Physical Sciences and Mathematics Commons^™

Data-Driven Mathematical Modeling And Simulation Of Migration Dynamics During The Russian-Ukrainian War, Danielle Sitalo, Alonso Ogueda-Oliva, Padmanabhan Seshaiyer

Spora: A Journal of Biomathematics

In this work, we employ a governing system of ordinary differential equations (ODEs) to create a mathematical model for getting insights into the dynamics of migration of Ukrainians evacuating due to war. A suitable assumption on coefficients of this model results in the well-known logistic growth. Additionally, stability analyses of equilibrium solutions for these ODEs are performed, and we employ parameter estimation techniques to identify coefficients using online datasets via both a least-squares approach as well as a physics informed neural network approach. Our findings indicate that over time, the daily influx of Ukrainian refugees to Poland stabilizes at a …

Performance Studies Of An Axial Flow Waterjet Pump Using An Unsteady Reynolds-Averaged Navier-Stokes Model, Stephen E. Monroe, Junfeng Wang, Chunlei Liang

Northeast Journal of Complex Systems (NEJCS)

In this study, an Unsteady Reynolds-Averaged Navier-Stokes (URANS) model is demonstrated its suitability for studying the flow and performance of open marine propellers and waterjet pumps. First, the accuracy of the URANS model is validated by studying turbulent flow past counter-rotating propellers (CRPs). Specifically, experimental data from Miller (1976) is employed for comparison against the URANS results. Subsequently, URANS is used to study the flow and performance of an Office of Naval Research (ONR) axial flow waterjet pump (AxWJ-2). Due to the large number of degrees of freedom for both simulations, parallel computations over 80 cores are performed. For the …

Analysis Of The Effect Of Vaccination, Efficient Surveillance And Treatment On The Transmission Dynamics Of Cholera, Loyinmi Adedapo Chris, Ajala Adebisi Shukurat, Alani L. Ijaola

Al-Bahir Journal for Engineering and Pure Sciences

In this study, we presented a modified SIR-SI model to investigate the dynamics and potential controls for cholera transmission, with an incident rate equipped with a saturation factor to investigate the combined impact of three vital measures which include effective surveillance, vaccination campaign and proper treatment in case severity. We established among other things, the qualitative analysis of the model to validate the results. Furthermore, the reproduction number (R0) was found to be less than unity (1), through the stability analysis. Additionally, finite different scheme was utilized in solving the differential equations of the model. MATLAB software was used for …

Mathematical Modeling, Analysis, And Simulation Of Patient Addiction Journey, Adan Baca, Diego Gonzalez, Alonso G. Ogueda, Holly C. Matto, Padmanabhan Seshaiyer

CODEE Journal

This paper aims to develop a mathematical model to study the dynamics of addiction as individuals go through their detox journey. The motivation for this work is three fold. First, there has been a significant increase in drug overdose and drug addiction following the COVID-19 pandemic, and addiction may be interpreted as a infectious disease. Secondly, the dynamics of infectious disease could be modeled via compartmental models described by differential equations and one can therefore leverage the existing analytical and numerical methods to model addiction as a disease. Finally, the work helps to inform how mathematical models governed by differential …

The Bioremediation Effect Of Microalgae On Wastewater: A Green Technology Approach, Mohamed Ahmed Reda Hamed Dr, Marwa Abdelfattah Abdallah Dr

Journal of Engineering Research

The present study lays an emphasis on the microalgae-based for simultaneous wastewater bioremediation using Chlorella vulgaris and Micrococcus luteus mixed algal cultures to remove its constituent pollutants, amazing green technology guarantees benefits with the decrease in the formation of dangerous solid sludge. Ten days of fully monitoring laboratory experimental program were performed in batch cultures to investigate the effect of various dominant mixing ratios for attaining wastewater concentrations and different governing temperature ranges on the performance of microalgae treatment. The results revealed that there is a significant impact of both wastewater concentrations and temperature treatment conditions on the capability of …

Unlocking The Potential Of Rooftop Sustainable Systems: Understanding Barriers And Facilitators, Mahmoud Desouki, Taghreed A. El-Haddad

Journal of Engineering Research

Urbanization is reducing green spaces in old cities globally, including Egypt, adversely impacting air quality, climate, and psychological well-being. The rooftop has the potential to offer viable alternatives that provide multiple benefits. They can host sustainable systems, and foster social activities. Despite these advantages, their adoption in cities like Tanta the Egyptian city, one of the world's most densely populated cities with a shrinking per capita green space, remains limited. Most rooftops are often serving as dumping grounds for trash and unused items. This study aims to explore the reasons behind this underutilization to find ways to encourage the use …

Indicators And Evidence Of Environmental Sustainability For Pedestrian In Public Parks (Towards An Approach For Formulating A Guideline Evaluation Model), Nashwa Youssif

Journal of Engineering Research

يتناول البحث أحد المجالات التي فرضت تواجدها في الأونة الأخيرة علي الساحة العلمية والبحثية التي تتعلق بالعلاقة التبادلية التأثير بين الإنسان والفراغ العمراني حيث يتنامي الإهتمام بالخصائص الإنسانيه و مدي توافقها مع هذا الفراغ العمراني.

وتعد مسارات المشاة من أهم الحيزات العمرانية التى تشكل النسيج العمراني وأحد أهم وسائل التواصل الإجتماعي والثقافي والوظيفي نظرآ لإرتباطها بالغالبية العظمي من أفراد المجتمع، ومساعدتها على جذب العديـد من الأنشطة داخل الحدائق العامة. مما يشير إلي ضرورة الإهتمام بتحسين بيئة حركة المشاه كمدخل للتواصل والإستدامة.

ومن هنا تتمثل مشكلة البحث في نقص الدراسات حول تقييم العلاقة بين معايير الاستدامة التصميمية والنظم البيئية لمسارات المشاة …

Hypogene Speleogenesis In Carbonates By Cooling Hydrothermal Flow: The Case Of Mt. Berenike Caves, Israel, Roi Roded, Boaz Langford, Einat Aharonov, Piotr Szymczak, Micka Ullman, Shemesh Yaaran, Boaz Lazar, Amos Frumkin

International Journal of Speleology

The Berenike hypogenic cave system near Lake Kinneret, Israel, provides a valuable case study for investigating the recently proposed Confined-Cooling-Flow (CCF) speleogenesis model. Field and speleological surveys, along with existing research, are used to provide a thorough analysis. The CCF model relies on a simple thermo-hydro-chemical scenario, involving the rise of CO2-rich hydrothermal fluids discharging into a confined layer. The cooling of these CO2-rich fluids turns them into aggressive solutions due to the inverse relation between temperature and solubility of carbonates (retrograde solubility). Previous geochemical and numerical analyses of the CCF model predict localized and persistent dissolution and speleogenesis on …

Uniformly Distributing Points On A Sphere, Flavio Arrigoni

Rose-Hulman Undergraduate Mathematics Journal

In this paper, we are going to present and discuss different procedures for distributing points on a sphere's surface. Furthermore, we will assess their quality with three different distribution tests. The MATHEMATICA package that we created for testing and plotting the points is publicly available.

Modeling Virus Diffusion On Social Media Networks With The Smirq Model, Justin Browning, Arnav Mazumder, Gowri Nanda

Rose-Hulman Undergraduate Mathematics Journal

As social networking services become more complex and widespread, users become increasingly susceptible to becoming infected with malware and risk their data being compromised. In the United States, it costs the government billions of dollars annually to handle malware attacks. Additionally, computer viruses can be spread through schools, businesses, and individuals’ personal devices and accounts. Malware affecting larger groups of people causes problems with privacy, personal files, and financial security. Thus, we developed the probabilistic SMIRQ (pSMIRQ) model that shows how a virus spreads through a generated network as a way to track and prevent future viruses. Our model is …

Approximating Equilibria In Restricted Games, Jack W. Doyle

Rose-Hulman Undergraduate Mathematics Journal

We consider optimal play in restricted games with linear constraints, and use ϵ-equilibria to find near-equilibrium states in these games. We present three mathematical optimization formulations -- a mixed-integer linear program (MILP), a quadratic program with linear constraints (QP), and a quadratically constrained program (QCP) -- to both approximate and identify these states. The MILP has a short runtime relative to the QP and QCP for large games (a factor 100 faster for |S|=9) and exhibits linear growth in run time, but provides only relatively weak upper bound. The QP and QCP provide a tight bound and the precise value …

Employing Interactive Architecture Techniques In Architectural Design Methodologies To Retrieve Ancient Egyptian Identity, Dina Elwy Aly Hamed Hussein Dr. Lobna Abd-Allah Abd-Elfattah Agha , Dr. Azza Sobhi Ragab Elsakka

Journal of Engineering Research

Architectural projects often rely on modern technologies like smart architecture and environmental treatments, neglecting the principles and philosophy that reflect civilization, ideas, culture, and traditions. This leads to short-lived buildings that depend on these technologies without any purpose of preserving them. Technicians must constantly renew technology to improve production and without benefits, as threats of superior artificial intelligence have been warned, that autonomous machines may perform tasks without programmers understanding how to reach this level. Instead of relying solely on environmental or smart technology, we should make technology serve the design idea rather than relying solely on it. Considering this, …

The Effect Of Lighting In Color In The Interior Space Of The Residential Unit, Abd Elbary Eldininy Abd Elbary Eldininy

Journal of Engineering Research

ABSTRACT: Humanity is spending more and more time indoors, both at work and at home - with studies showing that we now spend 87% of our lives indoors. Residential environ ments both positively affect the mood and well-being of its occupants, just as places with poor and uncomfortable lighting and colors can make life miserable. This is why we are interested in this issue. The importance of knowing the issues of lighting and colors in order to obtain a well thought-out interior design. The interior designer has the ability to control in the quality of lighting of various types, artificial …

Green Facade Strategy To Mitigate Heat Islands, Arch. Aya Gamal Abdel Hamid Muhammad Prof. Mai Wahba Madkour... Dr. Rania Elghamry Ashmawy Tolba Elakab

Journal of Engineering Research

In the beginning of the twentieth century and the occurrence of the economic crisis that accompanied by a climate crisis, that one of its indicators the rise in temperatures and the formation of hot zones, especially in crowded cities, including Cairo in particular, as it is considered one of the crowded cities in the world, and this noticeable rise in temperatures in Some areas where hot zones form are called heat islands. This results because of the nature of the urban environment, which has a high building density, little natural landscape, and human and industrial activities that has a negative …

Light Structure Building Technology Towards Sustainable Environmental Design, Sally El-Sayed Prof. Dr. Mai Wahba Madkour2, Prof. Dr. Marwa Ahmed Kamer El-Dawla3

Journal of Engineering Research

The building and construction industry is one of the most important sectors globally , as it plays a vital role in providing housing and infrastructure that meets the needs of various communities , However , this industry is considered one of the largest contributors of negative environmental impacts in terms of consuming huge amounts of natural resources in an unsustainable manner and a subsequent increase in energy consumption .Therefore, it was necessary to find solutions and explore for new and sustainable construction methods to alleviate these problems .This research paper will focus on the use of light buildings and their …

Available Building Technology As A Tool For Developing Construction And Structure Systems., J. Q. . Nader Ibrahim Ismael

Journal of Engineering Research

The research aims to study the impact of available building technology in each era in the development of the constructional thought and implementation techniques used and its impact on the development of different types of buildings, through the emergence of different types of buildings and the development of buildings types in terms of shape and height, through the development of building materials used Whether construction materials or finishing materials, as well as used construction techniques and equipment, and the impact of all on the development of construction thought and construction systems through different eras . The research also represents an …

Increasing Occupancy Rates In Coastal Tourism Development At The Regional Level In Support Of A Sustainable Quality Of Life In Egypt, عبدالرحمن محمد عبدالقادر موسي

Journal of Engineering Research

إن استغلال الفراغات التي تمثل أكثر من 80% من مساحة المنتجعات السياحية الساحلية في الأنشطة الرياضية والترفيهية والثقافية والاجتماعية وتوفير الخدمات المختلفة عن طريق دعم الخدمات الإلكترونية التي تساعد الزائرين في قضاء وقت أكبر بتلك القري السياحية، مع تعلم السباحة وركوب الدرجات والتجديف والتسلق وركوب الخيل دعما لجودة الحياة ، حيث التمتع بالهواء المتجدد القادم من البحر بعيدا عن التلوث والضوضاء، ولزيادة الاستفادة والدعم يتم توفير وحدات فندقة لغير الملاك لزيادة الزوار والاتفاق مع المدارس والجامعات لتنشيط تلك الرحلات للشواطئ وممارسة الأنشطة المميزة لهؤلاء الشباب والاستفادة من الخدمات الجيدة والفراغات الصحية والهواء المتجدد وتعلم الرياضات الشاطئية المفيدة وذلك الاتجاه من …

Enhancing Daylight Using Sustainable Natural Lighting Techniques In Modern Architecture, سارة حسني شعلان أ.م.د/ لبني عبد الفتاح أغا

Journal of Engineering Research

Natural lighting is one of the basic criteria for the architectural design process. It is one of the most important data that contributes to the design of architectural spaces and the manifestation of aesthetic values. In light of the global technological development and the scientific and information revolution, the role of the architect comes in highlighting the importance of natural lighting and its positive role in human biology, and reducing effort and psychological pressure in the event of Its use is an alternative to artificial lighting, as it increases human efficiency and achievement at work, in addition to giving a …

Green Architecture Strategies To Achieve Sustainability In Buildings, Azza Sobhi Ragab Elsakka J. Q. Assos., Menna Ashraf Saeid Ali

Journal of Engineering Research

في الوقت الحالي توجد حاجة مُلحة لتطبيق معايير الاستدامة التي تعني المحافظة على الموارد الحالية و استخدامها بحيث لا تقل استفادة الأجيال القادمة من تلك الموارد ، و للاستدامة عدة جوانب لتطبيقها أحد تلك التطبيقات هي العمارة الخضراء ، العمارة الخضراء مرت بعدة مراحل بدءاً من القرن السابع عشر ( منذ العصر العثماني الاسلامي ) من خلال وجود بعض الأساليب الغير مباشرة في التصميم التي توفر التهوية و الإضاءة الطبيعية و حتى عصرنا هذا، حيث وُجد تقييم لأداء المبنى الأخضر من حيث أسلوب التصميم و الإنشاء بحيث لا يؤثر على البيئة تأثير سلبي و ما زال التطوير مستمر في إنشاء …

The Impact Of Green Infrastructure On Urban Heat Island Phenomenon In Existing Cities, Neveen Youssef Azmy Basant Elsayed Abu-Farrag, Walaa Abou El-Haggag Mehanna

Journal of Engineering Research

Rapid urbanization and overpopulation, along with a lack of green space, led to an increase in air temperature, lowering the rate of thermal comfort in dense urban areas, decreasing air quality, and increasing the urban heat island (UHI) phenomenon, particularly in existing cities. As a result, the research aims to reduce the UHI effect and improve the thermal performance of existing Egyptian cities by adopting green infrastructure (GI) principles and demonstrating their effectiveness on the UHI phenomenon. This research concentrates on the UHI phenomenon as one of the environmental issues facing urbanization and includes a review of green infrastructure (GI) …

Optimizing Fenestration Systems In Residential Buildings: A Parametric Analysis Of Egyptian Energy Codes' Impact On Thermal Comfort, Wafik El-Menshawi Ali F. Bakr , Amira A.Fathi

Journal of Engineering Research

- Fenestration systems, such as windows, doors, and skylights, play a crucial role in improving thermal comfort and reducing energy consumption in buildings. In Egypt, the energy code establishes standards for fenestration systems to promote energy efficiency and carbon emission reduction. Residential buildings account for a significant portion of total energy consumption, making the optimization of fenestration systems essential. This research focuses on studying the optimization of fenestration systems in Egyptian residential buildings through parametric analysis, considering energy standards and their impact on total energy gain and thermal comfort. The paper examines existing energy codes for fenestration systems and explores …

Towards Green Cities As An Approach To Achieve Climate Change Adaptation, Noha H. Hefnawy Nouran M. Ibrahim

Journal of Engineering Research

Climate change is a complicated problem and there is an urgent need for climate change adaptation. Cities are the primary drivers of social, economic, and technical progress. Green Cities are cities that show high environmental performance relative to adapting risks derived from climate change while maximizing the economic and social co-benefits. The Authors adopted a data collection strategy to review the issues, and difficulties caused by climate change and how green cities could assist in addressing them, then adopted a case study analysis to analyze the strategies used by Sharm El Sheikh in the transition to green city. The study …

Using Recycled Materials Towards Sustainable, Eco-Friendly Building In Hot Regions – A Review, Mai W. Madkour Hosny A. Dewer, And Shaimaa M. Refaat

Journal of Engineering Research

Due to population growth and increased urban activity, there is a rise in waste production, which poses health and environmental risks. Additionally, the extraction and transportation of natural resources to places of employment require significant energy consumption, and the world has therefore moved to seek new alternatives away from traditional construction methods by recycling building materials such as concrete, brick, glass, wood, etc., or using new building materials such as rice straw, plastics, corks, etc., taking into account architectural design. The research is aimed at demonstrating that recycled materials have the potential to perform a better environmental performance by preserving …

Sustainable Design Of Open Service Spaces In Universities (The American University In Cairo As An Example), مصطفى منصور عبد المجي أ.م.د. زينب لطفى عبدالحكيم خليفة

Journal of Engineering Research

إن الجامعات المستدامة تعد اتجاهاً مستقبلياً معاصراً لابد أن تحرص مؤسسات التعليم العالي على تبني مبادئه، ووضع خارطة طريق مستقبلية، وتتطلب استدامة الجامعات مواجهة الكثير من التحديات الجغرافية لضمان توفير بيئة آمنه ومريحة مع الحد الأدنى من الهدر، وإيلاء اهتمام خاص لاحتياجات الطلاب وجميع العاملين بالجامعة، والقدرة على تخطيط وإدارة الحيزات الخدمية المفتوحة بها وإقامة المنشآت المستدامة.

Agile Vs Waterfall As An Approach For Effective Management Practices In Fit Out Projects (Preferences Of Project Managers), Moutaz M. El Baz 1

Journal of Engineering Research

Optimum time, cost & quality are the key objectives in managing fit-out projects. Waterfall and Agile are the most common approaches for achieving the project objectives. To determine the optimal managerial approach for fit-out projects, it was essential to study the project life cycle & phases, waterfall & agile methodologies & phases and the project management performance indicators. To achieve the research goals, a data gathering/analysis performed among three steps. Firstly, by performing qualitative research through semi-structured interviews with project management experts to verify the research hypothesis. Secondly, through studying the project & project management life cycle, phases and characteristics …

Improving Home Designs For Disease Prevention In Gated Communities And Satisfying Living Space Needs In Egypt: A Post-Pandemic Living Assessment, A. Moustafa Kamel Neveen Youssef Azmy, Shahira Sharaf Eldin

Journal of Engineering Research

Abstract Pandemics such as SARS and COVID-19 have highlighted the importance of preventing and controlling diseases. Virus transmission in residential buildings, especially multi-unit apartment complexes, has prompted calls for innovative housing designs. While Western countries prioritize physical and mental health in residential building design, China focuses on comfort, aesthetics, appearance, and lifestyle.

Studying The Problems Of Delayed Receipt Of University Buildings In Egypt During The Corona Pandemic, أ.د / مروه قمر الدولة أ.د / لبنى أغا

Journal of Engineering Research

على الرغم من وجود العديد من الدراسات السابقة في مجال تأخير مشاريع البناء. إلا أن هناك أبحاث محدودة جدًا تتناول تأثير كورونا على عوامل تأخر مشاريع البناء. وعليه فإن هذا البحث يتناول آراء المتخصصين حول تأثير جائحة كورونا على العوامل المسببة للتأخير في عملية البناء في مصر. ومن المتوقع أن تساهم نتائج هذا البحث في دراسة العوامل المسببة لهذا التأخير ومحاولة تقديم بعض التوصيات التي تساهم في وضع الخطط المستقبلية لمواجهة الظروف الاستثنائية المماثلة، يهدف هذا البحث إلى قياس أهمية العوامل المسببة للتأخير في عمليات البناء في مصر على مستوى المباني الجامعية بعد جائحة كورونا، وللوصول الى ذلك الهدف اتخذت …

Design Characteristics Of The External Envelope Of Modern High-Rise Buildings In Egypt: Concepts And Indicators Of Energy Performance, حازم عز الدين قاسم ، نوبى محمد حسن، مصطفى محمد سيد

Journal of Engineering Research

إعتمدت الدولة المصرية فى الآونة الأخيرة نمط المبانى العالية فى مخططاتها لمراكز مدن الجيل الرابع الجديدة الجارى إنشاؤها فى العديد من المناطق، وذلك فى إطار سعى الدولة لتغيير الخريطة العمرانية والتوسع في الإستثمار العقاري وخلق مجتمعات مواكبة للتطور العمراني والتكنولوجي بما يتوافق مع رؤية مصر٢٠٣٠، ومع البدء فى ظهور وإعتماد العشرات من مشروعات المبانى العالية فى مصر، أصبح من الضرورى دراسة تصميم الغلاف الخارجى لتلك المبانى ومدى ملاءمته للمناخ والبيئة المحلية، وذلك بهدف الوصول لأفضل أداء للطاقة وأعلى كفاءة للإستهلاك.

The Design Of The Outer Casing Is Compatible With The Hot Climate Environment, حازم عز الدين قاسم نوبى محمد حسن مصطفى محمد سيد

Journal of Engineering Research

تعتبر المبانى العالية أحد أقل أنماط المبانى توافقاً مع البيئة والمناخ، وذلك بسبب إنعزالها عن النسيج العمرانى المحيط وتعرضها للعديد من العوامل المناخية بشكل أكبر من المبانى المنخفضة، لذا يعتبر الغلاف الخارجى هو العنصر الأهم فى تصميم المبنى العالي لكونه بمثابة الجدار الفاصل بين البيئة الخارجية ذات الظروف المناخية القاسية وبين البيئة الداخلية التى يجب الوصول فيها لراحة المستخدم الحرارية، حيث يعد الغلاف الخارجى هو المسئول عن ما يقرب من 60% من إجمالى الطاقة التى يستهلكها المبنى العالى وذلك فى أعمال التبريد والتهوية الصناعية [1].

An Analytical Study Of Key Performance Indicators For Knowledge Management In Construction Companies, Marwa. M. Ahmed Ayman A.E. Othman, Essam Eldin. K. Mahrous

Journal of Engineering Research

The construction and building industry plays a pivotal role in both national and global economies, necessitating a focused approach in knowledge management (KM) strategies amid current market disruptions and economic uncertainties. For construction companies to plan and develop effective KM strategies, they must be measured and incorporated within the key performance indicators (KPIs) relevant to construction companies. This research paper aims to review literature on knowledge management performance indicators (KM PIs) and rank their importance within the KPIs of contracting companies. Statistical analysis revealed that previous studies neglect KM PIs, such as, as some important techniques for KM, such as …