Life Sciences Commons^™

Modeling Heat Transfer During Cooling Of Ready-To-Eat Meat And Poultry Products Using Three-Dimensional Finite Element Analysis And Web-Based Simulation, Jihan F. Cepeda Jimenez

Department of Biological Systems Engineering: Dissertations and Theses

The meat industry is required to comply with processing performance standards for preventing the growth of foodborne pathogens in products. These performance standards, established by the United States Department of Agriculture - Food Safety and Inspection Service (USDA-FSIS) require a reduction of Salmonella spp (lethality standard) and limit the growth of sporeforming bacteria (stabilization standard) in certain processed meat products. In general, strategies used to comply with these standards are associated with thermal processing. Meat processors have difficulties complying with these performance standards. Moreover, thermal processing deviations are an issue in the meat industry that generate uncertainty regarding the safety …

Comparing Cropping System Productivity Between Fixed Rotations And A Flexible Fallow System Using Modeling And Historical Weather Data In The Semi-Arid Central Great Plains, Juan Jose Miceli-Garcia

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

In the Central Great Plains, the predominant crop rotation is winter wheat (Triticum aestivum L.)-fallow. Producers are looking to add diversity and intensity to their cropping systems by adding summer crops, however, the elimination of summer fallow may increase crop production risk. The objective of this study was to use crop simulation modeling to compare the productivity of two fixed rotations [winter wheat-corn (Zea mays L.)-fallow and winter wheat-corn-spring triticale (X Triticosecale Wittmack)] with simulated flexible fallow rotations. The flexible fallow rotations made the decision to plant triticale or use summer fallow prior to winter wheat seeding based …

Numerical Modeling Scenario Runs To Assess Tss And Chlorophyll Reductions Caused By Ecosystem Restoration, Lynnhaven River, Mac Sisson, Yuepeng Li, Harry V. Wang, Albert Kuo

Reports

No abstract provided.

Development Of Hydrodynamic And Water Quality Models For The Lynnhaven River System, Mac Sisson, Harry V. Wang, Yuepeng Li, Jian Shen, Albert Y. Kuo, Wenping Gong, Mark Brush, Ken Moore

Reports

No abstract provided.

Representation Of Bed Stresses Within A Model Of Chesapeake Bay, Courtney K. Harris, J. Paul Rinehimer, Sung-Chan Kim

Reports

This project focused on numerical modeling of the Estuarine Turbidity Maximum (ETM) with the goal of improving the representation of the bottom boundary layer and turbulent mixing within the Chesapeake Bay Program’s model [see Cerco and Noel, 2004]. The effort has been part of the EPA’s sediment modeling initiative for the Chesapeake Bay, in coordination with the U.S. Army Corps of Engineers (USACE), Engineering Research and Development Center (ERDC). Research activities focused on the Upper Chesapeake Bay and major tributaries in Maryland (such as the Potomac River); and assisted management of the U.S. EPA TMDL (Total Maximum Daily Load) project …

The Impacts Of Miscanthus×Giganteus Production On The Midwest Us Hydrologic Cycle, Andy Vanloocke, Carl J. Bernacchi, Tracy E. Twine

Andy VanLoocke

Multidisciplinary Assessment And Documentation Of Past And Present Human Impacts On The Neotropical Forests Of Petén, Guatemala, Christopher Stephen Balzotti

Theses and Dissertations

Tropical forests provide important habitat for a tremendous diversity of plant and animal species. However, limitations in measuring and monitoring the structure and function of tropical forests has caused these systems to remain poorly understood. Remote-sensing technology has provided a powerful tool for quantification of structural patterns and associating these with resource use. Satellite and aerial platforms can be used to collect remotely sensed images of tropical forests that can be applied to ecological research and management. Chapter 1 of this article highlights the resources available for tropical forest remote sensing and presents a case-study that demonstrates its application to …

A Numerical Modeling Assessment For The Implementation Of A Runoff Reduction Strategy Plan For The Restoration Of Thalia Creek, Virginia Beach, Mac Sisson, Jian Shen, W. G. Reay, Eduardo J. Miles, Albert Y. Kuo, Harry V. Wang

Reports

No abstract provided.

Combining Local- And Large-Scale Models To Predict The Distributions Of Invasive Plant Species, Chad C. Jones, Steven A. Acker, Charles B. Halpern

Botany Faculty Publications

Habitat-distribution models are increasingly used to predict the potential distributions of invasive species and to inform monitoring. However, these models assume that species are in equilibrium with the environment, which is clearly not true for most invasive species. Although this assumption is frequently acknowledged, solutions have not been adequately addressed. There are several potential methods for improving habitat-distribution models. Models that require only presence data may be more effective for invasive species, but this assumption has rarely been tested. In addition, combining modeling types to form ‘ensemble’ models may improve the accuracy of predictions. However, even with these improvements, models …

A Quantitative Phosphorus Loss Assessment Tool For Agricultural Fields, Michael J. White, Daniel E. Storm, Philip R. Busteed, Michael D. Smolen, Hailin Zhang, Garey A. Fox

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

In the United States, government sponsored conservation programs are under increasing pressure to quantify the environmental benefits of practices they subsidize. To meet this objective, conservation planners need tools to accurately predict phosphorus (P) loss from agricultural lands. Existing P export coefficient based tools are easy to use, but do not adequately account for local conditions. Hydrologic and water quality models are more accurate, but are prohibitively complex for conservation planners to use. Pasture Phosphorus Management (PPM) was developed as a user-friendly P and sediment loss prediction tool based on the Soil and Water Assessment Tool (SWAT), a popular comprehensive …

An Integrated Modeling Method For Bone Strain Analysis, Daniel Leib, Henry Wang, Eric Dugan

Daniel Leib

No abstract provided.

An Integrated Modeling Method For Tibia Strain Analysis, Daniel Leib, Henry Wang

Daniel Leib

No abstract provided.

Parametric Modeling Of Root Length Density And Root Water Uptake In Unsaturated Soil, Sina Besharat, Amir Hossein Nazemi, Ali Ashraf Sadraddini

Turkish Journal of Agriculture and Forestry

The problem of water movement through the root zone has attracted increasing interest during the last few decades. In this research, the spatial and temporal pattern of root water uptake in wetted soil was studied in the root zone of a 6-year-old apple tree. An important part of the root water uptake model is root length density, which was measured by sampling soil cores in one quarter of the root zone. The exponential model better described the observed apple root distribution. The measured data were compared against the outputs of the root density distribution model. A normalized root length density …

Complexity And Human Gait, Leslie M. Decker, Fabien Cignetti, Nikolaos Stergiou

Journal Articles

Recently, the complexity of the human gait has become a topic of major interest within the field of human movement sciences. Indeed, while the complex fluctuations of the gait patterns were, for a long time, considered as resulting from random processes, the development of new techniques of analysis, so-called nonlinear techniques, has open new vistas for the understanding of such fluctuations. In particular, by connecting the notion of complexity to the one of chaos, new insights about gait adaptability, unhealthy states in gait and neural control of locomotion were provided. Through methods of evaluation of the complexity, experimental results obtained …

Equilibrium And Kinetic Modeling Of The Adsorption Of Indigo Carmine Onto Silk, Naparat Jiwalak, Saowanee Rattanaphani, John B. Bremner, Vichitr Rattanaphani

Faculty of Science - Papers (Archive)

Quantitative adsorption kinetic and equilibrium parameters for indigo carmine dyeing of silk were studied using UV-visible absorption spectroscopy. The effect of initial dye concentration, contact time, pH, material to liquor ratio (MLR), and temperature were determined to find the optimal conditions for adsorption. The mechanism of adsorption of indigo carmine dyeing onto silk was investigated using the pseudo first-order and pseudo second-order kinetic models. The adsorption kinetics was found to follow a pseudo-second-order kinetic model with an activation energy (E-a) of 51.06 kJ/mol. The equilibrium adsorption data of indigo carmine dye on silk were analyzed by the Langmuir and Freundlich …