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Optimizing and validation of sustainable UHPC with waste glass powder utilizing modified particle packing approach and response surface methodology
Full text linkThe current study explores the potential of utilizing Waste glass powder (WGP) as an alternative to cement in the development of sustainable eco-friendly Ultra-high-performance concrete (UHPC). UHPC mixtures underwent optimization through the application of a Modified Andreasen and Andersen (MAA) particle packing model, resulting in a reduction of cement content from 900 to 800 kg/m3. Six mixes were cast, with varying levels of cement replacement ratios with WGP up to 50%. The evaluation focuses on the flowability, dry density, and mechanical properties of UHPC at different ages using normal curing. A statistical model utilizing response surface methodology (RSM) was employed to formulate and optimize sustainable UHPC mixtures that incorporate WGP. This approach was used to validate the effectiveness of the model by predicting the flowability and mechanical properties of UHPC in comparison to the MAA model. Cement and WGP were employed as two variables in the response surface methodology model. The models\u27 validity was assessed through the application of analysis of variance (ANOVA). The results show that at a WGP proportion of 50%, the flow diameter attains its peak with a 10% increase, the microstructure of concrete is improved by substituting 20% of the cement with WGP, which increases the compressive and tensile strengths by 5% and 7% respectively, after 90 days of normal curing when compared to the reference combination. The RSM model exhibited a significant determination coefficient (R2) of 0.9783 for flowability, 0.9863 for compressive strength and 0.9573 for splitting tensile strength after 28 days
Evaluating Energy Efficiency and Thermal Performance in Egypt’s Social Housing: Climate-Responsive Design and Material Impact in Hot Desert Environments
Full text linkAs Egypt\u27s urban areas expand rapidly, the demand for energy-efficient, affordable housing in extreme hot desert climates has become increasingly urgent. This study investigates the energy efficiency and thermal performance of Egypt’s Social Housing Project, with a focus on residential building in New Aswan City, where summer temperatures frequently exceed 45°C. Employing a validated energy model, this research simulates annual energy consumption for the building, which comprises 24 residential units, each approximately 86 m². The model integrates realistic occupancy schedules, region-specific weather data, and common household behavior patterns to closely reflect actual energy usage. Findings indicate a high alignment between simulated and observed data, with an annual energy consumption (AEC) of 5,770 kWh, achieving an accuracy within 0.36% of real measurements. Analysis highlights that construction materials, such as reinforced concrete walls with U-values of 2.663 W/m²-K, along with design features like a 10% window-to-wall ratio, play a pivotal role in moderating thermal loads. The study underscores the significance of climate-responsive design strategies—particularly in optimizing HVAC operations during peak cooling periods—and provides essential insights for improving energy efficiency in social housing developments. These findings offer practical guidelines for policymakers and designers in Egypt and similar hot climates, supporting sustainable development in affordable housing initiatives
Identifying Underachiever Gifted Students in Jordan
Full text linkObjectives: This study aimed to identify gifted students with low achievement in Jordan by studying the impact of a set of factors and variables and to provide a scale with acceptable psychometric properties to identify this category of students. Methodology: The Mixed Approach was used using the comparative descriptive approach in the quantitative part and semi-in-depth interviews in the qualitative part. (349) gifted students were selected intentionally from King Abdul Allah II Schools for Excellence from the eighth to twelfth grades, where the number of gifted students with high achievement (220) and the number of gifted students with low achievement (129) participated in the study. Results: The results showed that the scale has acceptable psychometric properties that justify its use in identifying gifted students with low achievement, and the results indicated that there were no statistically significant differences between the two study groups due to the variables of gender, school stage, and geographical region. The results also indicated differences between the gifted students with low achievement and those with high achievement in terms of talent, attitudes towards teachers, attitudes towards school, motivation, and self-organization. The results of interviews with four gifted students with low achievement showed the existence of a set of factors that affect the achievement of gifted students in King Abdul Allah II Schools for Excellence, represented by internal psychological factors, student attitudes, and the educational environment, as these factors are considered indicators of utmost importance in determining the reasons that lead to low achievement among gifted students. Conclusions: The study concluded that the study tool has acceptable psychometric properties, which justifies its use to identify gifted students with low achievement. It also concluded that a set of psychological factors and the educational environment affect the achievement of gifted students. Recommendations: The study recommends developing educational and psychological support programs for gifted students with low achievement, improving the educational environment, motivating teachers to provide better support for this group, and periodically monitoring and evaluating the effectiveness of the scale used
Antibacterial Effect of Silver Diamine Fluoride and Glass Ionomer Cement Restorations against Streptococcus Mutans (An in vitro study)
Full text linkObjective: To determine the antibacterial effect of silver diamine fluoride and glass ionomer cement restoration against streptococcus mutans. Materials and methods: This study included 10 blood agar plates, the anti-bacterial efficacy of each matter was estimated against streptococcus mutans using agar diffusion test. Streptococcus mutans was prepared on blood gar plate. Three wells (A,B,C) with a diameter of 5 mm were performed in each plate and totally filled with one of the tested substances. The test materials were divided into three groups: group A (SDF): silver diamine fluoride, group B (GI): glass ionomer and group C (SDF+GI) were placed into uniform wells that punched in the agar plate. The plates were left for 30 minutes for diffusion at room temperature, then incubated for 48 hours at 37 °C in the incubator. A digital caliper estimated the aacterial growth zones in millimeter. Results: Results of the current study showed significant antibacterial effect of SDF against streptococcus mutans compared with SDF and GI combination and showed that GI has no significant antibacterial effect against streptococcus mutans. Conclusions: SDF has excellent bacteriostatic activity against cariogenic strains of S. mutans, GI has no significant antibacterial effect against s. mutans and SDF and GI combination has lower antibacterial effect compared with SDF alone
درجة توظيف نظم المعلومات الإدارية لدى مديري المدارس الحكومية في سلطنة عمان وعلاقتها باتخاذ القرارات
Full text linkهدف المقال الكشف عن درجة توظيف نظم المعلومات الإدارية لدى مديري المدارس بالحلقة الثانية من التعليم الأساسي في محافظة جنوب الباطنة في سلطنة عمان، ودرجة ممارسة عمليات اتخاذ القرارات الإدارية، وتحديد العلاقة بينهما، بالتطبيق على عينة بلغت (385) معلماً ومعلمة بمدارس الحلقة الثانية من التعليم الأساسي في محافظة جنوب الباطنة بسلطنة عمان، استخدم الباحثون المنهج الوصفي الارتباطي، من خلال تطبيق استبانة. وتوصلت الدراسة إلى أن درجة توظيف نظم المعلومات الإدارية ودرجة ممارسة عمليات اتخاذ القرارات الإدارية لدى مديري المدارس الحلقة الثانية من التعليم الأساسي في محافظة جنوب الباطنة جاءت بدرجة مرتفعة، وجود علاقة طردية دالة إحصائيا بين درجة توظيف نظم المعلومات الإدارية واتخاذ القرارات الإدارية لدى مديري المدارس الحلقة الثانية من التعليم الأساسي في محافظة جنوب الباطنة من وجهة نظر المعلمين. وأوصت الدراسة بعقد المزيد من ورش العمل والدورات التدريبية لمديري المدارس بالمحافظة؛ لتوضيح الغاية من استخدام نظم المعلومات الإدارية، والدور الذي يلعبه في اتخاذ القرار
The article aimed is to reveal the degree of employing management information systems among school principals in the second cycle of basic education in South Al Batinah Governorate in the Sultanate of Oman, and the degree of practicing administrative decision-making processes, and determining the relationship between them, by applying it to a sample of (385) male and female teachers in schools in the second cycle of basic education in South Al Batinah Governorate in the Sultanate of Oman. The researchers used the descriptive correlational approach, by applying a questionnaire. The study concluded that the degree of employing management information systems and the degree of practicing administrative decision-making processes among school principals in the second cycle of basic education in South Al Batinah Governorate were high, and there was a statistically significant direct relationship between the degree of employing management information systems and administrative decision-making among school principals in the second cycle of basic education in South Al Batinah Governorate from the teachers\u27 point of view. The study recommended holding more workshops and training courses for school principals in the governorate; to clarify the purpose of using management information systems, and the role it plays in decision-makin
Difficulties and Challenges Facing Use of Interactive Multimedia Applications (IMMs) to Develop the Skills of Reading and Writing in English from the Visually Impaired Students\u27 Points of View at the Syrian Governmental Universities
Full text linkThe article aimed to identify the challenges and difficulties associated with the use of interactive multimedia applications (IMMs) for developing the skills of reading and writing in EFL (English as a foreign language) from the perspective of visually impaired students at the Syrian governmental universities, considering their gender and academic year as variables, on which the article problem relies on. The researcher developed a questionnaire of 43 questions, and divided them into three sections and two main themes. After the validity of the questionnaire had been verified, and its stability had been calculated as well, it was applied to gather the required data from 30 visually impaired university students (22 females and 8 males) in the Syrian Arab Republic as a model. The researcher applied the descriptive-analytical method to address the topic of the article. The results of the article shows that there is no statistically significant difference between the students\u27 opinions regarding the gender variable at the 0.5% significance level. However, there is a statistically significant difference at the 0.5% significance level between the students\u27 opinions regarding the grade variable. Moreover, the effect of the interactive multimedia applications (IMMs) use on developing the reading and writing skills is also generally statistically significant from the perspective of visually impaired students at the Syrian governmental universities. The researchers also developed a number of suggestions to improve the use of IMM applications by English language learners with visual impairments, all of which are intended to improve their learning skills and outcomes
هدف المقال تحديد التّحديات والصّعوبات التي تواجه استخدام تطبيقات الوسائط المتعددة التّفاعلية (IMM) لتطوير مهارتيّ القراءة والكتابة باللغة الإنجليزية، كلغة أجنبية، من وجهة نظر 30 طالباً من طلاب الجّامعات السورية الحكومية ضعاف البصر، مع الأخذ بعين الاعتبار الجنس والسّنة الدراسية الأكاديمية كمتغيراتٍ للبحث، والاستناد عليها لتحديد المشكلة البحثية. ولتحقيق شروط هذه الدراسة النموذجية، قامَ الباحثُ بإعداد استبانة مكوّنة من 43 بنداً، مقسمة إلى 3 أقسامٍ وموضوعَين رئيسيّين. وبعد التّحققِ من صحّة الاستبانة وحسَاب ثباتها، تم تطبيقها على 30 طالباً وطالبة (22 إناث ، 8 ذكور) من ضعاف البصر، ممّن يدرسون بالجّامعات الحكوميّة في الجمهوريّة العربيّة السوريّة. وقد اعتمدَ الباحثُ على المنهجِ الوصفيّ التّحليليّ في تناول موضوع البحث نظرياً، كما واستخدمَ الباحثُ برنامج الحِزَم الإحصائية للعلوم الاجتماعية (SPSS)، الإصدار 25، لتحليلِ البيانات. لقد أوضَحَتْ نتائجُ البحثِ عدمَ وجودِ فروق ذات دلالةٍ إحصائيّةٍ عند مُستوى دلالة 0.5٪ بين آراء الطّلاب ضعاف البَصَر بالنّسبة لمتغيّرِ الجّنس، مع وُجود فروق ذات دلالة إحصائيّة فعليّة عند مستوى دلالة 0.5٪ بين آراء الطّلاب ضِعَاف البَصَر بالنّسبة لمتغير السّنة الدّراسيّة الأكاديميّة. مع وجود تأثيرات عامة ذات دلالة إحصائيّة لاستخدام تطبيقات الوسائط المتعددة التفاعلية (IMM) لتطوير مهارات القراءة والكتابة باللّغة الإنجليزيّة من وجهة نظر الطلاب ضعاف البَصَر بشكلٍ إيجابيّ. كما وتوصَّلَ الباحثُ إلى مجموعةٍ من المقترحاتِ بغرض تطوير استخدام تطبيقات IMM من قبل متعلّمي اللّغة الإنجليزيّة ضِعَاف البَصَر. كلُّ ذلكَ لإثراء قُدُراتهم التعليميّة-التّعلميّة ومُخرَجَاتِهِ
Decision-making Skill as a Mediating Variable in the Relationship Between Organizational Loyalty and Change Leadership- a Proposed Model Among School Principals in Ramallah and Al-Bireh Governorate
Full text linkObjectives: The study aims to reveal the relationship between organizational loyalty and change leadership among school principals in Ramallah and Al-Bireh Governorate considering decision-making skill as a mediating variable. Methodology: The study uses the descriptive, correlational approach, where the study population represented school principals in Ramallah and Al-Bireh Governorate, who numbered 306 male and female principals. The study sample was chosen by a stratified random method, and its size was 171 Principals. Results: The results show that the average for organizational loyalty among school principals in Ramallah and Al-Bireh Governorate reached (3.74), with a high level, while the average for change leadership reached is (3.99), a high level. It was found that the most common decision-making skills among school principals is the dependent style, with an average of (3.94) and a high level, and the least prominent is the spontaneous style, with an average of (2.40) and a moderate level. It is clear from the results of the analysis that there is a statistically significant indirect path between organizational loyalty and change leadership, through decision-making skill. This means that there is an effect of decision-making skill as an intermediary variable between organizational loyalty and change leadership. Conclusion: The study recommends adopting the proposed model to activate the role of decision-making skills in developing the relationship between organizational loyalty and change leadership among school principals in Palestine
Obstacles Imposed by Families Against University Youth Participation in Political Parties in Jordan
Full text linkObjective: This study aimed to identify the obstacles imposed by families that hinder the participation of university youth in the political life from their perspective and investigate the relationship between obstacles imposed by families and certain social variables. Methodology: The study adopted a descriptive approach and the sample was selected by a simple random method and consisted of 250 students from Princess Rahma College at Al-Balqa Applied University and it was distributed electronically. Results: found that the economic situation of the family was one of the prominent obstacles to youth participation in political parties. And there is a lack of family-oriented programs regarding political parties and their importance. The results also showed that families have concerns about the ideas proposed by some political parties, which could affect their children\u27s future. The study did not find statistically significant differences at the (α = 0.05) level in the level of obstacles imposed by families that limit the participation in political life, attributed to the variables of (gender, academic level, place of residence, and monthly income). Conclusions: Economic constraints, the lack of awareness programs aimed at parents, and parents’ concerns about their children’s participation limit the children’s involvement in political parties. Recommendations: Based on the results, the study recommends the importance of reducing financial barriers that hinder youth participation in political parties, as well as raising awareness, providing guidance, and educating families about the importance of supporting the political involvement of university youth in parties
Design and Development of a Low-Cost Educational Robot: A Scalable and Affordable Software Learning Platform
Full text linkThis study presents the design and development of a low-cost educational robot to enhance learning experiences in robotics and programming. The system integrates robust software development, ensuring seamless interaction between sensors, actuators, and a custom-designed graphical user interface (GUI). The robot is equipped with various sensors and actuators to support a broad range of experiments and educational applications. The software architecture is detailed, focusing on its modularity and ease of use, enabling students to intuitively program and interact with the robot. Additionally, a series of experiments were conducted to evaluate the performance of the sensors and actuators, providing insights into their reliability and accuracy. The GUI was designed to offer an accessible platform for users to control robots and visualize real-time data, enhancing engagement and usability. The findings demonstrate that this low-cost solution can serve as an effective tool for robotics education, fostering students\u27 hands-on learning and creativity. Ultimately, this project represents a significant step toward enhancing robotics education at an affordable price, allowing more students to explore this advanced technological field
A Generalized Plant Disease Detection Technique Based On Residual Network With Efficient Channel Attention
Full text linkThe detection of plant diseases a vital task for ensuring crop health and optimizing agricultural productivity. Machine learning and computer vision have significantly advanced the automation of plant disease detection. However, traditional methods face several challenges, particularly with data annotation and the limitations of task-specific models, which often fail to generalize across different plant diseases. These methods are hindered by their reliance on models tailored to individual crops and the ongoing need for manual inspections, leading to inefficiencies and restricted scalability. This study proposes a method designed to enable the efficient and accurate identification of a broad range of plant diseases based on residual network-101 integrated with efficient channel attention mechanism. The residual network effectively learns deep features from plant images, while the efficient channel attention mechanism emphasizes relevant features in the network, improving the model’s focus and robustness. To evaluate the effectiveness of our approach, we trained and tested our model using the widely recognized PlantVillage dataset, known for its diverse and comprehensive representation. Our method achieved an accuracy of 99.45%. Additionally, when tested on new, unseen datasets, the model reached an accuracy of 98.45%, demonstrating its robustness and ability to generalize effectively to unfamiliar data