Browsing College of Engineering by Title
Now showing items 2572-2591 of 7980
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Doping amino acids with classical gas hydrate inhibitors to facilitate the hydrate inhibition effect at low dosages
( Blackwell Publishing Ltd , 2020 , Article)The formation of gas hydrates in offshore subsea lines is a major flow assurance concern for the oil and gas industry. In this work, the thermodynamic hydrate inhibition (THI) effect of doping amino acids (AA) such as ... -
Doppler compensation for AF two way relaying over time varying UWA channels
( IEEE , 2014 , Conference Paper)In this paper, we consider Doppler compensation for time varying underwater acoustic channels. The underlying system model comprises two sources, S1 and S2, communicating with each other through a relay, R. The transmission ... -
Doppler compensation for D-STBC coded time-varying underwater acoustic channels
( Institute of Electrical and Electronics Engineers Inc. , 2016 , Conference Paper)In this paper we investigate the performance of distributed space-time block coding (D-STBC) orthogonal frequency division multiplexing (OFDM) over underwater acoustic (UWA) channels. In particular, we consider a relaying ... -
Dosage Optimization of Polypropylene Fiber for Strength Enhancement of Cementitious Composites
( Qatar Univesrity Press , 2020 , Conference Paper)"Concrete is the most commonly used materials for construction in Qatar as well as in the world. Exposure to sever environmental conditions causes physical deterioration of concrete structures and significantly affect ... -
Double EWMA-Based Polynomial Quality Profiles Monitoring
( Wiley , 2016 , Conference Paper)Profile monitoring is useful whenever the quality is described by a relationship between a response and one or more of explanatory variables. It is conventional to refer to this relationship as Quality Profile. Despite the ... -
Double layered polymeric coatings for corrosion protection of steel
( Qatar University Press , 2021 , Poster)Corrosion is one of the challenging issues faced by many industries, causing substantial economic losses every year due to the degradation of metallic parts, raising many safety concerns. Therefore, it is of utmost relevance ... -
Double stage converter with low current stress for low to high voltage conversion in nanogrid
( Elsevier Ltd , 2021 , Article)A low to high voltage conversion technique has been proposed in this paper using double stages of switched inductors for nanogrid applications. The proposed converter topology utilizes fewer components, achieves high voltage ... -
Double switch two leg high gain boost converter for renewable energy applications in a DC microgrid
( Institute of Electrical and Electronics Engineers Inc. , 2020 , Conference Paper)The voltage output at the terminals of a DC generating source such as Photovoltaic and Fuel cells is not enough to be integrated with the DC bus of a microgrid. Therefore, an efficient DC-DC converter is demanded for ... -
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 ... -
Downlink Interference Analysis of UAV-Based mmWave Fronthaul for Small Cell Networks
( IEEE , 2023 , Article)In this paper, an unmanned aerial vehicles (UAV)-based heterogeneous network is studied to solve the problem of transferring massive traffic of distributed small cells to the core network. First, a detailed three-dimensional ... -
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 ... -
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 ... -
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 ... -
Driver activity recognition in virtual reality driving simulation
( Institute of Electrical and Electronics Engineers Inc. , 2017 , Conference Paper)In this research, we present the design of a driving seat with driver activities recognition based on a passive method for measuring body-postures by using two force sensor arrays to inspect the pressure patterns exhibited ... -
Drivers for energy analysis towards a BIM-enabled information flow
( Emerald Publishing , 2023 , Article)Purpose: Energy analysis (EA) within a building information modelling (BIM) enables consistent data integration in central repositories and eases information exchange, reducing rework. However, data loss during information ... -
Drivers' perceptions of smartphone applications for real-time route planning and distracted driving prevention
( Hindawi Limited , 2019 , Article)Given the increasing importance and availability of traffic-related smartphone applications, understanding their potential use is vital, especially in developing countries. This research explores motorist perceptions of ... -
Driving behaviour and sustainable mobility-policies and approaches revisited
( MDPI AG , 2018 , Article)Climate change is receiving increasing attention in recent years. The transportation sector contributes substantially to increased fuel consumption, greenhouse gas (GHG) emissions, and poor air quality, which imposes a ... -
Driving simulation sickness and the sense of presence: Correlation and contributing factors
( Elsevier Ltd , 2021 , Article)Driving simulators are useful and effective tools for conducting studies in the field of traffic safety. Simulation sickness (SS) and the sense of presence (SP) are two well-known factors that could affect the results of ...