Engineering Commons^™

Traffic Speed Report No. 97 : Interim Report, Ahmed Atef Gadallah, George K. Stafford

JTRP Technical Reports

No abstract provided.

The Fluid Motion Due To A Rotating Disk, Ralph E. White, Charles M. Mohr Jr, John Newman

Faculty Publications

No abstract provided.

Scattering Of Argon And Neon From W(112), Ralph E. White, Jean Jacques Ehrhardt, Robert P. Merrill

Faculty Publications

No abstract provided.

Numerical Simulation Of A Widely Used Cloud Nucleus Counter., Darryl J. Alofs, J. C. Carstens

Mechanical and Aerospace Engineering Faculty Research & Creative Works

The Performance of the Conventional Horizontal Plate Thermal Diffusion Chamber as a Cloud Nucleus Counter Was Studied. Numerical Calculations Were Performed in Order to Follow the Simultaneous Drop Growth and Sedimentation in the Spatially and Temporally Nonuniform Supersaturation Field. the Effect of Nuclei Distribution and Smallest Detectable Drop Size Were Investigated. the Results Indicate Order of Magnitude Uncertainty in the Count at 0. 1% Supersaturation, and a Factor of 2 Uncertainty at 1. 0% Supersaturation.

Mie Scattering Computations For Moderately Large Spherical Particles, Dwight C. Look

Mechanical and Aerospace Engineering Faculty Research & Creative Works

No abstract provided.

The Effects Of Main-Flow Radial Velocity On The Stability Of Developing Laminar Pipe Flow, F. C.T. Shen, T. S. Chen, L. M. Huang

Mechanical and Aerospace Engineering Faculty Research & Creative Works

In studying the stability due to axisymmetric disturbances of the developing flow of an incompressible fluid in the entrance region of a circular tube, a generalized version of the Orr-Sommerfeld equation was derived which takes account of the radial velocity component in the main flow. The new terms in the generalized Orr-Sommerfeld equation are inversely proportional to the Reynolds number. The resulting eigenvalue problem consisting of the disturbance equation and the boundary conditions was solved by a direct numerical integration scheme along with an iteration procedure. Neutral stability curves and critical Reynolds numbers at various axial locations are presented. A …

Installation Induced Stresses For Grouted Roof Bolts, R. N. Nitzsche, Charles J. Haas

Mechanical and Aerospace Engineering Faculty Research & Creative Works

The judicious use of roof bolts in stabilizing underground openings necessitates the ability to determine the state of stress in and around such bolts. A method of modeling a system of roof bolts is presented. This method is then applied in the determination of the state of stress due to bolt tightening. Two specific roof bolt configurations are considered: a fully grouted post-tensioned bolt and a post-tensioned bolt with grouted-end anchorage. The analysis showed that the grout annulus transferred nearly all of the bolt load 3nto the rock within a distance of 12 hole diameters from the point of bolt …

Heat Pump Research Programme At University College Dublin (1976), Seamus Timoney, Jim Mcgovern

Conference Papers

This paper describes heat pump research at University College Dublin in 1976 relating to an air-to-air heat pump. The plant under test and its instrumentation are described and some measured performance data are presented. A heat pump simulation program is described. A theoretical comparison of refrigerants 12, 22 and 502 is presented with graphs of performance parameters as a function of operating conditions.

The Use Of Skewed Speed Distributions To Locate Points Of High Accident Potential On Low Volume Two-Lane Rural Highways, Robert J. Krzeminski

JTRP Technical Reports

No abstract provided.

State Highway Finance And User Taxation In Indiana, John Raymond Mccarthy

JTRP Technical Reports

No abstract provided.

Predicting Performance Of Pipe Culverts Buried In Soil, Phase 1 : Interim Report, G. A. Leonards, Mihir Baran Roy

JTRP Technical Reports

No abstract provided.

Development Of Techniques For Plant Establishment On The Roadside, Philip L. Carpenter, David L. Hensley

JTRP Technical Reports

No abstract provided.

Landscape Plant Response To Different Levels Of Four "Slow Release" Fertilizers: Interim Report, Philip L. Carpenter, David Foster Hamilton, Robert E. Mcniel, Nancy Levinskas

JTRP Technical Reports

No abstract provided.

The New Lead Belt In The Forested Ozarks Of Missouri, Bobby G. Wixson, J. Charles Jennett

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

No abstract provided.

Evaluation Of Paint-Stripe Beads, Jerry G. Pigman, Kenneth R. Agent

Kentucky Transportation Center Research Report

The objectives of this phase of the overall "Roadway Delineation" study were to evaluate the luminosity and durability of several types of glass beads and one type of plastic bead used with paint stripes and to determine their effectiveness during rainy, nighttime conditions. Eleven types of beads were evaluated. They were applied at rates approximating 4, 5, and 6 pounds per gallon (479, 599, and 719 kg/m3). Photometer and visual observations extended to about 9 months after application of test stripes.

Happenings 11 (December 1975-January 1976 Newsletter), College Of Public Affairs And Community Service, University Of Nebraska At Omaha

CPACS Newsletters

The College of Public Affairs and Community Service (CPACS) newsletter that reported on the news, collaborations, events, and general happenings of the UNO College of Public Affairs and Community Service. This newsletter has had many names and variations over the years including SPACS Newsletter (1973); Newsletter of the College of Public Affairs and Community Service (1973-1974): Happenings (1974-1980s); and the current e-newsletter titled the CPACS Collective (2021-)

Anion Grain-Boundary Diffusion In Soidum Chloride, K. S. Sabharwal, J. Mimkes, Manfred Wuttig

Materials Science and Engineering Faculty Research & Creative Works

The grain-boundary diffusion of 131I in Harshaw pure and Ca-doped NaCl was investigated in the temperature range between 430 and 560°C. The Arrhenius plot of the grain-boundary diffusivity parameter Dδ displays a marked dip at around 510°C. It is proposed that this dip is due to a phase transformation occurring at the grain boundary, possibly calcium segregation.

Design Of Film-Substrate Single-Reflection Linear Partial Polarizers, R. M.A. Azzam, A.-R. M. Zaghloul, N. M. Bashara

Electrical Engineering Faculty Publications

The results of a preceding paper [J. Opt. Soc. Am. 65, 1464,(1975)] are viewed from a different angleas providing the basis for the design of film-substrate single-reflection linear partial polarizers (LPP),which also operate as reflection optical rotators. The important characteristics of a comprehensive set of discrete designs of SiO₂-Si LPP’s at λ = 6328 Å are shown graphically.

Polarizer-Surface-Analyzer Null Ellipsometry For Film-Substrate Systems, R. M.A. Azzam, A.-R. M. Zaghloul, N. M. Bashara

Electrical Engineering Faculty Publications

Single-pass polarizer-surface-analyzer null ellipsometry (PSA-NE) can be used to characterize film-substrate systems, provided that the film thickness lies within one of a set of permissible-thickness bands (PTB). For a transparent film on a transparent or absorbing substrate, the PTB structure consists of a small number of finite-bandwidth bands followed by a continuum band that extends from a film thickness of about half the wavelength of light to infinity. We show that this band structure is a direct consequence of the periodicity of the ellipsometric function ρ (the ratio R_p/R_s, of the complex amplitude-reflection coefficients for …

Optimal And Suboptimal Estimation In Differential Pcm And Adaptive Predictive Coding Systems, Jerry Gibson

Department of Electrical and Computer Engineering: Faculty Publications

Both differential pulse code modulation (DPCM) and adaptive predictive coding (APC) systems have been used somewhat successfully for low date rate digital voice transmission. A DPCM system has as its goal the removal of signal redundancy prior to transmission by a linear prediction of the incoming signal with a weighted combination of past signal estimates. The error in the prediction process is then quantized and transmitted to the receiver. An identical prediction loop is used at the receiver to reinsert the redundancy, and hence, to reconstruct the speech signal. Both the quantizer and predictor may or may not be adaptive.

Threshold Characteristics Of Multimode Laser Oscillators, Lee W. Casperson

Electrical and Computer Engineering Faculty Publications and Presentations

The oscillation characteristics of a multimode laser are considered in detail, and for the first time saturation by all of the cavity modes is included. Analytical expressions are obtained for the mode amplitudes, linewidths, and over‐all spectral characteristics of lasers operating above and below threshold. It is found that with increasing excitation the spontaneous emission spectrum is gradually resolved into a set of narrow discrete modes. Slightly above threshold the number of modes reduces in a homogeneoulsy broadened laser until only a single mode is oscillating strongly. The theoretical results are in agreement with experimental data that have been reported …

Inelastic Reserve Capacity Of Cold-Formed Beams With Stiffened Compression Elements, Hans Peter Reck, George Winter, Teoman Peköz

CCFSS Library (1939 - present)

PREFACE The present Report No. 356 deals with the inelastic reserve strength of cold-formed beams with stiffened compression flanges. The usual elastic design criterion regards the initiation of yielding in the outer fibers as defining failure. This criterion is used in Part I of the A.I.S.C. Specification and in the A.I.S.I. Specification for the design of steel structures. On the other hand, for so-called compact sections, as defined in the A.I.S.C. Specification, it is known that the actual maximum moment of a cross-section exceeds the initial yield moment and is reached only when yielding spreads over the entire section (complete …

Interpretation Of Tests On Welded Light Gage Steel Connections, Mark Shephard, George Winter, Teoman Peköz

CCFSS Library (1939 - present)

INTRODUCTION This report interprets the results of three sets of test data (Ref. 1 through 3) on welded light-gage cold-formed steel specimens. The tests were conducted at Cornell for the American Iron and Steel Institute on 252 symmetric puddle and fillet welded connections tested under monotonically increasing static load. The tested connections consisted of 130 shop welded specimens and 122 field welded specimens. All test connections had the same basic configuration being made up of center plates, referred to as parent plates or connected plates in the references, butted together with one or, in the case of the double sheet …

Pedestrian Accidents In Kentucky, Charles V. Zegeer, Robert C. Deen

Kentucky Transportation Center Research Report

Pedestrian accident data in Kentucky were analyzed for 1972 and 1973 on a rural, urban, and statewide basis. Results showed that about 1500 pedestrian accidents occur in Kentucky each year. About 30 percent of the pedestrian accidents in rural areas and four percent in urban areas are fatal. Although about 78 percent of Kentucky's pedestrian accidents occur in urban areas, over 62 percent of the pedestrian fatalities occur in rural areas. Specific characteristics of pedestrian accidents were identified and related to human, environmental, and time factors. Highway and street improvements and safety measures generally considered to be effective in minimizing …

Identification Of Hazardous Locations On City Streets, Charles V. Zegeer

Kentucky Transportation Center Research Report

The purpose of this study was to develop an effective method for identifying hazardous locations in Kentucky cities (over 2,500 population). Methods used in 45 other states were reviewed. Accident information for 69 of the 97 cities over 2,500 population was used to develop criteria for an identification method.

A Number Method was selected for initial identification of midblocks and intersections on arterial-collector streets and on urban freeways. Rate-Quality Control Methods were included in the form of a critical rate factor computed for each location. A set of critical rate curves was constructed for easy determination of critical locations. A …

Mode Properties Of Annular Gain Lasers, Lee W. Casperson, Mohammad Shabbir Shekhani

Electrical and Computer Engineering Faculty Publications and Presentations

The properties of a new class of laser resonators are investigated theoretically and experimentally. In these lasers the radiation propagates longitudinally in an annular amplifying medium, and useful low loss modes can be obtained even when the axial region is obscured. Alignment characteristics and far field patterns are discussed, and experiments have been conducted using coaxial double-discharge CO₂ devices.

Front Matter, University Of Missouri--Rolla

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

No abstract provided.

Opening Remarks, Raymond L. Bisplinghoff

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

You are all extended the very warmest welcome to the University of Missouri-Rolla. This four day conference on energy, the second of its kind, is filled with papers and activities that should find some interest for almost everyone involved in energy activities. All of us on this campus want you to have a rewarding four days and to enjoy yourselves as well. It goes without saying that we stand ready to aid you in every way that is possible. I want to commend the organizers, particularly Dr. Derald Morgan, for his hard and dedicated work in putting the conference together.

Energy Conservation In Uniroyal, Inc., John C. Madigan

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

In the last year, rapid developments have led to the establishment of industry conservation goals and monitoring by the Department of Commerce and the Federal Energy Administration via the various industry associations.

Since 1972, Uniroyal has progressed more than half way toward the 1980 goal of 15% established for the rubber and chemical industries. This paper will describe details of the program with emphasis on new input, such as the computerized tracking method now in use.

Plant studies have provided an assessment of "base" loads vs. process loads, important when considering unit energy consumption. These vary, particularly with the climate …

The Energy Conservation Implications Of Master Metering Of Electric Service In Apartments, Gordon Gross

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

A study has been made of the difference in electricity usage between residents of "Electricity included" apartments and those tenants who pay individual "light bills." The factors which influence owners' and builders' choices of metering service are discussed in detail.

Data taken from over 100 apartment buildings or complexes in 10 major U.S. metropolitan areas and from over 50 major electric power companies are used as the basis for the reported results. Contractors estimates of the costs to convert building service from master to individual meter and some bases for these costs are presented.

The energy conservation potential which might …