223 research outputs found
Methods for exomoon characterisation: combining transit photometry and the Rossiter-McLaughlin effect
It has been suggested that moons around transiting exoplanets may cause
observable signal in transit photometry or in the Rossiter-McLaughlin (RM)
effect. In this paper a detailed analysis of parameter reconstruction from the
RM effect is presented for various planet-moon configurations, described with
20 parameters. We also demonstrate the benefits of combining photometry with
the RM effect. We simulated 2.7x10^9 configurations of a generic transiting
system to map the confidence region of the parameters of the moon, find the
correlated parameters and determine the validity of reconstructions. The main
conclusion is that the strictest constraints from the RM effect are expected
for the radius of the moon. In some cases there is also meaningful information
on its orbital period. When the transit time of the moon is exactly known, for
example, from transit photometry, the angle parameters of the moon's orbit will
also be constrained from the RM effect. From transit light curves the mass can
be determined, and combining this result with the radius from the RM effect,
the experimental determination of the density of the moon is also possible.Comment: 10 pages, 7 figures, accepted for publication in MNRA
Multidimensional Data Visual Exploration by Interactive Information Segments
Visualization techniques provide an outstanding role in KDD process for data analysis and mining. However, one image does not always convey successfully the inherent information from high dimensionality, very large databases. In this paper we introduce VSIS (Visual Set of Information Segments), an interactive tool to visually explore multidimensional, very large, numerical data. Within the supervised learning, our proposal approaches the problem of classification by searching of meaningful intervals belonging to the most relevant attributes. These intervals are displayed as multi–colored bars in which the degree of impurity with respect to the class membership can be easily perceived. Such bars can be re–explored interactively with new values of user–defined parameters. A case study of applying VSIS to some UCI repository data sets shows the usefulness of our tool in supporting the exploration of multidimensional and very large data
The orbit rigidity matrix of a symmetric framework
A number of recent papers have studied when symmetry causes frameworks on a
graph to become infinitesimally flexible, or stressed, and when it has no
impact. A number of other recent papers have studied special classes of
frameworks on generically rigid graphs which are finite mechanisms. Here we
introduce a new tool, the orbit matrix, which connects these two areas and
provides a matrix representation for fully symmetric infinitesimal flexes, and
fully symmetric stresses of symmetric frameworks. The orbit matrix is a true
analog of the standard rigidity matrix for general frameworks, and its analysis
gives important insights into questions about the flexibility and rigidity of
classes of symmetric frameworks, in all dimensions.
With this narrower focus on fully symmetric infinitesimal motions, comes the
power to predict symmetry-preserving finite mechanisms - giving a simplified
analysis which covers a wide range of the known mechanisms, and generalizes the
classes of known mechanisms. This initial exploration of the properties of the
orbit matrix also opens up a number of new questions and possible extensions of
the previous results, including transfer of symmetry based results from
Euclidean space to spherical, hyperbolic, and some other metrics with shared
symmetry groups and underlying projective geometry.Comment: 41 pages, 12 figure
СРЕДСТВА ДИАГНОСТИКИ И УПРАВЛЕНИЯ КИНЕМАТИКОЙ, ИНТЕГРИРОВАННЫЕ В ПОДШИПНИК КАЧЕНИЯ
The concept and possible variants of mechatronic bearings designs of the fourth generation with sensors of angular position and tiny vibroresonance drives for kinematics management during the working process, with built-in diagnostics aid functioning on the basis of the analysis of separator rotation speed fluctuations have been offered.Предложены концепция и возможные варианты конструкций мехатронных подшипников 4-го поколения, имеющих встроенные средства диагностики на основе анализа колебаний скорости вращения сепаратора, датчики углового положения и миниатюрные виброрезонансные приводы для управления кинематикой в процессе работы
Exchange Interaction and in Alkaline-earth-metal-oxide-based DMS without Magnetic Impurities: First Principle Pseudo-SIC and Monte Carlo Calculation
The prospects of half-metallic ferromagnetism being induced by the
incorporation of C atoms into alkaline-earth-metal-oxides are investigated by
the first principle calculation. The origin of the ferromagnetism is discussed
through the calculation of the electronic structure and exchange coupling
constant by using the pseudo-potential-like self-interaction-corrected local
spin density method. The Curie temperature () is also predicted by
employing the Monte Carlo simulation. It is shown that by taking the electron
self-interaction into account, the half-metallic ferromagnetism induced by C in
the host materials is more stabilized in comparison with the standard LDA case,
and the C's electron states in the bandgap become more localized resulting
in the predominance of the short-ranged exchange interaction. While the
ferromagnetism in MgOC is stabilized due to the exchange
interaction of the -nearest neighbor pairs and might be suppressed by the
anti-ferromagnetic super-exchange interaction at higher , the ferromagnetism
in CaOC, SrOC, and BaOC is stabilized by
both the - and -nearest neighbor pairs, and monotonously
increases with the C concentration.Comment: 5 pages, 5 figure
A better life through information technology? The techno-theological eschatology of posthuman speculative science
This is the pre-peer reviewed version of the article, published in Zygon 41(2) pp.267-288, which has been published in final form at http://www3.interscience.wiley.com/journal/118588124/issueThe depiction of human identity in the pop-science futurology of engineer/inventor Ray Kurzweil, the speculative-robotics of Carnegie Mellon roboticist Hans Moravec and the physics of Tulane University mathematics professor Frank Tipler elevate technology, especially information technology, to a point of ultimate significance. For these three figures, information technology offers the potential means by which the problem of human and cosmic finitude can be rectified. Although Moravec’s vision of intelligent robots, Kurzweil’s hope for immanent human immorality, and Tipler’s description of human-like von Neumann probe colonising the very material fabric of the universe, may all appear to be nothing more than science fictional musings, they raise genuine questions as to the relationship between science, technology, and religion as regards issues of personal and cosmic eschatology. In an attempt to correct what I see as the ‘cybernetic-totalism’ inherent in these ‘techno-theologies’, I will argue for a theology of technology, which seeks to interpret technology hermeneutically and grounds human creativity in the broader context of divine creative activity
Seven HCI Grand Challenges
This article aims to investigate the Grand Challenges which arise in the current and emerging landscape of rapid technological evolution towards more intelligent interactive technologies, coupled with increased and widened societal needs, as well as individual and collective expectations that HCI, as a discipline, is called upon to address. A perspective oriented to humane and social values is adopted, formulating the challenges in terms of the impact of emerging intelligent interactive technologies on human life both at the individual and societal levels. Seven Grand Challenges are identified and presented in this article: Human-Technology Symbiosis; Human-Environment Interactions; Ethics, Privacy and Security; Well-being, Health and Eudaimonia; Accessibility and Universal Access; Learning and Creativity; and Social Organization and Democracy. Although not exhaustive, they summarize the views and research priorities of an international interdisciplinary group of experts, reflecting different scientific perspectives, methodological approaches and application domains. Each identified Grand Challenge is analyzed in terms of: concept and problem definition; main research issues involved and state of the art; and associated emerging requirements
Scope
Scope, later retitled Centerscope, was published by the Boston University Medical Center to report on events at and around the Center
Anthropology as Science Fiction, or How Print Capitalism Enchanted Victorian Science
Global Challenges (FSW
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