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The Relationship Between Teacher Sex Role Models And Career Aspirations Of High School Industrial Arts Students, Janet Lynn Robb

Dissertations and Theses @ UNI

Sex role stereotyping has been the focus of a number of research projects trying to determine just where stereotyping lies and ways to eliminate it. Although most of the research points toward role modeling as a major cause, little has been done to test that theory.

The purpose of this study was to determine the relationship between teacher sex role models and the career aspirations of students enrolled in high school industrial arts courses throughout the United States. This study was limited to tenth, eleventh, and twelfth grade students enrolled in industrial arts programs in high schools in the United …

Complete Elastic-Plastic Solution Around A Tensile Crack In Strain-Hardening Materials, Clancy Hatleberg

Mechanical Engineering ETDs

A complete elastic-plastic solution for both small and large scale yielding is found for the total stress field surrounding a tensile crack in an infinite sheet of strain-hardening materials under conditions of plane stress. The solution is based on the deformation theory of plasticity in conjunction with strain-hardening stress-strain relations, and is found by using the minimum of a modified complimentary energy principle coupled with a modified Ritz method. Numerical results are obtained for two approximate constitutive laws; a Ramberg-Osgood stress-strain relation and a modified Ramberg-Osgood stress-strain relation. Results indicate that the total stresses are discontinuous as the crack tip …

Real-Time Estimation Of Aerodynamic Coefficients By Means Of An Extended Kalman Filter, James Robert Kelsey

Electrical and Computer Engineering ETDs

A technique for estimation of the aerodynamic parameters of a flight vehicle from onboard measurements is presented.

An extended Kalman filter is used to extract the parameters in the presence of measurement noise and initial uncertainty of the parameter values. Computer generated data were used for the measurement information in lieu of actual flight data.

Several state models of varying complexity are studied in an attempt to find a model which yields adequate estimates while minimizing the required computation time.

Acuta Enews December 1978, Vol. 7, No. 12

ACUTA Newsletters

In This Issue

PRESIDENT'S MESSAGE

POTPOURRI

1979 ACUTA CONFERENCE ACTIVITIES QUESTIONNAIRE

MOUTH OF THE SOUTH

PARTY LINE

MOTOROLA

Bulletin - December, 1978, Civil Aviation Medical Association

Browse all Civil Aviation Medical Association Newsletters

A six page newsletter of the Civil Aviation Medical Association. The newsletter provided news about civil aviation medicine and information related to the organization.

The Evaluation Of Corrosion Inhibitors For Controlling Corrosion In Closed Paper Mill White Water Systems, Ifeanyi E. C. Okeke

Masters Theses

No abstract provided.

Low-Void Concrete Mixtures, Assaf S. Rahal, James H. Havens

Kentucky Transportation Center Research Report

The purpose of this study was to modify concrete mix-design formulas to supplant all water over and above that needed for hydration with a non-evaporable liquid material and(or) a super-water-reducer or plasticizer -- thus producing a low-void concrete. A water-cement ratio of 0.244 - 0.30 was presumed minimal for hydration of the cement. Several polymeric materials, asphalts, oils, and superplasticizers were used. Success was achieved with two latexes, one epoxy, and several superplasticizers. The use of these materials in concrete resulted in improved strength, reduction of air voids and permeability, and enhancement of resistance to corrosive chloride salts.

A Study Of A Wind Tunnel Measurement System For Unsteady Pressures Using Pneumatic Transmission Lines, Mohammed Javed Khan

Theses and Dissertations

The application of pneumatic transmission lines theory to a tube-scanning valve system for unsteady pressure measurements in the AFIT 5-foot wind tunnel is investigated. Transfer gains of various tube-scanning valve configurations were experimentally measured and the validity of a theoretical model verified for a frequency range of 20 Hz to 140 Hz. The selected system having a 0.0625-in. ID flexible tube of 84 in. length connected to a scanning valve was installed in the wind tunnel. Unsteady pressures introduced over an 18 percent airfoil at zero angle of attack were measured with this system. Data were collected for 0, 40, …

Acoustic Emission Monitoring Of Weldments, Theodore Hopwood Ii, James H. Havens

Kentucky Transportation Center Research Report

Weld tests were performed on low-carbon and high-strength, low-alloy steel weldments. The weldments were monitored with an acoustic emission detector during both the 'in-process' and the 'in-cooling' phases of the welding operation. Artificial defects were induced in several of the welds to promote cracking. Some high-strength weldments were designed to produce welds subject to high restraint.

Nondestructive and destructive evaluation of the completed weldments revealed that high acoustic emission activity 'in-cooling' could be correlated with embedded defects and cold-cracking. Copious emission activity was also detected from unflawed weldments. Acoustic emissions were detected in high-strength steel weldments for periods up to …

Deck-Reinforced Slab Systems, Max L. Porter, C. E. Ekberg Jr.

CCFSS Library (1939 - present)

No abstract provided.

University Programs In Air Pollution Control: Review And Outlook, August T. Rossano, Harold M. Cota

Civil and Environmental Engineering

From the inception of the National Air Pollution Control program, the U. S. Congress has been mindful of the need and importance of adequate manpower. The challenging technical problems which lie ahead in enforcement, monitoring, testing and research can be effectively dealt with only by individuals with specialized knowledge, skills and experience. In this paper the authors look at undergraduate and graduate training that is being carried out, employment opportunities and the way these may change in the future. A recently completed survey of college level air pollution training in the United States and Canada is included in the report.

Energy In Agriculture: Grassland Renovation--Conserves Oil And Energy And Increases Returns From Grass Fields, Edward M. Smith, Larry W. Turner

Agricultural Engineering Energy Series

Fifty-four percent (1.2 billion acres) of land area in the 48 continental United States consists of grasslands, shrublands and open forests. For the most part, there is no alternative use of these land resources in production of food for man other than by way of ruminant animals. Sixty-nine percent (835 million acres) of these land resources is being utilized by grazing animals and forms the basis for a livestock industry which represents 43% of all agricultural receipts in the United States.

Priority Programming For Highway Reconstruction, Charles V. Zegeer, Rolands L. Rizenbergs

Kentucky Transportation Center Research Report

An adequacy-rating procedure was developed for use in priority programming for highway reconstruction. The procedure makes use of 15 roadway and traffic elements to rate highway sections in urban and rural areas based on 100 points. Condition elements (35 points) include a subjective rating of highway foundation, pavement surface, drainage, and maintenance economy. Safety elements (35 points) are stopping sight distance, highway alignment, skid resistance, accident experience, and traffic control devices. Service elements (30 points) include shoulder width, passing opportunity, rideability, surface width, volume/capacity ratio, and average speed.

Some of the advantages of the new procedure include computerized analysis of …

Design System For Asphaltic Concrete Overlays, Herbert F. Southgate, Gary W. Sharpe, Robert C. Deen

Kentucky Transportation Center Research Report

A method of designing asphaltic concrete overlays has been developed from (1) Kentucky's theoretical design curves, (2) an estimate of future traffic and the associated fatigue (five procedures are presented according to types of information available), (3) strength of subgrade on subject project (laboratory CBR tests or results of dynamic in-place tests such as the Road Rater), and (4) present condition of the existing pavement (from dynamic in-place tests, roughness measurements, or present serviceability index). Deterioration has been expressed as reduced or effective thicknesses of new-quality materials producing the same measured dynamic deflections. The total thickness required for the future …

Seatbelt Usage In Kentucky [Nov. 1978], Kenneth R. Agent, Michael Barclay, Robert C. Deen

Kentucky Transportation Center Research Report

In this report, the effectiveness and usage of seatbelts in Kentucky and factors affecting usage are examined and identified. Data were obtained from three sources: field observations, accident reports, and a questionnaire.

Kentucky drivers and passengers were found to have lower seatbelt usage rates (slightly under 10 percent) than drivers and passengers in other states. The accident data showed that the chances of being killed or severely injured is greatly reduced by wearing a seatbelt. Seatbelts reduced the chance of being killed by a factor of six and the chance of being severely injured by a factor of two. Several …

Statewide Survey Of Skid Resistances Of Pavements [Nov. 1978], Rolands L. Rizenbergs, James L. Burchett

Kentucky Transportation Center Research Report

In 1969, a research-type, skid-test trailer was acquired, U.S. routes were surveyed in 1970 and 1971, and the interstate and toll-road systems were surveyed in 1971. The data were used for research purposes and have been reported. The interstate and toll-road systems were surveyed again for research purposes in 1974. Since October 1974, surveys have been performed under highway safety project grants (interaccounted to 108, subsection OSKID). Primary and principal secondary roads, involving 4,613 miles (7,427 km), were surveyed in 1975. A second skid tester, a survey-type, was acquired in April 1976; and survey-testing of major, rural collector roads continued …

Pavement Evaluation Using Dynamic Deflections, Gary W. Sharpe, Herbert F. Southgate, Robert C. Deen

Kentucky Transportation Center Research Report

Dynamic test deflections have been duplicated by elastic theory using the Chevron N-layered computer program. Dynamic surface deflections obtained using the Road Rater have been used in conjunction with elastic theory to analyze pavement behavior. A procedure has been developed to use field measured Road Rater deflections to estimate the elastic moduli of the foundation material and to determine the equivalent thicknesses of new material which approximate the behavior of the structure. The estimated moduli and (or) equivalent thicknesses may be used as inputs to design overlay thicknesses. An analysis of the deflections of the first three sensors of the …

Solar Technology Inventory For The Mid-American Region, L. Icerman, S. K. Parker

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

A mailed questionnaire and telephone contact procedure was developed to identify solar equipment manufacturers in the Mid-American Solar Energy Center (MASEC) region and to collect information required to characterize the solar equipment manufacturing industry. Special emphasis was placed on assembling data that are useful in evaluating the commercialization status of the solar energy industry from an equipment supplier viewpoint.

The Role Of The Civex Process In The Nuclear Industry, Thomas E. Eaton, Joseph C. Carter

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

The United States is committed to policies which would assure that the international, commercial nuclear industry cannot be exploited as a source of materials for nuclear weapons. The Civex process provides for a proliferation-resistant fast breeder reactor fuel cycle. Nevertheless, the risk of nuclear weapons proliferation involving the commercial nuclear industry is small compared to the risk associated with certain research facilities and military activities.

Direct Energy Conversions Of Solar Energy, A. A. Rahman

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

In this paper, the design concepts of three direct energy converters were explained. The converters selected were thermoelectric, thermionic and magnetohydrodynamic converters. Discussions and analysis of the material limitations of these converters with possible improvements to make these devices suitable for domestic or public use was also explained.

Low Btu Producer Gas -- A Fuel Of The Past And A Fuel Of The Future, Lee Carter

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

A prime purpose of this paper is to give conscious emphasis to an important type of coal gasification, one that does not demand hundreds of millions of dollars to launch an experimental program but instead is essentially ready to use after a reasonable and straightforward engineering check-out of the local coal sources and the prospective gas demand.

That type of coal gasification results in low Btu producer gas. This paper deals with its history, its technology and its economics. In the light of that information, the future of low Btu producer gas in America then is assessed.

Ambient Air Quality As Related To Energy Conversion Facilities, Economic Activity And Population, Walter P. Page

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

The paper examines the relationships between ambient air quality and energy conversion facilities, economic activity and population. Additional results are presented from investigation of the relationship between ambient air quality and total emissions from four source categories.

Effective Utilization Of Energy From Biomass Residues In Agricultural Applications, Harry W. Parker

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

Biomass is one of the more attractive alternative energy sources. Use of existing biomass residues within the farm and ranch economy can be accomplished with a minimum of organizational problems since the producer, processor, and consumer may be the same person or organization. The major task is to provide potential agricultural biomass users with accurate cost estimates for the energy made available from the biomass, and contemporary technology for its utilization.

Specific examples are given with regard to powering irrigation well engines with cotton gin trash via a producer gas generator, and conversion of harvested mesquite wood to digestible energy …

Concentration Of Solar Energy Using A Cassegrain Type Solar Furnace, M. H. Cobble, W. C. Hull

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

A solar furnace consisting of a paraboloid of revolution that tracks the sun, and a hyperboloid of revolution reflector that has a focus in common with the paraboloid is analyzed using a three-dimensional ray trace to determine the image shape and size, and for the concentration to be obtained for various eccentricities e of the hyperboloid when used with an 84 foot diameter paraboloid (radar dish).

Commercially Available Vacuum Tube Solar Collectors, Stanley J. Ring

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

Efficiencies on the order of 50 percent with high differential temperature (150° C) have been advertised with the current distribution of commercially available evacuated tube collectors. Product specifications and, where possible, experimental data have been gathered and presented. The paper also develops a mathematical model for evaluation of these collectors. Results conclude that, although performance is high, collector expense limits the cost effectiveness to necessary high-temperature, high-volume applications. These include both residential cooling and industrial processing.

Assessment Of Residential Energy Use: Some Results And Methodologies, Gunar E. Liepins

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

This paper addresses the problem of determining residential energy use. Specifically, it discusses some of the estimation methods, selected results, and potential errors in the estimates.

Energy Evaluation And Component Characterization Data In A Residential Solar Monitoring Program, Gene E. Kouba, William P. Moran, Bruce V. Ketcham

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

The initial phase of performance analysis, data acquisition system development and short term component characterization of a two year residential solar energy monitoring program are presented. The purpose of the monitoring program is to accumulate both short and long term performance data which would be useful in optimizing system operation, determining possible improvements to the system configuration, validating simulation methods for predicting performance, and estimating the economics of the system.

Industrial Energy Conservation Through Boiler Operation Efficiency Improvement, Dupree Maples, G. D. Whitehouse

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

A method of determining the minimum amount of oxygen in the flue gas which results in the most efficient combustion is discussed. Results of field test are presented. The magnitude of the stack gas losses is dependent on the stack gas composition determined by the fuel and quantity of excess air and the stack temperature.

Carrying Water To Newcastle, Lloyd Lore Wartes

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

Western coals, now being shipped by unit trains to eastern and southern markets, contain from 13% to 32% moisture. Drying of these coals at the mine would reduce the cost of coal to the utilities from 10% to 16% IF the railroads do not materially increase rates on higher BTU coal.

The spontaneous combustion of dry coal can be inhibited, and the savings per unit train should range from $1,375,000 to $4,129,000 per year according to the various minimum tonnage rates. The shipment of dried coal will reduce the tonnages being shipped by 15%, or increase the railroad carrying capacity …

Effective Use Of Bottom Ash As A Geotechnical Material, Braja M. Das, Ali A. Selim, Tom W. Pfeifle

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

Some geotechnical properties of bottom ash produced from the burning of North Dakota lignite in a power plant are presented. These properties include grain size distribution, maximum and minimum void ratios, maximum dry density of compaction and optimum moisture content from standard Proctor tests, angle of friction, one-dimensional compressibility, and coefficient of permeability. The geotechnical properties of this bottom ash, as determined from laboratory tests, appear to be comparable to those generally obtained from poorly graded sands and indicate that bottom ash can be used for such works as backfill of retaining structures, construction of highway embankments, and fill material …