Digital Commons Network^™

Petri Net Modeling And Performance Analysis Of Can Fieldbus, Ji-Qiong Zhou

Theses

The CAN FB (Controller Area Network FieldBus) has been in existence for ten years. It supports automated manufacturing and process control environments to interconnect intelligent devices such as valves, sensors, and actuators. CAN FieldBus has a high bit rate and the ability to detect errors. It is immune to noise and resistant to shock, vibration, and heat. Two recently introduced mechanisms, Distributed Priority Queue (DPQ) and Priority Promotion (PP) enable CAN FieldBus networks to share out the system bandwidth and grant ail upper bound on the transmission times so as to meet the requirements in real-time communications. Modeling and analysis …

Design, Fabrication And Characterization Of Silicon Microlenses For Ir-Ccd Image Sensors, Dhiren Pattnaik

Theses

There is a growing trend in the study of Focal Plane Arrays(FPAs) of very small microlenses, used for a wide variety of imaging and sensing applications, to increase optical efficiency. Present day sensor technology might take a different direction altogether with the development of compact, high quality, high resolution imaging microlenses, which could make the fill factor >90%. A method to increase light sensitivity of Interline Transfer(IT) type image sensors is to position microlens FPAs on top of the image sensors. FPAs are structures of small lenses which focus the incoming light on the photo sensitive part of the image …

In-Situ Raman Spectroscopic Study Of The Oxidation And Reduction Of Ag Electrode In Na2So4, Yan-Xia Chen, Kai-Qi Huang, Zhong-Qun Tian

Journal of Electrochemistry

In-situ Raman spectroscopy combined with cyclic voltammogram measurements was used to investigate formation of oxygen species at Ag electrode surfaces during the oxidation and reduction process in 0.1 mol/L Na₂SO₄ solution. The time dependent Raman spectra show that at potentials positive of 0.2 V, adsorption of oxygen atom occurs, while at the potentials positive of 0.4 V, some oxygen atoms migrate into subsurface of the Ag electrode and the other form strongly bound oxygen on the surface through chemical bond. At the same potentials, part of the silver atoms are oxidized and form Ag₂SO_{4 …}

Molecular Inclusion Of Cyclodextrin Polymer And Its Application To Enzyme Electrodes, Hui-Huang Wu, Bao-Zhang Wu

Journal of Electrochemistry

The inclusion complexation of α-cyclodextin prepolymer host with benzoquinone guest was studied by voltametry. The spectroscopic measurements show that the polycondensation of CD with glutaric dialdehyde forms the polymer (PCD) with pending carbonyl, the latter brings about covalent immobilisation of glucose oxidase (GOD) to polymer chains. Owing to the inclusion complexation of CD, the benzoquinone(BQ) as mediator of GOD can be collected in the enzyme-containing PCD membrane, resulting in high concentration of BQ in the membrane while decreasing its amount in solution. TTF was tested to prepare the immobilised enzyme together with mediator in PCD. The enzyme loading in PCD …

Advanced Fenestration And Daylighting Systems, Florida Solar Energy Center, Ross Mccluney

FSEC Energy Research Center®

Advanced fenestration and daylighting systems form an interesting new class of devices and products for introducing natural lighting (daylight illumination) into buildings. They are split into two distinct classes. Advanced fenestration systems are new high-performance glazing and reflecting systems for otherwise conventional windows which offer specialized spectral and/or angular selectivity, intended for improved illumination quantity and quality while managing solar radiant heat gain to meet both human comfort and energy conservation objectives. These spectral and/or angular selectivities can be built into the glazings, incorporated into new objects placed between the panes, or they can be part of objects attached to …

Iron Phosphate Compositions For Containment Of Hazardous Metal Waste, D. E. Day

Materials Science and Engineering Faculty Research & Creative Works

An improved iron phosphate waste form for the vitrification, containment and long-term disposition of hazardous metal waste such as radioactive nuclear waste is provided. The waste form comprises a rigid iron phosphate matrix resulting from the cooling of a melt formed by heating a batch mixture comprising the metal waste and a matrix-forming component. The waste form comprises from about 30 to about 70 weight percent P205 and from about 25 to about 50 weight percent iron oxide and has metals present in the metal waste chemically dissolved therein. The concentration of iron oxide in the waste form along with …

1998 - The Third Annual Symposium Of Student Scholars

Symposium of Student Scholars Program Books

The full program book from the Third Annual Symposium of Student Scholars, held on May 8th, 1998. Includes abstracts from the presentation and posters.

Intelligent Transportation Systems Strategic Plan (Phase I Report), Joseph D. Crabtree, Ted H. Grossardt, Donald G. Hartman, Jerry G. Pigman, Jennifer R. Walton, Joel M. Weber, Study Advisory Committee

Kentucky Transportation Center Research Report

This interim report on an Intelligent Transportation Systems Strategic (ITS) Plan has been developed as documentation of the process of offering a vision for ITS and recommending an outline for organizational structure, infrastructure, and long-term planning for ITS in Kentucky. This plan provides an overview of the broad scope of ITS and relationships between various Intelligent Vehicle Highway Systems (IVHS) functional areas and ITS user service areas. Three of the functional areas of ITS have been addressed in this interim report with sections devoted to mission, vision, goals, and potential technology applications. Within each of the three areas, recommendations have …

Parameter Estimation Using Artificial Neural Network And Genetic Algorithm For Free-Product Migration And Recovery, J. Morshed, Jagath J. Kaluarachchi

Civil and Environmental Engineering Faculty Publications

Artificial neural network (ANN) is considered to be a universal function approximator, and genetic algorithm (GA) is considered to be a robust optimization technique. As such, ANN regression analysis and ANN-GA optimization techniques can be used to perform inverse groundwater modeling for parameter estimation. In this manuscript the applicability of these two techniques in solving an inverse problem related to a light-hydrocarbon-contaminated site is assessed. The critical parameters to be evaluated are grain-size distribution index α and saturated hydraulic conductivity of water Ksw, since these parameters control free-product volume predictions and flow. A set of published data corresponding to a …

Adaptation Space: Surviving Non-Maskable Failures, Crispin Cowan, Lois Delcambre, Anne-Francoise Le Meur, Ling Liu, David Maier, Dylan Mcnamee, Michael Miller, Calton Pu, Perry Wagle, Jonathan Walpole

Computer Science Faculty Publications and Presentations

Some failures cannot be masked by redundancies, because an unanticipated situation occurred, because fault-tolerance measures were not adequate, or because there was a security breach (which is not amenable to replication). Applications that wish to continue to offer some service despite nonmaskable failure must adapt to the loss of resources. When numerous combinations of non-maskable failure modes are considered, the set of possible adaptations becomes complex. This paper presents adaptation spaces, a formalism for navigating among combinations of adaptations. An adaptation space describes a collection of possible adaptations of a software component or system, and provides a uniform way of …

Bs News

Building Services Engineering

No abstract provided.

Impedance Of A Dipole Antenna In Ionospheric Plasma, Pavel Nikitin

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Different approaches to evaluating the behavior of the impedance of an electrically short dipole antenna in the ionosphere as a function of the driving frequency are discussed. The induced EMF method in quasi-static approximation is chosen for evaluating the impedance and explained in great detail. The E-region of the ionosphere is considered and the cold collisional plasma model is used.

The influence of a density gradient in plasma on the impedance is explored, and the possible current distributions on the surface of the antenna are considered, including the current distribution for the antenna with a gap. The conclusions are drawn …

Reducing Machine Downtime Through Improved Material Flow, Robyn Hoenle, Walter Teamer, Steve Toner

Honors Theses

The goal of a local manufacturer of garment and craft patterns is to maximize its profits. To achieve this goal, several processes within the plant must work efficiently independently and in conjunction with each other. In doing so, some of the issues that must be addressed include maximizing efficiency, reducing downtime, simplifying process layouts, and combining processes to ultimately provide a quality product to the customer. The manufacturer is presently experiencing excessive downtime in the packaging area because of excessive material handling. The task of the project team was to work in conjunction with the manufacturer to analyze and evaluate …

Spring 1998, Wmpg 90.9 Fm

WMPG Program Guides

WMPG program guide for Spring 1998

Includes notes from Program Director, information on shows and events, and schedule.

22nd Conference On Senior Engineering Design Projects, College Of Engineering And Applied Sciences

Senior Engineering Design Conference

The 22nd Conference on Senior Engineering Design Projects was held on April 14, 1998 at the College of Engineering and applied Sciences on the Parkview Campus of Western Michigan University. The college sponsors the conference to showcase the work of its graduating seniors, who are required to complete a capstone project that puts into practice what they have learned. Many of the projects are sponsored by business and industry.

Hermite–Sinusoidal-Gaussian Beams In Complex Optical Systems, Lee W. Casperson, Anthony A. Tovar

Electrical and Computer Engineering Faculty Publications and Presentations

Sinusoidal-Gaussian beams have recently been obtained as exact solutions of the paraxial wave equation for propagation in complex optical systems. Another useful set of beam solutions for Cartesian coordinate systems is based on Hermite–Gaussian functions. A generalization of these solution sets is developed here. The new solutions are referred to as Hermite–sinusoidal-Gaussian beams, because they are in the form of a product of Hermite-polynomial functions of either complex or real argument, sinusoidal functions of complex argument, and Gaussian functions of complex argument. These beams are valid for propagation through systems that can be represented in terms of complex beam matrices, …

Material Evaluation By Pulsed Diode Laser Optoacoustics, Xiaodong Xu

Electrical & Computer Engineering Theses & Dissertations

Pulsed diode laser optoacoustic diagnostics were carried out to characterize solid sample materials. The apparatus developed is compact, portable, cost-effective and therefore very promising for both industrial as well as laboratory applications. To our knowledge, this is the first time that optoacoustic characterization and measurement have been performed with a diode laser. The method was successfully applied to measure the thickness of a multilayer structure non-intrusively. Internal cracks of the material were detected by this technique.

A theory for optoacoustic signal generation, propagation and detection is given. A numerical analysis technique is developed to solve for the expected signal. In …

Effective Recruiting Methods For Four-Year Baccalaureate Industrial Technology Programs, Steven C. Spicher

Graduate Research Papers

The purpose of this study was to identify recruiting methods that might be utilized to increase student enrollment in four-year baccalaureate industrial technology programs in Iowa. The recruiting methods identified as effective may be used to increase the number of students enrolled in and graduating from four-year baccalaureate industrial technology programs in Iowa and surrounding states.

Ellipsometric Determination Of Optical Constants For Silicon And Thermally Grown Silicon Dioxide Via A Multi-Sample, Multi-Wavelength, Multi-Angle Investigation, C. M. Herzinger, B. Johs, W. A. Mcgahan, John A. Woollam, W. Paulson

Department of Electrical and Computer Engineering: Faculty Publications

Optical constant spectra for silicon and thermally grown silicon dioxide have been simultaneously determined using variable angle of incidence spectroscopic ellipsometry from 0.75 to 6.5 eV. Spectroscopic ellipsometric data sets acquired at multiple angles of incidence from seven samples with oxide thicknesses from 2 to 350 nm were analyzed using a self-contained multi-sample technique to obtain Kramers–Kronig consistent optical constant spectra. The investigation used a systematic approach utilizing optical models of increasing complexity in order to investigate the need for fitting the thermal SiO₂ optical constants and including an interface layer between the silicon and SiO₂ in modeling …

Nebraska Tractor Test Useumcommittee Minutes March 10, 1998, Tractor Museum

Lester F. Larsen Tractor Museum: Planning and Development Documents

Hitchcock Foundation Big Red Collectors Dedication of Museum

Radiation Damping Of Soil - Foundations Interaction Systems, Yang Xianjian, Jiang Bei

International Conference on Case Histories in Geotechnical Engineering

Based on the theory of wave scatter and the velocity, the wave radiation which is caused in soil of dynamic foundation and the range of the affected depth are presented in this paper. It is pointed out that the mass ratio of foundation and the location of the foundation in the layered soil, and its propagation velocity in the affected depth, are the major factors affecting radial damping of soil-foundation system on the half space.

Soil Dilation And Shear Deformations During Liquefaction, Ahmed-W. Elgamal, Ricardo Dobry, Ender Parra, Zhaohui Yang

International Conference on Case Histories in Geotechnical Engineering

Recent records of seismic site response have documented a salient liquefaction-induced cyclic shear-deformation mechanism. During liquefaction, these ground acceleration records have suggested a possible strong influence of soil-skeleton dilation at large cyclic shear strain excursions. Such phases of dilation can result in significant regain in shear stiffness and strength, leading to: i) associated instances of pore-pressure reduction. ii) appearance of spikes in lateral acceleration records (as a direct consequence of the increased shear resistance), and iii) a strong restraining effect on the magnitude of cyclic and accumulated permanent shear strains. As presented in this study, these response effects are also …

Shoring Analysis, Design And Construction At The Seattle Symphony's Benaroya Hall, Carole L.B. Mitchell, Monique A. Nykamp

International Conference on Case Histories in Geotechnical Engineering

Complex loading and geometry conditions controlled the design of the shoring wall system at Benaroya Hall, the new home of the Seattle Symphony. A combined system, including three soldier pile and tieback walls and one soil nail wall, was used to shore an excavation that ranged from 15 to 50 feet deep. A 25-foot-wide block of soil remained between the soil nail wall face and an existing, underground bus station. Prior to designing the soil nail wall, a finite difference analysis was performed to determine potential movements of the station due to the excavation. The deflection estimates from the finite …

Stability And Permeability Of Fluid Retention Berms Constructed From Highly Weathered Bedrock, Paul Michael Santi

International Conference on Case Histories in Geotechnical Engineering

A geotechnical evaluation was conducted of thirteen emergency impoundment basins constructed to retain fluids from catastrophic tank failure at a petroleum facility. The berms creating the impoundments were constructed on bedrock, weathered bedrock, slope wash, and lightly compacted fill derived from weathered bedrock.

Site materials ranged from fractured rock, to clayey gravel, to gravelly sand. Consequently, standard geotechnical tests for strength and permeability were difficult to perform, and test results were not often representative of the entire range of properties at each basin. Therefore, a systematic method of testing or estimating strength and permeability ranges was established. In order of …

Field Experiments On Jute Soil Stabilisers, A. K. Gupta, O. P. Yadav, Jai Bhagwan

International Conference on Case Histories in Geotechnical Engineering

The Central Road Research Institute has been constantly working in the area of geotextiles since early 1980s. A number of laboratory studies on evaluation of geotextiles for their suitability for road application, as well as, actual field trials have been carried out by the Institute. Recently, a project was taken up for the development and promotion of jute based geotextiles for road applications. A number of field trials have been carried out using jute based geotextiles for various applications. The paper presents summary of field experiments carried out to improve the soil behavior, improvement in the stability of road side …

A Non Destructive Testing Program For A Group Of Jet Grouting Columns, G. Varosio

International Conference on Case Histories in Geotechnical Engineering

An extensive soil improvement program was developed for the Vultri Container Terminal, Italy, located on an Hydraulic Reclamation Fill. The Office and Warehouse Building, and the Light Tower foundations were supported by Jet Grouting Columns. A testing program was developed, including coring and nondestructive testing on the columns, to verify the as built conditions. Test results show the difficulties in evaluating Jet Grouting properties with a nondestructive approach, mainly related to the complex geometry of the columns. However, the analysis and the comparison of the wave records provided suggestions on the most effective testing procedures, and on the possibility of …

Research On Crack Depth Measurement In Concrete By Using Rayleigh Waves, Wei Xinjiang, Xia Tangdai

International Conference on Case Histories in Geotechnical Engineering

The possibility of crack depth measurement in concrete by using Rayleigh waves and the feasibility of measurement method are3 introduced in this paper. The principle of crack measurement in concrete by using in-plan Rayleigh waves and the measurement analysis method are studied by using finite clement method.

From The Past To The Future Of Landfill Engineering Through Case Histories, R. Kerry Rowe

International Conference on Case Histories in Geotechnical Engineering

The advances in landfill engineering are outlined based on a number of case histories illustrating past problems, hydraulic performance of clay liners, diffusive transport through liners, hydraulic containment and clogging of leachate collection systems. The importance of conventional geotechnical considerations (e.g. stability) will also be highlighted with reference to a number of cases. Finally, the recent advances in landfill operations are illustrated with respect to a modern landfill. It is concluded that, provided all key failure mechanisms are considered in the design, construction and operation of the facility, modern landfills should provide environmental protection both today and well into the …

Risk And Reliability In Geotechnical Engineering, Suzanne Lacasse, Farrokh Nadim

International Conference on Case Histories in Geotechnical Engineering

Statistics, reliability analyses and risk estimates can be very useful decision-making tools in geotechnical problems. Yet the methods are little used in practice. The offshore and mining industry are at the forefront for the use of these approaches, having encouraged their use and sponsored research that has enabled the methods to be well-documented and of proven usefulness in the study of alternatives for design and decision-making in face of uncertainties. The paper presents a few case studies in different areas of geotechnical engineering and discusses the results that would have been obtained without the use of the risk approach. Special …

Geotechnical Risk And Reliability From Theory To Practice, Lenka S. Timiovska

International Conference on Case Histories in Geotechnical Engineering

Indeterminate combined with evaluating the safety of existing lifeline systems are, large and here one would expect format risk and reliability techniques to have found their most urgent need. Besides, risk analysis has languished in safety practice, is only now beginning to appear in established safety programs in my country. It is of interest to explore the reasons why this has been so, and to point the way to the adaptations that are necessary if risk analysis is to assume its deserved role in life-line systems and related areas of geotechnical practice. This paper has proposed that geotechnical conditions are …