The evaluation of the capacity of signalized intersections is one of the most important
parameter used in the planning, design, operation and management of urban street
networks. The calculation of capacity depends on the estimation of the saturati
on flow of
the signalized intersections.
The highway Capacity Manual (HCM 2010) is used to estimate and analyze the saturation
flow. This method is widely used in many countries around the world, including Syria. It
reflects the local conditions in the United States of America; therefore it may not be
suitable for use in our local conditions.
This study includes estimation of the field saturation flow depending on the headways
between the vehicles in the queues, and comparing the field results of the saturation flow
with the values resulting from using the HCM. The study was conducted on three
intersections in the Tartous city. The analysis was based on data collection using video.
The final results confirmed that there is a clear difference between the field measurement
of the saturation flow and computation value, Which confirms that it cannot be used for
our local conditions.
This research focuses on optimising the traffic control at ( Al-
TARBYA) signalised intersection in Homs city to improve its
capacity and the Level Of Service (LOS).
The importance of this research comes from analysing the
movement of vehicles, p
edestrians, the intersection geometry, signal
phasing plan on the intersection, and referring to some problems
affects the intersection in order to get the best improvement to
traffic movement at the aforementioned intersection.
In this work, the processing of aluminum alloys - copper, which
added amounts of copper to aluminum in different parentages (2.5-
4-4.5%) so as not to exceed the limit of saturation Aluminum 6 %(
copper).
In this research, has been studied the spread of chromium atoms mechanism, and mechanical and chemical and properties of the diffusion chrome coating layer in low carbon steel, which is considered one of the surface treatment techniques. Where many p
ractical experiences were carried out in the powdery saturation milieu to form a diffusion coating layer containing atomic chromium who will spread inside the painted
surface, and has studied some mechanical and chemical properties after doing diffusion chrome coating.
The tests results showed that the tensile strength and micro hardness and chemical corrosion resistance improved after the diffusion chrome coating, also increased the depth of coating layer By increasing the retention time in the oven and temperature, where this relationship is reflected with curve of the second degree. Conversely ductility decreased.
Search results confirm the possibility of using diffusion chrome coating as a promising treatment in raising the efficiency of machinery elements that prone to oxidation or chemical corrosion in different temperatures.
Evaluation of present and future traffic situation is carried out for estimating the level of service through a lot of traffic indicators (such as Saturation Flow, capacity, delay and travel time), but all these indicators are based primarily on the
measurement of Passenger Car Unit (PCU) .This paper analyzes the impacts of
four different types of vehicles on the capacity of signalized intersections. Data was collected at five intersections in Damascus city, and estimates of mean headways associated with four different types of vehicles, as well as passenger cars. Using the estimated headways, Passenger Car Equivalents (PCEs) were
calculated, and these suggest that the impacts of these types should be given special consideration when analyzing the capacity of signalized intersections.
This study is conducted to assess the role of hepcidin as a biomarker of iron status in haemodialysis patients. The study included88 patients who had end-stage renal disease ( ESRD), and were treated with haemodialysis in the Department of Renal Medi
cine in Al-Assad University Hospital in Lattakia.
Serum hepcidin and ferritinlevelswere measured, and transferrin saturation (TSAT) was calculated after measuringthe total iron binding capacity (TIBC), these markers were then attached with iron and compared to know the hardest correlation.
Results show that all the patients had high serum hepcidin levels,there was a statistically significant relation between iron and hepcidin, where P-VALUE smaller than 0.05, this relationship was inversal, hardly 40% the stongest correlation.
Conclusion:
These findings suggest that the increased hepcidinin haemodialysis patients may contribute to abnormal ironregulation and erythropoiesis, and may be a novel biomarker of iron status and erythropoietin resistance.
Aluminum alloys have got extreme industrial importance since 19th century
until now. They enter into several light and heavy industries. aluminum is
hardened by impurity due to industrial application. In this study, aluminumcupper
alloys (with 0.5
% Mg) were prepared, where cupper amount was added
to aluminum in different percentages (2.5%,4%,4.5%) ,no overtaking degree of
saturation 6% of the weight of cupper. After adding definite percentage of
cupper to aluminum, the compounds are fusioned for complete blending, where
cupper atoms diffuse into aluminum. Samples are infusioned by definite
methods and circumstances. The prepared alloys were thermally treated during
8-30 hours for hardening. In this research we will concentrate on the influence
of cupper content on hardening of aluminum and other basic conditions, which
are needed to obtain higher hardness for aluminum alloys.
We present a PC controlled apparatus, we have built up to measure
automatically forward electrical characteristics and capacity versus voltage
characteristics, of schottky diodes. Methods used to extract electrical
parameters of these diodes (leak
age current, Schottky barrier height and
substrat doping concentration) are described. These methods were applied to a
commercial Schottky diode, used as Alpha particles detector (surface barrier
detector), and the obtained results were compatible with the expected ones.
