Researchers have calculated the threshold size for a comet or asteroid impact that would ignite wildfires worldwide.
The slow, percolating flow of water is accelerated as the conduit becomes larger, and at the threshold size turbulence appears in the flowing water.
At the threshold size the opening is large enough and the flow velocities high enough that insoluble sediments can be transported.
Once a complete pathway has been opened to threshold size, enlargement takes place rapidly as the conduit provides an efficient route for groundwater flow.
Enlargement from threshold size to a full-scale cave passage of one to three metres in diameter can be accomplished in 10,000 to 100,000 years, depending on local geology.
We further propose a threshold size of GNPs for use as an effective vaccine.
The threshold size for size filtering we used is 500 pixels.
There is a threshold size of the initial spatial domain for a successful invasion below which invasion can fail.
Alumina sols below this threshold size lead to polymerization within the gel and formation of much more dense alumina structures.
Strong peaks centered around the origin suggest the presence of particles near the SP to stable SD threshold size.
The criteria used in compiling the inventories are discussed, including the inception dates and the threshold size, and the difference between ancient woodland and parkland.
