Qatar University Institutional Repository: Recent submissions
Now showing items 401-420 of 28761
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A focused review of the hydrogen storage tank embrittlement mechanism process
( Elsevier , 2023 , Article Review)Hydrogen embrittlement is a widely known phenomenon in high-strength and storage materials. Hydrogen embrittlement is responsible for subcritical crack growth in material, fracture initiation, subsequent loss in mechanical ... -
Non-covalent functionalization of surfactant-assisted graphene oxide with silver nanocomposites for highly efficient photocatalysis and anti-biofilm applications
( Elsevier , 2024 , Article)This study presents a comprehensive investigation on the synthesis and characterization of surfactant-assisted graphene oxide non-covalent functionalized silver nanocomposites (rGS-AgNPs) for achieving remarkable photocatalytic ... -
Environmental factors affecting the corrosion behaviour of reinforcing steel. VI. Benzotriazole and its derivatives as corrosion inhibitors of steel
( Elsevier , 2014 , Article)Benzotriazole and some of its derivatives cause inhibition of corrosion of reinforcing steel in saturated naturally aerated Ca(OH)2 solutions contaminated by Cl−. The inhibition efficiency of these compounds depends on ... -
Electrochemical Investigation of C-Steel Corrosion Inhibition, In Silico, and Sulfate-Reducing Bacteria Investigations Using Pyrazole Derivatives
( American Chemical Society , 2023 , Article)The inhibitory impact of the two synthesized pyrazole derivatives (3 and 4) toward metallic and microbial corrosion was investigated. Using open circuit potential, potentiodynamic polarization, and electrochemical impedance ... -
Failure analysis of 316L air cooler stainless steel tube in a natural gas production field
( Elsevier , 2015 , Article)In spite of the excellent resistance of stainless steel (SS) towards uniform corrosion, overcoming various localized corrosion could be a real challenge. This work presents an analysis of the failure behavior of 316L SS ... -
هُويَّة الذات الافتراضية وعلاقتها بتقدير الذات لدى طلاب الجامعةِ في ظل جائحةِ كورونا
( Qatar University Press , 2024 , Article)هدفت الدراسةُ إلى التحقُّق من البنية والمصداقية لمقياس هوية الذات الافتراضية في علاقتها بتقدير الذات لدى طلاب الجامعة في ظل جائحة كورونا في المجتمع العربي. اختيرت عينة متاحةٌ للدراسة، وتكونت من 243 طالبًا وطالبة من طلاب ... -
مستوى مشاركة أولياء أمور التلاميذ ذوي الإعاقةِ العقلية في إعداد البرنامج التربوي الفردي في المملكةِ العربية السعودية - دراسةٌ نوعية
( Qatar University Press , 2024 , Article)هدفت هذه الدراسةُ إلى التحقُّق من مستوى مشاركة أولياء أمور التلاميذ ذوي الإعاقة العقلية في البرنامج التربوي الفردي، ومعوقات هذه الشراكة. طَبَّقت هذه الدراسة المنهج الوصفيَّ النوعيَّ الذي يساعد الباحث في الوصول إلى مشكلة ... -
تصوُّراتُ المعلمين حول كفاءتِهم الذاتيةِ في التَّعليم عن بُعدٍ وعلاقتُها بممارساتِهم التدريسية في الفصولِ الافتراضية بسَلطنةِ عُمان
( Qatar University Press , 2024 , Article)هدفت الدراسةُ إلى التعرُّف على تصورات المعلمين حول كفاءتهم الذاتية في التعليم عن بعد، وعلاقتها بممارساتهم التدريسية في الفصول الافتراضية. ولتحقيق أهداف الدراسة أعدَّ الباحثون مقياسًا لتصورات المعلمين، وبطاقة ملاحظة للممارسات ... -
الكفاياتُ اللازمة في تكنولوجيا المعلومات والاتصالات لمعلم مراحلِ التعليمِ العام بمدارس دَولةِ قطر من وجهةِ نظر معلِّمِ الحاسوب
( Qatar University Press , 2024 , Article)هدفت الدراسةُ الاستطلاعية إلى التعرُّف على أهم الكفايات اللازمة في تكنولوجيا المعلومات والاتصالات ICT التي يجب أن تتوفر لدى معلم مراحل التعليم العام بمدارس دولة قطر من وجهة نظر معلمي الحاسوب بهذه المراحل، وعلى أثر المتغيرات ... -
Can dynamic pricing make femto users and service providers happy?
( IEEE Computer Society , 2013 , Conference Paper)Femtocell is a promising technology that will improve wireless resources efficiency through frequency spatial reuse however, its integration with the current cellular systems has been considered a fundamental challenge. ... -
Power consumption in spatial cognition
( wiley , 2013 , Article)Multiple input multiple output adds a new dimension to be exploited in cognitive radio by simultaneously serving several users. The spatial domain that is added through multiple input multiple output is another system ... -
Enhanced service delivery for cognitive systems within multiple antenna scenarios
( IEEE Computer Society , 2013 , Conference Paper)Multiple Input Multiple Output (MIMO) is a well established technology that when jointly considered with Cognitive Radio (CR) it will create interactions that need to be optimized. The capability to provide service to more ... -
A novel energy saving MIMO mechanism in LTE systems
( Institute of Electrical and Electronics Engineers Inc. , 2013 , Conference Paper)Long Term Evolution (LTE) supports closed-loop MIMO techniques to improve its performance, but in order to exploit multiuser MIMO channel capabilities, the design of an efficient MAC scheme that supports Multiuser MIMO is ... -
Energy optimization in multiuser quantized feedback systems
( Springer Nature , 2013 , Article)This article explores the effects of quantization of feedback information on energy consumption in multiuser wireless communication systems. In order to optimize the energy consumption of the system, the article concentrates ... -
Energy optimization in unsynchronized TDD systems for joint uplink downlink scheduling
( IEEE , 2013 , Conference Paper)Energy is an important resource in wireless communications systems that has to be optimized in order to guarantee low interference in the network as well as efficient use of the available resources. One of the prominent ... -
Energy efficient techniques for 802.11n multiuser MAC WLANs
( Institute of Electrical and Electronics Engineers Inc. , 2013 , Conference Paper)In this paper we evaluate the energy efficiency of MIMO technologies introduced in the emerging IEEE 802.11n standard for infrastructure based WLANs. The main focus is on exploiting multiuser capabilities of MIMO technologies, ... -
Quality of experience for spatial cognitive systems within multiple antenna scenarios
( IEEE , 2013 , Article)Multiple Input Multiple Output (MIMO) adds a new dimension, the spatial one, to be optimized in Cognitive Radio (CR) by offering service simultaneously to more than one user. In this paper, statistical optimization techniques ... -
Grassmannian beamforming for Coordinated Multipoint transmission in multicell systems
( IEEE Computer Society , 2013 , Conference Paper)Wireless communications suffer from the problem of interference, where undesired signals reach the destination and cause its performance to degrade. Several mechanisms have been proposed over the last years to mitigate the ... -
Opportunistic bi-directional scheduling under quality of experience demands
( Association for Computing Machinery , 2013 , Conference Paper)Quality of Experience (QoE) is a very important metric in wireless communication systems, where customers request strict QoE demands that translate into restrictions on both Uplink (UL) and Downlink (DL) connections. The ... -
Green handover with a hybrid satisfaction mechanism
( IEEE Computer Society , 2013 , Conference Paper)Green communications have emerged as one of the most important trends in wireless communications because of its several advantages of interference reduction, battery life increase and electrical bill cut. Its application ...