881 research outputs found
Exploratory study of elevated-temperature tensile properties of alloys based on the intermetallic compound TiNi
The tensile properties and oxygen contamination behavior of TiNi alloyed with aluminum, chromium, and silicon were investigated in the temperature range between 800 and 1000 K (980 and 1340 F). The alloys were significantly stronger than unalloyed TiNi and less susceptible to embrittlement than the Ti-6242 alloy
Room-temperature tensile behavior of /100/ oriented tungsten single crystals with rhenium in dilute solid solution
Tensile deformation behavior of tungsten single crystals with rhenium addition
Gravitational collapse in anti de Sitter space
A numerical and analytic treatment is presented here of the evolution of
initial data of the kind that was conjectured by Hertog, Horowitz and Maeda to
lead to a violation of cosmic censorship. That initial data is essentially a
thick domain wall connecting two regions of anti de Sitter space. The evolution
results in no violation of cosmic censorship, but rather the formation of a
small black hole.Comment: 9 pages, 13 figure
Critical collapse of a massive vector field
We perform numerical simulations of the critical gravitational collapse of a
massive vector field. The result is that there are two critical solutions. One
is equivalent to the Choptuik critical solution for a massless scalar field.
The other is periodic.Comment: 7 pages, 4 figure
Numerical simulation of a possible counterexample to cosmic censorship
A numerical simulation is presented here of the evolution of initial data of
the kind that was conjectured by Hertog, Horowitz and Maeda to be a violation
of cosmic censorship. That initial data is essentially a thick domain wall
connecting two regions of anti-deSitter space. The initial data has a free
parameter that is the initial size of the wall. The simulation shows no
violation of cosmic censorship, but rather the formation of a small black hole.
The simulation described here is for a moderate wall size and leaves open the
possibility that cosmic censorship might be violated for larger walls.Comment: discussion clarifie
A stereographic representation of Knoop hardness anisotropy
Indentation direction parameter for hardness anisotropy representation of single crystal on stereographic triangl
Choptuik scaling in six dimensions
We perform numerical simulations of the critical gravitational collapse of a
spherically symmetric scalar field in 6 dimensions. The critical solution has
discrete self-similarity. We find the critical exponent \gamma and the
self-similarity period \Delta.Comment: 8 pages, 3 figures RevTe
Scale invariance and critical gravitational collapse
We examine ways to write the Choptuik critical solution as the evolution of
scale invariant variables. It is shown that a system of scale invariant
variables proposed by one of the authors does not evolve periodically in the
Choptuik critical solution. We find a different system, based on maximal
slicing. This system does evolve periodically, and may generalize to the case
of axisymmetry or of no symmetry at all.Comment: 7 pages, 3 figures, Revtex, discussion modified to clarify
presentatio
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