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Artigos de revistas sobre o tema "Analyse de distribution angulaire"

Autor: Grafiati

Publicado: 5 de outubro de 2024

Última modificação: 31 de julho de 2025

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1

Phani, Yedlapalli, S.V.S.Girija, Dattatreya Rao A.V., and V. L. N. Srihari G. "Symmetric Circular Model Induced by Inverse Stereographic Projection On Double Weibull Distribution with Application." International Journal of Soft Computing, Mathematics and Control (IJSCMC) 4, no. 1 (2015): 67–74. https://doi.org/10.14810/ijscmc.2015.4106.

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In practical life usually we come across angular or periodic data which needs distributions that are invariant of zero direction and sense of rotation for analysis. Inverse stereographic projection/ Bilinear transformation defined by a one to one mapping generate a class of probability distributions on unit circle that are flexible to analyse circular data. The probability density f unction of many life testing models ranges from 0 to ∞ . Aiming to construct new circular model by applying Inverse Stereographic Projection, we consider Double Weibull distribution and derive density, distri

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EL, KHIDER Abdelkader, and Hanaa IMICHOUI. "Health public expenditure in Morocco: Equity-based governance." African Scientific Journal Vol 3, N° 12 (2022): 356. https://doi.org/10.5281/zenodo.6861124.

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<strong>Résumé </strong> L’objectif de ce travail est d’analyser le lien entre le financement public de la santé sur et croissance économique au Maroc. La revue de littérature laisse suggérer que l’amélioration de l’état de santé de la population notamment par le biais d’un financement public et d’une facilitation de l’accès aux services de santé ; favorise une plus grande productivité et partant ; la croissance économique. En effet, le financement publ

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Turner, Jordan A., Daniel A. Dale, Janice C. Lee, et al. "PHANGS–HST: star cluster spectral energy distribution fitting with cigale." Monthly Notices of the Royal Astronomical Society 502, no. 1 (2021): 1366–85. http://dx.doi.org/10.1093/mnras/stab055.

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ABSTRACT The sensitivity and angular resolution of photometric surveys executed by the Hubble Space Telescope (HST) enable studies of individual star clusters in galaxies out to a few tens of megaparsecs. The fitting of spectral energy distributions (SEDs) of star clusters is essential for measuring their physical properties and studying their evolution. We report on the use of the publicly available Code Investigating GALaxy Emission (cigale) SED fitting package to derive ages, stellar masses, and reddenings for star clusters identified in the Physics at High Angular resolution in Nearby Gala

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Danilovich, T., A. M. S. Richards, L. Decin, M. Van de Sande, and C. A. Gottlieb. "An ALMA view of SO and SO2 around oxygen-rich AGB stars." Monthly Notices of the Royal Astronomical Society 494, no. 1 (2020): 1323–47. http://dx.doi.org/10.1093/mnras/staa693.

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ABSTRACT We present and analyse SO and SO2, recently observed with high angular resolution and sensitivity in a spectral line survey with ALMA, for two oxygen-rich AGB stars: the low mass-loss rate R Dor and high mass-loss rate IK Tau. We analyse 8 lines of SO detected towards both stars, 78 lines of SO2 detected towards R Dor, and 52 lines of SO2 detected towards IK Tau. We detect several lines of 34SO, 33SO, and 34SO2 towards both stars, and tentatively S18O towards R Dor, and hence derive isotopic ratios for these species. The spatially resolved observations show us that the two sulphur oxi

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Amarante, João A. S., and Helio J. Rocha-Pinto. "Planetary populations according to the orbital angular momentum." Proceedings of the International Astronomical Union 5, S265 (2009): 420–21. http://dx.doi.org/10.1017/s1743921310001122.

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AbstractWe investigate the angular momentum distribution of known exoplanetary systems, as a function of the planetary mass, orbital semimajor axis and metallicity of the host star. We find exoplanets seems to be classified according to at least two ‘populations’, with respect to their angular momentum properties. This classification is independent on the composition of the planet and seems to be valid for both jovian and neptunian planets, and probably can be extrapolated to the terrestrial planets of the Solar System. We analyse these ‘populations’ considering the phenomenon of planetary mig

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Ferrero, Alejandro, and Joaquín Campos. "Angular and Spectral Bandwidth Considerations in BRDF Measurements of Interference- and Diffraction-Based Coatings." Coatings 10, no. 11 (2020): 1128. http://dx.doi.org/10.3390/coatings10111128.

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The Bidirectional Reflectance Distribution Function (BRDF) of iridescent (or goniochromatic) surfaces may vary notably with both spectral and angular variables, and, therefore, finite spectral bandwidth and collection solid angles inherent to any measuring instrument introduce a deviation from the correct value. Experimental data of highly goniochromatic samples are used to analyse their impact on measurement uncertainty. The results indicate that it is advisable to standardize spectral and angular bandwidths because the systematic error is not negligible for typical measuring systems. The 95t

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Malcoci, Iulian, and Marin Guțu. "ROCKER MECHANISM FROM CLASSICAL TO MODERN KINEMATICAL ANALYSIS." Journal of Engineering Science XXVII (3) (September 15, 2020): 54–64. https://doi.org/10.5281/zenodo.3949664.

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Kinematical mechanism analysis is usually used for motion study or to simulate and analyse the movement of mechanical assemblies and the whole mechanism. In this paper we will consider kinematical analysis regarding the rocker mechanism which is commonly used in a cross planer machine tool without taking into account forces that cause the mechanism motion. The authors have used a calculation model and a calculation algorithm that allowed the definition of kinematic parameters of the mechanism, including linear velocities and acceleration, angular speeds and acceleration. The calculations were

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D.Pise, Dhanashree, and Dr Himadri Majumder. "DESIGN MODIFICATIONS OF CYLINDER HEAD FINS FOR TWO-WHEELER ENGINE THROUGH GEOMETRICAL AND MATERIAL ANALYSIS." International Journal of Engineering Applied Sciences and Technology 10, no. 01 (2025): 121–27. https://doi.org/10.33564/ijeast.2025.v10i01.018.

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__The main aim of this work is to analyse and simulate engine fin geometry and type of material used for two wheeler engine for Honda SP 125 cylinder fins on temperature distribution and heat flux. we have used fins with various geometries such rectangular, rectangular with slot circular, circular with slot, angular, longitudinal fins of 2.5 mm thickness. Results showed as circular with perforation has good heat transfer rate as well as good power to weight ratio. Depending on this geometry, materials Aluminium 6082, AL204, cast iron, Mg alloy, AZ31, Beryllium oxide materials were analysed and

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Rasouli, Soleiman, A. N. Behkami, R. Razavi, Amir Abbas Sabouri Dodaran, and M. R. Bayati. "Investigation on Neutron-Induced Fission Fragment Angular Distribution of 232Th and 238U." Zeitschrift für Naturforschung A 73, no. 11 (2018): 1075–81. http://dx.doi.org/10.1515/zna-2018-0267.

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AbstractFission fragment angular distribution (FFAD) data would help obtain new insights into both the fission process and the mechanism of the projectile’s interaction with the nucleus. Recently, a structure has been reported in neutron-induced FFAD of even-even actinide nuclei near threshold. Statistical modelling is used in this article to analyse FFAD from neutron-induced fission of 238U and 232Th. The statistical variance K02 is obtained by fitting the measured fragment anisotropies with a theoretical model. Accurate analysis is performed to deduce the variance K02 of the K-distribution o

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Katona, M., K. Trampert, C. Schwanengel, U. Krüger, and C. Neumann. "Geometric system analysis of ILMD-based LID measurement systems using Monte-Carlo simulation." Journal of Physics: Conference Series 2149, no. 1 (2022): 012015. http://dx.doi.org/10.1088/1742-6596/2149/1/012015.

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Abstract Imaging Luminance Measuring Device (ILMD) based luminous intensity distribution measurement systems are an established method for measuring the luminous intensity distribution (LID) of light sources in the far field. The advantage of this system is the high-resolution acquisition of a large angular range with one image. For the uncertainty budget, the mathematical description of the system can be divided into photometric and geometric contributions. In the following, we will present a Monte-Carlo approach to analyse the geometric contributions which are the uncertainty of measurement

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Pedrosa, Susana, Patricia Tissera та Cecilia Scannapieco. "Baryons and Dark Matter halo distributions in ΛCDM Cosmology". Proceedings of the International Astronomical Union 5, S262 (2009): 404–5. http://dx.doi.org/10.1017/s1743921310003431.

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AbstractWe analyse the dark matter (DM) distribution in a ≈1012M⊙ halo extracted from a simulation consistent with the concordance cosmology, where the physics regulating the transformation of gas into stars was allowed to change producing galaxies with different morphologies. Although the DM profiles get more concentrated as baryons are collected at the centre of the haloes compared to a pure dynamical run, the total baryonic mass alone is not enough to fully predict the reaction of the DM profile. Our findings suggest that the response of the DM halo is driven by the history of assembly of b

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Du, Hangci, Shude Mao, E. Athanassoula, Juntai Shen, and Pawel Pietrukowicz. "Kinematics of RR Lyrae stars in the Galactic bulge with OGLE-IV and Gaia DR2." Monthly Notices of the Royal Astronomical Society 498, no. 4 (2020): 5629–42. http://dx.doi.org/10.1093/mnras/staa2601.

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ABSTRACT We analyse the kinematics and spatial distribution of 15 599 fundamental-mode RR Lyrae (RRL) stars in the Milky Way bulge by combining OGLE-IV photometric data and Gaia DR2 proper motions. We show that the longitudinal proper motions and the line-of-sight velocities can give similar results for the rotation in the Galactic central regions. The angular velocity of bulge RRLs is found to be around 35 km s−1 kpc−1, significantly smaller than that for the majority of bulge stars (50–60 km s−1 kpc−1); bulge RRLs have larger velocity dispersion (120–140 km s−1) than younger stars. The depen

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Wan, Zhen, William H. Oliver, Geraint F. Lewis, Justin I. Read, and Michelle L. M. Collins. "On the origin of the asymmetric dwarf galaxy distribution around andromeda." Monthly Notices of the Royal Astronomical Society 492, no. 1 (2019): 456–67. http://dx.doi.org/10.1093/mnras/stz3477.

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ABSTRACT The dwarf galaxy distribution surrounding M31 is significantly anisotropic in nature. Of the 30 dwarf galaxies in this distribution, 15 form a disc-like structure and 23 are contained within the hemisphere facing the Milky Way. Using a realistic local potential, we analyse the conditions required to produce and maintain these asymmetries. We find that some dwarf galaxies are required to have highly eccentric orbits in order to preserve the presence of the hemispherical asymmetry with an appropriately large radial dispersion. Under the assumption that the dwarf galaxies originate from

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van Gils, Dennis P. M., Sander G. Huisman, Siegfried Grossmann, Chao Sun, and Detlef Lohse. "Optimal Taylor–Couette turbulence." Journal of Fluid Mechanics 706 (July 3, 2012): 118–49. http://dx.doi.org/10.1017/jfm.2012.236.

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AbstractStrongly turbulent Taylor–Couette flow with independently rotating inner and outer cylinders with a radius ratio of $\eta = 0. 716$ is experimentally studied. From global torque measurements, we analyse the dimensionless angular velocity flux ${\mathit{Nu}}_{\omega } (\mathit{Ta}, a)$ as a function of the Taylor number $\mathit{Ta}$ and the angular velocity ratio $a= \ensuremath{-} {\omega }_{o} / {\omega }_{i} $ in the large-Taylor-number regime $1{0}^{11} \lesssim \mathit{Ta}\lesssim 1{0}^{13} $ and well off the inviscid stability borders (Rayleigh lines) $a= \ensuremath{-} {\eta }^{

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Collier, Angela, Isaac Shlosman, and Clayton Heller. "Dark matter bars in spinning haloes." Monthly Notices of the Royal Astronomical Society 488, no. 4 (2019): 5788–801. http://dx.doi.org/10.1093/mnras/stz2144.

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ABSTRACT We study non-linear response of spinning dark matter (DM) haloes to dynamic and secular evolution of stellar bars in the embedded galactic discs, using high-resolution numerical simulations. For a sequence of haloes with the cosmological spin parameter λ = 0–0.09, and a representative angular momentum distribution, we analyse evolution of induced DM bars amplitude and quantify parameters of the response as well as trapping of DM orbits and angular momentum transfer by the main and secondary resonances. We find that (1) maximal amplitude of DM bars depends strongly on λ, while that of

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Dodd, Emma, Amina Helmi, and Helmer H. Koppelman. "Substructures, resonances, and debris streams." Astronomy & Astrophysics 659 (March 2022): A61. http://dx.doi.org/10.1051/0004-6361/202141354.

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Context. The local stellar halo of the Milky Way contains the debris from several past accretion events. Aims. Here we study in detail the structure and properties of nearby debris associated with the Helmi streams, which was originally identified as an overdensity in integrals of motion space. Methods. We use 6D phase-space information from Gaia EDR3 combined with spectroscopic surveys, and we analyse the orbits and frequencies of the stars in the streams using various Galactic potentials. We also explore how the Helmi streams constrain the flattening, q, of the Galactic dark matter halo. Res

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Walo-Martín, D., J. Falcón-Barroso, C. Dalla Vecchia, I. Pérez та A. Negri. "Kinematic analysis of eagle simulations: evolution of λRe and its connection with mergers and gas accretion". Monthly Notices of the Royal Astronomical Society 494, № 4 (2020): 5652–65. http://dx.doi.org/10.1093/mnras/staa1066.

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ABSTRACT We have developed a new tool to analyse galaxies in the eagle simulations as close as possible to observations. We investigated the evolution of their kinematic properties by means of the angular momentum proxy parameter, λRe, for galaxies with M⋆ ≥ 5 × 109 M⊙ in the RefL0100N1504 simulation up to redshift two (z = 2). Galaxies in the simulation show a wide variety of kinematic features, similiar to those found in integral-field spectroscopic studies. At z = 0 the distribution of galaxies in the λRe–ε plane is also in good agreement with results from observations. Scaling relations at

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Colombo, D., A. Duarte-Cabral, A. R. Pettitt, et al. "The SEDIGISM survey: The influence of spiral arms on the molecular gas distribution of the inner Milky Way." Astronomy & Astrophysics 658 (January 31, 2022): A54. http://dx.doi.org/10.1051/0004-6361/202141287.

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The morphology of the Milky Way is still a matter of debate. In order to shed light on uncertainties surrounding the structure of the Galaxy, in this paper, we study the imprint of spiral arms on the distribution and properties of its molecular gas. To do so, we take full advantage of the SEDIGISM (Structure, Excitation, and Dynamics of the Inner Galactic Interstellar Medium) survey that observed a large area of the inner Galaxy in the 13CO (2–1) line at an angular resolution of 28′′. We analyse the influences of the spiral arms by considering the features of the molecular gas emission as a wh

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Irodotou, Dimitrios, and Peter A. Thomas. "Using angular momentum maps to detect kinematically distinct galactic components." Monthly Notices of the Royal Astronomical Society 501, no. 2 (2020): 2182–97. http://dx.doi.org/10.1093/mnras/staa3804.

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ABSTRACT In this work, we introduce a physically motivated method of performing disc/spheroid decomposition of simulated galaxies, which we apply to the eagle sample. We make use of the healpix package to create Mollweide projections of the angular momentum map of each galaxy’s stellar particles. A number of features arise on the angular momentum space which allows us to decompose galaxies and classify them into different morphological types. We assign stellar particles with angular separation of less/greater than 30° from the densest grid cell on the angular momentum sphere to the disc/sphero

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Cui, Baoli, Yongjun Cheng, Pengyang Jia, et al. "Temperature Field Analysis and Temperature Control of Vacuum Ultra High Speed Angular Contact Ball Bearings." Journal of Physics: Conference Series 2784, no. 1 (2024): 012009. http://dx.doi.org/10.1088/1742-6596/2784/1/012009.

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Abstract In order to investigate the temperature field distribution of bearings under vacuum and ultra-high-speed conditions and put forward a good temperature control method, this paper adopts the local method to analyse and calculate the temperature of various parts of the bearing, and establishes a simulation model of the bearing by using the finite element analysis method of ANSYS, and carries out a test on the experimental platform of the vacuum and ultra-high-speed motors, which proves that the temperature of the rollers is the highest, followed by the inner-ring raceway and the outer-ri

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Chakraborty, Arnab, Prasun Dutta, Abhirup Datta, and Nirupam Roy. "The study of the angular and spatial distribution of radio-selected AGNs and star-forming galaxies in the ELAIS N1 field." Monthly Notices of the Royal Astronomical Society 494, no. 3 (2020): 3392–404. http://dx.doi.org/10.1093/mnras/staa945.

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ABSTRACT The cosmic evolution of bias of different source populations with underlying dark matter density field in post-reionization era can shed light on large-scale structures. Studying the angular and spatial distribution of different compact sources using deep radio catalogue at low frequency is essential to understand the matter distribution of the present Universe. Here, we investigate the relationship of luminous matter with their host dark matter haloes by measuring the angular and spatial clustering of sources (two-point statistics), using deep radio observation of ELAIS N1 (EN1) fiel

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Alamo-Martínez, Karla A., Ana L. Chies-Santos, Michael A. Beasley, et al. "Globular cluster systems of relic galaxies." Monthly Notices of the Royal Astronomical Society 503, no. 2 (2021): 2406–22. http://dx.doi.org/10.1093/mnras/stab538.

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ABSTRACT We analyse the globular cluster (GC) systems of a sample of 15 massive, compact early-type galaxies (ETGs), 13 of which have already been identified as good relic galaxy candidates on the basis of their compact morphologies, old stellar populations and stellar kinematics. These relic galaxy candidates are likely the nearby counterparts of high-redshift red nugget galaxies. Using F814W (≈I) and F160W (≈H) data from the WFC3 camara onboard the Hubble Space Telescope, we determine the total number, luminosity function, specific frequency, colour, and spatial distribution of the GC system

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Gallego-Cano, E., R. Schödel, H. Dong, et al. "The distribution of stars around the Milky Way’s central black hole." Astronomy & Astrophysics 609 (December 22, 2017): A26. http://dx.doi.org/10.1051/0004-6361/201730451.

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Context. The existence of dynamically relaxed stellar density cusps in dense clusters around massive black holes is a long-standing prediction of stellar dynamics, but it has so far escaped unambiguous observational confirmation. Aims. In this paper we aim to revisit the problem of inferring the innermost structure of the Milky Way’s nuclear star cluster via star counts, to clarify whether it displays a core or a cusp around the central black hole. Methods. We used judiciously selected adaptive optics assisted high angular resolution images obtained with the NACO instrument at the ESO VLT. Thr

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Chauvineau, J. P., and F. Bridou. "Analyse angulaire de la fluorescence du fer dans une multicouche périodique Fe/C." Le Journal de Physique IV 06, no. C7 (1996): C7–53—C7–64. http://dx.doi.org/10.1051/jp4:1996707.

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Beugre, Jean-Bertin, Moussa Diomande, Assi Raoul Assi, Mariam Kadi Koueita, and Frédéric Vaysse. "Analyse photogrammétrique angulaire et évaluation esthétique faciale de jeunes ivoiriens en normocclusion dentaire." International Orthodontics 15, no. 1 (2017): 25–39. http://dx.doi.org/10.1016/j.ortho.2016.12.016.

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Ema, Sonia Akter, Md Rasel Hossen, Krzysztof Bolejko, and Geraint F. Lewis. "The density distributions of cosmic structures: impact of the local environment on weak-lensing convergence." Monthly Notices of the Royal Astronomical Society 509, no. 2 (2021): 3004–14. http://dx.doi.org/10.1093/mnras/stab3134.

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ABSTRACT Whilst the underlying assumption of the Friedman-Lemaître-Robertson-Walker (FLRW) cosmological model is that matter is homogeneously distributed throughout the universe, gravitational influences over the life of the universe have resulted in mass clustered on a range of scales. Hence we expect that, in our inhomogeneous Universe, the view of an observer will be influenced by the location and local environment. Here, we analyse the one-point probability distribution functions and angular power spectra of weak-lensing (WL) convergence and magnification numerically to investigate the inf

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Du, Xu, Bin Wang, and Junqiang Zheng. "Geometric Error Analysis of a 2UPR-RPU Over-Constrained Parallel Manipulator." Machines 10, no. 11 (2022): 990. http://dx.doi.org/10.3390/machines10110990.

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For a 2UPR-RPU over-constrained parallel manipulator, some geometric errors result in internal forces and deformations, which limit the improvement of the pose accuracy of the moving platform and shorten the service life of the manipulator. Analysis of these geometric errors is important for restricting them. In this study, an evaluation model is established to analyse the influence of geometric errors on the limbs’ comprehensive deformations for this manipulator. Firstly, the nominal inverse and actual forward kinematics are analysed according to the vector theory and the local product of the

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Zhong, Zhimeng, Jianyao Zhao, and Chao Li. "Outdoor-to-Indoor Channel Measurement and Coverage Analysis for 5G Typical Spectrums." International Journal of Antennas and Propagation 2019 (September 16, 2019): 1–10. http://dx.doi.org/10.1155/2019/3981678.

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The fifth-generation (5G) mobile communications system will adopt the millimeter wave (mmWave) band for outdoor-to-indoor (O2I) coverage to achieve ultrahigh data rate. However, it is a challenging task because of the large path loss and almost total blocking by building walls. In this work, we performed extensive measurements on the O2I propagation at 3.5, 4.9, and 28 GHz simultaneously by using a multiband channel sounder. We captured the path loss distribution and angular power arrival profiles. We also measured the penetration loss at 28 GHz through different kinds of glass windows. The wi

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Tracheva, Natalya V., and Sergey A. Ukhinov. "Two-dimensional projection Monte Carlo estimators for the study of angular characteristics of polarized radiation." Russian Journal of Numerical Analysis and Mathematical Modelling 33, no. 3 (2018): 187–97. http://dx.doi.org/10.1515/rnam-2018-0016.

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Abstract The paper presents a Monte Carlo algorithm for the study of bidirectional angular characteristics of a scattered polarized radiation based on projection expansion of the density of the corresponding angular distribution over hemispherical harmonics. The results of numerical estimation of two-dimensional angular distributions of the intensity and the polarization degree of the radiation passed through and reflected from optically thick layers of scattering and absorbing substance are presented.

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Salmi, Tuomo, Valery F. Suleimanov, and Juri Poutanen. "Effects of Compton scattering on the neutron star radius constraints in rotation-powered millisecond pulsars." Astronomy & Astrophysics 627 (June 27, 2019): A39. http://dx.doi.org/10.1051/0004-6361/201935442.

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The aim of this work is to study the possible effects and biases on the radius constraints for rotation-powered millisecond pulsars when using Thomson approximation to describe electron scattering in the atmosphere models, instead of using exact formulation for Compton scattering. We compare the differences between the two models in the energy spectrum and angular distribution of the emitted radiation. We also analyse a self-generated, synthetic, phase-resolved energy spectrum, based on Compton atmosphere and the most X-ray luminous, rotation-powered millisecond pulsars observed by the Neutron

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Karatepe, Şule, İsmail Boztosun, and Mahmut Doğru. "Analysis of Elastic Scattering Angular Distributions of 11Be + 64Zn System: Compression with Different Models." Indian Journal of Science and Technology 12, no. 44 (2019): 01–04. http://dx.doi.org/10.17485/ijst/2019/v12i44/145523.

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Uegaki, E., and Y. Abe. "Resonances in 28Si + 28Si. II: --Analyses for the Angular Distributions and Angular Correlations--." Progress of Theoretical Physics 127, no. 5 (2012): 877–905. http://dx.doi.org/10.1143/ptp.127.877.

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Koppelman, Helmer H., Roy O. Y. Bos, and Amina Helmi. "The messy merger of a large satellite and a Milky Way-like galaxy." Astronomy & Astrophysics 642 (October 2020): L18. http://dx.doi.org/10.1051/0004-6361/202038652.

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Aims. About 10 billion years ago the Milky Way merged with a massive satellite, Gaia-Enceladus. To gain insight into the properties of its debris we analyse in detail a suite of simulations that includes an experiment that produces a good match to the kinematics of nearby halo stars inferred from Gaia data. Methods. We compare the kinematic distributions of stellar particles in the simulations and study the distribution of debris in orbital angular momentum, eccentricity, and energy, and its relation to the mass loss history of the simulated satellite. Results. We confirm that Gaia-Enceladus p

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Diomandé, Aboubacar Sidiki. "L’enfant soldat confronté au processus de désarmement, démobilisation et réinsertion (ddr)." Études internationales 44, no. 4 (2014): 567–95. http://dx.doi.org/10.7202/1024652ar.

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Résumé Cet article analyse le phénomène des enfants soldats à l’aune du processus de désarmement, démobilisation et réinsertion (ddr). Ce processus qui vise à réintégrer socialement les soldats tient-il compte spécifiquement de ces derniers ? Le constat demeure que, si l’enfant soldat est pris en considération par les programmes ddr, cette prise en compte reste lacunaire, faute d’intégration de certains facteurs constituant la pierre angulaire de son succès. C’est pourquoi cet article se propose de rendre plus efficaces les programmes ddr pour une meilleure réinsertion sociale de l’enfant sold

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Klein, Matthias, Holger Israel, Aarti Nagarajan, et al. "Weak lensing measurements of the APEX-SZ galaxy cluster sample." Monthly Notices of the Royal Astronomical Society 488, no. 2 (2019): 1704–27. http://dx.doi.org/10.1093/mnras/stz1491.

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ABSTRACT We present a weak lensing analysis for galaxy clusters from the APEX-SZ survey. For 39 massive galaxy clusters that were observed via the Sunyaev–Zel’dovich effect (SZE) with the APEX telescope, we analyse deep optical imaging data from WFI(@2.2mMPG/ESO) and Suprime-Cam(@SUBARU) in three bands. The masses obtained in this study, including an X-ray selected sub-sample of 27 clusters, are optimized for and used in studies constraining the mass to observable scaling relations at fixed cosmology. A novel focus of our weak lensing analysis is the multicolour background selection to suppres

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Wang, Jingxiu. "Analyses of Vector Magnetograms." International Astronomical Union Colloquium 141 (1993): 425–34. http://dx.doi.org/10.1017/s0252921100029559.

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Abstract(1) Current techniques may now permit an acceptable resolution of the 180 degree ambiguity in determining the direction of transverse fields. (2) The non-potentiality of active regions can be described by parameters of angular shear, source field, line-of-sight current, force-free factor and force-free current. A 2-dimensional description of angular shear is necessary, and an alternative, FFT method of calculating the line-of-sight current seems recommendable. (3) For a sampling region, the degree of non-potentiality quantified by all the parameters shows great enhancement right before

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Banet, Alon, Rennan Barkana, Anastasia Fialkov, and Or Guttman. "Quantiles as robust probes of non-Gaussianity in 21-cm images." Monthly Notices of the Royal Astronomical Society 503, no. 1 (2021): 1221–32. http://dx.doi.org/10.1093/mnras/stab318.

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ABSTRACT The epoch in which the first stars and galaxies formed is among the most exciting unexplored eras of the Universe. A major research effort is focused on probing this era with the 21-cm spectral line of hydrogen. While most research works focus on statistics like the 21-cm power spectrum or the sky-averaged global signal, there are other ways to analyse tomographic 21-cm maps, which may lead to novel insights. We suggest statistics based on quantiles as a method to probe non-Gaussianities of the 21-cm signal. We show that they can be used in particular to probe the variance, skewness,

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Khan, Md Ishaque, and Rajib Saha. "Isotropy statistics of CMB hot and cold spots." Journal of Cosmology and Astroparticle Physics 2022, no. 06 (2022): 006. http://dx.doi.org/10.1088/1475-7516/2022/06/006.

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Abstract Statistical Isotropy of the Cosmic Microwave Background (CMB) radiation has been studied and debated extensively in recent years. Under this assumption, the hot spots and cold spots of the CMB are expected to be uniformly distributed over a 2-sphere. We use the orientation matrix, first proposed by Watson (1965) and Scheidegger (1965) and associated shape and strength parameters (Woodcock, 1977) to analyse whether the hot and cold spots of the observed CMB temperature anisotropy field are uniformly placed. We demonstrate the usefulness of our estimators by using simulated toy models c

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Amard, L., A. Palacios, C. Charbonnel, et al. "First grids of low-mass stellar models and isochrones with self-consistent treatment of rotation." Astronomy & Astrophysics 631 (October 22, 2019): A77. http://dx.doi.org/10.1051/0004-6361/201935160.

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Aims.We present an extended grid of state-of-the art stellar models for low-mass stars including updated physics (nuclear reaction rates, surface boundary condition, mass-loss rate, angular momentum transport, rotation-induced mixing, and torque prescriptions). We evaluate the impact of wind braking, realistic atmospheric treatment, rotation, and rotation-induced mixing on the structural and rotational evolution from the pre-main sequence (PMS) to the turn-off.Methods.Using the STAREVOL code, we provide an updated PMS grid. We computed stellar models for seven different metallicities, from [Fe

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Powell, Devon, Simona Vegetti, John P. McKean, Cristiana Spingola, Francesca Rizzo, and Hannah R. Stacey. "A novel approach to visibility-space modelling of interferometric gravitational lens observations at high angular resolution." Monthly Notices of the Royal Astronomical Society 501, no. 1 (2020): 515–30. http://dx.doi.org/10.1093/mnras/staa2740.

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ABSTRACT We present a new gravitational lens modelling technique designed to model high-resolution interferometric observations with large numbers of visibilities without the need to pre-average the data in time or frequency. We demonstrate the accuracy of the method using validation tests on mock observations. Using small data sets with ∼103 visibilities, we first compare our approach with the more traditional direct Fourier transform (DFT) implementation and direct linear solver. Our tests indicate that our source inversion is indistinguishable from that of the DFT. Our method also infers le

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Malla, Janak Ratna, Walter Saurer, and B. Aryal. "Spatial orientations of angular momentum vectors of galaxies in Supercluster S [173+014+0082]." BIBECHANA 18, no. 1 (2021): 26–32. http://dx.doi.org/10.3126/bibechana.v18i1.29165.

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The spin vector orientation of 1302 SDSS (Sloan Digital Sky Survey) galaxies in Supercluster S[173+014+0082] having redshift 0.076 to 0.091 has been analysed. The positions, position angles and inclination angles of galaxies are used to convert two-dimensional observed parameters into three-dimensional angular momentum vectors of the galaxy using the `position angle-inclination' method. The expected isotropic distribution curves are determined performing numerical simulation by generating 107 virtual galaxies. The observed distribution is compared with the expected isotropic distribution curve

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KIM, YONG JOO, and MOON HOE CHA. "SECOND-ORDER EIKONAL MODEL ANALYSIS OF16O+16OELASTIC SCATTERING." International Journal of Modern Physics E 10, no. 04n05 (2001): 373–86. http://dx.doi.org/10.1142/s0218301301000563.

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We analyze the elastic scattering angular distributions of the16O +16O system at Elab=480 MeV and 704 MeV within the framework of the second-order eikonal model based on Coulomb trajectories of colliding nuclei. The diffractive oscillatory structure observed in the elastic angular distribution could be explained due to the interference between the near- and far-side scattering amplitudes. The presence of a nuclear rainbow in this system is evidenced through a classical deflection function. The effective optical potential is developed from the second-order non-eikonal phase shifts.

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Godin, Laurence. "Entre plaisir et contrôle." Ethnologies 33, no. 2 (2013): 69–97. http://dx.doi.org/10.7202/1015026ar.

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Cet article traite du lien qui existe entre les habitudes alimentaires et les discours normatifs sur l’alimentation. La notion d’équilibre est le point central autour duquel s’organise l’opposition entre plaisir et contrôle. Les conclusions tirées de cet article proviennent d’une série d’entretiens menés auprès d’individus qui font de l’entraînement physique sur une base régulière. Pour eux, l’équilibre s’obtient par les pratiques alimentaires, mais surtout par la mise en oeuvre du dosage entre plaisir et contrôle. Selon l’auteur, le lien social est la pierre angulaire de cet équilibre et son

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Mollerach, S., E. Roulet, and O. Taborda. "Large-scale anisotropies of extragalactic cosmic rays below the ankle." Journal of Cosmology and Astroparticle Physics 2022, no. 12 (2022): 021. http://dx.doi.org/10.1088/1475-7516/2022/12/021.

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Abstract We study the anisotropies on large angular scales which can be present in the flux of cosmic rays reaching the Earth from a population of extragalactic sources, focusing on the energy range between the second knee and the ankle. In this energy range the particles are significantly affected by the Galactic magnetic field, which then plays a relevant role in shaping the expected anisotropies. The Galactic magnetic field deflects the cosmic-ray trajectories and thus modifies the anisotropies present outside the halo of the Galaxy, in particular the dipolar one associated with the transla

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Tsuji, Kyoko, Naoto Haruyama, Shunsuke Nomura, et al. "Characteristics of craniofacial morphology and factors affecting them in patients with isolated cleft palate." PeerJ 9 (April 20, 2021): e11297. http://dx.doi.org/10.7717/peerj.11297.

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Background Myriad maxillo-mandibular occlusal relationships are observed in patients with isolated cleft palate (ICP), unlike in patients with other cleft types, such as cleft lip and palate. Objectives This study aimed to categorise the characteristics of craniofacial morphology in patients with ICP, and investigate the clinical factors affecting these categorised morphological characteristics. Methods Thirty-six girls with ICP (age (mean ± SD): 5.36 ± 0.36 years) underwent cephalometric measurement. Their craniofacial morphology was categorised using cluster analysis. Profilograms were creat

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Tiongco, Maria A., Enrico Vesperini, and Anna Lisa Varri. "Kinematical evolution of multiple stellar populations in star clusters." Monthly Notices of the Royal Astronomical Society 487, no. 4 (2019): 5535–48. http://dx.doi.org/10.1093/mnras/stz1595.

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ABSTRACT We present the results of a suite of N-body simulations aimed at understanding the fundamental aspects of the long-term evolution of the internal kinematics of multiple stellar populations in globular clusters. Our models enable us to study the cooperative effects of internal, relaxation-driven processes and external, tidally induced perturbations on the structural and kinematic properties of multiple-population globular clusters. To analyse the dynamical behaviour of the multiple stellar populations in a variety of spin-orbit coupling conditions, we have considered three reference ca

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Chikuse, Yasuko. "The matrix angular central Gaussian distribution." Journal of Multivariate Analysis 33, no. 2 (1990): 265–74. http://dx.doi.org/10.1016/0047-259x(90)90050-r.

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Zhang, Yuxiang, Jianhua Zhang, Jian Zhang, Guangyi Liu, Yuan Zhang, and Yuan Yao. "A Theoretical Analysis of Favorable Propagation on Massive MIMO Channels with Generalized Angle Distributions." Electronics 11, no. 14 (2022): 2150. http://dx.doi.org/10.3390/electronics11142150.

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Massive MIMO obtains the multiuser performance gain based on the favorable propagation (FP) assumption, defined as the mutual orthogonality of different users’ channel vectors. Until now, most of the theoretical analyses of FP are based on uniform angular distributions and only consider the horizontal dimension. However, the real propagation channel contains full dimensions, and the spatial angle varies with the environment. Thus, it remains unknown whether the FP condition holds in real deployment scenarios and how it impacts the massive MIMO system performance. In this paper, we analyze the

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Mikhailov, Gennady A., Natalya V. Tracheva, and Sergey A. Ukhinov. "A new kernel-projective statistical estimator in the Monte Carlo method." Russian Journal of Numerical Analysis and Mathematical Modelling 35, no. 6 (2020): 341–53. http://dx.doi.org/10.1515/rnam-2020-0028.

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AbstractIn the present paper, we propose a new combined kernel-projective statistical estimator of the two-dimensional distribution density, where the first ‘main’ variable is processed with the kernel estimator, and the second one is processed with the projective estimator for the conditional distribution density. In this case, statistically estimated coefficients of some orthogonal expansion of the conditional distribution density are used for each ‘kernel’ interval defined by a micro-sample. The root-mean-square optimization of such an estimator is performed under the assumptions concerning

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Biscoveanu, Sylvia, Colm Talbot, and Salvatore Vitale. "The effect of spin mismodelling on gravitational-wave measurements of the binary neutron star mass distribution." Monthly Notices of the Royal Astronomical Society 511, no. 3 (2022): 4350–59. http://dx.doi.org/10.1093/mnras/stac347.

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Abstract The binary neutron star (BNS) mass distribution measured with gravitational-wave observations has the potential to reveal information about the dense matter equation of state, supernova physics, the expansion rate of the Universe, and tests of general relativity. As most current gravitational-wave analyses measuring the BNS mass distribution do not simultaneously fit the spin distribution, the implied population-level spin distribution is the same as the spin prior applied when analysing individual sources. In this work, we demonstrate that introducing a mismatch between the implied a

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