Engineering Commons^™

Diffusion In Inhomogeneous Polymer Membranes, Sameer Suresh Kasargod, Farhad Adib, Partho Neogi

Chemical and Biochemical Engineering Faculty Research & Creative Works

The dual mode sorption solubility isotherms assume, and in instances Zimm-Lundberg analysis of the solubilities show, that glassy polymers are heterogeneous and that the distribution of the solute in the polymer is also inhomogeneous. under some conditions, the heterogeneities cannot be represented as holes. a mathematical model describing diffusion in inhomogeneous polymer membranes is presented using Cahn and Hilliard's gradient theory. the fractional mass uptake is found to be proportional to the fourth root of time rather than the square root, predicted by Fickian diffusion. This type of diffusion is classified as pseudo-Fickian. the model is compared with one experimental …

Diagnostics And Analysis Of Incident And Vapor Shield Plasmas In Pladis I, An Iter Relevant Tokamak Disruption Simulator, Joseph Thomas Bradley Iii

Electrical and Computer Engineering ETDs

The International Thermonuclear Experimental Reactor program (ITER) is a world wide collaboration to design and build the first new large scale tokamak fusion reactor of the 21st century. Under certain operating conditions the highly energetic plasma contained within a tokamak can become unstable and result in a loss of magnetic confinement, allowing the plasma to strike the interior of the vacuum chamber and cause damage. This event is known as a disruption. Plasma Facing Component (PFC) materials protect the interior of the tokamak from damage in the event of a disruption. Complex scaling laws have been used to estimate the …

Process For The Formation Of Wear- And Scuff-Resistant Carbon Coatings, Gerard W. Malaczynski, Xiaohong Qiu, Joseph V. Mantese, Alaa A. Elmoursi, Aboud H. Hamdi, Blake P. Wood, Kevin C. Walter, Michael Nastasi

Department of Mechanical and Materials Engineering: Faculty Publications

A process for forming an adherent diamond-like carbon coating on a workpiece of suitable material such as an aluminum alloy is disclosed. The workpiece is successively immersed in different plasma atmospheres and subjected to short duration, high voltage, negative electrical potential pulses or constant negative electrical potentials or the like so as to clean the surface of oxygen atoms, implant carbon atoms into the surface of the alloy to form carbide com pounds while codepositing a carbonaceous layer on the surface, bombard and remove the carbonaceous layer, and to thereafter deposit a generally amorphous hydrogen-containing carbon layer on the surface …

Method Of Removing Carbon From Fly Ash, John Groppo, Steven M. Brooks

Center for Applied Energy Research Faculty Patents

An improved froth flotation method is provided for the removal and recovery of an ultra-fine constituent such as carbon from tailings such as fly ash. A flotation apparatus is utilized that preferably includes a slurry conditioning tank and a flotation cell. The method of the present invention comprises the improvement of utilizing a flotation reagent formulation comprising a mixture of fuel oil and petroleum sulfonate. The method broadly includes the steps of (1) producing a slurry, or solid suspension, of the material containing the constituent to be recovered by adding a preselected amount of water or other slurrying liquid; (2) …

Performance Analysis Of A Banyan Based Atm Switching Fabric With Packet Priority, Zhaohui Yan

Dissertations and Theses

Since the emergence of the Asynchronous Transfer Mode ( A TM ) concept, various switching architectures have been proposed. The multistage interconnection networks have been proposed for the switching architecture under the A TM environment. In this thesis, we propose a new model for the performance analysis of an A TM switching fabric based on single-buffered Banyan network. In this model, we use a three-state, i.e., "empty", "new" and "blocked" Markov chain model to describe the behavior of the buffer within a switching element. In addition to traditional statistical analysis including throughput and delay, we also examine the delay variation. …

Appendix: List Of Participants [1995], Kentukcy Transportation Center

Kentucky's Annual Forum on Transportation

No abstract provided.

Wrap-Up, Leon N. Larson

Kentucky's Annual Forum on Transportation

No abstract provided.

On The Horizon, David R. Bryant, John Leonard Carr, Tom Layman

Kentucky's Annual Forum on Transportation

No abstract provided.

Managing In Changing Times--Industry's Perspective, Dean Blake

Kentucky's Annual Forum on Transportation

No abstract provided.

Doing With Less, Paul E. Toussaint, Mike Hancock, Judith M. Mueller

Kentucky's Annual Forum on Transportation

No abstract provided.

Update From The Kentucky General Assembly, Hubert Collins

Kentucky's Annual Forum on Transportation

No abstract provided.

Other Perspectives On Transportation Funding, John A. Deacon, Stephen D. Rowland

Kentucky's Annual Forum on Transportation

No abstract provided.

Status Of Kentucky's Transportation Program, Don C. Kelly

Kentucky's Annual Forum on Transportation

No abstract provided.

The Future Of State Funding, Merl M. Hackbart, Glenn B. Mitchell, Sylvia L. Lovely

Kentucky's Annual Forum on Transportation

No abstract provided.

The Future Of Federal Funding, Harold Rogers, Steven O. Palmer

Kentucky's Annual Forum on Transportation

No abstract provided.

Welcome And Remarks [1995], Thomas W. Lester

Kentucky's Annual Forum on Transportation

No abstract provided.

Kentucky Transportation Hall Of Fame [1995], Kentucky Transportation Center

Kentucky's Annual Forum on Transportation

No abstract provided.

Shear Strength And Fatigue Crack Propagation In Concrete By Energy Method, Wei Wang

Dissertations

The limit analysis methods have been commonly used to predict the ultimate flexure strength of reinforced concrete members over 50 years. However, current design formulas for shear in structural concrete are mostly empirical. In part one of this dissertation, attempts are made to apply the theory of plasticity to predict the shear strengths of reinforced concrete structures.

The modified Coulomb-Mohr failure criterion is used as the constitutive law of concrete, and the plastic flow is assumed to be associated with this failure criterion. A generalized formulation for energy dissipation in accordance with the failure criterion and associated flow rule is …

A Nondestructive Method For The Determination Of Fracture Energy In Concrete Structures, Been-Jyh Yu

Dissertations

It is generally believed that linear elastic fracture mechanics concepts can not be employed in determining fracture parameters in concrete, and therefore most of the current research effort has focused on applying the principles in yielding fracture mechanics. Despite all these efforts, comparison of results reported by many investigators indicate wide variations in fracture toughness values even for essentially similar materials. The main source of discrepancy in the observed results is the existence of a large process zone at the crack tip. Hence, the amount of energy consumed in advancing the crack will depend on the size of the process …

Acuta Enews October 1995, Vol. 24, No. 10

ACUTA Newsletters

In This Issue

From the President

Disaster Recovery: Part ll

PBX Call Processing Basics

Cal State lnstalls Intelligent Payphones

From ACUTA Headquarters

Santa Clara Magazine, Volume 37 Number 4, Fall 1995, Santa Clara University

Santa Clara Magazine

8 - OF QUARKS, OBJECT IDENTIFICATION, AND PORPHYRIN MOLECULES SCU undergraduates get a taste of scientific research. By Miriam Schulman

14 - WHAT'S YOUR BOTTOM LINE? By investing in mutual funds that reflect their values, an increasing number of shareholders hope to put their money where their morals are. But can socially responsible investing really change the world? By Jeff Brazil ' 85

22 - A BIG ENOUGH UMBRELLA Tens of thousands of women from around the world gather for a unifying-albeit rainy- conference in China. Photographs By Kim Johnson ' 87

26 - THE ART OF MATHEMATICS For every …

The Evolution And Testing Of An Aerovalve Pulsejet Engine, Gregory V. Meholic

Master's Theses - Daytona Beach

The goal of this project was to develop and test a self-aspirating aerovalve pulsejet and measure its operating characteristics. An investigation of pulsejets developed by previous experimenters revealed design trends associated with the engine geometry. These trends were followed in the development of an aerovalve pulsejet engine entitled the Astra. The engine employed variable fuel injection methods, ignition location and exhaust pipe length to show that certain combinations of geometry relations and fuel injection methods were more conducive to pulse combustion. Even though the engine pulsed with forced inlet air, the Astra did not self-aspirate as did the engines …

Civilizing The Civil Engineer: How A History Course Can Serve As A Curriculum Capstone, John Alfred Heitmann

History Faculty Publications

Beginning in 1989 and then every other year thereafter, a unique course dealing specifically with the history of civil engineering has been taught to all civil engineering majors at the University of Dayton. What has evolved over time -- in response to student feedback, ongoing reform in the curriculum, and a maturing of faculty expertise -- is a course in the history of civilization that has as its major focus the discipline of civil engineering.

In reality, what happens in the classroom is a far broader learning experience than either the disciplines of history or civil engineering could provide standing …

The Characteristics Of Agile Manufacturing That Can Be Implemented In The Manufacture Of Agricultural Equipment, Irvin L. Wilhelms

Graduate Research Papers

The problem of this study was to determine the characteristics of agile manufacturing and their applicability to a manufacturer of heavy agricultural equipment.

A Computer-Aided Software Engineering (Case) Approach To Business Process Reengineering (Bpr), Faiza I. Khan

Master's Theses - Daytona Beach

This thesis addresses the problem of lack of procedures by which managers can identify business processes that would benefit from reengineering and which could be used to guide the BPR activity to its successful conclusion. The purpose of this study is to analyze various Software Engineering (SE) principles to determine whether they could be used to support Business Process Reengineering (BPR) activities either directly or with some modification, and if so, whether available Computer-Aided Software Engineering (CASE) tools might be applied to BPR in support of managers who wish to implement it. The principles of SE and BPR are discussed …

Bulletin - October, 1995, Civil Aviation Medical Association

Browse all Civil Aviation Medical Association Newsletters

A sixteen page newsletter of the Civil Aviation Medical Association. The newsletter provided news about civil aviation medicine and information related to the organization.

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, Volume 11, Number 8, October 1995, College Of Engineering And Computer Science, Wright State University

BITs and PCs Newsletter

A ten page newsletter created by the Wright State University College of Engineering and Computer Science that addresses the current affairs of the college.

Flexible Low-Cost Automated Scaled Highway (Flash) Laboratory For Studies On Automated Highway Systems, Pushkin Kachroo, Kaan Ozbay, Robert G. Leonard, Cem Unsal

Electrical & Computer Engineering Faculty Research

This paper addresses the development of a flexible low-cost automated scale highway (FLASH) laboratory which is intended to serve as a catalyst for accelerating the development of many intelligent vehicle highway system (IVHS) concepts. It also highlights the significance of the laboratory for the research, evaluation, and testing of automated highway system (AHS) configurations, architectures, designs and technologies. This laboratory, using small scale standardized vehicles will serve as a test bed for the economical development and evaluation of various hardware, software, and management systems before full scale testing and deployment. The laboratory will provide the capability to test day and …

A Characterization Of Alternative Tooling Materials Using Impact Abrasion Testing, Michael C. Formanek

Graduate Research Papers

The purpose of this study was to evaluate the wear resistance of tooling materials using impact abrasion testing. Materials tested are being used or are being considered for use in pattern and corebox construction. This study used 14 materials for evaluation. The materials were chosen on the basis of recommendations made by manufacturers and patterns shops. This study used the same procedure established in a study done in 1992 by Vondra to evaluate materials against a standard sample.

Of the materials tested three were included in the ceramics group. These materials demonstrated average wear resistance. The percent weight loss ranged …

Assessment Of High-Order Serendipity And Lagrangian Quadrilateral Membrane Elements, Timothy Scott Davis

Mechanical & Aerospace Engineering Theses & Dissertations

The development and implementation of high-order Lagrangian and serendipity quadrilateral elements including a biquartic Lagrangian element, a 16-node serendipity element, and a 17-node serendipity element are presented and assessed. This assessment includes an evaluation of the patch test, an element eigenvalue test to detect any zero-energy modes, and selected plane stress problems. The effects of using both full and reduced numerical integration procedures and optimum locations for stress recovery are discussed. All elements evaluated represent the three rigid-body modes without inducing strains, exhibit geometric isotropy, and pass the membrane patch test. The most promising high-order quadrilateral element proved to be …