Engineering Commons^™

Modeling Of Algal Productivity And Diel Oxygen Profiles In The Partitioned Aquaculture System, Caye M. Drapcho

All Dissertations

Fish production in pond culture systems is often limited by the dissolved oxygen (DO) concentration. Algal biomass and productivity, which greatly impact the DO concentration, are difficult to control in traditional pond systems. The Partitioned Aquaculture System (PAS) was designed to increase fish production by managing algal productivity and DO through control of algal cell retention time, water depth, and mixing. The objectives of this study were 1) to determine impact of culture conditions on algal productivity, 2) develop a model of algal productivity and diel DO levels, and 3) to predict the maximum fish production attainable with the PAS. …

Multi-Purpose Orchard Shaker/Power Plant, Lloyd Snell

Lloyd D Snell

A harvesting machine for nuts and stone fruits including an articulated body with a front part and a back part. A tree shaker head is detachable and couples to the front part of the harvesting machine by a C-frame mount. The articulated body with a low clearance provides necessary maneuverability in an orchard environment, while permitting the harvesting machine with the shaker head detached, to function as a general purpose orchard machine for mowing, spraying, brush clearing and other associated tasks. Specialized machinery for these tasks is no longer necessary.

Tillage And Cropping Practice Effects On Furrow Irrigation: Hydraulics And Macroporosity, Martin John Norton

Department of Agricultural and Biological Systems Engineering: Dissertations, Theses, and Student Research

Furrow irrigation efficiency and performance is greatly influenced by advance time, infiltration and roughness. An experiment was conducted to determine tillage system and cropping system effects on those three variables. Four tillage systems, disk (D), chisel and disk (C), ridge till (RT), and slot plant (SP) were the treatments. They had been continuous for 17 years on a Hasting's silt loam (fine, montmorillonitic, mesic Udic Argistoll) soil. Subtreatments were a corn/soybean rotation (CS) and a continuous corn (CC) cropping system since 1984. A complete block split plot design was used. We measured inflow rate, advance time, runoff, and furrow geometry …

Gis Utilization For Analysis Of District Drainage Water Recycling, Charles M. Burt, Robert E. Walker

BioResource and Agricultural Engineering

An ARC-INFO GIS system was used to identify physical drainage facilities in a 32,000 ha area of the San Joaquin Valley of California. Once the drainage facilities and linkages were established, it was possible to characterize the strategies used by various irrigation districts to control drainage outflows to the San Joaquin River. The motivation behind the study was the reduction of salt and selenium flows, via agricultural drainage, into the River.

Cal Poly Model Canal, John B. Parrish, Iii, Charles M. Burt

BioResource and Agricultural Engineering

The Cal Poly Model Canal, located at the Water Delivery Facility. Irrigation Training and Research Center, California Polytechnic State University, San Luis Obispo, Calif., was built to accommodate the study and promotion of automated downstream control. Being a large, fully functional scale model of a canal, it was used to collect data for use by the Irrigation Canal System Hydraulic Modeling Task Committee of the ASCE Irrigation and Drainage Division. The data was used by Task Committee members to help evaluate numerical models for simulation of unsteady free-surface flow. The Model Canal and the collected data are discussed. This paper …

Irrigation-Canal - Simulation Model Usage, Charles M. Burt, Gregory Gartrell

BioResource and Agricultural Engineering

Unsteady canal-simulation model usage requires serious investments of time and personnel. The reasons for deciding to invest in a model, as well as reasons not to invest, are discussed. For most cases, it is better to invest in the improvement of an existing model than the writing of a new model. Many excellent models are available, although very few can be considered user-friendly for the average design engineer. Unsteady flow-simulation models are not recommended for real-time control, but are key tools for the study of various control scenarios. Canal models can simulate an actual canal, but the user must input …

A Technical Approach To Groundwater Contamination Problems, Jacqueline C. Burton, Catherine Leser, Candace M. Rose

US Department of Energy Publications

Argonne National Laboratory has been performing technical investigations at sites in Nebraska and Kansas that have identified groundwater contamination by carbon tetrachloride. This comprehensive program will ultimately provide the affected communities with safe drinking water. The first step in the program is to evaluate the available data and identify sites that will require an Alternate Water Supply Study (AWSS). The objective of the AWSS is to identify options for providing a safe drinking water supply to all users, in compliance with the Safe Drinking Water Act. The AWSS consists of an engineering and cost evaluation followed by implementation of the …

Two-Tier Partially Enclosed Air-Cure Tobacco Barn, George A. Duncan

Agricultural Engineering Extension Publications

With the rising costs, scarcity of materials, and greater construction requirements for regular tobacco barns, the concept of a lower cost but functionally sound tobacco curing facility with partial or no sidewall closure has been developed into a blueprint plan shown in Figure 1. The plan can be built and used now with partial sidewalls and enclosed more completely later if desired.

Evaluation Of A Ceramic Roof Coating, William H. Allen, Jay D. Harmon, Dale E. Linvill, Matthew V. Bramblett

Jay D. Harmon

Surfaces treated with a ceramic roof coating (CRC) marketed as AZTEC No. 100 were compared to untreated and white painted surfaces. Dry-bulb and black globe temperatures in the space below or behind the surface were the criteria for comparison. Comparisons included small horizontal panels with open sides, small unvented galvanized steel and styrofoam boxes, and an open-side steel poultry building. The CRC was effective in reducing temperatures in the enclosed test boxes, but less effective with open-side test panels and the open-side steel building. Tests also indicated the CRC is characterized by high emissivity (0.95) and reflectivity (0.87). The evidence …

Solid Livestock Waste Regulatory Requirements, J. L. Taraba, W. D. Thom, Anthony J. Pescatore, R. M. Williams

Agricultural Engineering Extension Updates

Proper management and utilization of livestock waste can be a significant contribution to the economic well being of a livestock enterprise, since the wastes have considerable economic value if properly utilized. When returned to the soil as fertilize or soil conditioner, the value as a nutrient source has been will established. More recently, processed livestock wastes have been utilized as a high protein feed additives. Livestock waste should be considered a resource to be utilized rather than a disposal problem.

Irrigation Methods For Drainage Reduction Subsurface Drip Vs. Furrow Irrigation, J.. D. Oster, R. B. Smith, C. Phene, A. Fulton, S. W. Styles, T. Fernandes

BioResource and Agricultural Engineering

No abstract provided.

Industrial Agricultural Products Center Review 1993

Industrial Agricultural Products Center: Publications and Information

Significant progress has been made toward the goals of the Center. Activities have centered on the identification of opportunities in terms of new industrial uses of agricultural commodities. Assistance has been provided to UNL faculty to procure funding research in the respective areas. In other cases, specific faculty positions have been identified. Subsequent hirings have built a strong group of faculty affiliates.

The main emphasis in the Center has been research on developing new processes and products. A fairly comprehensive list of projects funded and the faculty involved are listed in a subsequent section. Two strategic planning sessions have been …

Rio Mimbres Acequia Systems: An Oral History, Neal W. Ackerly

Books

This volume contains transcripts of interviews with various residents collected during the 1993 field phase of the survey of acequia systems in the Mimbres Valley. As noted in Volume 1, additional interviews were conducted with other residents, but were not recorded. Accordingly, no transcript of these interview sessions cannot be included here.

The individuals interviewed, as well as the abbreviated names appearing in these transcripts, included John VonTress (JVT, age 57), Regis McSherry (RM, age 67), Sam Grijalva (age 73), Charles Disert (age 84), and Horace Bounds (HB, age 90). Vesta McSherry, appearing as VM in transcripts, provided additional information …

Grain Suffocation Hazards, Larry R. Piercy

Agricultural Engineering Extension Updates

Grain and feed storage systems are a common sight on Kentucky farms and usually present no particular hazard for the user. However, flowing grain or grain that is caked or spoiled can pose a serious threat of entrapment and suffocation. To protect yourself and your family, you need to become familiar with this potential hazard.

Laws And Regulation Impacting Livestock Wastes In Kentucky, J. L. Taraba, R. M. Williams

Agricultural Engineering Extension Updates

In recent years, the number of laws and regulations prescribing the rules for everyday life seem to be ever more complex and pervasive. Changing farming methods, expansion of the urban community and increasing public environmental concerns have increased the agricultural producer's need to think more seriously about his method of livestock waste disposal. Laws, regulations, practices, standards and ordinances range from the obvious (solid waste management) to the not so obvious (protection of endangered species). The public has protection from the farmers (discharge permits) and the farmer has protection from the public (Right to Farm laws). The following is an …

Generation And Legal Regulation Of Odors Form Animal Manures, J. L. Taraba, R. M. Williams

Agricultural Engineering Extension Updates

The present trend of animal and dairy product producers is toward total confinement facilities and larger animal herds. Generally the rewards to the producer for these practices are higher economic returns which result from higher feeding efficiencies and better quality products. However, total confinement is not without problems that were previously not present or were minimal in nature when animals were maintained in fields. Confinement facilities have a greater impact on environmental quality of both water and air. Presently, one of the major problems facing animal and dairy product producers is odor production. The greatest number of complaints concerning environmental …

Kentucky State Agencies With Water Responsibilities, Joseph L. Taraba

Agricultural Engineering Extension Updates

On the following pages are a list of Kentucky state government agencies that have responsibilities and programs that relate to water in the areas of quality, health, supply, financing, flood control, recreation and tourism. For local programs on water, one of these agencies might be able to supply material, personnel or other programming information that would aid of your local extension water issue goals.

Transport Of Co2+ In A Physically And Chemically Heterogeneous Porous Medium, Mark L. Brusseau, John M. Zachara

US Department of Energy Publications

The fate of radionuclides in the subsurface is of critical importance to the planning, siting, and evaluation of repositories for radioactive wastes. Mathematical models are an integral component of this process. An accurate understanding of radionuclide transport is required to successfully formulate and use these models. It is well-known that the subsurface is both physically and chemically heterogeneous. Recent research has shown that the resultant spatial variability of hydraulic conductivity and of sorption capacity can significantly affect solute transport in the subsurface. The impact of hydraulic conductivity variability and sorption capacity variability on the transport of radionuclides is, therefore, of …

The Honor Society Of Agriculture, Gamma Sigma Delta, Nebraska Chapter History, Diamond Jubilee 1918-1993, Charles H. Adams

Gamma Sigma Delta, Nebraska Chapter: Bylaws and Other Documents

GAMMA SIGMA DELTA is a faculty governed society that selects its members from junior and senior students, graduate students, faculty, and alumni for the promotion and recognition of high achievement. While Gamma Sigma Delta is an honor society of agriculture, it may elect members from related fields such as biology, botany, chemistry, economics, entomology, forestry, home economics, plant pathology, sociology, statistics, veterinary medicine, or zoology when the work of the individuals is related to agriculture. Officers, committee chairpersons, and others leading the chapter are faculty or alumni.

EARLY INTERNATIONAL HISTORY

GAMMA SIGMA DELTA INTERNATIONAL OFFICERS FROM THE NEBRASKA CHAPTER

THE …