Engineering Commons^™

Selection Of Calibration And Verification Data For The Hec-Hms Hydrologic Model, Juraj Cunderlik, Slobodan P. Simonovic

Water Resources Research Report

The main purpose of this report is to summarize the strategy applied for selecting the hydro-climatic data, which will be used for the calibration and verification of the US-ACE Hydrologic Engineering Center’s Hydrologic Modeling System (HEC-HMS). The HEC-HMS model was chosen to be the most appropriate hydrologic modeling tool for achieving the goals set in the Canadian Foundation for Climatic and Atmospheric Sciences (CFCAS) funded project “Assessment of Water Resources Risk and Vulnerability to Changing Climatic Conditions” (“project” hereafter), (Cunderlik, 2003).

Technology And Mathematics Standards: An Integrated Approach, Chris Merrill, Mark Comerford

Publications

The article focuses on the use of standards-based teaching and learning that has been gaining significant attention in the education world. State and national associations now base their specific subject area or discipline solely on standards, i.e., International Technology Education Association (ITEA), National Council of Teachers of Mathematics (NCTM), National Science Education Association (NSEA). Moreover, at the public school level, state boards of education are holding school districts accountable for teaching standards-based curricula. It is with the latter definition in mind that the authors created a standards-based, integrated technology and mathematics lesson using the design and construction of stair systems.

Standards-Based Curriculum Development For Pre-Service And In-Service: A “Partnering” Approach Using Modified Backwards Design, Steve Shumway, Jared Berrett

Publications

The article reports that technology teacher educators across the nation are considering what changes will be made to their pre-service teacher education programs to implement the standards in Standards for Technological Literacy (STL) (ITEA, 2000/2002) and to help future teachers learn to develop and teach curriculum that is based on those standards (Custer& amp; Wright, 2002). A recent survey (Reeve, Nielson,& amp; Meade, 2003) revealed that in Utah, a majority of teachers have a copy of the standards and are supportive of them, but they want help implementing standards-based technology education in their classrooms. Initially, a self-evaluation of the teacher …

Critical Issues And Problems In Technology Education, Robert C. Wicklein

Publications

The article informs that to address the need of identifying a comprehensive base for the critical issues and problems, research was conducted to ascertain the perspectives of classroom teachers, university professors, and supervisors of technology education. In addition, the entire population of 132 university department heads/program leaders in technology teacher education, as well as the total population of 55 state and regional supervisors, were selected to receive the survey questionnaire. The critical problem items, insufficient quantities of qualified technology education teachers, inadequate understanding by administrators and counselors concerning technology education, and inadequate understanding by general populace concerning technology education, were …

Analysis And Implementation Of A Synchronous Buck Converter Used As An Intermediate Stage Of An Hid Ballast, Sergey V. Vernyuk

ETD Archive

The contribution of this thesis is the analysis of a Synchronous Buck converter, used as the second stage (which controls the current through the lamp, and consequently, the lamp power) in a 3-stage High-Intensity Discharge (HID) ballast. Where previously standard Buck converters were used, this new application of the Synchronous Buck converter to a medium-power lighting ballast improves efficiency by operating the converter in a new, modified critical-conduction mode to achieve soft-switching and improve efficiency significantly. The converter and 2-loop controller will be analyzed in the three HID lamp modes of operation: open circuit, short circuit, and power control mode. …

Tests 2162 & 2163: Case Ih Jx 1070c Diesel, Nebraska Tractor Test Lab

Nebraska Tractor Tests

No abstract provided.

Detection Of Antibodies To Squalene Iii. Naturally Occurring Antibodies To Squalene In Humans And Mice, Gary R. Matyas, Mangala Rao, Phillip R. Pittman, Robert Burge, Iris E. Robbins, Nabila M. Wassef, Brandie Thivierge, Carl R. Alving

United States Army: Publications

An ELISA-based assay is described for the measurement of antibodies to squalene (SQE) in human serum and plasma. The assay was adapted from the previously described assay for murine antibodies to SQE (J. Immunol. Methods 267 (2002) 119). Like the murine SQE antibody assay, the human antibody assay used sterile cell culture 96-well plates coated with SQE (20 nmol/well). Phosphate-buffered saline (PBS)–0.5% casein was used as both a blocking agent and dilution buffer. The assay has a high through-put capacity and is reproducible and quantitative. This assay was used to evaluate samples from three different human cohorts. The first cohort …

Biomimetic Model Of Skeletal Muscle Isometric Contraction: I. An Energetic–Viscoelastic Model For The Skeletal Muscle Isometric Force Twitch, C. A. Phillips, D. W. Repperger, A. T. Neidhard-Doll, D. B. Reynolds

United States Air Force: Publications

This paper describes a revision of the Hill-type muscle model so that it will describe the chemo-mechanical energy conversion process (energetic) and the internal-element sti2ness variation (viscoelastic) during a skeletal muscle isometric force twitch contraction. The derivation of this energetic–viscoelastic model is described by a 3rst-order linear ordinary di2erential equation with constant energetic and viscoelastic coe5cients. The model has been implemented as part of a biomimetic model, which describes the excitation–contraction coupling necessary to drive the energetic–viscoelastic model. Finally, the energetic–viscoelastic model is validated by comparing its isometric force–time pro3le with that of various muscles reported in the literature.

Land For Maine's Future Program: Increasing The Return On A Sound Public Investment, Richard Barringer, Hugh Coxe, Jack Kartez, Catherine Reilly, Jonathan Rubin

Economics and Finance

Maine is nowhere a more special place than in the quality of its landscape and the traditions of its land use. Among the mo st privately-owned of all the states, Maine’s natural diversity and beauty combine with its traditions of resource stewardship, open access, and appreciation of nature to distinguish it in the public mind and national imagination. In recent decades, however, these traditions have come under assault from the forces of economic and social change; and the people of Maine have responded. In 1986, Governor Joseph Brennan’s Special Commission on Outdoor Recreation recognized the growing threats to Maine’s natur …

Biogeochemical Transformation Of Fe Minerals In A Petroleum-Contaminated Aquifer, John M. Zachara, Ravi K. Kukkadapu, Paul L. Gassman, Alice Dohnalkova, Jim K. Fredrickson, Todd Anderson

United States Department of Energy: Publications

The Bemidji aquifer in Minnesota, USA is a well-studied site of subsurface petroleum contamination. The site contains an anoxic groundwater plume where soluble petroleum constituents serve as an energy source for a region of methanogenesis near the source and bacterial Fe(III) reduction further down gradient. Methanogenesis apparently begins when bioavailable Fe(III) is exhausted within the sediment. Past studies indicate that Geobacter species and Geothrix fermentens–like organisms are the primary dissimilatory Fe-reducing bacteria at this site. The Fe mineralogy of the pristine aquifer sediments and samples from the methanogenic (source) and Fe(III) reducing zones were characterized in this study to …

Reduction Of Tco4- By Sediment-Associated Biogenic Fe(Ii), James K. Fredrickson, John M. Zachara, David W. Kennedy, Ravi K. Kukkadapu, James P. Mckinley, Steve M. Heald, Chongxuan Liu, Andrew E. Plymale

United States Department of Energy: Publications

The potential for reduction of ⁹⁹TcO₄^-_(aq) to poorly soluble ⁹⁹TcO₂ · nH₂O_(s) by biogenic sediment-associated Fe(II) was investigated with three Fe(III)-oxide containing subsurface materials and the dissimilatory metal-reducing subsurface bacterium Shewanella putrefaciens CN32. Two of the subsurface materials from the U.S. Department of Energy’s Hanford and Oak Ridge sites contained significant amounts of Mn(III,IV) oxides and net bioreduction of Fe(III) to Fe(II) was not observed until essentially all of the hydroxylamine HCl-extractable Mn was reduced. In anoxic, unreduced sediment or where Mn oxide bioreduction was incomplete, exogenous biogenic TcO_{2 …}

Synthesis Of Colloidal Mn2+:Zno Quantum Dots And High-Tc Ferromagnetic Nanocrystalline Thin Films, Nick S. Norberg, Kevin R. Kittilstved, James E. Amonette, Ravi K. Kukkadapu, Dana A. Schwartz, Daniel R. Gamelin

United States Department of Energy: Publications

We report the synthesis of colloidal Mn²⁺-doped ZnO (Mn²⁺:ZnO) quantum dots and the preparation of room-temperature ferromagnetic nanocrystalline thin films. Mn²⁺:ZnO nanocrystals were prepared by a hydrolysis and condensation reaction in DMSO under atmospheric conditions. Synthesis was monitored by electronic absorption and electron paramagnetic resonance (EPR) spectroscopies. Zn(OAc)₂ was found to strongly inhibit oxidation of Mn²⁺ by O₂, allowing the synthesis of Mn2+:ZnO to be performed aerobically. Mn2+ ions were removed from the surfaces of as-prepared nanocrystals using dodecylamine to yield high-quality internally doped Mn2+:ZnO colloids of nearly spherical shape …

Assessing Conceptual Models For Subsurface Reactive Transport Of Inorganic Contaminants, J.A. Davis, S.B. Yabusaki, C.I. Steefel, John M. Zachara, G.P. Curtis, G.D. Redden, L.J. Criscenti, B.D. Honeyman

United States Department of Energy: Publications

In many subsurface situations where human health and environmental quality are at risk (e.g., contaminant hydrogeology, petroleum extraction, carbon sequestration, etc.), scientists and engineers are being asked by federal agency decision-makers to predict the fate of chemical species under conditions where both reactions and transport are processes of first-order importance.

In 2002, a working group (WG) was formed by representatives of the U.S. Geological Survey, Environmental Protection Agency,Department of Energy,Nuclear Regulatory Commission, Department of Agriculture,and Army Engineer Research and Development Center to assess the role of reactive transport modeling (RTM) in addressing these situations. Specifically, the goals of the WG …

Cryogenic Laser Induced Fluorescence Characterization Of U(Vi) In Hanford Vadose Zone Pore Waters, Zheming Wang, John M. Zachara, Wassana Yantasee, Paul Gassman, Chongxuan Liu, Alan Joly

United States Department of Energy: Publications

Ambient and liquid helium temperature laser-induced time-resolved uranyl fluorescence spectroscopy was applied to study the speciation of aqueous uranyl solutions containing carbonate and phosphate and two porewater samples obtained by ultracentrifugation of U(VI)-contaminated sediments. The significantly enhanced fluorescence signal intensity and spectral resolution found at liquid helium temperature allowed, for the first time, direct fluorescence spectroscopic observation of the higher aqueous uranyl complexes with carbonate: UO₂(CO₃)₂ ^2-, UO₂(CO₃)₃ ^4-, and (UO₂)₂(OH)₃CO₃ ^-. The porewater samples were non-fluorescent at room temperature. …

Microscale Distribution Of Cesium Sorbed To Biotite And Muscovite, James Mckinley, John M. Zachara, Steven Heald, Alice Dohnalkova, Matthew Newville, Steve Sutton

United States Department of Energy: Publications

Individual 1-3 mm biotite and muscovite clasts from Hanford sediment were contacted with 0.08 M CsNO₃. They were examined using electron or X-ray microprobe methods, as intact specimens or sectioned perpendicular to their basal planes. Cs+ was observed to preferentially sorb to mica edges, steps on mica surfaces, or fractured regions. The localization of Cs conformed to hypothesized strong binding to frayed edge sites in preference to sites on basal planes. In section, Cs⁺ was found to penetrate the mica interior, forming discrete zones of concentration, particularly in muscovite. In biotite, Cs was more abundant, permeating the …

Spectroscopic And Diffraction Study Of Uranium Speciation In Contaminated Vadose Zone Sediments From The Hanford Site, Washington State, Jeffrey Catalano, Steven Heald, John M. Zachara, Gordon Brown Jr.

United States Department of Energy: Publications

Contamination of vadose zone sediments under tank BX-102 at the Hanford site, Washington, resulted from the accidental release of 7-8 metric tons of uranium dissolved in caustic aqueous sludge in 1951. We have applied synchrotron-based X-ray spectroscopic and diffraction techniques to characterize the speciation of uranium in samples of these contaminated sediments. U L_III-edge X-ray absorption fine structure (XAFS) spectroscopic studies demonstrate that uranium occurs predominantly as a uranium- (VI) silicate from the uranophane group of minerals. XAFS cannot distinguish between the members of this mineral group due to the near identical local coordination environments of uranium in …

Biogeochemical Transformation Of Fe Minerals In A Petroleum-Contaminated Aquifer, John M. Zachara, Ravi K. Kukkadapu, Paul Gassman, Alice Dohnalkova, James K. Fredrickson, Todd Anderson

United States Department of Energy: Publications

The Bemidji aquifer in Minnesota, USA is a well-studied site of subsurface petroleum contamination. The site contains an anoxic groundwater plume where soluble petroleum constituents serve as an energy source for a region of methanogenesis near the source and bacterial Fe(III) reduction further down gradient. Methanogenesis apparently begins when bioavailable Fe(III) is exhausted within the sediment. Past studies indicate that Geobacter species and Geothrix fermentens–like organisms are the primary dissimilatory Fe-reducing bacteria at this site. The Fe mineralogy of the pristine aquifer sediments and samples from the methanogenic (source) and Fe(III) reducing zones were characterized in this study to …

Chromium Speciation And Mobility In A High Level Nuclear Waste Vadose Zone Plume, John M. Zachara, Calvin Ainsworth, Gordon Brown Jr., Jeffery Catalano, James Mckinley, Odeta Qafoku, Steven Smith, James Szecsody, Sam Traina, Jeffrey Warner

United States Department of Energy: Publications

Radioactive core samples containing elevated concentrations of Cr from a high level nuclear waste plume in the Hanford vadose zone were studied to assess the future mobility of Cr. Cr(VI) is an important subsurface contaminant at the Hanford Site. The plume originated in 1969 by leakage of self-boiling supernate from a tank containing REDOX process waste. The supernate contained high concentrations of alkali (NaOH ≈ 5.25 mol/L), salt (NaNO₃/NaNO₂ >10 mol/L), aluminate [Al(OH)₄ ⁻ = 3.36 mol/L], Cr(VI) (0.413 mol/L), and ¹³⁷Cs⁺(6.51 X 10^-5 mol/L). Water and acid extraction of the oxidized …

Dissolution Of Uranyl Microprecipitates In Subsurface Sediments At Hanford Site, Usa, Chongxuan Liu, John M. Zachara, Odeta Qafoku, James Mckinley, Steve M. Heald, Zheming Wang

United States Department of Energy: Publications

The dissolution of uranium was investigated from contaminated sediments obtained at the US. Department of Energy (U.S. DOE) Hanford site. The uranium existed in the sediments as uranyl silicate microprecipitates in fractures, cleavages, and cavities within sediment grains. Uranium dissolution was studied in Na, Na-Ca, and NH₄ electrolytes with pH ranging from 7.0 to 9.5 under ambient CO₂ pressure. The rate and extent of uranium dissolution was influenced by uranyl mineral solubility, carbonate concentration, and mass transfer rate from intraparticle regions. Dissolved uranium concentration reached constant values within a month in electrolytes below pH 8.2, whereas concentrations continued …

Scintillator Detectors For Scanning Transmission X-Ray Microscopes At The Advanced Light Source, S. Fakra, A. L. D. Kilcoyne, Tolek Tyliszczak

United States Department of Energy: Publications

The choice of x-ray detectors presents a challenge for scanning transmission x-ray microscopes (STXM). The ultimate detector for the ALS STXMs should have a very high efficiency over a wide energy range, single photon counting capabilities up to 1GHz, high rejection of red laser light, fast response, and work in both vacuum and at atmospheric pressure. The results of an investigation using a photomultiplier tube (PMT) with a number of different scintillators are presented. The PMT is used in photon counting and analog modes. Scintillators used for this study include commercially available phosphor powders and various single crystals.

Unique Electron Polarimeter Analyzing Power Comparison And Precision Spin-Based Energy Measurement, J. Grames, C. K. Sinclair, J. Mitchell, E. Chudakov, H. Fenker, A. Freyberger, D.W. Higinbotham, M. Poelker, M. Steigerwald, M. Tiefenback, C. Cavata, S. Escoffier, F. Marie, T. Pussieux, P. Vernin, S. Danagoulian, V. Dharmawardane, R. Fatemi, K. Joo, M. Zeier, V. Gorbenko, R. Nasseripour, B. Raue, R. Suleiman, B. Zihlmann

United States Department of Energy: Publications

Precision measurements of the relative analyzing powers of five electron beam polarimeters, based on Compton, Møller, and Mott scattering, have been performed using the CEBAF accelerator at the Thomas Jefferson National Accelerator Facility (Jefferson Laboratory). A Wien filter in the 100 keV beam line of the injector was used to vary the electron spin orientation exiting the injector. High statistical precision measurements of the scattering asymmetry as a function of the spin orientation were made with each polarimeter. Since each polarimeter receives beam with the same magnitude of polarization, these asymmetry measurements permit a high statistical precision comparison of the …

Spin- And Angle-Resolved Spectroscopy Of S 2P Photoionization In The Hydrogen Sulfide Molecule, G. Turri, G. Snell, B. Langer, M. Martins, E. Kukk, S. E. Canton, R. C. Bilodeau, N. Cherepkov, John D. Bozek, A. L. D. Kilcoyne, N. Berrah

United States Department of Energy: Publications

Angle- and spin-resolved photoelectron spectroscopy with circularly and linearly polarized synchrotron radiation were used to study the electronic structure of the hydrogen sulfide molecule. A strong effect of the molecular environment appears in the spin-resolved measurements and, although less clearly, in the angular distribution of the sulfur 2 p photoelectrons. The anisotropy and spin parameters of the three main spectral components have been obtained. The validity of simple atomic models in explaining the results is discussed.

Methodology For Estimating Removable Quantities Of Agricultural Residues For Bioenergy And Bioproduct Use, Richard Nelson, Marie Walsh, John Sheehan, Robin Graham

United States Department of Energy: Publications

A methodology was developed to estimate quantities of crop residues that can be removed while maintaining rain or wind erosion at less than or equal to the tolerable soil-loss level. Six corn and wheat rotations in the 10 largest corn-producing states were analyzed. Residue removal rates for each rotation were evaluated for conventional, mulch/reduced, and no-till field operations. The analyses indicated that potential removable maximum quantities range from nearly 5.5 million dry metric t/yr for a continuous corn rotation using conventional till in Kansas to more than 97 million dry metric t/yr for a corn-wheat rotation using no-till in Illinois.

Heterotrophic Plate Count Bacteria—What Is Their Significance In Drinking Water?, Martin J. Allen, Stephen C. Edberg, Donald J. Reasoner

United States Environmental Protection Agency: Publications

While the literature documents the universal occurrence of heterotrophic plate count (HPC) bacteria in soils, foods, air, and all sources of water, there is a lingering question as to whether this group of organisms may signal an increased health risk when elevated populations are present in drinking water. This paper reviews the relevant literature on HPC bacteria in drinking water, the lack of clinical evidence that elevated populations or specific genera within the HPC flora pose an increased health risk to any segment of the population, and the appropriate uses of HPC data as a tool to monitor drinking water …

Nebraska Summary: S462 Case-Ih Jx85, Nebraska Tractor Test Lab

Nebraska Tractor Tests

ABOUT THE TEST REPORT AND USE OF THE DATA The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data. EXPLANATION OF THE TEST PROCEDURES Purpose The purpose of …

Virtual Exploration Of A Cardiovascular System, Elke Moritz, Thomas Wischgoll, Joerg Meyer

Computer Science and Engineering Faculty Publications

No abstract provided.

Overview Of Metal-On-Polyethylene, Metal-On-Metal, And Ceramic Hip Wear Mechanisms, A. Buford, Tarun Goswami

Biomedical, Industrial & Human Factors Engineering Faculty Publications

Premature failure of orthopaedic hip implants caused by multiple wear mechanisms is the primary failure mode of prosthetic hips. Wearing of the implants may lead to aseptic loosening, biological incompatibilities, and mechanical failure of the implant. In order to prevent or restrict the effects of the wear mechanisms, multiple laboratory studies are being conducted in order to determine each mechanism and its contribution to increased wear rates. This paper combines previous laboratory studies related to the wear of metal-onpolyethylene, metal-on-metal, and ceramic materials. The bulk quantity materials discussed include cobalt chromium alloys, stainless steels, zirconium oxide ceramics, and polyethylene materials …

Engineering Mechanics Department Newsletter -- Winter 2004

Department of Engineering Mechanics: Information

Engineering Mechanics Hosts National Conference
Dzenis Awarded McBroom Professorship
EM Faculty News
EM Faculty Earn College Awards
EM Blackshirts
EM Mourns the Loss of Two Emeriti: Ralph Ekstrom 1923-2003 and Walter Erbach 1919-2003

High-Resolution Touch Sensor Could Be Boon To Cancer Surgeons, Others

Department of Chemical and Biomolecular Engineering: News Releases

Lincoln, Neb., June 8, 2006 -- One of the trickiest decisions facing a cancer surgeon today is where to stop cutting. The surgeon doesn't want to stop too soon and leave cancer cells in the patient's body, but he or she also doesn't want to take too many cells and do unnecessary damage to organs. That decision could soon be made much easier, though, thanks to a high-resolution touch sensor developed by chemical engineers at the University of Nebraska-Lincoln that may allow surgeons to tell at the level of a single layer of cells whether or not they have excised …

Orthogonal Spreading Sequences Constructed Using Hall’S Difference Set, Jennifer Seberry, Le Chung Tran, Yejing Wang, Beata J. Wysocki, Tadeusz Wysocki, Ying Zhao

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

In the paper we propose a new set of orthogonal spreading sequences based on the Hadamard matrix of order 32 constructed using the Hall difference set. The proposed sequences are characterised by low peaks in the aperiodic cross-correlation functions and have also good aperiodic auto-correlation properties.