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السجلات المعروضة 2424 -- 2443 من 4691
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l-Proline-Catalyzed Three-Component Reaction of 4-Chloro-3-formylcoumarin, Sodium Sulfide, and α-Halo Ketones: A Direct Approach to Thieno[3,2- c ]coumarins
( Georg Thieme Verlag KG , 2023 , Other)A new protocol for the synthesis of thieno[3,2-c]coumarins is disclosed. In this method, a 3-formyl-2-oxo-2H-chromene-4-thiolate anion is generated in situ by treatment of 4-chloro-3-formylcoumarin with sodium sulfide. ... -
Labor Camp Surveys in GCC Countries: Group Quarter Subsampling
( SAGE Publications Inc. , 2019 , Article)The Gulf Cooperation Council is a regional cooperation of six Middle Eastern countries-Saudi Arabia, Kuwait, the United Arab Emirates, Qatar, Bahrain, and Oman. A common feature of these countries is the existence of many ... -
Labour reforms in Qatar: continuity and change in perceptions and attitudes among citizens and migrant workers
( Routledge [Taylor & Francis] , 2023 , Article)Hosting the FIFA World Cup was a pivotal moment for Qatar and the broader Arab region, attracting attention, tourism, and economic benefits. However, it also intensified global scrutiny of Qatar's labor laws that govern ... -
Land management to reconcile ecosystem services supply and demand mismatches—A case study in Shanghai municipality, China
( wiley , 2020 , Article)© 2020 John Wiley & Sons, Ltd. City managers need to understand how land use and land cover (LULC) change in an urban landscape can affect future land degradation and conditions for ecosystem services (ESs) supply and ... -
Landscape of NAT2 polymorphisms among breast cancer.
( Elsevier Masson , 2016 , Article)PURPOSE: The prevalence of phenotypes of Arylamine N-acetyltransferase-2(NAT2) gene (i.e. fast, intermediate and slow acetylators) among ethnic groups, as well as the association studies regarding NAT2 polymorphisms and ... -
Lane-based analysis of the saturation flow rate considering traffic composition
( Informa UK Limited - Taylor & Francis , 2023 , Article)Saturation flow rate (SFR) is an essential metric for estimating the capacities of signalized intersections. Many factors, including traffic composition, configuration and geometry of the intersection, and driver behavior, ... -
Language and Nature in Southern and Eastern Arabia
(2020 , Article)This paper examines the relationship between language and nature in southern and eastern Arabia. The work is the result of a two-year interdisciplinary network between the University of Leeds and Qatar University, with ... -
Lanthanum-zinc binary oxide nanocomposite with promising heterogeneous catalysis performance for the active conversion of 4-nitrophenol into 4-aminophenol
( Multidisciplinary Digital Publishing Institute (MDPI) , 2021 , Article)This work intended to enhance the unique and outstanding properties of lanthanum by synthesizing its nanocomposite. A lanthanum-based nanocomposite was prepared by a simple and cost-effective “co-precipitation” method. ... -
Large CO2 uptake on a monolayer of CaO
( Royal Society of Chemistry , 2017 , Article)Density functional theory calculations are used to study gas adsorption properties of a recently synthesized CaO monolayer, which is found to be thermodynamically stable in its buckled form. Due to its topology and strong ... -
Laser Induced Periodic Surface Structures on Nano Metal Oxide filled Polyvinylidene Fluoride Nanocomposites
( Elsevier , 2018 , Article)The ability of polarized pulsed laser in surface modification of substrate surfaces without thermally destroying them is a well-established concept of scientific procedure. In this work, we report the laser induced surface ... -
Latest Developments in Adapting Deep Learning for Assessing TAVR Procedures and Outcomes
( Multidisciplinary Digital Publishing Institute (MDPI) , 2023 , Article)Aortic valve defects are among the most prevalent clinical conditions. A severely damaged or non-functioning aortic valve is commonly replaced with a bioprosthetic heart valve (BHV) via the transcatheter aortic valve ... -
Leaching of Some Essential and Non-Essential Heavy Metals from Modern Glazed Ceramic Crockeries Imported into Qatar from China, India and Spain
( OMICS International , 2018 , Article)In this study, the leaching potential of ceramic crockeries available in Qatar market has been evaluated using inductively coupled plasma mass spectrometry (ICP-MS). Ceramic crockeries decorated with glaze matter containing ... -
Leadership styles and AI acceptance in academic libraries in higher education
( Elsevier , 2024 , Article)This study explored the relationship between the leadership styles adopted by academic librarians and their openness to artificial intelligence (AI). The purpose was to discern whether particular leadership approaches ... -
Legacy effects of experimental environmental change on soil micro-arthropod communities
( wiley , 2020 , Article)© 2020 The Authors. Global change experiments such as experimental warming and nutrient addition strongly affect the structure and functioning of high latitude and altitude ecosystems. However, it is often unknown to what ... -
Legacy perceptions among Qatari nationals: What legacies will the 2022 World Cup bring?
( European Association for Sport Management conference , 2016 , Conference Paper)Qatar has been awarded to host the 2022 World Cup. For the Middle East this event can bring a number of changes in the region for sport and urban development. Given that the event was awarded very early in Qatar (2010) by ... -
Legal Barriers to Social Advancement with Artificial Intelligence (AI)
( Qatar University Young Scientists Center - Qatar University , 2024 , Conference Paper)This research examines social media's mental health effects. The study analyzes how existing AI could revolutionize economics, healthcare, education, and governance. AI technology raises many legal challenges that must be ... -
Leprosy: Comprehensive insights into pathology, immunology, and cutting-edge treatment strategies, integrating nanoparticles and ethnomedicinal plants
( Frontiers Media , 2024 , Article Review)Mycobacterium leprae is the causative agent responsible for the chronic disease known as leprosy. This condition is characterized by dermal involvement, often leading to peripheral nerve damage, sensory-motor loss, and ... -
Letrozole-loaded nonionic surfactant vesicles prepared via a slurry-based proniosome technology: Formulation development and characterization
( Elsevier , 2020 , Article)Slurry-based Letrozole (LTZ)-loaded proniosomes were designed using sucrose or sorbitol as carriers and various ratios of cholesterol (CH) and Tween 80 (T80) as lipid composition. Proniosomes were hydrated and probe-sonicated ... -
Level of Maternal Respiratory Syncytial Virus (RSV) F Antibodies in Hospitalized Children and Correlates of Protection.
(2021)RSV is a major cause of lower respiratory infections among children, where no vaccine is available. The stabilized form of the fusion (F) protein, pre-F, is a leading vaccine candidate targeting different populations, ... -
Levels of Airborne Bacteria in a School Classroom Environment in Doha Qatar
( Hamad bin Khalifa University Press (HBKU Press) , 2018 , Conference Paper)Airborne bacteria represent a potential risk to human health upon inhalation in both outdoor and indoor environments. Outdoors, bacteria may be derived from a variety of sources including soils, vegetation and animals, ...
