10,480 research outputs found
Conical: an extended module for computing a numerically satisfactory pair of solutions of the differential equation for conical functions
Conical functions appear in a large number of applications in physics and
engineering. In this paper we describe an extension of our module CONICAL for
the computation of conical functions. Specifically, the module includes now a
routine for computing the function , a
real-valued numerically satisfactory companion of the function for . In this way, a natural basis for solving
Dirichlet problems bounded by conical domains is provided.Comment: To appear in Computer Physics Communication
Determining factors in becoming a sustainable smart city: an empirical study in Europe
This paper aims firstly to identify differences and similarities between cities according to the activities which are necessary to become a smart city and secondly to identify relevant factors that could influence positions in the smart cities ranking. To achieve these goals, this study uses a quantitative analysis applied to 73 European cities to identify the factors that influence differences between smart cities. The results suggest the formation of clusters around European smart cities and also that cities located geographically in the west of Europe and with governance by women present higher levels in the European Smart Cities rankings.info:eu-repo/semantics/publishedVersio
Computation of a numerically satisfactory pair of solutions of the differential equation for conical functions of non-negative integer orders
We consider the problem of computing satisfactory pairs of solutions of the
differential equation for Legendre functions of non-negative integer order
and degree , where is a non-negative real
parameter. Solutions of this equation are the conical functions
and ,
. An algorithm for computing a numerically satisfactory pair of solutions
is already available when (see \cite{gil:2009:con},
\cite{gil:2012:cpc}).In this paper, we present a stable computational scheme
for a real valued numerically satisfactory companion of the function
for , the function
. The
proposed algorithm allows the computation of the function on a large parameter
domain without requiring the use of extended precision arithmetic.Comment: To be published in Numerical Algoritm
Computing Storyline Visualizations with Few Block Crossings
Storyline visualizations show the structure of a story, by depicting the
interactions of the characters over time. Each character is represented by an
x-monotone curve from left to right, and a meeting is represented by having the
curves of the participating characters run close together for some time. There
have been various approaches to drawing storyline visualizations in an
automated way. In order to keep the visual complexity low, rather than
minimizing pairwise crossings of curves, we count block crossings, that is,
pairs of intersecting bundles of lines.
Partly inspired by the ILP-based approach of Gronemann et al. [GD 2016] for
minimizing the number of pairwise crossings, we model the problem as a
satisfiability problem (since the straightforward ILP formulation becomes more
complicated and harder to solve). Having restricted ourselves to a decision
problem, we can apply powerful SAT solvers to find optimal drawings in
reasonable time. We compare this SAT-based approach with two exact algorithms
for block crossing minimization, using both the benchmark instances of
Gronemann et al. and random instances. We show that the SAT approach is
suitable for real-world instances and identify cases where the other algorithms
are preferable.Comment: Appears in the Proceedings of the 25th International Symposium on
Graph Drawing and Network Visualization (GD 2017
Spindle configuration of in vitro matured bovine oocytes vitrified and warmed in media supplemented with a biopolymer produced by an Antarctic bacterium
Biological molecules isolated from organisms that live under subfreezing conditions could be used to protect oocytes from cryoinjuries suffered during cryopreservation. Bacterial exopolysaccharides (EPS) constitute a common class of molecules that interact with ice in nature either by triggering ice nucleation or by inhibition of ice nucleation and growth. The aim of this work was to evaluate the spindle configuration of in vitro matured bovine oocytes vitrified/warmed in media supplemented with exopolysaccharide (M1) produced by Pseudomonas sp ID1 (Carrión et al., Carbohydr Polym 117:1028. 2015). After 22 h of in vitro maturation, a total of 546 oocytes form prepubertal (3 replicates) and 405 oocytes from adult cows (4 replicates) were vitrified/warmed in media supplemented with various concentrations of EPS M1 (0, 0.001, 0.01, 0.1 and 1 mg/ml). After warming, oocytes were allowed to recover for 2 additional hours in IVM medium. Fresh, non-vitrified oocytes were used as a control. At 24 h of IVM, oocytes from all treatments were fixed and immunostained with the Alexa-fluor 488 antibody and DAPI. Microtubule and chromosome distribution was analyzed by immunocytochemistry under a fluorescent microscope. ANOVA was performed to analyze differences in meiotic spindle configuration (P < 0.05). When cow oocytes were vitrified, similar percentages of normal spindle configuration were observed when compared to fresh control oocytes, except for the 0.1 mg/ml EPS M1 group that showed significantly lower rates compared to the fresh control group. Significantly higher rates of prepubertal oocytes exhibiting a normal spindle configuration were recorded in the non-vitrified group compared to all vitrified/warmed groups, regardless of the EPS M1 supplementation. However, the addition of EPS M1 to the vitrification/warming media decreased the ratio of decondensation or absence of chromosomes and microtubules in prepubertal oocytes. Although percentages of normal spindle configuration after vitrification were lower for prepubertal than for cow oocytes, no significant differences were observed when oocytes were vitrified with 0.001, 0.1 and 1 mg/ml EPS M1. In conclusion, supplementation with EPS M1 concentrations during vitrification and warming did not induce adverse changes in the spindle of bovine oocytes, regardless of the concentration used. Although a more severe damage on spindle configuration could be observed after vitrification of prepubertal oocytes, EPS supplementation during vitrification and warming seems to have a greater benefit during vitrification of prepubertal than adult bovine oocytes. Further experiments are required to investigate if in vitro-matured oocytes vitrified/warmed in presence EPS M1 can improve their development competence after being vitrified/warmed. This study was supported by the Spanish Ministry of Science and Innovation (Project AGL2016-79802-P and grant CTQ2014-59632-R)
On dispersion relations and the statistical mechanics of Hawking radiation
We analyze the interplay between dispersion relations for the spectrum of
Hawking quanta and the statistical mechanics of such a radiation. We first find
the general relation between the occupation number density and the energy
spectrum of Hawking quanta and then study several cases in details. We show
that both the canonical and the microcanonical picture of the evaporation lead
to the same linear dispersion relation for relatively large black holes. We
also compute the occupation number obtained by instead assuming that the
spectrum levels out (and eventually falls to zero) for very large momenta and
show that the luminosity of black holes is not appreciably affected by the
modified statistics.Comment: LaTeX, 12 pages, 6 eps figures included, final version to appear in
Class. Quantum Gravit
Charge density distributions and related form factors in neutron-rich light exotic nuclei
Charge form factors corresponding to proton density distributions in exotic
nuclei, such as He, Li, B and Be are calculated
and compared. The results can be used as tests of various theoretical models
for the exotic nuclei structure in possible future experiments using a
colliding electron-exotic nucleus storage ring. The result of such a comparison
would show the effect of the neutron halo or skin on the proton distributions
in exotic nuclei.Comment: 11 pages, 4 figures, to be published in International Journal of
Modern Physics
Tracking Curvaton(s)?
The ratio of the curvaton energy density to that of the dominant component of
the background sources may be constant during a significant period in the
evolution of the Universe. The possibility of having tracking curvatons, whose
decay occurs prior to the nucleosynthesis epoch, is studied. It is argued that
the tracking curvaton dynamics is disfavoured since the value of the curvature
perturbations prior to curvaton decay is smaller than the value required by
observations. It is also argued, in a related context, that the minimal
inflationary curvature scale compatible with the curvaton paradigm may be
lowered in the case of low-scale quintessential inflation.Comment: 20 pages, 4figure
The environment effect on operation of in-vessel mirrors for plasma diagnostics in fusion devices
First mirrors will be the plasma facing components of optical diagnostic
systems in ITER. Mirror surfaces will undergo modification caused by erosion
and re-deposition processes [1,2]. As a consequence, the mirror performance may
be changed and may deteriorate [3,4]. In the divertor region it may also be
obscured by deposition [5-7]. The limited access to in-vessel components of
ITER calls for testing the mirror materials in present day devices in order to
gather information on the material damage and degradation of the mirror
performance, i.e. reflectivity. A dedicated experimental programme, First
Mirror Test (FMT), has been initiated at the JET tokamak within the framework
Tritium Retention Studies (TRS).Comment: 12th International Congress on Plasma Physics, 25-29 October 2004,
Nice (France).Submitted by B. Schunke on behalf of V. Voytseny
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