Engineering Commons^™

System And Method For Generating Psuedo-Noise Sequences, Sina Balkir, Walter D. Leon Salas, Michael W. Hoffman, Lance C. Pérez

Department of Electrical and Computer Engineering: Faculty Publications

Disclosed is a method for generating psuedo-noise (PN) sequences utilizing a system comprised of a quantizer, and N directly quantized output/input map containing chaotic map cells, each in functional combination with combiner means and an m-bit shift register.

Acuta Enews December 2005, Vol. 34, No. 12

ACUTA Newsletters

In This lssue

From the President............................... Patricia H. Todus, Northwestern University

Two Audio Seminars

Institutional Excellence Award Deadline

Tech Talk: Adjusting the Carburetor on Your Network Engine................. Kevin Tanzillo, Dux PR

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

Web Tip: Resource for Legislative/Regulatory lnfo................ Aaron Fuehrer, ACUTA lnformation Tech. Mgr.

Member Sites to See

lnfo Links............................ Randy Hayes, Univ. of Northern lowa

Board Report.................... Riny Ledgerwood, San Diego State Univ., ACUTA Sec./Treasurer

Thanks to Exhibitors for 2005

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

Welcome New Members

ACUTA Online Press Room

Remembering Sue Fisher

An Ultra Wide Band Simulator Using Matlab/Simulink, Peter Vial, Beata J. Wysocki, Tadeusz A. Wysocki

Department of Electrical and Computer Engineering: Faculty Publications (to 2015)

Ultra Wide Band (UWB) is a promising technology for sensor networks, broadband wireless data access and location finding applications. This study outlines the development and validation of a single transmitter and receiver system across the multipath channel proposed by Saleh-Valenzuela. We have designed and tested a UWB simulator using MATLAB’s Simulink in combination with the Real Time Workshop(RTW) Tool box for Simulink using the Fixed Step Discrete Solvers of RTW which is required to produce executable simulations on multiple computers (both Linux and Microsoft based devices). This paper outlines the basic design and modules chosen for the simulation and compares …

Using Asterisms To Decode Multi-User Mimo Systems, Phillip Conder, Tadeusz A. Wysocki

Department of Electrical and Computer Engineering: Faculty Publications (to 2015)

The area of Multiple Input Multiple Output (MIMO) communications systems has received enormous attention recently as they can provide a roughly linear increase in data rate by using multiple transmit and receive antennas. MIMO combined with an Turbo coding has been shown as a promising way to achieve near capacity for wireless channels. This paper proposes applying an Asterism based decoder to produce an additional multi user access scheme on top of the primary access method for Ad Hoc networks. After reviewing Sphere and Asterism decoding for MIMO systems with a larger number of transmit than receive antennas, this paper …

Background Radio Frequency Interference Measurements For Wireless Devices In The Electricity Supply Industry, Duane Robinson, Tadeusz A. Wysocki, V. Smith, K. Popovski

Department of Electrical and Computer Engineering: Faculty Publications (to 2015)

Incorporation of radio controller units into heavy equipment used in the electricity industry provides numerous advantages including: improved electrical isolation between plant and operator, ability to incorporate an additional remote operator, and reductions in vehicle wiring and hydraulic hoses for equipment control. However, secure operation of vehicles and plant incorporating radio control rely on establishing suitable levels of immunity to possible radio frequency interference. Interference levels in close proximity to high voltage power lines are of special concern to the electricity industry. This paper reports on a preliminary investigation into quantifying the levels of background radio interference at such locations …

Development, Testing And Evaluation Of Ndor' Tl-5 Aesthetic Open Concrete Bridge Rail, Karla A. Polivka, Ronald K. Faller, James C. Holloway, Dean L. Sicking, John R. Rohde

Nebraska Department of Transportation: Research Reports

No abstract provided.

Ferroelectric Switch For Spin Injection, Mikhail Ye. Zhuravlev, Sitaram Jaswal, Evgeny Y. Tsymbal, Renat F. Sabirianov

Materials Research Science and Engineering Center: Faculty Publications

A method for the switching of the spin polarization of the electric current injected into a semiconductor is proposed, based on injecting spins from a diluted magnetic semiconductor through a ferroelectric tunnel barrier. We show that the reversal of the electric polarization of the ferroelectric results in a sizable change in the spin polarization of the injected current, thereby providing a two-state electrical control of this spintronic device. We also predict a possibility of switching of tunneling magnetoresistance in magnetic tunnel junctions with a ferroelectric barrier and coexistence of tunneling magnetoresistance and giant electroresistance effects in these multiferroic tunnel junctions.

Negative Spin Polarization And Large Tunneling Magnetoresistance In Epitaxial Co|Srtio3|Co Magnetic Tunnel Junctions, Julian P. Velev, Kirill D. Belashchenko, Derek A. Stewart, Mark Van Schilfgaarde, Sitaram Jaswal, Evgeny Y. Tsymbal

Materials Research Science and Engineering Center: Faculty Publications

We perform an ab initio study of spin-polarized tunneling in epitaxial Co|SrTiO₃|Co magnetic tunnel junctions with bcc Co(001) electrodes. We predict a large tunneling magnetoresistance in these junctions, originating from a mismatch in the majority- and minority-spin bands both in bulk bcc Co and at the Co|SrTiO₃ interface. The intricate complex band structure of SrTiO₃ enables efficient tunneling of the minority d electrons which causes the spin polarization of the Co|SrTiO₃ interface to be negative in agreement with experimental data. Our results indicate that epitaxial Co|SrTiO₃|Co magnetic tunnel junctions with bcc Co(001) electrodes …

Manure Use Planning Tools For Nebraska, Charles S. Wortmann, Charles A. Shapiro, Richard K. Koelsch, Richard Deloughery

Department of Biological Systems Engineering: Conference Presentations and White Papers

Three computer programs have been developed to facilitate manure use planning. The Nebraska Manure Value Calculator was developed in Excel to ease the calculation of manure value (www.cnmp.unl.edu) for a specific field giving value to needed nutrients and other expected benefits, and with the option of giving value to manure nutrients used in the more distant future. Nebraska MMPAMUP and MMP-CNMP Document Generators are planning tools for animal feeding operations that work with the Purdue University Manure Management Planner (MMP). Microsoft Word documents are generated which contain some boilerplate text that can be edited, popup lists in Word AutoText to …

Are We Addressing The Cause Of Nutrient Problems?, Richard K. Koelsch

Department of Biological Systems Engineering: Conference Presentations and White Papers

Content:

Manure P vs. Crop Land P Use

One-Way Flow of Nutrients Is Underlying Cause

Future NMP Checklist?

Should an NMP Measure Environmental Performance?

Whole Farm Nutrient Balance

Whole Farm N Balance

Phosphorus Inputs to Livestock Systems

Should An NMP Estimate Ammonia Emissions?

Daily Ammonia Emissions from Livestock (36 km grid)

Ammonia Emissions Regulatory Thresholds

Ammonia Emissions – Swine Finishing Operations

Elasticity Of Planar Fiber Networks, Xiangfa Wu, Yuris A. Dzenis

Department of Engineering Mechanics: Faculty Publications

A micromechanics model is proposed for the elasticity of planar fiber networks (FNs). The FN is created by random deposition of linearly elastic straight rods within a region. The rods are bonded rigidly at contacts. Under external in-plane loading, the FN deformation consists of fiber bending, elongation, and contraction. An effective constitutive relation for fiber network is developed by averaging the strain energy dissipated by all possible fiber deformations in all directions. Numerical calculations are performed to analyze the effects of fiber aspect ratio and fiber concentration on the effective stiffness of the planar random FN. Finite element analysis (FEA) …

Acuta Enews November 2005, Vol. 34, No. 11

ACUTA Newsletters

In This Issue

Despite Court Ruling, IRS Will Continue to Assess Tax............... Jeri A. Semer, CAE, ACUTA Executive Dir.

From ACUTA Headquarters: Upcoming ACUTA Surveys............... Jeri A. Semer, CAE, ACUTA Executiver Dir.

ACUTA Directory to Go Online

Tech Talk: WMM Adds Touch of Class to Wireless Networking................ Kevin Tanzillo, Dux PR

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

Web Tip: Pop-Up Blockers................ Aaron Fuehrer, ACUTA Information Technology Mgr.

Info Links.......................... Randy Hayes, University of Northern Iowa

ACUTA Online Press Room

Board Report............. Riny Ledgerwood, San Diego State Univ., ACUTA Secretary/Treasurer

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

Welcome …

Engineering Substrate-Mediated Gene Delivery With Self-Assembled Monolayers, Angela K. Pannier, Lonnie D Shea

Department of Biological Systems Engineering: Conference Presentations and White Papers

Gene transfer has many potential applications in basic and applied sciences, including functional genomics, gene therapy, and tissue engineering. Substrate- mediated delivery, also termed solid phase delivery, describes the immobilization of DNA, complexed with nonviral vectors, to a biomaterial or substrate that supports cell adhesion. A critical component to this process is designing the appropriate interactions between the DNA complexes and substrate. The objective of this study was to investigate gene transfer as a function of i) complex formation and deposition conditions and ii) non-specific and specific binding interactions between the complexes and substrate. The volume and time of complex …

Where’S The Poop? Environmental Challenges For Large And Small Animal Feeding Operations, Richard K. Koelsch, John Lawrence

Department of Biological Systems Engineering: Conference Presentations and White Papers

Content:

Where’s the Poop?

Status and Trends in Small and Mid-Sized Animal Operations in the U.S.

Numbers of farms, animals, & nutrients

Non-confined animals: Farms and AU

Confined animals: Farms and AU

Confined animals: Manure nutrients

Confined animals: Farms with excess manure

AFO Challenges

Bang-for-the-Buck Programming

Least-Squares Finite-Element Scheme For The Lattice Boltzmann Method On An Unstructured Mesh, Yusong Li, Eugene J. Leboeuf, P. K. Basu

Department of Civil and Environmental Engineering: Faculty Publications

A numerical model of the lattice Boltzmann method (LBM) utilizing least-squares finite-element method in space and the Crank–Nicolson method in time is developed. This method is able to solve fluid flow in domains that contain complex or irregular geometric boundaries by using the flexibility and numerical stability of a finite-element method, while employing accurate least-squares optimization. Fourth-order accuracy in space and second-order accuracy in time are derived for a pure advection equation on a uniform mesh; while high stability is implied from a von Neumann linearized stability analysis. Implemented on unstructured mesh through an innovative element-by-element approach, the proposed method …

Self-Assembly Of Nanoparticles On Live Bacterium: An Avenue To Fabricate Electronic Devices, Vikas Berry, Ravi F. Saraf

Papers in Nanotechnology

Recently, hybrid structures of microorganisms with inorganic nanoscale moieties have received great interest due to their potential in fabricating electronic systems. Electronic properties of metal nanoparticles, due to single electron transport of current[1], make them ideal material for nanodevices. Concomitantly, the nanostructure of microorganisms such as bacteria[2], viruses[3;4] and yeast[5] are attractive scaffolds for nanoparticle templating due to surface charge and biological affinities for specific molecules [2-7]. However, the key challenges in building hybrid devices are patterning nanostructures without destroying the biological construct of the microorganism and achieving active integration of biological response to the electrical transport in nanoparticle device. …

Perspective On Indicators Of Sustainability For The Gold And Silver Extraction Industry, Jarnes L. Hendrix

Papers in Sustainable Mining

No abstract provided.

Royal Society Of Chemistry - Gold-Plated Bacteria, Ravi F. Saraf, Vikas Berry

Department of Chemical and Biomolecular Engineering: News Releases

No Abstract

Nebraska Blueprint - Fall 2005

Nebraska Blueprint (Student Publication)

Table of Contents:

Letter from the editor by Frank Pribyl
Contributors
Humanoid robotics
Gravity Galore by Celica Orwig
CGI: Computer Generated Imagery
Learn a word: Hologram
UNL mini baja team

Engineering@Nebraska - Fall 2005

Engineering@Nebraska (Alumni Magazine)

Table of Contents:

Celebrating 10 Years of Educating Young Minds: After 10 years, Edgerton Explorit Center continues the mission of its namesake—to enlighten curious minds and enhance our understanding of the world.
Helping Hands...and Wrists: Professor gives doctors a helping hand with newly patented IntuiTool™
The Greater Good: Service learning allows students to put their education to work for the good of the community.
Cool Under Fire: Second generation of Scherzbergs carries on the tradition of school and service to country.
The Future of Nebraska Engineering: The college’s new strategic plan looks at ways research can serve federal and state …

Damage-Induced Modeling Of Asphalt Mixtures Through Computational Micromechanics And Cohesive Zone Fracture, Yong-Rak Kim, D. H. Allen, D. N. Little

Department of Engineering Mechanics: Faculty Publications

This paper presents a computational micromechanics modeling approach to predict damage-induced mechanical response of asphalt mixtures. Heterogeneous geometric characteristics and inelastic mechanical behavior were taken into account by introducing finite element modeling techniques and a viscoelastic material model. The modeling also includes interface fracture to represent crack growth and damage evolution. The interface fracture is modeled by using a micromechanical nonlinear viscoelastic cohesive-zone constitutive relation. Fundamental material properties and fracture characteristics were measured from simple laboratory tests and then incorporated into the model to predict rate-dependent viscoelastic damage behavior of the asphalt mixture. Simulation results demonstrate that each model parameter …

Nature - Nanotechnology-Live Wire, Ravi F. Saraf, Vikas Berry

Department of Chemical and Biomolecular Engineering: News Releases

No Abstact.

Phase Stability Analysis Using Interval Newton Method With Nrtl Model, Hatice Gecegormez, Yaşar Demirel

Papers in Fluid Mechanics

The Gibbs energy minimization using activity coefficient models and nonlinear equation solution techniques are commonly applied for phase stability problems. However, dependence on the initial estimates and multiple solutions for these highly nonlinear equations are common drawbacks for some of the conventional approaches. We have used interval Newton method with the local composition model of NRTL for the phase stability analysis of 10 binary systems and 2 ternary systems at various feed compositions to locate all the stationary points. Results indicate that the interval Newton method is reliable and efficient.

Effect Of Interface States On Spin-Dependent Tunneling In Fe/Mgo/Fe Tunnel Junctions, Kirill D. Belashchenko, Julian P. Velev, Evgeny Y. Tsymbal

Materials Research Science and Engineering Center: Faculty Publications

The electronic structure and spin-dependent tunneling in epitaxial Fe/MgO/Fe(001) tunnel junctions are studied using first-principles calculations. For small MgO barrier thickness the minority-spin resonant bands at the two interfaces make a significant contribution to the tunneling conductance for the antiparallel magnetization, whereas these bands are, in practice, mismatched by disorder and/or small applied bias for the parallel magnetization. This explains the experimentally observed decrease in tunneling magnetoresistance (TMR) for thin MgO barriers. We predict that a monolayer of Ag epitaxially deposited at the interface between Fe and MgO suppresses tunneling through the interface band and may thus be used to …

Evaluation Of The Use Of Lithium Compounds In Controlling Alkali-Silica Reactivity In Concrete Pavement, Christopher Y. Tuan, Michael T. Kelly, Mark E. Buss

Nebraska Department of Transportation: Research Reports

No abstract provided.

Addressing Our Global Water Future, Center For Strategic And International Studies (Csis), Sandia National Laboratories

US Department of Energy Publications

This White Paper addresses the growing global challenges of dealing with the devastating effects of increasing water scarcity and declining water quality. Across the planet, in developing and developed regions alike, poor governance and mismanagement of natural resources coupled with rising population growth, increasing urbanization, and economic development have led to a growing imbalance between water supply and demand. This imbalance is reaching crisis proportions in many regions. It will have even more significant consequences for economic development, stability and security unless the there is a more dramatic and urgent international response. Several international forums have arisen to address just …

Enhancement Of Protein Secretion In Pichia Pastoris By Overexpression Of Protein Disulfide Isomerase, Mehmet Inan, Dinesh Aryasomayajula, Jayanta Sinha, Michael M. Meagher

Papers in Biochemical Engineering

A potential vaccine candidate, Necator americanus secretory protein (Na-ASP1), against hookworm infections, has been expressed in Pichia pastoris. Na- ASP1, a 45 kDa protein containing 20 cysteines, was directed outside the cell by fusing the protein to the preprosequence of the a-mating factor of Saccharomyces cerevisiae. Most of the protein produced by single copy clones was secreted outside the cell. However, increasing gene copy number of Na-ASP1 protein in P. pastoris saturated secretory capacity and therefore, decreased the amount of secreted protein in clones harboring multiple copies of Na-ASP1 gene. Overexpression of the endoplasmic reticulum (ER) resident, homologous chaperone protein, …

Cgmp Recombinant Fix For Iv And Oral Hemophilia B Therapy, William H. Velander Principal Investigator, Abramson Stephan Lead Investigator, Cooper Julian Lead Investigator, William Dernell Key Person, Mark Manning Lead Investigator, Michael Meagher Lead Investigator, Paul Mohanan Lead Investigator, Timothy Nichols Lead Investigator, Todd Swaanson Key Person, Kevin E. Van Cott

Department of Chemical and Biomolecular Engineering: Funded Proposals

Three specific aims are proposed: Specific Aim # 1. Process engineer and scale-up the recovery and purification of transgenic recombinant human Factor IX. The University of Nebraska-Lincoln Biological Process Development Facility will complete process development and scale-up, and produce clinical grade materials for preclinical studies. The endpoint is a proposed final product specification to help facilitate transfer to current Good Manufacturing Practices compliant production of clinical grade material to support an Investigational New Drug filing with the United States Food and Drug Administration (FDA) leading to clinical trials. Specific Aim #2. Characterize and formulate transgenic recombinant human Factor IX for …

Microbial Quality Of Runoff Following Land Application Of Cattle Manure And Swine Slurry, Jeanette A. Thurston-Enriquez, John E. Gilley, Bahman Eghball

Biological Systems Engineering: Papers and Publications

Concentrations of human health-related microorganisms in runoff from agricultural plots (0.75m x 2m) treated with fresh and aged cattle manure, swine slurry and no manure (control) were determined. Three consecutive simulated rainfall events, producing 35 mm rainfall and separated by 24 h, were carried out for each plot. Fecal indicator (Escherichia coli, enterococci, Clostridium perfringens and coliphage) loads released in rainfall runoff from plots treated with fresh cattle manure, aged cattle manure and swine slurry treatments ranged from 5.52 x 10⁵ to 4.36 x 10⁹, 3.92 x 10⁴ to 4.86 x 10⁸, and 9.63 …

Modified Log–Wake Law For Zero-Pressure-Gradient Turbulent Boundary Layers, Junke Guo, Pierre Y. Julien, Meroney N. Meroney

Department of Civil and Environmental Engineering: Faculty Publications

This paper shows that the turbulent velocity profile for zero-pressure-gradient boundary layers is affected by the wall shear stress and convective inertia. The effect of the wall shear stress is dominant in the so-called overlap region and can be described by a logarithmic law in which the von Karman constant is about 0.4 while the additive constant depends on a Reynolds number. The effect of the convective inertia can be described by the Coles wake law with a constant wake strength about 0.76.A cubic correction term is introduced to satisfy the zero velocity gradient requirement at the boundary layer edge. …