Engineering Commons^™

Computerized Twist Drill Selection For Cast Iron And Steel, Clinton K. Orth

Graduate Research Papers

The science of hole making can hardly be considered new to modern day industry. Evidence of drilling dates back as early as 4000 B.C. However, computers are considered relatively new to industry and their use is growing rapidly. One of the major concerns of industry is to identify a consistent method of selecting the proper drill when given a set of variables. The problem is to identify the sets of variables and select a drill that will give consistent results.

Web Crippling And Combined Web Crippling And Bending Of Steel Decks, Wei-Wen Yu

CCFSS Library (1939 - present)

INTRODUCTION A. General During the period of October 1968 through September 1980, the 1968 Edition of the AISI Specification was used for the design of steel deck webs that could withstand web crippling and combined web crippling and bending. (1) The design formulas used to prevent web crippling were developed primarily on the basis of tests conducted in the 1940's and 1950's at Cornell University. (2-4) Recently, new types of cold-formed steel sections have been developed and used in building construction. The use of unusual geometric configurations has complicated the design of such members. In order to develop new design …

Application Of Generalized Geometric Programming In Preliminary Plant Design, Dennis R. Hoerner, Orrin K. Crosser

Chemical and Biochemical Engineering Faculty Research & Creative Works

This study utilizes a primal based generalized geometric programming algorithm for the optimal design of a model absorber-stripper process. The GGP algorithm reduces the generalized geometric program to a convex, linear program by two sequential condensation procedures and a logarithmic transformation. Although inactive Inequality constraints and arbitrary variable bounds were easily accommodated by the algorithm, considerable effort was required to activate the inequality constraints which required an equality condition. The GGP algorithm converged to a local minimum from arbitrary starting points for approximately 60% of the trials. © 1981, American Chemical Society. All rights reserved.

Survey Of Lane Delineation Methods, Kenneth R. Agent

Kentucky Transportation Center Research Report

The objective of this study was to summarize the nationwide experience pertaining to various lane delineation methods. The usage, cost, and problems associated with each alternative could then be analyzed for the purpose of determining an optimum marking program. A survey of the methods of lane delineation used across the United States was done by means of a questionnaire sent to each state. Responses were received from 46 states. Most of the information dealt with the following lane delineation methods: raised pavement markers, pavement tape, thermoplastic markings, and paint and beads.

Sprinkle-Treated Asphaltic Concrete Surface Course, Donald C. Newberry Jr.

Kentucky Transportation Center Research Report

This report gives details of construction and some skid resistance data from experimental sprinkle-treatment placed in Nelson County, Kentucky, north of Bardstown, US 31-E. The various types of aggregate, application rates, and precoating processes are reported.

Retrieval Guide: Kentucky Soils Data System, William J. Pfalzer, Louise B. Hensley

Kentucky Transportation Center Research Report

The Kentucky Soils Data System is an extensive data file of the physical properties and characteristics of soils as determined by field and laboratory testing. Site locations are available for most samples. Since Kentucky has been mapped geologically (scale 1:24,000), the bedrock at each of these sample locations can be determined, providing better opportunities for studying soil-bedrock (parent material) relationships. A complimentary report covers data input. This report is divided into two sections: data availability and data retrieval. The first section is designed to show the quantity and types of data available and how the data are distributed geographically. The …

Survey Of Effectiveness Of Transportation Services, Jerry G. Pigman, Kenneth R. Agent, Joseph D. Crabtree

Kentucky Transportation Center Research Report

With increased emphasis on public accountability and program evaluation, the need for effectiveness measures to indicate the extent to which an agency's goals and objectives are being met is increasingly apparent. A research study was undertaken to establish and implement a procedure for monitoring the effectiveness of transportation services in Kentucky. Quantitative data for many of the effectiveness measures were obtainable only through responses from the public. Surveys of licensed drivers and bus riders were selected as data sources. This report addresses the procedures and results of the two surveys. Responses were received from 35.5 percent of the 10,000 licensed …

Cpacs Happenings (April-May 1981 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-)

Crop Residue Management For Water Erosion Control, Elbert C. Dickey, P. W. Harlan, Don Vokal

Department of Agricultural and Biological Systems Engineering: Faculty Publications

Crop residues are playing an increasingly important role in today's agricultural management systems. In the past, residues were normally chopped or disked and plowed under in the process of seedbed preparation. Distributed throughout the deep-tillage layer, the residues decomposed rapidly and recycled organic matter back into the soil. Use of the traditional moldboard plow tillage system also provided a loose, residue-free seed bed. Unfortunately, moldboard plow tillage systems have high soil moisture losses which can reduce yields in low rainfall areas or during dry years.

Incorporating previous crop residues also leaves the soil surface exposed to agricultural runoff which causes …

Laser Broadening Ratio From The Multimode Oscillation Threshold, Lee W. Casperson

Electrical and Computer Engineering Faculty Publications and Presentations

Lasers with mixed line broadening typically oscillate in a single longitudinal mode for excitation levels only slightly above threshold. At high pump levels, less desirable multimode oscillation may sometimes occur. A procedure is described for using the multimode threshold as a sensitive measure of the broadening ratio, and GaAs is mentioned as an example.

Proton Induced X-Ray Emission Analysis - A Complement To Analytical Methods Used In Environmental Studies, N. F. Mangelson, D. J. Eatough, N. L. Eatough, L. D. Hansen, M. W. Hill, M. L. Lee, L. R. Phillips, M. E. Post, B. E. Richter, J. F. Ryder

Faculty Publications

Particle induced X-ray emission (PIXE) analysis is a highly versatile method of element analysis. Thus it is well suited for use as a complement to other methods of analysis in experimental programs requiring both chemical and elemental analyses. This paper reports some results of two projects where PIXE was used in conjunction with titration calorimetry, ion chromatography, atomic absorption spectroscopy, gas chromatography/mass spectrometry, X-ray fluorescence spectroscopy and some other methods. The first is a study of sulfur chemistry in a copper smelter plume. Arsenic was found to be a conservative tracer of the plume and was used for calculation of …

Multiple Scattering Of Protons And Deuterons By Thick Foils, D. R. Dixon, G. L. Jensen, S. M. Morrill, C. J. Connors, R. L. Walter, C. R. Gould, P. M. Thambiduria

Faculty Publications

Protons and deuterons from the Triangle Universities Nuclear Laboratory (TUNL) tandem Van de Graaff of energies 3.0, 4.0, and 5.0 MeV were scattered from foils of Al, Ni, Mo, and Ta having thicknesses of 6.14 to 47 mg/cm2. Multiple scattering angular distributions were measured using a position-sensitive detector to collect data at nine different angles simultaneously. Gaussian curves were fitted to the central points of the distributions and the Θ1/e angles thus derived are presented graphically. The data points are compared with calculations using a common method of determining multiple scattering angles. An empirical correction for extending this method into …

Effect Of Backup Roll Length And Roll Neck Length On Profile For 4-H Mills, T. Ohto, Guna S. Selvaduray

Faculty Publications

No abstract provided.

Development And Characterization Of A 9-Mm Inductively-Coupled Argon Plasma Source For Atomic Emission Spectrometry, A. D. Weiss, Richard N. Savage, G. M. Hieftje

Materials Engineering

A new 9-mm (i.d.) inductively-coupled plasma (ICP) torch is described which supports a stable, analytically useful plasma at less than 500 W of r.f. power and 7 l min^-1 total argon gas flow. Detection limits, working curves and other analytical characteristics of the new device are compared with those of both a miniature (13-mm i.d.) and conventional (19-mm i.d.) ICP. Although temperatures of the new plasma are somewhat lower than those in the larger plasmas, the new system offers promise for future, miniaturized ICP instruments.

Tillage Systems For Row Crop Production, Elbert C. Dickey, Allen Rider, Phillip W. Harlan

Department of Agricultural and Biological Systems Engineering: Faculty Publications

Selecting a tillage system that is best suited to a particular farming situation is an important management decision. In the past, a crop producer's primary concerns were field capacity and the costs of owning and operating equipment. However, with rapidly increasing energy costs, alternative tillage systems are being carefully evaluated and selected by more producers.

Previously, the most common tillage system included a moldboard plow to turn residue under either in the fall or spring. Following plowing, spring tillage normally included one or more shallow diskings to kill weeds, incorporate fertilizer and pesticides, and provide loose soil for seed. Other …

Behavior Of C- And Z-Purlins Under Wind Uplift, Parviz Soroushian, Teoman Peköz

CCFSS Library (1939 - present)

INTRODUCTION Cold-formed steel lipped channel (C-) and Z-purlins are used widely in the roofs of metal buildings. They are easy and economical to fabricate and erect. However these sections are weak in the lateral direction and in torsion. In order to use their full bending capacity in the strong direction, they must be braced in the lateral direction and against twisting. Roof panels which are connected to the purlins do provide to some extent such bracing effect by virtue of their shear rigidity and resistance to local bending at the connections. Wind uplift is an important design condition for roof …

Etl-0254, Terrain Analysis Procedural Guide For Soil, February 1981, Janet S. Wright, Theodore C. Vogel, Alexander R. Pearson, Jeffrey A. Messmore, Us Army Corps Of Engineers, Engineer Topographic Laboratories, Ft. Belvoir, Virginia, Robert Bolin , Depositor

United States Department of Defense Military Intelligence

This report is one in a series of terrain analysis procedural guides being developed in support of the Topographic Support System (TSS). It was written specifically for a U.S. Army terrain analyst and presents the step-by- step methods needed for extraction, reducing, and recording soil information on a factor overlay and supporting data table. It is a contribution to the Department of Defense terrain intelligence effort.

The report contains a detailed bibliography and a lengthy glossary.

A Site Evaluation For A Wind Generator At The University Of Northern Iowa, William A. Rosburg Ii

Graduate Research Papers

There is a need to develop alternative sources of energy other than our finite fossil fuel resources (Clews, 1975; Leckie, Masters, Whitehouse and Young, 1975). One possible area of great potential is the clean renewable energy in the wind. The World Meteorological Organization has estimated that there is a potential for producing 20 million megawatts of electricity from wind power (Clews, 1975). Although there are problems with cost, reliability, and its inherently intermittent nature, both government and industry are working to develop a wind technology that will help meet today's electrical energy needs.

An increased awareness by the general public …

Fire Protection Through Modern Building Codes, 5th Edition, James C. Spence, Walter G. Wells, D. F. Boring

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

Designing Fire Protection For Steel Trusses, Subcommittee On Fire Technology Of The Committee On Construction Codes And Standards, American Iron And Steel Institute

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

Fire Resistance Ratings Of Load-Bearing Steel Stud Walls, Subcommittee On Fire Technology Of The Committee On Construction Codes And Standards

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

Fire Resistance Ratings Of Load Bearing Steel Stud Walls With Gypsum Wallboard Protection, American Iron And Steel Institute

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

The Evolution Of A Tailored Communications Structure : The Topics System, Computerized Conferencing & Communications Center, Peter Johnson-Lenz, Trudy Johnson-Lenz

Computerized Conferencing and Communications Center Reports

A computer-based human communication system should be designed for people's use, in response to their perceived needs and communications styles; no single system can meet the needs of all groups and individuals. It might seem that a general electronic mail or computerized conferencing system with a standard set of features should be able to meet most communications needs, in much the same way that the telephone system meets the needs of a wide range of users. However, there are many communications structures found in everyday life, ranging from one-to-many news broadcasts, to the many-to-many patterns of town meetings, from the …

Guide To The Topics System, Computerized Conferencing & Communications Center, Peter Johnson-Lenz, Trudy Johnson-Lenz

Computerized Conferencing and Communications Center Reports

TOPICS is a system for computer-based information exchange among a network of people who share certain areas of interest. The system supports simultaneous discussion of many topics at once by allowing members to raise brief, pointed topics/inquiries and then to enter responses to those inquiries. The responses are shared with all members who express an interest in each topic by selecting it. The system is designed to facilitate the flow of inquiries and responses without overloading members with irrelevant or uninteresting information.

Nested within the Electronic Information Exchange System (EIES), this tailored communication system written in the INTERACT programming language …

Test 1383: Case 1690 Manual Diesel 12-Speed, 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 …

Test 1409: Hesston Fiat 1380 Dt 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 …

Phase 1 Inspection Report: National Dam Safety Program. White River Basin. Ozark Lead Tailings Dam, Reynolds County, Missouri, Woodward-Clyde Consultants, Chicago, Illinois

Missouri Dam Safety Inspection Reports

This report presents the results of field inspection and evaluation of the Ozark Lead Tailings Dam. It was prepared under the National Program of Inspection of Non-Federal Dams.

Steel Deck Institute, Inc. Design Manual For Composite Decks, Form Decks, And Roof Decks, Steel Deck Institute

Steel Deck Institute (SDI) Specifications and Manuals (1939 - present)

No abstract provided.

Steel Deck Institute Diaphragm Design Manual First Edition, Larry D. Luttrell

Steel Deck Institute (SDI) Specifications and Manuals (1939 - present)

The Major Units Laboratory at West Virginia University has been involved in full-scale diaphragm studies for the past fifteen years. The work has covered tests on a wide range of deck panel types, metal building wall systems, panels with insulating concrete fill, and plywood assemblies, all used as diaphragms, and under static, cyclic, and dynamic loading. Connection performance, critical to diaphragm behavior, has been evaluated through an extensive test program covering arc-spot (puddle) welds, different types of screws, and power driven pins. These have established fastener strength limits and have been especially important for defining fastener flexibility factors.

Bolted Connections In Cold Formed Steel Structures, Wei-Wen Yu, Randall L. Mosby

CCFSS Library (1939 - present)

No abstract provided.