scholarly journals The challenge raised by Gaia

2009 ◽  
Vol 5 (H15) ◽  
pp. 174-175
Author(s):  
Annie C. Robin
Keyword(s):  
Data Analysis ◽  
Multivariate Data Analysis ◽  
Milky Way ◽  
Dynamical Evolution ◽  
High Quality ◽  
3D Kinematics ◽  
Galactic Potential ◽  
The Galaxy ◽  
High Level ◽  
Data Analysis Methods

AbstractGaia will perform an unprecedented high quality survey of the Milky Way. Distances, 3D kinematics, ages and abundances will be obtained, giving access to the overall mass distribution and to the Galactic potential. Gaia data analysis will involve a high level of complexity requiring new and efficient multivariate data analysis methods, improved modelling of the stellar populations and dynamical approaches to the interpretation of the data in terms of the chemical and dynamical evolution of the Galaxy.

scholarly journals Sparse STATIS-Dual via Elastic Net

Mathematics ◽  
2021 ◽  
Vol 9 (17) ◽  
pp. 2094
Author(s):  
Carmen C. Rodríguez-Martínez ◽  
Mitzi Cubilla-Montilla ◽  
Purificación Vicente-Galindo ◽  
Purificación Galindo-Villardón
Keyword(s):  
Data Analysis ◽  
Programming Language ◽  
Multivariate Data Analysis ◽  
Real Data ◽  
Elastic Net ◽  
R Programming Language ◽  
Data Tables ◽  
R Programming ◽  
Penalty Technique ◽  
Data Analysis Methods

Multi-set multivariate data analysis methods provide a way to analyze a series of tables together. In particular, the STATIS-dual method is applied in data tables where individuals can vary from one table to another, but the variables that are analyzed remain fixed. However, when you have a large number of variables or indicators, interpretation through traditional multiple-set methods is complex. For this reason, in this paper, a new methodology is proposed, which we have called Sparse STATIS-dual. This implements the elastic net penalty technique which seeks to retain the most important variables of the model and obtain more precise and interpretable results. As a complement to the new methodology and to materialize its application to data tables with fixed variables, a package is created in the R programming language, under the name Sparse STATIS-dual. Finally, an application to real data is presented and a comparison of results is made between the STATIS-dual and the Sparse STATIS-dual. The proposed method improves the informative capacity of the data and offers more easily interpretable solutions.

Dynamical evolution of globular clusters: Recent developments

2017 ◽  
Vol 26 (09) ◽  
pp. 1730017
Author(s):  
Marco Merafina
Keyword(s):  
Globular Cluster ◽  
Globular Clusters ◽  
Milky Way ◽  
Structural Parameters ◽  
Dynamical Evolution ◽  
Limit Value ◽  
Tidal Forces ◽  
The Galaxy ◽  
Recent Developments ◽  
Theoretical Results

We analyze structural parameters of the globular clusters belonging to the Milky Way system which were listed in the latest edition of the Harris Catalogue. We search for observational evidences of the effect of tidal forces induced by the Galaxy on the dynamical and thermodynamical evolution of a globular cluster. The behavior for the [Formula: see text] distribution exhibited by the globular cluster population seems to be in contrast with theoretical results in literature about gravothermal instability, and suggest a new limit value smaller than the previous one.

scholarly journals The orbital evolution of UFDs and GCs in an evolving Galactic potential

2020 ◽  
Vol 500 (3) ◽  
pp. 2937-2957
Author(s):  
Benjamin M Armstrong ◽  
Kenji Bekki ◽  
Aaron D Ludlow
Keyword(s):  
Globular Clusters ◽  
Milky Way ◽  
Orbital Evolution ◽  
Orbital Parameters ◽  
Angular Momenta ◽  
Galactic Potential ◽  
The Galaxy ◽  
Galaxy Masses ◽  
The Difference ◽  
Evolving Models

ABSTRACT We use the second Gaia data release to investigate the kinematics of 17 ultra-faint dwarf galaxies (UFDs) and 154 globular clusters (GCs) in the Milky Way, focusing on the differences between static and evolving models of the Galactic potential. An evolving potential modifies a satellite’s orbit relative to its static equivalent, though the difference is small compared to existing uncertainties on orbital parameters. We find that the UFD Boötes II is likely on its first passage around the Milky Way. Depending on the assumed mass of the Milky Way, the UFDs Triangulum II, Hydrus I, Coma Berenices, Draco II, and Ursa Major II, as well as the GC Pyxis, may also be on first infall so may be useful for constraining the mass of the Galaxy. We identify a clear kinematic distinction between metal-rich ([Fe/H] > −1.1) and metal-poor GCs ([Fe/H] ≤ −1.1). Although most metal-rich clusters occupy predominately prograde orbits, with low eccentricities (e ≈ 0.35) and similar specific angular momenta and orbital planes as the Galactic disc, seven show potentially retrograde orbits, the origin of which is unclear. Metal-poor clusters have more diverse orbits, higher eccentricities (e ≈ 0.65), and half of them have orbital planes offset from the disc by 60° to 120°—twice as many as the metal-poor GCs. The UFDs have similar θ and ϕ to the metal-poor GCs, suggesting a similar origin. We provide a catalogue of orbital parameters for UFDs and GCs for two different Galaxy masses and their observational uncertainties.

Determination of the Phenol and Tocopherol Content in Italian High-Quality Extra-Virgin Olive Oils by Using LC-MS and Multivariate Data Analysis

2020 ◽  
Vol 13 (5) ◽  
pp. 1027-1041 ◽  
Author(s):  
Laura Dugo ◽  
Marina Russo ◽  
Francesco Cacciola ◽  
Filippo Mandolfino ◽  
Fabio Salafia ◽  
...  
Keyword(s):  
Data Analysis ◽  
Multivariate Data Analysis ◽  
Multivariate Data ◽  
Tocopherol Content ◽  
High Quality ◽  
Virgin Olive Oils ◽  
Olive Oils

scholarly journals Konsep Penanganan Sanitasi Permukiman Kumuh di Kecamatan Lowokwaru, Kota Malang

2020 ◽  
Vol 22 (1) ◽  
pp. 83-93
Author(s):  
Hasan Hasan ◽  
Ibnu Sasongko ◽  
Titik Poerwati
Keyword(s):  
Waste Water ◽  
Data Analysis ◽  
Solid Waste ◽  
Scoring Methods ◽  
The Government ◽  
High Level ◽  
Cluster Methods ◽  
Sanitation Infrastructure ◽  
Collection Methods ◽  
Data Analysis Methods

Sanitasi merupakan salah satu kriteria permasalahan permukiman kumuh di Kota Malang yang meliputi masalah persampahan, air limbah, dan drainase. Masalah tersebut tersebar di 5 Kecamatan di Kota Malang salah satunya adalah Kecamatan Lowokwaru. Berbagai penanganan telah dilakukan baik dari pemerintah maupun masyarakat untuk mengatasi masalah sanitasi di Kecamatan Lowokwaru diantaranya adalah penanganan sanitasi di RW 3 & RW 6 Kelurahan Dinoyo, RW 5 dan RW 7 Kelurahan Tlogomas, dan RW 9 Kelurahan Jatimulyo. Oleh karena itu, penelitian ini bertujuan untuk mengetahui konsep penanganan sanitasi di lokasi tersebut. Metode pengumpulan data yang digunakan dalam penelitian ini adalah observasi, wawancara, dan kuesioner. Metode analisa data yang digunakan adalah metode statistik deskriptif, metode skoring, dan metode klaster. Berdasarkan hasil analisa, ketersediaan prasarana sanitasi di lokasi penelitian masih kurang untuk prasarana persampahan yakni tempat sampah, sedangkan untuk prasarana limbah dan drainase sudah mencukupi. Untuk tingkat permasalahan, hanya RW 3 Kelurahan Dinoyo dan RW 7 Kelurahan Tlogomas yang berada pada level tinggi (baik), sedangkan RW 5 Kelurahan Tlogomas dan RW 9 Kelurahan Jatimulyo berada pada level rendah (buruk). Untuk konsep penanganan, terdapat 3 macam konsep yang diterapkan di lokasi penelitian yaitu percontohan, partisipatori, dan bantuan. Kesimpulan dalam penelitian ini adalah ketersediaan prasarana persampahan di lokasi penelitian masih kurang dan tidak adanya hubungan antara konsep penanganan sanitasi yang telah diterapkan dengan tingkat permasalahan sanitasi. Sanitation is one of the criteria of slum settlement problems in Malang City, covering the problem of solid waste, waste water, and drainage. The problem is spread in 5 sub-districts in Malang City, one of which is Lowokwaru Sub-district. Various handling has been done both from the government and society to solve sanitation problems in Lowokwaru Sub-district, including sanitation handling in RW 3 & RW 6 Dinoyo, RW 5 and RW 7 Tlogomas, and RW 9 Jatimulyo. Therefore, this study aims to find out the concept of sanitation handling in these locations. Data collection methods used in this study are observation, interviews, and questionnaires. Data analysis methods used are descriptive statistical methods, scoring methods, and cluster methods. Based on the results of the analysis, the availability of sanitation infrastructure at the research site is still lacking for solid waste infrastructure, namely the trash, while for waste and drainage infrastructure is sufficient. For the level of problem, only RW 3 Dinoyo and RW 7 Tlogomas are at a high level (good), while RW 5 Tlogomas and RW 9 Jatimulyo are at a low level. For the concept of handling, there are 3 types of concepts that are applied in the research location are pilot, participatory, and assistance. The conclusion in this study is the availability of solid waste infrastructure in the research location is still lacking and there is no relationship between the concept of sanitation handling that has been applied to the level of sanitation problems. Keywords : availability, consept of handling, level of problem, sanitation

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