Tafila Technical University

About: Tafila Technical University is a education organization based out in Aţ Ţafīlah, Jordan. It is known for research contribution in the topics: Computer science & Adsorption. The organization has 350 authors who have published 806 publications receiving 7567 citations. The organization is also known as: tafila technical university & tafila university.

Unmanned Aerial Vehicles: A Survey on Civil Applications and Key Research Challenges

Abstract: The use of unmanned aerial vehicles (UAVs) is growing rapidly across many civil application domains, including real-time monitoring, providing wireless coverage, remote sensing, search and rescue, delivery of goods, security and surveillance, precision agriculture, and civil infrastructure inspection. Smart UAVs are the next big revolution in the UAV technology promising to provide new opportunities in different applications, especially in civil infrastructure in terms of reduced risks and lower cost. Civil infrastructure is expected to dominate more than $45 Billion market value of UAV usage. In this paper, we present UAV civil applications and their challenges. We also discuss the current research trends and provide future insights for potential UAV uses. Furthermore, we present the key challenges for UAV civil applications, including charging challenges, collision avoidance and swarming challenges, and networking and security-related challenges. Based on our review of the recent literature, we discuss open research challenges and draw high-level insights on how these challenges might be approached.

Microwave irradiation for the facile synthesis of transition-metal nanoparticles (NPs) in ionic liquids (ILs) from metal-carbonyl precursors and Ru-, Rh-, and Ir-NP/IL dispersions as biphasic liquid-liquid hydrogenation nanocatalysts for cyclohexene.

Abstract: Stable chromium, molybde- num, tungsten, manganese, rhenium, ruthenium, osmium, cobalt, rhodium, and iridium metal nanoparticles (M- NPs) have been reproducibly obtained by facile, rapid (3 min), and energy- saving 10 W microwave irradiation (MWI) under an argon atmosphere from their metal-carbonyl precursors (Mx(CO)y) in the ionic liquid (IL) 1- butyl-3-methylimidazolium tetrafluoro- borate ((BMIm)A4)). This MWI syn- thesis is compared to UV-photolytic (1000 W, 15 min) or conventional ther- mal decomposition (180-2508C, 6- 12 h) of (Mx(CO)y) in ILs. The MWI- obtained nanoparticles have a very small (< 5 nm) and uniform size and are prepared without any additional stabilizers or capping molecules as long-term stable M-NP/IL dispersions (characterization by transmission elec- tron microscopy (TEM), transmission electron diffraction (TED), and dy- namic light scattering (DLS)). The ruthenium, rhodium, or iridium nano- particle/IL dispersions are highly active and easily recyclable catalysts for the biphasic liquid-liquid hydrogenation of cyclohexene to cyclohexane with activi- ties of up to 522 (mol product)A Ru) 1 h 1 and 884 (mol product)A Rh) 1 h 1 and give almost quantitative conversion within 2 h at 10 bar H2 and 908C. Catalyst poisoning experiments with CS2 (0.05 equiv per Ru) suggest a heterogeneous surface catalysis of Ru- NPs.