Digital Commons Network^™

Optimal Sizing Of Pv Water Pumping System For Off-Grid Rural Communities, Basma Abulkheir, Eid Gouda, A. A. Hegazi, Amir Abdel Menaem

Mansoura Engineering Journal

A large population worldwide lives in remote rural communities without access to electricity due to the limited reach of national transmission networks. This creates significant challenges in accessing water, hindering improvements in living conditions for off-grid communities. Photovoltaic water pumping systems (PVWPSs) offer a viable solution to this issue, but their sustainability must be examined due to the unpredictable nature of solar radiation. This paper presents a practical techno-economic approach to optimally size a PVWPS. A Particle Swarm Optimization (PSO) algorithm is employed, considering technical and economic indicators like life cycle cost, loss of load probability and PV curtailment rate. …

Attending To Present Others: A Framework For Supporting Multilingual Graduate Writers, María P. Carvajal Regidor, Allison Kranek

The Writing Center Journal

Extending prior work on present others, individuals who are not physically present in writing center sessions—such as advisors, colleagues, and peers—but who directly or indirectly impact what happens during consultations (Kranek & Carvajal Regidor, 2021), we argue that attending to present others is one way to more holistically support multilingual graduate writers. Based on data from session recordings, we contend that present others can be used as a framework to train consultants to better address the specific needs of this student population by acknowledging their socialization processes, feedback networks, language needs, and emotions. Then, we share two approaches to consultant …

Implementation Of Machine Learning And Large Language Models For High Entropy Alloys, Ruth E. Mellin

Mechanical Engineering and Materials Science Independent Study

High-entropy alloys (HEAs) are a relatively recent class of materials formed by alloying five or more elements in near-equimolar ratios. Their promising mechanical and thermal properties make them promising for a wide range of applications, however, the vast compositional space presents a challenge for efficient exploration. As a result, robust and structured databases are critical for guiding HEA research and accelerating materials discovery. In this project, a computational pipeline was developed to leverage large language models (LLMs) for extraction of compositional data and relevant properties from existing HEA literature. The program integrates structured prompt design, parallel execution, and deterministic post-processing …

Analysis Of Students' Problem-Solving Skills In Work And Energy Based On Gender, Miftahuljannah Muslimin

Jurnal Pendidikan Sains

This study analyzes students’ problem-solving skills on Work and Energy using a quantitative descriptive design, profiling performance across five indicators without causal claims. Participants were 85 students from SMA Negeri 1 Barru, South Sulawesi (30 males, 55 females) who answered five essay items scored on useful description, physics approach, specific application, mathematical procedure, and logical progression. Overall means were 57.73 (females) and 60.73 (males); an independent t-test showed p = .333 > .05 with Cohen’s d = 0.22 (small), indicating no meaningful overall difference. By indicator, ANOVA showed no gender differences (α > .05) except for logical progression (p = .029). …

An Advanced Multi-Branch Recurrent Deep Learning Model For Predicting The Antibacterial Capacity Of Nanoparticles With Shap-Based Explainability, Shaimaa M.S. Zainulabdeen, Najee B. Haifaa, Iman Ali Atiyah

Muthanna Medical Journal

The antibacterial properties of nanoparticles play a crucial role in industries such as textiles, water disinfection, pharmaceuticals, and food packaging. Given the rising concerns over antibiotic resistance, metal oxide nanoparticles (NPs) have emerged as a promising alternative. While machine learning techniques in nano informatics have shown encouraging results in predicting the antibacterial efficacy of nanoparticles, the application of deep learning methods in this domain remains limited. This study introduces a novel predictive model based on a multi-branch recurrent neural network, incorporating three types of recurrent cells: LSTM, BiLSTM, and GRU, to estimate the antibacterial effectiveness of nanoparticles. The proposed model …

Prevalence Of Tobacco Use And Awareness Of Its Effects Among First Grade Of University Students, Yaseen T. Srhan

Muthanna Medical Journal

Background: Tobacco is a leading cause of preventable mortality and morbidity. College students are at high risk of smoking as they are prone to higher availability of cigarettes and stress. Although medical students are aware about the health hazards of tobacco smoking, they, as well as physicians, smoke. Consumption of tobacco and tobacco products, by smoking in particular, is considered to impose a net social cost to society. Smoking and tobacco use are increasingly considered to have acquired the dimensions of an epidemic. Aim: The study estimates the prevalence of smoking and assesses socio-demographic correlates of smoking and characteristics of …

The Role Of Linear Programming And Sensitivity Analysis In Improving The Transportation And Distribution Of Vegetable Oils: A Case Study Of The State Company For Vegetable Oils In Iraq, Zainab Alaa Hameed

Muthanna Journal of Administrative and Economics Sciences

The State Company for Vegetable Oils in Iraq faces a fundamental challenge of high transportation costs and inefficiency in distributing products across factories and warehouses to meet growing demand. Accordingly, this study aims to employ operations research methods-specifically linear programming and sensitivity analysis---to design a distribution plan that enhances efficiency and minimizes costs. The methodology involved developing a mathematical model of the transportation problem based on actual data related to supply quantities, demand requirements, and transportation costs between production sources and distribution outlets. The model was solved using WinQSB software to determine the optimal solution. Sensitivity analysis was then conducted …

Economic Resilience As A Mediator: Assessing The Impact Of China’S Grazing Withdrawal Project On Herders’ Well-Being In The Yellow River Source Region, Lihua Zhou

Double Helix Methodology

Investigating how China’s most extensive grassland conservation program, the Grazing Withdrawal Project, impacts herders’ resilience and welfare levels is crucial for promoting sustainable grassland protection and enabling herders to withstand external shocks. However, few empirical studies have linked policy measures, economic resilience, and subjective well-being. Based on 266 questionnaires from the Yellow River Source Region, we constructed an indicator system for evaluating economic resilience and employed multiple linear regression to explore the key variables affecting herders’ economic resilience and subjective well-being under the context of the project and to clarify the mediating effect of resilience in translating government interventions into …

Toward An Orderly And Efficient Post-Disaster Humanitarian Material Donation System: A Case Study Of The ‘9·5’ Luding Earthquake, An Chen

Double Helix Methodology

Purpose – This study aims to assess the orderliness of the humanitarian material donation system (HMDS) following the 2022 “9·5” Luding Earthquake in China, providing insights into improving disaster relief efficiency and promoting postdisaster recovery. Design/methodology/approach – The orderliness of the HMDS is evaluated across three dimensions: donation input, donation output and donation environment. Correlation entropy and running entropy models are used to assess the system’s dynamics and to compare the performance of four donor types: government, enterprises, organizations and individuals. Findings – The early emergency phase (the first 12 days after the earthquake) is characterized by disorder and repeated …

The Concept, Dimensions, And Measurement Of Innovative Competitive Behavior Of Chinese Scientific And Technological Personnel, Rui Li

Double Helix Methodology

Introduction: While competitive behavior in innovation activities is increasingly prevalent in practice and actively promoted by policymakers, it remains an under explored area in academic research. To bridge this gap, we introduce the concept of “innovative competitive behavior,” providing a conceptual definition and clarifying its theoretical boundaries, rooted in social comparison theory from psychology. Methods: A mixed-methods approach was employed to systematically examine this construct. First, a qualitative study guided by grounded theory was conducted to explore the core dimensions of the construct. Subsequently, a quantitative phase involved the development and validation of a psychological scale through questionnaire surveys and …

Mechanical And Durability Properties Of Cement Panels Reinforced With Hybrid And Pva Fibers, Shukran H. Faraj, Mohammed J. Kadhim

Al-Esraa University College Journal for Engineering Sciences

This study examines the synergistic effects of hybrid fibers (HF) and polyvinyl alcohol (PVA) fibers on the structural and thermal properties of silica-fume cement panels. Scanning electron microscopy (SEM) was employed to examine mortar mixtures with varying fiber content to assess their enhancement of microstructure. We conducted several experiments on compressive, flexural, and splitting tensile strength, in addition to water absorption and thermal conductivity. The results indicate that 1% HF exhibits superior mechanical qualities, with a compressive strength of 46.89 MPa, a flexural strength of 8.56 MPa, and a reduced thermal conductivity of 0.83 W/m•K. PVA fibers at 2% enhance …

Characterization And Biocompatibility Test Of Chitosan-Alginate-Fucoidan Hydrogel As Potential Socket Preservation Material: In Vitro Study, Ainiyyah F. Zaizafun, Nurlindah Hamrun, Erni Marlina, Lenni Indriani, Nurhayaty Natsir, Asdar Gani, Arifin

Journal of Dentomaxillofacial Science

Objective: This study aimed to characterize and evaluate the in vitro biocompatibility of chitosan-alginate-fucoidan hydrogel at different concentrations as a potential socket preservation material.

Material and Methods: Hydrogels were prepared using various concentrations of chitosan-alginate-fucoidan formulas. Alginate and fucoidan which were extracted from brown algae, were dissolved in purified water with stirring, then mixed with chitosan from white shrimp skin, which was prepared in 2% acetic acid. The hydrogels were characterized using scanning electron microscopy (SEM) and Fourier transform-infrared spectroscopy (FTIR). Biocompatibility was assessed using KUSA cells through cell viability, cytotoxicity, and cell adhesion. Data were analyzed using a one-way …

Helical Coil Compression Spring Retrofit Design Of Wheelbarrow For Optimal Load Carrying Effectiveness, Cornelius Ogbodo Anayo Agbo

Makara Journal of Technology

Wheelbarrows are essential multipurpose and dual-function materials handling equipment for many industries and homes. They find exclusive use in the movement of finished goods and raw materials where no other form of transportation works. However, the traditional wheelbarrows require enormous human effort to accomplish the task of conveying a reasonable amount of load from one place to another. During the process, shock loads from road irregularities are transmitted directly to the Barrow pusher. Therefore, this study investigated a retrofitted helical coil, compression spring, wheelbarrow design for effective load transportation. A wheelbarrow with a trapezoidal bucket capacity of 50 l was …

Aerodynamics And Heat Transfer In Polymer Blown Film Processing: Experimental And Numerical Investigation, Mohammad Luqman Zulbakri, Nur Atiqah Mat. Rautin, Raa Khimi Shuib, Ku Marsilla Ku Ishak, Auratus Zuratul Ain Abdul Hamid, Mohamad Danial Shafiq, Mohamad Yusof Idroas, Muhammad Khalil Abdullah

Makara Journal of Technology

The effects of airflow dynamics, heat transfer, and mechanical properties on the HDPE blown film extrusion process were examined using a single-lip air ring with a fixed compressed-air valve opening angle of 10°. Reynolds numbers ranging from 9175 to 25911 were analyzed to understand their impact on cooling efficiency, bubble morphology, and film properties. Numerical simulations employing the Standard k−ω turbulence model in ANSYS FLUENT v2023, with mesh refinement achieving y+ ≈ 1, captured detailed flow and heat transfer behavior. Results showed that higher Reynolds numbers significantly enhanced the heat transfer coefficient, with values increasing from 1096 W/m²·K at Reynold …

Counter-Mapping A Sugar Mill In Mascarilla, Afro-Ecuadorian Ancestral Territory Of The Chota Valley, Andrea E. Chavez Chuquimarca

Graduate Masters Theses

This project examines the legacies of the colonial hacienda (estate) system in the community of Mascarilla, situated in the Ancestral Territory of the Chota Valley, Carchi Province, in the northern highlands of Ecuador. This study is framed within the first half of the 20th century, during the early stages of industrialization in Ecuador, and the last period in which the Trapiche de Mascarilla was still functioning. These elements will be viewed through the lens of the archaeological feature of the trapiche (panela production facility), serving as a referential space of history under the huasipungo system (debt-peonage). The interconnected components of …

Empowering Youth In A Changing Climate: Design, Implementation, And Evaluation Of A Salt Marsh Summer Science Program, Dan Levesque

Graduate Masters Theses

Climate change presents not only environmental challenges but also emotional challenges for today’s youth. This thesis documents the design, implementation, and evaluation of a field-based summer science program aimed at empowering adolescents with coastal salt marsh ecology while addressing climate change emotions and science identity development. The program, based in a Massachusetts salt marsh, was adapted from existing public environmental curricula and guided by place- and experience-based learning principles. Over Spring and Summer 2025, 13 students (ages 13-18) participated in extra-curricular field trips, hands-on research activities, and reflective discussions about the environment and the emotions it brings forth. Pre- and …

Information Processing In Quantum Thermodynamic Systems, Shou-I Tang

Graduate Masters Theses

This thesis extends the classical autonomous Hamiltonian framework of information thermodynamics to the quantum regime. In this formulation, a composite system consisting of a principal system, a heat bath, a memory, and a work source is described by fully quantum, time-independent Hamiltonian dynamics. By introducing the quantum speed limit (QSL) for the system and memory subsystems, referred to as the Quantum Thermodynamic Speed Limit (QTSL), I establish a connection between the QTSL and Landauer’s principle. This relationship reveals the fundamental constraints on quantum information processing in terms of dynamics and energy costs during the evolution. Furthermore, I present an interpretation …

Wilhelm Von Humboldt And The Idea Of The Modern University: The Unity Of Bildung And Wissenschaft, Ken Udas

Graduate Masters Theses

Wilhelm von Humboldt and the Idea of the Modern University examines Wilhelm von Humboldt’s contribution to shaping a philosophical ideal that has profoundly influenced the concept and identity of the modern research university for over two centuries. It highlights Humboldt’s position as a key figure in the Prussian reform movement and as the founder of the University of Berlin. Specifically, it addresses a question raised in the late twentieth century as part of the Mythos Humboldt revision: why has the Humboldtian Ideal maintained such lasting influence over the German university system, even as its practical realities have increasingly strayed from …

Analysis Of Penis Size Differences In Patients With Severe Erectile Dysfunction Non-Responsive Pde5i With Mesenchymal Stem Cell Secretome From Umbilical Cord, Kristophorus Jonathan Wibowo, Reny I’Tishom, Mohammad Ayodhia Soebadi, Muhammad Hidayat Surya Atmaja, Supardi Supardi, Ria Margiana, Fatkhurrohmah Leo Amalia

Folia Medica Indonesiana

The ineffectiveness of PDE5i[-10pc]AU: Please provide the affiliation of all authors. therapy is indicated by the patient’s unresponsiveness to oral medication, evidenced by insufficient erection after four attempts with the dosage recommended by the manufacturer. Consequently, the application of regenerative therapy may be seen as an effort to stimulate a response or improvement in erectile function, especially in individuals with erectile dysfunction who exhibit no significant progress after utilizing PDE5 inhibitors. Regenerative therapy seeks to repair damaged erectile tissue, with the objective of enhancing erectile function and rehabilitating tissue impacted by existing comorbidities. The secretome denotes the aggregate of chemical …

Experimental Analysis Of Droplet Deformation Dynamics In Combined Dc Electric And Shear Flow Fields Using Dpiv, Ayad Ibrahim Khlewee

Al-Esraa University College Journal for Engineering Sciences

This paper presented a systematic study of such droplet deformation at the intersection of uniform DC electric field and hydrodynamic shear flow, in which we focused on conductivity ratio (R) and permittivity ratio (S), describing their influence. The results demonstrate that droplet dynamics is extremely sensitive to the regime: under DC only, either elongation or compression depending on whether R > S or R S, similarly to classical EHD predictions. Under shear-only conditions, deformation was dictated by the balance of elongational stresses (EC) and rotational stresses (RC), with increasing capillary number (Ca) leading to progressive elongation and oscillatory orientation dynamics. When …

The Imaginary In Architecture: The Conceptual Structure Of The Imaginary And Its Manifestations In Architectural Text, Noora Ghadir Hlail, Abbas Ali Hamza Al Greiza

Al-Esraa University College Journal for Engineering Sciences

This study explores the concept of the imaginary as a collective cognitive and cultural structure that shapes symbolic reality through images, myths, and deeply rooted symbols in collective memory. The research applies this concept within the field of architecture, aiming to understand how the imaginary is embodied in architectural texts as symbolic carriers of identity and cultural meaning. Adopting a descriptive-analytical methodology, the study develops a theoretical framework comprising key components—preconditions, mechanisms, and traits of the imaginary—and applies it to two selected case studies: the General Secretariat of the Iraqi Council of Ministers and the Louvre Abu Dhabi Museum. The …

Generative Ai For Method Development In Analytical Chemistry: A New Paradigm In Experimental Design And Optimization, Yasir Fathi Mahmood

Al-Esraa University College Journal for Engineering Sciences

The fast development of artificial intelligence (AI), especially generative AI models, is changing the environment of analytical chemistry. As classical method generation in analytical methods relies on manual trial-and-error methodology as well as statistical methods, generative AI is a new paradigm with automated generation of experimental methodology and optimization. In this paper, the authors discuss the use of generative AI-based technologies, including large language models (LLMs) and neural network-based generators, to create new, efficient, and customized methods of analysis. The paper examines existing applications, technology frameworks, and issues and offers a roadmap with regards to the future incorporation of generative …

Numerical Modeling And Experimental Validation Of A High-Temperature Latent Heat Thermal Energy Storage System Using Metallic Phase Change Materials For Concentrated Solar Power Applications, Fouad Hashim Sharhan

Al-Esraa University College Journal for Engineering Sciences

To ensure reliable performance for the power-block of CSP plants, high power density and near-isothermal discharge must be achieved. A robust means of achieving this is through thermal energy storage (TES). High temperature latent heat storage (LHS) with phase change materials (PCMs) can serve these purposes, however the conventional salts used in PCMs typically suffer from low thermal conductivity that limits power density and increases energy storage charging/discharging times. This manuscript investigates ways to address these limitations using high temperature metallic phase change materials (MPCMs) while also developing a validated numerical framework to aid in their design. To this end, …

Thermal Performance Evaluation Of Solar Cooling Systems For Educational Facilities In Baghdad, Yasser Alawi Mohammed Attia Al-Jubouri

Al-Esraa University College Journal for Engineering Sciences

Schools in Baghdad also suffer from poor thermal comfort, which is a common problem in high-temperature and low-humidity arid climates such as that of the city, where using cooling devices leads to a large energy demand and overloads on the national power grid. Such study offers a thorough assessment of the thermal performance of solar-based cooling systems in an efficient manner to be suitable for educational buildings in Baghdad. The analysis is centred on a solar thermal cooling system with absorption as the heat interaction medium, and an experimental characterisation and mathematical simulation itself are performed. A pilot installation, consisting …

Optimal Control Of Stochastic Systems: A Numerical Study Of The Stochastic Linear Quadratic Regulator Framework, Gülşen Orucova Büyüköz, Yaprak Güldoğan Dericioğlu, Tuğçem Partal

Mathematical Modelling and Numerical Simulation with Applications

Optimal control of stochastic linear systems is fundamental in control theory, with applications in robotics, finance, and engineering. The Stochastic Linear Quadratic Regulator (SLQR) derives optimal feedback laws via the Riccati equation but requires numerical discretization of the resulting stochastic dynamics. Despite extensive studies on numerical methods for stochastic differential equations, their performance within the SLQR framework remains insufficiently explored. This study compares two predictor–corrector schemes of different orders: the Order 1.0 Predictor-Corrector (PC) method and the Order 2.0 Weak PC method. A one-dimensional linear quadratic problem with a closed-form solution enables precise error evaluation against the analytical trajectory. Convergence …

From “Contact Zone” To “Collaborative Zone”: Multilingual Writers’ Tensions And Opportunities In The Writing Center, Qianqian Zhang-Wu, Isabelle M. Lundin, Neal Lerner

The Writing Center Journal

Writing center scholars have adopted Pratt’s (1991) “contact zone” metaphor to describe the diversity of consultants and students in writing centers, but this literature has largely overlooked the perspectives of multilingual students. Through surveys, interviews, and session data, we found that while multilingual students described rich linguistic identities, they also experienced tension and instability as language users. Students often framed their considerable language assets as deficiencies in academic writing contexts. They faced additional tension between instructor expectations and their own understanding of assignment goals. Students frequently sought native-like language competency from consultants and expected them to serve as informants about …

An Entrepreneurial Approach To International Engineering Programs, Mark W. Rectanus

Journal of International Engineering Education

No abstract provided.

Efficient Task Allocation Technique For Robots In Smart Warehouse Using Center Of Items (Coi) Methodology, ‪Ahmed Yahya‬‏, Mohamed S. Saraya, Ahmed I. Saleh

Mansoura Engineering Journal

Nowadays, online shopping is very important in Daily life. in 2020 During the quarantine during the spread of COVID-19, online orders increased dramatically, as a result of the great progress in fifth-generation technologies and using the Internet of Things (IoT) and industrial Internet of Things (IIoT), industry 4.0 and 5.0, fog computing, cloud computing, robots systems, and drones systems. Smart warehouses picking system becomes a Basic need and can be implemented to improve efficiency in logistics. Smart warehouses are growing more dependent on robot systems to make the process of meeting these requests more flexible and effective. Therefore, the allocation …

The Role Of Fuzzy Logic In Cost-Volume-Profit Analysis, Ahmed Imad Abed Al-Atabe, Mohammed Wafi Abbas Al-Shammar

Muthanna Journal of Administrative and Economics Sciences

Cost-volume-profit analysis (CVP) is one of the most important basic tools in management accounting. It enables understanding the relationship between three key elements: costs, volume, and profit level. The problem with this research is that this type of analysis, in its traditional form, uses clear and fixed data, such as the variable cost per unit, total fixed costs, selling price, or sales volume, which can be accurately determined. However, these assumptions do not accurately reflect practical reality, which is often characterized by uncertainty and fluctuations. The research aims to utilize an artificial intelligence tool, fuzzy logic, as a more flexible …

The Role Of Expert Systems In Enhancing Organizational Performance In Hotel Organizations A Descriptive–Analytical Study Of The Opinions Of A Sample Of Managers And Employees In First-Class Hotels In Erbil Governorate, Dr. Hassan Odah Ghdaab

Muthanna Journal of Administrative and Economics Sciences

The study aimed to identify the role of expert systems as an independent variable with its dimensions (hardware, software, knowledge engineer) in enhancing organizational performance as a dependent variable. The research problem emerged through the need to determine the role of expert systems in improving organizational performance if adopted by managers and employees in the surveyed hotel organizations. A hypothetical model was presented to test the main and sub-hypotheses and to answer the research questions. The study focused on five-star hotels, with the research population consisting of managers and employees in hotel organizations in Erbil Governorate, specifically: (Erbil Quartz Hotel, …