Journal of Engineering

The study investigates the aerodynamic characteristics of the supercritical RAE2822 airfoil with a Gurney flap using computational fluid dynamics (CFD). The research analyzes the effects of different Gurney flap heights (1%c, 2%c, and 3%c) and mounting angles (30°, 45°, 60°, 75°, and 90°) on the lift and drag coefficients. The results indicate that increasing the Gurney flap height enhances the lift coefficient and shifts the shock waves downward, while the drag coefficient increases for positive angles of attack and decreases for negative angles of attack. The study validates the computational results with experimental data, showing good agreement.

This research proposes new processor designs for addition using optical tri-state gates. The Basic Arithmetic Unit (BAU) is built using a three-step approach that uses optical gates with three states to configure the circuitry for addition, subtraction, and multiplication. The design can achieve multiple addition operations with an operand length of n bits simultaneously. The three steps of adding a BSD are numerically simulated, and the constructing process is thought to be more precise and faster because the time to add does not depend on the length of the word. A simulation model for six addition processes with a total bit count of 15 bits is presented in this work performing in a one-time parallelism manner.

The study investigates the critical strains under different water contents through uniaxial compressive strength tests on 11 different shale and marl samples. A comparison of laboratory tests and numerical results shows that the influence of the moisture content on the critical strain is negligible. Additionally, the results show that there is no direct relationship between the critical strain and uniaxial compression strength.

This research investigates manganese (Mn) extraction from Electric Arc Furnace Steel Slag (EAFS) by using the Liquid-liquid extraction (LLE) method. The chemical analysis was done on the slag using X-ray fluorescence, X-ray diffraction, and atomic absorption spectroscopy. The study consisted of two parts: the first part studied the effect of variables on the leaching process rate for Mn element from slag (reaction time, nitric acid concentration, solid to liquid ratio, and stirring speed), and the second part evaluated the extraction of Mn element from the leached solution. The results showed that 83.5% of Mn element could be leached from the slag at 25°C, nitric acid concentration 2 M, time 90 min, solid to liquid ratio 1/100, and stirring speed 700 rpm. Additionally, 94.7% extraction of Mn was achieved from nitric acid solutions using Octyl Pyro Phosphoric Acid (OPPA) in kerosene at contact time for 12 min, 50%OPPA - kerosene, stirring speed 900 rpm, and organic to aqueous phase (O/A) ratio of 4/1

A fixed firefighting system is a key component of fire safeguarding and reducing fire danger. It is installed as a permanent component in a structure to protect the entire or a portion of the building and its contents. The study aims to review the previous studies that deal with the evaluation of fire safety measures and their use in resolving problems associated with fire threats in buildings. For this reason, a number of previous studies in this field were reviewed compared with the NFPA code. The findings revealed that regulatory developments over the last several decades had created an atmosphere conducive to innovation. This has resulted in a growth in the number of fixed firefighting system types now obtainable. These solutions provide substantial distinction in terms of performance and hence safety. Not only is the availability of different fire risk alleviation systems important, but so is the election of the most convenient solution for the job. This is typically seen inside regulatory procedures and basics of thumb or heuristics and depends on the knowledge and expertise of divergent specialists. When several perceived danger and results thresholds are surpassed, fixed firefighting systems are frequently included as extra fire protection and resilience measures

Roller compacted concrete (RCC)is a material with no slumps and is made from the same raw materials as conventional concrete. The roller compacted dammethod, the high paste technique, the corpsof engineers method, and the maximum density methodare all ways ofdesigning RCC. The evolution of RCC has resulted in a substantial change in construction projects, most notably in dams, because of the sluggish pace of conventional placement,consolidation, and compacting. The construction process was accelerated by incorporating RCC into dams, resulting in a shorter construction period. Research shows that the dams that used RCC had completed one to two years sooner than the dams that used regular concrete(Bagheri and Ghaemian's, 2004). The application of RCChas risen significantly during the past several decades, particularly for pavementapplications.It has a lower construction cost than asphalt and may be completed fast. It is extensively used in areas/roads that transport big goods at moderate speeds.RCC is increasingly being used in metropolitan areas, particularly on roadways andstreets. RCC has shown great interest inasphalt roads in terms of durability, compressive strength, prolonged service life, and lower maintenance costs. Fibreaddition is frequently favored in RCC, just as in traditional concrete. Fiber inclusion contributes to the mechanical qualities of RCC as well as its long-term sustainability.Within the focus of this research, RCC is reviewed based on four factors: environmental effect, cost, fiber addition, and country-specific RCC use. This study is unusual in this sense and provides researchers with valuable information.