American Journal of Applied Science and Technology

Enhanced Control of Suspended Cable Robots Using an Optimized Fuzzy Synergetic Method

2025-07-01T00:50:41+00:00

Suspended Cable-Driven Parallel Robots (CDPRs) are increasingly utilized in various applications due to their large workspace and high payload capacity. However, their control presents significant challenges, including highly nonlinear dynamics, the requirement for positive cable tension, and susceptibility to uncertainties and external disturbances. Traditional control methods often struggle to achieve precise trajectory tracking while ensuring positive cable tension and robustness. This article proposes and analyzes a hypothetical Optimized Adaptive Fuzzy Synergetic Controller (OAFSC) for suspended CDPRs. The controller combines the strengths of synergetic control for robust tracking and dimension reduction, adaptive control for handling uncertainties, and fuzzy logic for approximating complex nonlinearities. Furthermore, the controller parameters are optimized using a meta-heuristic algorithm, specifically the Dragonfly Algorithm (DA), to enhance performance. The Introduction provides background on CDPRs and the motivation for advanced control strategies. The Methods section details the hypothetical design of the OAFSC, the integration of fuzzy logic and adaptive laws, the formulation of the optimization problem, and the application of the DA. Hypothetical Results demonstrate improved trajectory tracking accuracy, enhanced robustness to disturbances and model uncertainties, and effective management of cable tensions compared to conventional control approaches. The Discussion interprets these potential findings, highlights the advantages of the OAFSC, acknowledges limitations of the hypothetical study, and suggests future research directions, including experimental validation and exploration of other optimization techniques.

Study of Modifier Influence on The Catalytic Conversion of Syngas into High-Molecular-Weight Hydrocarbons

2025-07-15T04:56:11+00:00

This study investigates the effect of sodium-based modifiers on the catalytic synthesis of high-molecular-weight liquid hydrocarbons from syngas (CO + H₂). Catalysts with the composition 20%Co–20%Fe–5%B–1.5%Zr–(0–2)%Na supported on Al₂O₃ and SiO₂ were synthesised using the incipient wetness impregnation method. Various sodium compounds (NaNO₃, NaCl, Na₂CO₃, and NaOH) were applied as modifiers. The catalysts were characterised using chromatographic, X-ray diffraction, and technological analysis methods to determine their phase composition, distribution of active sites, and reaction efficiency.

The study highlights the influence of support material nature and sodium loading on CO conversion, hydrocarbon productivity, and product selectivity. According to the analysis, Na modification significantly enhanced the activation of active centres and chain growth probability in Al₂O₃-based catalysts, while this effect was less pronounced for catalysts supported on SiO₂. Additionally, both the sodium source and the sequence of metal deposition on the carrier surface were found to play a critical role in determining overall catalyst performance and product distribution.

These findings confirm the potential of sodium-modified cobalt–iron–boron–zirconium catalysts in achieving high productivity and selectivity in Fischer–Tropsch-type hydrocarbon synthesis. The results provide practical insights for the design of advanced catalytic systems for efficient syngas conversion.

Low-Temperature Treatment of Malleable Cast Iron

2025-07-09T13:05:45+00:00

This study explores the effect of low-temperature treatment (LTT) on the graphitization behavior of malleable cast iron during annealing. The results show that a properly selected LTT regime significantly promotes the formation of graphite inclusions, thereby accelerating cementite decomposition. The efficiency of LTT is determined by several key factors, including treatment temperature, duration, number of cycles, and the pre-treatment cooling conditions. Single-stage LTT is most effective at 300–400°C, while double and multi-stage treatments demonstrate enhanced performance, especially when the first cycle is conducted within 100–400°C. Longer exposure times further improve graphite inclusion formation, and the resulting structural changes remain stable even after prolonged storage at room temperature. Additionally, slow heating from 20°C to 700°C is identified as a viable alternative to traditional LTT, offering similar structural benefits. The most effective annealing approach involves holding the material at 300–400°C followed by a gradual rise to the pearlite transformation range, a method well-suited to the capabilities of standard industrial equipment. These findings provide valuable guidance for optimizing heat treatment practices in malleable cast iron manufacturing.

The Level of Glycated Albumin Is Closely Correlated with The Level of Glycated Hemoglobin in Patients with Type 2 Diabetes Mellitus

2025-07-15T05:02:04+00:00

Glycated albumin demonstrates a convincing correlation with glycated hemoglobin levels in patients with type 2 diabetes mellitus. This indicator allows one to evaluate the state of carbohydrate metabolism, reflecting the average glucose level over a shorter period of time compared to glycated hemoglobin. Such ratio makes glycated albumin an important marker for monitoring the course of the disease, especially in cases where it is necessary to quickly respond to changes in blood glucose levels.

The Comparative Analysis of Indigenous Soil Bacteria and Their Oil-Degrading Potential in Certain Areas of the “Jarkurgan-Neft” Oil Fields

2025-07-14T13:32:43+00:00

This article investigates the oil-degrading potential of indigenous bacterial strains isolated from various oil-contaminated soils and products in the Jarkurgan and Kumkurgan districts of Surkhandarya region. Based on the analysis of the quantity and quality of microorganisms present in collected samples of soil, oil sludge, crude oil, and water, 24 pure bacterial isolates—predominantly occurring species—were isolated. These strains were comparatively characterized in terms of their growth and oil-degrading activity in a minimal medium supplemented with crude oil as the sole carbon source. Additionally, nine bacterial isolates exhibiting high oil-degrading potential were studied under conditions of Raimondo synthetic medium containing 1.0–2.0% crude oil, focusing on their morphological characteristics and hydrocarbon utilization efficiency.