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A PARALLEL, REAL-TIME FPGA IMPLEMENTATION OF THE CCSDS 123.0-B-2 STANDARD
Get PDFHyperspectral images are used in remote sensing scientific research and more, but they can reach hundreds of megabytes in size. This large number of datasets creates a problem with the limited storage capacity and bandwidth available on the satellite which in turn necessitates the use of hyperspectral image compression algorithms. The near lossless CCSDS123 hyperspectral algorithm provides a high compression capability, but it has some data dependencies in its predictor module that slows down the compression process. This Master of Science (MSc) thesis focuses on implementing a parallel, real-time FPGA based architecture of the near lossless CCSDS123 compression standard. The objective of this thesis is to compare the lossless and near lossless versions of the standards, study the parallel FPGA implementation of the CCSDS123.0-B-2 in terms of image compression performance and resource utilization trade-offs, and benchmark it to both lossless and near lossless CCSDS123 state of the art implementations. The implementation was tested on Zybo Z7 board containing a Zynq-7020 FPG. It achieved a throughput of 40.008 Msamples/s due to the critical path in the quantizer mapper and a moderately low power of 1.586 W. The implementation is realtime, far exceeding the AVIRIS’s throughput of 20.4 Mbits/s by achieving a throughput of 640.128 Mbits/s. This thesis highlights the tradeoffs between image compression performance and resources utilization for near lossless CCSDS123, helping in the development of efficient hardware designs in future
Analyzing and Navigating ETDs Using Topic Models
Get PDFElectronic theses and dissertations (ETDs) contain valuable knowledge that can be useful in a wide range of research areas. Accordingly, we are building electronic infrastructure leveraging advanced work on digital libraries, for discovering and accessing the knowledge buried in ETDs. In this paper we focus on our work to incorporate topic modeling into digital libraries for ETDs. We present ETD-Topics, a framework that extracts topics from a large text corpus in an unsupervised way. The representations learned from topic models can be useful for downstream tasks such as searching and/or browsing documents by topic, document recommendation, topic recommendation, and describing temporal topic trends (e.g., from the perspective of disciplines or universities)
Academic Passion as a Predictor of Professional Ambition among Graduate Students in Riyadh
No full textThe current study aimed to identify the relationship between academic passion and career ambition among graduate students in Riyadh, and to identify the differences between the average scores of male and female students on the two study variables according to gender (male-female). It also aimed to identify the positive impact of academic passion on career ambition among the research sample. The study adopted a descriptive correlational approach, and was conducted on (210) students, divided into (105) male students and (105) female students from graduate studies at an academic institution in Riyadh. The tools used were the Academic Passion Scale and the Career Ambition Scale (prepared by the researcher). The results revealed a strong (positive) direct correlation between academic passion and career ambition among graduate students. It also showed that there were no statistically significant differences between the average scores of graduate students on the academic passion and career ambition scales due to gender differences (male-female). The results also demonstrated a positive impact of academic passion on career ambition among the research sample students.
Keywords: Academic Passion, Career Ambition, As A Predictor, Positive Influence, Graduate Students
EXPERIMENTAL INVESTIGATION: PERFORMANCE OF RANQUE-HILSCH VORTEX TUBES UNDER VARIOUS SURFACE BOUNDARY CONDITIONS
No full textThe Ranque–Hilsch vortex tube (RHVT) is a passive thermos-fluid device that splits compressed gas into simultaneous cold and hot streams through strong swirling flow inside a slender tube, without moving parts. This study experimentally examines how external boundary conditions applied to the tube wall influence RHVT performance. Three wall conditions were imposed: (i) externally cooled (cooling), (ii) externally heated (heating), and (iii) adiabatic (insulated). Tests were conducted with air over an inlet pressure range of 2–6 bar. The primary objective was to understand the extent to which wall thermal condition modifies temperature separation and energy efficiency. Performance was quantified using the refrigeration coefficient of performance (), together with measurements of cold-end and hot-end air flow stream temperatures. Compared with the baseline unconditioned case, externally cooling the wall consistently produced the lowest cold-end temperatures across all pressures and the highest refrigeration performance. At a tube wall setpoint of 25 °C, the refrigeration coefficient of performance () improved by ~89% on average over 2–6 bar, with the maximum average gain at 4 bar (~109%); gains increased monotonically as the wall setpoint was reduced from 45 to 25 °C. Insulation yielded a slight but robust uplift (mean +4.24% in across 2–6 bar, peaking at +5.3% at 3 bar). By contrast, heating the wall reduced temperature separation and depressed , with penalties that grew with the tube wall temperature setpoint. These findings highlight the sensitivity of RHVT behavior to heat transfer at the wall and suggest that controlled external cooling can be an effective lever for improving cold-stream performance in practical applications. The results provide guidance for the design and operation of vortex-tube-based spot cooling and process temperature control, and they motivate further work to resolve optimal combinations of pressure, cold mass fraction, and wall condition under various operating parameters
EVALUATING THE IMPLEMENTATION AND EFFECTIVENESS OF THE TIERED SUPPORT MODEL FOR STUDENTS WITH ADDITIONAL LEARNING NEEDS WITHIN ADEK’S INCLUSION POLICY FRAMEWORK
No full textThis study examines the implementation and efficacy of the tiered model of support for students with additional learning needs in the UAE, in line with ADEK’s inclusion policy. The model relies on accurate identification of students, effective teacher intervention, and collaboration with parents to ensure positive learning outcomes. The study aims to evaluate the practical application of this model by assessing the validity and reliability of commonly used identification tools, such as MAP and CAT4, examining teacher preparedness, training, and progress monitoring strategies, and exploring school administrators’ perspectives on the system’s effectiveness. Using a mixed-methods approach combining assessment data analysis, surveys, and interviews, the study identifies strengths and limitations in current practices, the readiness and support of teachers to deliver interventions, and administrators’ engagement and reflections on student outcomes. Findings provide insights into how evidence-based identification, teacher training, and administrative involvement can be enhanced to improve inclusive education. By linking these critical components, the study fills gaps in understanding the practical application of the tiered support model and offers guidance for optimizing its implementation to better support students with additional learning needs
INVESTIGATING BILINGUAL CO-TEACHING IN KINDERGARTEN CLASSROOMS IN ABU DHABI
No full textThis study investigates the perceptions and experiences of bilingual co-teaching in a school in Abu Dhabi, focusing on how teachers coordinate and collaborate to support students’ learning in both Arabic and English. This study aims to understand how teachers view their roles, challenges, and professional needs when implementing bilingual co-teaching in KG1 and KG2 classrooms.This study uses a qualitative design with a bilingual open-ended survey that allows teachers to express their views freely and share examples from their daily practice. Eight teachers participated: four from KG1 and four from KG2, each working as part of an Arabic–English co-teaching pair. Their responses are analyzed thematically to identify common ideas and patterns in their experiences. The findings show that teachers see bilingual co-teaching as a valuable approach that helps students develop their language skills, confidence, and a sense of cultural identity. However, many spoke of the practical difficulties they faced, such as insufficient training, planning time, or suitable bilingual resources. These challenges show that, while bilingual co-teaching has strong potential, it is still developing as a practice in the UAE and requires stronger institutional support to reach its full potential. By focusing on teachers’ voices and experiences, this study adds to the small but growing body of research in this area. It provides insights that can guide future improvements in teacher training, curriculum design, and educational policies that support bilingual learning and co-teaching in the UAE’s increasingly multilingual and interconnected communities
How Do Emirati University Students Develop Their Academic Biliteracy? A Mixed-Method Study
No full textFramed by Hornberger’s continua of biliteracy model, this study investigated the developmental dynamics of academic biliteracy among Emirati university students. The research employed a sequential mixed-methods design, conducted across three public universities in the UAE. In the initial qualitative phase, interview data were collected from 30 students. Informed by these findings and the extant literature, a quantitative survey was then developed and administered to a sample of 299 students from various disciplines. The qualitative data were analyzed using reflexive thematic analysis, while the quantitative data were examined using advanced statistical analyses, including structural equation modeling. Three primary themes emerged from the qualitative phase. Academic Biliteracy Context encompasses the settings and factors (e.g., home, school, university, society) that shape students’ development of dual-language academic literacy. Academic Biliteracy Identity involves students’ perceptions of their own abilities and roles when performing academic tasks in two languages. Finally, the Academic Biliteracy Process comprises the cognitive, linguistic, and educational steps students undertake to develop these skills. The quantitative analysis identified key influencing factors and the complex relationships among them. Specifically, the perceived usefulness of both Arabic and English, coupled with English self-efficacy, emerged as the strongest predictors of academic biliteracy. This indicates that biliteracy development is driven primarily by positive utility values and confidence in both languages. By delineating the complex factors and dynamics that define academic biliteracy development, this study provides empirically validated information to guide the implementation of intervention programs aimed at enhancing Emirati university students’ academic biliteracy
GROUNDWATER QUALITY AND HEALTH RISK ASSESSMENT IN THE FUJAIRAH REGION USING HYDROGEOCHEMICAL, STATISTICAL, AND SPATIAL APPROACHES
No full textGroundwater is a valuable resource in the arid climate of the United Arab Emirates, where growing population, agricultural, and industrial activities are putting increasing pressure on limited groundwater reserves. This study investigates the hydrogeochemical characteristics of groundwater in the Fujairah region, with a particular focus on major ions and trace metals, to assess water quality and potential health risks. A total of 64 groundwater samples were collected from the Eastern Shallow Aquifer (ESA) and the Ophiolite aquifer in the study area and were analyzed for physicochemical parameters, major ions, and trace metals. Hydrogeochemical interpretation was conducted using Piper, Gibbs, Chadha, and Schoeller diagrams. Multivariate statistical methods were used to identify the main geochemical processes and cluster samples based on similarity. Ordinary Kriging (OK) interpolation maps highlighted hotspots of elevated salinity, major ions, and trace elements concentrations, whereas Inverse Distance Weighting (IDW) was used to compute the Water Quality Index (WQI) and Nitrate Pollution Index (NPI). Irrigation suitability was assessed using %Na, SAR, PI, MH, PS, RSC/RBSC, and KR, along with USSL/Wilcox classifications. Health risk was evaluated with USEPA’s non‑carcinogenic framework (HQ/HI) for adults and children. pH was generally neutral to alkaline with limited spatial variation across all samples, while TDS was significantly higher in ESA (180 - 22,500 mg/L) compared to the fresher water of the ophiolite aquifer (360 - 1560 mg/L). Nitrate showed hotspots and poor to extremely poor NPI classification in Fujairah City, Dibba, and Masafi, where agricultural activities are present. Facies analyses indicated Na-Cl dominance in ESA and mixed Ca-Mg-Cl-SO4 to Na–Cl evolution in the ophiolite aquifer. WQI was mostly good to excellent inland and degraded along parts of the coast. Irrigation indices frequently flagged high potential salinity and magnesium hazard, even where SAR remained low to moderate. Adult HI rarely exceeded 1, whereas children HI exceeded the safe limit in almost all samples. Lead (Pb) has exceeded the WHO safe limit of 0.01 mg/L in 11 samples, indicating potential long-term concerns. By combining multivariate, hydrogeochemical, spatial, and health risk assessment methods, this study provides a comprehensive approach to understanding groundwater quality in the Fujairah region. The findings highlight the importance of monitoring and sustainable groundwater management to protect public health and ensure long-term availability of this valuable resource
Examining Sustainable Materials: Enhancing Indoor Air Quality for Office Interiors
No full textAs awareness of environmental issues grows, the demand for healthier workspaces has led to an increased focus on sustainable building materials in office interiors. This study explores how these materials influence indoor air quality (IAQ) and the overall health of occupants. Through a qualitative analysis of multiple case studies from various regions, it is found that offices using sustainable materials, like low-emission paints and natural fiber insulation, showed a 30% improvement in IAQ compared to traditional settings. Additionally, essential criteria are identified for selecting sustainable materials, such as embodied energy and local sourcing. The findings offer practical recommendations for designers and facility managers, highlighting the importance of sustainability audits and renewable resources. This research not only adds to the existing body of knowledge but also provides valuable guidelines for architects and policymakers, encouraging the adoption of materials that enhance well-being and foster environmental responsibility.
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BERBERINE–PIPERINE CO-TREATMENT AS A POTENTIAL THERAPEUTIC STRATEGY FOR TRIPLE NEGATIVE BREAST CANCER: AN IN VITRO STUDY
No full textMassive applications were implemented to limit the risks of breast cancer, especially for the aggressive and treatment-resistant subtype triple-negative breast cancer that pose substantial obstacles for conventional approaches; therefore, natural substances have come to light as potential alternatives for anticancer therapy, especially in aggressive subtypes such as triple-negative breast cancer (TNBC). In this respect, berberine (barberry) and piperine (black pepper) are natural substances found in plants that have received extensive attention for their role as phytotherapeutic agents. Berberine has shown anti-inflammatory, antioxidant, and anticancer activities. Piperine is known to improve the bioavailability of other medications and has its own anticancer effects. In cancer research, their combination is a potential technique since it can target several molecular pathways, make treatments more effective, and provide a low-toxicity substitute or alternative to standard treatments. Hence, this dissertation seeks to provide insight into the powerful activity of berberine and piperine in combined against triple-negative breast cancer in vitro. regarding this, berberine and piperine were individually compared to their combination, indicating that the combined treatment had far stronger cytotoxic effects on MDA-MB-231 and SUM-159 cells than separated treatment. In the colony formation assay, cell survival was significantly lower, which showed that their ability to form colonies was severely limited and metastatic movement was totally restricted. Simultaneously, combination treatment hinder cell migration and wound closure on MDA-MB-231 cells notably; due to vigrous effect of combination treatment wound healing was slowed over the testing time period. In parallel, the combination of berberine and piperine successfully induced apoptosis in TNBC cells, as demonstrated by the activation of pro-apoptotic genes Bax, Caspase-3, along with Caspase-9, and the downregulation of the anti-apoptotic gene Bcl-2. Along this promising journey, this study clarifies the beneficial impact of the berberine–piperine combination, exhibiting results from each assay reliably supporting its therapeutic potential. The findings collectively support more research on berberine and piperine as a combination treatment, highlighting their ability to tackle the issues posed by aggressive TNBC