Open Access. Powered by Scholars. Published by Universities.®

Engineering Commons™

Open Access. Powered by Scholars. Published by Universities.®

Series

Discipline
Institution
Keyword
Publication Year
Publication
File Type

Articles 67291 - 67320 of 75094

Full-Text Articles in Engineering

"Status Of Scour Instrumentation Development", Roy Trent, Ian Friedland Jan 1992

"Status Of Scour Instrumentation Development", Roy Trent, Ian Friedland

United States Department of Transportation: Publications

Improved understanding of scour and sedimentation processes near and at highway bridges is dependant on collecting reliable field data. Field data collection programs, however, have been hindered by inadequacies in instrumentation and measurement technologies. Through a coordinated program of research, the Federal Highway Administration (FHWA), State Highway Agencies (SHAs), National Cooperative Highway Research Program (NCHRP), and other agencies are working on scour instrumentation. Investigations are underway to develop a wide range of equipment types for many purposes and needs, e.g., portable equipment to be used by field crews during floods for scour inspection or measurement of scour processes; fixed equipment …

Go to article

Risk-Costs For Scour At Unknown Bridge Foundations, G. Kenneth Young, Stuart M. Stein, Roy Trent Jan 1992

Risk-Costs For Scour At Unknown Bridge Foundations, G. Kenneth Young, Stuart M. Stein, Roy Trent

United States Department of Transportation: Publications

A risk method sets priorities for bridge foundation information gathering. Scour failure risk is the product of failure cost and the probability of failure. The method is based on data (much of which is subjective) in the National Bridge Inventory, NBI. Risk determines the ranking of bridges for foundation data gathering in support of scour evaluation; high risks could vanish if substantial foundations are discovered.

Go to article

Flow Impingement Velocities, Snake River, Wyoming, Stephen T. Maynord Jan 1992

Flow Impingement Velocities, Snake River, Wyoming, Stephen T. Maynord

United States Army: Publications

Flow impingement, which occurs when approach channels direct flow into a bank line at large acute angles, results in flow concentration along bank lines, which creates large forces on bank material or bank protection. As part of studies conducted to determine the required riprap size for impinged flow, velocities were measured on the Snake River near Jackson, Wyoming. High velocities and steep water-surface slopes were observed at each impingement site.

Go to article

Revised Hydraulic Design Of The Los Angeles County Flood Control System, Michael E. Mulvihill, Scott E. Stonestreet Jan 1992

Revised Hydraulic Design Of The Los Angeles County Flood Control System, Michael E. Mulvihill, Scott E. Stonestreet

United States Army: Publications

The US Army Engineer District, Los Angeles, recently completed a study regarding the adequacy of an existing flood control system in Los Angeles County. Results of this study indicate that the level of protection afforded by the system is as low as 25-year in heavily urbanized areas. The Corps of Engineers plans to increase the capacity in two mainstem channels, raising the level of protection to greater than 1OO-year, by constructing parapet walls on top of existing levees and modifying constrictive bridges. A physical model study will be conducted to aid in analysis of complex design problems and will provide …

Go to article

Levee/Floodwall Freeboard Design For An Urban Flood Control Project, Daniel B. Pridal, Edward F. Sing Jan 1992

Levee/Floodwall Freeboard Design For An Urban Flood Control Project, Daniel B. Pridal, Edward F. Sing

United States Army: Publications

A methodology for the design of levee/floodwall freeboard using evolving guidelines based on the concept of superiority is presented. A case study illustrating the application of the freeboard design guidelines to the Truckee Meadows Project is shown. The Truckee Meadows Project provides a 100 year level of flood protection through the Reno-Sparks, Nevada metropolitan area along an approximate ten mile reach of the Truckee River. Major features of the project include levees, floodwalls, channel modifications, bridge replacement or reconstruction, a detention basin, and drainage improvements. The project is presently in the Preconstruction, Engineering and Design (PED) Phase within the Sacramento …

Go to article

Removal Of Extremely Low Levels Of Munitions In A Drinking Water Supply, R. Mark Bricka, Wayne Sharp Jan 1992

Removal Of Extremely Low Levels Of Munitions In A Drinking Water Supply, R. Mark Bricka, Wayne Sharp

United States Army: Publications

Past military operations have resulted in the contamination of soils by chemical munitions such as RDX, HMX and TNT (contaminant description, page 2) . The migration of water through the soils can transport the contaminants into groundwater and contaminate drinking water sources . Many military munitions are known or suspected to be carcinogenic and, therefore, must be removed from drinking water .

Go to article

Analyses Of Special Hazards And Flooding Problems In Tropical Island Environments, Robert C. Macarthur, Douglas L. Hamilton, Michael D. Harvey, Hudson W. Kekaula Jan 1992

Analyses Of Special Hazards And Flooding Problems In Tropical Island Environments, Robert C. Macarthur, Douglas L. Hamilton, Michael D. Harvey, Hudson W. Kekaula

United States Army: Publications

Data and results summarized in this paper show that development of urban projects and design of flood control works in tropical island catchments must consider clear water flooding as well as special hazards such as landslides, flow bulking, high sediment concentrations, mud and debris flows and flow avulsions. The needs for and methods to estimate peak flows, event volumes and the potential extent and depths of flooding during severe storm events in urbanizing tropical environments are described.

Go to article

Contaminant Groundwater Interception - Rma, S. Paul Miller, William L. Murphy Jan 1992

Contaminant Groundwater Interception - Rma, S. Paul Miller, William L. Murphy

United States Army: Publications

Resolution of groundwater contamination is the major environmental concern at most contamination sites. At some sites immediate control is required to prevent further damage. This paper describes a pioneer groundwater interception and treatment system developed and evaluated at a major Army installation.

Go to article

Hydraulic Risk Of Flood Disaster Reduction At Dams, Shou-Shan Fan Jan 1992

Hydraulic Risk Of Flood Disaster Reduction At Dams, Shou-Shan Fan

United States Department of Energy: Publications

Floods are major natural hazards, not totally predictable and manageable, at least at the present time. We believe that floods, no matter how violent, need not cause major damage. Loss of lives can be prevented and economic catastrophe minimized if a decision maker has accurate prior information on major flood characteristics, such as the magnitude and arrival time of the flood and its potential damages.

Go to article

Master Of Science In Computer Science Computer Information Systems 1992-1993 Catalog, Nova Southeastern University Jan 1992

Master Of Science In Computer Science Computer Information Systems 1992-1993 Catalog, Nova Southeastern University

College of Engineering and Computing Course Catalogs

No abstract provided.

Go to article

Master Of Science In Computer-Based Learning 1992-1993 Catalog, Nova Southeastern University Jan 1992

Master Of Science In Computer-Based Learning 1992-1993 Catalog, Nova Southeastern University

College of Engineering and Computing Course Catalogs

No abstract provided.

Go to article

Center For Computer And Information Sciences Application Package, Nova Southeastern University Jan 1992

Center For Computer And Information Sciences Application Package, Nova Southeastern University

College of Engineering and Computing Course Catalogs

No abstract provided.

Go to article

Doctor Of Science In Computer Information Systems 1992-1993 Catalog, Nova Southeastern University Jan 1992

Doctor Of Science In Computer Information Systems 1992-1993 Catalog, Nova Southeastern University

College of Engineering and Computing Course Catalogs

No abstract provided.

Go to article

Doctoral Program In Computing Technology Specialization In Computer Education, Information Sciences, Training And Learning 1992-1993 Catalog, Nova Southeastern University Jan 1992

Doctoral Program In Computing Technology Specialization In Computer Education, Information Sciences, Training And Learning 1992-1993 Catalog, Nova Southeastern University

College of Engineering and Computing Course Catalogs

No abstract provided.

Go to article

Doctor Of Education Specialization In Computing And Information Technology 1992-1993, Nova Southeastern University Jan 1992

Doctor Of Education Specialization In Computing And Information Technology 1992-1993, Nova Southeastern University

College of Engineering and Computing Course Catalogs

No abstract provided.

Go to article

Center For Computer And Information Sciences--Doctor Of Science In Computer Information Systems 1992-93, Nova Southeastern University Jan 1992

Center For Computer And Information Sciences--Doctor Of Science In Computer Information Systems 1992-93, Nova Southeastern University

College of Engineering and Computing Course Catalogs

No abstract provided.

Go to article

Energy-Related Feature Abstraction For Handwritten Digit Recognition, Thomas H. Fuller Jr. Jan 1992

Energy-Related Feature Abstraction For Handwritten Digit Recognition, Thomas H. Fuller Jr.

All Computer Science and Engineering Research

Most handwritten character recognizers use either graphical (static) or first-order dynamic data. Our research speculates that the mental signal to write a digit might be partially encoded as an energy profile. We used artificial neural networks (ANN) to analyze energy-related features (first and second time derivatives) of handwritten digits of 20 subjects and later 40 subjects. An experimenal environment was developed on a NeXTstation with a real-time link to a pen-based GO computer. Although such an experiment cannot confirm an energy profile encoded in the writer, it did indicate the usefulness of energy-related features by recognizing 94.5% of the 600 …

Go to article

Consideration Of Phase Transformations In The Study Of Shear Bands In A Dynamically Loaded Steel Block, Z. G. Zhu, R. C. Batra Jan 1992

Consideration Of Phase Transformations In The Study Of Shear Bands In A Dynamically Loaded Steel Block, Z. G. Zhu, R. C. Batra

Mechanical and Aerospace Engineering Faculty Research & Creative Works

We study plane strain thermomechanical deformations of a square block made of steel and model a material defect in it by a rigid non-heat-conducting ellipsoidal inclusion located at the center of the block. The boundaries of the block are presumed to be thermally insulated, and its top and bottom surfaces compressed vertically at a prescribed rate. The loading pulse is assumed to be made up of three parts; an initial segment in which the speed increases from zero to the steady value, the steady part, and the third part in which the speed decreases gradually to zero and is maintained …

Go to article

X‐Ray Powder Diffraction Structural Phase‐Transition Study Of La(Cr1‐Xmnx)O3 (X = 0 To 0.25) Using The Rietveld Method Of Analysis, Scott A. Howard, Jen‐Kuan ‐K Yau, Harlan U. Anderson Jan 1992

X‐Ray Powder Diffraction Structural Phase‐Transition Study Of La(Cr1‐Xmnx)O3 (X = 0 To 0.25) Using The Rietveld Method Of Analysis, Scott A. Howard, Jen‐Kuan ‐K Yau, Harlan U. Anderson

Materials Science and Engineering Faculty Research & Creative Works

The La(Cr1‐xMnx)O3 (x = 0 to 0.25) system exhibited a displacive phase transformation from an orthorhombic to a rhombohedral structure at temperatures ranging from about 256°C at x= 0 to 305°C at x= 0.25. The Rietveld method of X‐ray analysis was used to determine structural characteristics and to assay phase concentrations when multiple phases were present. Indications were that the Mn ions on the B site affected the transition temperature through an ionic size effect; i.e., Mn3+, with a larger ionic size than Cr3+, increased the transition temperature while the presence …

Go to article

Mixed‐Cation Oxide Powders Via Resin Intermediates Derived From A Water‐Soluble Polymer, Lone‐Wen ‐W Tai, Harlan U. Anderson, Paul A. Lessing Jan 1992

Mixed‐Cation Oxide Powders Via Resin Intermediates Derived From A Water‐Soluble Polymer, Lone‐Wen ‐W Tai, Harlan U. Anderson, Paul A. Lessing

Materials Science and Engineering Faculty Research & Creative Works

Sub micrometer powders of complex oxides were prepared via resin intermediates based on a starch type of organic precursor. A commercially available water‐soluble starch derivative was (for the first time) used as the organic base for solution synthesis of ceramic powders. Calcination of the charred, fluffy, amorphous resins at a temperature below 600°C for 4 h yielded perovskite powders of Sr‐doped LaMnO3 and Sr‐doped La(Fe,Co)O3. Sr‐doped LaCrO3 needed to be calcined above 750°C to ensure phase purity and to remove organic residue. Due to the low cost of starch derivatives, the process has the potential of …

Go to article

Sme Annual Meeting. Phoenix, Usa. February 22-27, 1992, Johh L. Watson Jan 1992

Sme Annual Meeting. Phoenix, Usa. February 22-27, 1992, Johh L. Watson

Materials Science and Engineering Faculty Research & Creative Works

No abstract provided.

Go to article

Solvent Extraction Reagent Entrainment Effects On Zinc Electrowinning From Waste Oxide Leach Solutions, M. Neira, Thomas J. O'Keefe, Johh L. Watson Jan 1992

Solvent Extraction Reagent Entrainment Effects On Zinc Electrowinning From Waste Oxide Leach Solutions, M. Neira, Thomas J. O'Keefe, Johh L. Watson

Materials Science and Engineering Faculty Research & Creative Works

A considerable quantity of metal-containing waste oxide is generated by the primary metal industry, and under increased environmental regulation, treatment of these wastes has become viable. Hydrometallurgical processing is often appropriate and one potential treatment process for zinc oxide wastes involves leaching the oxide with an acid, purifying by a solvent extraction operation, and recovering metallic zinc by electrowinning the purified leach solution. The purification stage is frequently critical and the introduction of a solvent extraction organic reagent into the flowsheet can be detrimental to downstream processes. The object of this study was to determine the effect of organics, entrained …

Go to article

Review Of P-Type Doped Perovskite Materials For Sofc And Other Applications, Harlan U. Anderson Jan 1992

Review Of P-Type Doped Perovskite Materials For Sofc And Other Applications, Harlan U. Anderson

Materials Science and Engineering Faculty Research & Creative Works

p-type perovskite-type oxides are candidates for use as components of high temperature fuel cells and as oxygen separation membranes. The particular properties that these applications require are reviewed. The characteristics that these oxides have which allow them to satisfy many of these requirements are discussed and a defect model presented. The status of the utilization of these oxides and of the areas which need to be addressed such as thermal expansion and sintering characteristics are reviewed. © 1992.

Go to article

Effect Of Cation Substitution On The Thermal Expansion Coefficient Of Lacro3, R. Koc, Harlan U. Anderson Jan 1992

Effect Of Cation Substitution On The Thermal Expansion Coefficient Of Lacro3, R. Koc, Harlan U. Anderson

Materials Science and Engineering Faculty Research & Creative Works

No abstract provided.

Go to article

Coperite-Computer-Aided Tool For Power Engineering Research, Instruction, Training And Education, Badrul H. Chowdhury, D. E. Clark Jan 1992

Coperite-Computer-Aided Tool For Power Engineering Research, Instruction, Training And Education, Badrul H. Chowdhury, D. E. Clark

Electrical and Computer Engineering Faculty Research & Creative Works

A graphics-oriented, primarily PC-based tool for education, research, and training in power engineering is introduced. The tool, called COPERITE, has all user interfaces resident on an IBM-386 microcomputer. Menus and windows are used for the interface, and attractive graphical representations and displays are included. Application programs that are interfaced are power flow, contingency analysis, economic dispatch, security-constrained dispatch, system stability, and fault analysis. These programs are executed on a VAX 8800 computer mainly for speed of execution. Information exchange between the PC and the VAX is made through an Ethernet connection which is transparent to the user. Results of execution …

Go to article

Test 1662: John Deere 5400 Diesel 9-Speed, Nebraska Tractor Test Lab Jan 1992

Test 1662: John Deere 5400 Diesel 9-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 …

Go to article

Test 1659: Case International 9270 And Steiger 9270 Manual Diesels 12-Speed, Nebraska Tractor Test Lab Jan 1992

Test 1659: Case International 9270 And Steiger 9270 Manual Diesels 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 …

Go to article

Nebraska Summary: S126 Massey Ferguson 3690, Nebraska Tractor Test Lab Jan 1992

Nebraska Summary: S126 Massey Ferguson 3690, Nebraska Tractor Test Lab

Nebraska Tractor Tests

ABOUT THE TEST REPORT AND USE OF THE DATA The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data. EXPLANATION OF THE TEST PROCEDURES Purpose The purpose of …

Go to article

Nebraska Summary: S165 Ford 8340 16x16, Nebraska Tractor Test Lab Jan 1992

Nebraska Summary: S165 Ford 8340 16x16, Nebraska Tractor Test Lab

Nebraska Tractor Tests

ABOUT THE TEST REPORT AND USE OF THE DATA The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data. EXPLANATION OF THE TEST PROCEDURES Purpose The purpose of …

Go to article

Nebraska Summary: S164 Ford 8240 16x16, Nebraska Tractor Test Lab Jan 1992

Nebraska Summary: S164 Ford 8240 16x16, Nebraska Tractor Test Lab

Nebraska Tractor Tests

ABOUT THE TEST REPORT AND USE OF THE DATA The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data. EXPLANATION OF THE TEST PROCEDURES Purpose The purpose of …

Go to article

First Prev Next Last