scholarly journals SU2-NEMO: An Open-Source Framework for High-Mach Nonequilibrium Multi-Species Flows

Aerospace ◽  
2021 ◽  
Vol 8 (7) ◽  
pp. 193
Author(s):  
Walter T. Maier ◽  
Jacob T. Needels ◽  
Catarina Garbacz ◽  
Fábio Morgado ◽  
Juan J. Alonso ◽  
...  
Keyword(s):  
Open Source ◽  
Physical Models ◽  
Three Dimensions ◽  
Chemical Library ◽  
Efficient Manner ◽  
High Enthalpy ◽  
Discretization Schemes ◽  
Numerical Formulation ◽  
High Mach ◽  
Convective Fluxes

SU2-NEMO, a recent extension of the open-source SU2 multiphysics suite’s set of physical models and code architecture, is presented with the aim of introducing its enhanced capabilities in addressing high-enthalpy and high-Mach number flows. This paper discusses the thermal nonequilibrium and finite-rate chemistry models adopted, including a link to the Mutation++ physio-chemical library. Further, the paper discusses how the software architecture has been designed to ensure modularity, incorporating the ability to introduce additional models in an efficient manner. A review of the numerical formulation and the discretization schemes utilized for the convective fluxes is also presented. Several test cases in two- and three-dimensions are examined for validation purposes and to illustrate the performance of the solver in addressing complex nonequilibrium flows.

scholarly journals Jupyter: Thinking and Storytelling with Code and Data

2021 ◽  
Author(s):  
Brian Granger ◽  
Fernando Pérez
Keyword(s):  
Machine Learning ◽  
Open Source ◽  
Community Of Practice ◽  
Scientific Computing ◽  
Data Science ◽  
Climate Science ◽  
Three Dimensions ◽  
Open Source Project ◽  
Interactive Computing ◽  
The Impact

Project Jupyter is an open-source project for interactive computing widely used in data science, machine learning, and scientific computing. We argue that even though Jupyter helps users perform complex, technical work, Jupyter itself solves problems that are fundamentally human in nature. Namely, Jupyter helps humans to think and tell stories with code and data. We illustrate this by describing three dimensions of Jupyter: interactive computing, computational narratives, and  the idea that Jupyter is more than software. We illustrate the impact of these dimensions on a community of practice in Earth and climate science.

Model to Estimate the Human Factor Quality in FLOSS Development

2015 ◽  
pp. 219-236
Author(s):  
Zulaima Chiquin ◽  
Kenyer Domínguez ◽  
Luis E. Mendoza ◽  
Edumilis Méndez
Keyword(s):  
Decision Making ◽  
Human Resources ◽  
Open Source ◽  
Open Source Software ◽  
Human Factor ◽  
Three Dimensions ◽  
Decision Making Process ◽  
Self Evaluation ◽  
Systemic Quality

This chapter presents a Model to Estimate the Human Factor Quality in Free/Libre Open Source Software (FLOSS) Development, or EHFQ-FLOSS. The model consists of three dimensions: Levels (individual, community, and foundation), Aspects (internal or contextual), and Forms of Evaluation (self-evaluation, co-evaluation, and hetero-evaluation). Furthermore, this model provides 145 metrics applicable to all three levels, as well as an algorithm that guides their proper application to estimate the systemic quality of human resources involved in the development of FLOSS, guide the decision-making process, and take possible corrective actions.

ROBIN: An open-source middleware for plug‘n’produce of Cyber-Physical Systems

2020 ◽  
Vol 17 (3) ◽  
pp. 172988142091031
Author(s):  
Rafael Arrais ◽  
Paulo Ribeiro ◽  
Henrique Domingos ◽  
Germano Veiga
Keyword(s):  
Open Source ◽  
Industrial Revolution ◽  
Cyber Physical Systems ◽  
Industrial Applications ◽  
Mobile Manipulator ◽  
Battery Management ◽  
Efficient Manner ◽  
Physical Systems ◽  
Data Interchange ◽  
Automation Equipment

Motivated by the Fourth Industrial Revolution, there is an ever-increasing need to integrated Cyber-Physical Systems in industrial production environments. To address the demand for flexible robotics in contemporary industrial environments and the necessity to integrate robots and automation equipment in an efficient manner, an effective, bidirectional, reliable and structured data interchange mechanism is required. As an answer to these requirements, this article presents ROBIN, an open-source middleware for achieving interoperability between the Robot Operating System and CODESYS, a softPLC that can run on embedded devices and that supports a variety of fieldbuses and industrial network protocols. The referred middleware was successfully applied and tested in various industrial applications such as battery management systems, motion, robotic manipulator and safety hardware control, and horizontal integration between a mobile manipulator and a conveyor system.

Assessing the Health of an Open Source Ecosystem

2007 ◽  
pp. 238-258 ◽  
Author(s):  
Donald Wynn Jr.
Keyword(s):  
Conceptual Framework ◽  
Open Source ◽  
Open Source Software ◽  
Ecosystem Health ◽  
Three Dimensions ◽  
Software Projects

This study examines the concept of an ecosystem as originated in the field of ecology and applied to open source software projects. Additionally, a framework for assessing the three dimensions of ecosystem health is defined and explained using examples from a specific open source ecosystem. The conceptual framework is explained in the context of a case study for a sponsored open source ecosystem. The framework and case study highlight a number of characteristics and aspects of these ecosystems which can be evaluated by existing and potential members to gauge the health and sustainability of open source projects and the products and services they produce.

Role of reciprocity in firms' open source strategies

2020 ◽  
Vol 15 (5) ◽  
pp. 797-815 ◽  
Author(s):  
Yiqing Yu
Keyword(s):  
Financial Performance ◽  
Open Source ◽  
Social Participation ◽  
Structural Equation ◽  
Three Dimensions ◽  
Equation Modeling ◽  
Symbiotic Relationship ◽  
Behavioral Strategies ◽  
Content Type ◽  
Open Source Communities

PurposeInterorganizational reciprocity plays a key role in relationships among software firms and open source communities. This study seeks to illuminate how a firm's open source strategy, characterized by its participation in the open source community, contributes to its financial performance.Design/methodology/approachBased on the norm of reciprocity and social capital theory, the study proposes a model comprising the behavioral antecedents and business results of a firm's symbiotic relationship with the open source community. Data were collected through a survey. Partial least squares-based structural equation modeling (PLS-SEM) was used to assess the results.FindingsA firm's participative behaviors can have three dimensions: technology giving, technology taking and social participation. Technology taking directly impacts financial performance, whereas the effects of technology giving and social participation on financial performance are fully mediated by the firm's symbiotic relationship with the open source community.Practical implicationsManagers can understand how a specific behavior ultimately contributes to a symbiotic relationship or a firm's financial performance and how to flexibly align participation strategies with the business orientation.Originality/valueThe study adds to the open source literature by refining and enriching the conceptual domain of a firm's participative behaviors in open source communities. It also reveals how contrasting behavioral strategies impact a firm's financial performance.

DRAWxtl, an open-source computer program to produce crystal structure drawings

2007 ◽  
Vol 40 (1) ◽  
pp. 188-192 ◽  
Author(s):  
Larry W. Finger ◽  
Martin Kroeker ◽  
Brian H. Toby
Keyword(s):  
Crystal Structure ◽  
Computer Program ◽  
Open Source ◽  
Composite Structures ◽  
Magnetic Moments ◽  
Lone Pair ◽  
Three Dimensions ◽  
Web Pages ◽  
Source Program ◽  
Lone Pair Electrons

The computer programDRAWxtlproduces crystal structure drawings in the form of an interactive screen representation, as well as VRML files for use on web pages and in classroom teaching, and creates input files for the popularPersistence of Vision Raytracer(POV-Ray) rendering program for publication-quality graphics, including generation of stereo pairs.DRAWxtloutput produces the standard kinds of graphical representations: spheres, ellipsoids, bonds and polyhedra of any complexity. In addition, it can draw arrows to represent magnetic moments, show capped cones to indicate the location of lone-pair electrons and display Fourier contours in three dimensions. A unique feature of this program is the ability to plot incommensurately modulated and composite structures. This open-source program can be used with operating systems as diverse as Windows (9X, NT, 2000 and XP), Mac OS X, Linux and most other varieties of Unix.

scholarly journals IMPROVEMENT OF DEM GENERATION FROM ASTER IMAGES USING SATELLITE JITTER ESTIMATION AND OPEN SOURCE IMPLEMENTATION

2015 ◽  
Vol XL-1-W5 ◽  
pp. 249-253 ◽  
Author(s):  
L. Girod ◽  
C. Nuth ◽  
A. Kääb
Keyword(s):  
Open Source ◽  
Thermal Emission ◽  
Ground Truth ◽  
Three Dimensions ◽  
Glacier Mass Balance ◽  
Mountain Glacier ◽  
Ground Control Points ◽  
Rational Polynomial ◽  
Cross Track

The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) system embarked on the Terra (EOS AM-1) satellite has been a source of stereoscopic images covering the whole globe at a 15m resolution at a consistent quality for over 15 years. The potential of this data in terms of geomorphological analysis and change detection in three dimensions is unrivaled and needs to be exploited. However, the quality of the DEMs and ortho-images currently delivered by NASA (ASTER DMO products) is often of insufficient quality for a number of applications such as mountain glacier mass balance. For this study, the use of Ground Control Points (GCPs) or of other ground truth was rejected due to the global “big data” type of processing that we hope to perform on the ASTER archive. We have therefore developed a tool to compute Rational Polynomial Coefficient (RPC) models from the ASTER metadata and a method improving the quality of the matching by identifying and correcting jitter induced cross-track parallax errors. Our method outputs more accurate DEMs with less unmatched areas and reduced overall noise. The algorithms were implemented in the open source photogrammetric library and software suite MicMac.

scholarly journals pdb-tools: a swiss army knife for molecular structures

2018 ◽  
Author(s):  
João P.G.L.M. Rodrigues ◽  
João M.C. Teixeira ◽  
Mikaël Trellet ◽  
Alexandre M.J.J. Bonvin
Keyword(s):  
Molecular Structure ◽  
Open Source ◽  
Structure Data ◽  
Molecular Structures ◽  
Command Line ◽  
Efficient Manner

The pdb-tools are a collection of Python scripts for working with molecular structure data in the PDB format. They allow users to edit, convert, and validate PDB files, from the command-line, in a simple but efficient manner. The pdb-tools are implemented in Python, without any external dependencies, and are freely available under the open-source Apache License at https://github.com/haddocking/pdb-tools/ and on PyPI (https://pypi.org/project/pdb-tools/).

GENERATING ISOTROPIC DISCRETE WAVES ON CELLULAR AUTOMATA

2001 ◽  
Vol 15 (07) ◽  
pp. 1007-1021
Author(s):  
FABIEN FESCHET ◽  
LAURE TOUGNE
Keyword(s):  
Cellular Automata ◽  
Discrete Time ◽  
Three Dimensions ◽  
Massively Parallel ◽  
Computation Model ◽  
Discretization Schemes ◽  
Physical Simulations ◽  
Local Characterization ◽  
The Relationship

Cellular automata are a massively parallel computation model with discrete time and local rules. They are well adapted to biological or physical simulations. However, they are intrinsically anisotropic. The possibility of computing isotropic figures on cellular automata such as circles has already been proved.4 Moreover, the previous construction enables to compute all the major discretizations known in the literature. We present in this article an extension of this work to the construction of spheres in three dimensions. A local characterization of a sphere is presented based upon the relationship between spheres and circles. This leads to the possibility of constructing a family of concentric discrete spheres in real time. Moreover, the approach can use many discretization schemes leading to the construction of various discrete spheres as done for circles.

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