9,961 research outputs found
Controlling the Size of Popcorn
We present a thermo-statistical model of popcorn production and propose a way
to control the final size of the popcorn by monitoring only the chamber
pressure.Comment: 6 pages; revision (typo and minor content corrections
Density Functional Theory of Hard Sphere Condensation Under Gravity
The onset of condensation of hard spheres in a gravitational field is studied
using density functional theory. In particular, we find that the local density
approximation yields results identical to those obtained previously using the
kinetic theory [Physica A 271, 192, (1999)], and a weighted density functional
theory gives qualitatively similar results, namely, that the temperature at
which condensation begins at the bottom scales linearly with weight, diameter,
and number of layers of particles.Comment: 17 pages, 4 figure
The decline in teen labor force participation
The authors examine the recent decline in teen work activity, offering explanations for both the long secular decline since the late 1970s and the recent acceleration in this decline since 2000. They argue that much of this pattern is due to a significant increase in the rewards to formal education. They also explore the importance of changes to labor demand, crowding out by substitutable workers, the increased work activity of mothers, and increases in wealth.Labor mobility
Explaining the decline in teen labor force participation
Fewer teenagers are participating in the labor force today than at any point since WWII. At just under 44%, teen labor force participation is 15 percentage points below its peak in the late 1970s. Why has there been a long-run secular decline in the work activity of young adults, and why has it sharply accelerated in the last five years?Labor market ; Employees, Training of
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