Engineering Commons^™

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 …

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

Papers in Sustainable Mining

No abstract provided.

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

United States 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 İnan, 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 α-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 …

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

Department of Agricultural and Biological Systems Engineering: Faculty 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. …

Applicationofspectroscopic Ellipsometry To In-Stu. Real-Time Fabrication Of Multiple Layer Alternating High/Low Refractive Index Filters, Blaine D. Johs, Jeffery S. Hale, John A. Woollam, Craig M. Herzinger

Department of Electrical and Computer Engineering: Faculty Publications

Disclosed is application of oblique angle of incidence, reflection and/or transmission mode spectroscopic ellipsometry PSI and/or DELTA, (including combinations thereof and/or mathematical equivalents), vs. wavelength data to monitor and/or control fabrication of multiple layer high/low refractive index band-pass, band-reject and varied attenuation vs. wavelength filters, either alone or in combination with transmissive non-ellipsometric electromagnetic beam turning point vs. layer data obtained at an essentially normal angle of incidence.

Acuta Enews September 2005, Vol. 34, No. 9

ACUTA Newsletters

In This Issue

From ACUTA Headquarters....................... Jeri Semer, CAE, ACUTA Executive Director

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

Tech Talk: Putting Your Software Out in the Open ........................ Kevin Tanzillo, Dux PR

ACUTA Member Site to See

Web Tip: Pop-Up Blockers and the ACUTA Website ............................... Aaron Fuehrer, ACUTA Computer Services Mgr.

One More Conference Winner

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

New Advisory Group on Wireless lssues in Higher Education

ACUTA Audio Seminar: The Rote of Wireless in a Converged Wireless Network

Welcome New Members

ACUTA Events Calendar

Acuta Enews October 2005, Vol. 34, No. 10

ACUTA Newsletters

ln This lssue

'President's Message............................ Patricia Todus, Northwestern University, ACUTA President

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

Tech Talk: Don't Let Data Become Causally of Disaster Kevin Tanzillo, Dux PR

In the Event of an Emergency............................... Rich Lehn, Univ of North Dakota

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

Ownership of Conduits.......................... From the ACUTA Listserv: Benny Kurashima &, Dave Barta

Web Tip: Post Positions Online......................... Aaron Fuehrer, ACUTA information Technology Mgr.

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

Welcome New Members

ACUTA Events Calendar: SPECIAL OFFER

Under Graduate Course Description

Department of Chemical and Biomolecular Engineering: Courses

No abstract provided.

Antiplane Surface Acoustic Waves Propagating In Elastic Half-Space Coated With An Anisotropic Laminate, Xiangfa Wu, Yuris A. Dzenis

Department of Engineering Mechanics: Faculty Publications

Dispersion relation of antiplane surface acoustic waves (SAWs) propagating in elastic half-space coated with an anisotropic laminate was determined explicitly by means of Stroh's formalism within the subsonic range, where is no energy leakage into the substrate. During the procedure, the governing dynamic equation in each anisotropic layer and the displacement–traction continuity at interfaces were exactly satisfied by Stroh's functions. Explicit algebraic equation was derived for determining the dispersion relation. As an example, the wave number vs. phase velocity diagram for steel half-space coated with a graphite-fiber/epoxy laminate with a [± 45°/0°₂] lay-up was demonstrated. The given method …

Substrate-Mediated Delivery From Self-Assembled Monolayers: Effect Of Surface Ionization, Hydrophilicity, And Patterning, Angela K. Pannier, Brian C. Anderson, Lonnie D Shea

Department of Agricultural and Biological Systems Engineering: Faculty Publications

Gene transfer has many potential applications in basic and applied sciences. In vitro, DNA delivery can be enhanced by increasing the concentration of DNA in the cellular microenvironment through immobilization of DNA to a substrate that supports cell adhesion. Substrate-mediated delivery describes the immobilization of DNA, complexed with cationic lipids or polymers, to a biomaterial or substrate. As surface properties are critical to the efficiency of the surface delivery approach, selfassembled monolayers (SAMs) of alkanethiols on gold were used to correlate surface chemistry of the substrate to binding, release, and transfection of non-specifically immobilized complexes. Surface hydrophobicity and ionization were …

Investigating Binder Flushing Of Sp-2 Mixes, Magdy A. Abdelrahman

Nebraska Department of Transportation: Research Reports

No abstract provided.

System And Method Enabling Simultaneous Investigation Of Sample With Two Beams Of Electromagnetic Radiation, John A. Woollam, Galen L. Pfeiffer, Daniel W. Thompson, Blaine D. Johs, Craig M. Herzinger

Department of Electrical and Computer Engineering: Faculty Publications

Disclosed are system and method for a characterizing system consisting of a fluid sample on a two-sided stage, utilizing data obtained by applying, from both sides thereof, beams of electromagnetic radiation to a fluid coated surface in a containing cell volume. The beams can have the same or different wavelength content and/or polarization state and can be applied at the same or different magnitude angles-of-incidence, and a third typically unpolarized beam can be applied at a normal angle-of-incidence.

System And Method Enabling Simultaneous Investigation Of Sample With Two Beams Of Electromagnetic Radation, John A. Woollam, Galen L. Pfeiffer, Daniel W. Thompson, Blaine D. Johs, Craig M. Herzinger

Department of Electrical and Computer Engineering: Faculty Publications

Disclosed are System and method for characterizing a System consisting of a fluid Sample on a two sided Stage, utilizing data obtained by applying, from both sides thereof, beams of electromagnetic radiation to a fluid coated Surface in a containing cell Volume. The beams can have the same or different wavelength content and/or polarization State, and can be applied at the same or different magnitude angles-of-incidence, and a third typically unpolarized beam can be applied at a normal angle-of-incidence.

Effects Of Long-Term Wastewater Application On Chemical Properties And Phosphorus Adsorption Capacity In Soils Of A Wastewater Land Treatment System, Cong Hu, Tian Zhang, Yong Huang, Mohamed F. Dahab, Rao Surampalli

Department of Civil and Environmental Engineering: Faculty Publications

The buildup of phosphorus (P) in the soil is a major factor limiting the operating life of a wastewater land treatment system. In this study, we evaluated changes of chemical properties, P profiles, and adsorption isotherms in the soils of a Muskegon wastewater land treatment system, which has received wastewater for ~30 years. It was found that the pH in the 15-cm topsoil increased from ~5-6 in 1973 to ~7.4-7.8 in 2003; a large amount of salt (e.g., Ca, Mg) in wastewater was adsorbed by the soil; the soil Al content (either exchangeable or oxalate extractable) decreased, while the oxalate-extractable …

Biodiesel Plant Development Seminar, Larry Breeding

Industrial Agricultural Products Center: Publications and Information

CONTENTS:
West Central History
Annual Operations
Sales History (millions)
Soy Nutrition Products
West Central Biodiesel Plant
Why Biodiesel?
Reduce Emissions
Operational Benefits
Energy Balance of Biodiesel
Expanded use for Soy Crops
Nation’s Energy Goals
USES FOR BIODIESEL
RENEWABLE ENERGY GROUP
MANAGEMENT
PROCUREMENT
SALES & MARKETING
SUMMARY

Biodiesel Plant Development Seminar, What You Need To Know

Industrial Agricultural Products Center: Publications and Information

Agenda

Biodiesel Plant Investment—Making The Correct Decisions, Leland Tong, Steve Howell

Industrial Agricultural Products Center: Publications and Information

Overall Purpose of IBFG:
• Provide the most accurate, up-to-date, detailed, independent information on biodiesel and the biodiesel industry
• Provide Information you need to make an intelligent decision on a biodiesel plant….

Biodiesel Plant Development Seminar, What You Need To Know: Technology Processes And Provider Overview, Steve Howell

Industrial Agricultural Products Center: Publications and Information

CONTENTS:
The Transesterification Reaction
Transesterification Material Balance
Esterification of Free Fatty Acid
Biodiesel Production
Biodiesel Technology Providers
Educational Resources
NBB Resources
Other Biodiesel Resources
IBFG

Crosslinked Chitosan: Its Physical Properties And The Effects Of Matrix Stiffness On Chondrocyte Cell Morphology And Proliferation, Anuradha Subramanian, Hsin-Yi Lin

Papers in Biotechnology

Chitosan [<(1-4)-2 amino-2-deoxy-d-glucose], the natural polyaminosaccharide derived from N-deacetylation of chitin [<(1-4)-2 acetamide-2-deoxy-d-glucose], has been shown to possess attractive biological and cell interactive properties. Recently chitosan and chitosan analogs have also been shown to support the growth and continued function of chondrocytes. In the present study, chitosan substrates are crosslinked with a func-tional diepoxide (1,4 butanediol diglycidyl ether) to alter its mechanical property, and the viability and proliferation of the canine articular chondrocytes seeded on the crosslinked surface are further assayed. Of interest is the impact of substrate stiffness on the growth and proliferation of articular canine chondrocytes. Cross linked scaffolds were also sub-jected to degradation by chitosanase to examine the impact of cross linking on enzyme- assisted degradation. The hydrophilicity and compression modulus of the crosslinked sur-faces were measured via contact-angle measurements and compression tests, respec-tively. Scanning electron microscopy (SEM) and fluorescent staining were used to ob-serve the proliferation and morphology of chondrocyte cells on noncrosslinked and crosslinked surfaces. The crosslinked chitosan was found to be nontoxic to chondrocytes and more hydrophilic. Its compression modulus and stiffness increased, which may im-prove the scaffold resistance to wear and in vivo shrinkage once implanted. The in-creased stiffness also seemed to serve as an additional mechanical stimulus to promote chondrocyte growth and proliferation. The cell morphology on crosslinked scaffolds seen by SEM and fluorescent stain was the typical chondrocytic rounded shape. The method proposed provides a nontoxic way to increase the mechanical strength of the chitosan scaffolds.

Purification And Scale-Up Of A Recombinant Heavy Chain Fragment C Of Botulinum Neurotoxin Serotype E In Pichia Pastoris Gs115, Michael P. Dux, Rick Barent, Jayanta Sinha, Mark Gouthro, Todd Swanson, Ardis Barthuli, Mehmet İnan, John T. Ross, Leonard A. Smith, Theresa J. Smith, Robert Webb, Bonnie Loveless, Ian Henderson, Michael M. Meagher

Papers in Biochemical Engineering

A recombinant C-terminus heavy chain fragment from Botulinum neurotoxin serotype E (BoNT/E) is proposed as a vaccine against the serotype E neurotoxin. This fragment, rBoNTE(Hc), was produced intracellular in Pichia pastoris GS115 by a three-step fermentation process, i.e., glycerol batch phase and a glycerol fed-batch phase to achieve high cell densities, followed by a methanol fed-batch induction phase. The rBoNTE(Hc) protein was purified from the soluble fraction of cell lysates using three ion-exchange chromatography steps (SP Sepharose Fast Flow, Q Sepharose Fast Flow, Sp Sepharose High Performance) and polished with a hydrophobic charge induction chromatography step (MEP HyperCel). Method development …

High-Impact, Energy-Absorbing Vehicle Barrier System: U.S. Patent No. Us 6,926,461 B1, Ronald K. Faller, Dean L. Sicking, John R. Rohde, A. Keller, Robert W. Bielenberg, James C. Holloway, Kenneth H. Addink, Karla A. Polivka

Department of Civil and Environmental Engineering: Faculty Publications

A high-impact, energy-absorbing vehicle barrier system generally includes a substantially rigid outer containment wall coupled via cable restraint assemblies with an energy-absorbing inner impact wall, and energy-absorbing cartridges strategically positioned between the impact wall and containment-wall: The impact wall is constructed of a number of rectangular tubes coupled with one another to presents a substantially smooth, uniform surface to passing vehicles. The energy-absorbing cartridges generally consist of a number of foam sheets which compress and crush between the containment wall and impact wall to absorb energy from an errant vehicle striking the face of the impact wall, while the deflection …

Electrohydrodynamic Instability Of Thin Conductive Liquid Films, Xiangfa Wu, Yuris A. Dzenis

Department of Engineering Mechanics: Faculty Publications

This paper considers the effect of surface charges on the surface instability of thin conductive liquid films. A characteristic relation is obtained for determining the wave number of the fastest growing mode as a function of surface tension, dispersive van der Waals force, and electrostatic tractions exerted by the film surface charges. Two natural length scales of the microsystem are further introduced to account for the coupling effects on the dewetting pattern development. The present results can be used for controlled surface pattern modulation in a spinodal-dewetting scenario via amplification of surface waves of selected modes.

Acuta Enews August 2005, Vol. 34, No. 8

ACUTA Newsletters

ln This Issue

Report from the 34th Annual ACUTA Conference

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

From the President...................... Patricia Todus, Northwester Univ., ACUTA President 2005-06

Tech Talk: Passwords: Who Can Keep Them All Straight?..................... Kevin Tanzillo, Dux PR

Domain Names Are Valuable Assets.................... Jeri A. Semer, CAE, ACUTA Executive Director

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

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

Mobile Phones Get Their Own Suffix

Web Tip: Online Facilities & Services Database................ Aaron Fuehrer, ACUTA Computer Service Mgr.

Ashland University Expanding its Universe...................... Teresa Sutter, Ashland University

Welcome New …

Evolutionary Algorithm For The Placement Of Fluid Power Valves On A Valve Stand, Trichy M. Kethara Pasupathy, Ravi Teja Seethamraju, Robert G. Wilhelm

Department of Mechanical and Materials Engineering: Faculty Publications

The choice of placement of fluid power valves on a valve stand and routing by pipes has an impact on operational costs. Choosing the right placement that provides optimum routing configuration or determining the optimum routing for a chosen placement are both computationally hard problems. An evolutionary algorithm (EA), to minimize operational costs while optimizing placement and routing of valves, is developed here. The best practices in the industry are abstracted and implemented in the EA. In this paper, the algorithm and its performance for examples with varying complexities are presented. Our results meet or exceed experienced designers’ solutions.

Experimental Determination Of Probabilistic Edge-Delamination Strength Of A Graphite–Fiber/Epoxy Composite, Xiangfa Wu, Yuris A. Dzenis

Department of Engineering Mechanics: Faculty Publications

Probabilistic edge-delamination strength of a thermosetting polymer composite was studied experimentally in this work. During the procedure, by means of edge-delamination tensile test, the graphite–fiber/epoxy laminate made of unidirectional Toray P7051S- 20Q-1000 prepregs with an optimized lay-up of [12₂/–12₂/0₂]_S was used for examining its probabilistic distributions of the edgedelamination onset stress and the ultimate tensile strength. Acoustic emission (AE) equipment and optical microscope were utilized to capture the edge-delamination initiation and characterize the failure modes during delaminating. Fractographical analysis based on scanning electron microscope (SEM) was conducted for the characterization of the microscopic …

Domain-Wall Magnetoresistance Of Co Nanowires, Renat F. Sabiryanov, Ashok K. Solanki, John D. Burton, Sitaram Jaswal, Evgeny Y. Tsymbal

Materials Research Science and Engineering Center: Faculty Publications

Using density functional theory implemented within a tight-binding linear muffin-tin orbital method we perform calculations of electronic, magnetic, and transport properties of ferromagnetic free-standing fcc Co wires with diameters up to 1.5 nm. We show that finite-size effects play an important role in these nanowires resulting in oscillatory behavior of electronic charge and the magnetization as a function of the wire thickness, and a nonmonotonic behavior of spin-dependent quantized conductance. We calculate the magnetoresistance (MR) of a domain wall (DW) modeled by a spin-spiral region of finite width sandwiched between two semi-infinite Co wire leads. We find that the DW …

Ndor Regression Equations, Branden J. Strahm, David M. Admiraal

Nebraska Department of Transportation: Research Reports

No abstract provided.