بحوث سكوبس — مرزة كريم عمران

Designing armor units that can withstand harsh marine environments while remaining cost-effective is a central challenge in modern breakwater engineering. This study introduces a newly designed artificial armor unit and evaluates its performance in comparison with established alternatives such as the accropode, core-loc, and conventional rock armor. The findings reveal that the new unit achieves a lower packing density, reducing the number of units required and thereby improving overall cost-effectiveness. Armor layers formed from the newly designed unit exhibited higher porosity than accropode but lower than core-loc, effectively avoiding the slender geometries that compromise durability. Structural analysis using STAAD.Pro confirmed that the new unit developed lower tensile stresses, with reductions of 15% compared to accropode and 35% compared to core-loc under flexure, torsion, and combined loading, demonstrating superior integrity. Hydraulic stability tests showed that the randomly placed newly designed units resisted failure at a stability number (Ns) of 1.4, lowering run-up by 50% and overtopping by 59%, while the uniformly placed newly designed units reached 1.5 without failure, with run-up and overtopping reductions of 30% and 37%, respectively. Collectively, these outcomes highlight the clear hydraulic and structural advantages of the new design over conventional systems, establishing it as a stronger and more resilient solution for breakwater protection. © 2026 by the authors.

Mineral filler is a mineral fine particle that passes through the No.200 sieve which plays a critical role in the performance of Hot-Mix Asphalt (HMA) mixes. A better understanding of how fillers affect the characteristics of HMA mixes is critical for good mix design and higher HMA performance. The main objective of this paper is to assess the impact of mineral filler on the mechanical characteristics of HMA using the Marshall mix design method. For this purpose, two different mineral filler types, namely, limestone and ordinary Portland cement (OPC) with three filler contents were utilized to prepare asphalt mixture samples. Optimum asphalt content was determined by the Marshall mix design method using six different asphalt contents (4.0%, 4.5%, 5.0%, 5.5%, 6.0%, and 6.5%). In this paper, the characteristics of two kinds of filler were assessed using three experimental tests: Marshall test, retained strength test, and indirect tensile strength test. This study considered three filler percentages: 4, 7, and 10% by aggregate weight. These percentages fall within the limit specified in the SCRB specification (SCRB, R/9, 2003). The results indicated that HMA containing cement filler resulted in higher stability levels, tensile strength, and index of retained strength values compared to the limestone dust. Therefore, the utilization of cement filler provides better performance for asphalt mixes. The addition of cement filler with 10 % and limestone filler with 7 % seem to be the optimum filler contents due to satisfying all SCRB specification requirements. © 2024 American Institute of Physics Inc.. All rights reserved.

Today, a unique method of treating environmental contaminants is drawing considerable attention. Organic dyes are significant wastes from myriad industries, including paper, food, and textiles, which have become a serious environmental concern and have the potential to be toxic to humans and living organisms. This study demonstrates the fabrication and characterization of thulium vanadate (TmVO4) nanostructures and TmVO4/Fe2O3 nanocomposites that were effectively applied in the photodecomposition efficiency of cationic and anionic organic contaminants. The TmVO4/Fe2O3 nanocomposites were prepared through a sonochemical method, and triethylenetetramine (TETA) was employed as a precipitating and capping agent. The tests were performed using a probe as a sonication source (60 W, 18 kHz). The impact of TmVO4 content (5, 10, 15, and 30%) on the modification of binary nanocomposites was studied in terms of morphological, optical, and photocatalytic properties. The recyclable magnetic TmVO4/Fe2O3 nanocomposites with 15% TmVO4 achieve 68.3% of eriochrome black t (EBT) utilizing visible origin. More notably, the binary TmVO4/Fe2O3 nanocomposites reveal higher photocatalytic activity than the pure TmVO4 and Fe2O3 nanoparticles. © 2022 Hydrogen Energy Publications LLC

Herein, the as-prepared ErMnO3/ErMn2O5/CuO/g-C3N4 nanocomposite is used for H2 storage. This product is synthesized during two steps: in-situ synthesis of ErMnO3/ErMn2O5/CuO (NC-1), and adding g-C3N4 to prepare ErMnO3/ErMn2O5/CuO/g-C3N4 nanocomposite (NC-2). ErMnO3 emerges in the form of ErMnO3/ErMn2O5 (EMO/EMMO) at calcination temperatures <1200 °C. Two-dimensional structure of EMO plays a substrate for deposition of EMMO, CuO and g-C3N4. The results show that presence of CuO has no effect on the optical property of EMO/EMMO while adding g-C3N4 affects it and of course the band gap increases by agglomeration of the particles deposited on the EMO. Changing the magnetic properties in every change-step is notable. EMO represents a ferromagnetism characteristic that is altered to paramagnetic when NC-1 is prepared, and NC-2 presents a ferromagnetism behavior. Furthermore, the results show that CuO and g-C3N4 are used as boosters to increase H2 storage capacity of EMO/EMMO. © 2022 Hydrogen Energy Publications LLC

Crushed waste concrete (CWC) has been added to soil subgrades with inadequate natural stability to evaluate how it affects their behavior. The soils were mixed with various percentages of crushed waste concrete 0 %, 25 %, and 50 %, which were selected based on previous studies. Natural clay soil (Neat Soil)-crushed waste concrete CWC mixes were compacted at the optimum water content and then subjected to a variety of laboratory tests. The results revealed that soil samples stabilized with CWC improved significantly in terms of swelling pressure, maximum dry density, and California Bearing Ratio (CBR). The swelling pressure decreased by increasing CWC contents for all samples and the maximum dry density value, CBR value of Blend Soil (X1, X2) samples increased with increasing CWC contents. Therefore, the CWC is a valuable material for modifying the properties of soil in order to make it appropriate for construction. Based on the results analysis, mix designs containing 50 % CWC and 50% silty clay soils were found to be appropriate for use as sub-base material. © 2023 American Institute of Physics Inc.. All rights reserved.

Although theoretical models of manufacturing processes are useful for understanding physical events, it can be challenging to apply them in real-world industrial settings. When huge data are accessible, artificial intelligence approaches in the context of Industry 4.0 can offer effective answers to real production challenges. Deep learning is increasingly being used in the realm of artificial intelligence to address a variety of issues relating to information and communication technology, but it is still limited or perhaps nonexistent in the industrial sector. In this study, wire electrical discharge machining—a sophisticated machining technique primarily used for computer hardware components—is applied to effectively forecast unforeseen occurrences. By identifying hidden patterns in process signals, anomalies, such as changes in the thickness of a machined item, may be efficiently anticipated before they occur. In this study, a model for anomaly detection in the sequence of thickness change in the machined component based on transformers is suggested. Our method is able to achieve 94.32 % and 94.16 % accuracy in Z 135 and Z 15 datasets, respectively. Also, it forecasts the abnormalities inside the sequence 1.1 seconds in advance, according to our tests on a dataset that has been introduced © 2022, Majlesi Journal of Electrical Engineering.All Rights Reserved.