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

Digital Commons Network

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

PDF

Iowa State University

1997

Engineering

Keyword
Publication
Publication Type

Articles 1 - 30 of 324

Full-Text Articles in Entire DC Network

Method Of Evaluating The Vibration Characteristics Of A Sporting Implement Such As A Golf Club, Kenneth G. Mcconnell, Guy M. Houser Dec 1997

Method Of Evaluating The Vibration Characteristics Of A Sporting Implement Such As A Golf Club, Kenneth G. Mcconnell, Guy M. Houser

Iowa State University Patents

A method of evaluating the vibration characteristics of a golf club comprises identifying the natural frequencies of vibration of the golf club through a pseudorandom vibrational excitation of the club. The club is then excited at least at some of the identified natural frequencies and the club head is observed under a strobe light to identify and locate on the face of the club head the node lines corresponding to the vibrational mode shape for these natural frequencies. The intersection pattern of the node lines as observed and mapped on the club face and the offset of this pattern from ...


Carbon Or Boron Modified Titanium Silicide, Andrew J. Thome, Mufit Akinc Dec 1997

Carbon Or Boron Modified Titanium Silicide, Andrew J. Thome, Mufit Akinc

Iowa State University Patents

A titanium silicide material based on Ti.sub.5 Si.sub.3 intermetallic compound exhibits substantially improved oxidative stability at elevated temperatures. In particular, carbon is added to a Ti.sub.5 Si.sub.3 base material in an amount (e.g. about 0.3 to about 3.6 weight % C) effective to impart substantially improved oxidative stability at elevated temperatures, such as about 1000 Si.sub.3 base material in an amount (e.g. about 0.3 to about 3.3 weight % B) to this same end.


Simulating Nitrogen Management Effects Of Subsurface Drainage Water Quality, A S. Azevedo, P. Singh, Ramesh S. Kanwar, Lajpat R. Ahuja Dec 1997

Simulating Nitrogen Management Effects Of Subsurface Drainage Water Quality, A S. Azevedo, P. Singh, Ramesh S. Kanwar, Lajpat R. Ahuja

Agricultural and Biosystems Engineering Publications

Increased level of NO3-N in the drinking water supplies is a major health concern these days. The long-term effects of actual nitrogen (N) fertilizer management practices are not well understood. The use of computer models allows the simulation of different N management practices on a long-term basis and their related effects on water quality. The RZWQM (Root Zone Water Quality Model, Version 3.0) was used to simulate the long-term (1978–1992) impacts of N management practices (single N applications at 50, 100, 150, and 200 kg per ha; and single and split N applications at 150 and ...


Effects Of Swine Manure Management Options On Groundwater Quality, Thad Hardeman Nov 1997

Effects Of Swine Manure Management Options On Groundwater Quality, Thad Hardeman

Proceedings of the Integrated Crop Management Conference

In 1994, there were 31 hog farms across the United States owning at least 10,000 sows and in 1995, there were 44 (Freese, 1994). This increasing number of large hog farms is evidence of the growing swine industry. This growth, however, has independent farmers, neighbors, environmentalists, and legislators in a quandary as to how the industry will evolve. These growing pains are of both an economic and environmental nature. Many topics need to be addressed as the production expands. One of the primary concerns of the growing hog industry is the issue of swine (Sus spp.) manure production.


Manue Application Effects On Residue, Odor, And Placement, H. Mark Hanna, Dwaine S. Bundy, Jeffery C. Lorimor, Steven K. Mickelson, Stewart W. Melvin Nov 1997

Manue Application Effects On Residue, Odor, And Placement, H. Mark Hanna, Dwaine S. Bundy, Jeffery C. Lorimor, Steven K. Mickelson, Stewart W. Melvin

Proceedings of the Integrated Crop Management Conference

Field experiments in no-till soybean and corn residue were conducted to evaluate six liquid swine manure application methods. The methods were injection with a conventional knife or sweep, incorporation with tandem disk after broadcast application, broadcast application, injection with a narrow-profile knife, and surface application behind row cleaners. The row cleaner and all injection treatments used finger-closing wheels. Air samples over the soil surface were obtained during and after application and residue cover was measured. Odor level was measured by the amount of air dilutions to reach odor threshold. Placement of material into the soil was evaluated with dye. Incorporation ...


The Role Of Water Stress In Creating Spatial Yield Variability In Soybeans, William D. Batchelor, Joel O. Paz Nov 1997

The Role Of Water Stress In Creating Spatial Yield Variability In Soybeans, William D. Batchelor, Joel O. Paz

Proceedings of the Integrated Crop Management Conference

Recent advancements in yield monitors and global positioning systems that can create spatial yield maps has generated much excitement and controversy among farmers and researchers. Site-specific field management promises to maximize field level net return and minimize environmental impact by managing fields using spatially variable management practices. The success of site-specific field management depends upon discovery of relationships between environment, management, and resulting yield variability, and ultimately, how these relationships can be exploited to compute optimum prescriptions. Farmers are faced with trying to determine how to manage variability to improve profits. Researchers are trying to develop methods to analyze causes ...


Iowa State University Extension Iowa Grain Quality Initiative, Darren Jarboe, Charles R. Hurburgh Jr. Nov 1997

Iowa State University Extension Iowa Grain Quality Initiative, Darren Jarboe, Charles R. Hurburgh Jr.

Proceedings of the Integrated Crop Management Conference

The worldwide emphasis on quality management is beginning to affect grain marketing in that users are identifying specific attributes that have additional economic importance. The Iowa Grain Quality Initiative (IGQI), a consortium of producer, industry, government and university experts, was formed to assist in the development of user-driven marketing strategies. Value-added grains, grains that exceed normal commodity grain in user performance or function, will present a wide range of challenges for producers and handlers, but represent potential value increases of 10-30 cents per bushel, more in very specialized applications.


Compost Quality Considerations For Crop Utilization, Tom L. Richard Nov 1997

Compost Quality Considerations For Crop Utilization, Tom L. Richard

Proceedings of the Integrated Crop Management Conference

Over the past several years compost production has increased dramatically in the agricultural, industrial, and municipal sectors. This expansion has been driven by increasing solid waste management costs, heightened public enthusiasm for organic matter recycling, and recognition that composting provides a way to manage manures and other organic solid wastes in an environmentally sound manner.


Tools For Value-Added Grain Marketing, Benjamin R. Winborn, Charles R. Hurburgh Jr. Nov 1997

Tools For Value-Added Grain Marketing, Benjamin R. Winborn, Charles R. Hurburgh Jr.

Proceedings of the Integrated Crop Management Conference

Grain producers face many decisions each year concerning the practices they will engage in and the products they will use. Markets for grains in the United States and the world over are changing. Due to the availability of affordable and reliable testing, the value of intrinsic characteristics like oil and protein can be realized at receiving points. Once identified and preserved, value-added grains can be directed to the best end use. Soybean processors are measuring protein and oil levels as reflected in higher value of oil and meal. As demand for value-added commodities increases in the United States, seed companies ...


Production Method For Making Rare Earth Compounds, R. William Mccallum, Timothy W. Ellis, Kevin W. Dennis, Robert J. Hofer, Daniel J. Branagan Nov 1997

Production Method For Making Rare Earth Compounds, R. William Mccallum, Timothy W. Ellis, Kevin W. Dennis, Robert J. Hofer, Daniel J. Branagan

Iowa State University Patents

A method of making a rare earth compound, such as a earth-transition metal permanent magnet compound, without the need for producing rare earth metal as a process step, comprises carbothermically reacting a rare earth oxide to form a rare earth carbide and heating the rare earth carbide, a compound-forming reactant (e.g. a transition metal and optional boron), and a carbide-forming element (e.g. a refractory metal) that forms a carbide that is more thermodynamically favorable than the rare earth carbide whereby the rare earth compound (e.g. Nd.sub.2 Fe.sub.14 B or LaNi.sub.5) and ...


Hydrodynamics Of Dispersed Liquid Droplets In Agitated Synthetic Fibrous Slurries, Theodore J. Heindel, Feler Bose, S. Mostafa Ghiaasiaan Nov 1997

Hydrodynamics Of Dispersed Liquid Droplets In Agitated Synthetic Fibrous Slurries, Theodore J. Heindel, Feler Bose, S. Mostafa Ghiaasiaan

Theodore J. Heindel

The hydrodynamic and liquid particle dispersion processes in agitated vessels containing dilute liquid−liquid dispersions, and dilute liquid dispersions in synthetic fibrous slurries, were experimentally studied. A transparent cylindrical vessel 25 cm in height and 15.5 cm in diameter equipped with a six-blade impeller, with geometric proportions representing the standard vessel configuration, was used. The steady-state size distributions of molten wax particles, which constituted 1% by weight of the mixture everywhere, in pure water, and in aqueous slurries with 0.1%, 0.5%, 0.8%, and 1.0% consistencies of nylon fibers, were measured using sampling and microscopic image ...


Method Of Ultrasonic Measurement Of Texture, Robert Bruce Thompson, John F. Smith, Seung S. Lee, Yan Lee Oct 1997

Method Of Ultrasonic Measurement Of Texture, Robert Bruce Thompson, John F. Smith, Seung S. Lee, Yan Lee

Iowa State University Patents

A method for measuring texture of metal plates or sheets using non-destructive ultrasonic investigation includes measuring the velocity of ultrasonic energy waves in lower order plate modes in one or more directions, and measuring phase velocity dispersion of higher order modes of the plate or sheet if needed. Texture or preferred grain orientation can be derived from these measurements with improves reliability and accuracy. The method can be utilized in production on moving metal plate or sheet.


Dimensions Fall 1997, Iowa State University Department Of Mechanical Engineering Oct 1997

Dimensions Fall 1997, Iowa State University Department Of Mechanical Engineering

Dimensions

No abstract provided.


Proceedings Of The Twenty-Seventh Annual Biochemical Engineering Symposium, Vincent G. Murphy Sep 1997

Proceedings Of The Twenty-Seventh Annual Biochemical Engineering Symposium, Vincent G. Murphy

Biochemical Engineering Symposium Proceedings

The Twenty-Seventh Annual Biochemical Engineering Symposium was held at Colorado State University on September 13, 1997. Approximately seventy students and faculty from six universities (Colorado State University, Iowa State University, Kansas State University, University of Colorado, University of Oklahoma, and University of Wyoming) attended the symposium. The program consisted of nine oral presentations and twenty posters. As has been the practice at previous symposia in this series, all presentations represented ongoing or completed projects conducted by graduate students from the participating universities. Fifteen authors submitted full papers for this proceedings, and seven others contributed summary abstracts. Most describe work in ...


Livestock Industry Facilities And Environment: Swine Breeding Systems—The Breeding Square System, Jay D. Harmon, Carl Watson Sep 1997

Livestock Industry Facilities And Environment: Swine Breeding Systems—The Breeding Square System, Jay D. Harmon, Carl Watson

Agriculture and Environment Extension Publications

The breeding square is arranged with four breeding pens that are surrounded by turn-around crates. The two sides of the square facing each other are the same sex animal. The corners hold the gilts in pens. The center is divided into four breeding pens, each 11 ft by 11 ft. This system is designed for twenty boars, twenty sows, and sixteen gilts.


Livestock Industry Facilities And Environment: Swine Cooling Methods—Evaporative Pads, Jay D. Harmon Sep 1997

Livestock Industry Facilities And Environment: Swine Cooling Methods—Evaporative Pads, Jay D. Harmon

Agriculture and Environment Extension Publications

Evaporative pads are porous pads that are mounted on the sidewall of a building, wet with water, either by running water down it from the top or by spraying water on it with nozzles, and then air is drawn through the pad. This process, called evaporative cooling, uses heat in the air to evaporate water, thereby reducing the air temperature but increasing the humidity.


Livestock Industry Facilities And Environment: Swine Cooling Methods—Sprinkling, Jay D. Harmon Sep 1997

Livestock Industry Facilities And Environment: Swine Cooling Methods—Sprinkling, Jay D. Harmon

Agriculture and Environment Extension Publications

Sprinkling is a cooling method in which pigs are sprinkled with water and then the water is allowed to evaporate. Evaporation of water removes heat from the skin surface of the animals, thereby making them feel cooler.


Livestock Industry Facilities And Environment: Swine Breeding Systems—The Levis System, Jay D. Harmon, Carl Watson Sep 1997

Livestock Industry Facilities And Environment: Swine Breeding Systems—The Levis System, Jay D. Harmon, Carl Watson

Agriculture and Environment Extension Publications

The Levis System was developed by Dr. Don Levis at the University of Nebraska. The basic concept is housing of sows and boars in separate rooms. To heat check, sows are walked into the boar room. Because they have not been exposed to boars on a continuous basis, sows in standing estrus will “lock up” immediately because they are more sensitive to boar stimuli. Pens or stalls may be used for gestation housing.


Livestock Industry Facilities And Environment: Swine Breeding Systems—Effects Of Heat Stress, Jay D. Harmon Sep 1997

Livestock Industry Facilities And Environment: Swine Breeding Systems—Effects Of Heat Stress, Jay D. Harmon

Agriculture and Environment Extension Publications

The thermal environment in the breeding facility plays an important role in total herd management. This manifests itself in poor conception and farrowing rates that may not be detected until weeks or months past the occurrence of an improper thermal environment. Because of this, it is important to anticipate these potential lulls in breeding performance and counteract them by managing the breeding facility environment properly and adding additional open females to keep the facilities full.


Livestock Industry Facilities And Environment: Swine Cooling Methods—Drip Cooling, Jay D. Harmon Sep 1997

Livestock Industry Facilities And Environment: Swine Cooling Methods—Drip Cooling, Jay D. Harmon

Agriculture and Environment Extension Publications

Drip cooling systems are used to drip water on the shoulder of sows or boars in a crated situation. This allows evaporation of the water which removes heat from the neck where a large blood supply is present. It is best used for systems where the animal is confined below the drip nozzle. In farrowing crate usage it has been shown to reduce sow respiration rate, increase feed consumption and improve litter weights.


Livestock Industry Facilities And Environment: Swine Breeding Systems—The Lubbock System, Jay D. Harmon, Carl Watson Sep 1997

Livestock Industry Facilities And Environment: Swine Breeding Systems—The Lubbock System, Jay D. Harmon, Carl Watson

Agriculture and Environment Extension Publications

The Lubbock System places weaned sows in crates with a boar placed in a pen directly behind them. Usually one boar is housed behind five or six sows. The boar pen is used not only to house the boar but for breeding. Females are backed into the breeding pen when estrus is detected. Generally all five sows are not from the same weaning group. This prevents the boar from being over-used.


Livestock Industry Facilities And Environment: Swine Breeding Systems—The Mo-Flex System, Jay D. Harmon, Carl Watson Sep 1997

Livestock Industry Facilities And Environment: Swine Breeding Systems—The Mo-Flex System, Jay D. Harmon, Carl Watson

Agriculture and Environment Extension Publications

The MO-Flex Swine Building System allows for any production stage (Farrowing, Nursery, Grow-Finish and Breeding/Gestation) to be built using the same structural building shell design.


Safe Farm: 1996 Iowa Farm Injury And Fatality Data By County, Charles V. Schwab, Laura J. Miller Sep 1997

Safe Farm: 1996 Iowa Farm Injury And Fatality Data By County, Charles V. Schwab, Laura J. Miller

Agriculture and Environment Extension Publications

Injury and fatality data are listed by hospitalized or not hospitalized, and work or leisure related.


Livestock Industry Facilities And Environment: Swine Cooling Methods—Stirring Fans, Jay D. Harmon Sep 1997

Livestock Industry Facilities And Environment: Swine Cooling Methods—Stirring Fans, Jay D. Harmon

Agriculture and Environment Extension Publications

Stirring fans are used to increase the air flow across animals during hot weather or to reduce temperature stratification in ventilated rooms. Stirring fans may be either the basket type or the ceiling fan type. Both have distinctive uses.


Applying Virtual Reality Techniques To Sensitivity-Based Structural Shape Design, Tsung-Pin Yeh, Judy M. Vance Sep 1997

Applying Virtual Reality Techniques To Sensitivity-Based Structural Shape Design, Tsung-Pin Yeh, Judy M. Vance

Mechanical Engineering Conference Presentations, Papers, and Proceedings

Virtual reality (VR) provides a design space consisting of three-dimensional computer images where participants can interact with these images using natural human motions in real time. In the field of engineering design, prototyping and design verification have provided the initial application areas for VR. The research presented in this paper takes the scenario one step further by incorporating free-form deformation techniques and sensitivity analysis into the virtual world such that the designer can easily implement analysis-based shape design of a structural system where stress considerations are important. NURBSbased free-form deformation (NFFD) methods and direct manipulation techniques are used as the ...


Segregation Of Bismuth To Triple Junctions In Copper, K.-M. Yin, Alexander H. King, T.E. Hsieh, F.-R. Chen, J.J. Kai, L. Chang Sep 1997

Segregation Of Bismuth To Triple Junctions In Copper, K.-M. Yin, Alexander H. King, T.E. Hsieh, F.-R. Chen, J.J. Kai, L. Chang

Alexander H. King

Bismuth segregation in copper has been studied using energy-dispersive X-ray spectrometry (EDX) in a JEOL 2010F transmission electron microscope. In addition to the expected solute enrichment at grain boundaries, we have observed extremely high concentrations of bismuth at certain triple junctions, with significantly greater enrichment factors than in the adjacent grain boundaries. It is shown here that the triple junction segregation is a function of the parameters of the grain boundaries at the triple line, and existence of this type of segregation implies that the affected triple junctions embody excess free energy. At least one of the observed triple junctions ...


Vibrational Spectra In Ordered And Disordered Ni3al, Jeffrey D. Althoff, Dane Morgan, Didier De Fontaine, Mark Asta, S. M. Foiles, Duane D. Johnson Sep 1997

Vibrational Spectra In Ordered And Disordered Ni3al, Jeffrey D. Althoff, Dane Morgan, Didier De Fontaine, Mark Asta, S. M. Foiles, Duane D. Johnson

Duane D. Johnson

We calculate the vibrational density of states (DOS) and corresponding thermodynamic properties of L12 ordered and disordered Ni3Al in the quasiharmonic approximation using the embedded-atom method. Vibrational and thermodynamic properties, including vibrational entropy differences between ordered and disordered states, are found to be in good agreement with experiment. The DOS of the configurationally disordered alloy resembles a broadened version of the DOS of the L12 phase, not a one-atom per cell fcc DOS, and is shifted downward in frequency because the disordered state has a larger volume than the ordered phase. Calculations of the projected DOS indicate that high-frequency modes ...


Spatiotemporal Patterns In Liquid-Liquid Taylor-Couette-Poiseuille Flow, Richard John Campero, R. Dennis Vigil Aug 1997

Spatiotemporal Patterns In Liquid-Liquid Taylor-Couette-Poiseuille Flow, Richard John Campero, R. Dennis Vigil

Chemical and Biological Engineering Publications

The vortex structure of immiscible liquid-liquid Taylor-Couette-Poiseuille flow was studied using photographic techniques. Several parameters were considered, including the feed composition and the inner cylinder rotation rate. For certain feed compositions and sufficiently large rotation rates a translating banded structure, which consisted of alternating aqueous and organic-rich vortices, persisted indefinitely. At lower rotation rates, either a spatially homogeneous emulsion evolved or sustained oscillations between the banded and homogeneous structures developed.


Optoelectronic System For Implementation Of Iterative Computer Tomography Algorithms, Tongxin Lu, Satish S. Udpa Aug 1997

Optoelectronic System For Implementation Of Iterative Computer Tomography Algorithms, Tongxin Lu, Satish S. Udpa

Iowa State University Patents

An optoelectronic tomographic reconstruction system utilizes spacial light modulators in charge couple devices to perform projection iterative reconstruction techniques and simultaneous iterative reconstruction techniques. A back projection processor uses a linear array of analog spacial light modulators in a cylindrical lens, an image detection array, and an image rotator. The image rotator smears a projected image at the same angle as the projection was taken. The back projection processor thus smears the projection back to the image space. An optoelectronic forward projection processor uses an spacial light modulator array, an image rotator, and an image detecting array. A reconstructed image ...


Rapid Analysis Of Wood Using Transient Infrared Spectroscopy And Photoacoustic Spectroscopy With Pls Regression, Stanley J. Bajic, Roger W. Jones, John F. Mcclelland, Bonnie R. Hames, Robert R. Meglen Aug 1997

Rapid Analysis Of Wood Using Transient Infrared Spectroscopy And Photoacoustic Spectroscopy With Pls Regression, Stanley J. Bajic, Roger W. Jones, John F. Mcclelland, Bonnie R. Hames, Robert R. Meglen

Ames Laboratory Conference Papers, Posters, and Presentations

In the forest products industry, improved methods are needed for rapid analysis of wood and paper products. Currently, the best methods for determining chemical and physical properties of wood-based materials require considerable sample preparation and analysis time. Consequently, quantitative information is often not obtained on a time scale suitable for process monitoring, control, and quality assurance. The primary barriers to practical utilization of conventional infrared methods are the opaqueness and poor reflection properties of the wood-based materials. This paper demonstrates how photoacoustic and transient infrared spectroscopies have been combined with chemometric techniques to overcome the limitations of conventional infrared spectroscopies ...