Liquefaction of quicksand under stress

Article Abstract:

A demonstration that quicksand, which consists of fine sand, clay and salt water acts as a trap because it becomes unstable when it is forced to move, first it liquefies, and then it collapses, is presented. Rheometrical tests reveal its extreme sensitivity to very small variations in stress.

United States, Science & research, Atomic properties, Quicksand

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Controlling droplet deposition with polymer additives

Article Abstract:

The leaves of glossy plants are designed to repel water droplets, making it difficult to treat them with herbicide and pesticide sprays. New research shows that the addition of small amounts of a flexible polymer to the aqueous spray can inhibit droplet rebound.

Polymers

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Smart polymer solutions

Article Abstract:

Spraying glossy-leaved plants with herbicides and pesticides is inefficient because the leaves' waxy layers repel droplets. A new study shows that retraction is slowed by adding long, flexible polymers at low concentrations.

Agricultural chemicals

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