AUS Repository

Recent Submissions

  • Item
    Performance Enhancement of Field-Oriented Induction Motor Control
    (2025-05) Rizwan, Ahmad; Dhaouadi, Rached; Rehman, Habib-ur
  • Item
    Rating vs. Reviews: Does official rating capture what is important to customers?
    (Elsevier, 2023-05-19) Arzaghi, Mohammad; H. Genc, Ismail; Naik, Shaabana
    This paper examines the relationship between hotels' official ratings and customer review scores. Hotel ratings aim to provide an objective assessment of the hotel's quality and experience to potential customers. However, customer reviews frequently differ from official ratings. We use data on hotels in Dubai to explore their relationship and analyze their similarities and differences. Asymmetric information hampers demand in the hotel industry if ratings do not match the customers' views of quality. Furthermore, substantial discrepancies between the two measures provide competing interests for hotel managers to satisfy rating agencies' criteria or customers' preferences, reducing the hotels' efficiency and effectiveness in offering customers the best experience and value. Our findings show that, as expected, Star Rating primarily reflects hotel-related features. In contrast, customer review scores tend to appreciate features nearby in addition to hotel amenities. Also, some hotel amenities value differently in the customer review scores and Star Rating.
  • Item
    Investigating the Effect of Patient-Related Factors on Computed Tomography Radiation Dose Using Regression and Correlation Analysis
    (MDPI, 2024-01-26) AlShurbaji, Mohammad; El Haout, Sara; Chanchal, Akchunya; Dhou, Salam; Dalah, Entesar
    Computed tomography (CT) is a widely utilized diagnostic imaging modality in medicine. However, the potential risks associated with radiation exposure necessitate investigating CT exams to minimize unnecessary radiation. The objective of this study is to evaluate how patient-related parameters impact the CT dose indices for different CT exams. In this study, a dataset containing CT dose information for a cohort of 333 patients categorized into four CT exams, chest, cardiac angiogram, cardiac calcium score and abdomen/pelvis, was collected and retrospectively analyzed. Regression analysis and Pearson correlation were applied to estimate the relationships between patient-related factors, namely body mass index (BMI), weight and age as input variables, and CT dose indices, namely the volume CT dose index (CTDIvol), dose length product (DLP), patient effective dose (ED) and size-specific dose estimate (SSDE), as output variables. Moreover, the study investigated the correlation between the different CT dose indices. Using linear regression models and Pearson correlation, the study found that all CT dose indices correlate with BMI and weight in all CT exams with varying degrees as opposed to age, which did not demonstrate any significant correlation with any of the CT dose indices across all CT exams. Moreover, it was found that using multiple regression models where multiple input variables are considered resulted in a higher correlation with the output variables than when simple regression was used. Investigating the relationships between the different dose indices, statistically significant relationships were found between all dose indices. A stronger linear relationship was noticed between CTDIvol and DLP compared to the relationships between each pair of the other dose indices. The findings of this study contribute to understanding the relationships between patient-related parameters and CT dose indices, aiding in the development of optimized CT exams that ensure patient safety while maintaining the diagnostic efficacy of CT imaging.
  • Item
    A Two-Step Femtosecond Laser-Based Deposition of Robust Corrosion-Resistant Molybdenum Oxide Coating
    (MDPI, 2023-01-18) Ali, Asghar; Piatkowski, Piotr; Nawaz, Tahir; Ahmad, Shahbaz; Ibrahim, Taleb; Khamis, Mustafa; Alnaser , Ali S.
    A two-step femtosecond-pulsed laser deposition (fs-PLD) process is reported for the rapid development of uniform, poreless, crack-free, and well-adhering amorphous coatings of source materials with a high melting point. The first step comprises a high-rate raw deposition of the source material via fs-PLD, followed by a second step of scanning the raw sample with fs laser pulses of optimized fluence and scan parameters. The technique is applied to develop substoichiometric molybdenum oxide (MoOx, x < 3) coatings on mild steel. The thickness of the layer was ~4.25 μm with roughness around 0.27 μm. Comprehensive surface characterization reveals highly uniform and relatively moderate roughness coatings, implying the potential of these films as robust corrosion-resistant coats. Corrosion measurements in an aqueous NaCl environment revealed that the coated mild steel samples possess an average corrosion inhibition efficiency of around 95% relative to polished mild steel.
  • Item
    The Scalability of Third Generation Photovoltaics: Deposition Techniques and Modularity
    (IOP, 2024) Ayoub, Mohamad; Alashkar, Adnan; Mdallal, Ayman; Ibrahim, Taleb; Khamis, Mustafa; Alami, Abdul Hai
    The development of third-generation photovoltaic (TGPV) technologies promises to address some of the limitations of conventional silicon-based solar cells. However, the scalability of these technologies is a critical factor in their practical application. TGPV include Perovskite Solar Cells (PSC), Organic Solar Cells (OSC), and Dye-Sensitized Solar Cell (DSSC). This paper reviews and summarizes the recent trends and research on the deposition techniques and modularity of TGPV. Various deposition techniques such as slot-die coating, thermal evaporation, and spray pyrolysis are discussed, along with their advantages and limitations. Modularity, which allows for the integration of TGPV cells into different structures, is also examined as a critical factor in scalability. The paper concludes that the scalability of TGPV technologies depends on the development of efficient and cost-effective deposition techniques and modularity, which will facilitate the integration of the TGPV cells into various structures and enable the widespread use of these promising technologies.

Communities in AUS Repository

Select a community to browse its collections.

Now showing 1 - 5 of 9