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السجلات المعروضة 6526 -- 6545 من 25974
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The double-edged sword of social media usage during the COVID-19 pandemic: demographical and cultural analyses
( Emerald Publishing , 2022 , Article)Purpose: This exploratory research aims to (1) investigate the bright and dark sides of social media use during the COVID-19 pandemic; (2) explore the impact of demographic factors on social media usage; and (3) assess the ... -
Double-zero-event studies matter: A re-evaluation of physical distancing, face masks, and eye protection for preventing person-to-person transmission of COVID-19 and its policy impact
( Elsevier , 2021 , Other)In a recent timely systematic review, Chu et al. [1] assessed the effectiveness of face masks, eye protection, and physical distancing for preventing COVID-19. Because the sample sizes are not large, especially in some ... -
Doubly dual nature of ammonium-based ionic liquids for methane hydrates probed by rocking-rig assembly
( Royal Society of Chemistry , 2016 , Article)This work presents a systematic study of methane hydrate inhibition in the presence of five structurally variable ionic liquids (ILs) belonging to the ammonium family—viz., tetra-alkylammonium acetate (TMAA), choline ... -
Downpayment, mobility and default: A welfare analysis
( Elsevier Ltd , 2018 , Article)In this paper, I study the impact of the relaxation of downpayment requirements on home-ownership and default risk in the context of a static spatial life cycle model. Given its quantitative success in matching the U.S. ... -
DPSIR framework and sustainable approaches of brine management from seawater desalination plants in Qatar
( Elsevier , 2021 , Article)Brine released from desalination plants is extremely high in salinity and contains various chemicals, which are harmful to the ecosystem. The disposal of brine has raised great concerns for the desalination industry around ... -
DPSM technique for ultrasonic field modelling near fluid–solid interface
( Elsevier , 2007 , Article)Distributed point source method (DPSM) is gradually gaining popularity in the field of non-destructive evaluation (NDE). DPSM is a semi-analytical technique that can be used to calculate the ultrasonic fields produced by ... -
DQN based Blockchain Data Storage in Resource-constrained IoT System
( Institute of Electrical and Electronics Engineers Inc. , 2023 , Conference Paper)Applying blockchain technology in the Internet of Things (IoT) systems to realize massive data storage is a promising technology, which can eliminate the dependence of IoT on central servers and protect data security ... -
Draft Genome Sequence of an Extended-Spectrum β-Lactamase-Producing Klebsiella oxytoca Strain Bearing from Qatar.
( American Society for Microbiology , 2020 , Article)is an opportunistic human pathogen causing nosocomial infection. We report the draft genome of an extended-spectrum β-lactamase-producing isolate harboring an gene, a recently discovered colistin resistance analog, from ... -
Draft legal framework for shared water resources in the Arab World: is it really needed?
( Routledge , 2021 , Article)Attempts to establish a regional water convention covering shared water resources in the Arab world have been ongoing for more than a decade. During this time, a Draft Arab Water Convention has been proposed, and the content ... -
Drafting Human Trafficking Legislation: Binding Rules and Guiding Rules
( Carolina Academic Press , 2020 , Book chapter)In this article, I devote more focused and in-depth attention to a subject area that has not received the level of attention it deserves-the first topic, which distinguishes between binding conventions and soft principles ... -
Drag On Non-Spherical Particles In Non-Newtonian Fluids
( Qatar University , 1996 , Article)The drag coefficient (CD ) was determined for three different non-spherical particles (cubes, rectangles and cylinders) of different sizes falling in two different non-Newtonian fluids (glycerol and polymer - paraffin ... -
Drained Peak and Residual Interface Shear Strengths of Fine-Grained Soils for Pipeline Geotechnics
( American Society of Civil Engineers (ASCE) , 2019 , Article)This study presents the results of interface torsional ring shear tests conducted at intermediate normal stress levels that are usually prevalent at soil-pipeline interfaces under near-shore conditions. Four normally ... -
Drained residual shear strength at effective normal stresses relevant to soil slope stability analyses
( Elsevier B.V. , 2016 , Article)An extensive torsional ring shear testing program has been conducted to measure the drained residual shear strength of soils at the wide range of effective normal stress (10 to 700 kPa) usually mobilized in reactivated and ... -
Drained residual shear strength of fine-grained soils and soil-solid interfaces at low to medium effective normal stresses: Analyses and Applications
(2016 , Master Thesis)A laboratory research program was undertaken to study the large-strain shear strength characteristics of fine-grained soils under low effective normal stresses (~3 to 6 kPa). Soils that cover a wide range of plasticity and ... -
The drama of critical discourse: the case of Richard II
( Qatar University , 1995 , Article)Contrasting them with the poet-in-a poet, Harold Bloom says that "Critics may be wary of origins or consign them disdainfully to those carrion-eaters of scholarship." That in literary criticism there is an abundance of ... -
Drastic difference between hole and electron injection through the gradient shell of Cd: XSeyZn1- xS1- y quantum dots
( Royal Society of Chemistry , 2017 , Article)Ultrafast fluorescence spectroscopy was used to investigate the hole injection in CdxSeyZn1−xS1−y gradient core–shell quantum dot (CSQD) sensitized p-type NiO photocathodes. A series of CSQDs with a wide range of shell ... -
Drawing lessons from PISA: Qatar’s use of PISA results
( Springer , 2022 , Article)Worldwide, the Programme for International Student Assessment (PISA) has emerged as a valid and reliable benchmark for assessing students’ performance and for gaining significant influence over educational policy and ... -
Drift optimization of high-rise buildings in earthquake zones
( John Wiley & Sons, Ltd. , 2011 , Article)This paper presents a Drift Design Structural Model (DDSM) for the design optimization of high-rise buildings in seismic zones. The model is formulated as a Generalized Single Degree of Freedom System subjected to equivalent ... -
Drill string nonlinear vibrations: Experimental studies and finite-element analysis
( Institute of Physics Publishing , 2018 , Conference Paper)In the present work, nonlinear vibrations of drill strings are studied. A laboratory scale arrangement consisting of a flexible rod with rotor-stator system is used to study the system dynamics. A finite-element model has ... -
Drillstring Failure - Identification, Modeling, and Experimental Characterization
( American Society of Mechanical Engineers (ASME) , 2019 , Article)Drilling is one of the costliest and risky activities in oil and gas industry due to complexity of interactions with downhole formation. Under such conditions, the uncertainty of drillstring behavior increases, and hence, ...
