Print ISSN: 1681-6900

Online ISSN: 2412-0758

Volume 26, Issue 4

Volume 26, Issue 4, April 2008, Page 143-495


Electrochemical Studies of Heat Treated Ti-6Al-7Nb alloy used in Surgical Implant Application

Sami Abulunoun Ajeel

Engineering and Technology Journal, 2008, Volume 26, Issue 4, Pages 394-407

biocompatibility. Vanadium-free Ti-6Al-7Nb alloy has been developed as a
potential alloy for providing improved corrosion and wear resistance for orthopedic
implant devices, and to avoid the toxicity of vanadium ion.
This work deals with the dependence of corrosion parameter of Ti-6Al-7Nb
alloy on compositional variation in the phases resulting from various heat treatments.
Electrochemical examinations were applied made in blood plasma solution involving
potential –time and dynamic polarizations for Ti-6Al-7Nb alloy of various heat
treatments.
The corrosion parameters obtained from open circuit potential, and
potentiodynamic polarization for the alloy Ti-6Al-7Nb were superior for specimen
developed by solution treatment at 950oC and air cooled followed by aging in
comparison with that of other treatments.

Hydrochemical study of Rain Water In Baghdad city-Iraq

Jaafar Sadeq Maatooq; Aqeel Shakir Al-Adili

Engineering and Technology Journal, 2008, Volume 26, Issue 4, Pages 408-422

The chemical substance dissolved in rain water are generally considered to have two atmospheric
sources, dry fallout and/or soluble salts. The present study deals with the rain water year 1995-1996 at
Baghdad city were expressed in term of monthly averages of the collected samples . The concentrations
values of cations (Ca, Mg, K and Na) and anions (Cl, SO4 and HCO3),were expressed as average
annual. All ions concentration, are found to be within the excepted range of fresh water. These results
were compared with rain water year 1985-1986. Appreciable reduction in concentrations of both cations
and anions have been recorded, and the percentages of reduction are ranging between 28% to 84%.
Moreover, by adopting fractionation factor, the results revealed that the sea water have less contribution
of all ions concentration than other sources (local activities). The results of the chemical analysis were
dealt with statistically by using cluster and factor analysis .

Enhanced the response time of the P-N junction Photodetector

Khawla S. khashan; Evan T. Salem; Mukaram A. Fakhery

Engineering and Technology Journal, 2008, Volume 26, Issue 4, Pages 423-428

In the present work, the response time of p-n junction photo-detector has been achieved by using the rapid thermal
annealing (RTA) technique in which the annealing time has been ranged from (5-25) s at (773 K) the result shows a good
improvement in the time constant of the detector and it has beast result at (15) s which reach to (26.81) ns for (905) nm
wavelength of GaAlAs laser

Study of Thermal Characteristics of a Composite Specimen Experimentally and by Using Finite Element Method

Jawad Kadhim Uleiwi; Sura Salim

Engineering and Technology Journal, 2008, Volume 26, Issue 4, Pages 429-441

This research deals with the study of the effect of fibers volume
fraction and fibers orientation on the thermal conductivity and wall surface
temperatures for composite specimen in form of Lee’s disk by using
experimental work and finite element technique. The results show that
the thermal conductivity increases with increasing fiber volume fraction of
the composite specimen, and in the longitudinal direction is larger than in
the lateral fiber direction.The experimental results indicated that the largest
value of the thermal conductivity for the composite specimen was (0.611
W/m.°c) at (Vf = 40 %) in the longitudinal direction, while the lowest value
was (0.195 W/m.°c) at (Vf = 10 %) in the lateral direction. Also the results
show that the maximum difference for the thermal conductivity between the
experimental work and finite element method was ( 7 % ) at ( Vf = 10 % )
in the lateral direction while the minimum value was ( 3.5 % ) at ( Vf = 40
% ) in the longitudinal direction.

Optoelectronic properties of ZnO/PS/n-Si Heterojunctions

Khawla S. Khashan

Engineering and Technology Journal, 2008, Volume 26, Issue 4, Pages 442-448

In this work a colloid of nanocrystalline ZnO particles is prepared by
chemical method, and then sprayed on porous silicon substrate which is prepared
by electrochemical etching under a current density of 15mA/cm2 for 10 min. The
initial radius of the ZnO particles is found to be (2.2 nm). FTIR spectra exhibit the
presence of Zn – O bond which indicates the formation of ZnO particles. Also
spectra reveals the formation of SiHx (x=1-2) and Si-O bond which indicates the
presence of porous layer. High performance rectifying was obtained, with high
photoresponsivety of 0.54 A/W at 400 nm. The corresponding quantum efficiency
was 166.7%.The results show that ZnO on porous silicon (PS) structures will act as
good candidates for making highly efficient photodiodes.

Study the Adhesion Force of Tubular Shaped Fiber Reinforced Composites

Adnan A. AbdulRazak; Najat j. Saleh; Hussein Ali Hamid AL-Abdly

Engineering and Technology Journal, 2008, Volume 26, Issue 4, Pages 449-457

In the present work tubular –shaped fiber reinforced composites were
manufactured by using two types of resin epoxy (EP) and unsaturated polyester
(UP),each was separately reinforced with glass, carbon and kevlar-49 fibers (filament
and woven roving), hybrid reinforcement composites of these fibers were also
prepared. The adhesion force test of the prepared specimens was carried out. These
adhesion forces exhibited a peak value at a percent of hardener/resin (H/R)= 3% for
UP matrix with all type of fiber arrangements while 30% was obtained for EP matrix
.Such behavior was declined with increase in temperatures. Glass transition
temperatures were determined from these measurements, and found to be 90°C for EP–
glass and 83 °C for UP –glass composites.

Effect of Magnetic field on the growth of Escherichia coli and Staphylococcus aureus

Samir.H.Nasher; Amal.A.Hussein

Engineering and Technology Journal, 2008, Volume 26, Issue 4, Pages 458-461

Magnetic fields with two densities (1200 , 3200)gauss experminted on two
kinds of bacteria Escherichia coli and Staphylococcus aureus in Nutrient broth
media . The field subjected for (1,2,3) weeks, and the growth monitored using
optical density (OD) method.
The results shows greatest effects of 3200 gauss than 1200 gauss on bacteria
growth comparing with control sample after third week. The OD resulte of bacteria
Escherichia coli (0.3) with 3200 gauss and (6) with 1200 gauss comparing with
control sample(175.4) and bacteria Staphylococcus aureus (1) with 3200 gauss,
and (10) with 1200 gauss comparing with control sample (174.4).

Sulfur Dioxide Removal in Coal Slurry Reactor

Neran K. Ibrahim; Zainab A. Jawad

Engineering and Technology Journal, 2008, Volume 26, Issue 4, Pages 462-477

The objective of this work was to study the feasibility of using coal
slurry for the removal of SO2 from simulated flue gas stream (air,
SO2). The effect of gas rate, temperature, and initial SO2
concentration on the overall removal efficiency was investigated at
wet and dry bed conditions. The results indicated that the optimum
gas rate was 60 l /min. The SO2 removal efficiency was highly
temperature sensitive, and increases with increasing the bed
temperature especially at wet bed conditions and decreases with
increasing SO2 initial concentration. A mathematical model for the
desulfurization process was proposed based on the material balance
for gaseous and solid phase streams. The model was found to give a
very good description of the experimental data with 95% confidence
level.

EFFECT OF IRRADIATION ON COMPRESSIVE STRENGTH OF EPOXY REINFORCED WITH GLASS FIBERS

Sheelan R. Areef

Engineering and Technology Journal, 2008, Volume 26, Issue 4, Pages 478-483

The compressive strength was investigated for epoxy resin type (DGEBA) before and after
reinforcing with glass fibers (woven roven, chopped strand mat, and two types together as a
sandwich composite), with different volume fractions was prepared. The samples have been
irradiation with γ-ray with a Co60 source for (1055 hrs) with irradiation dose (0-156) KGray at
room temperature (20±2Co).The compressive strength calculated for all samples after
irradiation. The results showed that the compressive strength of epoxy samples increased after
reinforcing with glass fibers, and increased with increasing of volume fractions while the
compressive strength was decreased for all samples after irradiated with γ-ray.

CONTRIBUTION OF LIQUID ASPHALT IN SHEAR STRENGTH AND REBOUND CONSOLIDATION BEHAVIOUR OF GYPSEOUS SOIL

SAAD I. SARSAM; SALAH W. IBRAHIM

Engineering and Technology Journal, 2008, Volume 26, Issue 4, Pages 484-495

Abstract
This paper deals with the effect of stabilizing gypseous soil using two liquid Asphalt
types (cutback and emulsion) on its behavior in shear strength and rebound
consolidation.
Soil-Asphalt specimens had been constructed using various percentages of both liquid
Asphalt types. One group of such specimens were tested in the direct shear box
apparatus to determine the effect of liquid Asphalt on shear strength, cohesion and
angle of internal friction using the unconsolidated un drained test.
Another group of the specimens were subjected to one dimensional confined
compression test using both dry and saturated testing conditions in the consolidation
apparatus.
The effect of liquid Asphalt on the behavior of mixes in consolidation and rebound
consolidation was studied.
It was concluded that gypseous soil is usually stiff in the dry condition, but it is weak
and had a collapsible behavior when saturated. The addition of liquid Asphalt provides
cohesion strength to the soil mass and also acts as a waterproof agent. It creates a type
of elastic properties and reduces the total strain.