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Updated: Jul 2, 2025

Fabrication and Operation of a Nano-Optical Conveyor Belt
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Research on factors affecting the spread of dust pollution in conveyor belt workshop and research on wet dust

Deji Jing1,2,3, Jichuang Ma1,2,3, Zhe Dong1,2,3

  • 1College of Safety Science and Engineering, Liaoning Technical University, Fuxin, China.

Plos One
|February 23, 2024
PubMed

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This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
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Dry friction occurs when two solid surfaces slide against each other without any lubrication or fluid present. It causes resistance when pushing objects along a surface, like a gardener pushing a wheelbarrow. The force applied to move the cart causes dry friction between the wheel and the ground.
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Air-entraining agents improve the durability and workability of concrete in climates with frequent freezing and thawing. These agents prevent cracks by introducing small air bubbles into the mix, creating spaces accommodating water expansion when temperatures drop. The air-entraining agents lower the surface tension of water, forming stable, small air bubbles. This method is more effective than having accidental large voids, as the intentional, smaller, and evenly distributed air voids improve...
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