تصفح Research Units حسب العنوان
السجلات المعروضة 3451 -- 3470 من 4622
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Review on recent advances in polythiophene based photovoltaic devices
( Elsevier Ltd , 2016 , Article Review)Discovery of conducting polymer introduced us to the total polymeric solar cells (PSC). During the last decade, power conversion efficiency (PCE) of these solar cells has increased from 1% to 11.5% (with the bulk heterojunction ... -
Review on Surfactant Flooding: Phase Behavior, Retention, IFT, and Field Applications
( American Chemical Society , 2017 , Article Review)Surfactant flooding is an important technique used in enhanced oil recovery to reduce the amount of oil in pore space of matrix rock. Surfactants are injected to mobilize residual oil by lowering the interfacial tension ... -
Review on two-terminal and four-terminal crystalline-silicon/perovskite tandem solar cells; progress, challenges, and future perspectives
( Elsevier , 2022 , Article Review)Silicon (Si) solar cells are the dominant and well-developed solar technology holding more than 95% share of the photovoltaic market with efficiencies over 26%. Still, this value is far away from the Shockley–Queisser limit ... -
Revisiting the economic theory of crime A state-level analysis in India
( Cogent OA , 2023 , Article)The economic theory of crime tends to suggest that deterrence variables have a significant impact on crime rates in a society. From an economic perspective, criminals are rational economic agents who weigh the likelihood ... -
Revolutionizing Emergency Healthcare with a Mobile App
( Qatar University Young Scientists Center - Qatar University , 2024 , Conference Paper)Even if it's not usually mentioned, there are numerous instances in Morocco where patients have lost their lives due to delays in ambulance response. Access to timely emergency medical services is critical, especially in ... -
Rheological and thermal properties of novel surfactant-polymer systems for EOR applications
( Wiley-Liss Inc. , 2016 , Article)In this work, two surfactant-polymer (SP) systems were evaluated for enhanced oil recovery applications. The first SP system contained partially hydrolyzed polyacrylamide and alkyl polyethylene glycol ether-based non-ionic ... -
Rheological characterization of NA2CO3 activated calcium bentonite for oil and gas drilling applications
( AIChE , 2015 , Conference Paper)Calcium bentonite was activated with soda ash (Na2CO3) at various ratios and due to the ion exchange; the original Ca-bentonite was converted to Na-bentonite. It was found that the Na2CO3 activation improves the swelling ... -
Rheology of a viscoelastic zwitterionic surfactant used in acid stimulation: Effects of surfactant and electrolyte concentration
( Elsevier , 2014 , Article)Acid diversion systems play an important role in increasing the efficiency of the acid stimulation process. Viscoelastic surfactant (VES) based diverting systems have many advantages that make them preferred for well acid ... -
Rheology of organoclay assisted extrusion of HDPE using Particle Image Velocimetry
( Institution of Chemical Engineers , 2015 , Article)Wall slip is often seen as a source of flow enhancement and can play a significant role during certain melt instabilities in polymer processing. In the present investigation, the effect of organoclay on the wall slip of ... -
Rheology of Triamine Functionalized Silica Reinforced Polymeric Gels Developed for Conformance Control Applications
( American Chemical Society , 2020 , Article)Recently, cross-linked polymers such as polyacrylamide (PAM)/polyethylenimine (PEI) have been used in conformance control applications to replace conventional lost circulation materials (LCMs). The objective of this work ... -
Rheology of upstream complex fluids
( Elsevier , 2023 , Book chapter)Rheology is an important characterizing technique as it affects all types of fluids. While oil and gas recovery is an operation that depends mainly on the interaction between different fluids, it is therefore important to ... -
Ridge penalization-based generalized linear model (GzLM) for predicting risky-driving index
( IEOM Society , 2018 , Conference Paper)Road traffic crashes remain one of the major causes of preventable death and injury worldwide. Human behavior is considered one of the main factors leading to such tragic losses. In this paper, we analyze the responses of ... -
The Rise and Fall of Teacher Leadership: A Post-Pandemic Phenomenological Study
( Routledge , 2023 , Article)This study explored teacher leadership functions during and post-school disruption, due to COVID-19 pandemic. Participants were recruited from three primary government schools in Qatar, and included 12 teachers, three ... -
The rise of Kuala Lumpur as an Islamic financial frontier
( Taylor & Francis , 2016 , Article)The rise of Kuala Lumpur as an Islamic financial frontier. Regional Studies. This paper examines Kuala Lumpur’s emergence as a prominent global Islamic financial centre. Its distance from the West and the Middle East offers ... -
Risk categorization and decision prioritization for climate change impacts: A rapid risk assessment methodology applied in the State of Qatar
( Elsevier , 2023 , Article)The impacts of climate change vary by location and severity, will be experienced over a range of timescales, and governments are not equally able to respond to risks and hazards in the same way. Yet, despite the rapid ... -
Risk Management Assessments and Recommendations Among Students, Staffs, and Health Care Workers in Educational Biomedical Laboratories.
(2021 , Article)Safety in laboratories is one of the most crucial topics for all educational institutes. All-hazards need to be identified, evaluated, and controlled whenever possible, following the risk management (RM) process. This study ... -
Road Crossing at Unmarked Mid-Block Locations: Exploring Pedestrians’ Perception and Behavior
( Springer , 2022 , Article)Violations, risky behaviors and perceptions may largely contribute to crashes involving pedestrians, particularly at unmarked mid-block locations. The likelihood and severity of crashes at mid-block locations are higher ... -
Road safety status during COVID-19 pandemic: exploring public and road safety expert’s opinions
( Taylor & Francis , 2022 , Article)The main objective of this study is to investigate the status of traffic safety and the public perception of traffic safety during the during COVID-19 pandemic. Three different data sets are used in this study: road crash ... -
Road traffic fatalities in Qatar Jordan and UAE
( World Health Organization , 2016 , Article)ABSTRACT Smeed’s equation is a widely used model for prediction of traffic fatalities but has been found inadequate for use in developing countries. We applied regression analysis to time-series data on vehicles, population ... -
Road users' behavior at marked Crosswalks on channelized right-turn lanes at intersections in the state of Qatar
( MDPI AG , 2019 , Article)At non-signalized marked crosswalks, pedestrian priority is neither well-defined nor well acknowledged by drivers. This paper presents the findings of an investigation on both driver and pedestrian behavior at non-signalized ...
