9,971 research outputs found
Southern Chesapeake Bay water color and circulation analysis
There are no author-identified significant results in this report
An Agent-Based Model of Behavior in âBeauty Contestâ Games
Recently, computer simulation, particularly agent-based modeling, has grown in popularity as a method to uncover macro patterns and developments that emerge from simple micro behavior. The present paper combines both techniques by using protocol analysis to uncover player strategies in an experiment and encoding those strategies in an agent-based computer simulation. In particular, Keynesâ (1936) beauty contest analogy is simulated in a number-guessing context. Several researchers have conducted experiments asking subjects to play âp-beauty contest gamesâ in order to compare the experimental results with those predicted by the game-theoretic, deductive reasoning concept of iterated dominance. Our results are compared with those found experimentally in order to demonstrate the usefulness of a combining agent-based modeling with protocol analysis.Agent-Based modeling; Beauty contest games
Torque and temperature dependence of the hysteretic voltage-induced torsional strain in tantalum trisulfide
We have measured the dependence of the hysteretic voltage-induced torsional
strain (VITS) in crystals of orthorhombic tantalum trisulfide on temperature
and applied torque. In particular, applying square-wave voltages above the
charge-density-wave (CDW) threshold voltage, so as to abruptly switch the
strain across its hysteresis loop, we have found that the time constant for the
VITS to switch (at different temperatures and voltages) varied as the CDW
current. Application of torque to the crystal could also change the VITS time
constant, magnitude, and sign, suggesting that the VITS is a consequence of
residual torsional strain in the sample which twist the CDW. Application of
voltage changes the pitch of these CDW twists, which then act back on the
lattice. However, it remains difficult to understand the sluggishness of the
response.Comment: 20 pages, including 7 figures, to be published in PR
Method and apparatus for fabricating improved solar cell modules
A method and apparatus for fabricating an improved solar cell module is described. The apparatus includes a supply drum for feeding a flexible strip having etched electrical circuitry deposited on it a supply drum for feeding into overlying engagement with the flexible strip a flexible tape having a pair of exposed tacky surfaces, and a plurality of rams for receiving and depositing a plurality of solar cells in side-by-side relation on an exposed tacky surface of the tape in electrical contacting engagement with the etched circuitry
Seeding systems for use with a laser velocimeter in large scale wind tunnels
Three seeding systems have been used in the 4- by 7- Meter Tunnel at NASA Langley Research Center: Kerosene smoke, solid particle dry dispersing, and solid particle liquid dispersing. It is anticipated that the liquid dispersing system will be used in all future applications at this facility because: (1) it has a steady output; (2) it is easy to operate and reconfigure; and, (3) it delivers particles of near uniform size
Characterization of the Torsional Piezoelectric-like Response of Tantalum Trisulfide Associated with Charge-Density-Wave Depinning
We have studied the frequency and voltage dependence of voltage-induced
torsional strains in orthorhombic TaS3 [V. Ya. Pokrovskii, et al, Phys. Rev.
Lett. 98, 206404 (2007)] by measuring the modulation of the resonant frequency
of an RF cavity containing the sample. The strain has an onset voltage below
the charge-density-wave (CDW) threshold voltages associated with changes in
shear compliance and resistance, suggesting that the strain is associated with
polarization of the CDW rather than CDW current. Measurements with square-wave
voltages show that the strain is very sluggish, not even reaching its dc value
at a frequency of 0.1 Hz, but the dynamics appear to be very sample dependent.
By applying oscillating torque while biasing the sample with a dc current, we
have also looked for strain induced voltage in the sample; none is observed at
the low biases where the voltage-induced strains first occur, but an induced
voltage is observed at higher biases, probably associated with strain-dependent
CDW conductance.Comment: 11 pages, including 3 figures, to be published in Phys. Rev. B (Rapid
Comm.
An integrated study of earth resources in the State of California based on Skylab and supporting aircraft data
There are no author-identified significant results in this report
Saturn AS-204/LM-1 postflight trajectory, part 4
Saturn AS-204/LM-1 postflight trajectory analysi
Independent particle descriptions of tunneling from a many-body perspective
Currents across thin insulators are commonly taken as single electrons moving
across classically forbidden regions; this independent particle picture is
well-known to describe most tunneling phenomena. Examining quantum transport
from a different perspective, i.e., by explicit treatment of electron-electron
interactions, we evaluate different single particle approximations with
specific application to tunneling in metal-molecule-metal junctions. We find
maximizing the overlap of a Slater determinant composed of single particle
states to the many-body current-carrying state is more important than energy
minimization for defining single particle approximations in a system with open
boundary conditions. Thus the most suitable single particle effective potential
is not one commonly in use by electronic structure methods, such as the
Hartree-Fock or Kohn-Sham approximations.Comment: 4+ pages, 4 figures; accepted to Phys. Rev. B Rapid Communication
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