The walls containing phase change materials (PCM) play a significant role in the
air conditioning of buildings. However, one of the characteristics which limits the use
of PCMs is their low conductivity. It is possible to solve this problem by coup
ling a
metal matrix with the PCM. The aim of this study is to determine the optimal size of a
wall which allows a complete change of state, and a homogenization of the temperature
without a too fast change-of-state rate. To study the thermal behavior of the wall, we
have carried out a numerical simulation using the COMSOL® software in considering a
unit cell. To describe the change of state, the method of the equivalent heat capacity
has been used. Paraffin has been chosen as PCM (melting temperature 24.5 °C). The
influence of the nature and the volume fraction of the metal were determined. The case
of honeycombs made of aluminum has been specifically treated.
In this study it has been determined the total phenols percentage of
three Syrian honey types. Then the relation has been studied
between phenols level in these three types of Syrian honey and its
effect on the Escherichia coli which causes many t
ypes of intestinal
and uric infections and causes many diseases as bleeding.
The samples of bee pollen were collected from inside and outside
the honey beehives of apiaries situated in five different locations of
Latakia; Al-Qardahah, Al-Haffeh, Jableh, Latakia city and Eastern
Entryway to Latakia during the autumn in 2014
. The
concentrations of three heavy metals, zinc (Zn), lead (Pb), cadmium
(Cd) were determined in pollen by using atomic absorption.
In this research we study some of the most Bio-inspired MAC
protocols widely used in WSNs. we select the protocols which
depends on ant colony optimization behavior (ACO), bee colony
optimization behavior (BCO) and particle swarm optimization.
In this paper, we study the static scheduling issue for the
independent tasks on a homogenous multiprocessor system. In
addition, we develop an algorithm based on Bees Colony
Optimization to solve the scheduling Problem. Thereafter, our
algorithm is compared with a previous one inspired also by the bees
mentioned for the same purpose, and with the optimal solution for
the displayed scheduling Problem.
This study was conducted in the Syrian coastal region, and the honey samples have
been collected from eight different sites belonging to the provinces of Latakia and Tartous
during the autumn of 2012. Their content of heavy metals (zinc, copper, le
ad & cadmium)
was estimated by Atomic Absorption at the Higher Institute for Environmental Research at
Tishreen University. The results showed that zinc concentration in the bee honey samples
ranged from 2.86 to 12.64 mg / kg (mean 7.98±3.67), and copper ranged from 0.125 to
0.652 mg / kg (mean 0.328±0.176 ), lead ranged from 0.084 to 0.378 mg / kg (mean
0.205±0.112), cadmium ranged from 0.0002 to 0.0132 mg / kg (mean 0.0053±0.0052). The
results indicated that the largest amounts of heavy metals were found in honey sample
taken from the apiary which is located at the eastern entrance of Latakia city (near Joud
factory), while the lower concentrations of zinc and lead were in Banias area (Wadi Al
Saqi), and the least concentration of copper was in Safita area, and of cadmium was in the
Gablah area (Bani Qahtan Castle).Comparing elements concentration in the studied honey
samples, Zinc concentration was found to be the highest, followed by copper, lead and then
finally cadmium.The results of statistical analysis indicated the existence of significant
differences between the studied sites during the autumn of 2012.
النشاط المضاد للأكسدة في بعض أنواع عسل النحل السوري: أجري هذا البحث في مخابر كلية الزراعة قسم علوم الاغذية ومخابر مديرية التموين بالتعاون مع قسم وقاية النبات في كلية الزراعة
The experiment was carried out at Jableh region during 2012-2013 in two green
houses to study the effects of using the bumble bees and organic carbon to improve flower
set and yield of tomato hybrid Dalloula . The experiment included three treatmen
ts :
natural pollination (control) ,flowers pollination by organic carbon, and flowers pollination
by bumble bees . The first and second treatments were applied in the first green house , and
the third treatment was applied in the second green house . Results showed that the bumble
bees treatment produced significantly the highest percentage of flower set and yield than
the other treatments . Flower set of tomato over 10 clusters was 89.8% , 83.7% , 39.2% for
bumble bees treatment, organic carbon treatment, and control , respectively. The highest
yield (22 kg/m2)was obtained from bumble bees treatment . Flowers pollinated by bumble
bees gave fruits that looked better in shape , size and color ,and with higher weights . In
the bumble bee pollinated flowers , the quality of fruits was superior for vitamin C , sugar
and acidity .
Scheduling tasks on multiprocessors is considered one of the most
important issues studied to make processors operate without inertia (idleness) and thus to reduce the total time of completion or makespan. This increased interest in studying schedul
ing and its algorithms, especially in multiprocessor systems that need to
arrange the tasks to been optimally implemented.
In this research, we study the static scheduling issue for the
independent tasks on a homogenous multiprocessor system. In
addition, we develop an algorithm based on Bees Colony
Optimization to solve the scheduling Problem. Thereafter, our
algorithm is compared with a previous one inspired also by the bees behavior for the same purpose, and the optimal solution for the displayed scheduling Problem.
The aim of the algorithm is to find an acceptable solution with the
best time through Bees Colony's algorithm. To evaluate our reach,
we Study the effect of increasing the number of tasks when
processors numbers are constant, and the impact of increasing the
number of processors for a number of tasks on the stability of the
presented algorithm.
Our algorithm has shown the ability to obtain optimal value for the objective function in terms of scheduling tests for small and
medium size.
Our results shown that the imposed algorithm gives the best
solution for the scheduling problem, in most cases, and improves
the traditional BCO algorithm.
This study was performed in the Research Laboratory of bees at the Faculty
of Agriculture, University of Damascus, Samples were collected from the
coastal region of Syria (Lattakia and Tartus), during the year 2009-2010, The
work aimed to conduct morphological characterization of bumblebees Bombus
terrestris (L.) in Syria, through some measurements to determine the
distribution (of this type of bees in the Syrian) regions.
