35,242 research outputs found
Loss of Larval Fish by Epilimnial Discharge From DeGray Lake, Arkansas
Weekly samples of larval fish were collected from water discharged from the epilimnion of DeGray Lake into the tailwaters, for power generation, from April through August, 1976 and 1977. Peak rates of loss measured were 1.4 larvae/m³ in May, 1976 and 2.7/m³ in April, 1977. Sunfish, shad and crappie made up 97% of an estimated 83.3 million fish lost in 1976, and 98% of 122.4 million lost in 1977. The most critical period for larval fish loss extended from the last week of April to the first week of June. No definite relationships were noted between length of the power generation period or power generation rate, and rate of larval fish discharge. Diel collections showed the rate of larval fish discharge to be lower and more uniform during darkness than during daylight
Fishes of the Caddo River, Arkansas, After Impoundment of DeGray Lake
Fifty-five collections of fishes were made with small-mesh seines and electrofishing gear in the Caddo River and four of its tributaries during 1974-75. Eighty-two species representing 17 families were collected; 14 of the species had not previously been reported from the Caddo River
On a Uniformly Accelerated Point Charge moving along a Cusp
A uniformly accelerated point charge which moves neither in a straight line
nor in a circle, but in a cusp, is investigated. We find the angular
distribution of the Larmor radiation, the constant power, and the intensity in
the maximal direction. It is found that the intensity of uniformly accelerated
cusp motion scales like non-uniformly accelerated synchrotron radiation. We
confirm the exact vacuum excitation spectra of quantized field detectors on the
world line.Comment: 13 pages, 6 figure
Physical Representation-based Predicate Optimization for a Visual Analytics Database
Querying the content of images, video, and other non-textual data sources
requires expensive content extraction methods. Modern extraction techniques are
based on deep convolutional neural networks (CNNs) and can classify objects
within images with astounding accuracy. Unfortunately, these methods are slow:
processing a single image can take about 10 milliseconds on modern GPU-based
hardware. As massive video libraries become ubiquitous, running a content-based
query over millions of video frames is prohibitive.
One promising approach to reduce the runtime cost of queries of visual
content is to use a hierarchical model, such as a cascade, where simple cases
are handled by an inexpensive classifier. Prior work has sought to design
cascades that optimize the computational cost of inference by, for example,
using smaller CNNs. However, we observe that there are critical factors besides
the inference time that dramatically impact the overall query time. Notably, by
treating the physical representation of the input image as part of our query
optimization---that is, by including image transforms, such as resolution
scaling or color-depth reduction, within the cascade---we can optimize data
handling costs and enable drastically more efficient classifier cascades.
In this paper, we propose Tahoma, which generates and evaluates many
potential classifier cascades that jointly optimize the CNN architecture and
input data representation. Our experiments on a subset of ImageNet show that
Tahoma's input transformations speed up cascades by up to 35 times. We also
find up to a 98x speedup over the ResNet50 classifier with no loss in accuracy,
and a 280x speedup if some accuracy is sacrificed.Comment: Camera-ready version of the paper submitted to ICDE 2019, In
Proceedings of the 35th IEEE International Conference on Data Engineering
(ICDE 2019
Cooperative wrapping of nanoparticles by membrane tubes
The bioactivity of nanoparticles crucially depends on their ability to cross
biomembranes. Recent simulations indicate the cooperative wrapping and
internalization of spherical nanoparticles in tubular membrane structures. In
this article, we systematically investigate the energy gain of this cooperative
wrapping by minimizing the energies of the rotationally symmetric shapes of the
membrane tubes and of membrane segments wrapping single particles. We find that
the energy gain for the cooperative wrapping of nanoparticles in membrane tubes
relative to their individual wrapping as single particles strongly depends on
the ratio of the particle radius and the range of the particle-membrane
adhesion potential. For a potential range of the order of one nanometer, the
cooperative wrapping in tubes is highly favorable for particles with a radius
of tens of nanometers and intermediate adhesion energies, but not for particles
that are significantly larger.Comment: 9 pages, 7 figures; to appear in Soft Matte
No ifs, ands or butts: Illinois casinos lost revenue after smoking banned
Gambling industry ; Tobacco industry ; Illinois
Casino revenue and the Illinois smoking ban
Smoking was banned in all Illinois casinos in January 2008. We explore the effects that the smoking ban has had on Illinois casino revenue and attendance. Our empirical methodology extends and enhances that of previous literature in that we observe a natural experiment in comparing the performance of Illinois casinos with out-of-state casinos (no smoking ban) that share a market with Illinois casinos. Estimates suggest that revenue and admissions at Illinois casinos declined by more than 20 percent (200 million.Gambling industry ; Tobacco industry ; Illinois
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