Engineering and Technology Journal

Alumina-doped Zinc Oxide (AZO) thin films on quarts glass substrates
have been deposited by pulsed laser deposition technique using a pulsed Nd-YAG
laser with the wavelength of (λ= 532 nm) and duration (7ns).
The structural and optical properties of these films were characterized as a
function of Al2O3 content (0-5w.t%)in the target at substrate temperatures (400°C)
and energy fluence (0.4 J/cm2). The X-ray diffraction patterns of the films showed
that the undoped and Al2O3 -doped ZnO films exhibit wurtzite crystal structure
and high crystalline quality. The optical properties were characterized by
transmittance, absorption spectroscopy measurements. For all films the average
transmission in the wavelength range (330-900) nm was over 90% and the
absorption edge shifted toward a shorter wavelength as Al2O3 concentration
increased. The optical energy gap of Al2O3 doped ZnO thin films, measured from
transmittance spectra could be controlled between (3.32eV and 3.59eV) by
adjusting alumina concentration. AFM results show that the samples with
increasing concentration of Al2O3, the surface roughness increases

Our focus in this paper is to study the behaviour in the limit of the discrete
classical optimal control problem including partial differential equations of
nonlinear hyperbolic type. We study that the discrete state and its discrete
derivative are stable in Hilbert spaces 1 H0(W) and L2(W) respectively. The
discrete state equations containing discrete controls converge to the continuous
state equations. The convergent of a subsequence of the sequence of discrete
classical optimal for the discrete optimal control problem, to a continuous classical
optimal control for the continuous optimal control problem is proved. Finally the
necessary conditions for optimality of the discrete classical optimal control
problem converge to the necessary conditions for optimality of the continuous
optimal control problem, so as the minimum principle in blockwise form for
optimality.

The nonlinear thermoviscoelastic behavior of composite thin plates is
investigated. An experimental program covers an achievement of creep tests under
different temperatures, dimensions of specimens and distribution loads to describe
the equation of creep compliance. The stress relaxation is also determined from the
experimental creep compliance.
A new equation of creep compliance function D(ts, ,T) and relaxation
modulus E(t,e,T) were predicted from the experimental results to describe the
nonlinear thermoviscoelastic behavior of composite thin plates. A good agreement
has been observed between the proposed models of nonlinear behavior at different
temperatures and experimental results and between both theoretical and FEM
results.
It was found that thus the deflection is increasing at the beginning and the rate of
increase is nearly constant and increase with increasing temperature from 30 Co to
60 Co with approximate rate (34.6%) for simply support plate at distributed load
(q=1.934E-3 N/mm2), relative dimensions (a/b)=1.0 and time=15 min.
The results indicate that the shear stress increases with rate (50.7%), so that strain
in y-axis increases with rate (19%) as a result of increase the temperature from (30
Co to 60 Co).

Our main concern here is to give an approximate scheme to solve a linear
Fredholm integro–differential equations of higher–order (LFIDE) using expansion
method with the expansion functions as basis functions associated with weighted
residual technique ( collocation method ). Computing of singular value
decomposition (SVD) has been used to treat these equations approximately. For
this method a program is written in matlab (ver.6.5), examples are solved, results
are tabulated and comparison is made between the exact and the approximate
solution depending on least squares error method.

This paper presents design and implementation of adaptive
modulation modem for WiMAX system. (BPSK, QPSK, 8QAM, 16QAM,
32QAM and 64QAM) are used in this work. Software Defined Radio(SDR)
is used for implementing this modem. This work examines the benefits of
using adaptive modulation in terms of probability of bit error and spectral
efficiency. It specifically examines the performance enhancement made
possible by using linear prediction along with channel estimation in
conjunction with adaptive modulation. Simulation results proved that the
adaptive system performance with estimator and predictor is better than
other modulation alone. The simulation results for adaptive modulation in
compared to each modulation technique alone show that for BER=10-3 with
(fd=50Hz -200Hz)system the improvement occurs by decreasing S/N by 2-
3dB. As for BER=10-4 with same Doppler frequency, the system
improvement takes place by decreasing S/N by 1.3dB- 4dB. Recarding
BER=10-5 with same Doppler frequency, the improvement is by decreasing
S/N by 1.5dB-5 dB. Simulation results also show the flexibility of the
adaptive system to operate with different level of modulation based on
switching of S/N. Matlab7.8(R2009a) used for simulation of adaptive
modulation system with AWGN and fading channel

Construction joints are stopping places in the process of placing concrete, and
they are required because in many structures it is impractical to place concrete in one
continuous operation. The amount of concrete that can be placed at one time is
governed by batching and mixing capacity and by the strength of the formwork. A
good construction joint should provide adequate flexural and shear continuity through
the interface.
In this study, available experimental tests were analyzed by using a nonlinear
three-dimensional finite element ANSYS computer program (v. 9). In addition an
interface model was proposed for the transverse construction joints.
Six beams with different transverse construction joints at mid-span as well as to
one reference beam without joint are analyzed. The reliability of the model is
demonstrated by comparison with the experiment and alternative numerical analysis
which shows 5-7% difference.

D-EDFA have their signal gain distributed over long fiber lengths. This paper
deals with gain and noise figure characteristics at 150dB/km Rayleigh constant of a
forward, and bidirectional pumped distributed EDFAs, operating in 1550 nm as a
function of fiber length, Erbium ion density, injected pump power and signal input
power. These studies are done by using optiystem 6.0 software simulation (optical
amplifier and communication system design software) at bit rate of 2.5 Gbps.

The behavior and performance of job shops have been the focus and
attention in both operations research and operations management literature. Job
shop scheduling has received this large amount of attention, because it has the
potential to dramatically decrease costs and increase throughput, thereby, profits.
Moreover, the increasing of product customization creates more job shop
environment in manufacturing world. No doubt, a wide variety of approaches to
the modeling and solution of job shop scheduling problems have been reported in
the literature. But, the research in this area is continuous. In this paper, Multistage
Heuristic Algorithm based on priority dispatching rules is developed. This
algorithm has been implemented to solve three cases. Schedules generated have
been compared with those obtained by means of the basic algorithm. As a result,
Multistage Heuristic Algorithm shows the ability of minimizing: machines idle
time, total time of machines and makespan

Amathematical procedure for optimization depends on the evolutionary
algorithm has been proposed to estimate the optimum design of single mode
optical fiber upon finding the core and cladding material and core radius. The
results of the optimum design achieved minimum total dispersion and minimum
dispersion slope. The operating wavelengths are chosen in the range (1500-1600)
nm. The optimization using evolutionary algorithm can explore all the possible
solutions and then choosing the best solution that has maximum merit function.

In this work, we present the power series method for solving special types
of the first order nonlinear Volterra integro-differential equations of the second
kind. To show the efficiency of this method, we solve some numerical examples

This study has been designed to investigate the toxicity effects of
polyvinyl alcohol at different concentrations on peripheral blood lymphocytes by
measuring each of blastogenic index, mitotic index and chromosomal aberration in
addition to the polymorph nuclear leukocytes activity through determine both of
the phagocytosis percent and phagocytosis index .The results show that PVA have
no toxic effects at the concentrations 0.1,1,10,100,250 μg/ml because the
cytogenetic parameters undergo not significantly raised (at P < 0.05) and
phagocytosis percent and phagocytosis index have been increased significantly (at
P ≤ 0.05). The immune response has been found to be significantly too (P ≤
0.05) in the presence of PVA with Candida albicans antigen as adjuvant via
increasing the foot pad swelling in the immunized mice with 50 μg/ml of
C.albicans antigen.

The power conversion efficiency of organic solar cells based on donoracceptor
blends is governed by two competing processes, extraction and
recombination of charge carriers. Both processes are strongly dependent on the
charge carrier mobility. Using microscopic effective medium simulation, we
demonstrate that the best device efficiencies are achieved in the mobility range
. For lower mobilities lead to losses by bimolecular
recombination and higher mobilities lead to a reduction of the open circuit
voltage, and consequently a drop in efficiency

The protection of civil structures, including their material contents and
human occupants, is without doubt a world-wide priority of most serious current
research. Such protection may range from reliable operation and comfort, on one
hand, to serviceability on the other. Examples of such structures which leap to
one’s mind include buildings, towers, and bridges. In like manner, events which
cause the need for such protective measures are environmental like earthquakes
and winds, or moving loads like cars and pedestrians in the case of bridges.The
earthquake hazard is translated in severe vibrations for the structural systems. In
order to handle this world wide problem auxiliary damping devices is added to
absorb those vibrations. One of the early used damping devices is the Tuned Mass
Damper (TMD) which is a passive system in that it absorbs the structural response
without adding an external control signal. In this work a case study of three stories
building model excited by a simulated earthquake hazard is investigated versus the
response of the same building supplied by a TMD.

In this study, the compatibility of polymer modified repair mortar and
substrate concrete was investigated in three stages. First stage includes studying the
individual properties of polymer and conventional repair materials, and also two
types of concrete, such as compressive strength, split tensile strength, and flexural
strength using standard ASTM test procedure. Second stage includes evaluating the
bond strength of composite cylinder for different combinations of repair materials
and substrate concrete. Third stage includes investigating the compatibility using a
composite beam of repair material and substrate concrete under third point loading.
The experimental results show that the compressive strength, split tensile
strength and flexural strength is not a crucial factors for the success of concrete
repair system. While bond strength tests are provide strong indication about the
compatibility. The bond strength of S.B.R polymer material produced by Al-
Khaleej Company was not strong enough to be recommended to use for concrete
repairing systems

The main theme of this paper is to approximate the solution of ordinary
differential equations by using basis of generalized spline functions then using
tensor product analysis to generalize the approximation for solving partial
differential equations, (PDE's).

In the present work simulation of impact response using LS-DYNA explicit
finite element code is described to investigate the crash behavior and energy
absorption characteristics of square glass fiber reinforced plastic tubes, subjected to
impact load. Filament-wound tubes with two layers [+45º, -45º] were fabricated
and tested. The experimental crushing characteristics data are compared with the
obtained numerical results, showing good agreement. The effect of geometrical
parameters, winding angle and the failure mode on the energy absorption
characteristics are also investigated.

Butter was produced from a mixture of anhydrous milk fat and reconstituted
dried skim milk in a ratio of 1:3 and different percentages (0-5%) added to starter
mixture. Electrical butter churner was used for
butter production. Composition, physicochemical, microbiological, and
the effect of cold storage at 8ْC of the resultant butter were studied. The
composition of the resultant butter was similar to natural butter and it was awarded
a total score of 92.5 for the organoleptic properties (taste, flavor, shape,
body(texture), color) as
compared to 97.0 for the natural butter. The pH of butter was reduced from 6.5 to
4.5
with increasing the added starter from 0 to 5%. Peroxide values of freshly prepared
butter were 0.15-0.30 and increased up to 0.25-0.45 after 4 weeks of cold storage.
The total bacterial counts, coliform counts, yeast and mold counts were within the
limits of the standards

In this research is improvement of physical and mechanical properties by
solvent the styropore with labaritory benzene (C6H6) and then mixing with
different weighted ratio of carbon particles ( 2.5 , 7.5 , 15 , 30 and 60 )% at size
less from 63μm were added to dissolved styropore to proper samples were
applied to many tests of dielectric constant, hardness, thermal conductivity

ISO 9001 certificate becomes an important issue in the resent time specially
for global objectives companies that have an extended activities over different
countries. ISO certificate considered as passing permit which over come all
barriers and introduce a company, establishment, or organization to customers
certifying its products and management compatibility to the certificate
requirements.
Locally the certificate becomes an important effort toward applying the mentioned
specification due to different reasons. The first reason is organizationally to create
an environment conditions to achieve quality in their products and operations

This work aims to study the properties of tensile strength of lime stabilized gypseous
soil considering to the following variables: curing conditions which include the temperature
and duration of curing and initial water content. In addition, the effect of wetting and
drying cycles on the tensile strength was carried out. The soil was stabilized with a (3%)
lime as a results of the unconfined compressive strength. The results indicated a significant
improvement of the tensile strengths, and increases with the curing temperature and
duration. When the curing duration extended to (180) days at (49, 60C0), a reduction in the
tensile strength occurred as compared with the samples cured for (90) days. The effect of
drying and wetting cycles on the tensile strength for the lime treated soil were investigated.
The treated samples were subjected to (15) cycles of drying and wetting, the results showed
a reduction in the tensile strength varied between (2-64 %).