Digital Commons Network^™

Design And Implementation Of A New Multilevel Inverter Topology With Shared Power Switches / Jafferi Bin Jamaludin, Jamaludin Jafferi

Student Works (2010-2019)

The increasing attention drawn on multilevel inverters particularly in medium and high power applications has led to the enhanced efforts and initiatives to improve the features and competitiveness of multilevel inverters. This research is part of such efforts and initiatives, with the intended improvement is targeted at reducing circuit complexity and cost. For this purpose, a new three-phase multilevel inverter topology based on switch-sharing approach has been proposed in this research. The topology is made up of three modules. Combination of Module 1 and Module 2 produces an arrangement of the conventional full-bridge circuit with three bidirectional switches. Module 3 …

Project Risk Identification For Government Projects In Anchorage And Palmer, August R. Banks

Student Projects for Graduate Degrees

This study reflects the research and analysis associated with identification of risk classifications and potential risks (both positive and negative) for use in project risk analyses in government projects managed via contract. Relying on literature reviews and surveys, a risk breakdown structure (RBS) and risk register with mitigation strategies are developed for use as a checklist by the organizations participating in the project; the General Services Administration (GSA) and the Plant Materials Center of the Alaska Department of Natural Resources (DNR/PMC). The survey findings support the original objective of establishing a common core of risks among the participating organizations. The …

Evaluation Of The Mass Transfer Effect Of The Stalk Contraction–Relaxation Cycle Of Vorticella Convallaria, Jiazhong Zhou

Department of Mechanical and Materials Engineering: Dissertations, Theses, and Student Research

Vorticella convallaria is a genus of protozoa living in fresh water. It has a bell-shaped zooid equipped with adoral ciliary bands and a contractile stalk tethering the zooid to a substrate. Vorticella is regarded as a biological spring because its contractile stalk can pull the zooid towards the substrate at a remarkably high speed and then relaxes to its extended state much more slowly. However, reasons for Vorticella’s stalk contraction are still unknown. It is presumed that the flow field induced by the contraction-relaxation cycle of Vorticella would augment mass transfer effect near the substrate. We investigated this hypothesis …

Faculty Senate Executive Committee Agenda, December 8, 2014, Utah State University

Faculty Senate & Faculty Senate Executive Committee

• Update on Electronic P&T Binders
• EPC Items for December
• Council on Teacher Education
• Scholarship Advisory Board
• Code Change 402.12.3 Committee on Committees Term(Second reading)
• PTR Working Group Recommendations
• AFT code change proposals (send to PRPC?)

The Ranking Of Contractors To The U.S. Department Of Defense According To Integrated Power Blocs Among The Contractors, F. Gregory Hayden, Elliot G. Campbell, Shannon Cummins

Marketing & Entrepreneurship Faculty Publications

Knowledge about the power and misbehavior of defense contractors is substantial; yet their power continues to grow in full view of a record of waste, fraud, corrupt activity, and the failure to perform contracts. The knowledge base about defense contractors has not been sufficient to effectively oppose their extensive power. Knowledge is needed about how the boards of directors of the defense corporations are interlocked. That work is initiated in this article by ranking the top defense contractors in terms of the number of power blocs to which the corporations belong in the defense contractors' power-bloc network.

Wave Energy Devices With Compressible Volumes, Adi Kurniawan, Deborah Greaves, John Chaplin

School of Engineering, Computing and Mathematics

No abstract provided.

Privacy Doesn't Exist In A Vacuum, Dawinder S. Sidhu

Faculty Scholarship

No abstract provided.

A Review Of The Design Of A Pedestrian Bridge In Cape Girardeau As Part Of The Senior Design Requirements Of The College Of Engineering, Amir Rezaeivahdati

Honors Theses

This paper analyzes the process, challenges and results of the design of the superstructure of a pedestrian bridge in Cape Girardeau, Missouri, as part of the extension of the existing Riverwalk trail along the Mississippi River. The project was assigned to three groups of students in the Senior Design B class of Fall 2014.

The original project consisted of an approximately 1700 ft pedestrian/bicycle trail along the river, a bridge over Aquamsi street and the railroad track and designing bicycle paths along the Fountain street and Morgan Oak street to connect to the existing trail (Figure 1.) Two groups consisted …

An Unstandard Way Of Using The Cubesat Standard, Robert J. Twiggs, Amin Djamshidpour, Steward Davis, Ben Malphrus

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint presentation created by Professor Bob Twiggs, Amin Djamshidpour, Steward Davis, and Ben Malphrus titled  "An Unstandard way of Using the CubeSat Standard" from November 8, 2014.

Board Of Directors Meeting Minutes (December 8, 2014), Dmacc

Board of Directors Meeting Minutes

This file contains the minutes from the Des Moines Area Community College Board meeting held on December 8, 2014.

Ohio University Faculty Senate Minutes December 8, 2014, Angela Brock

Faculty Senate Minutes

No abstract provided.

Toy Train Group 1, Peter A. Szostak, Chris Levin, Chris Haeberle

Mechanical Engineering Design Project Class

Create a toy train that lays its own tracks.

Team Sunflower - Solar Tracker Team 2, Lindsey Warden, Laura Scott, Ethan Glassman, Max Kapczynski

Mechanical Engineering Design Project Class

Our design problem was to create a solar radiation tracking device. The primary goal of this device was to keep a solar panel perpendicular to the solar radiation with 95% efficiency throughout the day. The tracker had to be able to account for the sun’s seasonal angle in St. Louis, and the design would be even better if it could account for the sun’s seasonal angle at any latitude. Another important aspect of the solar tracker design was that it must be able to reset itself each day for the sunrise without human input. Other aspects to consider were weatherproofing …

Mems 411 Rc Glider 2.0 Senior Design Project, Armando Gallegos, Sayan Patra, Reggie S. Clark, Diego Alarcon

Mechanical Engineering Design Project Class

Design a radio controlled scale model glider with a true "morphing" wing.

Mems 411 Senior Design: Wind Powered Walking Robot, Timothy J. Elliott, Kenna Middleton, Jose Rodes

Mechanical Engineering Design Project Class

Build a ‘Machine That Walks’ using leg like linkages that is only powered by wind. It must walk a minimum of 4 meters to prove that it is capable of walking and at least half of the materials used must be recyclable or reusable within the greater St. Louis area. The machine must not exceed 10 kg and must fit in the volume of 30 cm x 60 cm x 40 cm and must be unable to be easily knocked over.

The Eastern Echo, December 8, 2014, Eastern Michigan University

EMU Student Newspaper: The Normal News & The Eastern Echo

No abstract provided.

December 8, 2104: Science Grant For Women, Brother Myron Dies, Wine For Scholarships, Saint Mary's College Of California

SMC Bulletin 2013-2020

No abstract provided.

Microstructural Deformation And Failure Of An Al-Mg Alloy With A Bimodal Grain Size Distribution, Andrew C. Magee

Doctoral Dissertations

Grain size reduction has been known as a strengthening mechanism in most metals. The improvements in strength are at the cost of ductility in Al 5083, so a microstructure with a bimodal grain size distribution consisting of coarse grained (CG) and ultrafine grained (UFG) phases was developed. This creates a complex, inhomogeneous microstructure that can be difficut to predict and analyze. In this work this material is studied through a combination of experimetnal work and finite element simulations.

A full-factorial experimental design is developed for tensile tests under a variety of experiemental condtions using a custom devloped small scale specimen …

College Of Engineering News, Georgia Southern University

College of Engineering & Computing: News & Publications (2010-2023)

• Sustainable Wind Energy Harvesting
• E. Simons wins VibrAlign National Award

Nebraska Center For Educational Science Outreach: A Clearinghouse Meeting People At Their Level To Make Stem Outreach Easier, Kiyomi D. Deards

University of Nebraska-Lincoln Libraries: Presentations

Identify key partners and stakeholders.

Conduct a STEM outreach needs assessment.

Develop a long-term plan.

1. How can faculty & staff support your STEM outreach?

2. How can you help faculty & staff with STEM outreach?

Changing The Face Of The Earth: The Morrison-­Knudsen Corporation As Partner To The U.S. Federal Government, Christopher S. Blanchard

Dissertations and Theses

Beginning with reclamation projects in the western U.S., the heavy construction industry helped the federal government grow in size and sophistication in the twentieth century. The Morrison-­Knudsen Corporation throughout the twentieth century represented one of the federal government's favored contractors. Following western reclamation projects, the U.S. federal government then used contractors to help move the U.S. economy out of the Depression, prepare for World War II, wage the Cold War at home and abroad, and win the space race. Thus, at key stages in United States history we observe the necessity of the U.S. federal government partnering with the heavy …

An Empirical Estimation Of Statistical Inferences For System Dynamics Model Parameters, Mohammed Mesabbah, Wael Rashwan, Amr Arisha

Conference papers

For system dynamics simulation (SD) models, an estimation of statistical distributions for uncertain parameters is crucial. These distributions could be used for testing models sensitivity, quality of policies, and/or estimating confidence intervals for these parameters. Assumptions related to normality, independence and constant variation are often misapplied in dynamic simulation. Bootstrapping holds a considerable theoretical advantage when used with non-Gaussian data for estimating empirical distributions for unknown parameters. Although it is a widely acceptable approach, it has had only limited use in system dynamics applications. This paper introduces an application of Direct Residual Bootstrapping (DRBS) for statistical inference in system dynamic …

Perspectives On Languages For Specifying Simulation Experiments, Luiz Felipe Perrone, Johannes Schützel, Danhua Peng, Adelinde Urhmacher

Faculty Journal Articles

While domain specific languages are well established for describing the system of interest in modeling and simulation, the last years have seen increasingly domain specific languages also exploited for specifying experiments. This development, whose application areas range from computational biology to network simulation, is motivated by the desire to facilitate the reproducibility of simulation results. Thereby, the experimentation process is treated as a first class object of simulation studies. As the experimentation process contains different tasks such as configuration, observation, analysis, and evaluation, domain-specific languages can be exploited to specify experiments as well as individual sub-tasks or even the goal …

Adsorption Of Some Metal Ions From Aqueous Solution On Iraqi Rice Bran And Its Relation To The Physical Properties Of These Metal Ions, Samir Mahmood Jasim

Baghdad Science Journal

Adsorption studies were carried out to test the ability of the Iraqi rice bran (Amber type) to adsorb some metals divalent cations (Cd2+, Co2+, Cu2+, Fe2+, Ni2+, Pb2+, and Zn2+) as an alternative tool to remove these pollutants from water. The Concentrations of these ions in water were measured using flame and flamless atomic absorption spectrophotometry techniques. The applicability of the adsorption isotherm on Langmuir or Freundlisch equation were tested and found to be dependent on the type of ions. The results showed different adsorptive behavior and different capacities of the adsorption of the ions on the surface of the …

The Modified Quadrature Method For Solving Volterra Linear Integral Equations, Mahmood A. Shamran, Sami Abdulla Abid

Baghdad Science Journal

In this paper the modified trapezoidal rule is presented for solving Volterra linear Integral Equations (V.I.E) of the second kind and we noticed that this procedure is effective in solving the equations. Two examples are given with their comparison tables to answer the validity of the procedure.

Convergence Of The Generalized Homotopy Perturbation Method For Solving Fractional Order Integro-Differential Equations, Sameer Qasim Hasan, Ali Adnan Abdul Sahib

Baghdad Science Journal

In this paper,the homtopy perturbation method (HPM) was applied to obtain the approximate solutions of the fractional order integro-differential equations . The fractional order derivatives and fractional order integral are described in the Caputo and Riemann-Liouville sense respectively. We can easily obtain the solution from convergent the infinite series of HPM . A theorem for convergence and error estimates of the HPM for solving fractional order integro-differential equations was given. Moreover, numerical results show that our theoretical analysis are accurate and the HPM can be considered as a powerful method for solving fractional order integro-diffrential equations.

New Iterative Method For Solving Nonlinear Equations, Rasha J. Mitlif

Baghdad Science Journal

The aim of this paper is to propose an efficient three steps iterative method for finding the zeros of the nonlinear equation f(x)=0 . Starting with a suitably chosen X0 , the method generates a sequence of iterates converging to the root. The convergence analysis is proved to establish its five order of convergence. Several examples are given to illustrate the efficiency of the proposed new method and its comparison with other methods.

Hydraulic External Pre-Isolator System For Ligo 235001, S. Wen, R. Mittleman, K. Mason, J. Giaime, R. Abbott, J. Kern, B. O'Reilly, R. Bork, M. Hammond, C. Hardham, B. Lantz, W. Hua, D. Coyne, G. Traylor, H. Overmier, T. Evans, J. Hanson, O. Spjeld, M. Macinnis, K. Mailand, D. Ottaway, D. Sellers, K. Carter, P. Sarin

Faculty Publications

The hydraulic external pre-isolator (HEPI) is the first six degrees of freedom active seismic isolation system implemented at the Laser Interferometer Gravitational Wave Observatory (LIGO). Implementation was first completed at the LIGO Livingston Observatory (LLO) prior to LIGO's fifth science run7, successfully cutting down the disturbance seen by LLO's suspended optics in the two most prominent seismic disturbance bands, the microseism (0.1-0.3 Hz) and the anthropogenic (1-3 Hz) bands, by a factor of a few to tens. The improvement in seismic isolation contributed directly to LLO's much improved duty cycle of 66.7% and LIGO's triple coincident duty cycle of 53%. …

Data Visualization For Network Simulations, Luiz Felipe Perrone, Greg L. Shrock, Christopher S. Main

Faculty Journal Articles

As many other kinds of simulation experiments, simulations of computer networks tend to generate high volumes of output data. While the collection and the statistical processing of these data are challenges in and of themselves, creating meaningful visualizations from them is as much an art as it is a science. A sophisticated body of knowledge in information design and data visualization has been developed and continues to evolve. However, many of the visualizations created by the network simulation community tend to be less than optimal at creating compelling, informative narratives from experimental output data. The primary contribution of this paper …

The Effect Of Temperature And Chemical Solutions On The Compressive Strength Of Particulate Hybrid Composites, Ali Hassan R.H Al-Azzawi

Baghdad Science Journal

In this work a hybrid composite materials were prepared containing matrix of polymer (polyethylene PE) reinforced by different reinforcing materials (Alumina powder + Carbon black powder CB + Silica powder). The hybrid composite materials prepared are: • H1 = PE + Al2O3 + CB • H2 = PE + CB + SiO2 • H3 = PE + Al2O3 + CB + SiO2 All samples related to electrical tests were prepared by injection molding process. Mechanical tests include compression with different temperatures and different chemical solutions at different immersion times The mechanical experimentations results were in favour of the samples (H3) …