Fallujah University Digital Repository service
The Digital Repository Service is a secure repository system, designed to store and share scholarly, administrative, and archival materials on behalf of Fallujah University community.
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- The Digital Repository of the University of Fallujah is a centralized platform for preserving and sharing the university's academic and research outputs. It provides access to research papers, theses, dissertations, academic publications, and other scholarly materials, fostering knowledge sharing and enhancing the visibility of the university’s contributions globally.
- المستودع الرقمي لجامعة الفلوجة هو منصة مركزية لحفظ ومشاركة مخرجات الجامعة الأكاديمية والبحثية. يوفر الوصول إلى الأبحاث العلمية، الرسائل الجامعية، الأطروحات، المنشورات الأكاديمية، وغيرها من المواد العلمية، مما يعزز تبادل المعرفة ويزيد من رؤية مساهمات الجامعة على الصعيد العالمي.
Recent Submissions
اعادة هندرة مجلس الدولة
(2025-06-25)
Optimizing Urban Thermal Comfort Through Multi-Criteria Architectural Approaches in Arid Regions: The Case of Béchar, Algeria
(Sustainability, 2025-08-25) Nahla Hilal; Radia Benziada; Malika Kacemi; Abderahemane Mejedoub Mokhtari; Naima Fezzioui; Zouaoui R. Harrat; Walid Mansour; Mohammed Chatbi; Md. Habibur Rahman Sobuz
Abstract
Urban planning in arid climates must overcome numerous nonclimatic constraints that
often result in outdoor thermal discomfort. This is particularly evident in Béchar, a city
in southern Algeria known for its long, intense summers with temperatures frequently
exceeding 45 ◦C. This study investigates the influence of urban morphology on thermal
comfort and explores architectural and digital solutions to enhance energy performance in
buildings. This research focuses on Béchar’s city center, where various urban configurations
were analyzed using a multidisciplinary approach that combines typomorphological and
climatic analysis with numerical simulations (ENVI-met 3.0 and TRNSYS 16). The results
show that shaded zones near buildings have lower thermal loads (under +20 W/m2), while
open areas may reach +100 W/m2. The thermal comfort rate varies between 22% and 60%,
depending on wall materials and occupancy patterns. High thermal inertia materials, such
as stone and compressed stabilized earth blocks (CSEBs), reduce hot discomfort hours to
under 1700 h/year but may increase cold discomfort. Combining these materials with targeted
insulation improves thermal balance. Key recommendations include compact urban
forms, vegetation, shading devices, and high-performance envelopes. Early integration of
these strategies can significantly enhance thermal comfort and reduce energy demand in
Saharan cities
Up-to-Date Review on Flat-Plate Solar Hybrid Photovoltaic Thermal Systems: Absorber Designs and Fabrication Materials
(John Wiley & Sons, 2025-06) Moustafa Al-Damook; Yassine El Alami; Elhadi Baghaz; Rehena Nasrin; Rachid Bendaoud; Tarik Bouragba; MustaphaMelhaoui; Mohammadi Benhmida
Photovoltaic (PV) technology is generally perceived as well-developed but suffers a drop in performance at high temperatures.
Faced with this problem, researchers are turning to PV thermal (PVT) systems, which integrate electricity production and thermal
energy. Flat-plate PVT systems are the most widely adopted among the various configurations. This article is distinguished by an
in-depth analysis of flat-plate PVT systems, drawing on a detailed analysis of recent research. It summarizes the numerous studies
on the different layers of PVT systems, providing an overview of advances in this field. The materials used for absorbers and tubes
are explored, providing information on their properties and applications and on the research being carried out to optimize their
efficiency. The analysis also focuses on heat exchanger, tube, and channel configurations, highlighting innovations to improve their
performance. Methods for integrating absorbers and tubes with PV panels, the most efficient types of PV cells, and working fluids
for optimizing heat transfer and thermal performance are also discussed. Finally, an overview of software tools for simulating PVT
systems and a summary of research on each software tool are provided to help researchers select the most appropriate tools for
their modeling. Recommendations for further improvements to the viability of these systems are also provided
Computational neutron emission spectrometry and radiation assessment in VVER-1200 reactor nuclear fuel
(Elsevier, 2025) Ahmed H. Ali; Sergey V. Bedenko; Gennady N. Vlaskin; Sergey D. Polozkov; Alexey A. Orlov; Hector Rene Vega-Carrillo
To ensure long-term and trouble-free operation, the reactor fuel is modified by introducing various homogeneous
and heterogeneous additives. This modified fuels exhibit satisfactory performances under irradiation at elevated
temperatures and burnup levels. However, the challenges related to radiation safety during the handling of fresh
and spent nuclear fuel remain unresolved. In this study, neutron emission spectra and effective doses for VVER-
1200 reactor fuel containing a heterogenous distribution of natGd2O3 and Am2O3, microspheres were calculated.
Unlike in the case of homogenous variants, this design did not reduce the thermal conductivity of the fuel and
positively affected the core neutronics and thermophysics. Comparing the radiation characteristics of fresh FAs
revealed a considerable increase in the neutron (more than 3.7•102 times at a distance of 10 cm from the FA) and
photonic (about 104 times) components of Am–containing fuel compared to U and U–Gd fuels. The yield and
effective dose of neutrons emitted from spent Am-containing fuel is two times higher than that of uranium–based
fuels. When calculating the dose, it is important to consider the energy spectrum of (α, n) neutrons in Am2O2
microcapsules. The findings of this study provide insights into the development of procedures and regulations for
manufacturing and post-irradiation handling of new fuel in reactors.
Mechanical properties of novel green high-strength fly ash concrete incorporating hemp fibers
(Elsevier, 2025) Aktham H. Alani; Hussein Ghanim Hasan; Megat Azmi Megat Johari; T.A. Majid; N. Muhamad Bunnori
Cement production rose in the late 20th century. In response to environmental concerns, green
concrete research and development have risen. The use of fly ash as a cement substitute in green
concrete remains limited, despite global studies. This study aimed to investigate the feasibility
and advantages of utilizing hemp fiber on the mechanical properties of high-strength green
concrete (HSGC) containing different volumes of fly ash (FA). Hemp fibers were added at 0.5 %
and 1 % of the total mixture volume, in combination with varying levels of FA (0, 10, 17.5, and
35 %) as a partial replacement material for the total volume of Ordinary Portland Cement (OPC)
binder in the HSGC. Slump flow diameter and T50 slump flow were performed to assess the
rheological properties of fresh concrete mixtures. The results show that even with a 35 % FA
content, the flexural properties and ductility behavior of HSGC were significantly improved by
the combined use of FA and hemp fiber at 28 days. The superior increase in compressive strength,
splitting tensile strength, flexural strength, flexural toughness, and ductility was achieved with
hemp-fiberized HSGC containing 17.5 % FA and 1 % hemp fiber by 22.3 %, 49.81 %, 14 %, 50.8
%, and 28 %, respectively, relative to the control mix. Thus, hemp fiber could extend fly ash use in
HSGC production, reducing cement demand and energy consumption while improving concrete
sustainability.