468 research outputs found
ISIS: a new N-body cosmological code with scalar fields based on RAMSES. Code presentation and application to the shapes of clusters
Several extensions of the standard cosmological model include scalar fields
as new degrees of freedom in the underlying gravitational theory. A particular
class of these scalar field theories include screening mechanisms intended to
hide the scalar field below observational limits in the solar system, but not
on galactic scales, where data still gives freedom to find possible signatures
of their presence. In order to make predictions to compare with observations
coming from galactic and clusters scales (i.e. in the non-linear regime of
cosmological evolution), cosmological N-body simulations are needed, for which
codes that can solve for the scalar field must be developed. We present a new
implementation of scalar-tensor theories of gravity which include screening
mechanisms. The code is based in the already existing code RAMSES, to which we
have added a non-linear multigrid solver that can treat a large class of scalar
tensor theories of modified gravity. We present details of the implementation
and the tests that we made to it. As application of the new code, we have
studied the influence that two particular modified gravity theories, the
symmetron and gravity, have on the shape of cluster sized dark matter
halos and found consistent results with previous estimations made with a static
analysis.Comment: 13 pages, 6 figures, matches version accepted for publication in A&
Hydrodynamic Effects in the Symmetron and -gravity Models
In this paper we present the first results from implementing two
scalar-tensor modified gravity theories, the symmetron and the Hu-Sawicki
-gravity model, into a hydrodynamic N-body code with dark matter
particles and a baryonic ideal gas. The study is a continuation of previous
work where the symmetron and have been successfully implemented in the
RAMSES code, but for dark matter only. By running simulations, we show that the
deviation from CDM in these models for the gas density profiles are
significantly lower than the dark matter equivalents. When it comes to the
matter power-spectrum we find that hydrodynamic simulations agree very well
with dark matter only simulations as long as we consider scales larger than
h/Mpc. In general the effects of modified gravity on the baryonic
gas is found to not always mirror the effects it has on the dark matter. The
largest signature is found when considering temperature profiles. We find that
the gas temperatures in the modified gravity model studied here show
deviations, when compared to CDM, that can be a factor of a few larger
than the deviations found in density profiles and power spectra.Comment: 11 pages, 10 figures, submitted to MNRA
Sobre la posible existencia de indicadores polÃnicos en mieles argentinas de importación
Se estudia el espectro pol i nice de doce muestras de miel importada de Argentina. Los pr incipal es taxones en ellas representados son los siguientes: Eucal yptus, Helianthus , Echium, Fabaceae , Umbeliferae y Carduus. En al gunas muestras se detecta l a presencia de granos de polen pertenecientes a ciertas Onograceae y Polygonaceae que pueden ser útiles para di stinguir estas mieles de las de origen españolThe pollen spectrum of twelve samples of honey f r om Argentina were studied . The m a in taxa present were found to be : Eucalypt us, Helianthus 1 Echi um 1 Fabaceae 1 Umbellif erae y Carduus o In some samples the presence of pol l en grains belonging to certain Onograceae and Polygonaceae were encountered and t hese taxa are considered to be useful cr i teria to distinguish this han e y from that of Spanish ori gin
Conocimiento de matemáticas y la competencia de reconocer el desarrollo del razonamiento "up and down" en los estudiantes
El objetivo de este estudio es aportar información sobre el papel que desempeña el conocimiento de matemáticas de los estudiantes para maestro (EPM) cuando piensan en el aprendizaje de las matemáticas de los estudiantes de primaria. Nuestro estudio se centra en el razonamiento "up and down" que es una de las componentes que facilitan el desarrollo del razonamiento proporcional. 92 EPM resolvieron una tarea en la que tenÃan que interpretar las respuestas de estudiantes de educación primaria a un problema que implicaba el razonamiento "up and down". Identificamos tres perfiles de EPM caracterizados por la relación entre el conocimiento de matemáticas y la competencia de reconocer el desarrollo del razonamiento up and down en los estudiantes
Comment on "Theory of tailoring sonic devices: Diffraction dominates over refraction"
Recently N. Garcia et al. (Phys. Rev. E 67, 046606 (2003)) theoretically
studied several acoustic devices with dimensions on de order of several
wavelenghts. The authors discussed on experimental results previously reported
by several of us (F. Cervera et al., Phys. Rev. Lett. 88, 023902 (2002)). They
concluded that diffraction and not refraction is the ominating mechanism that
explain the focusing effects observed in those experiments. In this Comment we
reexamined their calculations and discussed why some of their interpretations
of our results are misleading.Comment: 2 pages, 2 figures, a comment on an articl
The Variable Scale Evacuation Model (VSEM): a new tool for simulating massive evacuation processes during volcanic crises
Volcanic eruptions are among the most awesome and powerful displays of nature's force, constituting a major natural hazard for society (a single eruption can claim thousands of lives in an instant). Consequently, assessment and management of volcanic risk have become critically important goals of modern volcanology. Over recent years, numerous tools have been developed to evaluate volcanic risk and support volcanic crisis management: probabilistic analysis of future eruptions, hazard and risk maps, event trees, etc. However, there has been little improvement in the tools that may help Civil Defense officials to prepare Emergency Plans. Here we present a new tool for simulating massive evacuation processes during volcanic crisis: the Variable Scale Evacuation Model (VSEM). The main objective of the VSEM software is to optimize the evacuation process of Emergency Plans during volcanic crisis. For this, the VSEM allows the simulation of an evacuation considering different strategies depending on diverse impact scenarios. VSEM is able to calculate the required time for the complete evacuation taking into account diverse evacuation scenarios (number and type of population, infrastructure, road network, etc.) and to detect high-risk or "blackspots" of the road network. The program is versatile and can work at different scales, thus being capable of simulating the evacuation of small villages as well as huge cities
Lopsidedness of cluster galaxies in modified gravity
We point out an interesting theoretical prediction for elliptical galaxies
residing inside galaxy clusters in the framework of modified Newtonian dynamics
(MOND), that could be used to test this paradigm. Apart from the central
brightest cluster galaxy, other galaxies close enough to the centre experience
a strong gravitational influence from the other galaxies of the cluster. This
influence manifests itself only as tides in standard Newtonian gravity, meaning
that the systematic acceleration of the centre of mass of the galaxy has no
consequence. However, in the context of MOND, a consequence of the breaking of
the strong equivalence principle is that the systematic acceleration changes
the own self-gravity of the galaxy. We show here that, in this framework,
initially axisymmetric elliptical galaxies become lopsided along the external
field's direction, and that the centroid of the galaxy, defined by the outer
density contours, is shifted by a few hundreds parsecs with respect to the
densest point.Comment: accepted for publication in JCA
Research on the Friction Properties of DP600 Stainless Steel as a Function of Bending Angle and Pin Diameter
[EN] The rapid evolution of materials and manufacturing processes, driven by global competition and new safety and environmental regulations has had an impact on automotive structures (Body In White; BIW) manufacturing. The need for lighter vehicles, with more equipment, that are safer and eco-friendly at the same time, relates to the entire life cycle of the car. Car and steelmakers agree that weight reduction is possible, and the solution involves the use of new advanced high-strength steels. Thinner and stronger materials lead to higher demands on stamping, the most used manufacturing in BIW parts. The use of advanced high-strength steels raises new challenges, especially concerning the lubrication between the die and the sheet. To study the lubrication conditions of the stamping process, a sheet metal forming a simulator was developed. The simulator consists of two cylinders that pull the strip of steel and a pin in between. The angle between the cylinders can be adjusted from 0 to 90 degrees, which allows analysis of the effect of the stamping angle. The pull force and velocity can be set and measured, and the peripheric pin velocity, the strain, and the strain velocity can be measured as well. In this work, the tribological properties of Dual-Phase 600 stainless steel using different processing conditions have been analyzed. To this end, a factorial experiments design with twelve parameters that compare the behavior of different angles and diameters was run. The results showed that the friction coefficient increases by increasing the bending angle and decreases with pin diameter.Sanchez-Caballero, S.; Sellés, M.; Pla-Ferrando, R.; Segui Llinares, VJ.; Peydro, MA. (2021). Research on the Friction Properties of DP600 Stainless Steel as a Function of Bending Angle and Pin Diameter. Materials Proceedings. 3(1):1-7. https://doi.org/10.3390/IEC2M-09248173
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