Digital Commons Network^™

Rigid Finite Element Model Of A Cracked Rotor, Zbigniew Kulesza, Jerzy T. Sawicki

Mechanical Engineering Faculty Publications

The article introduces a new mathematical model for the cracked rotating shaft. The model is based on the rigid finite element (RFE) method, which has previously been successfully applied for the dynamic analysis of many complicated, mechanical structures. In this article, the RFE method is extended and adopted for the modeling of rotating machines. An original concept of crack modeling utilizing the RFE method is developed. The crack is presented as a set of spring–damping elements of variable stiffness connecting two sections of the shaft. An alternative approach for approximating the breathing mechanism of the crack is introduced. The approach …

Faculty Member’S Film To Air On Hec-Tv In September, Lindenwood University

Archived Lindenwood Press Releases

No abstract provided.

University Of Northern Iowa Faculty Senate Meeting Agenda, August 27, 2012, University Of Northern Iowa. Faculty Senate.

Documents - Faculty Senate

Meeting agenda from the Faculty Senate of the University of Northern Iowa.

University Of Northern Iowa Faculty Senate Meeting Minutes, August 27, 2012, University Of Northern Iowa. Faculty Senate.

Documents - Faculty Senate

Meeting minutes from the Faculty Senate of the University of Northern Iowa.

2012-13 Faculty Senate - August 27, 2012 Minutes Summary, Faculty Senate

Faculty Senate Agendas & Minutes

No abstract provided.

August 27, 2012, The Daily Mississippian

Daily Mississippian (all digitized issues)

No abstract provided.

Effect Of Halite And Calcite Coatings On Thermal Infrared Spectra Wih Implications For Mars Exploration, Jeffrey A. Berger

Earth and Planetary Sciences ETDs

Knowing the occurrence and distribution of soluble ionic salts allows us to model the aqueous history and geochemical conditions of surface solutions on Mars. Salts deposited as coatings are particularly important for attaining this knowledge because the thermal infrared (TIR) remote sensing method for determining mineral abundance is limited to the top few hundred micrometers of the surface. To better understand the TIR properties of salt coatings, we investigated the effects of coating thickness and texture on the TIR reflectance spectra of halite- and calcite-coated glasses. We evaluated salt coating textures that could occur on Mars: 1) continuous, uniformly thick …

Newsroom, Georgia Southern University

Newsroom (2006-2023)

• Georgia Southern University Appoints Athletic Director Search Committee, Hires Search Firm

State V. Day Respondent's Brief Dckt. 39165

Idaho Supreme Court Records & Briefs, All

No abstract provided.

Magnetic Properties Of The S=1/2 Quasisquare Lattice Antiferromagnet Cuf2(H2o)(2)(Pyz) (Pyz = Pyrazine) Investigated By Neutron Scattering, C H. Wang, M D. Lumsden, R S. Fishman, G Ehlers, T Hong, W Tian, H Cao, A Podlesnyak, C Dunmars, J A. Schlueter, Jamie L. Manson, A D. Christianson

Chemistry and Biochemistry Faculty Publications

We have performed elastic and inelastic neutron scattering experiments on single crystal samples of the coordination polymer compound CuF2(H2O)(2)(pyz) (pyz = pyrazine) to study the magnetic structure and excitations. The elastic neutron diffraction measurements indicate a collinear antiferromagnetic structure with moments oriented along the [0.7 0 1] real-space direction and an ordered moment of 0.60 +/- 0.03 mu(B)/Cu. This value is significantly smaller than the single-ion magnetic moment, reflecting the presence of strong quantum fluctuations. The spin wave dispersion from magnetic zone center to the zone boundary points (0.5 1.5 0) and (0.5 0 1.5) can be described by a …

State V. Ward Clerk's Record Dckt. 40069

Idaho Supreme Court Records & Briefs, All

No abstract provided.

Mindfulness In Education : The Impact Of Mental Training On Attention And Working Memory In Children, Julia Keller

Psychology ETDs

Mindfulness (MF) is the self-regulation of attention, including sustained attention, switching attention between tasks, and the inhibition of elaborative processing. Another type of attentional skill not specifically targeted in this definition, but that might benefit from MF training, is control over working memory (WM), a type of executive attention: the ability to use attention to maintain or suppress short-term representations of information. Greater WM capacity also means an increased ability to use attention to overcome distraction and is predictive of performance on higher-order cognitive tasks. In this study, I hypothesized that, after eleven weeks of MF training, participants would have …

An Innovative Solution Set Of Algorithm For Converting Architectural Drawings To Vector-Based Computer Graphics, Yuye Peng

Durham School of Architectural Engineering and Construction: Dissertations, Theses, and Student Research

Appraisal Floor Plan Sketch (AFPS) as a simplified architectural floor plan shows the bird's eye view of a building’s spatial arrangement. An efficient automated vectorization system of AFPS not only fulfills AFPS’s preservation and dissemination purposes but also helps extract the building’s geometric information, which can be used to create 3D models of the building and improve building energy efficiency. The purpose of this study is to develop an automated system for converting scanned AFPS into vector based computer graphics.

Text/graphic separation and corner detection are two essential components in this vectorization system. Text/graphic separation ensures that only graphic data …

Issues Confronting Technology Education: An International Perspective, John M. Ritz

STEMPS Faculty Publications

As technology education progresses, professionals encounter problems that are unique to this school subject and their localized educational and cultural environments. This paper will review issues related to implementing technology education identified through contacts with international professional leaders over a three year period. The research will cite issues affecting the progression of technology education in different countries as identified by professional educators who work in these countries. The researcher will attempt to categorize these issues to provide perspective to the profession.

More Than 2,000 Freshmen Set To Rush Football Stadium, Admin

University of Mississippi News

No abstract provided.

Mcsa Forum Minutes 08/27/2012, Morris Campus Student Association

Morris Campus Student Association

No abstract provided.

Numerical Analysis Of Tsv/Micro-Bump Deformation Due To Chip Misalignment And Thermal Processing In 3d Ic Packages, Richard Johnson

Mechanical Engineering ETDs

Three-dimensional (3D) stacking of integrated circuits (ICs) is an enabling technology in the advancement of the microelectronics industry. 3D stacking enables increased device density per volume and improved electrical performance through short vertical interconnect paths. Mechanical reliability of 3D IC packages is critical due to the widespread use of electronic devices. Misalignment induced shear deformation of the through-silicon vias (TSV) and solder micro-bumps are simulated through an applied shearing action. Thermal effects due to coefficient of thermal expansion (CTE) mismatch during processing are also studied to provide trends of stress and deformation fields. Reliability of the 3D chip stack, TSV …

Photonic Generation Of Microwave Signals : A Quantum Dot Mode Locked Laser As A Microwave Source, Georgios Atmatzakis

Electrical and Computer Engineering ETDs

Microwave signals can be photonically generated inside a quantum dot, passively mode locked laser. In order for this laser to be used as a microwave source, a microwave interface was created and connected to the laser. To characterize the source, its output microwave impedance was measured by using the load-pull technique. Also, the device was characterized in terms of output power, frequency and linewidth. The output frequency of the generated signal was 5GHz with a linewidth <2MHz. The output power that was extracted was as high as -6dBm without any further amplification. An active antenna element was connected to the laser to transmit the generated microwave signal. In addition, the injection locking of the laser to an external source was studied and demonstrated, as a way to increase the stability of the output microwave signal and to amplify its power by combining the output signals of multiple locked sources. Further applications of the laser as a feeding source in an antenna array were studied by building a quantum dot laser fed active microwave antenna array with injection locked sources.

Dean Logan's Blog: A Salute To Women’S Rights, Roger Williams University School Of Law

Law School Blogs

No abstract provided.

August 27, 2012

The Gavel Gazette

No abstract provided.

Uranium-Series Geochronology And Stable Isotope Analysis Of Travertine From Soda Dam, New Mexico : A Quaternary Record Of Episodic Spring Discharge And Rivern Incision In The Jemez Mountains Hydrothermal System, April Jean Tafoya

Earth and Planetary Sciences ETDs

High precision uranium-series (U-series) geochronology provides data on timing of travertine deposition at Soda Dam, and a paleohydrologic record for the Valles Caldera hydrothermal system in Northern New Mexico for at least the last 500 ka. Travertine-depositing springs occur in San Diego Canyon, the only surface drainage outlet for the Valles Caldera, along the intersection of the Jemez fault zone (JFZ) and the Jemez River. This travertine-depositing hot spring system is part of the Valles Caldera geothermal system, which has been active throughout the Quaternary and explored for the past three decades for geothermal energy potential. New dates, compiled with …

San Antonio Express News: Ole Miss Home To More Than Just Mannings, Admin

University of Mississippi News

No abstract provided.

Quantifying The Contribution Of Bank Storage Due To An Alteration In Stream Stage, Jeffrey Samson

Civil Engineering ETDs

The desire to control rivers to reduce risks of flooding while providing water storage for municipal and agricultural uses has resulted in the disconnection of rivers from their floodplains. An important and often neglected outcome of this detachment is the loss of a plethora of important ecosystem services. This research was focused on answering the following questions related to riparian groundwater storage (bank storage): 1) What is the time to saturation (maximum storage) and time to release of bank storage water as the result of a flood pulse that overbanks a portion of the floodplain?; 2) How does soil stratigraphy …

An Overview Of Laser Operation And Modelocking Of A Vertical External Cavity Surface Emitting Laser (Vecsel), Aaron Allen

Optical Science and Engineering ETDs

VECSEL laser systems are important additions to the family of lasers. They exhibit a combination of desirable lasing features that are usually not simultaneously attainable. These features are high power, diffraction limited beam quality, intra-cavity frequency doubling, tunability, and ultrashort pulses generated from passive mode-locking. In this work, we give a brief overview of the VECSEL structure, previous VECSEL literature, how lasing in a VECSEL works, and how mode locking in a VECSEL works.

The Effect Of Carbon Dioxide On The Density And Compressibility Of Kimberlitic Magma, Alison R. Santos

Earth and Planetary Sciences ETDs

Constraints were placed on the density of kimberlitic melts containing varying amounts of CO2 using high pressure sink/float experiments. The melt composition used was carefully selected and was prepared free of H2O and minor elements in order to focus on the effect of CO2. Experiments were run in graphite capsules over a pressure range of 4-10 GPa in a multi-anvil apparatus using Fo100 and Fo90 spheres as density markers. The compositions used contained 0, 3, 6, and 12 wt% CO2 and were derived from mixing the 0 and 12 wt% CO2 compositions together. Run products were analyzed with FTIR to …

The Social Validation Of Behaviors Included In The Critical Events Index Of The Systematic Screening For Behavior Disorders In Male Saudi Arabia Primary Schools, Emad Alwan

Special Education ETDs

The purpose of this study was to: (a) identify which behaviors from the Systematic Screening for Behavior Disorders (SSBD) Critical Events Index occur in male Saudi Arabia primary schools and how often teachers perceive their occurrence; (b) determine the extent of concern male Saudi Arabia primary school teachers report regarding these behaviors; and (c) investigate male Saudi Arabia primary school teachers perception regarding the importance of taking courses that emphasize students' behavior problems and how to deal with them. A sample of 381male participants responded to the call to participate in the study. These participants were recruited from six different …

Will Brazil's Belo Monte Dam Get The Green Light?, Inter-American Dialogue's Latin American Energy Advisor

Latin American Energy Dialogue, White Papers and Reports

A Brazilian federal appeals court on Aug. 14 ordered a halt to construction on the controversial Belo Monte dam until indigenous groups are properly consulted, The Guardian reported. However, on Monday, the Supreme Court issued a preliminary ruling that allowed for work on the project to resume. How significant is the charge that the consultation process was not properly followed? Will local groups be able to reach an agreement with developers and the government, which argue that the project is necessary to meet the country's growing energy demand? How could the consultation processes be improved to avoid similar conflicts both …

Numerical Analysis Of Plastic Deformation In Metal-Ceramic Nanolayers During Cyclic Indentation, Caroline Bolton Blada

Mechanical Engineering ETDs

The indentation behavior of metal/ceramic nanolayered composites is studied nu- merically using the finite element method. Attention is devoted to cyclic response under fixed maximum and minimum loads, with the primary objective of examining the evolving plastic deformation in the ductile metal constrained by the hard ceramic layers. An axisymmetric model consisting of alternating aluminum (Al) and silicon carbide (SiC) thin films on a silicon (Si) substrate is indented by a conical diamond indenter. In this study, both rate-independent and rate-dependent plasticity models are considered. It is found that, in the multilayered material plastic deformation in the Al layers continues …

Oblique Shock Interactions With Gas Cylinder Interfaces, Ross White

Mechanical Engineering ETDs

This thesis presents an experimental study of fluid instabilities formed due to an oblique interatction of a shock wave with a cylindrical gas column seeded with glycol droplets. Two gases are injected into quiescent air to form the column. The first is sulfur hexafluoride (SF6) which generates the well-known Richtmyer-Meshkov Instability (RMI) when impulsively accelerated by a shock wave. This instability is formed due to the misalignment of the pressure and density gradients during the acceleration phase. The second is air. In this case, there is no macroscopic density gradient between the gas column and the surrounding air. Nonetheless, an …

Sensitivity Study Of Turbulent Flow Simulations Over A Rotating Disk, Michael Snider

Mechanical Engineering ETDs

With increasing demand for renewable energy, there is a need for accurate and reliable simulations of a flow around a wind turbine. To be of use as an engineering design and planning tool, such simulations should be conducted in a timely manner. This can be achieved if a flow is modeled with Reynolds-Averaged Navier-Stokes turbulence models. To reduce uncertainties associated with numerical simulations from the simulation results, one has to ensure the convergence of results with respect to various simulation parameters. In this paper, the effect of the size of computational domain, boundary proximity, grid stretching, and initial grid wall …