Engineering and Technology Journal

A Pico cell is a small, low-cost, fast coverage and extra capacity which can be
used wherever the signal drops. The low cost of these cells and the easy
installation as compared with BTSs is very important feature, one more feature is
that Pico cells are more effective in dense phone usage areas and at the extremely
high buildings, also as its radiation power is much less than BTSs so it has no
health effects on human.
This paper makes a design to support the network by using the technique of Pico
cells in order to improve the signal quality inside dense phone usage areas and take
multiple scenarios to show the importance of using such type of cells. The results
show the advantages of using this cell to improve the signal quality especially in
dense phone usage areas

Route optimization is searching problem to find the shortest path from starting to
end point within certain criteria. In this paper, a digital circuit design implementation
was presented according to the Dijkstra algorithms and with new digital technology.
The proposed circuit is built using VHDL and simulated using Xilinx ISE 9.2i
package. The test of the implemented circuit was made by use a 25 point network map
to select the shortest path between any two specific points (from point 3 to point 24).
Simulation behavioral model results show that proposed circuit satisfies the specified
operational requirements. The result appears this requirement with a short time
(depend on the clock frequency used 50MHz). Furthermore, this circuit is flexible to
increase the number of point in the map network.

A three dimensional numerical simulation of fluid flow in a manifold-laterals
system was carried out; several geometrical changes were made to study the effect on
water flowing inside the manifold. The manifold hydraulic diameter and the length
were kept constant in the study. The geometrical changes include the distance between
laterals, the length of the laterals, and the laterals size. It is found that for Reynolds
Number (100 and 1000), increasing the length of the laterals gives uniform flow profile
at laterals outlet. Also reducing lateral size will create a similar effect. A good
agreement was found between the present and FLUENT6.2 results for mass flow rate
from laterals

In many real life problems, one is usually confronted with several objectives,
which are in mutual conflict. In this paper, multi-objective decision making is
obtained, based on a mathematical model by interpolating multi-objective functions
with weights functions coefficients, instead of constant coefficients. Some theories
and computational results are presented to point out the efficiency of our model
and the implemented approach

Dynamic scheduling problem has been an attractive area for researches to
investigate since a long time. Many techniques have been used to tackle such
problems, but all of these techniques require high efforts to formulate the dynamic
scheduling problems inorder to obtain optimal solution. Using Heuristic or
dispatching rules to solve the dynamic scheduling problem is efficient and popular
manner to reach an acceptable level of scheduling. In this paper hybrid techniques
are used in the proposed developed model. First the switching of four dispatching
rules (Earliest Due Date (EDD), Slack Time (SLACK), Slack / Remaining
Operations (S/ROP) and Priority Index) with the aim of choosing minimum tardy
jobs. Second, scheduling-rescheduling approach is used to tackle the dynamic
environment of job-shop problem depending on three level algorithms. Third,
proposing three level algorithms, these levels are resource level, process planning
level to improve scheduling with the aim of minimizing tardy jobs and shorten
"order-to-delivery", and job level to design rescheduling policy depending on
identified factors of each job order. The developed model is applied to real data
from the Heavy Engineering Equipment State Company/Baghdad, and
considerable advantages are observed. Applying the proposed model lead to zero
number of tardy jobs (NT) and zero mean tardiness (MT). It is obvious from the
obtained results that by adopting such model, a better solution for job orders' due
dates can be achieved; hence "order-to-delivery" time can be shortened

Manufacturing industries are rapidly changing from production of scale to production
of scope characterized by short product life cycles and increased product varieties. This
implies a need to improve the efficiency of job shops while still maintaining their
flexibility. These objectives are achieved by Flexible manufacturing systems (FMS). The
basic aim of FMS is to bring together the productivity of flow lines and the flexibility of
job shops, this duality of objectives makes the management of FMS complex. In this
research, the loading problem in FMS, which is viewed as selecting a subset of jobs from
the job pool and allocating them among available machines, is considered. The research
investigates the number of machine loading approaches, which aim to meet the delivery
dates of production orders, and at the same time reduce the manufacturing cost

This paper reports the results of an investigation into the strength of fiber
reinforced high-performance concrete (FRHPC)based on push-off tests. Both
experimental and analytical studies were performed. In the experimental study,
eight FRHPC push-off specimens were tested. Two types of fibers, straight and
hooked-end, in conjunction with percentage of volume fraction of steel
fibers,0.5%, 1.0%, 1.5% and 2.0% were used. In the analytical study, a new
proposed expression was derived based on experimental data in this research and
available data from the literature. These include high strength concrete (HSC) with
compressive strength of 40 < f'c < 107 MPa. The investigated variables were, fibers
factor (F), area of reinforcement perpendicular to shear plane (ρvfy), and concrete
compressive strength (f'c). The proposed expression gave good prediction for the
direct shear strength of the tested specimens-the proposed expression predicted the
direct shear stress resistance of tested/calculated values with a coefficient of
variation (COV) of 12.88 percent.

Several aspects of magic square studies fall within the computations all universes.
Experimented computation has reverted patterns, some of which have lead to analytic
insight. With the aid of arithmetic modular and the properties of it, we get magic
squares, also we use the algebraic operations of matrices which are addition,
subtraction, multiplication, transpose, rotation, and reflection, then discuss the results
that we are obtained, the eigenvalues of these magic squares are also computed and we
get some magic squares with the same eigenvalues, the inverse of the magic squares
which are found by using arithmetic modular are also magic squares. An example with
order 3 of magic square is given to explain our results

In this study, the mechanical properties of five different cement based repairing
materials were evaluated. These materials were classified into two groups:
laboratory made materials with or without admixtures (3 types), and other two
types of commercial proprietary pre-packaged with additives. Mechanical
properties, such as compressive strength, modulus of rupture and drying shrinkage
were studied.
Results show that these mechanical properties were varying significantly from
each other. The drying shrinkage of the commercial proprietary repair materials
was less than that of the conventional mortar. This will lead to a reduced cracking
risk in the former repair materials compared to the latter. Through the regression
analysis on the experimental data collected, power relation with coefficient of
determination of 0.766 is obtained between compressive and modulus of rupture

The influence of moment of inertia and aerodynamic parameters on the
aerodynamic coupling in rolling mode has been analyzed for Aircraft F-94A (case
study) for different rolling rate in rolling mode , the equations of motion for
aircraft has been analyzed to get the required equations of motion for aerodynamic
coupling. The stability of these equations has been tested by Routh Discriminate.
The influence of moment of inertia and aerodynamic parameters on Routh
Discriminate was clear, for example the wing span was the most positive influence
on aerodynamic coupling stability.

A composite of copper powder reinforced with SiCp (0-10 wt%) in which
aluminum powder of ( 2 wt%) was added for improving wettability of the ceramie
phase. . The composite mixture was prepared by mixing with a ball mill for one
hour to ensure a homogenous distribution on the composite .Gteen compacts
pressed at (350MPa) a steel mold of (12mm)diameter were then sintered at (900
°C) for two hours in an electric furnace, in argon atmosphere . Optical microscopy,
Density, porosity content and Vicker's hardness test were then conducted for the
sintered samples.
Obviously, it was concluded that there was enhancement of the physical and
mechanical (hardness) properties of the sintered compacts with increasing the SiC
content.

To The aim of this research is to study the effect of 5 wt % Al2O3
addition Al- base alloy on sliding wear resistance under dry sliding
conditions using pin- on- disc machine . Wear test was conducted
after squeeze casting under different pressure ( 30 , 60 , 90) Mpa.
The results show that wear rate for Al- base alloy composites
increases with increasing applied load but decreases with increasing
sliding speed conditions . The composites which casting at 90 Mpa
pressure represents lower wear rate than those which cast at 30, 60 Mpa
pressure and the base alloy . The results also observed that the
coefficient of friction increasing with increasing sliding time but reaches
to the steady state after 200 sec. The microhardness and ultimate tensile
strength increases with increasing squeeze casting pressure.

The effect of laser on growth of 2 Type from Bacteria G ve (Escherichia coli)
and G+ve (Staphylococcus aureus) was studied, by radiated the samples in a
different periods (5,10) min. S. aureus was more effected from E.coli , also the
sensitivity to Antibiotics was studied befor and after radiated to laser diode
power(5mw) and some different s was observed to the sensitivity of antibiotics
from this bacteria

This research involves studying the effect of some different protection methods
to increase electrochemical corrosion resistance of medium carbon steel (DIN
CK50) in 3.5% NaCl by applying coating with Cr and Sn, with addition of
inhibitors (No3¯, PO4 , MnO4=and SO4=) and application of cathodic protection
by sacrificial anode using Zn anode.
Evaluation of corrosion resistance after different protection methods were
measuring performed by static potential test and measurement of corrosion
parameters (potentional and current density) by Tafel extrapolation method. The
surface of protection specimens was examined by using optical microscopes.
The corrosion rate results show that using coating and inhibition methods give
good results in increasing the corrosion resistance compared with the cathodic
protection which gives an objective result depending on sacrificed pole

Two methods of Multiple Linear Regression have been used in the current study.
The two methods are:
1- All Possibles Regression.
2- The BackWord Elimination Procedure.
To determine the effect of temperature dgrees (ST), the number of population (SP)
the personal income rate (SX, and the electrical power consamption (SY) in Basra
during the period (2001-2010) the results of data were obtained by using the
statistical program (SPSS). It is found that, there is significant effect of the above
variables the income per capita at the rate (SX), temperature dgrees (ST) and the
number of population (SP) consumption of electricity power (SY). The value of the
extension and its adjustment were obtained to show the significant also the
Significant extents of these factors was examined interpretation of the impact of
electricity power consumption (SY) for the factors the number of population (SP),
temperature dgrees (ST) and the income per capita at the rate (SX).The values of
Regression factors b0, b1, b2, and b3 were obtained also.