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1999

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Articles 1 - 30 of 1269

Full-Text Articles in Engineering

Behavior Of Gamma Tial Subjected To Impact Damage And Elevated Temperature Fatigue, Trevor S. Harding, J. Wayne Jones Dec 1999

Behavior Of Gamma Tial Subjected To Impact Damage And Elevated Temperature Fatigue, Trevor S. Harding, J. Wayne Jones

Materials Engineering

Gamma titanium aluminide has received significant attention in recent years as a candidate material for use in aerospace and industrial gas turbine engine applications. In particular, these materials offer significant weight reductions (densities are less than half that of nickel-based superalloys), high specific strength retention at elevated temperature and high specific stiffness which is particularly important in vibrating components such as blades. This combination of weight savings and good mechanical properties has led to the possibility that γ-TiAl may be a suitable replacement for nickel-based alloys, such as Inconel 718, in low pressure turbine blades without significant redesign of the ...


Method And System For Gas Metal Arc Welding, Yuming Zhang, Liguo E Dec 1999

Method And System For Gas Metal Arc Welding, Yuming Zhang, Liguo E

Electrical and Computer Engineering Faculty Patents

An improved method of gas metal arc welding (GMAW) is disclosed. The method includes utilizing a pulsed current having a variable waveform to ensure the detachment of one-droplet-per-pulse of current. During the welding process, the current is sufficient to produce a droplet at the end of a consumable electrode wire. After the droplet reaches a desired size, the current is lowered to induce an oscillation in the droplet. The current is then increased which, in combination with the momentum created by the oscillation, effects droplet detachment. The oscillation may be monitored by observing the arc voltage to determine a preferred ...


Lead-Free Interconnection For Electronic Devices, Ravi F. Saraf Dec 1999

Lead-Free Interconnection For Electronic Devices, Ravi F. Saraf

Patents Held by Members of the Department of Chemical and Biomolecular Engineering

An electronic device that is equipped with a plurality of bonding pads positioned on the device for making electrical interconnections and electrically conductive composite bumps adhered to the bonding pads wherein the bumps are formed of a composite material consisting of a thermoplastic polymer and at least about 30 volume percent of conductive metal particles based on the total volume of the metal particles and the thermoplastic polymer. The present invention is also directed to a method of making electrical interconnections to an electronic device by pressing a plurality of composite bumps of a polymeric based material against a substrate ...


Teen Choice Awards 2019 Live Stream Online Free, Teen Choice Awards Dec 1999

Teen Choice Awards 2019 Live Stream Online Free, Teen Choice Awards

Teen Choice Awards

Watch Teen Choice Awards 2019 Live Stream Online Free now. At the point when Taylor Swift gets the debut Icon Award at the Teen Choice Awards in Hermosa Beach on Sunday, Aug. 11, she'll stroll off the phase with an uncommon trophy, on account of surfboard shaper and Spyder organizer Dennis Jarvis.

The Hermosa Beach-based retailer Spyder Surf was contracted just because as the surfboard producer for the Teen Choice Awards. There will be more than 20 of the sheets gave out including Swift's which highlights a photograph of the whiz's felines.

Quick's Scottish crease felines ...


Near-Band-Gap Cupt-Order-Induced Birefringence In Al0.48Ga0.52Inp2, Mathias Schubert, Tino Hofmann, Bernd Rheinlander, Ines Pietzonka, Torsten Sass, Volker Gottschalch, John A. Woollam Dec 1999

Near-Band-Gap Cupt-Order-Induced Birefringence In Al0.48Ga0.52Inp2, Mathias Schubert, Tino Hofmann, Bernd Rheinlander, Ines Pietzonka, Torsten Sass, Volker Gottschalch, John A. Woollam

Faculty Publications from the Department of Electrical and Computer Engineering

The order-induced birefringence in the near-band-gap spectral range (0.75 to 2.5 eV), and its dependence on the degree of ordering η is reported for Al0.48Ga0.52InP2. Transmission and reflection generalized variable angle spectroscopic ellipsometry, dark-field spectroscopy, and cross-polarized reflectance difference spectroscopy (CRDS) are used to determine precisely the room-temperature dielectric functions for polarization parallel and perpendicular to the ordering direction of a series of spontaneously CuPt-ordered samples grown by metalorganic vapor-phase epitaxy. The CRDS technique is introduced as an approach to sense extremely weak anisotropy at oblique angles of incidence. The observed ...


Quasicrystalline Nature Of Quasicrystal Surfaces: A Photoemission Study, D. Naumović, P. Aebi, :L. Schlapbach, C. Beeli, Thomas A. Lograsso, Dwight W. Delaney Dec 1999

Quasicrystalline Nature Of Quasicrystal Surfaces: A Photoemission Study, D. Naumović, P. Aebi, :L. Schlapbach, C. Beeli, Thomas A. Lograsso, Dwight W. Delaney

Ames Laboratory Publications

Differently prepared surfaces of quasicrystalline i-Al-Pd-Mn are analyzed using angle-resolved photoemission in the x-ray andultraviolet range of photon energies. Depending on the preparation, we find both surfaces with crystalline structure and metallic character, and surfaces with quasicrystalline structural fingerprints and a suppressed density of states at the Fermi level, compatible with a pseudogap.


United States Patent: Method And System For Estimating The Tenderness Of A Meat Product, Maria Victoria Spadaro, Rosana Moreira, Jimmy Keeton, D. H. Allen Dec 1999

United States Patent: Method And System For Estimating The Tenderness Of A Meat Product, Maria Victoria Spadaro, Rosana Moreira, Jimmy Keeton, D. H. Allen

Faculty Publications from the Department of Engineering Mechanics

A method for estimating the tenderness of a meat product is provided. The method includes determining the stress relaxation coefficient of a meat sample. One or more physical parameters of the meat sample are then determined from the stress relaxation coefficient. Diagnostic sensory characterization data, such as a numerical estimation of the meat's overall tenderness, is then determined for the meat sample. The physical parameters are then correlated to the diagnostic sensory characterization data, to allow the diagnostic sensory characterization data to be estimated solely from the measured physical parameters.


Method For Testing Field Programmable Gate Arrays, Charles E. Stroud, Miron Abramovici Dec 1999

Method For Testing Field Programmable Gate Arrays, Charles E. Stroud, Miron Abramovici

Electrical and Computer Engineering Faculty Patents

A method of testing field programmable gate arrays (FPGAs) includes the step of configuring programmable logic blocks of the FPGAs for completing a built-in self-test. This is followed by the steps of initiating the built-in self-test, generating test patterns with the programmable logic blocks and analyzing a resulting response to produce a pass/fail indication with the programmable logic blocks. More specifically, the configuring step includes establishing a first group of programmable logic blocks as test pattern generators and output response analyzers and a second group of programmable logic blocks as blocks under test. The blocks under test are then ...


Method For Providing Discharge Protection Or Shielding, Ravi F. Saraf Dec 1999

Method For Providing Discharge Protection Or Shielding, Ravi F. Saraf

Patents Held by Members of the Department of Chemical and Biomolecular Engineering

Electrostatic discharge protection or electromagnetic interference shielding is provided by applying a composition comprising a thermoset or thermoplastic polymeric matrix, and a conductive filler component, where said filler component comprises electrically conductive particles and at least one conducting polymer to a dielectric substrate.


Development Of Rear-End Collision Avoidance In Automobiles, Uttamkumar Dravidam Dec 1999

Development Of Rear-End Collision Avoidance In Automobiles, Uttamkumar Dravidam

FIU Electronic Theses and Dissertations

The goal of this work is to develop a Rear-End Collision Avoidance System for automobiles. In order to develop the Rear-end Collision Avoidance System, it is stated that the most important difference from the old practice is the fact that new design approach attempts to completely avoid collision instead of minimizing the damage by over-designing cars. Rear-end collisions are the third highest cause of multiple vehicle fatalities in the U.S. Their cause seems to be a result of poor driver awareness and communication. For example, car brake lights illuminate exactly the same whether the car is slowing, stopping or ...


Design And Implementation Of A Web Based Shop Floor Control System To Maintain Schedule Feasibility In A Dynamic Job Shop Environment, Anil Bommakanti Dec 1999

Design And Implementation Of A Web Based Shop Floor Control System To Maintain Schedule Feasibility In A Dynamic Job Shop Environment, Anil Bommakanti

FIU Electronic Theses and Dissertations

The effective control of production activities in dynamic job shop with predetermined resource allocation for all the jobs entering the system is a unique manufacturing environment, which exists in the manufacturing industry. In this thesis a framework for an Internet based real time shop floor control system for such a dynamic job shop environment is introduced. The system aims to maintain the schedule feasibility of all the jobs entering the manufacturing system under any circumstance. The system is capable of deciding how often the manufacturing activities should be monitored to check for control decisions that need to be taken on ...


Aviation Disaster Primer: Psychologies Of Error, Ibpp Editor Dec 1999

Aviation Disaster Primer: Psychologies Of Error, Ibpp Editor

International Bulletin of Political Psychology

This article describes common psychological phenomena that often mitigate against accurate induction and deduction of the causes of aviation disasters.


Trends. The Egyptair 990 Crash: A Misconception About Psychological Screening, Ibpp Editor Dec 1999

Trends. The Egyptair 990 Crash: A Misconception About Psychological Screening, Ibpp Editor

International Bulletin of Political Psychology

The article discusses the common, publicly promulgated misconception about psychological screening of pilots and other aircrew members in the aftermath of the EgyptAir 990 crash.


Solid Manure Application: Toward A Sophisticated Spreader, Tom L. Richard, Mark Hanna Dec 1999

Solid Manure Application: Toward A Sophisticated Spreader, Tom L. Richard, Mark Hanna

Proceedings of the Integrated Crop Management Conference

Two generations of low-cost chemical fertilizer and the differentiation of crop from livestock farming have given manure a bad name, even among farmers. With increasing awareness and concern about the air and water impacts of improper manure management, it is imperative that both crop and livestock farmers once again consider manure as a resource rather than a waste (Fleming et al., 1998). To fully realize these benefits will require some changes in farming systems, technologies, and practices, and regulation is likely to be an even larger factor driving these changes than it is today. But unless these strategies generate on-farm ...


Weed Sensing - Where Are We?, Brian L. Steward Dec 1999

Weed Sensing - Where Are We?, Brian L. Steward

Proceedings of the Integrated Crop Management Conference

Recognition of the potential benefits of being able to variably apply herbicides based on the sensing of weeds has led to much research and development activity. The purpose of this paper is to survey what work has been done already with a view of formulating future research and development directions with a goal of the development of practical weed sensing technology. Two approaches have typically been used for weed detection. The first is the photo-detection approach, which measures the average reflected light from the field of view of the detector. Light-detecting (photo) diodes or resistors have been used in this ...


Crop Rotation Effects On N03-N Leaching And Corn Yields Under Manure Management Practices, R. S. Kanwar, D. L. Karlen, C. A. Cambardella, C. Pederson Dec 1999

Crop Rotation Effects On N03-N Leaching And Corn Yields Under Manure Management Practices, R. S. Kanwar, D. L. Karlen, C. A. Cambardella, C. Pederson

Proceedings of the Integrated Crop Management Conference

Nonpoint source nutrient pollution is recognized as an important environmental and social issue for several reasons. First, manure from swine production facilities can have serious impacts on the quality of surface and ground water resources. Second, several states are in the process of creating laws to reduce nitrogen and phosphorus loadings from manure to soil and water resources. Third, pollution of water resources from nutrients supplied by manure to croplands will set parameters for developing public policies on the management of manure.


Testing And Handling Gmo And Non-Gmo Grains, Charles R. Hurburgh Jr. Dec 1999

Testing And Handling Gmo And Non-Gmo Grains, Charles R. Hurburgh Jr.

Proceedings of the Integrated Crop Management Conference

In April, 1999, the three largest US com processors, Cargill, Archer-Daniels-Midland, and AE Staley announced that they would not accept corn from hybrids that had genetic modifications not yet approved for sale in the European Union (EU) (www.grainnet.com/BreakingNews/articles.html?ID=3581). While the USA sells little whole com to Europe, it does export com gluten products to the EU. Gluten feed and meal are produced from the protein and bran fractions of com after starch has been extracted in a wet mill plant. This statement affected an estimated 3-7% of the com about to be planted ...


Equipment Effects On Anhydrous Ammonia Application, H. Mark Hanna, Michael L. White Dec 1999

Equipment Effects On Anhydrous Ammonia Application, H. Mark Hanna, Michael L. White

Proceedings of the Integrated Crop Management Conference

Nitrogen fertilizer is a major input in terms of cost and energy into production of com, wheat, and other nationally important crops such as cotton and rice. Anhydrous ammonia is the most popular form of nitrogen application. In Iowa, 623,000 tons of anhydrous ammonia were applied in 1997 (Terry and Kirby, 1997). In the United States, 4.9 million tons of anhydrous ammonia were applied in both 1996 and 1997. Comparing fertilizer usage by source, anhydrous ammonia supplied 1.0 billion pounds of N (nitrogen) to Iowa cornfields in 1997 while the next most popular source, nitrogen solutions, supplied ...


Phosphorus And Surface Water Quality, James L. Baker Dec 1999

Phosphorus And Surface Water Quality, James L. Baker

Proceedings of the Integrated Crop Management Conference

With increased concentration of livestock numbers and operations into smaller geographic areas, particularly confinement animal feeding operations (CAFOS) for cattle and swine (and also poultry), there are concerns surrounding the impacts of animal agriculture on the quality of our natural resources. Storage and land application management practices of manure generated by these operations can affect air and water quality. Manure management plans written to provide nutrients at rates necessary for crop production can sometimes result in over application of phosphorus (P) when the rate of manure application is based on the nitrogen (N) needs of the crop/rotation. This is ...


12. Pierre Sigwalt, Otto Vogl Dec 1999

12. Pierre Sigwalt, Otto Vogl

Emeritus Faculty Author Gallery

No abstract provided.


17th International Herman F. Mark Symposium: Polypropylene - A Material Of The Future, Otto Vogl, Helga Roder Dec 1999

17th International Herman F. Mark Symposium: Polypropylene - A Material Of The Future, Otto Vogl, Helga Roder

Emeritus Faculty Author Gallery

No abstract provided.


A Summary Of Highway Revenues, Distributions, & Expenses For Indiana Counties, Cities & Towns 1999, John Habermann Dec 1999

A Summary Of Highway Revenues, Distributions, & Expenses For Indiana Counties, Cities & Towns 1999, John Habermann

Indiana Local Technical Assistance Program (LTAP) Publications

This report provides information on revenues, distributions, and expenses of state and local governments for highway, road, and street work. Since the Motor Vehicle Highway (MVH) and Local Road and Street (LRS) Accounts are the principal source of funds for local road or street construction and maintenance operations, this summary may be used to see the trends in income sources and in the expenses charged to the funds prior to their being distributed to the highway, road, and street agencies.


Acuta Enews December 1999, Vol.28, No. 12 Dec 1999

Acuta Enews December 1999, Vol.28, No. 12

ACUTA Newsletters

In This Issue

ACUTA to Recognize Member's Web Sites

ACUTA EVENTS

ACUTA Announces Online Legislative & Regulatory Affairs Newsletter

DC Update

Overheard on the Listserve............. Directory Assistance Direct Connect

Board Report

Welcome New Members

Positions Available


Parametric Study Of Unsaturated Drainage Layers In A Capillary Barrier, C. E. Morris, J. C. Stormont Dec 1999

Parametric Study Of Unsaturated Drainage Layers In A Capillary Barrier, C. E. Morris, J. C. Stormont

Faculty of Engineering - Papers (Archive)

Unsaturated drainage layers (UDLs) have been demonstrated to greatly increase the lateral diversion capacity of capillary barriers. The inclusion of a UDL allows native soils suitable for vegetation growth to be used as the finer soil as lateral drainage properties of the layer no longer need to be considered. A comprehensive numerical study was conducted to investigate the influence of the interface slope and the UDL material on the system’s ability to laterally divert downward moving moisture. A capillary barrier system with and without a UDL was simulated for 10 years using daily varying climatic data for three locations ...


Development Of Cfd Algorithms For Transient And Steady Aerodynamics, Fergal Boyle [Thesis] Dec 1999

Development Of Cfd Algorithms For Transient And Steady Aerodynamics, Fergal Boyle [Thesis]

Other Resources

Research carried out in the United States and in Europe over the last 20 years has led to the development of the advanced propeller, a small-diameter, highly-loaded, multi-bladed, swept, variable-pitch propeller, that can achieve potential fuel savings of 30% over an equivalent technology turbofan engine at competitive speed and altitudes.

In this work an implicit finite-volume algorithm is developed for predicting the transient flow around an advanced propeller under asymmetric inflow conditions. The development of the unsteady propeller algorithm evolves from a family of methods for progressively more complex applications. In total six algorithms are developed: three steady and three ...


Comparison Of One-Dimensional And Two-Dimensional Hydrodynamic Modeling Approaches For Red River Basin, Sajjad Ahmad, Slobodan P. Simonovic Dec 1999

Comparison Of One-Dimensional And Two-Dimensional Hydrodynamic Modeling Approaches For Red River Basin, Sajjad Ahmad, Slobodan P. Simonovic

Civil & Environmental Engineering and Construction Faculty Publications

EXECUTIVE SUMMARY

A devastating flood in Red River valley in 1997 emphasized the need to study the flood control measures in the Red River basin using state of the art modeling tools. The Red River and its floodplains can be modeled using one-dimensional, quasi two-dimensional or fully two-dimensional hydrodynamic models. Each modeling approach has its own advantages and limitations. The main purpose of this report is a comparison between one-dimensional (or quasi two dimensional) and fully two-dimensional hydrodynamic modeling approaches for modeling floods in the Red River basin.

A two-dimensional hydrodynamic model, MIKE 21, coupled with Geographic Information System (GIS ...


Work In Progress: Automating Proportion/Period Scheduling, David Steere, Jonathan Walpole, Calton Pu Dec 1999

Work In Progress: Automating Proportion/Period Scheduling, David Steere, Jonathan Walpole, Calton Pu

Computer Science Faculty Publications and Presentations

The recent effort to define middleware capable of supporting real-time applications creates the opportunity to raise the level of abstraction presented to the programmer. We propose that proportion/period is a better abstraction for specifying resource needs and allocation than priorities. We are currently investigating techniques to address some issues that are restricting use of proportion/period scheduling to research real-time prototypes. In particular, we are investigating techniques to automate the task of selecting proportion and period, and that allow proportion/period to incorporate job importance under overload conditions.


Public Perceptions Of The Midwest’S Pavements - Iowa - Phase Ii (State Wide Survey Report), Marquette University Research Team, Transportation Research Center Dec 1999

Public Perceptions Of The Midwest’S Pavements - Iowa - Phase Ii (State Wide Survey Report), Marquette University Research Team, Transportation Research Center

Transportation Research Center: Public Perception of Midwest Pavements

This report covers Phase II of a three-phase pooled-fund project in Wisconsin, Iowa and Minnesota, to determine the perception/satisfaction levels of the driving public and how they correlate with the states’ physical data bases used to determine priorities for pavement improvements on rural, two-lane highways. In addition, policy issues of trust and improvement trade-offs are addressed.

In Phase I, six focus groups were conducted in each state to determine the beliefs and issues about pavements that could be used to draft statewide questionnaires. Focus groups were held during the last half of 1996 in all three states. From the ...


Prediction Of Lake-Level Changes For Various Climatic Scenarios Using A Water-Balance Model, Waubay Lakes Chain, Northeastern South Dakota (Task 2), Northern Great Plains Water Resources Research Center, Patrick J. Emmons Dec 1999

Prediction Of Lake-Level Changes For Various Climatic Scenarios Using A Water-Balance Model, Waubay Lakes Chain, Northeastern South Dakota (Task 2), Northern Great Plains Water Resources Research Center, Patrick J. Emmons

Civil and Environmental Engineering Reports and Manuals

From the Executive Summary:

The closed basins area, which includes parts of Day, Marshall, Roberts, Codington, and Clark Counties, in northeastern South Dakota, was declared a Federal Disaster Area in 1990. Under the sponsorship of Region 8 of the Federal Emergency management Agency, an interagency study team was formed to conduct an interdisciplinary scientific investigation of the flooding n the closed basins area. Agencies represented include Federal Emergency Management Agency, U.S. Geological Survey, U.S. Army Corp of Engineers, South Dakota State University, Natural Resources Conservation Service, South Dakota Department of Environment and Natural Resources, and the South Dakota ...


Intervals (Pairs Of Fuzzy Values), Triples, Etc.: Can We Thus Get An Arbitrary Ordering?, Vladik Kreinovich, Masao Mukaidono Dec 1999

Intervals (Pairs Of Fuzzy Values), Triples, Etc.: Can We Thus Get An Arbitrary Ordering?, Vladik Kreinovich, Masao Mukaidono

Departmental Technical Reports (CS)

Traditional fuzzy logic uses real numbers as truth values. This description is not always adequate, so in interval-valued fuzzy logic, we use pairs (t-,t+) of real numbers, t-<=t+, to describe a truth value. To make this description even more adequate, instead of using real numbers to described each value t- and t+, we can use intervals, and thus get fuzzy values which can be described by 4 real numbers each. We can iterate this procedure again and again. The question is: can we get an arbitrary partially ordered set in this manner? An arbitrary lattice? In this paper, we show that although we cannot thus generate arbitrary lattices, we can actually generate an arbitrary partially ordered set in this manner. In this sense, the "intervalization" operation is indeed universal.