3,548 research outputs found
Wave by Wave: A Fantasy Author\u27s Guide for Refining a Creative Writing Style
Writing a novel is a great undertaking. Many would-be writers have set out to create a novel and give up halfway through, uncertain where or how they failed. This project aims to help prospective authors get past that barrier. By analyzing one’s own writing style, a writer can ascertain greater insight into the strengths and weaknesses of one’s own work and therefore help rectify mistakes one might make otherwise, or learn to see a chapter from a new angle. The author will demonstrate this method on himself first by way of focused revisions. A sample chapter of a fantasy novel, written by the author, will be provided as a baseline, and then the author will rewrite that chapter four different ways, focusing on a different element of storytelling with each rewrite: plot, character development, dialogue, and theme/tone. Following the baseline chapter, an analysis section will then dissect and analyze the author’s writing style, pulling excerpts from the rewrites, and pointing out their strengths and weaknesses so as to provide a model for other prospective writers
Arrow 227: Air transport system design simulation
The Arrow 227 is a student-designed commercial transport for use in a overnight package delivery network. The major goal of the concept was to provide the delivery service with the greatest potential return on investment. The design objectives of the Arrow 227 were based on three parameters; production cost, payload weight, and aerodynamic efficiency. Low production cost helps to reduce initial investment. Increased payload weight allows for a decrease in flight cycles and, therefore, less fuel consumption than an aircraft carrying less payload weight and requiring more flight cycles. In addition, fewer flight cycles will allow a fleet to last longer. Finally, increased aerodynamic efficiency in the form of high L/D will decrease fuel consumption
The Shadows of a Cycle Cannot All Be Paths
A "shadow" of a subset of Euclidean space is an orthogonal projection of
into one of the coordinate hyperplanes. In this paper we show that it is
not possible for all three shadows of a cycle (i.e., a simple closed curve) in
to be paths (i.e., simple open curves).
We also show two contrasting results: the three shadows of a path in can all be cycles (although not all convex) and, for every ,
there exists a -sphere embedded in whose shadows
have no holes (i.e., they deformation-retract onto a point).Comment: 6 pages, 10 figure
Constraining the neutron-matter equation of state with gravitational waves
We show how observations of gravitational waves from binary neutron star
(BNS) mergers over the next few years can be combined with insights from
nuclear physics to obtain useful constraints on the equation of state (EoS) of
dense matter, in particular, constraining the neutron-matter EoS to within 20%
between one and two times the nuclear saturation density $n_0\approx 0.16\
{\text{fm}^{-3}}$. Using Fisher information methods, we combine observational
constraints from simulated BNS merger events drawn from various population
models with independent measurements of the neutron star radii expected from
x-ray astronomy (the Neutron Star Interior Composition Explorer (NICER)
observations in particular) to directly constrain nuclear physics parameters.
To parameterize the nuclear EoS, we use a different approach, expanding from
pure nuclear matter rather than from symmetric nuclear matter to make use of
recent quantum Monte Carlo (QMC) calculations. This method eschews the need to
invoke the so-called parabolic approximation to extrapolate from symmetric
nuclear matter, allowing us to directly constrain the neutron-matter EoS. Using
a principal component analysis, we identify the combination of parameters most
tightly constrained by observational data. We discuss sensitivity to various
effects such as different component masses through population-model
sensitivity, phase transitions in the core EoS, and large deviations from the
central parameter values.Comment: 13 pages, 9 figures + supplement 11 page
Measured reduction in Alfv\'en wave energy propagating through longitudinal gradients scaled to match solar coronal holes
We have explored the effectiveness of a longitudinal gradient in Alfv\'en
speed in reducing the energy of propagating Alfv\'en waves under conditions
scaled to match solar coronal holes. The experiments were conducted in the
Large Plasma Device at the University of California, Los Angeles. Our results
show that the energy of the transmitted Alfv\'en wave decreases as the
inhomogeneity parameter, , increases. Here, is the
wavelength of the Alfv\'en wave and is the scale length of Alfv\'en
speed gradient. For gradients similar to those in coronal holes, the waves are
observed to lose a factor of more energy than they do when
propagating through a uniform plasma without a gradient. We have carried out
further experiments and analyses to constrain the cause of wave energy
reduction in the gradient. The loss of Alfv\'en wave energy from mode coupling
is unlikely, as we have not detected any other modes. Contrary to theoretical
expectations, the reduction in the energy of the transmitted wave is not
accompanied by a detectable reflected wave. Nonlinear effects are ruled out as
the amplitude of the initial wave is too small and the wave frequency well
below the ion cyclotron frequency. Since the total energy must be conserved, it
is possible that the lost wave energy is being deposited in the plasma. Further
studies are needed to explore where the energy is going
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