55,589 research outputs found
Seismic effects on the rotational dynamics of the earth and its gravitational field
The effects of earthquakes on the rotational motion of the earth were studied. The connection between the fault parameters and the corresponding changes in the moments and products of inertia were analytically developed. The reciprocal theorem of elasticity and Volterra's formula were applied as well as the displacement and stress fields for the second degree static response of the earth model being used. The numerical results of the investigation yield the magnitude and direction of the pole shift as well as the change in the length of the day. The changes in the second degree coefficients of the geopotential were computed. Source parameters corresponding to the Alaskan earthquake on March 28, 1964 were used to generate numerical results
Skywalking GEMS and UDF
The two large colour mosaics of the GEMS and UDF projects, both obtained with
the Hubble Space Telescope and ACS, consist of large amounts of data. We
present two web application pages (the GEMS and UDF "Skywalker") that allow to
pan around in these mosaics with downloading only small parts at a time.Comment: 1 pag
Radial deformation of the earth by oceanic tidal loading
A high-degree spherical harmonic series is used to compute the radial deformation of the Earth by oceanic tidal loading. By exploiting fast numerical transforms, this approach is found to be much more efficient, but no less accurate, than the traditional Green's function approach. The method is used to derive an atlas of load tide maps for 10 constitutents of the NSWC ocean tide model
Comparison of Gaussian process modeling software
Gaussian process fitting, or kriging, is often used to create a model from a
set of data. Many available software packages do this, but we show that very
different results can be obtained from different packages even when using the
same data and model. We describe the parameterization, features, and
optimization used by eight different fitting packages that run on four
different platforms. We then compare these eight packages using various data
functions and data sets, revealing that there are stark differences between the
packages. In addition to comparing the prediction accuracy, the predictive
variance--which is important for evaluating precision of predictions and is
often used in stopping criteria--is also evaluated
Automated DNA Motif Discovery
Ensembl's human non-coding and protein coding genes are used to automatically
find DNA pattern motifs. The Backus-Naur form (BNF) grammar for regular
expressions (RE) is used by genetic programming to ensure the generated strings
are legal. The evolved motif suggests the presence of Thymine followed by one
or more Adenines etc. early in transcripts indicate a non-protein coding gene.
Keywords: pseudogene, short and microRNAs, non-coding transcripts, systems
biology, machine learning, Bioinformatics, motif, regular expression, strongly
typed genetic programming, context-free grammar.Comment: 12 pages, 2 figure
Complexity in forecasting and predictive models
Te challenge of this special issue has been to know the
state of the problem related to forecasting modeling and
the creation of a model to forecast the future behavior
that supports decision making by supporting real-world applications.
Tis issue has been highlighted by the quality of its
research work on the critical importance of advanced analytical methods, such as neural networks, sof computing,
evolutionary algorithms, chaotic models, cellular automata,
agent-based models, and fnite mixture minimum squares
(FIMIX-PLS).info:eu-repo/semantics/publishedVersio
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