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For example, when Fe-based material is ball-milled for long periods of time (e.g. 100+ hours), subgrains of 60–90 nm are formed. It has been shown that the higher the density of the subgrains, the higher the yield stress of the material due to the increased subgrain boundary.
Engulfment has a very high fatality rate. [2] While the death rate from workplace accidents on American farms has declined in the first decades of the 21st century, grain-entrapment deaths have not, reaching an all-time annual high of 31 deaths in 2010. [3] Many of those victims have been minors. [4]
Density is an intensive property in that increasing the amount of a substance does not increase its density; rather it increases its mass. Other conceptually comparable quantities or ratios include specific density, relative density (specific gravity), and specific weight.
Behavioral sink" is a term invented by ethologist John B. Calhoun to describe a collapse in behavior that can result from overpopulation. The term and concept derive from a series of over-population experiments Calhoun conducted on Norway rats between 1958 and 1962. [ 1 ]
The linear increase assumes that the time needed by the consumer to process a food item is negligible, or that consuming food does not interfere with searching for food. A functional response of type I is used in the Lotka–Volterra predator–prey model. It was the first kind of functional response described and is also the simplest of the ...
For example, regions of warmer low-density air rise, while those of colder high-density air sink. This creates a circulating flow: convection. Gravity drives natural convection. Without gravity, convection does not occur, so there is no convection in free-fall environments, such as that of the orbiting International Space Station. Natural ...
A food truck is a large motorized vehicle (such as a van or multi-stop truck) or trailer equipped to store, transport, cook, prepare, serve and/or sell food. [1] [2]Some food trucks, such as ice cream trucks, sell frozen or prepackaged food, but many have on-board kitchens and prepare food from scratch, or they reheat food that was previously prepared in a brick and mortar commercial kitchen.
Furthermore, an object with a higher density than the bed will sink, whereas an object with a lower density than the bed will float, thus the bed can be considered to exhibit the fluid behavior expected of Archimedes' principle. As the "density", (actually the solid volume fraction of the suspension), of the bed can be altered by changing the ...