity of AsSanna'f Marsh and the capacity
and operation schedule of Al Huwayza Marsh were taken into consideration when
developing the capacity of Kmait River.
It was found, by using a one dimensional flow simulation model, that the
present discharge capacity of Kmait flood escape does not exceed 80m3/sec, and
this discharge can’t be diverted completely into Al Huwayza Marsh during January
and February months of a wet year unless the discharge capacity of AsSanna'f
Marsh outlet is increased from its current capacity of 402m3/sec to 468m3/sec.
It was found that the contraction in last part of Kmait River is throttling the
discharge. If this part is reshaped, the capacity of Kmait river will increased to
250m3/sec, which could be diverted into Al Huwayza Marsh if AsSanna'f Marsh
outlet reshaped and its capacity increased to 569m3/sec.
Depending on the maximum allowable monthly inflow of Al Huwayza
Marsh incase of replacing its present outlets control structures by new ones with a
capacity of 500m3/sec, Al Huwayza Marsh will absorb floods diverted from Tigris
River at design capacity of the control structure of Kmait River of 400m3/sec after
reshaping the river cross sections and increasing the discharge capacity of
AsSanna'f Marsh outlet to 744m3/sec.

In-nSiC schottky photodiode ; Fabrication and Study

Khalid Z. Yahiya; Ammar H. Jraiz; Abdulla Khudiar Abass

Engineering and Technology Journal, 2008, Volume 26, Issue 9, Pages 1110-1115

In the present work , schottky photodiode have been mode on n-type SiC
by depositing of thin layer of In . electrical characteristics included I-V
(dark and illumination ) have been investigated . Ideality factor is 1.6 and
barrier height is 0.53 eV was calculated from I-V and Isc-Voc
characteristics, Ideality factor is 1.7 and barrier height found to be 0.64 eV,
and from optoelectronic characteristics have found sensitivity results show
that peak response of photodiode was 550nm .

Design Active Filter Based on Genetic Algorithm

Mohamed Abdul-whab; Razi J. Al-Azawi

Engineering and Technology Journal, 2008, Volume 26, Issue 9, Pages 1116-1124

The lossy-FDNR based active filter has an important property among many
design realizations. This includes a significant reduction in component
count particularly in the number of OP-AMP which consumes power.
However the problem of this type is the large component spreads which
affect the filter performance.
In this paper Genetic Algorithm is applied to minimize the component
spread (capacitance and resistance spread). The minimization of these
spreads allow the filter structure to be integrated since the minimum
component spread mean minimum chip area required for fabrication.

The Effect of Magnetic Water on Growth of Chick-Pea Seeds

Samir H. Nasher

Engineering and Technology Journal, 2008, Volume 26, Issue 9, Pages 1125-1130

Magnetized water has been experimented on chick-pea seed growth. Seeds are growing in plastic cups
for 18 days and irrigating with magnetized water which prepared by using static magnetic field. Plants
lengths are taken daily up to the day 18. Length results show that seeds irrigated with magnetized
water were taller than seeds irrigated with tap water. The difference in length was (2.67 cm) between

The Electrical Degradation of Fiberglass Poles

Sami .Ajeel; Mokdad T.Younis; Arkan A.Hussein

Engineering and Technology Journal, 2008, Volume 26, Issue 9, Pages 1131-1142

This work involves fiberglass samples used in two kind of aging (45
days aging, 45 days aging with AC of 25 kV). Five sets of fiberglass
samples were used in the accelerated aging tests and each set consists of
nine fiberglass samples. The tested insulation length of these samples was
chosen as 0.3 m. Two metallic bands, upper and bottom, were used as
electrodes and tightly wrapped on the samples. The effect of surface
condition on the materials electric degradation was studied and the nine
samples were divided into' three group. The external surfaces of the first
group of tested samples were kept intact, but some scratches were manually
placed on the external surfaces of the second group. For the third group, five
holes, each with 2.5 cm in diameter, were manually drilled in each sample.
The electric experimental using to identify the insulation strength of
fiberglass materials were (the lighting impulse test, AC wet flashover tests
and, AC dry flashover test).The result show that the CFO voltage and AC
flashover under dry condition were higher than under wet condition for all
samples. The leakage current has a linear relation ship with applied voltage.
The electric degradation is significant when the sample were tested with
electric stress.


Inmar N. Ghazi

Engineering and Technology Journal, 2008, Volume 26, Issue 9, Pages 1143-1157

In this paper few high speed (i.e. as high as 80 GB/s) all-optical logic gates has been studied.
These logic gates include a ( 80Gb/s XOR ) gate using semiconductor optical amplifier (SOA)
based Mach-Zehnder interferometer incorporated with a delayed interferometer (DI), The
performance of XOR operation has been investigated using numerical simulations. The quality of
the XOR result is improved using a (DI) delayed interferometer after the Mach-Zehnder
interferometer. . A (80Gb/s XNOR) gate using four wave mixing (FWM) in highly nonlinear
fibers (HNLF) have been studied also, the four wave mixing process is a very fast process in
fibers ,the nonlinear Schrödinger equation that describes (FWM) process in fiber is solved
numerically using the split-step Fourier transform method ,this scheme is capable of operating at
a data rate as high as 250Gb/s ,finally A(40Gb/s) NOR gate operation has been analyzed by a
numerical solution of the SOA rate equations. To investigate the quality of NOR operation by
simulation, Q factor of the NOR output signal has been calculated. Q factor gives the information
of the optical signal to noise ratio in digital transmission .All numerical simulation programs
performed through Matt-Lab 7.0 prgram.