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1,116 full-text articles. Page 48 of 49.

System Dynamics Implementation Of An Extended Brander And Taylor-Like Easter Island Model, Takuro Uehara, Yoko Nagase, Wayne Wakeland 2010 Portland State University

System Dynamics Implementation Of An Extended Brander And Taylor-Like Easter Island Model, Takuro Uehara, Yoko Nagase, Wayne Wakeland

Systems Science Faculty Publications and Presentations

We provide a system dynamics implementation of a dynamic ecological economics model. Dynamic economic models are often constrained to use functions, such as the Cobb-Douglas function, chosen “conveniently” to allow for analytic solutions. The C-D function, however, suffers from its fixed elasticity that does not allow for the substitutability between man-made capital and natural capital to change, which is vital for economic sustainability. Using system dynamics removes this constraint and enables more realistic ecological economics models containing functions not amenable to analytic solution. The base model is the natural resource and population growth model developed by Brander and Taylor (1998 ...


Coupling Of Interactive Manufacturing Operations Simulation And Immersive Virtual Reality, Denis V. Dorozhkin, Judy M. Vance, Gordon D. Rehn, Marco Lemessi 2010 Iowa State University

Coupling Of Interactive Manufacturing Operations Simulation And Immersive Virtual Reality, Denis V. Dorozhkin, Judy M. Vance, Gordon D. Rehn, Marco Lemessi

Mechanical Engineering Publications

This paper presents a novel general-purpose simulation analysis application that combines concurrent operations simulation with the advanced data interrogation and user interaction capabilities of immersive virtual reality systems. The application allows for interactive modification of the simulation parameters, while providing the users with the available simulation information by effectively placing the operator in the midst of the environment being simulated. The major contribution of this research is the total integration of the immersive virtual reality environment with the simulation, allowing users in the environment to interactively change the inputs to the simulation as it is running. Implementation and functionality details ...


Composite Phase-Shifting Algorithm For Three-Dimensional Shape Compression, Nikolaus L. Karpinsky, Song Zhang 2010 Iowa State University

Composite Phase-Shifting Algorithm For Three-Dimensional Shape Compression, Nikolaus L. Karpinsky, Song Zhang

Mechanical Engineering Publications

With recent advancements in 3-D imaging and computational technologies, acquiring 3-D data is unprecedentedly simple. However, the use of 3-D data is still limited due to the size of 3-D data, especially 3-D video data. Therefore, the study of how to store and transmit the 3-D data in real time is vital. We address a technique that encodes a 3-D surface shape into a single 24-bit color image. In particular, this image is generated by advanced computer graphics tools with two primary color channels encoded as sine and cosine fringe images, and the third channel encoded as a stair image ...


Final Design Report: Vibration Table For Cvbt- Vt4 Design Team, Thomas Bevan, Matthew Laurino 2010 California Polytechnic State University - San Luis Obispo

Final Design Report: Vibration Table For Cvbt- Vt4 Design Team, Thomas Bevan, Matthew Laurino

Mechanical Engineering

CVBT (Center for Vocational Building Technology) teaches villagers in Northeastern Thailand how to make various concrete products. Many of these products require the use of a vibration table in order to remove air and water trapped within the concrete. Removal of these voids improves the outside surface of the molded concrete, and also allows the use of a lower water to cement ratio, allowing a much stronger finished product. The currently used vibration table (VT3) has several disadvantages associated with it, which the new table (VT4) eliminates. Compared with the VT3, the VT4 has a more rigid tabletop and improved ...


Flexible Digital Fringe Projection System For Step‐Height Measurement, Song Zhang, James H. Oliver 2010 Iowa State University

Flexible Digital Fringe Projection System For Step‐Height Measurement, Song Zhang, James H. Oliver

Mechanical Engineering Conference Presentations, Papers, and Proceedings

To circumvent the problems induced by nonlinear gamma of the commercial video projector, we recently developed a flexible method for 3‐D shape measurement that generates sinusoidal fringe patterns for 3‐D shape measurement by defocusing binary structured patterns. However, it can only measure “smooth” objects. In this paper, we propose a technique to generalize this technique for arbitrary step height measurement. In particular, the binary coding method is combined with this technique for point‐by‐point phase unwrapping. Experiments have verified the success of the proposed approach.


An Adaptive Nonparametric Modeling Technique For Expanded Condition Monitoring Of Processes, Matthew John Humberstone 2010 University of Tennessee - Knoxville

An Adaptive Nonparametric Modeling Technique For Expanded Condition Monitoring Of Processes, Matthew John Humberstone

Doctoral Dissertations

New reactor designs and the license extensions of the current reactors has created new condition monitoring challenges. A major challenge is the creation of a data-based model for a reactor that has never been built or operated and has no historical data. This is the motivation behind the creation of a hybrid modeling technique based on first principle models that adapts to include operating reactor data as it becomes available.

An Adaptive Non-Parametric Model (ANPM) was developed for adaptive monitoring of small to medium size reactors (SMR) but would be applicable to all designs. Ideally, an adaptive model should have ...


Composite Method For Discontinuous 3‐D Surface Measurement: Simulations, Nikolaus Karpinsky, Song Zhang 2010 Iowa State University

Composite Method For Discontinuous 3‐D Surface Measurement: Simulations, Nikolaus Karpinsky, Song Zhang

Mechanical Engineering Conference Presentations, Papers, and Proceedings

This paper presents a method for discontinuous surface measurement by using only four fringe images. The technique has the advantage of measurement speed over conventional methods with similar capabilities that rely on utilizing at least nine fringe images. Simulation results demonstrated that the technique can be used to effectively measure steep height variations in an object as well as discontinuous surfaces.


A Modular Implementation Of Wii Remote Head Tracking For Virtual Reality, Ryan A. Pavlik, Judy M. Vance 2010 Iowa State University

A Modular Implementation Of Wii Remote Head Tracking For Virtual Reality, Ryan A. Pavlik, Judy M. Vance

Mechanical Engineering Conference Presentations, Papers, and Proceedings

Virtual reality (VR) environments based on interactive rendering of 3D computer graphics often incorporate the use of position and orientation tracking on the user’s head, hands, and control devices. The Wii Remote game controller is a massmarket peripheral that can provide a low-cost source of infrared point tracking and accelerometer data, making it attractive as a PC-based virtual reality head tracking system. This paper describes the development of an extension to the Virtual Reality Peripheral Network (VRPN) software to support the use of the Wii Remote game controller as a standard tracker object in a wide range of VR ...


Catheter Laser Drill, Brady Haug 2010 California Polytechnic State University San Luis Obispo

Catheter Laser Drill, Brady Haug

Industrial Technology and Packaging

The project that I have undertaken is to improve upon an existing machine and process at Applied Medical, a medical device company. The machine is used to drill four holes into the body of a catheter. The holes are located on a linear axis, rotated 90 degrees apart from each other. Currently, the machine utilizes a traditional drill bit to create the four holes. This creates burrs along the holes, which increases the manufacturing time because a worker must remove them. The project calls for the use of a laser to replace the drill bit. The machine designed through this ...


A Concise Model Of 3x7 Wire Rope Used In Cable Guardrail Systems, Cody S. Stolle 2010 University of Nebraska-Lincoln

A Concise Model Of 3x7 Wire Rope Used In Cable Guardrail Systems, Cody S. Stolle

Mechanical (and Materials) Engineering -- Dissertations, Theses, and Student Research

Wire rope is a versatile, flexible, high-strength member that is used in many mechanical systems. However, due to the complexity of wire rope, analytical investigations have been relatively limited. Previous attempts to create simplified models of wire rope were not validated with physical testing and used a cumbersome beam-and-shell or beam-and-solid method for simulating the wire rope. An improved LS-DYNA model of 19-mm diameter 3x7 wire rope commonly used in roadside cable guardrail installations has been developed. A Belytschko-Schwer beam element was selected along with material *MAT_166. Since wire rope displays internal damping due to friction of strands and wires ...


Determination Of Material Emission Signatures By Ptr-Ms And Their Correlations With Odor Assessments By Human Subjects, Kwanghoon Han 2010 BEESL Lab., Syracuse University

Determination Of Material Emission Signatures By Ptr-Ms And Their Correlations With Odor Assessments By Human Subjects, Kwanghoon Han

Kwanghoon Han

The objectives of this study were to determine volatile organic compound (VOC) emission signatures of nine typical building materials by using proton transfer reaction-mass spectrometry (PTR-MS) and to explore the correlation between the PTR-MS measurements and the measurements of acceptability by human subjects. VOC emissions from each material were measured in a 50-l small-scale chamber. Chamber air was sampled by PTR-MS to determine emission signatures. Sorbent tube sampling and TD-GC/MS analysis were also performed to identify the major VOCs emitted and to compare the resulting data with the PTR-MS emission signatures. The data on the acceptability of air quality ...


Flexible 3d Shape Measurement Using Projector Defocusing: Extended Measurement Range, Song Zhang 2010 Iowa State University

Flexible 3d Shape Measurement Using Projector Defocusing: Extended Measurement Range, Song Zhang

Mechanical Engineering Publications

A recently proposed flexible 3D shape measurement technique using a defocused projector [ Opt. Lett. 34, 3080 (2009) ] shows great potential because of its elimination of projector’s gamma calibration. However, it cannot handle step-height surfaces. I present here a technique to extend its measurement range to an arbitrary shape by integrating a binary coding method. A computational framework is also proposed to tackle the problems related to the defocusing.


A Prediction Of The Acoustical Output Of A Golf Driver Head Using Finite Elements, Roger Sharpe 2010 California Polytechnic State University, San Luis Obispo

A Prediction Of The Acoustical Output Of A Golf Driver Head Using Finite Elements, Roger Sharpe

Master's Theses

A simulation was created using LS-DYNA® to determine the acoustical properties of a golf ball and golf driver head impact. LS-DYNA® has a coupled finite element analysis (FEA) and boundary element method (BEM) solver that uses the integral form of Helmholtz’s acoustic wave equation to deliver predicted sound pressure levels at predetermined acoustic points. Validation of the modeling was done on a simple plate donated by Titleist Golf. The plate was modeled and meshed using TrueGrid and impacted by a three layer golf ball model derived from “Tanka’s” paper on multilayered golf balls. The final converging model consisted ...


A Microflow Cytometer On A Chip, Joel P. Golden, Jason Kim, George P. Anderson, Nicole N. Hashemi, Peter J. Howell, Frances S. Ligler 2010 Iowa State University

A Microflow Cytometer On A Chip, Joel P. Golden, Jason Kim, George P. Anderson, Nicole N. Hashemi, Peter J. Howell, Frances S. Ligler

Nastaran Hashemi

A rapid, automated, multi-analyte Microflow Cytometer is being developed as a portable, field-deployable sensor for onsite diagnosis of biothreat agent exposure and environmental monitoring. The technology relies on a unique method for ensheathing a sample stream in continuous flow past an interrogation region where optical fibers provide excitation and collect emission. This approach efficiently focuses particles in the interrogation region of the fluidic channel, avoids clogging and provides for subsequent separation of the core and sheath fluids in order to capture the target for confirmatory assays and recycling of the sheath fluid. Fluorescently coded microspheres provide the capability for highly ...


Grafika Inżynierska Ćw., Wojciech M. Budzianowski 2010 Wroclaw University of Technology

Grafika Inżynierska Ćw., Wojciech M. Budzianowski

Wojciech Budzianowski

No abstract provided.


Projektowanie Procesów Biotechnologicznych Proj., Wojciech M. Budzianowski 2010 Wroclaw University of Technology

Projektowanie Procesów Biotechnologicznych Proj., Wojciech M. Budzianowski

Wojciech Budzianowski

No abstract provided.


Projektowanie I Optymalizacja Procesów Proj., Wojciech M. Budzianowski 2010 Wroclaw University of Technology

Projektowanie I Optymalizacja Procesów Proj., Wojciech M. Budzianowski

Wojciech Budzianowski

No abstract provided.


Metody Numeryczne Lab., Wojciech M. Budzianowski 2010 Consulting Services

Metody Numeryczne Lab., Wojciech M. Budzianowski

Wojciech Budzianowski

No abstract provided.


Odnawialne Źródła Energii W., Wojciech M. Budzianowski 2010 Wroclaw University of Technology

Odnawialne Źródła Energii W., Wojciech M. Budzianowski

Wojciech Budzianowski

No abstract provided.


Performance Of Hardware Accelerated Particle Swarm Optimization With Digital Pheromones On Dissimilar Computing Platforms, Vijay Kalivarapu, Eliot H. Winer 2010 Iowa State University

Performance Of Hardware Accelerated Particle Swarm Optimization With Digital Pheromones On Dissimilar Computing Platforms, Vijay Kalivarapu, Eliot H. Winer

Mechanical Engineering Conference Presentations, Papers, and Proceedings

Programmable Graphics Processing Units (GPUs) have lately become promising means to perform scientific computations. When appropriately formulated, population based algorithms such as Particle Swarm Optimization (PSO) can leverage the data parallel architecture of GPUs dramatically improving the solution efficiency characteristics. Prior work by the authors demonstrated the feasibility for using GPUs for solving multidimensional optimization problems with digital pheromones in PSO using OpenGL Shading Language (GLSL). However, the programmability of GPUs in recent years fostered the development of a variety of programming languages making it challenging to select a computing language and use it consistently without the pitfall of being ...


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