Search
Now showing items 8641-8650 of 8943
Forced vibration characteristics of embedded graphene oxide powder reinforced metal foam nanocomposite plate in thermal environment
(
Elsevier
, 2021 , Article)
Dynamic behavior of a new class of nanocomposites consisted of metal foam as matrix and graphene oxide powders as reinforcement is presented in this study in the framework of forced vibration. Graphene oxide powders are ...
Academic self-concept and its relationship to academic achievement among university students.
(2022 , Article)
This research sought to study the academic self-concept and the relationship between the academic self-concept and students’ academic achievement among university Qatari students. Research of the academic self-concept is ...
Qatar Defense Strategies
(
Gulf Studies center - College of Arts & Sciences - Qatar University
, 2021 , Conference Paper)
Security become a crucial subject in the Arab world and Gulf region, particularly is that the security concept now include different aspects represent in social, cyber, economic and health security. So, the security of the ...
Cybersecurity of multi-cloud healthcare systems: A hierarchical deep learning approach
(
Elsevier Ltd
, 2022 , Article)
With the increase in sophistication and connectedness of the healthcare networks, their attack surfaces and vulnerabilities increase significantly. Malicious agents threaten patients’ health and life by stealing or altering ...
Microstructure and mechanical behavior of hot extruded aluminum/tin-bismuth composites produced by powder metallurgy
(
MDPI AG
, 2020 , Article)
In this study, Al-BiSn composites were synthesized by a combination of microwave sintering and hot extrusion processes. The structural, morphological, mechanical, and thermal properties were investigated to elucidate the ...
Combined direct oxy-combustion and concentrated solar supercritical carbon dioxide power system—Thermo, exergoeconomic, and quadruple optimization analyses
(
Hindawi
, 2022 , Article)
For the global future energy systems, concentrated solar power (CSP) and direct CO2 capture systems are of the most important key technologies, however, each of these systems has shortcomings. This study addresses the solar ...
Building a Local Sport Identity: The World Cup and its implications on community sports in Qatar and Saudi Arabia
(
Gulf Studies center - College of Arts & Sciences - Qatar University
, 2022 , Conference Paper)
The FIFA World Cup 2022 in Qatar has resulted in more engagement in Qatar to promote local and domestic sport on different levels. Driven by the overarching goal to enhance and improve physical activities among the Qatari ...
A hybrid piezoelectric-electromagnetic energy harvester from vortex-induced vibrations in fluid-flow; the influence of boundary condition in tuning the harvester
(
Elsevier
, 2022 , Article)
In this paper, a hybrid piezoelectric-electromagnetic energy harvester is proposed to harvest energy from fluid flow around a bluff-body using vortex-induced vibration (VIV). The hybrid piezoelectric-electromagnetic harvester ...
Adaptive Electromagnetic Vibration Absorber for a Multimode Structure
(
Assoc. of Mechanical Eng. and Technicians of Slovenia
, 2022 , Article)
All structures experience vibrations due to external dynamic force excitations, such as earthquakes and wind loadings. At resonance, the impact of this natural dynamic force on structures may lead to structural failures. ...
Magnetorheological elastomer-based variable stiffness flexible coupling for vibration isolation
(
Canadian Science Publishing
, 2021 , Article)
Rotating mechanical equipment such as pumps and motors can suffer from unattenuated torsional vibration. The causes of such vibration range from imbalance within the rotating system to misalignment, or even operating at ...