Engineering Commons^™

Manure Use Planning: An Evaluation Of A Producer Training Program, Charles S. Wortmann, Richard K. Koelsch, Charles A. Shapiro, Richard L. Deloughery, David D. Tarkalson

Department of Agricultural and Biological Systems Engineering: Faculty Publications

A training program for producers in manure use planning was evaluated. The potential for runoff nutrient loss to surface water can reduced and the value of manure increased through better planning of manure use. Training was conducted throughout Nebraska in 2002 and 2003. Livestock producers who attended evaluated the event at the end of the last class. The need for and impact of the training was greater for continuing operational and maintenance skills of manure utilization that are regularly needed for strategic planning skills. We recommend that training focus primarily on operational and maintenance skills.

Stochastic Modeling Of The Permeability Of Randomly Generated Porous Media, Yusong Li, Eugene Leboeuf, P. K. Basu, Sankaran Mahadevan

Department of Civil and Environmental Engineering: Faculty Publications

Permeability of porous media in subsurface environments is subject to potentially large uncertainties due to the heterogeneity of natural systems. In this study, a first-order reliability method (FORM) is combined with a lattice Boltzmann method (LBM) to estimate the permeability of randomly generated porous media. The proposed procedure provides an increased ease of addressing complex pore structures by employing LBM to model fluid flow, while inheriting the computational efficiency from FORM. Macroscale- equivalent permeability can thus be estimated with significantly reduced computational efforts, while maintaining a connection to the complex microscale fluid dynamics within a pore structure environment. Implemented on …

Magnetization Reversal In Particulate L10 Nanostructures, Jian Zhou, Ralph Skomski, Kory D. Sorge, David J. Sellmyer

Nebraska Center for Materials and Nanoscience: Faculty Publications

Magnetization processes in particulate L1₀ FePt nanostructures are investigated by model calculations and numerical simulations. The systems considered include anisotropic nanograins embedded in non-magnetic matrix; randomly oriented nanoclusters embedded in a C matrix, and nanocomposites of FePt particles in a semi-hard matrix. The reversal mechanisms depend on both intra- and intergranular features. Quasi-coherent rotation dominates the reversal in weakly-coupled granular magnets, but interface imperfections yield a disproportionately strong coercivity reduction. Strong intergranular exchange leads to a transition to a discrete pinning regime, which is accompanied by a coercivity maximum.

Phase Transformations And Thermodynamic Properties Of Nanocrystalline Fept Powders , J. Lyubina, O. Gutfleisch, Ralph Skomski, K.-H. Müller, L. Schultz

Nebraska Center for Materials and Nanoscience: Faculty Publications

The solid state reactions and structural evolution in nanocrystalline FePt powders during mechanical ball milling at 77 K and subsequent annealing have been investigated. Above 310 °C the formation of L1₀ FePt is observed. As the milling time increases, the enthalpy evolved during the transformations is reduced, whereas the corresponding activation energy increases. For accelerating the ordering process a fine lamellar structure of Fe and Pt is favourable.

Atomic And Micromagnetic Aspects Of L10 Magnetism, Ralph Skomski, Arti Kashyap, Jian Zhou

Nebraska Center for Materials and Nanoscience: Faculty Publications

Atomic and continuum effects in L1₀ magnets are investigated. Emphasis is on the competition between ferromagnetism, antiferromagnetism, and noncollinear order in both perfect and imperfect structures, and on the temperature dependence of the magnetic anisotropy. The applicability of micromagnetic and atomistic approaches depends on the length scales involved, but there is a broad range of phenomena where both can be used.

Integrating Animal Feeding Strategies Into Cnmp Processes: Role Of Updated Asae Standard D384.2, Richard K. Koelsch, W. Powers, A. L. Sutton

Department of Agricultural and Biological Systems Engineering: Presentations and White Papers

This paper introduces the new ASAE Standard D384.2, Manure Production and Characteristics. This new standard provides an equation-based approach that integrates dry matter and nutrient intake as well as animal performance into the final estimate of total solids, nitrogen, and phosphorus excretion for seven livestock and poultry species. The manure excretion estimates of the new standard are compared with the past ASAE standard as well as other commonly used reference values for three specie groups. Significant differences in excretion are common with the new standard compared to past standards. The paper also details examples of how common industry variations in …

Managing Phosphorus In Beef Feeding Operations, William F. Kissinger, Richard K. Koelsch, Galen E. Erickson, Terry J. Klopfenstein

Department of Agricultural and Biological Systems Engineering: Presentations and White Papers

A commercial feedlot study was conducted to determine manure nutrient flow in six feedlots representing 6,366 cattle. On average, cattle involved in this summary were yearlings (BW = 353 kg) and gained 183 kg over 123 d. It was calculated that 11.5% of the feed nitrogen and 16.9% of the feed phosphorus was retained by the animal with the remaining nutrients excreted. On average, 25.6 kg of N and 4.1 kg of P (DM basis) were excreted per fed beef animal. On average, 887 kg total manure (solids and water) were removed per finished animal (7.2 kg/animal/d) averaging 73% total …

A New Application For Fine Ground Rubber In The Control Of Odors From Livestock Manure Storage Structures, Lakshmi Koppolu, Richard K. Koelsch, Dennis D. Schulte, Crystal Powers, Dwaine Bundy

Department of Agricultural and Biological Systems Engineering: Presentations and White Papers

The purpose of this project was to quantify the odor and gas emission benefits of a fine ground rubber cover on laboratory scale manure storage units and to evaluate the ability of a fine ground rubber cover applied to a commercial swine manure storage unit to remain intact and functional over an extended period of time. A three-inch cover of fine ground rubber reduced odors by 77 to 99 percent from the manure storage tanks over a six-week period. However, consistent reductions of NH₃ emissions were not observed and H₂S emissions from all manure storage treatments were …

Acuta Enews July 2005, Vol. 34, No. 7

ACUTA Newsletters

In This lssue

Meet the ACUTA Board for 2005-2006

Communities of lnterest.................................. Jeri A. Semer, CAE, ACUTA Executive Director

Tech Talk: Advances Opening Up in the World of Storage ............................. Kevin Tanzillo, Dux PR

DC Update Whitney Johnson, Retired, No. Michigan Univ.

11th Circuit Court Reverses Decision on LD Excise Tax .................. Ed Quinn, Ohio State University

FYI: Useful lnformation from the Campus Student Monitor

Member Anniversaries

Board Report ............................ Carmine Piscopo, Providence College

Web Tip: Upload Documents to Resource Library................... Aaron Fuehrer, ACUTA Computer Services Mgr.

Welcome New Members

ACUTA Online Press Room

Uranium Geochemistry In Vadose Zone And Aquifer Sediments From The 300 Area Uranium Plume, John M. Zachara, J. A. Davis, James Mckinley, D. M. Wellman, Chongxuan Liu, N. Qafoku, S. B. Yabusaki

United States Department of Energy: Publications

In 1996, an interim record of decision was issued for the 300-FF-5 Operable Unit on the Hanford Site in southeast Washington State. The record of decision specified the interim remedy as (1) continued monitoring of groundwater and (2) institutional controls to restrict groundwater use. This record of decision was based on a remedial investigation that suggested levels of uranium would decrease with time because of natural geochemical and hydrologic processes. A prediction was made that concentrations of uranium would decrease to the proposed drinking water standard or lower (20 μg/L) in 3 to 10 years from 1993. This prediction has …

Review Of Academy Of Distinguished Teachers, Paul Savory

Department of Industrial and Management Systems Engineering: Reports

The University of Nebraska–Lincoln established the Academy of Distinguished Teachers in 1994. Academy members are to engage in activities to support teaching at UNL. Such activities may include (but were not limited to), speaking about teaching and pedagogy at department, college, campus, state, regional, and national meetings, allowing other faculty to observe one's teaching, and serving in an advisory capacity to the Office of the Senior Vice Chancellor for Academic Affairs on matters related to teaching at UNL. Following my selection into the UNL Academy of Distinguished Teachers in 2004, I explored ideas for how the structure of our campus …

Developing A Shared Vision: Strategic Planning As A Guide To Technology Funding

ACUTA: Other Publications

In December 2004 ACUTA and WTC sent a survey to 768 ACUTA primary members to determine what issues were important on campuses today and what issues respondents felt will be of importance in the next few years. Questions related to management, strategy, infrastructure, technology, organization, polity, and funding. One of the most interesting observations is that the current and five-year rankings are nearly identical- today's concerns are also your concerns for the future. Here are the highlights of our findings:

A cluster of five management issues were rated very close to the same importance. This cluster included developing a vision …

Long Term Monitoring Of A Steel Bridge Constructed Using Phase Constructoin, Aaron Jon Yakel, Paulo Marchon, Atorod Azizinamini

Nebraska Department of Transportation: Research Reports

No abstract provided.

Development Of A Steel Bridge System - Simple For Dead Load And Continuous For Live Load, Atorod Azizinamini, Aaron Jon Yakel, Mohammadreza Farimani

Nebraska Department of Transportation: Research Reports

No abstract provided.

The Phosphoglycolate Phosphatase Gene And The Mutation In The Phosphoglycolate Phosphatase-Deficient Mutant (Pgp1-1) Of Chlamydomonas Reinhardtii, Kensaku Suzuki, Hidenobu Uchida, Tarlan G. Mamedov

Papers in Biochemical Engineering

The sequences of the phosphoglycolate phosphatase (PGPase) gene Pgp1 and the 5′-upstream region from Chlamydomonas reinhardtii wildtype 2137 and the pgp1-1 mutant N142 that lacks the activity of PGPase (PGP1) were determined. The comparison revealed the alteration of a G to A at position 98 relative to the start codon. This destroyed the “GT” splice donor site at the beginning of the first intron of this gene, resulting in an extension of the first exon to 49 translatable codons followed by a stop codon, containing the codons corresponding to whole transit peptide for the chloroplast stroma and the first four …

Giant Electroresistance In Ferroelectric Tunnel Junctions, Mikhail Ye Zhuravlev, Renat F. Sabirianov, Sitaram Jaswal, Evgeny Y. Tsymbal

Materials Research Science and Engineering Center: Faculty Publications

The interplay between the electron transport in metal-ferroelectric-metal junctions with ultrathin ferroelectric barriers and the polarization state of a barrier is investigated. Using a model which takes into account screening of polarization charges in metallic electrodes and direct quantum tunneling across a ferroelectric barrier, we calculate the change in the tunneling conductance associated with the polarization switching. We find the conductance change of a few orders of magnitude for metallic electrodes with significantly different screening lengths. This giant electroresistance effect is the consequence of a different potential profile seen by transport electrons for the two opposite polarization orientations.

Effective Electromechanical Moduli Of Ferroelectric Ceramics With Fiber Textures, Y.C. Zhou, J. Liu, Jiangyu Li

Nebraska Center for Materials and Nanoscience: Faculty Publications

In this letter, we report the predictions on the effective piezoelectric coefficients and electromechanical coupling factors of ferroelectric ceramics BaTiO ₃ and Pb(Mg _1/3Nb _2/3)O ₃–PbTiO ₃ (PMN-PT) with various fiber textures, including [001], [011], and [111], using a two-scale micromechanical model that accounts for microstructural phenomena at both domain and grain levels. It was observed that for BaTiO ₃ the [011] texture is optimal with highest d ₃₁ and d ₃₃, while for PMN-PT [001] texture is optimal despite the fact that [011]-oriented single-crystalline PMN-PT has higher d ₃₂ than that of [001]-oriented PMN-PT single …

Strain Induced Half-Metal To Semiconductor Transition In Gdn, Chun-Gang Duan, Renat F. Sabirianov, Jianjun Liu, Wai-Ning Mei, Peter A. Dowben, J. R. Hardy

Materials Research Science and Engineering Center: Faculty Publications

We investigate the electronic structure and magnetic properties of GdN as a function of unit cell volume. Based on the first-principles calculations of GdN, we observe that there is a transformation in the conduction properties associated with the volume increase: first from half-metallic to semimetallic, then ultimately to semiconducting. We show that applying stress can alter the carrier concentration as well as mobility of the holes and electrons in the majority spin channel. In addition, we found that the exchange parameters depend strongly on lattice constant, thus the Curie temperature of this system can be enhanced by applying stress or …

Jecp/Holz — An Interactive Computer Program For Simulation Of Holz Patterns, Xingzhong Li

Nebraska Center for Materials and Nanoscience: Faculty Publications

In the present work, an interactive computer program for simulation of the HOLZ line patterns, JECP/HOLZ, is reported. A feature of this program is the integration of the simulation of the HOLZ reflections and the HOLZ (curved and straight) lines, which is interactive with respect to changes of the lattice parameter, the accelerator voltage, the zone axis, and the beam tilt. The program can be used as a teaching aid for students as well as a tool for scientists working on electron diffraction experiments.

Positive Spin Polarization In Co/Alo3 /Co Tunnel Junctions Driven By Oxygen Adsorption, Kirill D. Belashchenko, Evgeny Y. Tsymbal, Ivan I. Oleynik, Mark Van Schilfgaarde

Materials Research Science and Engineering Center: Faculty Publications

Using a first-principles Green's function technique, we study spin-dependent tunneling in two model realizations of (111) fcc Co/Al3/Co tunnel junctions assuming O-terminated crystalline epitaxy in the corundum structure. For the first model, which includes 3 O atoms at the interface, the tunneling current is polarized negatively, just as for the clean Co surface. The second model contains additional oxygen atoms inside large pores at each interface. Located at the three-fold hollow adsorption sites, these O atoms bind very strongly to Co. This bonding creates an interface band in the majority-spin channel which strongly enhances the tunneling current in this channel. …

Uv-Vis -Infrared Optical And Afm Study Of Spin-Cast Chitosan Films, W H. Nosal, D. W. Thompson, Sabyasachi Sarkar, Anuradha Subramanian, John A. Woollam, L Yan

Papers in Biotechnology

Optical properties OS spin-cast chitosan films have been determined in the infrared, visible, and ultraviolet region or the spectrum ~tsing spectroscopic ellipsometry. Optical constants for the Vvis-near IR spectra from 130 to 1700 nm were determined using Cauchy dispersion forms com-bined with Lorentzian oscillator models in the absorptive shorler wavelength regions. Infrared ndex of refraction and extinction coefficients from 750 to 4000cm-' were determined using ellip-sometric data fits to dispersion models based on harmonic oscillators. This modeling determined that optical onisotropy was present and measurable over all wavelength regions of ellipsomctric data. To obtain information on the micro- and nano-scale …

Stability Of Transport And Rate Processes [Review], Yaşar Demirel

Papers in Thermal Mechanics

About fifty years ago, the Turing instability demonstrated that even simple reaction-diffusion systems might lead to spatial order and differentiation, while the Rayleigh-Bénard instability showed that the maintenance of nonequilibrium might be the source of order in fluids subjected to a thermodynamic force above a critical value. Therefore, distance from global equilibrium in the form of magnitude of a thermodynamic force emerges as another constraint of stability; some systems may enhance perturbations, and evolve to highly organized states called the dissipative structures after a critical distance on the thermodynamic branch. Although the kinetics and transport coefficients represent short-range interactions, chemical …

Acuta Enews June 2005, Vol. 34, No. 6

ACUTA Newsletters

ln This lssue

From the President................................. Tamara J. Closs, Georgetown University

BICSI to Offer CECs for 52 Conference Sessions

Tech Talk: lP Telephony Changes Dynamics of Security................. Kevin Tanzillo, Dux PR

911 for VolP

Board Report........................ Carmine Piscopo, Providence College

FYI: Useful lnformation from the Campus.......................... Student Monitor

ACUTA Member Sites to See

DC Update................................ Whitney Johnson, Retired, No. Michigan Univ.

Web Tip: Membership Logos Available..................... Aaron Fuehrer, ACUTA Computer Services Mgr.

Welcome New Members

ACUTA Online Press Room

Chromatographic Purification Of Mabs With Non-Affinity Supports, Anuradha Subramanian

Papers in Biotechnology

The introduction of new protein-based therapeutics such as monoclonal antibodies (MAbs), MAb-based vaccines, growth factors and plasma proteins implies the need to study, characterize, and purify. The separation step is likely to be a bottleneck and cost-effective technology will be needed to rectify it. The currently prevalent matrices for chromatographic separation of immunoglobulins (Igs) are based on Protein A or its recombinant versions (Protein G). They display excellent selectivity and specificity, but are expensive. A Protein A matrix costs $8,000 to 12,000 per L-resin. The typical production column volume is 100 L. The million-dollar matrix is far more expensive than …

Using Narrated Powerpoint Presentations For Distance Learning, Paul Savory

Department of Industrial and Management Systems Engineering: Faculty Publications

Dr. Savory highlights his use of narrated powerpoint slides for the development of his distance education course. In addition,he highlight the strucutre and assessment approaches used for his course.

Finite Element Analysis Of Covered Microstents, Linxia Gu, Swadeshmukul Santra, Robert A. Mericle, Ashok V. Kumar

Department of Mechanical and Materials Engineering: Faculty Publications

Currently available neuroendovascular devices are inadequate for effective treatment of many wide-necked or fusiform intracranial aneurysms and intracranial carotid-cavernous fistulae (CCF). Placing a covered microstent across the intracranial aneurysm neck and CCF rent could restore normal vessel morphology by preventing blood flow into the aneurysm lumen or CCF rent. To fabricate covered microstents, our research group has developed highly flexible ultra thin (~150 μm) silicone coverings and elastomerically captured them onto commercially available metal stents without stitching. Preliminary in vivo studies were conducted by placing these covered microstents in the common carotid artery of rabbits. The feasibility of using covered …

Substrate-Mediated Gene Delivery For Assessment Of Signal Transduction Pathways In Cancer Cells, Angela K. Pannier, Zain Bengali, Eric A. Ariazi, V. Craig Jordan, Lonnie D Shea

Department of Agricultural and Biological Systems Engineering: Presentations and White Papers

Gene delivery has the potential to be used in diagnostic applications, specifically to investigate cellular signal transduction pathways responsible for disease. Analysis of multiple pathways or genes in a parallel format can be achieved using a transfected cell array, a high throughput approach to correlate gene expression with functional cell responses, based on gene delivery from a substrate that supports cell adhesion. Substrate-mediated gene delivery functions by self-assembling DNA with nonviral vectors, resulting in positively charged complexes that can interact with a biomaterial or substrate. Cells cultured on the substrate are exposed to elevated DNA concentrations within the local microenvironment, …

Is There A Green Chemistry Approach For Leaching Gold?, Jarnes L. Hendrix

Papers in Sustainable Mining

Over the past fifteen years there has been significant interest in the concepts of sustainable development and mining. Many governments, mining con~panies and non-government organizations have embraced the concepts of sustainable development. One concept generated from the ideas stemming from sustainable mining is that of 'green gold'. Similar to sustainable mining, green gold's meaning is defined by the originator.

Optical Characterization Of Porous Alumina From Vacuum Ultraviolet To Mid-Infrared, Daniel W. Thompson, Paul G. Snyder, Leon Castro, Li Yan, Prasuna Kaipa, John A. Woollam

Department of Electrical and Computer Engineering: Faculty Publications

Porous alumina was fabricated and optically characterized over a wide spectral range. Layers were formed electrochemically in oxalic acid solution from 10-μm-thick aluminum films evaporated onto silicon wafers. The layer formation was monitored with in situ spectroscopic ellipsometry in the visible and near-infrared wavelength range to accurately determine the thickness and dielectric functions. Anisotropy due to the columnar nature of the porous structure was determined using optical modeling. The porous alumina layer was found to have a small but significant absorption tail throughout the visible region. Atomic force microscopy and scanning electron microscopy were used throughout the process to assess …

Influence Of Nitrogen Growth Pressure On The Ferromagnetic Properties Of Cr-Doped Aln Thin Films, Jun Zhang, Xingzhong Li, B. Xu, David J. Sellmyer

Nebraska Center for Materials and Nanoscience: Faculty Publications

We report the magnetic properties of Cr-doped AlN thin films grown by reactive magnetron sputtering under various nitrogen pressures. Ferromagnetism is observed up to the highest temperature measured, 400 K, and shows strong dependence on the Cr concentration and, especially, the nitrogen growth pressure. By varying the nitrogen pressure during film growth, the magnetic properties of the films can be changed while keeping a constant Cr concentration. The ferromagnetism is enhanced in the films that were grown at low nitrogen pressures and thus nitrogen deficient, suggesting an important role of defects in the ferromagnetism of this material.