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Modelo Aproximado Del Coeficiente De Dispersión En Medios Porosos, Francisco J. Valdes-Parada, Helen D, Lugo-Méndez, J. Alberto Ochoa-Tapia 2010 Universidad Autonoma Metropolitana - Iztapalapa

Modelo Aproximado Del Coeficiente De Dispersión En Medios Porosos, Francisco J. Valdes-Parada, Helen D, Lugo-Méndez, J. Alberto Ochoa-Tapia

Francisco J. Valdes-Parada

En este trabajo, se utiliza el método del promedio volumétrico para la predicción del coeficiente efectivo de dispersión y la teoría de las funciones de Green para encontrar una solución analítica aproximada. Como simplificación de la celda representativa del medio poroso homogéneo, se usó la celda de Chang, imponiendo la condición de flujo reptante. Para corroborar los resultados se determinó numéricamente el coeficiente efectivo, en celdas unitarias periódicas usando el programa comercial basado en el método de de elemento finito COMSOL Multiphysics. El coeficiente efectivo de dispersión analítico obtenido en este trabajo presenta una tendencia análoga al numérico, además de ...


A Reactive Molecular Dynamics Simulation Of The Silica-Water Interface, Joseph C. Fogarty, Hasan Metin Aktulga, Ananth Y. Grama, Adri C. T. Van Duin, Sagar A. Pandit 2010 University of South Florida

A Reactive Molecular Dynamics Simulation Of The Silica-Water Interface, Joseph C. Fogarty, Hasan Metin Aktulga, Ananth Y. Grama, Adri C. T. Van Duin, Sagar A. Pandit

PRISM: NNSA Center for Prediction of Reliability, Integrity and Survivability of Microsystems

We report our study of a silica-water interface using reactive molecular dynamics. This first-of-its-kind simulation achieves length and time scales required to investigate the detailed chemistry of the system. Our molecular dynamics approach is based on the ReaxFF force field of van Duin [J. Phys. Chem. A 107, 3803 (2003)]. The specific ReaxFF implementation (SERIALREAX) and force fields are first validated on structural properties of pure silica and water systems. Chemical reactions between reactive water and dangling bonds on a freshly cut silica surface are analyzed by studying changing chemical composition at the interface. In our simulations, reactions involving silanol ...


Diseño De Una Parrilla Para La Reducción De Pérdidas De Energía En Estufas Convencionales, Francisco J. Valdes-Parada, Victor Castillo-Jimenez, Alberto Gabino-Zamora, Armando Astudillo-Velázquez 2010 Universidad Autonoma Metropolitana - Iztapalapa

Diseño De Una Parrilla Para La Reducción De Pérdidas De Energía En Estufas Convencionales, Francisco J. Valdes-Parada, Victor Castillo-Jimenez, Alberto Gabino-Zamora, Armando Astudillo-Velázquez

Francisco J. Valdes-Parada

Las estufas de gas convencionales tienen, por lo general, pérdidas considerables de energía alrededor del quemador, lo que disminuye su eficiencia e incrementa el consumo de recursos. Para atender este problema, en este trabajo se propone concentrar la mayor parte del calor hacia una sola región, para poder obtener la mayor cantidad de energía sin tener que suministrar más combustible y de esta manera aumentar la eficiencia de estufas convencionales. Para ello, se construyó un prototipo experimental a partir de cálculos de diseño teóricos. Con el prototipo ahorrador de energía se consiguió un ahorro hasta del 40% del consumo de ...


Análisis De La Transferencia De Calor En Azoteas Verdes, Francisco J. Valdes-Parada, Verónica Freyre-Fonseca 2010 Universidad Autonoma Metropolitana - Iztapalapa

Análisis De La Transferencia De Calor En Azoteas Verdes, Francisco J. Valdes-Parada, Verónica Freyre-Fonseca

Francisco J. Valdes-Parada

El problema de las islas urbanas de calor contribuye a los drásticos cambios climáticos que se sufren en ciudades densamente pobladas. Para atender este problema se tienen diversas alternativas, entre las cuales se contempla incorporar zonas verdes (e.g., paredes y azoteas verdes) en edificaciones que contrarresten los efectos de calentamiento excesivo. En este trabajo se estudia la transferencia de calor en edificaciones típicas de la ciudad de México utilizando diferentes configuraciones de zonas verdes. Los resultados muestran que el utilizar azoteas verdes tiene un efecto estabilizador en los perfiles locales de temperatura; sin embargo a nivel de toda una ...


Software Defined Gps Receiver, Isaac Renninger, Nathan Clem 2010 Indiana University - Purdue University Fort Wayne

Software Defined Gps Receiver, Isaac Renninger, Nathan Clem

Engineering Senior Design Projects

No abstract provided.


Mug Froster, Curtis Hollabaugh, Tha Maung, Matt Streicher, Grant Wegenka 2010 Indiana University - Purdue University Fort Wayne

Mug Froster, Curtis Hollabaugh, Tha Maung, Matt Streicher, Grant Wegenka

Engineering Senior Design Projects

No abstract provided.


Probabilistic Matching Pursuit For Compressive Sensing, Atul Divekar, Okan K. Ersoy 2010 Purdue University - Main Campus

Probabilistic Matching Pursuit For Compressive Sensing, Atul Divekar, Okan K. Ersoy

Department of Electrical and Computer Engineering Technical Reports

Compressive sensing investigates the recovery of a signal that can be sparsely represented in an orthonormal basis or overcomplete dictionary given a small number of linear combinations of the signal. We present a novel matching pursuit algorithm that uses the measurements to probabilistically select a subset of bases that is likely to contain the true bases constituting the signal. The algorithm is successful in recovering the original signal in cases where deterministic matching pursuit algorithms fail. We also show that exact recovery is possible when the number of nonzero coefficients is upto one less than the number of measurements. This ...


Contact Angle Hysteresis: A Different View And A Trivial Recipe For Low Hysteresis Hydrophobic Surfaces, Joseph W. Krumpfer, Thomas J. McCarthy 2010 University of Massachusetts - Amherst

Contact Angle Hysteresis: A Different View And A Trivial Recipe For Low Hysteresis Hydrophobic Surfaces, Joseph W. Krumpfer, Thomas J. Mccarthy

Thomas J. McCarthy

Contact angle hysteresis is addressed from two perspectives. The first is an analysis of the events that occur during motion of droplets on superhydrophobic surfaces. Hysteresis is discussed in terms of receding contact line pinning and the tensile failure of capillary bridges. The sign of the curvature of the solid surface is implicated as playing a key role. The second is the report of a new method to prepare smooth low hysteresis surfaces. The thermal treatment of oxygen plasma-cleaned silicon wafers with trimethylsilyl-terminated linear poly(dimethylsiloxane) (PDMS - commercial silicone oils) in disposable glass vessels is described. This treatment renders silicon ...


Escalamiento De Ecuaciones De Transporte De Energía En Un Tanque Agitado, Francisco J. Valdes-Parada, J. Alberto Ochoa-Tapia 2010 Universidad Autonoma Metropolitana - Iztapalapa

Escalamiento De Ecuaciones De Transporte De Energía En Un Tanque Agitado, Francisco J. Valdes-Parada, J. Alberto Ochoa-Tapia

Francisco J. Valdes-Parada

El planteamiento de balances para el diseño de equipos de transporte y reacción en Ingeniería Química suele llevarse a cabo mediante la aplicación de balances de coraza macroscópicos. Esta forma de proceder tiene la desventaja que no proporciona las restricciones y suposiciones que sustentan al modelo resultante, lo cual puede tener consecuencias graves en actividades de diseño y control de procesos. Una alternativa a esta metodología consiste en llevar a cabo un proceso de escalamiento de las ecuaciones de transporte válidas en la microescala, identificando sistemáticamente las suposiciones necesarias para la deducción del modelo macroscópico. En este trabajo se analiza ...


Simulation Of A Tubular Solid Oxide Fuel Cell Stack Operating On Biomass Syngas Using Aspen Plus, Wayne Doherty, Anthony Reynolds, David Kennedy 2010 Dublin Institute of Technology

Simulation Of A Tubular Solid Oxide Fuel Cell Stack Operating On Biomass Syngas Using Aspen Plus, Wayne Doherty, Anthony Reynolds, David Kennedy

Articles

A tubular solid oxide fuel cell (SOFC) stack was modelled and its operation on biomass syn-gas was investigated. The objective of this work was to develop a computer simulation model of a biomass gasification-SOFC (BG-SOFC) system capable of predicting performance under various operating conditions and using diverse fuels. The stack was modelled using Aspen Plus and considers ohmic, activation and concentration losses. It was validated against published data for operation on natural gas. Operating parameters such as fuel and air utilisation factor Uf and Ua, current density j and steam to carbon ratio STCR were varied and found ...


Evaluating The Appropriateness Of Project Delivery Systems For Different Trenchless Methods, Ali Mostafavi, Tom Iseley, Dulcy Abraham 2010 Purdue University

Evaluating The Appropriateness Of Project Delivery Systems For Different Trenchless Methods, Ali Mostafavi, Tom Iseley, Dulcy Abraham

Infrastructure System-of-Systems (I-SoS ) Research Group

Trenchless methods have been considered to be a viable solution for pipeline projects in urban areas. Their applicability in pipeline projects is expected to increase with the rapid advancements in technology and emerging concerns regarding social costs related to trenching methods. Selecting appropriate project delivery system (PDS) is a key to the success of trenchless projects. To ensure success of the project, the selected project delivery should be tailored to trenchless project specific characteristics and owner needs, since the effectiveness of project delivery systems differs based on different project characteristics and owners requirements. Since different trenchless methods have specific characteristics ...


Modelado De Un Reactor Solar Para El Cracking De Metano, Francisco J. Valdes-Parada, Hernando Romero-Paredes 2010 Universidad Autonoma Metropolitana - Iztapalapa

Modelado De Un Reactor Solar Para El Cracking De Metano, Francisco J. Valdes-Parada, Hernando Romero-Paredes

Francisco J. Valdes-Parada

En este trabajo se realiza el modelado de un reactor solar tubular con una capacidad de hasta 15 kW para la disociación térmica del metano. El reactor está compuesto por un tubo de grafito inmerso en una cavidad también de grafito que juega el papel de receptor del flujo solar concentrado. El objetivo de este trabajo es evaluar los perfiles de velocidad, de concentración y temperatura a lo largo del reactor en función de la concentración y el flujo de gas a la entrada del reactor. Con lo cual ha sido posible evidenciar algunos fenómenos poco discutidos durante la experimentación ...


A Novel Approach In Determining Points Of Interactive Transportations In The Firm, Zeinab Barati, Hannaneh Rashidi-Bajgan, Elham Esmaili 2010 Mazandaran University of Science and Technology, Department of Industrial Engineering

A Novel Approach In Determining Points Of Interactive Transportations In The Firm, Zeinab Barati, Hannaneh Rashidi-Bajgan, Elham Esmaili

Hannaneh Rashidi-Bajgan

Partitioning is the most vital element in designing of a firm layout. Today modern working environments are intended to more use of less space which could increase more interactions between related departments. Although progress communications network has reduced the need for physical transportation but the tangible connections between different parts of a firm seems essential still. The firm is willing to reduce transfers to the minimum possible in order to prevent the vain crowd and time stuck. The purpose of this paper is to use a new approach of decision making in the location and layout of firm’s partitions ...


A Madm Method For Office˗ Job Assignment Problem, Elham Esmaili, Hannaneh Rashidi-Bajgan, Zeinab Barati 2010 Mazandaran University of Science and Technology, Department of Industrial Engineering

A Madm Method For Office˗ Job Assignment Problem, Elham Esmaili, Hannaneh Rashidi-Bajgan, Zeinab Barati

Hannaneh Rashidi-Bajgan

There are different kinds of jobs in any organization; some of them have more traffic to one another, in the other words there are communicative rates between these office jobs. In this paper we want to develop an approach of analytical hierarchy process (ANP) so that enable us in assigning jobs to suitable office rooms. We suppose that we know distances between places and could predict the amount of flow movements between theses jobs and would like to minimize the distance×flow.


The Design And Validation Of A Novel Computational Simulation Of The Leg For The Investigation Of Injury, Disease, And Surgical Treatment, Joseph Iaquinto 2010 Virginia Commonwealth University

The Design And Validation Of A Novel Computational Simulation Of The Leg For The Investigation Of Injury, Disease, And Surgical Treatment, Joseph Iaquinto

Theses and Dissertations

Computational modeling of joints and their function, a developing field, is becoming a significant health and wellness tool of our modern age. Due to familiarity of prior research focused on the lower extremity, a foot and ankle 3D computational model was created to explore the potential for these computational methods. The method of isolating CT scanned tissue and rendering a patient specific anatomy in the digital domain was accomplished by the use of MIMICS™ , SolidWorks™, and COSMOSMotion™ – all available in the commercial domain. The kinematics of the joints are driven solely by anatomically modeled soft tissue applied to articulating joint ...


Omnidirectional Vision System For A Soccer Playing Robot, Ben Abels, Mike Akers, Glenn Harden 2010 Indiana University - Purdue University Fort Wayne

Omnidirectional Vision System For A Soccer Playing Robot, Ben Abels, Mike Akers, Glenn Harden

Engineering Senior Design Projects

In August, 2007, Raytheon and IPFW initiated a 5-year project to develop a team of robots to compete in the RoboCup Middle Sized League. In the year of 2008-2009, an omnidirectional mobile robot platform was designed and built. The goal in the 2009-2010 year is to provide this robot the ability to “see”.
We are to create an omnidirectional vision system that is capable of locating and tracking an orange soccer ball anywhere on the playing field. The vision system we add to the robot must obey all rules and regulations of the RoboCup’s Middle Sized League. The vision ...


Design Of A Steel Bridge For The Asce 2010 Student Steel Bridge Competition, Martin Duffy, Seannan Mettert, Devin Webster 2010 Indiana University - Purdue University Fort Wayne

Design Of A Steel Bridge For The Asce 2010 Student Steel Bridge Competition, Martin Duffy, Seannan Mettert, Devin Webster

Engineering Senior Design Projects

No abstract provided.


Constant Tension Wire Let-Off, Jeff Wilder, Cory Trischler, Daniel Pucher 2010 Indiana University - Purdue University Fort Wayne

Constant Tension Wire Let-Off, Jeff Wilder, Cory Trischler, Daniel Pucher

Engineering Senior Design Projects

No abstract provided.


Optimizing The Wpi Assistive Technology Resource Center: Marketing And Documentation, Lydia George, Deepti Kalluri 2010 Worcester Polytechnic Institute

Optimizing The Wpi Assistive Technology Resource Center: Marketing And Documentation, Lydia George, Deepti Kalluri

Assistive Technology Resource Center Projects

The Assistive Technology Resource Center (ATRC) at Worcester Polytechnic Institute (WPI) was created in 1999 with the mission to serve as a regional provider of assistive devices and services. The Center is unique in its ability to provide a technical aspect to the development of customized assistive technology to its clients. An IQP group, Lyons and Trimby (2008), reevaluated the operations of the ATRC nine years after its establishment. The team determined that one area to focus on would be the organization of past projects completed within the ATRC into a centralized database. A second IQP group, Hristov, Mawhiney, and ...


Sobre La Suposición De Estado Cuasiestacionario En El Transporte De Calor De Una Ventana Doble, Francisco J. Valdes-Parada, Erika K. Flores-Romero, Geovanni Hernandez-Luna, Erick A. Aguilera-Romero 2010 Universidad Autonoma Metropolitana - Iztapalapa

Sobre La Suposición De Estado Cuasiestacionario En El Transporte De Calor De Una Ventana Doble, Francisco J. Valdes-Parada, Erika K. Flores-Romero, Geovanni Hernandez-Luna, Erick A. Aguilera-Romero

Francisco J. Valdes-Parada

Es sabido que la mayoría de las edificaciones modernas transfieren la mayor parte de la energía acumulada a través de ventanas. Por ello, en la medida en que se tengan modelos confiables para el transporte de calor a través de estos sistemas, se contará con mejores diseños que tienen una relación directa con el confort, ambiente y gasto energético de edificaciones. El modelado de la transferencia de calor en ventanas dobles suele llevarse a cabo considerando únicamente sus cristales y el aire atrapado entre ellos. Sin embargo, la temperatura del interior es, a su vez, una función del tiempo y ...


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