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Articles 1 - 16 of 16
Full-Text Articles in Entire DC Network
Time Effect Of Water Injection On The Mechanical Properties Of Coal And Its Application In Rockburst Prevention In Mining, Xiaofei Liu, Guang Xu, Chong Zhang, Biao Kong, Jifa Qian, Dong Zhu, Mingyao Wei
Time Effect Of Water Injection On The Mechanical Properties Of Coal And Its Application In Rockburst Prevention In Mining, Xiaofei Liu, Guang Xu, Chong Zhang, Biao Kong, Jifa Qian, Dong Zhu, Mingyao Wei
Mining Engineering Faculty Research & Creative Works
Coal seam water injection is widely used to prevent rockbursts in coal mines, and the duration of water injection is an important parameter related to the effectiveness of rockburst prevention, making it of practical importance to optimize the effective water injection duration. This paper presents the test results of the mechanical properties and pore structure of samples with different soaking time, obtained from a working face where rockburst occurred. Soaking time changes the mechanical properties of samples, and this time effect differs with the coal size (from centimeter to nanometer size). Results of numerical simulation and on-site tests in the …
Functional Variability In A Whole Body Co-Ordinated Movement, Michael Hiley, Fred Yeadon
Functional Variability In A Whole Body Co-Ordinated Movement, Michael Hiley, Fred Yeadon
ISBS Proceedings Archive
Gymnasts flex at the hips in the lower part and extend in the upper part of the giant circle. In order to perform a sequence of circles at even tempo, any variation in angular velocity at the end of the flexion phase needs to be reduced by the end of the extension phase. The aim of this study was to determine the nature and contribution of such adjustments. A computer simulation model of a gymnast on high bar was used to investigate strategies of (a) fixed timing of the extension phase (feedforward control) and (b) stretched timing (feedforward and feedback …
Twist Limits Of Late Twisting Double Somersaults On Trampoline, Maurice Yeadon, Michael Hiley
Twist Limits Of Late Twisting Double Somersaults On Trampoline, Maurice Yeadon, Michael Hiley
ISBS Proceedings Archive
The aim of this research study was to determine the twist limits for double somersaults on trampoline with the twist in the second somersault. An angle-driven computer simulation model of aerial movement was used to determine the maximum number of half twists that could be produced in a double somersault using asymmetrical movements of the arms and hips. Simulations of two limiting movements were found using simulated annealing optimisation to produce the required amounts of somersault, tilt and twist at landing after a flight time of 2.0 s. It was found that 3½ twists could be produced in the second …
Adjustment In The Flight Phase Of 1m Springboard Forward Pike Dives, Mohsen Sayyah, M. R. (Fred) Yeadon, Michael J. Hiley, Mark A. King
Adjustment In The Flight Phase Of 1m Springboard Forward Pike Dives, Mohsen Sayyah, M. R. (Fred) Yeadon, Michael J. Hiley, Mark A. King
ISBS Proceedings Archive
The aim of this study was to investigate the variability in 1m springboard forward pike dives (101B). Variability of body orientation angle at takeoff and water entry together with joint angle time histories of 15 forward pike dives, performed by an international diver, were determined using video analysis. A computer simulation model was used to investigate the effects of initial conditions variability and flight phase configuration variability on outcome (orientation at entry) variability. It was found that the variation in the simulated orientation at entry arising from variability in the initial conditions was greater than the actual variation. This indicates …
Using Microsoft Excel To Teach Simulation Concepts To Business Students, Robert F. Gordon Ph.D.
Using Microsoft Excel To Teach Simulation Concepts To Business Students, Robert F. Gordon Ph.D.
Faculty Works: MCS (1984-2023)
The application of computers to solving business problems, the area of study known as decision support systems, is an important component in the education of business students today. One major type of decision support system is computer simulation, which is the technique most often used to solve queuing problems in the industry. This paper describes how to teach the concepts of computer simulation, explain the key components of simulation software, and provide hands-on experience to solve these problems by using Microsoft Excel.
Metabolic Differentiation Of Early Lyme Disease From Southern Tick-Associated Rash Illness (Stari), C Molins, L Ashton, Gary Wormser, B Andre, A Hess, J Belisle
Metabolic Differentiation Of Early Lyme Disease From Southern Tick-Associated Rash Illness (Stari), C Molins, L Ashton, Gary Wormser, B Andre, A Hess, J Belisle
NYMC Faculty Publications
Lyme disease, the most commonly reported vector-borne disease in the United States, results from infection with Borrelia burgdorferi. Early clinical diagnosis of this disease is largely based on the presence of an erythematous skin lesion for individuals in high-risk regions. This, however, can be confused with other illnesses including southern tick-associated rash illness (STARI), an illness that lacks a defined etiological agent or laboratory diagnostic test, and is coprevalent with Lyme disease in portions of the eastern United States. By applying an unbiased metabolomics approach with sera retrospectively obtained from well-characterized patients, we defined biochemical and diagnostic differences between early …
Fundamental Studies And Applications Of Ambient Plasma Ionization Sources For Mass Spectrometry, Wade C. Ellis
Fundamental Studies And Applications Of Ambient Plasma Ionization Sources For Mass Spectrometry, Wade C. Ellis
Theses and Dissertations
The field of ambient desorption/ionization mass spectrometry (ADI-MS) has existed for over a decade. ADI-MS is a technique that offers benefits including fast analysis time, simple ionization sources that are easily constructed, and little to no required sample preparation. The research presented here describes efforts to better understand plasma-based ADI-MS sources and to explore the use of hydrogen-doped plasma gases with these sources. The use of hydrogen-doped argon (H2/Ar) and hydrogen-doped helium (H2/He) as plasma gases for a dielectric barrier discharge (DBD) and an AC glow discharge is presented first. When using the DBD, the intensity …
I Remembered I Am Happy, Emily Pan
I Remembered I Am Happy, Emily Pan
Masters Theses
This journal is a collection of thoughts on small actions and repetition and getting through getting places.
A Simulation Of Anthropogenic Mammoth Extinction, Matthew Klapman
A Simulation Of Anthropogenic Mammoth Extinction, Matthew Klapman
Undergraduate Honors Papers
There are multiple hypotheses as to why the Columbian Mammoth (Mammuthus columbi) and other megafauna in North America went extinct relatively recently and relatively quickly. The most popular of which are disease, climate change, meteorite strikes, and over hunting by humans [2, 9]. There is evidence to show that a combination of factors contributed to the megafaunal extinction, but ”overkill” explores the idea that early humans migrated onto the continent and then hunted the mammoths and other megafauna to extinction. The overkill hypothesis was first proposed by anthropologist Paul Martin in 1973 [8]. Evidence from radiocarbon dating shows that the …
Network Analysis Of Wildfire Transmission And Implications For Risk Governance, Alan A. Ager, Cody Evers, Michelle A. Day, Haiganoush K. Preisler, Ana M.G. Barros, Max Nielsen-Pincus
Network Analysis Of Wildfire Transmission And Implications For Risk Governance, Alan A. Ager, Cody Evers, Michelle A. Day, Haiganoush K. Preisler, Ana M.G. Barros, Max Nielsen-Pincus
Environmental Science and Management Faculty Publications and Presentations
We characterized wildfire transmission and exposure within a matrix of large land tenures (federal, state, and private) surrounding 56 communities within a 3.3 million ha fire prone region of central Oregon US. Wildfire simulation and network analysis were used to quantify the exchange of fire among land tenures and communities and analyze the relative contributions of human versus natural ignitions to wildfire exposure. Among the land tenures examined, the area burned by incoming fires averaged 57% of the total burned area. Community exposure from incoming fires ignited on surrounding land tenures accounted for 67% of the total area burned. The …
Simulation Of Anisoplanatic Imaging Through Optical Turbulence Using Numerical Wave Propagation With New Validation Analysis, Russell C. Hardie, Jonathan D. Power, Daniel A. Lemaster, Douglas Droege, Szymon Gladysz, Santasri Bose-Pillai
Simulation Of Anisoplanatic Imaging Through Optical Turbulence Using Numerical Wave Propagation With New Validation Analysis, Russell C. Hardie, Jonathan D. Power, Daniel A. Lemaster, Douglas Droege, Szymon Gladysz, Santasri Bose-Pillai
Faculty Publications
We present a numerical wave propagation method for simulating imaging of an extended scene under anisoplanatic conditions. While isoplanatic simulation is relatively common, few tools are specifically designed for simulating the imaging of extended scenes under anisoplanatic conditions. We provide a complete description of the proposed simulation tool, including the wave propagation method used. Our approach computes an array of point spread functions (PSFs) for a two-dimensional grid on the object plane. The PSFs are then used in a spatially varying weighted sum operation, with an ideal image, to produce a simulated image with realistic optical turbulence degradation. The degradation …
Simulation Of Magnetically Confined Inductively Coupled Plasma, Sina Javadpour
Simulation Of Magnetically Confined Inductively Coupled Plasma, Sina Javadpour
Electronic Theses and Dissertations
In this work, a new parallel coil design was presented to address the need for high density inductively coupled plasmas with enhanced properties and a more uniform and consistent distribution, suitable for large-area material processing. Fluid model simulations of 3D argon inductively coupled plasma (ICP) were performed in COMSOL for the proposed coil and a conventional single cylindrical coil with the same impedance to be used as reference, to compare and evaluate the performance of this new halftoroidal parallel coil design and study its effects on the main variables of the generated plasma. Through different comparisons of the simulations results, …
A Critical Review Of The Application Of Kolb's Experiential Learning Theory Applied Through The Use Of Computer Based Simulations Within Virtual Environments, 2000-2016, Daniel J. Grady
Legacy Theses & Dissertations (2009 - 2024)
This integrative research review aims to examine the application of Kolb’s theory of experiential learning through the use of simulations within virtual learning environments. It will first cover the framework of experiential learning as stated by Kolb, a learning theory that is finding new life within the context of simulations, role-playing games (RPGs), massive multiplayer role playing games (MMORPGs) and virtual environments. This analysis was conducted by making use of combined research strategies that focused specifically on both qualitative and quantitative reviews that utilized Kolb’s experiential theory of learning (ELT) within the context of the application of computer based simulations …
A Bayesian Testing Strategy For The Model-Test-Model Paradigm, Geoffrey W. Paul
A Bayesian Testing Strategy For The Model-Test-Model Paradigm, Geoffrey W. Paul
Theses
Testing for large and complex defense systems can be extremely expensive. A testing strategy is developed to leverage Bayesian Experimental Design concepts within the Model-Test-Model paradigm. Two utility functions are implemented to search the input space and select the test which maximizes the expected information gain per test. A priority-based strategy focuses on individual performance measures in order of importance. A weighted-sum strategy maximizes the information gained across all performance measures, with emphasis placed on higher priority measures which are further from their accuracy specifications. Monte Carlo simulations show that both strategies provide a statistically significant improvement over the baseline …
Impact Of A Localized Lean Six Sigma Implementation On Overall Patient Safety And Process Efficiency, Luvianca Gil, Pilar Pazos, Mamadou Seck, Rolando Delaguila
Impact Of A Localized Lean Six Sigma Implementation On Overall Patient Safety And Process Efficiency, Luvianca Gil, Pilar Pazos, Mamadou Seck, Rolando Delaguila
Engineering Management & Systems Engineering Faculty Publications
Continuous quality improvement tools have caught the attention of the Health Care Industry as a solution to process efficiency, patient safety and cost reduction. This research explores the impact of a Lean Six Sigma (LSS) process improvement initiative in overall process efficiency and patient safety in two Labor and Delivery (L+D) units of two large hospital providers. This study focuses on the application of modeling and simulation methodology to investigate the influence of a localized process improvement intervention on the overall L+D unit output, by considering patient flow, system capacity and unit performance. The simulation models capacity profiles and patient …
Reorganizing Algebraic Thinking: An Introduction To Dynamic System Modeling, Diana Fisher
Reorganizing Algebraic Thinking: An Introduction To Dynamic System Modeling, Diana Fisher
Mathematics and Statistics Faculty Publications and Presentations
System Dynamics (SD) modeling is a powerful analytical method used by professional scientists, academics, and governmental officials to study the behavior patterns of complex systems. Specifically through use of the Stella software, it is a method that I and others have used for over two decades with high school, and even middle school, math and science students. In this paper I describe an introduction to SD modeling intended for an algebra class (in either middle or high school). In the body of the paper, a nested sequence of simple bank account examples, increasing in complexity, is used to demonstrate a …