Eurasian Journal of Engineering and Technology

Oriented Fiberboard (OSB)

Abdullayev Ikrom Aminjanovich — 2024-10-04

Oriented fiber covering materials are panels made of wood chips. Its abbreviation is derived from the initials of the English phrase "Oriented Strand Board", which means "oriented particle board" when translated. means bread.

The Use Of Environmentally Acceptable Energies

Bafoyev Olimjon Hoshim o’g’li — 2024-10-04

This article examines the technologies for the use of solar energy, in particular, on the example of Israel. Methods for improving energy efficiency are analyzed through solar water heaters and passive heating systems. Examples of how to obtain hot water year-round through water heaters and increase the efficiency of devices are given. The importance of building structure and efficient heat saving methods are also discussed in the use of solar energy. The article reveals the importance of innovative technologies in the field of solar energy.

Review On Calendar Aging Mechanisms And Estimations Of Lithium-Ion Batteries In Electric Vehicles

Ismatov Biloldin — 2024-10-26

Lithium-ion batteries (LIBs) have changed the storage of energy in a major way, and so they are now considered an extremely important technology in electronic powered devices such as EVs (EVs), consumer electronics, and renewable energy storage systems. They have, though, under different conditions of use, had slower capacity in general due to both the increased and decreased reactions and the mechanical units that were consequently eroded in the course of their use and storage. These are cyclic aging and calendar aging. Cycle aging occurs when batteries are repeatedly charged and discharged. And calendar aging means a gradual loss of performance even when the battery is not actively being used. Both types of aging are affected by several factors such as temperature, charge level, and usage pattern. This article focuses on how these processes affect performance and lifetime by reviewing the main mechanisms that contribute to battery aging. We also explore different models used to estimate the state of health (SOH) of batteries and estimate how long they will last. By examining empirical, semi-empirical and physics-based models, we aim to provide a clear understanding of the factors that lead to lithium-ion battery degradation and the methodologies available to accurately predict battery performance over time.

Solution Properties, Surface Activities And Antimicrobial Effectiveness Of New Biological Surfactants

R. Makhkamov — 2024-10-23

The solution properties, surface activities and antimicrobial effectiveness of new biological surface active-substances obtained from microbial cultural liquids and medical plant cells have been investigated. A very good correlation between the foam forming ability and the surface activity of new biological surfactants has been determined. It has been shown, that the stability of surfactant foams significantly determined by the interaction of surfactant molecules in the monolayer. The contact angles of biosurfactant water solutions on hydrophilic and lipophilic surfaces have been investigated. The obtained results with biosurfactant water solutions on the hydrophilic surfaces showed, that lipophilization of hydrophilic surfaces occurred at low biosurfactant concentrations. At higher biosurfactant concentrations the contact angles decreased due to the orientation of biosurfactant molecules by the polar groups on the surfaces. It has been established, that the increase in the cosine of the contact angles at higher surfactant concentrations was associated with the hydrophilization of the surfaces due to the formation of micelles on the surfaces. It has been established that the effect of the biosurfactant structure on the adsorptive modification of surfaces occurs only at low biosurfactant concentrations. The antimicrobial activityes of new biological surfactants water solutions have been investigated. The obtained results showed, that the new biological surfactants water solutions were effective against studied microorganisms. Field tests of new composite preparations based on antimicrobial biological surfactants for plant seeds growth on saline soils were carried out. For field tests, aqueous solutions of composite preparations with new biological surfactants were used. The obtained results showed, that the use of new composite preparations with biological surfactants ensured a good germination and growth of seeds.