Engineering Commons^™

Pbs Quantum Dot-Based Hetrojunction Solar Cells, Sawsan Khader Dagher

Dissertations

This study investigates the influence of nanoparticles (NPs) size on their optical properties, and the effect of combination of lead sulfide (PbS) quantum dots (QDs), with n-type and p-type NPs, on the photogenerated charge carriers transport across the heterojunction solar cell structure. PbS QDs, of a range of sizes, were synthesized using a co-precipitation process. In this study, p-type NPs, which are poly [3,4-ethylenedioxythiophene] –poly [styrenesulfonate] (PEDOT: PSS), copper oxide (CuO) and graphene oxide (GO); and n-type NPs which are zinc oxide (ZnO), titanium dioxide (TiO2), cadmium sulfide (CdS) and bismuth sulfide (Bi2S3), were synthesized and characterized by SEM and …

Hydrodynamic Evaluation Of Climate Change And The Effects Of Coastal Effluent On The Long-Term Circulation Ofthe Arabian Gulf And Its Impact On Desalination, Abubaker Awad Elhakeem

Dissertations

The prime objectives of this dissertation are to develop, validate, and use a state of the art 30 Hydrodynamic Model (HD) to evaluate the long-term salinity and seawater temperature variations in the Gulf subject to climate change and coastal effluent; and to develop a Quantification tool that can assess the impact of projected ambient conditions upon the cost of desalination. Both objectives were realized.

Evaluating the long-term variability of seawater salinity and temperature due to climate change and coastal effluent is a growing concern. It may represent an economic and operational limiting factor in the desalination process given the clear …

Development Of An Integrated Incident And Transit Priority Management Control System, Faisal Ahmed

Dissertations

The aim of this thesis is to develop a distributed adaptive control system which can work standalone for a single intersection to handle various boundary conditions of recurrent, non-recurrent congestion, transit signal priority and downstream blockage to improve the overall network in terms of productivity and efficiency. The control system uses link detectors’ data to determine the boundary conditions of all incoming and exit links. Four processes or modules are deployed. The traffic regime state module estimates the congestion status of the link. The incident status module determines the likelihood of an incident on the link. The transit priority module …

Resource Allocation For Wireless Relay Networks, Hanan Hassan Al-Tous

Dissertations

In this thesis, we propose several resource allocation strategies for relay networks in the context of joint power and bandwidth allocation and relay selection, and joint power allocation and subchannel assignment for orthogonal frequency division multiplexing (OFDM) and orthogonal frequency division multiple access (OFDMA) systems. Sharing the two best ordered relays with equal power between the two users over Rayleigh flat fading channels is proposed to establish full diversity order for both users. Closed form expressions for the outage probability, and bit error probability (BEP) performance measures for both amplify and forward (AF) and decode and forward (DF) cooperative communication …