NaylaMunawar, Ahmed Elsir Ahmed Ali, Fathy M Hassan, Yaser Greish

كلية العلوم-جامعة الإمارات العربية المتحدة · الامارات

This thesis presents the work done developing nanotechnology-based compositions contributing to the advancement of two main sectors: Water and Energy. For they present vital impact and correspondence for sustainability and development worldwide. Composites constituted following the most recent trends in material science and nanotechnology while revolving around Manganese Oxide as the material of investigation. Water security is one of the most important challenges in our current times. Moreover, reports warn of the predicted restricted access to clean water by 2050, which is expected to impact more than half the population. Thus, many scientists and societies are exerting efforts to develop a sustainable and feasible solution. Modules of atmospheric water harvesting-based technology are sought as a promising answer. The attractiveness lies in the feasibility and low cost through a variety of materials. In our work, we aim to boost the collection of aluminum-based mesh. Natural creatures inspire us, adopting flowerlike sempervivum plants and constructing an architecture surface of alternating hydrophilic-hydrophobic chemistry referencing desert beetles (Stenocara gracilipes). Our composition illustrates a flowerlike morphology from nanostructured manganese oxide, tunable through a polymer linker; Polyacrylonitrile. Controlling the surface properties, our composed Nanoflake/ Nanoflower (NF-MnO2)/ PAN nanostructure paradigm advances the droplets to drop growth and release process with a collection efficiency estimate between 26 and 45 L/m 2 per Hour. In the second part of this thesis, paving for a composition facilitating the rise in energy demand. Our extended efforts investigated materials applicable to supercapacitors (SC) type of energy storage devices. Supercapacitor’s attractive fundamentals value high energy and power factors. Our hybrid Supercapacitor (SC) joins the efficient electric double-layer capacitor’s (EDLC) fast charge and discharge of electrons and ions, on an increased surface area, with the pseudo-capacitance faradic current attributed to the redox reactions corresponding to the metal oxides composed. A composite material has been investigated, developed, and improved to bridge the gap between theoretical values and experimental outcomes by the insertion of carbon-based materials for better conductivity, supported by carbon nanotubes to modify their properties, increasing the stability with polymeric binders for easier proton transport and ionic migration. In our paradigm, a variety of manganese oxides with different morphologies and phases/ structures have been investigated for hybrid nanostructures with modified properties. Our resultant composite had successfully exerted very high specific capacitance in a cell of high eco-chemical stability with electrochemical capacitive retention where the specific capacitance of the composite reached 1456 F/g at 2 mV/s in cyclic voltammetry measurement and had a high retention profile above 95% after 11000 cycles during GCD at 1 A/g in an environmentally eco-friendly cell system suitable for industrial scale-up.

حمودي بيشة, شيشون بوعزيز

كلية العلوم الاقتصادية والتجارية وعلوم التسيير-جامعة محمد خيضر - بسكرة · الجزائر

الطاهر بعداش, أحمد رجراج

كلية العلوم الاقتصادية والعلوم التجارية وعلوم التسيير-جامعة الجزائر 3 - إبراهيم سلطان شيبوط · الجزائر

تتمتع البنوك التجارية بميل طبيعي للاستثمار بأموال الغير، والقيام بمعاملات مالية متغيرة بشكل مطرد تحيط بها الكثير من المخاطر تهدد استقرارها وأمانها مما يدفع بالبنوك المركزية القيام بواجبها الرقابي والإشرافي بشكل مستمر. إن الرقابة على الصناعة المالية والإشراف عليها تعتبر من أهم القضايا. فالمحافظة على الاستقرار العام وحفظ حقوق المودعين، وتحسين الثقة في نظام الوساطة المالية يتطلب الاهتمام بالمعايير الرقابية والإشرافية. وقيام البنوك المركزية بتحديث وتطوير الأساليب والأدوات الرقابية بالاعتماد على ابتكارات الهندسة المالية الكيفية والنوعية. ونظرا لتنامي أهمية الدور الذي تلعبه الابتكارات المالية في إدارة المخاطر جاء هذا الموضوع ليبرز امكانية استخدام بعض تقنيات الهندسة المالية المستخدمة في إدارة المخاطر واستخدامها من قبل بنك الجزائر كنماذج وأساليب قياس وتنبؤ بحجم ومستويات المخاطر التي تتعرض لها البنوك التجارية العاملة في السوق المصرفية الجزائرية، كما يهدف إلى محاولة ايجاد البيئة المناسبة والقاعدة الأساسية لعمل الأدوات المبتكرة في الإطار الرقابي لتكون هاته العملية فعالة إلى أبعد الحدود.

ميرا حيدر, وسام غياد

كلية الحقوق والعلوم السياسية والإدارية-الجامعة اللبنانية · لبنان

Khulood Abdulrazzaq Khaleel, Wijdan N Al Mousawi

كلية الطب-جامعة البصرة · العراق

A case-control study has been carried out on autistic spectrum disorder patients who have been registered at Ausraty Center and other children who have been diagnosed by psychiatrist and pediatric doctors in Basrah, southern Iraq during the period from December 2018 to October 2019. A total of 194 children were enrolled in this study, 94 were patients with ASD and 100 were apparently healthy individuals, as control group, matched with patients' age and sex (2 -13 years).This study was conducted to detect, the plasma levels of Transforming growth factor-Beta-1 TGFβ-1, Interferon Gamma (IFN-γ) and Anti Myelin Basic Protein (AMBP) by Enzyme Linked Immuno-sorbent Assay (ELISA) technique, the frequency of alleles and genotypes of gene polymorphism of TGFβ-1 and IFN-γconventional Polymerase Chain Reaction (PCR) with special sets of primers, the percentage of CD4, CD8,and CD25 marker within 48 hours by using flow cytometry technique and lastly frequency of Human Herepes Virus -6 type A and B (HHV-6A,HHV-6B)infection by Real time polymerase chain reaction qPCR. The study revealed that autistic spectrum disorder patients have lower concentration of TGFβ-1(95.91ng/ml±6.37) than control group (117.08 ng/ml ±7.58). This difference was statistically significantly, While IFN-γ and AMBP reported a significantly higher concentration in ASD patients (24.87 pg/ml±2.003,28.14 pg/ml ±1.77) than control group (18.86 pg/ml ±1.38,16.05 pg/ml ±0.95). Regarding the results of Single Nucleotide polymorphism (SNP) a statistically significant difference was resulted in the frequency of TGF-1gene polymorphism in both position (condon 10 and codon 25); in codon 25 G/C alleles, the frequency of C allele was more in the autistic patients than control while in codon 10 The frequency of T allele significantly higher in autistic group than the control. In this study there is a moral significance repetition result of TC genotype in TGF-β1 gene polymorphisms codon 10 +860 T/Cin ASD patients compared with control samples. Interestingly, the TC, allele have been associated with higher TGF-β1plasma level so the study found a significant correlation between the plasma level of (TGF-β1) and the TC genotype of Codon 10 in ASD group which was (79.0) in compared to the control group (55.0). Another crucial SNP locus is codon 25G/C which may impact the production of TGF-β1,the study found that the CC genotype significantly higher in ASD patients than the control group and the frequency of allele C at TGFβ-1codon 25 was significantly higher in patients with ASD than in healthy control. Concerning IFN-γ+874 T/A gene polymorphism the findings showed there was a significance differences in the frequency of T allele in the autistic (23.4 %) and control group (67 %), p value < 0.05 ,and AA genotype has been related to higher plasma protein level of IFN-γ, compared with the TA genotype which relation to lower plasma protein level of IFN-γ, while the homozygous (TT) genotype has been characterized by intermediate levels. Flow cytometry based assays for cell counting showed that patients with autistic spectrum disorder had decreased counts of CD4, CD8 and CD25 than control group which scored mean (25.47 vs 28.37 , 27.42 vs 30.47 and 3.91 vs 4.91) respectively, indicated significant differences undergo P value <0.05. The distribution of HH6 A virus in case and control groups were showed no significance variation in the percentage of HH6A positive among autistic and the control groups ( P >0.05), while HHV-6 B were detected in (35.1%) of autistic patients versus (2%) of control children and statistically the difference was significant (P value < 0.038).From the results of the current study, it can be concluded that the plasma levels of TGF-β1,INF-γ, AMBP and gene polymorphsim of TGF-β1 and IFN-γ has been associated the ASD. A much larger number of patients need to be screened for HHV-6 genotype B infection and to outline the clinical determinants of this complication and assess any possible association with other biological factors, including the levels of TGF-β1,INF-γ, AMBP and counts of CD4,CD8 and CD25.The present study was clarified a positive correlation between the presence of viral infection (HHV-6B) and the plasma protein level of TGFβ-1 in ASD patients.

Zuhair Mattoug Gasem, محمد فيضان

كلية الهندسة-جامعة الملك فهد للبترول والمعادن · السعودية

The effectiveness of corrosion prevention of steel rebar embedded in concrete structure hinges on its passivation tendency and the ability to which it could be stable when exposed to chloride and carbonation. This study investigated the effects of isothermal (at 650, 570, 500, 450, and 400 °C) and quench and tempered (Q&T at 300 and 400 °C) heat treatments on the corrosion resistance of steel rebar immersed in simulated cement pore solution (CPS) with and without chloride addition. Electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR), and potentiodynamic polarization (PDP) techniques were utilized to assess the electrochemical characteristics. The composition of the oxide film was analyzed using X-ray photoelectron spectroscopy (XPS).The results of various electrochemical techniques indicated that Q&T rebar samples exhibited higher corrosion resistance compared to rebar samples isothermally heat-treated in both chloride-free and chloride-containing CPS. EIS results in CPS containing chloride revealed that the Q&T 400°C rebar provided 7.2 times higher film resistance (Rf) and 2.3 times higher charge transfer resistance (Rct) compared to the corresponding values of Rf and Rct noted for the isothermally heat-treated rebar at 400°C. In the presence of chloride, the estimated film thickness (δf) of 2.5 nm was calculated for the Q&T 400°C rebar, and 0.8 nm was calculated for the isothermal treated rebar at 400°C. In chloride, the rebar sample Q&T at 400°C showed slightly higher uniform corrosion resistance but marked enhanced pitting potential as compared to the sample Q&T at 300°C.XPS analysis of selected samples revealed that the composition ratio Fe2+/Fe3+ in the naturally formed passive film varied with the substrate microstructure and correlated well with the rebar’s passivation performance. For instance, spontaneously formed passive film on Q&T 400°C rebar was found to be highly protective and the quantitative analysis of the passive film composition showed a higher ratio of Fe2+/Fe3+ (2.57) with approximately 72% FeO/Fe3O4 (Fe2+) and 28% Fe2O3/FeOOH (Fe3+). On the contrary, the lowest Fe2+/Fe3+ ratio (1.65) was exhibited by the 400°C-isothermally heat-treated rebar with approximately 62% FeO/Fe3O4 (Fe2+) and 38% Fe2O3/FeOOH (Fe3+). The second part of the study investigated calcium nitrate Ca(NO3)2 as a potential inhibitor for the corrosion of rebar in chloride-containing environments. The inhibition effect was investigated on the electrochemical performance of heat-treated rebar samples in CPS containing 2 and 4 wt.% calcium nitrate with the presence of chloride. Electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR), and potentiodynamic polarization (PDP) techniques were utilized to assess the electrochemical characteristics. The electrochemical results revealed that NO3− ions effectively inhibited rebar corrosion in the presence of chloride ions by suppressing localized corrosion in the form of pitting. Consequently, the charge transfer resistance (Rct) was observed to be dominating in the presence of calcium nitrate inhibitors. Rct enhanced 4.5 times for Q&T 400°C rebar sample in CPS solution containing 2 wt.% calcium nitrate inhibitor compared to the rebar exposed to CPS with 0 wt.% calcium nitrate. The effective corrosion inhibition efficiency of 78% was achieved based on Rct for the Q&T 400°C rebar sample in the presence of 2 wt.% calcium nitrate in CPS. The inhibition mechanism was more dominant in cathodic region as a cathodic shift was seen in PDP curves. Adsorption of nitrate ions was evident from AFM and FTIR spectra, which provided a barrier layer and possibly restricted the accessibility of Cl- diffusion to the metal-film interface. The highest film thickness (δf) of 2.25 nm was estimated for the Q&T 400°C rebar in comparison to 0.5 nm calculated for Q&T 300°C rebar.

حسين دحدوح, ربا إبراهيم عيسى قنديل

كلية الأعمال-جامعة جدارا · الاردن

بادية يوسف حيدر, محمود سعيد

كلية الهندسة المدنية-جامعة تشرين · سوريا

صافة الطيب, ميمونة داودي

كلية الحقوق والعلوم السياسية-جامعة ابن خلدون – تيارت · الجزائر

إن علاقة الصفقات العمومية والبيئية هي علاقة تعايش حتمي، فمن جهة الإدارة العمومية لا يمكنها الاستغناء عن الصفقات العمومية التي هي أحد الوسائل القانونية، لتحقيق وتلبية حاجاتها وتسيير المرفق العام ، ومن جهة أخرى فالدولة والجماعات المحلية والتي يقع على عاتقها قانونا مسؤولية حماية البيئة طبقا للتشريع الساري المفعول وتسهل على تحسين نوعية البيئة وشروط النظافة لفائدة المواطن، وهو ما يؤدي إلى المحافظة على صحة المجتمع عامة.

نور الدين أحميدة, يحيى ونوقي, يوسف العوين

معهد علوم وتقنيات النشاطات البدنية والرياضية-جامعة زيان عاشور - الجلفة · الجزائر

عنوان الدراسة: " دور التنشئة الاجتماعية في قبول ممارسة النشاط البدني الرياضي التربوي لإناث الطور الثانوي "دراسة ميدانية على ثانويات دائرة امجدل –مسيلة-مشكلة الدراسة: إلى أي مدى تقوم التنشئة الاجتماعية في قبول ممارسة النشاط البدني الرياضي التربوي لإناث الطور الثانوي؟فرضيات الدراسة:الفرضية العامة: للتنشئة الاجتماعية دور في قبول ممارسة النشاط البدني الرياضي التربوي لإناث الطور الثانوي.الفرضيات الجزئية:-للأسرة دور في قبول ممارسة النشاط البدني الرياضي التربوي لإناث الطور الثانوي.-للمؤسسات التعليمية (الأستاذ) دور في قبول ممارسة النشاط البدني الرياضي التربوي لإناث الطور الثانوي.-للإعلام دور في قبول ممارسة النشاط البدني الرياضي التربوي لإناث الطور الثانوي.هدف الدراسة: تهدف دراستنا الحالية إلى الكشف عن الدور الذي تلعبه التنشئة الاجتماعية قبول ممارسة النشاط البدني الرياضي التربوي لإناث الطور الثانوي.إجراءات الدراسة الميدانية: تمثلت عينة الدراسة في 30 تلميذ (إناث) وللوصول إلى نتائج دقيقة اتبعنا المنهج المناسب في هذه الدراسة وهو المنهج الوصفي ،أما بالنسبة للمجال المكاني فكان على مستوى ثانويات دائرة امجدل –مسيلة- وبالنسبة للمجال الزماني بدأت دراستنا انطلاقا من شهر جانفي إلى غاية أفريل 2017الأدوات المستخدمة في الدراسة :تمثلت أدوات جمع البيانات في الاستبيان الذي وزع على أفراد العينةأهم النتائج المتوصل إليها: إن التنشئة الاجتماعية دفعت بالتلاميذ الاناث لممارسة النشاط البدني الرياضي التربوي في الطور الثانوي.اقتراحات: -اهتمام مؤسسات التنشئة الاجتماعية بتكوين وتوجيه الأطفال تكوينا سليما وفق المعايير والعادات والتقاليد التي تضبط المجتمع-توعية الإناث بأهمية ممارسة النشاط الرياضي والدور الذي تلعبه الرياضة في بناء شخصية سليمة متكاملةاستخلاص:يمكن استخلاص أن للتنشئة الاجتماعية دور هام في قبول ممارسة النشاط البدني الرياضي التربوي، وذلك من خلال أساليبها المنتهجة من طرف مؤسساتها ونخص بالذكر كلا من الأسرة، المدرسة وبالأخص الأستاذ وأيضا الإعلام.