Engineering Commons^™

Performance Theorems For The Resource Scheduling Functions Of A Multiprocessing System, George Arthur Nicol

Dissertations and Theses

In this dissertation, a multiprocess scheduling model is developed and a set of performance theorems is constructed for the set of scheduling functions associated with the model. Each theorem describes the conditions under which a scheduling function exhibits a particular type of performance.

A Study Of The Effect Of Vibration On The Residual Stresses In A Welded Fabricated Tube, Shantini Ratnathicam

Dissertations and Theses

In many instances the predominant factor contributing to structural failure in welded parts is the residual stress which exists before the part is put into service. In this investigation an attempt is made to study the changes in residual stresses caused by vibrational stress relief (VSR). VSR is a fairly new idea in stress relief and there is no substantial evidence of its success in reducing residual stresses. This thesis documents the residual stress distributions found in 5/16 inch thick, 22 inch diameter welded fabricated tubes after VSR.

Test 1316: International Hydro 84 Utility / Row Crop Diesel, Nebraska Tractor Test Lab

Nebraska Tractor Tests

EXPLANATION OF THE TEST PROCEDURE

General

Tractors are tested at the University of Nebraska according to the Agricultural Tractor Test Code approved by the American Society of Agricultural Engineers and the Society of Automotive Engineers or official Nebraska test procedure.

The manufacturer selects the tractor to be tested and certifies that it is a stock model. Each tractor is equipped with the common power consuming accessories such as power steering, power lift pump, generator, etc., if available. Power consuming accessories may be disconnected only when the means for disconnecting can be reached from the operating station. An official representative of …

Stable Equilibrium Statistical States For Spheromaks, George Vahala, Linda L. Vahala

Electrical & Computer Engineering Faculty Publications

Incompressible nondissipative magnetohydrodynamic turbulence is treated for spherical systems. From the absolute equilibrium expectation values of the fields one can investigate those initially quiescent states for which no large mean square velocity will develop. This stable state is force-free and gives rise to the Hill vortex structure for the magnetic flux surfaces.

The Machinery Crisis, W T. Brown

Journal of the Department of Agriculture, Western Australia, Series 4

The machinery crisis - I believe we have come through a crisis in farming efficiency. To maintain his income, the farmer has had to reduce his costs of production, or increase production per man. He has done this by climbing to a new plateau of efficiency, and he expanded or got out; he has substituted capital for labour.

In many cases this means bigger, more powerful machinery. This is not a simple or easy move and there are many potential ways to mske the wrong decision.

How To Select A Tractor, W T. Brown

Journal of the Department of Agriculture, Western Australia, Series 4

A look at some of the factors to be considered when choosing a tractor for your farm. There is no one answer

Final Report On Project Feasibility : To Jacksonville Transportation Authority, November, 1979, Parsons Brinckerhoff, Flood &. Associates

Jacksonville and Duval Co. Miscellaneous

This report was prepared for the purpose of determining the feasibility of the DPM for the Jacksonville CBD. The gathering of data, the preparation of information, the research, the citizens' participation, the alternatives analysis, and the detailed planning were all done for the purpose of answering one basic question: Is a downtown people mover feasible for Jacksonville?

Molybdenum Stability In Coal Slags At 1400⁰C: Corrosion Properties For Mhd Electrode Applications., Kenton Brian Wright

Masters Theses

"Molten coal slag corrosion studies conducted on molybdenum at 1400°C used static and stirred slag experiments and electrical current experiments to parallel electrode conditions of slagging duct MHD generators. Crucibles containing molybdenum and slag were exposed to combustion-type gases in a tube furnace. Carbon monoxide-carbon dioxide gas mixtures controlled oxygen partial pressures at selected values between 10^-11 and 10^-3 atm. Metallograph and microprobe examination of polished sample sections defined corrosion characteristics.

At 1400°C, molybdenum metal is stable below 10^-9 atm oxygen pressure. Molybdenum dioxide is stable at higher pressure, but volatile molybdenum trioxides prevent formation of stable …

Processing Of Copper Refinery Anode Slimes, Shrirang Anant Kulkarni

Masters Theses

"A study of commercial copper refinery anode slimes has been conducted to evaluate the separation of valuable metals contained in the slimes. The slimes contain substantial quantities of Ag, Sn, Au, Pb, and Cu. The values were present principally as AgCl, SnO₂, Au, PbSO₄, Cu and CuSO₄.

A Roast-Leach-Roast-Leach (RLRL) technique solubilized up to 91 pct of the Ag and 99 pct of the Cu from raw slimes.

The Pb-Sn separation was investigated using the following hydrometallurgical techniques: 1) DETA (diethylene triamine) leaching; 2) NaOH leaching; 3) (NH₄)₂CO₃ leaching; …

Stress-Strain Properties Of Compacted Modified Memphis Loess, Danny Lloyd Kerns

Masters Theses

"A study was made of the stress-strain characteristics of compacted samples of a modified loessial soil obtained near Memphis, Tennessee. The study consisted of compacting samples at a constant water content and at unit weights of 92, 96 and 100 pounds per cubic foot (1470, 1540 and 1600 kg/m³). Triaxial tests were performed on unsaturated compacted specimens to obtain stress-strain-volume change data. These data were used to determine stress-dependent functions for tangent modulus and Poisson's ratio"--Abstract, page ii.

Analysis Of Hardened Concrete For Admixture Content : Interim Report, Larry Chester Muszynski

JTRP Technical Reports

No abstract provided.

Development And Use Of A Computer Simulation Model For The Evaluation Of Design And Control Alternatives For Intersections Of Minor Road With Multi-Lane Rural Highways: Selection Of Simulation Model: Interim Report, Ahmed Essam Radwan, Kumares C. Sinha, Harold L. Michael

JTRP Technical Reports

No abstract provided.

Evaluation And Development Of Synthetic Trip Distribution Modeling Techniques As Applied To Small Urban Areas : Interim Report, James Robert Mekemson, Kumares C. Sinha

JTRP Technical Reports

No abstract provided.

Methodology For Evaluating The Impacts Of Energy, National Economy, And Public Policies On State Highway Financing And Performance, Fred L. Mannering

JTRP Technical Reports

No abstract provided.

Superior Bluegrasses For Roadside Turf, William Hugh Daniel, R. P. Freeborg

JTRP Technical Reports

No abstract provided.

Traffic Speed Report No. 107 : Interim Report, James Robert Mekemson, George K. Stafford

JTRP Technical Reports

No abstract provided.

Development And Use Of A Computer Simulation Model For The Evaluation Of Design And Control Alternatives For Intersections Of Minor Road With Multi-Lane Rural Highways: Model Application: Interim Report, Ahmed Essam Radwan, Kumares C. Sinha, Harold L. Michael

JTRP Technical Reports

No abstract provided.

Relationship Of Highway Development And City Development For Non-Metropolitan Places In Indiana, Hadi Yamin

JTRP Technical Reports

No abstract provided.

Validation And Practical Application Of The Utcs-1s Network Simulation Model On An Urban Arterial Street : Interim Report, Bruce Allen Hillson

JTRP Technical Reports

No abstract provided.

Traffic Speed Report No. 109 : Interim Report, Richard Philip Guenthner, George K. Stafford

JTRP Technical Reports

No abstract provided.

The Development And Application Of A Standard Compaction-Degradation Test For Shales : Interim Report, Barney Conrad Hale

JTRP Technical Reports

No abstract provided.

Industrial Education In Scandinavia, Ronald Bro

Faculty Book Gallery

The Problem An investigation of curricular programs in industrial education in the public school and teacher education institutions of the Scandinavian countries. The emphasis was on contemporary curricula, program purposes, characteristics, and facilities.

Purpose of the Study Early forms of industrial education in the Scandinavian countries were influential in the origin and development of industrial education in the United States. Available literature contained little information about current systems of industrial education in Scandinavia. The purpose of this study, therefore was to go to the Scandinavian countries to (1) investigate the industrial education programs on various educational levels, (2) ascertain the …

Development And Use Of A Computer Simulation Model For The Evaluation Of Design And Control Alternatives For Intersections Of Minor Road With Multi-Lane Rural Highways: Field Studies And Model Validation: Interim Report, Ahmed Essam Radwan, Kumares C. Sinha, Harold L. Michael

JTRP Technical Reports

No abstract provided.

Plasma Polymerization Of Tetrafluoroethylene. I. Inductive Radio Frequency Discharge, H. Yasuda, N. Morosoff, E. S. Brandt, C. N. Reilley

Chemistry Faculty Research & Creative Works

The plasma polymerization of tetrafluoroethylene in an inductively coupled radio frequency glow discharge, using a flow system, was studied. A simple long tube reactor, with the coupling coil placed at the middle of the tube and gas entrance and exit at the respective ends, was used. Deposition rates and the chemical nature of the polymer (as revealed by ESCA spectra and surface energy studies) are obtained as a function of location in the reactor tube with respect to the coupling coil and of applied energy per unit mass of tetrafluoroethylene (W/FM). It was found that a fluorine poor polymer, containing …

Thermally Stimulated Polarization Current Technique For Measuring The Electrical Conductivity Of Vitreous Solids, Chi-Ming Hong, D. E. Day

Materials Science and Engineering Faculty Research & Creative Works

The electrical conductivity of glasses determined by TSPC agrees well with that measured by conventional ac or dc techniques. The TSPC technique is a rapid and easy method of measuring the dc conductivity over the range 10−15-10−7 (Ω cm)−1 and is especially suited for conductivities <10−12 (Ω cm)−1. Polarization at the electrodes is easily detected and avoided.

Transform Domain Motion Estimation, J. A. Stuller, A. N. Netravali

Electrical and Computer Engineering Faculty Research & Creative Works

This Paper Introduces an Algorithm for Estimating the Displacement of Moving Objects in a Television Scene from Spatial Transform Coefficients of Successive Frames. the Algorithm Works Recursively in Such a Way that the Displacement Estimates Are Updated from Coefficient to Coefficient. a Promising Application of This Algorithm is in Motion‐compensated Interframe Hybrid Transform‐dpcm Image Coding. We Give a Statistical Analysis of the Transform Domain Displacement Estimation Algorithm and Prove its Convergence under Certain Realistic Conditions. an Analytical Derivation is Presented that Gives Sufficient Conditions for the Rate of Convergence of the Algorithm to Be Independent of the Transform Type. This …

An Adaptive Intraframe Dpcm Codec Based Upon Nonstationary Image Model, N. F. Maxemchuk, J. A. Stuller

Electrical and Computer Engineering Faculty Research & Creative Works

This Paper Introduces a Nonstationary Model for Images and Develops an Adaptive Intrafield Dpcm Codec based Upon the Model. the Codec Attempts to Minimize the Mean‐square Coding Error at Each Sample Point in the Picture. the Quantizer in the Resulting Adaptive Codec is Found to Be Similar to that Previously Obtained from Visual Masking Considerations. Comparative Simulation Results using 256 X 256 Pixel Rasters Are Given for Two‐ and Three‐bit/pixel Versions of the Adaptive Codec, the Three‐bit/pixel Graham Codec, and Three‐bit/pixel Previous Element Dpcm. © 1979 the Bell System Technical Journal

A Microcomputer-Based Data Acquisition System With Hardware Capabilities To Calculate A Fast Fourier Transform, R. A. Kobylinski, Rodger E. Ziemer, Paul D. Stigall

Electrical and Computer Engineering Faculty Research & Creative Works

The Fast Fourier Transform (FFT) Has in Recent Years Become an Important Tool to the Engineer. There Are a Number of Algorithms Which Calculate the FFT. One Such Algorithm is the Cooley-Tukey FFT Algorithm (Radix-2) Which Lends itself Rather Easily to a Combination Software and Hardware Implementation. with a Microcomputer as the Controller of a Data Acquisition Module and Hardware Which Computes the Butterfly Associated with the FFT Algorithm, the FFT Can Be Calculated Efficiently. © 1979 IEEE

Attenuation And Speed Of 10 Mhz Ultrasound In Canine Blood Of Various Packed Cell Volumes At 37c, D J. Hughes, L A. Geddes, Charles F. Babbs, J D. Bourland, V L. Newhouse

Weldon School of Biomedical Engineering Faculty Publications

The attenuation coefficient and the speed of 10 MHz ultrasound were determined in canine blood at 37 oC by a differential path length technique. Blood specimens with packed cell volumes (PCV) ranging from 0 to 53% were prepared by separating the cells from the plasma and mixing the two components. The mean attenuation coefficient increased linearly with packed cell volume, the least squares regression function being  (dB/cm) = 0.992 +0.039 PCV with a standard error of the estimate = 0.255. The speed of 10 MHz ultrasound, c, in millimetres per second, increased with packed cell volume, the regression function …

Elevation Of Ventricular Defibrillation Threshold In Dogs By Antiarrhythmic Drugs, Charles F. Babbs, Gkw Yim, S J. Whistler, W A. Tacker, L A. Geddes

Weldon School of Biomedical Engineering Faculty Publications

Effects of antiarrhythmic drugs upon the threshold delivered energy (TDE) and threshold peak current (TPC) for electrical ventricular defibrillation by damped sinusoidal shocks were investigated in 25 pentobarbital-anesthetized dogs. TDE and TPC were increased by the three antiarrhythmic drugs tested. Bolus injections produced a transient rise, and continuous infusions produced a steady rise in defibrillation threshold. The maximal percent elevations in mean defibrillation threshold during the 60 minutes after intravenous drug treatment in groups of n = 5 dogs were: Treatment % increase in TDE % increase in TPC Lidocaine bolus (3 mg/kg) 48 26 Lidocaine (0.5 mg/Kg/min) 99 45 …