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Register a new userMaintenance of airport floor surfaces from deformations caused by external factors
صيانة سطوح أرضية المطار من التشوهات الناتجة عن العوامل الخارجية
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Aِl-Baath University رسالة ماجستير
Publication date
2018
fields
Transportation
and research's language is
العربية
Created by
Shamra Editor
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يعد الرصيف البيتوميني النوع الأكثر انتشاراًلإنشاء الطرق في الجمهورية العربية السورية ويستخدم بشكل واسع في كافة مناطق العالم حيث تبلغ نسبة الطرق التي تعتمد في إنشائها على هذا النوع من الرصف حوالي 93% في الولايات المتحدة الأمريكية ويعود ذلك لسبب سهولة وسرعة إنشائه وصيانته.
Bituminous pavement is the most prevalent type of road construction in the Syrian Arab Republic and is widely used in all regions of the world. The proportion of roads that depend on this type of pavement is about 93% in the United States of America due to the ease and speed of its construction and maintenance.
References used
الشروط والمواصفات الفنية العامة لأعمال الطرق والجسور الصادرة عن وزارة المواصلات السورية بالقرار رقم 165 تاريخ 1-7-2002
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This work will concentrate on the mechanisms that produce neutralized
atoms upon scattering of ions from metal surfaces. Three mechanisms are
usually considered for ion neutralization at metal surfaces. Those are:
resonance tunneling; Auger neutra
lization and surface plasmon-mediated ion
neutralization. The third mechanism, namely surface plasmon-mediated ion
neutralization, was suggested and calculated by us in an earlier work, where a
unitary transformation was introduced to the second quantized Hamiltonian.
The atoms are described by a state orthogonal to all conduction band states of
the metal. The transformation gave rise to an additional term in the matrix
elements ''the orthogonalization term''. This theory of applying a unitary
transformation to the second quantized Hamiltonian is applied to the resonance
and Auger neutralization mechanisms. The orthogonalization correction to the
neutralization rate is found to be important at small distances from the surface
when, applied to the scattering of protons from aluminum surface.
This study aimed at identifying the concept of human capital migration and identifying the
main internal causes behind the phenomenon of human capital migration in Syria by
studying the impact of a range of economic, social and health factors (unem
ployment rate,
death rate, life expectancy, (15 years and more), the rate of inflation, the graduation rate of
undergraduate students and the graduation rate of students of studies in Syrian universities)
on the rate of human capital migration, based on the data between 1990 and 2010. The
researcher reached the following main results: High inflation leads to l The high rate of
migration of the human capital, while the low unemployment rate leads to the high rate of
migration, but the high rate of employment leads to a slight increase in the rate of
migration and this is because most of the young groups pursue studies outside the country
after graduation, The increase in life expectancy at birth leads to a sharp drop in the rate of
human capital migration. The high percentage of university graduates leads to a high rate
of human capital migration. This is due to the fact that the largest proportion of graduates
prefer immigration to work or to follow them in countries Other,
while a The increase in the proportion of graduates of study students leads to a decline in
the rate of human capital migration. This is due to the fact that they prefer to continue their
education within the country, thus reducing their chances of emigration due to the
continuation of their education or because of their increasing awareness of the importance
of their presence within the country.
Blast load caused emptying a large amount of energy very quickly parts of the
second causing a significant increase of pressure, in addition to generating high
temperatures because of the high speed often ends local effects of the explosion before
the
bridge begins to respond, which causing major damage in the bridge. Most of bridge
design codes didn’t take in account during design the blast load, as well there are no codes
inspection on bridges the blast load. The research aims to study and to facilitate the
understanding of damages caused by explosion load on elements of road bridges through
the facts of explosion and photographs the cases of damages occurring practical and
realistic, and also through some computer models.It has been in the research review the
impact of the blast load on the slab bridges. The distinction between the case of the impact
of the blast load at top and bottom of slab bridge. So the case of the bombing at the top
slab bridge leading to increase the binding moments and shear forces, in against the case of
blasting at the bottom of slab bridges leads to act opposite load for design loads. Also
studied blast load on bridge beams and illustrated resulting addional cross sections. Also
explained the effect of blast load on bridge piers and abutments, and the forms of caused
damages.
In this paper, ground surface settlement induced by tunneling have been studied
using 2D finite element analysis. By assuming greenfield conditions, which means that
there is no loads on the soil surface above the tunnel.
A FE study was conducted
in which an elasto-plastic constitutive model was adopted
to model the soil behavior (MC,HS).
This paper include Comparison between actual field measurements with (FEM)
results, and parametric study for the most factors that influence ground surface settlement.
This research includes evaluating the work of maintenance of themachines through
their own key performance indicators (KPI), and approved byindustrial and service
companies, We mention reliability, readiness ,average time between failures, average
Repair time ,average time of periodic maintenance of their production and
serviceequipment.
After the data processing of emergency failures and periodic maintenanceof
machines , we extracted values for maintenance performanceindicators, we measured
their performance and correlation to evaluateits compatibility with global indicators.
The research aim to assess the current situation through the use ofquantitative
methods pattern which is used to access the values of theprevious mentioned performance
indicators and their interdependence tobe used in support of maintenance decisionsin the
container terminal later.
We noticed a strong inverse association between periodic maintenance TPMtime and
breakdown TBD, and reached a value rERS = -0.99, and thereforewe must focus on
increasing periodic maintenance to reduce breakdowntime, and replace parts that cause
recurringproblems which caused about intensive breakdowns, thus reducing
periodicmaintenance time.
Also we were able to classify the quality of maintenance and machinesthrough the
readiness and reliability indicators and the mean timebetween failures.
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