Journal of College of Education

Abstract
The present work aims at decrease the cost of the photovoltaic (PV) solar
system by decreasing the area of expensive solar cells by low cost optical
concentrators that give the same output power. Output power of two types’
monocrystalline and polycrystalline silicon solar cells has been measured with
and without presence of linear focus Fresnel lenses (FL) with different
concentration ratios. Cooling system has been used to decrease the effect of
temperature on solar cell performance. The results indicated that the increase in
the output power is about 5.3 times by using Fresnel lens concentrator without
using cooling system in comparison with solar cell without concentrator, while
it is about 14.6 times by using cooling system. The efficiency of
monocrystalline solar cell without cooling system is about 11.2% for solar
irradiance 0.698 kW/m2, this value decrease to 3.3% for solar irradiance 12.4
kW/m2 and concentration ratio 17.7 by using Fresnel lens concentrator, while
when using cooling system the efficiency enhance to 12.9% and 8.8% for solar
irradiance 0.698 and 12.4, respectively

Abstract
In any object classification system, there is a need to extract features and
use them to classify the objects, most of the extracted features have succeed
to classify some object but failed to classify others. Feature selection is a
general problem used for dimensionality reduction purposes. Feature
selection aims to select important features. The major objective of the this
paper is to use the Binary Cuckoo Search(BCS) to select important features
from the set of the extracted features. The feature extracted were grey level
features ( texture features ), the size features, shape features and the optimal
feature has been selected by BCS. Support vector machine (SVM) classifier
used in BCS as a fitness function. The cuckoo search algorithm select only
seven feature from (25) features where performed average accuracy 92%
and improve the classification time from ( 1.55 ) second at average to ( 57
) millisecond at average.

Abstract
Recent meteorological studies emphasize that there are air currents at
high attitudes within the Tropopause.These high air streams are so fast and
move from west to east continuously. Because of its high speed they are
called jet streams.The strongest ones are polar jet streams whose highest
speed reaches 500 km / h. Aviation depends on such important factors as
jet stream locations and speed and the distance between them and polar as
well as subtropical jet streams and the countries in which they’re found.
Aircraft flying in the direction of jet stream winds saves time and fuel . For
example, a plane flies at 500 knots takes 6 hours to cross 3000 kilometers
in still air while the duration can go down by 10 per cent , i.e. , it can take
only 5 hours and 27 minutes if the wind speed is 500 knots.
Jet streams can cause disturbances and problems, e.g,.
if they are strong enough, they can cause a sudden 30 meters drop for the
plane.They can influence surface activities and systems and consequently
flying itself.It has been found that the very active parts or fronts may cause
a change in wind speed between 0.10 to 0.15 s for many hours while
measured 0.12 S with thunderstorms.
Depressions get greater at Horse latitudes where both polar and tropical
streams are combined.
Monitoring the clouds of the cyrus and the tusksis is important in
identifying the locations of jet streams. Studies show that climatic
conditions are key reasons behind aviation accidents where their percentage
reaches 40 - 60

Abstract:- The study area (Wadi Tharthar basin) is located between two
galleries (34:23:35 and 36:30:30) to the north, and a long (41: 35:17and
43:26:18) east. The problem of the study lies in the absence of a detailed
study to determine whether the area is located in negative or positive
environmental conditions that help the existence of agricultural land and
what kind of land. The study assumed that the environment of:
the study area made it an area of different types Of agricultural land, where
geographic information systems (Arcgis, 10.3) were used in data analysis,
relying on maps (elevation, grid The area of the study, divided into three
types of land, an excellent type of grazing and forests in the first stage
occupies the largest area extending from north to south and from east to
west Except for part of the north-east and south-east of the area occupied
by the second type, the average quality of agriculture, the latter type is not
suitable for any agricultural production is scattered in the western parts of
the study area, and therefore must be taken measures that will work to
exploit these areas Wass Of agricultural purposes.

Abstract
In this work, copper oxide (CuO) nano-rice structure was prepared by
hydrothermal method. The prepared samples were characterized by X-ray
diffraction (XRD), field emission scanning electron microscope (FESEM),
and UV-visible spectrophotometer. CuO nano-rice structure showed high
photocatalytic activity towards degradation of methylene blue (MB).
Hydrothermally growth of CuO provided uniformly distributed nano-rice
structures with high degradation efficiency (90.41%) and rate constant (kt)
16.6 × 10-2 min-1 for methylene blue degradation.