Synchronization of a renewable energy inverter with the grid

The design, mathematical analysis, and testing results of the architecture of a new all-digital phase-locked loop system for synchronizing a voltage source DC-AC single-phase inverter with the low voltage utility grid are presented. The system which is based on the time-delay digital tanlock loop was simulated using MATLAB/ SIMULINK and was tested by subjecting the grid voltage to various perturbations similar to those which can occur in a real power system, such as voltage sags and nonlinear distortion of the grid voltage waveform. Results indicate that even in the presence of such perturbations the system achieved and/or re-gained synchronization within 100 ms. The proposed system is all-digital and can be readily implemented using a field programmable gate array and easily embedded into a power inverter

Sssessment of social perception and mathematical thinking amongst Jordanian students in higher education

Mathematics is important in the human life. Despite the efforts for the development of mathematics education, it did not reach an acceptable level, because of low level in mathematical thinking and social perception of mathematics. This study aimed to examine the relationship between mathematical thinking and social perception of mathematics in Jordan higher education. This study used a quantitative survey approach. The sample of this study comprised of 338 male and 362 female first year students at Jordan universities. Two instruments were developed: a mathematical thinking test to measure students’ mathematical thinking and social perceptions of mathematics questionnaire to measure the students’ perception of mathematics. The results showed that there were statistically significant differences in whole mathematical thinking test depending on gender in favor of male, residence in favor of rural areas and interaction between gender and residence in favor of females in rural areas. The results showed that the performance of males in urban areas was better than females in urban areas and the performance of females in rural areas was better than males in rural areas. There were no significant differences in social perception towards mathematics due to gender, residence and their interactions. The results showed that the relationship between mathematical thinking and social perception of mathematics was significant and social perception of mathematics has an influence on mathematical thinking. An increase in social perception of mathematics may lead to an increase of mathematical thinking. The two instruments developed can be used as measurement scales for mathematical thinking skills and social perception of mathematics and opening the way for researchers to address issues and weaknesses related to mathematics education

LEVERAGING GEOGRAPHY TEACHERS' PEDAGOGICAL SKILLS TO ENHANCE SECONDARY STUDENTS' UNDERSTANDING OF TOURISM CONCEPTS

This study assesses the application of pedagogical skills in geography teaching environments and their influence on students' understanding of tourism concepts. A random sample of 197 teachers was selected from the Irbid district of Jordan, and data were collected using a validated questionnaire focusing on pedagogical performance skills and social pedagogical skills. The findings revealed limited proficiency among teachers in employing both skill sets to improve students' understanding of tourism concepts, with notable deficiencies in facilitating student interaction, effective communication, an d active learning strategies. The study underscores the urgent need for improved professional development for teachers and curriculum revisions to better integrate tourism concepts. The implications of this study suggest that educational stakeholde rs should adopt diverse interactive teaching methods to foster an engaging learning environment that encourages student participation. Furthermore, there is a critical need for training programs that equip teachers with innovative learning techniques based on active learning strategies, ultimately aiming to enhance the quality of education and deepen students' understanding of tourism concepts

Computed tomography scans image processing for nasal symptoms severity prediction

This paper aims to use a new technique of computed tomography (CT) scan image processing to correlate the image analysis with sinonasal symptoms. A retrospective cross-sectional study is conducted by analyzing the digital records of 50 patients who attended the ear, nose and throat (ENT) clinics at King Abdullah University Hospital, Jordan. The coronal plane CT scans are analyzed using our developed software. The purposes of this software are to calculate the surface area of the nasal passage at three different levels visible on coronal plane CT scans: i) the head of the inferior turbinate, ii) the head of the middle turbinate, and iii) the tail of the inferior turbinate. We employ image processing techniques to correlate the narrowing of nasal surface area with sinonasal symptoms. As a consequence, obstruction in the first level is correlated significantly with the symptoms of nasal obstruction while the narrowing in the second level is related to frontal headache. No other significant correlations are found with nasal symptoms at the third level. In our study, we find that image processing techniques can be very useful to predict the severity of common nasal symptoms and they can be used to suggest treatment and to follow up on the case progression

Human Readers versus AI-Based Systems in ASPECTS Scoring for Acute Ischemic Stroke: A Systematic Review and Meta-Analysis with Region-Specific Guidance

Introduction: The Alberta Stroke Program Early CT Score (ASPECTS) is widely used to evaluate early ischemic changes and guide thrombectomy decisions in acute stroke patients. However, significant interobserver variability in manual ASPECTS assessment presents a challenge. Recent advances in artificial intelligence have enabled the development of automated ASPECTS scoring systems; however, their comparative performance against expert interpretation remains insufficiently studied. Methods: We conducted a systematic review and meta-analysis following PRISMA 2020 guidelines. We searched multiple scientific databases for studies comparing automated and manual ASPECTS on Non-Contrast Computed Tomography (NCCT). Interobserver reliability was assessed using pooled interclass correlation coefficients (ICCs). Subgroup analyses were made using software types, reference standards, time windows, and computed tomography-based factors. Results: Eleven studies with a total of 1,976 patients were included. Automated ASPECTS demonstrated good reliability against reference standards (ICC: 0.72), comparable to expert readings (ICC: 0.62). RAPID ASPECTS performed highest (ICC: 0.86), especially for high-stakes decision-making. AI advantages were most significant with thin-slice CT (≤2.5mm; +0.16), intermediate time windows (120-240min; +0.16), and higher NIHSS scores (p=0.026). Conclusion: AI-driven ASPECTS systems perform comparably or even better in some cases than human readers in detecting early ischemic changes, especially in specific scenarios. Strategic utilization focusing on high-impact scenarios and region-specific performance patterns offers better diagnostic accuracy, reduced interpretation times, and better and wiser treatment selection in acute stroke care

The impact of storytelling and narrative variables on skill acquisition in gamified learning

This research attempts to better understand how students in Saudi Arabia benefit from narrative and story aspects in gamified learning environments. Data from a sample of 500 persons with varying levels of education are analyzed using quantitative methods such as descriptive statistics, correlation analysis, and multiple regression analysis. The findings point to strong positive correlations between the use of gamification in education, the influence of storytelling, narrative variables, and the acquisition of new skills. There has been a significant shift toward the use of narrative variables as measures of mastery in gamified classrooms. This study's results show that using gamified learning with story elements may increase students' interest, motivation, and knowledge retention. Efforts are now being made by Saudi Arabia to update its educational system and provide its youth with the tools they'll need to succeed in the country's emerging knowledge-based economy. The use of game-based learning and narrative-rich experiences has promising results in this setting

Exploring the molecular mechanisms of MSC-derived exosomes in Alzheimer's disease : Autophagy, insulin and the PI3K/Akt/mTOR signaling pathway

The authors thank you for acknowledging technical and financial support from the Ministry of Education and the University of Hafr Al Batin, Saudi Arabia. The authors gratefully acknowledge all mothers’ volunteers in the community around the Faculty of Agriculture, Benha University, for their cooperationPeer reviewe

Evaluation of the Wound Healing Potential of Hypericum triquetrifolium Turra: An Experimental Animal Study and Histopathological Examination

The wound healing potential of the aerial parts of Hypericum triquetrifolium Turra (Hypericaceae) was evaluated using an in vivo excision wound model in rats. Adult male Sprague Dawley rats were randomly assigned into seven groups; blank vehicles (olive oil and petroleum jelly), negative control, treatments [H. triquetrifolium ethanolic extract in petroleum jelly (5% and 10%) and H. triquetrifolium olive oil macerate (100 and 200 g/L)], and positive control (MEBO). Treatments were applied topically once daily until the wounds had completely healed. Wound areas and contraction rates were calculated, and full-thickness samples of the healed skin were collected for histopathological examination. H. triquetrifolium ointment (5%) showed the best wound healing activity with statistically significant differences when compared with the MEBO, petroleum jelly, and the negative control groups. Tissue sections were histopathologically examined in terms of re-epithelialization, granulation tissue development, collagen deposition, inflammatory cell infiltration, angiogenesis, and ulcer formation to support the in vivo excision wound model findings. H. triquetrifolium ointment (5%) showed the best histopathological scores in both re-epithelialization and ulcer formation. For quality control purposes, a high-performance liquid chromatography (HPLC) method was used to quantify key marker compounds in the extract, namely hypericin and rutin which showed a content of 0.64% and 4.46% (w/w), respectively. Based on the experimental results, H. triquetrifolium ointment (5%) exhibits remarkable wound healing properties at various stages of the wound healing process. Further investigations to prove its safety and efficacy in different types of wounds and to uncover its cellular mechanisms are warranted.This work was funded by the Deanship of Research, Jordan University of Science and Technology (Grant number: 122/2017), and Qatar University

Teacher-student rapport and gamified learning: Investigating the role of interpersonal variables in classroom integration

Using the educational setting of Jordan, this research aims to investigate the complex relationship between teacher-student rapport and student involvement in gamified learning experiences. As it relates to the effective use of gamified learning methodologies, this research digs into the far-reaching ramifications of cultivating strong interpersonal interactions between instructors and students. This research uses a strict quantitative technique to investigate the complex relationships between 400 children and 40 teachers. This study's results shed light on an interesting and statistically significant phenomenon: a significant positive connection (r = 0.742, p 0.001) between teacher-student rapport and the amount of engagement seen in gamified learning sessions. The finding, in line with Jordan's educational reforms, highlights the critical role of positive rapport in generating dynamic and significant participation within modern instructional techniques. The practical repercussions highlight the need for teachers to work to improve their interpersonal skills. It becomes clear that this is a crucial factor in enabling effective teaching and learning, especially within the context of contemporary pedagogical approaches. The current research helps us better understand the complex dynamics at play in teacher-student relationships, illuminating their far-reaching consequences for the pursuit of educational excellence in the Jordann setting

Role of Nemolizumab and Omalizumab in management of atopic dermatitis: A review

BackgroundNemolizumab (CIM331) is a monoclonal antibody that binds the IL-31 receptor α component. This inhibits IL-31 from acting on neurons that constrains the initialization of the sense of pruritus in cases of atopic dermatitis.AimsTo summarize the results of reported studies evaluating the role of nemolizumab and omalizumab in management of atopic dermatitis.Methods This is a systematic review was carried out, including PubMed, Google Scholar, and EBSCO that examining randomized controlled trials, observational, and experimental studies which study role of nemolizumab in management of atopic dermatitis.Results The review included 8 randomized studies reported efficacy of both nemolizumab and omalizumab for management of atopic dermatitis.ConclusionOther studies with large numbers of patients with AD are necessary to define the adverse effects of both drugs in the treatment of AD