Engineering Commons^™

Acuta Enews November 1991, Vol. 20, No. 11

ACUTA Newsletters

In This Issue

President's message

Distance learning in Maine

FCC backs phone-line video

Pooling purchasing power

Area code shortage

Positions available

Improved Efficiency In Semiconducting Polymer Light-Emitting Diodes, David Braun, A. J. Heeger, H. Kromer

Electrical Engineering

We report visible light emission from metal-polymer diodes made from semiconducting polymers, with indium-tin oxide as the “ohmic” contact, and a variety of metals as the barrier metal. Our results, which confirm the discovery by the Cambridge group [Nature347, 539 (1990)], demonstrate that light-emitting diodes can be fabricated by casting the polymer film on indium-tin oxide from solution with no subsequent polymer processing or heat treatment required. Electrical characterization reveals diode behavior with rectification ratios greater than 105 at sufficiently high voltages. Use of an electrode material with low work function leads to more than an order of magnitude improvement …

The Calendar - November 1991, Nova University

The Calendar

No abstract provided.

One-Tier Plastic-Covered Tobacco Curing Structure—Tier Rail Design, George A. Duncan

Agricultural Engineering Extension Publications

A tobacco grower occasionally has insufficient barn space to house his crop. This problem is especially severe when a barn is damaged or destroyed and cannot be repaired or replaced before harvest. Also, those leasing or having extra poundage may need short-term, low-cost housing.

Kentucky weather conditions are suited for curing in conventional barns as well as in other special structures with adequate covering and crop protection.

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, Volume 7, Number 8, November 1991, 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.

Field Performance Report On Corrugated Polyethylene Pipe, L. John Fleckenstein, David L. Allen

Kentucky Transportation Center Research Report

This report documents the installation and performance of corrugated smooth lined polyethylene pipe installed during construction of South Forbes Road in Fayette County, KY 54 in Daviess County, US 62 in McCracken County, Nicholasville Road in Fayette County, US 68/KY 80 in Warren County, KY 127 in Franklin County, US 62 in Hardin County, Donaldson Road and KY 236 in Kenton County, KY 17 in Kenton County, and Anderson Road in Kenton County. The majority of the pipe installed was N-12 pipe manufactured by Advanced Drainage Systems, Inc., and is designated as ADS N-12. ADS N-12 is a corrugated high-density …

Application Of Mixed H2/H∞ Optimization, John J. Kusnierek

Theses and Dissertations

A non-conservative optimization technique is utilized to examine the problem of minimizing the 2 norm of one transfer function subject to an ∞-norm bound on another transfer function. For single exogenous input/ single exogenous output systems this non conservative mixed solution is shown to be up to 5% better in a specific example. For single exogenous input/two exogenous output systems the mixed solution is shown to be up to 27% better than a previous technique for a specific example. Finally, a two exogenous input/two exogenous output practical system is examined to demonstrate the utility of this mixed optimization technique.

Application Of Low Thrust Propulsion Techniques To Satellite Attitude Control Systems, Jeffrey J. Abbott

Theses and Dissertations

Equation of motion for a satellite controlled through continuous, low thrust propulsion systems are analyzed through numerical integration techniques. The equations of motion are derived using the Euler Moment Equations. The properties of the satellite model are based upon the Intelsat VII design of communications satellite. A simple rate and error feedback controller is used in providing active attitude control about two and three axes. Perturbation models are created and applied based upon the satellite model. Parameters varied include thrust levels and controller deadband widths. System response times, pointing accuracy, and total impulse required for attitude control are determined as …

Comparative Analysis Of Guidance Algorithms For The Hyper Velocity Missile And Afti/F-16, Edward G. Rice

Theses and Dissertations

This project has provided me with endless intrigue. In considering the problem of guiding a hyper-velocity missile from a moving platform to a moving target, a common perception said it was just another Kalman Filtration design challenge. I began with lofty intentions of running a full up extended Kalman filter simulation but I became enthralled with the limited work available on the physical limitations of basic guidance algorithms. This became the emphasis of this project. The best filter scheme cannot overcome a guidance algorithms physical limitation. Only with an understanding of these limitations can one effectively integrate a guidance scheme …

Steady-State Production And Quenching Of Br(2P½), Ralph F. Tate

Theses and Dissertations

The spin orbit relaxation of atoms has been investigated in a steady state infrared fluorescence experiment. A CW argon ion laser operating at 488 nm was used to photodissociate gas-phase Br into equal quantities of Bromine and Bromine atoms. The resulting 2.7 µm emission was observed as a function of added quenching gas. A steady-state analysis was used to determine quenching rates for SF₆, N₂, O₂, He, Ne, Ar, Kr, and Xe, relative to quenching by the parent molecule. Limitations in the apparatus prevented determination of the quenching rate coefficient for Br₂. …

Sensitivity Study Of 1986 Aashto Guide For Design Of Pavement Structures, Herbert F. Southgate

Kentucky Transportation Center Research Report

A sensitivity study of 14 items added to the 1986 AASHTO Guide for Design of Pavement Structures indicated: (1) variations in percent reliability were most influential on the design EAL for the same pavement structure while (2) variations in standard deviations had minimal effects. (3) Resilient moduli for base and subbase materials are very dependent upon stress state (or bulk stress). (4) A method was developed to quantify the effect of drainage capabilities for various soils and its effect upon reduction in structural coefficients for base and subbase materials. (5) Literature review revealed 13 relationships to define soil stiffness. The …

Analysis Of Baseband Equivalent Noise In A First-Order Correlation Loop Utilizing Filtered Pseudonoise Signals, Kurt Louis Kosbar, Christopher J. Scholten

Electrical and Computer Engineering Faculty Research & Creative Works

Conventional direct-sequence and frequency-hopping spread spectrum systems utilize delay-lock loops to track the timing epoch of pseudonoise codes. These devices perform admirably at high signal-to-noise ratios (SNR), however, they are suboptimal at moderate and low SNR. A correlation loop that employs appropriately filtered pseudonoise signals for the local cross-correlation waveform may have superior performance under these conditions. The performance of this modified correlation loop will be determined by the cross correlation function of the transmitted waveform and locally generated reference signals, along with the statistics of the baseband equivalent noise process. In this work, we find the statistics of the …

Population Trends For Indiana Counties, Cities, And Towns 1970–1990, Herpicc

Indiana Local Technical Assistance Program (LTAP) Publications

This report presents tabulation and rankings that permit a direct comparison of population growth and population totals for city, town, and county units to assist officials in making amore comprehensive interpretation of the 1990 census figures.

Uniform System For Accident Reporting, Jorge A. Vanegas

Indiana Local Technical Assistance Program (LTAP) Publications

This report presents the results of Project 91-08 Task 5, Project 1, Part III: Uniform System for Accident Reporting.

Bs News

Building Services Engineering

No abstract provided.

Green's Law Revisited: Tidal Long-Wave Propagation In Channels With Strong Topography, David A. Jay

Civil and Environmental Engineering Faculty Publications and Presentations

Green's Law states that tidal long-wave elevation ζ and tidal transport Q vary with width b and depth h according to ζ ≌ b^−1/2h^−1/4 and Q ≌ b^+1/2h^+/4. This solution is of limited utility because it is restricted to inviscid, infinitesimal waves in channels with no mean flow and weak topography (those with topographic scale L ≫ wavelength λ). An analytical perturbation model including finite-amplitude effects, river flow, and tidal flats has been used to show that (1) wave behavior to lowest order is a function of only two nondimensional parameters representing, respectively, …

A Note On Repeated-Root Cyclic Codes, Robert H. Morelos-Zaragoza

Faculty Publications

In papers by Castagnoli et al. and Van Lint, cyclic codes with repeated roots are analyzed. Both papers fail to acknowledge a previous work by Chen, dating back to 1969, which includes an analysis of even, length binary cyclic codes. Results from Chen’s study are presented.

Integrated Anaerobic-Aerobic System For The Biodegradation Of Highly Chlorinated Aromatic Compounds, Cheng-Ming Kung

Dissertations

A two-step process was developed for the complete mineralization of hazardous chlorinated aromatic compounds. The system consisted of an anaerobic reactor, in which reductive dehalogenation took place, coupled with an aerobic reactor in which the complete mineralization of the products of the anaerobic dehalogenation occurred.

A mixed anaerobic culture from a municipal sewage treatment plant was enriched and then immobilized on silica-based porous beads to treat 2,4,6-trichlorophenol (TCP), which is the model target compound in this work. In the anaerobic reactor, TCP was degraded to 2,4-dichlorophenol which was, in turn, reduced to 4-chlorophenol (4-CP). Stoichiometric amounts of 4-CP were recovered …

Direct Recovering Of Surface Structure Characterized By An Nth Degree Polynomial Equation Using The Uoff Approach, Mazen A. Salhi

Theses

There are two different approaches for estimation of structure and/or motion of objects in the computer vision community today. One is the feature correspondence method, and the other is the optical flow method [1]. There are many difficulties and limitations encountered with the feature correspondence method, while the optical flow method is more feasible, but requires a substantial amount of extra calculations if the optical flow is to be computed as an intermediate step.

Direct methods have been developed [2-4], that use the optical flow approach, but avoid computing the full optical flow field as an intermediate step for recovering …

Canmol : Expert System In Medicine, Kulin Hemani

Theses

The intriguing words for the nineteen nineties are "Expert Systems", and "Artificial Intelligence". To a layman these terms conjure up thoughts of spaceships and futuristic beings. In reality they exemplify man's capability to harness technology.

Expert systems are computer software programs that make use of previously accumulated knowledge to assist in solving complex problems.

In recent years the practice of medicine has changed dramatically from a fundamentally individually deductive approach to an Artificial Intelligence based science. The modern physician no longer draws conclusions simply by examining the patient. Today the physician employs sophisticated computer based diagnostic tools to generate a …

Delay Performance Of Cebus And Modified Cebus Schemes, Altaf Hussain

Theses

In this thesis the performance of the CEBUS (Consumer Electronics Bus), a local area network proposed by the Electronics Industries Association for the 'Smart House,' is analyzed under varying network load and traffic patterns that would occur in a typical home environment. Reduced complexity versions of the CEBUS scheme are compared with the standard CEBUS scheme.

It was found from simulation analysis that the delay in the CEBUS network, at a given network bandwidth, is dependent upon the message priority and the traffic pattern in the network. It was also observed that the performance of a modified CEBUS scheme was …

Automation Of Part Inspection In A Coordinate Measuring Machine, Madhu N. Kanoor

Theses

Some of the drawbacks in inspecting a part using a Direct Computer Controlled Coordinate Measuring Machine are that a programmer has to generate a part program for the inspection process, and such programs have to be generated for each part to be inspected. These programs will be restricted to a kind of CMM, thus preventing the portability of the program t o other kinds of CMM.

If a part program can be generated off line after a part has been designed in a CAD system. an operator can inspect the part without any prior knowledge of the esoteric CMM programming …

Design Optimization Of Laminated Fiber Composites, Ramarao G. Prasad

Theses

Laminated Fiber Composites are finding a wide range of applications in structural design especially for light weight structures that have stringent stiffness and strength requirements Finding an efficient composite structural design that meets the requirements of a certain application can be achieved not only by sizing the cross-sectional areas and member thicknesses but also by global or local tailoring of the material properties through selective use of orientation, number and stacking sequence of the laminae that make up the composite laminate.

The work presented here treats the design optimization problem involving minimum weight design of fiber composite laminates subject to …

Development Of Technology For Glass Shaping By The Use Of Abrasive Water-Jet, Li-Yuan Shih

Theses

This study is to investigate the effects of AWJ properties on the results of glass machining and to develop a practical procedure for prediction of these results of abrasive waterjet (AWJ) machining. The use of glass in engineering and Abrasive Waterjet Cutting Technology are introduced. A practical technique to prevent defects and to improve the quality of the glass surface is suggested. A earlier parameter introduced, Exergy Distribution Density (EDD), is used in order to characterize the cutting conditions.

It was found that besides of EDD the results of machining are affected by the particles' destruction in the course of …

Broadband Isdn Control Using Neural Networks, Stavros Zervoudakis

Theses

Broadband Integrated Services Digital Networks (B-ISDN) are considered to become the standard communications networks in the near future. Major research efford is being applied in determining the appropriate mode of operation for B-ISDN systems. Two proposals, the Synchronous Transfer Mode (STM) and the Asynchronous Transfer Mode (ATM) claim to best fit the B-ISDN transmission requirements individually. A new method for B-ISDN traffic control is proposed in this paper. This method assigns priority levels to incoming traffic while integrating STM with ATM. A neural network is used to decide how the multiplexing of the incoming packets will be performed. Several traffic …

Disc Size Scale-Up In Rotating Biological Contactor System, Chi-Sheng Chang

Theses

Disc size scale-up of prototype and small-scale RBC plants are successfully developed by applying the 114 data sets obtained from 12 RBC plants to the evaluation of percent sBOD remaining. These data analyses are performed by the least square method, therefore, the scale-up factors of the prototype and the small-scale are determined at different hydraulic loading. Furthermore, the relationship between scale-up factor and the disc diameter are established under the given flow rate, the number of stages, and the number of discs. A group of Curves are obtained and can be utilized for the full-scale RBC plant preliminary design. The …

Calcium Channel Dynamics In Hippocampal Neurons : Simulation And Physiological Studies, Prasad D. Jasthi

Theses

Mathematical modelling and computer simulations of neurons was presented by various researchers in the past. Computer simulations provide a time efficient and cost effective method to obtain required information about the physiological system. The objective of this project is to study the kinetics of calcium channels in hippocampal neurons. In an attempt to study the calcium channel activity we have developed a mathematical model for the CA3 region of the hippocampus and have analysed the calcium current noise obtained from the physiological recordings. The Simulation results had reproduced the action potential and activities of sodium and potassium channels, but did …

Biodegradation Of Phenol And 4-Chlorophenol Using A Single Species In A Sequencing Batch Reactor, Kung-Wei Wang

Theses

Biodegradation of phenol and 4-chlorophenol (4CP) using Pseudomonas putida (ATCC 17514) was studied in batch and sequencing batch reactors. Batch experiments were first performed in order to reveal the kinetics of biodegradation for each substrate. 4-Chlorophenol was degradable only in the presence of phenol, or immediately after exposure of the organism to phenol. It was postulated that an enzyme induced by the presence of phenol was necessary to initiate degradation of 4-chlorophenol.

A mathematical model was then developed to describe the dynamic behavior of both substrates in a sequencing batch reactor (SBR). The model utilized rate parameters obtained from batch …

1991 Scholars And Artists Bibliography, Michael Schwartz Library, Cleveland State University, Friends Of The Michael Schwartz Library

Scholars and Artists Bibliographies

This bibliography was created for the annual Friends of the Michael Schwartz Library Scholars and Artists Reception, recognizing scholarly and creative achievements of Cleveland State University faculty, staff and emeriti

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, Volume 7, Number 7, October 1991, 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.