Print ISSN: 1681-6900

Online ISSN: 2412-0758

Issue 7,

Issue 7


Signal Quality Improvement for Mobile Phone Using the Pico Cells in Dense Phone Usage Areas

Sameir A. Aziez; Manal Hade Jaber; Burak Abdul hadi A

Engineering and Technology Journal, 2012, Volume 30, Issue 7, Pages 1108-1116

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.

An FPGA Based a Digital Circuit Design for Route Optimization

Ivan A. Hashim

Engineering and Technology Journal, 2012, Volume 30, Issue 7, Pages 1117-1131

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.

Study of Three Dimensional Fluid Flow inManifold-Laterals System

Jafar M. Hassan; Wahid S. Mohammad; Ayad F. Hameed

Engineering and Technology Journal, 2012, Volume 30, Issue 7, Pages 1132-1148

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.

A New Approach on Decision Making for Multi- Objectives Problems

Allaiden N. Ahmed; Haithem Saleem; Saad Mohsin Salman

Engineering and Technology Journal, 2012, Volume 30, Issue 7, Pages 1149-1153

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.

Heuristic Dispatching Rules for Dynamic Scheduling of Heavy Engineering Equipments

Luma Adnan Al-Kindi; Sawsan Sabeeh Al-Zubaidy; Alla Eldin H. Kassam

Engineering and Technology Journal, 2012, Volume 30, Issue 7, Pages 1154-1173

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

Development of Job Scheduling and Machine Loading System in FMS

Zaid Hikmat Yaqoub; Amjad Barzan Abdulghafour

Engineering and Technology Journal, 2012, Volume 30, Issue 7, Pages 1174-1186

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.

Predicting the Strength of Fiber Reinforced High Performance Concrete Based on Push-Off Tests

Maha M.S. Ridha; Nagham T. Hamad; Kaiss F. Sarsam

Engineering and Technology Journal, 2012, Volume 30, Issue 7, Pages 1187-1202

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.

Computation of Odd Magic Square Using a New Approach with Some Properties

Shatha A. Al-Najjar; Nuha A.R; Fuad A.A.l-Heety

Engineering and Technology Journal, 2012, Volume 30, Issue 7, Pages 1203-1210

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.

Mechanical Properties of Polymer-, Pozzolanic Cement- Based Repairing Materials

Qais J. Frayyeh; Maan S. Hassan; Tahseen D. Saadoon

Engineering and Technology Journal, 2012, Volume 30, Issue 7, Pages 1211-1221

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.

Effect of Moment of Inertia and Aerodynamics Parameters onAerodynamic Coupling in Roll Mode

Raed Abbas Jessam

Engineering and Technology Journal, 2012, Volume 30, Issue 7, Pages 1222-1239

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.

Studying Properties of Cu-Al-SiC Composites Prepared by P/M Technique

Ziyad S. Ahmed; Ali M. Mousa; Samir B. Younis

Engineering and Technology Journal, 2012, Volume 30, Issue 7, Pages 1240-1248

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.

The Effect of Ceramic Particale Oxides addition on Wear Resistance of Composite Material for Aluminum Base Alloy

Israa Abdulkader; Maryam Abduladhem

Engineering and Technology Journal, 2012, Volume 30, Issue 7, Pages 1249-1264

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.

Effect of Antibiotics with Laser Radiation on Growth of Two Pathogenic Bacteria Species

Buthynia abd-alhamza; Nehia N. Hussien; Saria D. Mohamed

Engineering and Technology Journal, 2012, Volume 30, Issue 7, Pages 146-157

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 .

Evaluation of Corrosion Resistance of Medium Carbon Steel Using Different Protection Methods

Firas Farhan Sayyid; Ali Abdul Munim Ali; Wadhah Adel Tawfek

Engineering and Technology Journal, 2012, Volume 30, Issue 7, Pages 158-168

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.

Using Multiple Linear Regression Models to Determine the Effect of Some Factors on Consumption of Electricitrical Power in Basra

Haithm saleem dawd; Saad mehsn Selman; Latefa Abdulla Dawd

Engineering and Technology Journal, 2012, Volume 30, Issue 7, Pages 169-178

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.