13 results on '"Ashour A"'
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2. TE surface waves in dielectric slab sandwiched between LHM slabs
- Author
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ASHOUR, Ass'
- Subjects
Physics::Optics ,TE surface waves,dispersion relation,left-handed metamaterial,power flow - Abstract
In this work, the dispersion relation for TE surface waves has been derived for a slab waveguide constructed from a dielectric material slab sandwiched between two thick layers of left-handed material (LHM). The dispersion relation and the power flow were numerically solved for a given set of parameters: the structural factor, dielectric slab thickness, and the operating frequency on the effective refractive index and power flow. We found that the wave effective refractive index decreases with thickness increase as well as increase in frequency. We found that the effective refractive index increases slightly with increase of structural factor. Also, the power flow increases with thickness and increases with operating frequency.
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- 2014
3. Physical Properties of Spray Pyrolysed CdS Thin Films
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ASHOUR, A.
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CdS thin films ,Spray pyrolysis ,Structural characteristics ,Electrical and optical properties - Abstract
Cadmium sulphide (CdS) thin films were prepared by chemical spray-pyrolysis technique. Cleaned glass substrates were used. The substrate temperature was varied in the range 200 -- 400 °C and seems to be one of the more important parameters affecting the physical properties of the semiconductor. The films were characterized by X-ray diffraction (XRD). XRD patterns indicated the presence of single-phase hexagonal CdS. The resistivity of the as-deposited films was found to vary in the range 103 - 105 W. Cm, depending on the substrate temperature. Direct band gap values of 2.39--2.42 eV were obtained from optical absorption measurements.
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- 2014
4. Monitoring the Effect of Recrystallization and Quenching in AlMgx Alloy by Pat
- Author
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ASHOUR, A.
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Isothermal and Isochronal annealing ,Deformation ,Grain size ,Quenching ,Recrystallization - Abstract
Positron annihilation technique (PAT) lifetime measurements have been carried out on AlMgx samples (x = 0.23, 0.85, 1.27 and 1.4 at %) with point defects and dislocations introduced by plastic deformation at room temperature. Clustering of vacancies was observed by quenching using PAT. The samples were annealed at 573 K for 12 hours to homogenize and divided into two sets. The first set of AlMgx (x = 0.23, 0.85 and 1.4 at %) was deformed to 10, 25 and 35% thickness reduction. Isochronal annealing was studied in the range of 300-550 K. In the second set of measurements, AlMgx (x = 1.27 Mg at %) was deformed to 31.25% thickknes reduction. Variation in the mean lifetime with annealing time (Isothermal annealing at 323 K) was studied. On the other hand, the effect of the degree of deformation on change of the value of the mean lifetime with different concentration of Mg was studied. This work is able to distinguish the state of sample with different concentration of impurities. The deformed samples reach the bulk state at higher temperature. Grain growth occurred with increasing temperatures as shown by lifetime value. The effect of quenching from various temperatures range (373-823 K) was studied.
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- 2014
5. Blood, Serum Glucose and Renal Parameters in Lead-Loaded Albino Rats and Treatment with Some Chelating Agents and Natural Oils
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Ashour, Abd El Rahiem A., Yassin, Maged M., Abu Aasi, Nahed M, and Ali, Rokaya M
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therapy ,kidney ,lead acetate ,natural oils ,blood ,albino rats ,chelating agents ,Lead acetate,blood,kidney,albino rats,therapy,chelating agents,natural oils - Abstract
This study investigated lead impact on blood, serum glucose and kidney function and the efficacy of treatment with chelating agents meso-2, 3-dimercaptosuccinic acid (DMSA), calcium disodium ethylenediaminetetraacetic acid (CaNa_2-EDTA) and natural olive and garlic oils to reduce lead toxicity in albino rats. Oral administration of 1000 or 2000 ppm lead acetate significantly decreased red blood cell count, hemoglobin level and hematocrit value at 20, 40 and 60 days compared with control groups (rats administered deionized water and 1000 or 2000 ppm sodium acetate). Serum glucose was also decreased significantly with both doses of lead acetate administration. In contrast, serum urea, uric acid and creatinine were significantly increased. Garlic or olive oils (1 ml/kg body weight/day, each) alleviated the previous changes in blood, serum glucose and renal parameters, whereas DMSA (50 mg/kg body weight/day) or CaNa_2-EDTA (100 mg/kg body weight/day) reversed such changes to near the control levels. Although chemical therapy is more efficient in reducing lead toxicity, natural products with their fewer side effects are still preferable.
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- 2014
6. Primary Finitely Compactly Packed Modules and S-Avoidance Theorem for Modules
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ASHOUR, Arwa Eid
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Condensed Matter::Soft Condensed Matter ,Primary submodules,primary compactly packed modules,primary finitely compactly packed modules,s-prime submodules,S-Avoidance Theorem for modules - Abstract
In this paper we introduce the concept of primary finitely compactly packed modules, which generalizes the concept of primary compactly packed modules. We first find the conditions that make the primary finitely compactly packed modules primary compactly packed. Also, several results on the primary finitely compactly packed modules are proved. In addition, the necessary and sufficient conditions for an R-module M to be primary finitely compactly packed are investigated. Finally, we introduce the S-Avoidance Theorem for modules.
- Published
- 2014
7. Prematüre retinopatisinde IGF-1 (İnsülin Benzeri Büyüme Faktörü), EPO ( Eritropoietin) ve VEGF (Vasküler Endoteliyal Büyüme Faktörü) seviyeleri ve risk faktörleri ile ilişkisi
- Author
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Ashour, Ahmed, Şahin, Özlem, Göz Hastalıkları Anabilim Dalı, and Yenice, Özlem
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Göz Hastalıkları ,Hastalıklar ,Eye Diseases ,Vascular endothelial growth factors ,Göz ,Erythropoietin ,Retinal diseases ,Retina ,Infant-premature ,Retinopathy of prematurity ,Insulin like growth factor I - Abstract
Amaç: PR hastalığının patogenezinde rol oynayan IGF?1, VEGF ve EPO seviyelerini tespit etmek, bu mediyatörlerin PR gelişimiyle ve diğer risk faktörleriyle olan ilişkisini incelemek.Gereç ve Yöntem: Prospektif olarak yapılan çalışmaya 32 gestasyonel haftanın altında veya doğum ağırlığı 2000 gramın altında olan 93 bebek dahil edilmiştir. Bebeklerden doğumda Eritropoietin, VEGF ve IGF?1 tesbiti için kordon kanı örnekleri alınıp -80OC'de saklandı. PR gelişimiyle ilişkili olduğu düşünülen demografik özellikleri (cinsiyet, doğum ağırlığı ve doğum haftası), prenatal risk faktörleri (prenatal steroid kullanımı ve çoğul gebelik) ve postnatal risk faktörleri (oksijen tedavisi ve süresi, %40 oksijen tedavisi ve süresi, mekanik ventilasyon tedavisi, sepsis, kan transfüzyonu, intraventriküler hemoraji, sürfaktan tedavisi, apne, anemi, hipoksi, hiperkapni, hipokapni ve asidoz) tespit edildi. Tüm bebeklere göz muayenesi yapılarak uluslararası ROP sınıflandırmasına göre sınıflandırıldı.Büyüme faktörlerinin seviyeleri (VEGF'i ELISA yöntemiyle, IGF-1 ve EPO kemilüminesans yöntemiyle İmmulite 2000 cihazı kullanılarak) tespit edilerek PR varlığı ve risk faktörleri ile ilişkisi araştırılmıştır.Bulgular: Çalışmamıza dahil edilen 93 prematüre bebekten 57 (%61.3)'sinde PR saptanmıştır. Çalışmamızda büyüme faktörlerinin ortanca serum değerleri; IGF-1 için 23.3 ng/ml (18,6 - 40 ng/ml), VEGF için 985.45 pg/ml (182.57 ? 2839.25 pg/ml) ve EPO için 6.07 mU/ml (2 - 90 mU /ml) olarak bulunmuştur. PR olan bebeklerde büyüme faktörlerinin ortanca serum değerleri IGF-1: 21.50±4.6 ng/ml, VEGF: 939,12±5.2 pg/ml ve EPO: 5.46±1.2 mU/ml olarak ölçülmüştür. PR gelişen ve PR gelişmeyen bebeklerin IGF-1, VEGF ve EPO düzeyleri ile karşılaştırdığımızda iki grup arasında anlamlı bir fark saptanmamıştır. Büyüme faktörlerin birbirleriyle karşılaştırdığımızda; IGF-1 ile VEGF ve EPO arasında anlamlı bir ilişki saptanmazken VEGF ve EPO arasında anlamlı bir korelasyon saptanmıştır (p=0.034, r= -0.25).Büyüme faktörleri ile risk faktörleri arasındaki ilişki incelendiğinde; istatistiksel olarak anlamlı bir korelasyon saptanmamıştır.Sonuç: Preterm bebeklerde kordon kanından alınan IGF-1, VEGF ve EPO değerleri ile prematüre retinopatisi gelişimi ve risk faktörleri arasında anlamlı bir ilişki bulunmamıştır. Objective: The objective of this study is to determine the levels of IGF-1, VEGF and EPO that play a role in the pathogenesis of PR disease and to examine their relationship with the development and risk factors of the disease.Materials and Methods: Prospectively made study was carried out on a 93 infants whoes gestational age was 32 weeks or had a birth weight less than 2000 gr. To determine the levels of EPO, VEGF and IGF-1, samples were collected from the cord and were reserved at -80OC. We identified in this study the demografik factors (sex, birth weight and gestational week), prenatal risk factors (prenatal steroid usage and multipartum) and the postnatal risk factors (O2 treatment and duration, 40% O2 treatment and duration, mechanic ventilation, sepsis, blood transfusion, intraventricular haemorrhage, surfactant adminstration, apnea, anemia, hypoxia, hypercabnia, hypocabnia and asidosis) that had a realtionship with the development of PR. All infants underwent ophthalmic examination and were classified according to the international ROP classification. The levels of growth factors (VEGF using ELİSA, IGF-1 and EPO using chemiluminescence method by immulite 2000 apparatus) and their relationship with the presence of the PR disease and with other factors was investigated.Results: 57 Of the 93 (61.3%) premature infants who were included in this study were found to have PR disease. The median serum levels of the growth factors were; IGF-1: 23.3 ng/ml (18.6 - 40 ng/ml), VEGF: 985.45 pg/ml (182.57 ? 2839.25 pg/ml) and EPO: 6.07 mU/ml (2 -90 mU/ml). The median serum levels of growth factors in infants with PR disease were measured and found to be as follows: IGF-1: 21.50±4.6 ng/ml, VEGF: 939.12±5.2 pg/ml and EPO: 5,46±1,2 mU/ml. The levels of IGF-1, VEGF and EPO were compared in both infants with and infants without PR disease and the results were insignificant. The growth factors were compared with respect to each other; while the comparison of IGF-1 with respect to VEGF and EPO was insignificant the correlation between VEGF and EPO was found to be valid (p=0.034, r= -0.25).The realtion between the growth factors and the risk factors was found to be statstically insignificant.Conclusion: In premature babies, there was not a significant relation between the development of retinopathy of prematurity and cord blood levels of IGF-1, VEGF and EPO, and risk factors. 72
- Published
- 2011
8. Arıtılmış atık sularının sulama olarak kullanılabilirliğinin araştırılması
- Author
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Ashour, Mohammed, Kumru, Mehmet Nurullah, and Ege Üniversitesi, Fen Bilimleri Enstitüsü
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Kot yıkama, atık su ,Çevre Bilimleri A.B.D - Abstract
Bu çalışma, Gül yıkama işletme örneğinde oluşan endüstriyel nitelikli atık suların özellikleri ile arıtma tesisinin projelendirilme durumu ve arıtma tesisinden çıkan arıtılmış atık suyun yapısı incelenmiştir. Bu amaçla kimyasal arıtma işleminden geçirilen yıkama işletmesi ,endüstriyel nitelikli atık suların , kanalizasyon deşarjı, kalite parametreleri yönünden, kanalizasyona deşarj uygunluğu , Su Kirliliği Kontrolü Yönetmenliği Teknik Usuller Tebliği ve ilgili literatürler ışığında irdelenmiştir.
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- 2004
9. Arıtılmış atık sularının sulama olarak kullanabilirliğinin araştırılması
- Author
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Ashour, Mohammad, Kumru, Mehmet Nurullah, and Çevre Bilimleri Anabilim Dalı
- Subjects
Environmental Engineering ,Çevre Mühendisliği - Abstract
ÖZET Arıtılmış Atık Sularının Sulama Olarak Kullanabilirliğinin Araştırılması ASHOUR, Mohammed Yüksek Lisans Tezi, Çevre Bilimleri Bölümü Tez Yöneticisi: Prof.Dr. Mehmet Nurullah KUMRU Aralık 2004, 57 sayfa Bu çalışma, Gül Yıkama İşletme örneğinde oluşan endüstriyel nitelikli atık suların özellikleri ile arıtma tesisinin projelendirilme durumu ve arıtma tesisinden çıkan arıtılmış atık suyun yapısı incelenmiştir. Bu amaçla kimyasal arıtma işleminden geçirilen yıkama işletmesi, endüstriyel nitelikli atık suların, kanalizasyon deşarjı, kalite parametreleri yönünden, kanalizasyona deşarj uygunluğu, Su Kirliliği Kontrolü Yönetmenliği Teknik Usuller Tebliği ve ilgili literatürler ışığında irdelenmiştir. ANAHTAR KELİMLERLER: Kot yıkama, Atık su VII ABSTRACT INVESTIGATION of The Reuse of Treated Wastewater For irrigation Ashour, Mohammed Msc in Environmental Science Supervisor: Prof. Dr. Mehmet Nurullah Kumru December 2004,...57..... pages In this thesis, the features of the industrially qualified wastewater that examplified in the sample of Gül Washing Factory and state of being aproject of the treatment and from the treated wastewater were examined. For this aim the washing institution that was passed throuh the operation of chemical treatment, the decharge of the canalization of the industrially qualified wastewater, the decharge suitability to canalization as for the quality parameters were examined in the light of Technical Ways Annoucement of Wastewater Control Regulation and related works. Keywords: Washing denim, Wastewater 71
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- 2004
10. Prematüre Retinopatisi Etyopatogenezinde Serum Eritropoetin, İnsülin Benzeri Büyüme Faktörü 1 ve Vasküler Endotelyel Büyüme Faktörü.
- Author
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Yenice, Özlem, Ashour, Ahmed, Çerman, Eren, Fırat, Rıdvan, Haklar, Goncagül, Şirikçi, Önder, Akman, İpek, and Kazokoğlu, Haluk
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ERYTHROPOIETIN , *SOMATOMEDIN C , *VASCULAR endothelial growth factors , *SERUM , *RETROLENTAL fibroplasia , *INFANT health , *CYTOKINES - Abstract
Purpose: The aim of this study was to determine the serum levels of erythropoietin (EPO), vascular endothelial growth factor (VEGF) and insulin-like growth factor-1 (IGF-1) that possibly play an important role in the pathogenesis of retinopathy of prematurity (ROP) and to investigate their relationship with each other. Material and Method: In this study, 93 infants with gestational age of less than 32 weeks or had a birth weight of less than 2000 g were investigated prospectively. To determine levels of EPO, VEGF and IGF-1, samples were collected from cord blood and were reserved at -80°C. Serum levels of cytokines in babies with and without ROP (ROP+ and ROP-) were determined and their relationship with each other was investigated. Results: ROP was found in 57 (61.3%) babies. There was a significant difference between ROP- and ROP+ groups for birth weight (1678.06±326.03 g; 1383.95±343.23 g; p=0,001) and birth week (29.65±2.34 weeks; 32.22±1.49 weeks; p=0,001) correspondingly. Besides, IGF-1 levels correlated significantly with birth weight (r=0.509; p=0.001) and birth week (r=0.586, p=0.001). Median serum levels in ROP(-) group were 19.45 ng/ml (0-40 ng/ml) for IGF-1, 1159.5 pg/ml (396.59-2389.25 pg/ml) for VEGF, and 6.14 mU/ml (2.6-35.4 mU/ml) for EPO. The median serum levels in ROP+ group were 0 ng/ml (0-30.6 ng/ml) for IGF-1, 864.98 pg/ml (182.57-2133.05 pg/ml) for VEGF, and 6.07 mU/ml (2.4-90.2 mU/ml) for EPO. Levels of IGF-1 (p=0.008) and VEGF (p=0.011) were significantly lower in the ROP(+) group. Serum VEGF correlated with EPO levels (r=0.275; p=0.019). Discussion: Serum IGF-1 and VEGF levels at birth may be measured to assess the risk for developing ROP. [ABSTRACT FROM AUTHOR]
- Published
- 2012
- Full Text
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11. Dağlardaki bağlantı problemlerinin işbirlikçi oyun teorisi ile çözümü= Solving connection problems in mountains by cooperative game theory
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Alzaki, Hamid Farhan Ashour, 1963- author 146552, Süleyman Demirel Üniversitesi. Fen Bilimleri Enstitüsü. Matematik Anabilim Dalı. issuing body 10117, and Alparslan Gök, Sırma Zeynep. thesis advisor 71482
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Süleyman Demirel Üniversitesi - Abstract
Bu tez beş kısımdan oluşmaktadır. İlk kısımda oyun teorisi ile ilgili özet, tarihsel bakış ve Shapley değeri ile ilgili bilgi verilmiştir. Ayrıca, bağlantı durumundan çalışılmıştır. İkinci bölümde dağlardaki bağlantı durumları açıklanmış ve ağırlıklı bir çizgeden minimum bağlantılı bir ağaç oluşturulması çalışılmıştır. Üçüncü kısımda işbirlikçi oyunlara uygulamalardan bahsedilmiş ve Shapley değeri hesaplanmıştır. Dördüncü kısımda, Atatürk stadyumuna Isparta'nın belli bölgelerinin bağlanması gösterilmiştir. Son kısımda, çalışmanın sonuçları ve bazı öneriler verilmiştir., This thesis consists of five chapters. In the first chapter, a summary of game theory, historical overview and information of the Shapley value is given. Also connection situations related to game theory, the aim of the thesis is studied. In the second chapter, we explain the connection problems in mountains and study how to find the minimum cost-spanning tree for directed weight of graph. In chapter 3, applications in cooperative games are given and the Shapley value is calculated. In the fourth chapter, we link the main areas in the city of Isparta with the Atatürk stadium. In the last chapter, the conclusion of the study and some suggestions are given., Tez (Yüksek Lisans) - Süleyman Demirel Üniversitesi, Fen Bilimleri Enstitüsü, Matematik Anabilim Dalı, 2016., Kaynakça var.
12. İşbirlikçi gri yöneylem araştırma oyunları = Investigating of early universe through equation of state of quark gluon plasma
- Author
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Alzaki, Hamid Farhan Ashour, 1963- author 146552, Faisel, Gaber. 169793 thesis advisor, and Süleyman Demirel Üniversitesi. Fen Bilimleri Enstitüsü. Fizik Anabilim Dalı. 9075 issuing body
- Subjects
Süleyman Demirel Üniversitesi - Abstract
Bu tezde bazı termodinamik parametrelerin evrenin erken bir döneminde değişimleri incelenmiştir. Bahsi edilen dönemde evren kuvark-gluon plazması adı verilen sıvı formda bir maddeyle dolu idi. Çalışılan termodinamik parametreler enerji yoğunluğu, basınç yoğunluğu ve entropi yoğunluğudur. Bu parametrelerin zamanla değişimleri, Genel Görelilik’in bir denklemi olan ve enerji yoğunluğuna bağlı olarak yazılabilen Friedmann diferansiyel denklemi analitik olarak çözülerek elde edilebilmektedir. Bu tez çalışmasında Friedmann denklemine bag model yaklaşımı çerçevesinde analitik çözümler elde edilmiştir. Ayrıca, basınç yoğunluğu ve entropi yoğunluğu için analitik çözümler sunulmuştur. Analitik çözümler temel alınarak ilgili termodinamik parametrelerin zamana bağlı değişimlerini gösteren grafikler ve davranışları üzerine tartışmalar sunulmuştur. Bu tartışmaların evrenin o erken evresine ışık tutacağını düşünmekteyiz. Anahtar Kelimeler: kuvark-gluon plazması, Friedmann diferansiyel denklemi, erken evresi., In this thesis we study the evolution of thermodynamics parameters in an epoch of the early universe. The universe in that epoch was filled by a fluid of quark gluon plasma.The thermodynamics parameters we study are the energy density, pressure density and entropy density. The time evolution of these parameters can be obtained upon solving Friedmann differential equations of the energy density, of the general relativity. In this thesis we provide analytic solutions for the Friedmann differential equation in the framework of the bag models. In addition, we present the results of the analytic solutions for pressure density and entropy density. Based on the analytic solutions, we present the plot of the time evolutions of these thermodynamics parameters and a discussion about their behavior will be provided. This will shed light on that epoch of the early universe. Keywords: Quark-gluon plasma, Friedmann differential equations, early universe, Tez (Doktora-PhD) - Süleyman Demirel Üniversitesi, Fen Bilimleri Enstitüsü, Fizik Anabilim Dalı, 2020., Kaynakça var.
13. STATIC ANALYSES OF THE EFFECT OF DEEP EXCAVATION ON THE BEHAVIOUR OF AN ADJACENT PILE IN SAND
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Yeşim S. Ünsever and Sameh Ashour
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derin kazı ,tekil kazık ,kum zemin ,sonlu elemanlar yöntemi ,deep excavation ,single pile ,finite element method ,sand ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
The influence of deep excavation on adjacent pile behaviour is an important issue to ensure its serviceability and stability. In this paper, the effect of deep excavation on an adjacent loaded single pile in saturated cohesionless soil was investigated by 3D finite element method. After verification of finite element model using centrifuge test results found in literature, a parametric study was conducted by varying the most influence factors on the pile behaviour such as excavation depth, distance from the pile to the excavation and pile head type. It was concluded that the excavation depth (He) with respect to pile length (Lp) has a significant effect on pile response. Among the three cases of He/Lp, the case of He/Lp=0.5 induced the maximum bending moment while the case of He/Lp= 1.5 induced the maximum pile lateral deflection. Moreover, the distance from the pile to the excavation site has also a significant influence on pile response and the induced bending moment in pile is inconsiderable after 9 m distance. Also, it is observed that the pile head type has an important effect on the pile behaviour especially in case of rigid head case.
- Published
- 2022
- Full Text
- View/download PDF
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