Digital Commons Network^™

Finite Element Analysis Of Pin Positioning In Lapidus Procedure For Treating Hallux Valgus, Haritha Royyuru

UNLV Retrospective Theses & Dissertations

A finite element analysis is carried out to find the optimum position of the pin placement of mini fixator in Lapidus procedure in the treatment of Hallux Valgus. Various parameters are considered for analysis like diameter of the pin, positioning of the pin from the fracture site, number of pins effecting the stability of the fixation device and fusion site, rail distance from the fusion site, effect of width and length of the rail, effect of fusion angle and effect of pin angle positioning in fusion the joint by using FEMLAB 2.3 for both modeling and analysis. A 2D model …

Task 1: Geodetic Monitoring Of The Yucca Mountain Region Using Continuous Global Positioning System Measurements, Jonathan Price

Publications (YM)

The principal purpose of the cooperative agreement is to develop and continue providing the public and the Yucca Mountain Site Characterization Office (YMSCO) with an independently derived, unbiased body of scientific and engineering data concerning the study of Yucca Mountain as a potential high level waste repository. Under this agreement, the University and Community College System of Nevada (UCCSN) will perform scientific or engineering research, and develop and foster collaborative working relationships between the Government and academic researchers. The following describes the objectives of Task 1 “Geodetic Monitoring of the Yucca Mountain Region Using Continuous Global Positioning System Measurements” under …

Design And Analysis Of A Process For Melt Casting Metallic Fuel Pins Incorporating Volatile Actinides, Yitung Chen, Darrell Pepper, Randy Clarksean

Fuels Campaign (TRP)

The goal of this project is to investigate the casting processes for metallic fuels to help design a process that minimizes the loss of the volatile actinide elements from the fuel.

The research effort centers on the development of advanced numerical models to assess conditions that significantly impact the transport of volatile actinides during the melt casting process and represents a joint effort between researchers at the University of Nevada, Las Vegas (UNLV) and Argonne National Laboratory (ANL).

Design And Evaluation Of Processes For Fuel Fabrication, Georg F. Mauer

Fuels Campaign (TRP)

The goal of this research project is to provide technical support to process designers working on the development of the fuel cycles for transmutation applications. Detailed process models are developed to better define the impact of fuel choice on the transmuter fuel cycle, including relative process losses, waste generation, and plant capital cost. These process models provide insight regarding required plant size and number of plants needed to mesh with the fuel recycling line. They also determine requirements for automation.

Manufacturing models for large-scale production in a hot cell environment are also developed. Combined, these two models allow the assessment …

Design And Evaluation Of Processes For Transmuter Fuel Fabrication, Georg F. Mauer

Fuels Campaign (TRP)

• Project Objective: examine autonomous robotic fuel fabrication processes with regard to hot cell and equipment design, operations, and costs.

• Fabrication processes for different fuel types differ in terms of equipment types, throughput, and cost.

• Design options are restricted by the requirement to employ only radiation-hardened machinery and components

• Benefit to Department of Energy: decision support for the selection of the most suitable manufacturing process.

Helping Outstanding Pupils Educationally: Public Policy Issues Of The Georgia Hope Scholarship Program And The Lottery For Education, Ross Rubenstein

Center for Policy Research

The HOPE (Helping Outstanding Pupils Educationally_ scholarship program, which began in 1993, is one of the most popular public policies ever enacted in the state of Georgia. This lottery-funded program pays for tuition, fees, and books at any public college or university in the state for any Georgia student who graduates from high school with a B or better grade point average (GPA). To keep the scholarship, students must maintain the B or better GPA in college. The program's popularity has spread well beyond Georgia's borders; at least a dozen other states have instituted similar broad-based merit scholarship programs, and …

On The Measurment Of Job Risk In Hedonic Wage Models, Dan Black, Thomas J. Kniesner

Center for Policy Research

We examine the incidence, form, and research consequences of measurement error in measure of fatal injury risk in United States workplaces using both BLS and NIOSH data. We find evidence of substantial measurement errors in the fatality risk researchers attach to individual workers when estimating the implicit price of risk and the value of a statistical life. We first examine possible classical attenuation bias in the fatality risk coefficient. However, because we also find non-classical measurement error that differs across multiple risk measures and is not independent of other regressors, more complex statistical procedures than a standard instrumental variables estimator …

The Biomechanical Aspects Of Pedestrian Protection, Krishnakanth Aekbote, Peter Schuster, Sunny Kankanala, Srini Sundararajan, Stephen W. Rouhana

Mechanical Engineering

In this paper a biomechanical basis for pedestrian protection is presented based on reviews of epidemiological and biomechanical studies conducted over the last three decades. Epidemiological studies reveal the nature and cause of pedestrian crashes and injuries sustained in the field. The various factors that influence pedestrian crashes and fatalities such as pedestrian demographics, time and location of crash, type of vehicles involved and their design characteristics, impact speeds, and nature and severity of injuries sustained are covered in the epidemiology section. The biomechanical studies identify the injury mechanisms and the biomechanical tolerances. Several biomechanical studies that attempt to identify …

Building Research Skills: Course-Integrated Training Methods, Adriana Popescu, Radu Popescu

Library Scholarship

An enriched syllabus has been experimentally introduced to undergraduate level students enrolled in a geotechnical engineering course. Two research assignments have been integrated in the course, which require students to find information on a geotechnical engineering topic using both print and electronic resources available at the university library and on the Internet. Aiming to foster the development of technical information literacy and communication skills, the students are required to prepare a report based on a specific set of guidelines, followed by oral presentations of the topics researched. Between the two assignments, a lecture on the subject of identifying and using …

Global Changes In Scholarly Communication, Suzanne E. Thorin

Librarian Publications

For more than a decade, the cost of print and electronic journals, particularly in the sciences, has increased rapidly at the same time that the amount of research being reported via published articles has grown exponentially. With academic libraries being less and less able to purchase the journals needed for their communities, the use of the term scholarly communication has evolved to illustrate the breakdown of the process of traditional scholarly publication; that is, as a means to disseminate research results, the present system of scholarly communication can no longer meet the needs of the scholarly community at large.

When …

Coloring Graphs With Crossings, Wei Zhao

Honors Capstones

No abstract provided.

Chronic Wasting Disease In Deer And Elk: A Critique Of Current Models And Their Application, Eric M. Schauber, Alan Woolf

Publications

Chronic wasting disease (CWD), a fatal transmissible spongiform encephalopathy of deer (Odocoileus spp.) and elk (Cervus elaphus), presents a challenge to wildlife managers because little is known about its transmission, yet it could severely threaten wildlife populations if action is not taken rapidly. Published mathematical models predict that CWD could devastate populations of free-living deer and elk, prompting wildlife managers to attempt large-scale eradication of deer in hopes of containing CWD outbreaks. Our objective is to critically examine the theoretical and empirical support for current models of CWD epizootiology, in light of herd health-management actions. We identify …

Thermomechanical Behavior Of Rotor With Rubbing, Jerzy T. Sawicki, Alberto Montilla-Bravo, Zdzislaw Gosiewski

Mechanical Engineering Faculty Publications

This article presents an analytical study of the dynamics and stability of rotors subjected to rubbing due to contact with seals, taking account of associated thermal effects. The seal interaction force acting on the shaft gives rise to a friction force, which is a source of heating and can induce so-called spiral vibrations. A mathematical model that has been developed couples the heat-conduction equation with the equations for motion of the rotor. Numerical simulations have been conducted that show the thermomechanical behavior of the rotor at various operating conditions. A procedure for analyzing the stability of multibearing rotors based on …

2003-2004 Southern Illinois University Bulletin Carbondale Campus (Undergraduate Catalog), Southern Illinois University Carbondale

SIU Bulletins and Course Catalogs Archives

No abstract provided.

Policy Corner

Ethnobotanical Leaflets

Past Policy Corner

Catalog 2003-04, Dmacc

Catalogs

No abstract provided.

Alternate Input-Output Matrix Updating Formulations, Randall Jackson, Alan T. Murray

Regional Research Institute Working Papers

There has been a recent resurgence of interest in biproportional adjustment methods for updating and interpreting change in matrix representations of regional structures, most commonly input-output accounts. Although the biproportional method, commonly called the RAS technique in the input-output literature, has been shown to have a number of theoretically appealing properties, various alternatives do exist. In this paper, we develop and assess empirically a number of alternatives, comparing performance and examining attributes of these adjustment methods. Two of these are sign-preserving updating methods for use when tables contain both positive and negative entries. One of these is shown to generate …

Economics Of Natural Disasters: A Critical Review, Yasuhide Okuyama

Regional Research Institute Working Papers

Significant progress has been made in recent years for modeling spatial economic impacts of disasters in a regional context (for example, Okuyama and Chang eds. Modeling the Spatial Economic Impacts of Disasters, forthcoming). While these advancements are more toward modeling strategies based on conventional frameworks, little has been dealt with the theory on economics of disasters, since the pioneering work by Dacy and Kunreuther (The Economics of Natural Disasters, 1969). In this paper, “The Economics of Natural Disasters” is reviewed and updated for providing a theoretical perspective toward disaster related research. The review is carried our through restructuring the framework …

Movement And Spatial Population Structure Of A Prairie Planthopper, James T. Cronin

Faculty Publications

The transfer of organisms among patches is a key process influencing the spatial structure and regional dynamics of a population; yet, detailed experimental studies of animal movement among patches are uncommon. I performed a series of mark-recapture studies to quantify the movement of a planthopper, Prokelisia crocea (Hemiptera: Delphacidae), among discrete patches of its host plant, prairie cordgrass (Spartina pectinata). Results from these dispersal studies were used to predict the natural distributions and to characterize the spatial population structure of P. crocea. Planthopper emigration loss per patch increased linearly with the density of female conspecifics and was nonlinearly related to …

A Representation Theorem For Recovering Contraction Relations Satisfying Wci, Zhaohui Zhu, Bin Li, Xi'an Xiao, Shifu Chen, Wujia Zhu

Faculty Publications

A notion of an image structure associated with the canonical epistemic state is introduced. Based on it, we get a representation result for recovering contraction inference relations satisfying the condition weak conjunctive inclusion (wci) in terms of F-standard epistemic AGM states. In effect, this result establishes a representation theorem for belief contraction functions satisfying AGM postulates (k-1) - (k-7), and Rott's (wci) and (k-8c), and hence generalizes Rott's corresponding result in the finite framework. © 2002 Elsevier Science B.V. All rights reserved.

Packing Cycles In Graphs, Ii, Guoli Ding, Zhenzhen Xu, Wenan Zang

Faculty Publications

A graph G packs if for every induced subgraph H of G, the maximum number of vertex-disjoint cycles in H is equal to the minimum number of vertices whose deletion from H results in a forest. The purpose of this paper is to characterize all graphs that pack. © 2002 Elsevier Science (USA). All rights reserved.

Multiplicative Renormalization And Generating Functions I, Nobuhiro Asai, Izumi Kubo, Hui Hsiung Kuo

Faculty Publications

Let μ be a probability measure on the real line with finite moments of all orders. Apply the Gram-Schmidt orthogonalization process to the system {1, x, x2, . . ., xn, . . .} to get orthogonal polynomials Pn(x), n ≥ 0, which have leading coefficient 1 and satisfy (x-αn)Pn(x) = Pn+1(x) +ωnPn-1(x). In general it is almost impossible to use this process to compute the explicit form of these polynomials. In this paper we use the multiplicative renormalization to develop a new method for deriving generating functions for a large class of probability measures. From a generating function for …

Optimization Of Resonances In Photonic Crystal Slabs, Robert P. Lipton, Stephen P. Shipman, Stephanos Venakides

Faculty Publications

Variational methods are applied to the design of a two-dimensional lossless photonic crystal slab to optimize resonant scattering phenomena. The method is based on varying properties of the transmission coefficient that are connected to resonant behavior. Numerical studies are based on boundary-integral methods for crystals consisting of multiple scatterers. We present an example in which we modify a photonic crystal consisting of an array of dielectric rods in air so that a weak transmission anomaly is transformed into a sharp resonance.

Design-Dependent Loads In Topology Optimization, Blaise Bourdin, Antonin Chambolle

Faculty Publications

We present, analyze, and implement a new method for the design of the stiffest structure subject to a pressure load or a given field of internal forces. Our structure is represented as a subset S of a reference domain, and the complement of S is made of two other “phases”, the “void” and a fictitious “liquid” that exerts a pressure force on its interface with the solid structure. The problem we consider is to minimize the compliance of the structure S, which is the total work of the pressure and internal forces at the equilibrium displacement. In order to prevent …

Book Reviews

1650-1850: Ideas, Aesthetics, and Inquiries in the Early Modern Era

No abstract provided.

Ebenezer Sibley And The Royal Ark Masons, Susan M. Sommers

1650-1850: Ideas, Aesthetics, and Inquiries in the Early Modern Era

No abstract provided.

Aesthetics Of Coldness The Romantic Scene And A Glimpse At Baudelaire, Jurgen Klein

1650-1850: Ideas, Aesthetics, and Inquiries in the Early Modern Era

No abstract provided.

Decoherence In A Driven Three-Level System, A. R.P. Rau, Weichang Zhao

Faculty Publications

Dissipation and decoherence, and the evolution from pure to mixed states in quantum physics, are handled through master equations for the density matrix. Master equations such as the Lindblad equation preserve the trace of this matrix. Viewing them as first-order time-dependent operator equations for the elements of the density matrix, a unitary integration procedure can be adapted to solve for these elements. A simple model for decoherence preserves the Hermiticity of the density matrix. A single, classical Riccati equation is the only one requiring numerical handling to obtain a full solution of the quantum evolution. The procedure is general, valid …

Detectability Of Gravitational Waves From Sn 1987a, Giovanni Santostasi, Warren Johnson, Juhan Frank

Faculty Publications

We discuss the potential for the detection of gravitational waves from a rapidly spinning neutron star produced by supernova (SN) 1987A, taking the parameters claimed by Middleditch et al. at face value. Assuming that the dominant mechanism for spin-down is gravitational waves emitted by a freely precessing neutron star, it is possible to constrain the wobble angle, the effective moment of inertia of the precessing crust, and the crust cracking stress limit. Our analysis suggests that if the interpretation of the Middleditch data is correct, the compact remnant of SN 1987A may well provide a predictable source of gravitational waves …

The Expansion Of Punitive Damages In Minnesota: Environmental Litigation After Jensen V. Walsh , Alexandra B. Klass

William Mitchell Law Review

This article explains how the law of punitive damages has developed in Minnesota both before and after Jensen, and illustrates the significance of the Jensen case through a detailed discussion of the facts and outcome of the Kennedy Building Associates case. Section II of this article discusses the purpose of punitive damages, the process in Minnesota by which a punitive damages claim may be added to a case, and the circumstances under which punitive damages may be awarded. Section III of this article discusses the role of the courts in reviewing a jury's award of punitive damages in light of …