ASC/NGC Gitlab Tutorial
This document summarizes version control systems and the source code it manages.
96 KNOWLEDGE MANAGEMENT AND PRESERVATION↗
SEARCH · Engineering Papers
Results for “Tutorial”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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A Pulsed Sphere Tutorial
Here I attempt to explain what physically happens when we pulse an object with neutrons, specifically what we expect the time dependent behavior of the neutron population to look like. Emphasis is on the time dependent emission of both prompt and delayed neutrons. I also describe how the TART Monte Carlo transport code models this situation; see the appendix for a complete description of the model used by TART. I will also show that, as we expect, MCNP and MERCURY, produce similar results using the same delayed neutron model (again, see the appendix).
73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗
An MPI Tutorial: Collectives and Point-to-Point Communication
This document is a lecture for the Parallel Computing Summer Research Internship at LANL. It describes the Message Passing Interface and its application.
97 MATHEMATICS AND COMPUTING↗
An MPI Tutorial: Data Types and Threading
This report describes data types and threading. It was presented at the 2017 LANL Parallel Computer summer school.
97 MATHEMATICS AND COMPUTING↗
Online orbit fit at RHIC - A tutorial
The OnlineOrbitFit algorithm is based on the concept (unpublished) by Paul Emma (SLAC) which was re-derived and encoded into RhicOrbitDisplay by Chuyu Liu. The algorithm has numerous applications including localization of errors in the beam trajectory or in the beam optics model. Examples are given in this report.
43 PARTICLE ACCELERATORS↗
HIV Databases video tutorial on use of the HIV sequence quality control tool
The HIV Databases at LANL (https://www.hiv.lanl.gov) provide many tools for HIV data retrieval and analysis. The quality control tool (https://www.hiv.lanl.gov/content/sequence/QC/index.html) is used to check the quality of new HIV sequence data, help the user determine which subtype of virus belongs to, and prepare the data for submission to the database. This video gives a 10 minute overview of the use of the tool and illustrates results form a sample data set.
59 BASIC BIOLOGICAL SCIENCES↗
Tutorial Papers on Greenhouse Effect
The first paper [1], dealing with Earth’s natural greenhouse effect, presents an overview of Earth’s radiation budget and of Earth’s climate system, followed by an examination of the role of the greenhouse effect in Earth’s climate. The second paper [2] introduces the concept of radiative forcing of climate change, examines increases in greenhouse (infrared absorbing) gases over the Anthropocene epoch and the resultant radiative forcings and describes climate system response to these forcings.
54 ENVIRONMENTAL SCIENCES↗
A short tutorial on uranium electropolishing
Electropolishing of uranium metal is best performed in a simple aqueous solution of phosphoric acid. With +3 to +10 volts of bias potential applied to the uranium (anode) relative to a Pt counter electrode (cathode). As summarized in a Pourbaix stability diagram, these conditions yield dissolution of the U surface as UOX containing solution species without the possibility of injecting hydrogen into the metal surface. However, if the uranium is biased to negative potentials relative to the counter electrode then water may be reduced at the U surface and hydrogen gas becomes available for reaction with the U metal. The stability diagram may be modified if there are other complexing species present in solution and the potential scale shifted if a different metal is use for the counter electrode. These effects can be understood in a known way as long as solution and electrochemical cell conditions are recognized.
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEA↗
Discrete Element Method Analysis for Metal Powders Used in Additive Manufacturing, and DEM Simulation Tutorial Using LIGGGHTS-PUBLIC [PowerPoint and paper]
Discrete Element Method (DEM) is a method of analysis to evaluate the dynamic interactions between granular particles. This method has been used in the pharmaceutical industry to improve the powder compaction process for tablet manufacturing. There are also applications in agriculture, food industry, and manufacturing. Direct energy deposition is an additive manufacturing technique which uses metallic powders fed through a nozzle, melted using a directed laser, and transformed into a solid object layer by layer. One way of feeding metal particles into the system involves the use of a vibrating hopper. Given a specified amplitude and frequency input, the hopper will enable the powder to travel up a path, and inject through the system with assistance from a stream of gas. The mechanical properties of a printed object can vary, depending on the characteristics of the powder flow and the particles’ as-received properties. Improved understanding of dynamic interactions of flowing powders could enable additive manufacturing components with 2D or 3D variations in mechanical properties, e.g., density. This work uses DEM simulation software to investigate the effects of particle cohesion, friction, and density on the quality of the flow by performing an angle of repose simulation, which is often used as a metric to evaluate the flowability of powders.
36 MATERIALS SCIENCE↗
Pavilion Tutorial [PowerPoint]
An overview of the Pavilion HPC Test Harness software is provided.
97 MATHEMATICS AND COMPUTING↗
American Nuclear Society Winter Meeting – Chemistry Tutorial
What is a Process Engineer?; What is a typical uranium flow sheet (e.g. process flow diagram)?; Process Engineering Considerations; Common miscommunications; Common operational “upsets” (e.g. expected abnormal or off-normal events)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
Preparation of Nuclear Data Libraries for Web Release [Slides] and Tutorial for Generating Correlated Random Samples and Propagation of Uncertainty [Slides]
The first presentation discuses moving distribution of nuclear data to an online platform which allows ore frequent nuclear data updates, greater ease of acquiring nuclear data, and user flexibility in what nuclear data to download. The second presentation illustrates uncertainties without correlation, uncertainties without correlation with negative samples, uncertainties with correlation, uncertainties with a χ-like constraint, uncertainties with a Σ tot -like constraint, sampling using different distributions, and dealing with negative eigenvalues in a covariance matrix.
42 ENGINEERING↗
Nek5000: improvements in the available RANS models, meshing, tutorials, and training
This year, the Nuclear Energy Advanced Modeling Simulation program (NEAMS) thermal-hydraulics report for Nek5000 NRC- and verification and validation (V&V)-driven development focuses on following areas of code application and improvement. First we have continued improvements of RANS modeling capabilities in Nek5000 including improved k-tau model focusing mostly on wallfunction initial implementation with spectral element method (SEM) and initiating investigation of an alternative approach XSEM that greatly reduces discretization errors.
22 GENERAL STUDIES OF NUCLEAR REACTORS↗
Tutorial Guide: Biological Performance Assessment (BioPA) Toolset for High Head Passage
Higher head facilities that impede migratory fish use trap and transport to varying levels of success. There are ongoing efforts to improve the downstream passage. One such effort seeks to attract fish by using large flow, shedding most of the attraction flow, and routing fish downstream using minimal flows. To demonstrate BioPA is suitable for improving downstream high head fish passage, a similar type flow path will be used in this document.
54 ENVIRONMENTAL SCIENCES↗
Machine Learning Tutorial - Introduction to Machine Learning [Slides]
Abstract not provided.
97 MATHEMATICS AND COMPUTING↗
SCALE Sensitivity Tutorial [Slides]
In sensitivity analysis, we seek to quantify the degree to which fundamental data (i.e., nuclear data) influence a system’s response. In uncertainty analysis, we seek to quantify the degree to which uncertainty in fundamental data contributes to uncertainty in a system’s response. In SCALE, the TSUNAMI suite provides tools for sensitivity and uncertainty analysis, similarity analysis, and nuclear data and covariance adjustment.
73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗