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Now showing items 761-770 of 797
Factors Affecting the Performance of Sub-1 GHz IoT Wireless Networks
(
Hindawi Limited
, 2021 , Article)
Internet of Things (IoT) devices frequently utilize wireless networks operating in the Industrial, Scientific, and Medical (ISM) Sub-1 GHz spectrum bands. Compared with higher frequency bands, the Sub-1 GHz band provides ...
Understanding the Nature of Capacity Decay and Interface Properties in Li//LiNi0.5Mn1.5O4 Cells by Cycling Aging and Titration Techniques
(
American Chemical Society
, 2020 , Article)
The spinel structure LiNi0.5Mn1.5O4 (LNMO) is a propitious cathode material for next-generation lithium-ion batteries for fast charge-discharge applications, but its capacity decay mechanism and rate-limiting process are ...
Safety and Operational Performance of Signalized Roundabouts: A Case Study in Doha
(
Elsevier B.V.
, 2020 , Conference Paper)
Traffic safety is one of the important challenges that urban transportation systems are facing. The common practice of assessing the safety of transportation systems starts with the collection of readily available crash ...
Impact of urban sewage sludge on soil physico-chemical properties and phytotoxicity as influenced by soil texture and reuse conditions
(
Wiley
, 2020 , Report)
Urban sewage sludge (USS) is increasingly applied to agricultural soils, but mixed results have been reported because of variations in reuse conditions. Most field trials have been conducted in cropping systems, which ...
Monitoring the variation of soil quality with sewage sludge application rates in absence of rhizosphere effect
(
Elsevier
, 2020 , Article)
Agricultural soils in semi-arid regions have frequently been degraded due to adverse climatic conditions, organic matter depletion, and poor farming practices. To enhance soil quality, this study examines the reuse of ...
Use of lignite as a low-cost material for cadmium and copper removal from aqueous solutions: Assessment of adsorption characteristics and exploration of involved mechanisms
(
MDPI
, 2021 , Article)
Lignite, as an available and low-cost material, was tested for cadmium (Cd) and copper (Cu) removal from aqueous solutions under various static experimental conditions. Experimental results showed that the removal efficiency ...
Sludge-derived biochars: A review on the influence of synthesis conditions on pollutants removal efficiency from wastewaters
(
Elsevier
, 2021 , Article)
Pyrolysis is a thermochemical process that permits the conversion of biomasses into energy (bio-oil and biogas) and a solid residue called biochar. The generation of biochar from lignocellulosic materials has been, for ...
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 ...
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 ...
Reconfiguring the Regional Security Architecture in the Persian Gulf: Intra-GCC Conflicts, Relations with Iran, and Great Power Interests
(
Gulf Studies center - College of Arts & Sciences - Qatar University
, 2021 , Conference Paper)
The member states of the Gulf Cooperation Council (GCC) -Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, and the United Arab Emirates (UAE)- were often characterized as being a part of a singular unit and assumed to be following ...