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

Digital Commons Network™

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

2004

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 20551 - 20580 of 21312

Full-Text Articles in Entire DC Network

Resource Allocation In A Breeding Program For Phosphorus Concentration In Maize Grain, Brandon M. Wardyn, W. Ken Russell Jan 2004

Resource Allocation In A Breeding Program For Phosphorus Concentration In Maize Grain, Brandon M. Wardyn, W. Ken Russell

Department of Agronomy and Horticulture: Faculty Publications

When beef cattle (Bos taurus) are fed grain of maize (Zea mays L.) in which the concentration of phosphorus (P) exceeds the animal’s need for this element, the excess P is excreted in the feces. Spreading this manure on cropland increases the potential for P pollution of surface waters by run-off. Experiments were undertaken to determine the relative magnitudes of genotypic and nongenotypic variances of P concentration in maize grain (P-Gr) to assess the ability to select maize genotypes in which this trait more closely matches the dietary need of beef cattle. Genetic variability was found in …

Go to article

Windbreaks In North American Agricultural Systems, James R. Brandle, Laurie Hodges, Xinhua H. Zhou Jan 2004

Windbreaks In North American Agricultural Systems, James R. Brandle, Laurie Hodges, Xinhua H. Zhou

Department of Agronomy and Horticulture: Faculty Publications

Windbreaks are a major component of successful agricultural systems throughout the world. The focus of this chapter is on temperate-zone, commercial, agricultural systems in North America, where windbreaks contribute to both producer profitability and environmental quality by increasing crop production while simultaneously reducing the level of off-farm inputs. They help control erosion and blowing snow, improve animal health and survival under winter conditions, reduce energy consumption of the farmstead unit, and enhance habitat diversity, providing refuges for predatory birds and insects. On a larger landscape scale windbreaks provide habitat for various types of wildlife and have the potential to contribute …

Go to article

Glyphosate Efficacy On Velvetleaf Varies With Application Time Of Day, Aaron L. Waltz, Alex R. Martin, Fred W. Roeth, John L. Lindquist Jan 2004

Glyphosate Efficacy On Velvetleaf Varies With Application Time Of Day, Aaron L. Waltz, Alex R. Martin, Fred W. Roeth, John L. Lindquist

Department of Agronomy and Horticulture: Faculty Publications

Field and growth chamber experiments determined the efficacy of temporal glyphosate applications on velvetleaf. Glyphosate was applied post-emergence to velvetleaf periodically before and during light and after dark. In 1999, glyphosate at 840 g ae/ha applied before sunrise and after midday provided 54 and 100% velvetleaf control, respectively. In 2000, glyphosate at 840 g/ha applied before sunrise, midday, and after sunset provided 69, 100, and 37% velvetleaf control, respectively. In the growth chamber, glyphosate at 840 g/ha applied before or after light reduced velvetleaf biomass 15 to 20% or 32 to 47%, respectively, and reduced velvetleaf height 24% or 45 …

Go to article

New Fixed Assets Management Process Design For Pontifica Universidad Catolica Madre Y Maestra (Pucmm), Mary Baez Jan 2004

New Fixed Assets Management Process Design For Pontifica Universidad Catolica Madre Y Maestra (Pucmm), Mary Baez

Theses

Currently, PUCMM does not have a reliable management process for its fixed and controlled assets. In addition, PUCMM does not have a system that can provide accurate, fast and updated information about these items. Therefore, there is the need of a new process for managing PUCMM's fixed assets. The purpose of this research is to design a new management process for PUCMM's fixed and controlled assets that will provide reliable, quick and updated information. The methodology for this study is based on a cross-sectional study to assess fixed assets management processes in this and other well-established organizations. It is a …

Go to article

Indirect Adaptive Control For Synchronous Generator: Comparison Of Mlp/Rbf Neural Networks Approach With Lyapunov Stability Analysis, Jung-Wook Park, Ronald G. Harley, Ganesh K. Venayagamoorthy Jan 2004

Indirect Adaptive Control For Synchronous Generator: Comparison Of Mlp/Rbf Neural Networks Approach With Lyapunov Stability Analysis, Jung-Wook Park, Ronald G. Harley, Ganesh K. Venayagamoorthy

Electrical and Computer Engineering Faculty Research & Creative Works

This paper compares two indirect adaptive neurocontrollers, namely a multilayer perceptron neurocontroller (MLPNC) and a radial basis function neurocontroller (RBFNC) to control a synchronous generator. The different damping and transient performances of two neurocontrollers are compared with those of conventional linear controllers, and analyzed based on the Lyapunov direct method.

Go to article

Measuring The Robustness Of A Resource Allocation, Shoukat Ali, A. A. Maciejewski, Howard Jay Siegel, Jong-Kook Kim Jan 2004

Measuring The Robustness Of A Resource Allocation, Shoukat Ali, A. A. Maciejewski, Howard Jay Siegel, Jong-Kook Kim

Electrical and Computer Engineering Faculty Research & Creative Works

Parallel and distributed systems may operate in an environment that undergoes unpredictable changes causing certain system performance features to degrade. Such systems need robustness to guarantee limited degradation despite fluctuations in the behavior of its component parts or environment. This research investigates the robustness of an allocation of resources to tasks in parallel and distributed systems. The main contributions are 1) a mathematical description of a metric for the robustness of a resource allocation with respect to desired system performance features against multiple perturbations in multiple system and environmental conditions, and 2) a procedure for deriving a robustness metric for …

Go to article

Using Multi-Spectral Imagery To Evaluate Corn Grown Under Nitrogen And Drought Stressed Conditions, Shannon L. Osborne, James S. Schepers, Mike R. Schlemmer Jan 2004

Using Multi-Spectral Imagery To Evaluate Corn Grown Under Nitrogen And Drought Stressed Conditions, Shannon L. Osborne, James S. Schepers, Mike R. Schlemmer

Department of Agronomy and Horticulture: Faculty Publications

The in-season estimation of crop stresses which have the potential of adversely affecting crop yield and/or quality could allow producers to make in-season management decisions to correct for the particular stress. A field study was conducted to evaluate the use of multispectral imagery for estimating corn (Zea mays L.) grain yield, in-season biomass and nitrogen (N) concentration under varying N and drought stresses. The experiment was a split-plot design with three replications using a factorial arrangement of treatments. Three irrigation (whole-plot) treatments included dry land, irrigation based on 0.5, and full evapotranspiration (ET). Sub-plot treatments included five N …

Go to article

An Improved Optimal Elemental Method For Updating Finite Element Models, Zhongdong Duan, B. F. Spencer, Guirong Yan, Jinping Ou Jan 2004

An Improved Optimal Elemental Method For Updating Finite Element Models, Zhongdong Duan, B. F. Spencer, Guirong Yan, Jinping Ou

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The Optimal Matrix Method and Optimal Elemental Method Used to Update Finite Element Models May Not Provide Accurate Results. This Situation Occurs When the Test Modal Model is Incomplete, as is Often the Case in Practice. an Improved Optimal Elemental Method is Presented that Defines a New Objective Function, and as a Byproduct, Circumvents the Need for Mass Normalized Modal Shapes, Which Are Also Not Readily Available in Practice. to Solve the Group of Nonlinear Equations Created by the Improved Optimal Method, the Lagrange Multiplier Method and Matlab Function Fmincon Are Employed. to Deal with Actual Complex Structures, the Float-Encoding …

Go to article

Stationkeeping Of An L₂ Libration Point Satellite With Θ-D Technique, Ming Xin, S. N. Balakrishnan, Henry J. Pernicka, Michael W. Dancer Jan 2004

Stationkeeping Of An L₂ Libration Point Satellite With Θ-D Technique, Ming Xin, S. N. Balakrishnan, Henry J. Pernicka, Michael W. Dancer

Mechanical and Aerospace Engineering Faculty Research & Creative Works

A new method for L2 libration-point orbit stationkeeping is proposed in this paper using continuous thrust. The circular restricted three-body problem with Sun and Earth as the two primaries is considered. The unstable orbit about the L2 libration-point requires stationkeeping maneuvers to maintain the nominal path. In this study, an approach, called the "θ-D technique," based on optimal control theory gives a closed-form suboptimal feedback solution to solve this nonlinear control problem. In this approach the Hamiltonian-Jacobi-Bellman (HJB) equation is solved approximately by adding some perturbations to the cost function. The controller is designed such that the actual …

Go to article

Accuracy And Interferences For Enzyme-Linked Immunoassay Tests For Atrazine, Craig D. Adams, Hua Jiang, Michael Mcguire, Nicole Graziano, Alan Roberson, Michelle Frey Jan 2004

Accuracy And Interferences For Enzyme-Linked Immunoassay Tests For Atrazine, Craig D. Adams, Hua Jiang, Michael Mcguire, Nicole Graziano, Alan Roberson, Michelle Frey

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Atrazine is one of the most commonly used herbicides in the United States, therefore it is a regulatory concern and is extensively monitored in the environment, especially in drinking water. Because of the higher costs of gas chromatography (GC) methods, utility managers and regulators are considering the increased use of enzyme-linked immunosorbent assay (ELISA) methods for monitoring atrazine. an ELISA test kit was recently approved by the US Environmental Protection Agency. the research in this article points out potential biases and inaccuracies that may occur with such test kits. ELISA test kits for atrazine are typically precise (repeatable) but often …

Go to article

Neuromechanical Control Of Locomotion In Intact And Incomplete Spinal Cord Injured Rats, Anil Kumar Thota Jan 2004

Neuromechanical Control Of Locomotion In Intact And Incomplete Spinal Cord Injured Rats, Anil Kumar Thota

University of Kentucky Master's Theses

Rodent models are being extensively used to investigate the effects of traumatic injuryand to develop and assess the mechanisms of repair and regeneration. We presentquantitative assessment of 2D kinematics of overground walking and for the first time3D joint angle kinematics of all four limbs during treadmill walking in the intact and inincomplete spinal cord contusion injured (iSCI) adult female Long Evans rats. Phaserelationship between joint angles on a cycle-by-cycle basis and interlimb footfalls areassessed using a simple technique. Electromyogram (EMG) data from major flexor andextensor muscles for each of the hindlimb joints and elbow extensor muscles of theforelimbs synchronized to …

Go to article

Avatar, Sean Kirchhoff Jan 2004

Avatar, Sean Kirchhoff

Theses

AVATAR||Presents the artist's personal experience and background for the artist's thesis exhibit, the artist's work of previous quarters at RIT, influential artists, and the philosophy behind the artist's use of appropriation.

Go to article

Domestic Chair, Wei-Mien Hsu Jan 2004

Domestic Chair, Wei-Mien Hsu

Theses

None provided.

Go to article

Collaborative Strategies That Would Minimize Interruption In Work Output In A Human Resources Development Department During An Acquisition, Crystal E. Lilly Jan 2004

Collaborative Strategies That Would Minimize Interruption In Work Output In A Human Resources Development Department During An Acquisition, Crystal E. Lilly

OTS Master's Level Projects & Papers

The problem of this study was to identify collaborative strategies that would minimize interruption in work output in a Human Resources Development department during an acquisition.

Go to article

Marketing Supported Employment Programs And The Relationship To Employment Opportunities, Sara L. Mcinturff Jan 2004

Marketing Supported Employment Programs And The Relationship To Employment Opportunities, Sara L. Mcinturff

OTS Master's Level Projects & Papers

The purpose of this study was to determine the relationship between the marketing of the Job Link Program to business members of the Loudoun County Chamber of Commerce and its relationship to employment opportunities for adults with significant disabilities.

Go to article

The Effects Of Reading Readiness And Student Achievement In The Primary Grades Through The Use Of Phonemic Awareness, Curtis A. S. Campbell Jan 2004

The Effects Of Reading Readiness And Student Achievement In The Primary Grades Through The Use Of Phonemic Awareness, Curtis A. S. Campbell

OTS Master's Level Projects & Papers

The problem of the study was to determine the effects that reading readiness, such as phonemic awareness, alphabet knowledge, concept of word, and letter-sound knowledge, and the relationship it has on student achievement on the Phonological Awareness Literacy Screening (PALS) Test on a kindergarten class at Deep Creek Central Elementary School in Chesapeake.

Go to article

A Physics-Based Model Of Sic-Based Mesfets, Sankha Mukherjee Jan 2004

A Physics-Based Model Of Sic-Based Mesfets, Sankha Mukherjee

Theses

Silicon Carbide (SiC) has been investigated as an alternative material to Silicon (Si) for enhancing the power-handling capability of semiconductor devices for simultaneous high-temperature and high frequency applications. Its high thermal conductivity, high bandgap, low permittivity, high saturation velocity, moderate mobility, material hardness and chemical inertness make it a prime candidate for power electronics, heat and light sensors, and MEMS applications. The MESFET is the most viable power transistor based on SiC. The performance of SiC MESFETs is limited by trapping and thermal effects. A physics-based analytical model of the SiC MESFET incorporating trapping and thermal effects is reported. The …

Go to article

A Unique Fault-Tolerant Design For Flying Capacitor Multilevel Inverter, Xiaomin Kou, Keith Corzine, Yakov L. Familiant Jan 2004

A Unique Fault-Tolerant Design For Flying Capacitor Multilevel Inverter, Xiaomin Kou, Keith Corzine, Yakov L. Familiant

Electrical and Computer Engineering Faculty Research & Creative Works

This paper presents a unique design for flying capacitor type multilevel inverters with fault-tolerant features. When a single-switch fault per phase occurs, the new design can still provide the same number of converting levels by shorting the fault power semiconductors and reconfiguring the gate controls. The most attractive point of the proposed design is that it can undertake the single-switch fault per phase without sacrificing power converting quality. Future more, if multiple faults occur in different phases and each phase have only one fault switch, the proposed design can still conditionally provide consistent voltage converting levels. This paper will also …

Go to article

Partial Discharge On-Line Monitoring For Hv Cable Systems Using Electrooptic Modulators, Paul L. Lewin, David Pommerenke, Simon J. Sutton, Yuan Tian, James S. Wilkinson Jan 2004

Partial Discharge On-Line Monitoring For Hv Cable Systems Using Electrooptic Modulators, Paul L. Lewin, David Pommerenke, Simon J. Sutton, Yuan Tian, James S. Wilkinson

Electrical and Computer Engineering Faculty Research & Creative Works

A technique for the remote inspection and monitoring of partial discharge (PD) activity using an optical network is described. The network uses a LiNbO3, modulator to modulate the intensity of the transmitted laser light approximately proportional to the voltage applied across the modulator. The laser light is transmitted along an optical fibre and measured remotely by a high-speed optical receiver. A capacitive coupler has been used to detect partial discharge activity and act as the modulator's input voltage source. The electro-optic modulator is passive and does not require a power supply at the site of the PD detection sensor. The …

Go to article

Comparative Analysis Of Bragg Fibers, Shangping Guo, Sacharia Albin, Robert S. Rogowski Jan 2004

Comparative Analysis Of Bragg Fibers, Shangping Guo, Sacharia Albin, Robert S. Rogowski

Electrical & Computer Engineering Faculty Publications

In this paper, we compare three analysis methods for Bragg fibers, viz. the transfer matrix method, the asymptotic method and the Galerkin method. We also show that with minor modifications, the transfer matrix method is able to calculate exactly the leakage loss of Bragg fibers due to a finite number of H/L layers. This approach is more straightforward than the commonly used Chew’s method. It is shown that the asymptotic approximation condition should be satisfied in order to get accurate results. The TE and TM modes, and the band gap structures are analyzed using Galerkin method.

Go to article

Are Microbubbles Necessary For The Breakdown Of Liquid Water Subjected To A Submicrosecond Pulse?, R. P. Joshi, J. Qian, G. Zhao, J. Kolb, K. H. Schoenbach, E. Schamiloglu, J. Gaudet Jan 2004

Are Microbubbles Necessary For The Breakdown Of Liquid Water Subjected To A Submicrosecond Pulse?, R. P. Joshi, J. Qian, G. Zhao, J. Kolb, K. H. Schoenbach, E. Schamiloglu, J. Gaudet

Electrical & Computer Engineering Faculty Publications

Electrical breakdown in homogeneous liquid water for an ∼ 100 ns voltage pulse is analyzed. It is shown that electron-impact ionization is not likely to be important and could only be operative for low-density situations or possibly under optical excitation. Simulation results also indicate that field ionization of liquid water can lead to a liquid breakdown provided the ionization energies were very low in the order of 2.3eV. Under such conditions, an electric-field collapse at the anode and plasma propagation toward the cathode, with minimal physical charge transport, is predicted. However, the low, unphysical ionization energies necessary for matching …

Go to article

Adaptive Critic Neural Network-Based Object Grasping Control Using A Three-Finger Gripper, Gustavo Galan, Jagannathan Sarangapani Jan 2004

Adaptive Critic Neural Network-Based Object Grasping Control Using A Three-Finger Gripper, Gustavo Galan, Jagannathan Sarangapani

Electrical and Computer Engineering Faculty Research & Creative Works

Grasping of objects has been a challenging task for robots. The complex grasping task can be defined as object contact control and manipulation subtasks. In this paper, object contact control subtask is defined as the ability to follow a trajectory accurately by the fingers of a gripper. The object manipulation subtask is defined in terms of maintaining a predefined applied force by the fingers on the object. A sophisticated controller is necessary since the process of grasping an object without a priori knowledge of the object's size, texture, softness, gripper, and contact dynamics is rather difficult. Moreover, the object has …

Go to article

Learning To Learn-Concepts In A First Power Engineering Course, Badrul H. Chowdhury Jan 2004

Learning To Learn-Concepts In A First Power Engineering Course, Badrul H. Chowdhury

Electrical and Computer Engineering Faculty Research & Creative Works

Three well-known and widely accepted concepts in educational psychology are revisited. These are "inventory of learning styles," "taxonomy of educational objectives," and "metacognition." Relationships among these concepts are highlighted. Often, a student can develop his (or her) own learning style by the process of metacognition. Ideas are borrowed from these concepts for use in a first-level power systems course. It is beyond a doubt that both cognitive and metacognitive skills are necessary for students to succeed in any course. While a semester-long power systems course leaves little time for critical thinking and passive reflection for students, certain activities may very …

Go to article

Crop And Soil Productivity Response To Corn Residue Removal: A Literature Review, Wallace Wilhelm, J.M.F. Johnson, J. L. Hatfield, W.B. Voorhees, D.R. Linden Jan 2004

Crop And Soil Productivity Response To Corn Residue Removal: A Literature Review, Wallace Wilhelm, J.M.F. Johnson, J. L. Hatfield, W.B. Voorhees, D.R. Linden

Department of Agronomy and Horticulture: Faculty Publications

Society is facing three related issues: over-reliance on imported fuel, increasing levels of greenhouse gases in the atmosphere, and producing sufficient food for a growing world population. The U.S. Department of Energy and private enterprise are developing technology necessary to use high-cellulose feedstock, such as crop residues, for ethanol production. Corn (Zea mays L.) residue can provide about 1.7 times more C than barley (Hordeum vulgare L.), oat (Avena sativa L.), sorghum [Sorghum bicolor (L.) Moench], soybean [Glycine max L.) Merr.], sunflower (Helianthus annuus L.), and wheat (Triticum aestivum L.) residues based on …

Go to article

Characterization Of Human Metal Esd Reference Discharge Event And Correlation Of Generator Parameters To Failure Levels-Part Ii: Correlation Of Generator Parameters To Failure Levels, Kai Wang, David Pommerenke, Ramachandran Chundru, Thomas Van Doren, Jiu Sheng Huang, Federico Centola Jan 2004

Characterization Of Human Metal Esd Reference Discharge Event And Correlation Of Generator Parameters To Failure Levels-Part Ii: Correlation Of Generator Parameters To Failure Levels, Kai Wang, David Pommerenke, Ramachandran Chundru, Thomas Van Doren, Jiu Sheng Huang, Federico Centola

Electrical and Computer Engineering Faculty Research & Creative Works

Most electrostatic discharge (ESD) generators are built in accordance with the IEC 61000-4-2 specifications. It is shown, that the voltage induced in a small loop correlates with the failure level observed in an ESD failure test on the systems comprised of fast CMOS devices, while rise time and derivative of the discharge current did not correlate well. The electric parameters of typical ESD generators and ESD generators that have been modified to reflect the current and field parameters of the human metal reference event are compared and the effect on the failure level of fast CMOS electronics is investigated. The …

Go to article

Distribution Of Legumes Along Gradients Of Slope And Soil Electrical Conductivity In Pastures, John A. Guretzky, Kenneth J. Moore, C. Lee Burras, E. Charles Brummer Jan 2004

Distribution Of Legumes Along Gradients Of Slope And Soil Electrical Conductivity In Pastures, John A. Guretzky, Kenneth J. Moore, C. Lee Burras, E. Charles Brummer

Department of Agronomy and Horticulture: Faculty Publications

Legumes establish and persist on backslope landscape positions but fail on summits and toeslopes in southeastern Iowa pastures, suggesting that these pastures be managed site specifically. Visual delineation of landscape positions, however, can be difficult, and char- acterization of spatial variability through soil sampling is expensive. Creation of digital elevation models (DEM) and apparent soil electrical conductivity (ECa) mapping are inexpensive alternatives to de- scribing field conditions. Our objective was to examine the relationships of DEM-derived slope, soil ECa, and legume distribution in pastures.We examined these relationships across four 1.4-ha pastures. Each pasture was divided into …

Go to article

Do Distance Learning Students Taking Business And Technology Courses At Olympic College Achieve The Same Grade Point Averages As On-Campus Students In The Same Courses, Steven J. Ericson Jan 2004

Do Distance Learning Students Taking Business And Technology Courses At Olympic College Achieve The Same Grade Point Averages As On-Campus Students In The Same Courses, Steven J. Ericson

OTS Master's Level Projects & Papers

To guide this problem, the following hypothesis was established: 1. There will be no significant difference in the GPAs of online and on-campus students in the same Business and Technology courses at Olympic College.

Go to article

The Effects Pre-School Attendance Has On Kindergarten Phonological Awareness Literacy Screening, Dennise M. Marcinko Jan 2004

The Effects Pre-School Attendance Has On Kindergarten Phonological Awareness Literacy Screening, Dennise M. Marcinko

OTS Master's Level Projects & Papers

The problem of this study was to determine if there is a relationship between students who do or do not attend pre-school and passing the fall kindergarten PALS test at Sedgefield Elementary School. The hypothesis is that students who attend preschool will have higher rates of passing the fall kindergarten PALS test than students who do not attend preschool.

Go to article

The Satisfaction Of Federal Government Workers, Union And Non-Union, With The Effectiveness Of Their Representation On Job Security Issues, Anthony W. Sommerville Jan 2004

The Satisfaction Of Federal Government Workers, Union And Non-Union, With The Effectiveness Of Their Representation On Job Security Issues, Anthony W. Sommerville

OTS Master's Level Projects & Papers

The goals of this study were to answer the following questions: 1) How do union and non-union members feel the union supports improving working conditions, seeking economic security for its members and promotes dignity and respect in the workforce? 2) How do union workers at Langley feel about the effectiveness of their representation on job security issues? 3) What is the prevalent reason why government employees at Langley choose not to join the union? Be default, the union continues to represent them on job security issues?

Go to article

Social Interaction And Reading Achievement Among Children In Poverty, Kendra M. Boykin Jan 2004

Social Interaction And Reading Achievement Among Children In Poverty, Kendra M. Boykin

OTS Master's Level Projects & Papers

The purpose of this study was to determine if there was a significant difference in the reading achievement of children in a Title I school between children with high social interaction and those with low social interaction after school.

Go to article

First Prev Next Last