Search

Aluminum composites are preferred in many kinds of applications such as aviation, space, automotive, and marine, owing to their outstanding properties, high strength, and corrosion resistance. The main objective of the current study is to evaluate the mechanical properties of aluminum alloy 6061/titanium dioxide (micro-TiO2) microcomposite synthesized using the stir casting method. The effects of changes in stir casting parameters, such as stirring speed and tiring durations, were studied. Al6061 matrix was reinforced with micro-TiO2 particles with weight fractions of 1, 2, 3, 4, and 5 wt.%. Microstructural and chemical analyses were conducted to explore microstructural transformation resulting from the presence of the TiO2 microparticles. The mechanical characteristics were evaluated, and the results showed a considerable enhancement in the mechanical strength and hardness resulting from the incorporation of micro-TiO2 into Al606. The additions of 2 wt.% and 5 wt.% of micro-TiO2 recorded the highest ultimate tensile strength and hardness, respectively. [ABSTRACT FROM AUTHOR]

This article proposes a new approach called revolutionary superposition layout (RSL) for obtaining optimum designs of nonconcurrent multiloads structures in general, and for connecting rod (CR) in particular. Since the compression and tension resulted from the combustion and exhaust strokes are nonconcurrent loads, the importance of this approach arises up. RSL depends on combining the optimum‐design layouts obtained from different individual nonconcurrent load cases into one resultant design. This final design efficiently sustains all different loads applied to it. RSL presents a simple, less computational effort in the dynamic environment, and less time‐consuming method. RSL has been compared with a multiload optimization method called bound formulation (BF) for obtaining the optimum design of some simple models before dealing with the CR model afterward. Two distinctive optimum topological designs of CR produced by RSL have proved their feasibility and achieved considerable improvements against both the conventional CR design being used nowadays in the automotive industry and the BF method designs, as well. A comparative study between them was accomplished based on both structural and modal analyses in ANSYS. As a result, the proposed RSL design shows a significant reduction of compliance, displacement/deflection and mass moment of inertia by 57.2%, 68.7%, and 5.9%, respectively, compared with conventional one. [ABSTRACT FROM AUTHOR]

Background: Primary gastric lymphoma (PGL) is the commonest form of extranodal lymphomas of the gastrointestinal tract. The majority are B-cell non-Hodgkin lymphomas. The most common type is diffuse large B-cell lymphoma (DLBCL) followed by marginal zone lymphoma of mucosa-associated lymphoid tissue (MALT). The aim of this study is to determine the prevalence, classification and pathological pattern of primary gastric lymphoma in comparison with other gastric malignancies and to compare the results with that observed worldwide. Methods: A retrospective cohort study of PGL diagnosed at King Abdulaziz Medical City, National Guard Health Affairs, Riyadh, Saudi Arabia between the years 2013 and 2018. Data will be presented as mean + standard deviation for continuous variables, and frequencies (percentages) for categorical variables. Results: PGL represents 30% of all gastric malignancies with mean age of 64.2 years and slight male predominance. DLBCL is the commonest type (72.2%) followed by MALT lymphoma (14%), anaplastic large cell lymphoma (5%), peripheral T-cell lymphoma, NOS (3%), mantle cell lymphoma (3%) and plasmacytoma/myeloma (3%). 86.7% show association with gastritis, however, H. pylori is observed in 23.5% of PGL with majority being with DLBCL and only 1 case of MALT lymphoma. Conclusion: PGL is the second commonest malignancy of the stomach where most of the cases are DLBCL followed by MALT lymphoma. There is no difference observed in relation to age and sex compared with those observed in the literature. Further analysis is recommended to evaluate the association with H. pylori in our population. [ABSTRACT FROM AUTHOR]

Carbon-based perovskite solar cells (PSCs) have emerged as a hopeful alternative in the realm of photovoltaics. They are considered promising due to their affordability, remarkable durability in humid environments, and impressive electrical conductivity. One approach to address the cost issue is to use affordable counter electrodes in PSCs that do not require organic hole transport materials (HTMs). This study utilized an innovative and economical method to create NiO x /PANI nanocomposites. Later, these nanoparticles were integrated into a carbon paste to act as an HTM. This incorporation is intended to optimize charge extraction, improve interfacial contact, align energy levels, reduce energy loss, minimize charge recombination, and protect the perovskite (FAPbI 3 ) surface from degradation. The optoelectronic properties of these devices were investigated, and all cells showed improved efficiency compared to control cells. The NiO x /PANI doped carbon (NiO x /PANI+CE) exhibited excellent performance due to strong hole conductivity, well-aligned energy levels, and the formation of stepwise band alignment at the perovskite interface., Competing Interests: The authors declare no conflict of interest., (This journal is © The Royal Society of Chemistry.)