Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Publication
- Publication Type
Articles 1 - 8 of 8
Full-Text Articles in Entire DC Network
Assessing Water Quality Modeling In Subtropical Regions Based On A Case Study Of The Aguamilpa Reservoir, Oliver Obregon
Assessing Water Quality Modeling In Subtropical Regions Based On A Case Study Of The Aguamilpa Reservoir, Oliver Obregon
Theses and Dissertations
The shortage of water in Mexico has made public and private institutions look at reservoirs as an alternative solution for present and future water supply. However, eighty percent of the existing reservoirs in Mexico are contaminated at some level, many severely. Water quality models are water-management tools used to diagnose water quality problems and the impact of various environmental conditions. They can be effective in assessing various measures of remediation leading to improved water quality. In most of the cases such water quality models have been successfully applied in reservoirs located in temperate climates. However, the use of water quality …
Multidimensional Modeling Of Solid Propellant Burning Rates And Aluminum Agglomeration And One-Dimensional Modeling Of Rdx/Gap And Ap/Htpb, Matthew Wilder Tanner
Multidimensional Modeling Of Solid Propellant Burning Rates And Aluminum Agglomeration And One-Dimensional Modeling Of Rdx/Gap And Ap/Htpb, Matthew Wilder Tanner
Theses and Dissertations
This document details original numerical studies performed by the author pertaining to solid propellant combustion. Detailed kinetic mechanisms have been utilized to model the combustion of the pseudo-propellants RDX/GAP and AP/HTPB. A particle packing model and a diffusion flame model have been utilized to develop a burning rate and an aluminum agglomeration model. The numerical model for RDX/GAP combustion utilizes a "universal" gas-phase kinetic mechanism previously applied to combustion models of several monopropellants and pseudo-propellants. The kinetic mechanism consists of 83 species and 530 reactions. Numerical results using this mechanism provide excellent agreement with RDX and GAP burning rate data, …
A Mechanistic Investigation Of Nitrogen Evolution In Pulverized Coal Oxy-Fuel Combustion, Andrew John Mackrory
A Mechanistic Investigation Of Nitrogen Evolution In Pulverized Coal Oxy-Fuel Combustion, Andrew John Mackrory
Theses and Dissertations
Oxy-fuel combustion is an enabling technology for capture of CO2 from coal combustion, the economics of which depends strongly on the ability of the process to produce low NOX emissions. The literature contains many reports of lower NOX emissions from oxy-fuel combustion but the reasons for this are not fully understood. The objective of this work was to gain understanding of nitrogen evolution under pulverized coal oxy-fuel conditions. Pulverized coal was burned in a once-through, down-fired, laminar flow reactor. Nitrogen compounds and other combustion species were measured at the reactor centerline as a function of distance from the burner. Dry …
Actor Modeling And Actor-Based Modeling: New Methods To Analyze The Human Component Of Human-Environment Systems, Petra Döll, Christiane Doll, Alexandra Titz
Actor Modeling And Actor-Based Modeling: New Methods To Analyze The Human Component Of Human-Environment Systems, Petra Döll, Christiane Doll, Alexandra Titz
International Congress on Environmental Modelling and Software
The future of natural resources depends on the actions of people. Thus, whenever assessing options for a sustainable management of natural resources, it may not good enough to provide decision makers with a decision support system that integrates the technical and natural system components only. To include the human system component, it is state-ofthe- art to — in addition to demographic modeling and economic optimization — consider human actions in storylines of qualitative scenarios, which are then translated ad-hoc into quantitative scenarios of input variables of models of the technical and natural systems components. We propose modeling of societal actors …
Application Of The Hspf Model For Flood Simulation With Analysis Of The Results In Terms Of Monitoring Uncertainties /Case Study Of The Lesnovska River, Bulgaria/, P. Ninov, I. Ribarova, P. Kalinkov, G. Dimova
Application Of The Hspf Model For Flood Simulation With Analysis Of The Results In Terms Of Monitoring Uncertainties /Case Study Of The Lesnovska River, Bulgaria/, P. Ninov, I. Ribarova, P. Kalinkov, G. Dimova
International Congress on Environmental Modelling and Software
Floods are amongst the most damaging natural disasters worldwide. The newEU Floods Directive and the implementation of the EU Adaptation Green Paper willrequire improving of the flood-related research. In this study, the HSPF model was appliedto simulate and analyze a very significant and unexpected flood occurred in 2005 along theLesnovska River, a right tributary of the Iskar mainstream in the western part of Bulgaria.The difference between the simulated and the measured flood volumes was found veryhigh and equal to 130% for the flood of 2005, while percent differences of 25-33% wereobserved for the seasonal, annual and low flow distribution. These …
Parametric Optimization Design System For A Fluid Domain Assembly, Matthew Jackson Fisher
Parametric Optimization Design System For A Fluid Domain Assembly, Matthew Jackson Fisher
Theses and Dissertations
Automated solid modeling, integrated with computational fluid dynamics (CFD) and optimization of a 3D jet turbine engine has never been accomplished. This is due mainly to the computational power required, and the lack of associative parametric modeling tools and techniques necessary to adjust and optimize the design. As an example, the fluid domain of a simple household fan with three blades may contain 500,000 elements per blade passage. Therefore, a complete turbine engine that includes many stages, with sets of thirty or more blades each, will have hundreds of millions of elements. The fluid domains associated with each blade creates …
Parallel Processing Of Reactive Transport Models Using Openmp, Jared D. Mclaughlin
Parallel Processing Of Reactive Transport Models Using Openmp, Jared D. Mclaughlin
Theses and Dissertations
Transport codes are beginning to be parallelized in order to allow more complex add-ons, such as geochemical packages, to utilize finer, more accurate grids, and to reduce solution times making stochastic and Monte Carlo simulations more feasible. Most codes parallelized via MPI (message passing interface) offer good results, but require the development of a new parallel code. OpenMP, the shared-memory standard, offers incremental parallelization, allowing sequential codes to remain relatively intact with minimal changes or additions. OpenMP allows speedup to be seen on personal computers with dual processors or greater, unlike some other parallelization approaches that require a supercomputer. An …
A Model For Predicting The Piezoresistive Effect In Microflexures Experiencing Bending And Tension Loads, Gary K. Johns, Larry L. Howell, Brian D. Jensen, Timothy W. Mclain
A Model For Predicting The Piezoresistive Effect In Microflexures Experiencing Bending And Tension Loads, Gary K. Johns, Larry L. Howell, Brian D. Jensen, Timothy W. Mclain
Faculty Publications
This paper proposes a model for predicting the piezoresistive effect in microflexures experiencing bending stresses. Linear models have long existed for describing piezoresistivity for members in pure tension and compression. However, extensions of linear models to more complex loading conditions do not match with experimental results. A second-order model to predict piezoresistive effects in tension, compression, and more complex loading conditions is proposed. A reduced form of the general second-order model is presented for thin flexures in bending. A three-step approach is used to determine the piezoresistive coefficients for this reduced-form model. The approach is demonstrated for two sets of …