Eurasian Journal of Engineering and Technology

Production of Complex Fertilizer by Activating Low-Grade Phosphorites. A Review

Kholiyorova Oghiloy J, Mirzakulov CH. X, Diyarov Kh.D. — Mon, 06 Mar 2023 00:00:00 +0000

In this scientific work, a studying of conducted on obtaining mineral complex fertilizers using methods of thermal enrichment of low-grade phosphorites. Enrichment of lowgrade phosphates Production from non-enriched phosphate raw materials and thermal concentrate has been launched. Technical conditions have been developed for all types of raw materials in Central Kyzylkum. Despite the similarity of Central Kyzylkum phosphorite with phosphorite deposits in other North Africa and Afghanistan, some parts are different. Therefore, the method of production of products obtained from Central Kyzylkum phosphorite differs from the methods of traditional production. Central Kyzylkum phosphorite has some advantages over previously used Karatau phosphorite. It is a deficiency of four oxides of magnesium, iron, aluminum, and silicon

Characterization the mechanical properties of Sustainable poly(methyl methacrylate) biopolymer

Noor Emad Kareem, Thura Abd Al-Ameer Alrubaie — Mon, 06 Mar 2023 00:00:00 +0000

Denture materials must have robust mechanical properties to withstand high pressures within the mouth. The present study investigates the mechanical properties, including the tensile, hardness, and impact of a new denture composite made of poly(methyl methacrylate) (PMMA) and reinforced with eggshell (ES) powder. The new PMMA (PMMA-EC) was manufactured by mixing different ratios of ES (1 to 7% wt.) with 5% (wt) of Chitosan (CS) (as antibacterial). The new composite was tested for the tensile, hardness, and impact, and the results were compared with those of the traditional PMMA-EC (containing only 5% chitosan). Additionally, a Scanning Electron Microscopy (SEM) was used to examine the dispersion of ES in the material. The results of this study indicated that adding 1% of ES powder did not affect the mechanical properties of the composite. However, increasing the ratio of ES powder to 5% achieved the best improvement in the mechanical properties of the new composite, while increasing the ES ratio by more than 5% caused a considerable decrease in the mechanical strength. Generally, the tensile, hardness, and impact of the new denture composite were examned, respectively

Compensation of Reactive Power in Asynchronous Motors of Agricultural Enterprises

Abdullo Panoev, Makhsum Bozorov — Thu, 09 Mar 2023 00:00:00 +0000

This article provides information about the series and ratings of three-phase asynchronous motors with a squirrel-cage rotor used in agricultural enterprises. The amount of active and reactive power consumed by an agricultural enterprise in 2022- 2023 was also analyzed, and a proposal was made to compensate for reactive power.

Removal of Humic Substances from Drinking Water by Microfiltration, Ultrafiltration, and Nanofiltration membranes

Ali Abdulkhaliq Kamal — Sat, 11 Mar 2023 00:00:00 +0000

In this research, three types of flat sheet membranes were fabricated from polysulfone and N, N diamthelyformamide (DMF) by using wet phase inversion method. Microfiltration (MF), ultrafiltration (UF), and nanofiltration (NF) membranes. The mean pore size diameter of these membranes were calculated which are (0.2 µm, 10 nm and 0.1nm) respectively. The efficiency of membranes was examined to remove humic acid (HA) from synthetic water containing different concentration (3,6,8, and 10 mg/L), and their performances were compared. UV254nm absorbance was used to determine the % of HA compounds eliminated from permeates and retentate samples. To analyze the flux decay and biofouling induced by organic matter, three samples of each membrane were tested using a cross flow filtering system with a single flat sheet membrane. Filtration test of synthetic water containing 8mg/L HA shows removal efficiency 100% for nanofiltration membrane, while ultrafiltration and microfiltration membranes shows removal efficiency 88% and 15% respectively. However, the NF membrane removed 100% of HA and their good efficiency for removing conductivity and turbidity (90, 75%) respectively, but UF membrane is seem to be more convenient from practical point of view, due to their good rejection of HA and turbidity (88% and 70%)) respectively in addition, their good recovery of flux after back washing (88%). The most draw back against NF membrane are their high cost, and high pressure required for operation. Also NF removed the hardness from the water, which are important in proper drinking water quality

" A state of the art review of Static Analysis of Multi Layers RC Deep Beams Under Combined Shear and Torsion "

Siraj Khalid Yahqoop, Saad Khalaf Mohaisen — Mon, 20 Mar 2023 00:00:00 +0000

RC deep beams, which serve as transfer girders in bridges and tall buildings, are crucial structural systems that must be safe since they bear heavy loads across small spans. The shear strength and pure torsion together of deep beams is not reliably and properly predicted by recent design standards in practice codes, and in some situations, they are dangerous. To improve current design methodologies and more precisely anticipate the shear and torsion capacity of such members, it is the goal of this effort to understand the behavior of (hybrid) deep beams and their controlling factors. This study examines the impact of vertical and horizontal reinforcement and shear span ratios on failure modes and strengths. This study summarizes earlier research on strengthening Deep (hybrid) beams by the ratio of vertical and horizontal reinforcement resist both shear and torsion and adding SFRC technology. It also illustrates the impact of several strengthening materials of concrete, fiber reinforced concrete and ultra-high strength concrete (UHSC) and their effect on the flexural strength of RC beams