22 research outputs found
Initiation of Cracks in Dental Amalgam
The force required to initiate cracks in dental amalgam beams was measured and related to the microstructure. The force measured was dependent on age and on the distribution of phases on the tension side of the beam. The Ag-Cu phase is most resistant to failure in Dispersalloy and an experimental alloy.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/67365/2/10.1177_00220345750540060601.pd
How to Stop (Worrying and Love) the Bubble: Boundary Changing Solutions
We discover that a class of bubbles of nothing are embedded as time dependent
scaling limits of previous spacelike-brane solutions. With the right initial
conditions, a near-bubble solution can relax its expansion and open the compact
circle. Thermodynamics of the new class of solutions is discussed and the
relationships between brane/flux transitions, tachyon condensation and
imaginary D-branes are outlined. Finally, a related class of simultaneous
connected S-branes are also examined.Comment: 47 pages; v2 introduction to Weyl cards added, comments added,
references added, typos corrected, matches JHEP versio