Engineering and Technology Journal

The process of scheduling is considered as one of the more important production
planning processes which faces the management of companies, because of the pressure
of competition processes. The management of companies and firms take automation of
this process to get speed and precisions to take suitable decisions. Various kinds of
scheduling problems have received a lot of attention from researchers in a number of
fields. So far research has primarily been focused on finding a good solution with
respect to makespan and total completion time. Heuristic rules have strong advantages
in that these are easy to understand, easy to apply and require relatively little computer
time. For that the researcher has designed a system aided by computer for operations
scheduling on machines in job shop production system based on new heuristic rules to
help scheduler in solving problem in this field. This system is named "Computer
Aided-Job Shop Scheduling" (CA-JSS). It is construction based on two suggested rules
those are called "Modified Least Work Remaining" and "Modified Most Work
Remaining". We wiII apply it particularly on group of cases. We have been divided
these cases into two stages. In the first stage ten examples taken from scientific
references are used as theoretical cases, in second stage we take practical case from
State Company for Electrical Industry (SCEI). The CA-JSS proved its efficiency and
ability in scheduling the operations. The results appear for this system in some cases
best than (Win QSB) softwar

In this paper we have defined the T-operator ,T-semia -operator and
we studied the relation among them, and we define T-semia -open, Tsemi
a -regular, and monotone operator, also we defined (T,L) semia -
conations ,(T,L) strongly semia -continues ,(T,L)semia-homeomorphism
,(T,L) strongly semia -homeomorphism and we study the relation among
them .

This research studies the effect of adding industrial wastes materials with
different percentages on the thermal and mechanical properties of clay
bricks . Different types of admixtures were used in this work, including
rubber cuttings, wood saw dust and barley reeds ash with ( 5%,10% 15%
,20% ) by weight of each one respectively. Thermal conductivity, specific heat
capacity, compressive strength, flexural tensile strength, porosity and variation
of density have been examined for each samples at all percent of addition
and comparing with the reference clay bricks samples . Test results show that
the admixtures effect on the properties of clay bricks, when used barley reeds
ash which the best additives because take good properties, the density of clay
bricks is reduced 33%,thermal conductivity reduced 46% and the compressive
strength increased 20% comparing with the standard bricks. The experimental
work carried in the industrial factory of clay bricks in the Nahrawon city in
Baghdad.

In this study, a model for predicting the ultimate strength of rectangular
concrete filled steel tube (RCFST) beam-columns under eccentric axial loads has
been developed using artificial neural networks (ANN). The available experimental
results for (111) specimens obtained from open literature were used to build the
proposed model. The predicted strengths obtained from the proposed ANN model
were compared with the experimental values and with unfactored design strengths
predicted using the design procedure specified in the AISC and Eurocode 4 for
RCFST beam-columns. Results showed that the predicted values by the proposed
ANN model were very close to the experimental values and were more accurate
than the AISC and Eurocode 4 values. As a result, ANN provided an efficient
alternative method in predicting the ultimate strength of RCFST beam-columns

The main objective of this research is to evaluate the improvement of embankment
soil foundation soil using the fiber glass treatment. To accomplish the main objective,
laboratory tests, includes direct shear test and unconfined compression test are made to
evaluate the potential of acting the fiber glass as cementing agent in terms of strength
parameters (cohesion and angle of internal friction). The ANSYS program of version
(12.1) was employed for analyzing embankment foundation system. The results
showed that increasing the percent of fiber glass from (1 to 3%) reduce the vertical and
horizontal displacement about (75%) at 3%, and reduced the horizontal and vertical
strain about (75%, 85%) respectively at the same fiber glass content (3%). This means,
that the general role of adding the fiber glass works as a tender to soil mixture not as
fiber reinforcement. So it can be concluded that the fiber glass act as cementing agent
as shown in the obtained experimental results for strength parameters (cohesion and
angle of internal friction ) from the direct shear and the unconfined compression test
that carried out in this works

In this paper, an FPGA (Field-programmable gate array) model of digital single
phase power factor optimizer has been built. The proposed optimizer is based on
measuring the phase shift time between voltage and current waveforms. Therefore,
it is required to reduce this time to make the voltage and current waves in phase as
possible. Thus, the power factor will be in maximum value (closed to unity). The
process of improving the power factor is carried out by connecting a set of
capacitors in parallel with the load. The proposed power factor optimizer has been
built using VHDL (Very high speed integrated circuit Hardware Description
Language), simulated using Xilinx ISE 9.2i package and implemented using
Spartan-3A XC3S700A FPGA kit. Implementation and Simulation behavioral
model results show that the proposed optimizer satisfies the specified operational
requirements and reflected impressive results when applied to different loads

Bending process is the one important process in the sheet metal forming in
many industries, the main problem of bending process is the spring back
phenomenon which is happens after removing the punch. This research involves
theoretical and experimental study of the effect of holding time on spring back
value of sheet material in V-bending die with 900, with different rolling direction
and different holding time (0,10,20,30) min. (Al –Si) alloy having the thickness of
(2 mm) were employed as the work pieces material for all experiments. The results
revealed that as the hold time increases, the spring back decrease and spring back
ratio increases.

Permanent Magnet Brushless DC (PMBLDC) motors are generally powered by
a conventional three-phase voltage source inverter (VSI) or current source inverter
(CSI) which is controlled using rotor position. By varying the commutation
(switching) angles of the transistors in the inverter circuit, the performance of these
motors could be greatly varied. This can studied in this paper using the dynamic
motor model, which was performed using Matlab/Simulink software package. A
study on the influence of switching angles on motor performance shows that the
motor operates better when advancing the switching angle, and there is certain
angle at which the motor operates with the highest efficiency. An improvement of
the different operating characteristics of PMBLDC motor has been accomplished
by adjusting the chosen set of the switching angles and using appropriate
conduction angles

Experimental and numerical simulation study for natural convection heat
transfer formed by uniformly heated inclined elliptical cylinder concentrically
located in an enclosed square cylinder subjected to the ambient have been
investigated. Experiments have been carried out for Rayliegh number ranges from
0.9×106 to 3.3×106. The enclosure angles of inclination are f =0o (horizontal), 45o
(inclined), and 90o (vertical), and for axis ratio of elliptic cylinder
(minor/major=b/c) of 1:2, while the dimensions of outer square cylinder was
0.5×0.5×2 m. A numerical simulation was conducted by using commercial
Fluent CFD code to investigate the steady laminar natural convective heat
transfer for air between a heated elliptic cylinder and its square enclosure. It
covered a range of hydraulic radius ratios (HRR) of 1.97, 2.62, and 3.93 and
for orientation angles j = 0o (the major axis is vertical), 30o, 45o. Two
values of Rayligh number were taken: 0.9×106 and 3.3×106. The experimental
results showed that the heat transfer process improves as Rayliegh number
increases and is better in f =0o than other angles of inclination at the same
heat input. Theoretical results showed that the HRR, Rayligh number, and
angle of orientation have significant effect on the physical

A variety of different chemical compositions Titanium-Aluminum-Carbon thin
films were achieved by combinatorial magnetron sputtering. The as-deposited
ternary diagram can be divided into two regions. The first region consists of
titanium carbide structure with substitutional Aluminum atoms at the Carbon rich
side of the diagram. The second region consists of the amorphous phase at the rest
of the appearing diagram. At 500°C the amorphous phase transforms to titanium
carbide structure with substitutional Aluminum atoms and at 600 and 700°C many
ternary phases have been shown by X-ray diffraction at different regions while the
Carbon rich side sustains the titanium carbide structure with substitutional
Aluminum atoms. This work could be considered as a leading study in the way to
produce the ternary ceramics at temperatures below the conventional ranges in
powder metallurgy as it had been proved earlier by us.