41,696 research outputs found
Predicting and Understanding Order of Heteroepitaxial Quantum Dots
Heteroepitaxial self-assembled quantum dots (SAQDs) will allow breakthroughs
in electronics and optoelectronics. SAQDs are a result of Stranski-Krastanow
growth whereby a growing planar film becomes unstable after an initial wetting
layer is formed. Common systems are GeSi/Si and
InGaAs/GaAs. For applications, SAQD arrays need to be ordered.
The role of crystal anisotropy, random initial conditions and thermal
fluctuations in influencing SAQD order during early stages of SAQD formation is
studied through a simple stochastic model of surface diffusion. Surface
diffusion is analyzed through a linear and perturbatively nonlinear analysis.
The role of crystal anisotropy in enhancing SAQD order is elucidated. It is
also found that SAQD order is enhanced when the deposited film is allowed to
evolve at heights near the critical wetting surface height that marks the onset
of non-planar film growth.Comment: under revie
What Went Wrong? Lessons in Leadership from Solomon, the Bible’s Wisest and Worst Ruler
This paper attempts to demonstrate the many insights about successful and unsuccessful leadership that may be derived from the life of King Solomon, who, according to Scripture, was the wisest man who ever lived. Solomon may have been very wise but made some very serious blunders as a leader that led to the breakup of his empire after his son took over. This paper answers the obvious question as to which mistake/character flaw transformed Solomon from a great leader to an unsuccessful leader. This paper will also examine the Book of Proverbs attributed to Solomon and see what leadership lessons can be gleaned from it. One question that the paper will attempt to answer is whether or not Solomon followed the path of wisdom discussed in Proverbs
Comment: Classifier Technology and the Illusion of Progress
Comment on Classifier Technology and the Illusion of Progress
[math.ST/0606441]Comment: Published at http://dx.doi.org/10.1214/088342306000000024 in the
Statistical Science (http://www.imstat.org/sts/) by the Institute of
Mathematical Statistics (http://www.imstat.org
X-ray variability observed with HEAO A-1
Results from the HEAO A-1 instrument which observed X-ray source variability over a wide range of accessible timescales are surveyed. The objects observed include quasars, BL Lacertae, and active galactic nuclei. A high sensitivity search for X-ray pulsars, known black hole candidates, period fluctuation in binary pulsars, and X-ray and gamma ray bursts are among the topics covered
Upper air physics, radio astronomy, and rocket spectroscopy Annual report
Research in upper air physics, radio astronomy, and rocket spectroscop
Anisotropy and Order of Epitaxial Self-Assembled Quantum Dots
Epitaxial self-assembled quantum dots (SAQDs) represent an important step in
the advancement of semiconductor fabrication at the nanoscale that will allow
breakthroughs in electronics and optoelectronics. In these applications, order
is a key factor. Here, the role of crystal anisotropy in promoting order during
early stages of SAQD formation is studied through a linear analysis of a
commonly used surface evolution model. Elastic anisotropy is used a specific
example. It is found that there are two relevant and predictable correlation
lengths. One of them is related to crystal anisotropy and is crucial for
determining SAQD order. Furthermore, if a wetting potential is included in the
model, it is found that SAQD order is enhanced when the deposited film is
allowed to evolve at heights near the critical surface height for
three-dimensional film growth.Comment: 11 pages, 1 figur
Comment: Classifier Technology and the Illusion of Progress
Comment on Classifier Technology and the Illusion of Progress
[math.ST/0606441]Comment: Published at http://dx.doi.org/10.1214/088342306000000042 in the
Statistical Science (http://www.imstat.org/sts/) by the Institute of
Mathematical Statistics (http://www.imstat.org
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