Physical Sciences and Mathematics Commons^™

Preliminary Investigation Of The Extent Of Sediment Contamination In The Lower Grand River, Richard Rediske, Carissa Bertin, Jessica Blunt, Min Qi

Scientific Technical Reports

A preliminary investigation of the nature and extent of sediment contamination in the lower Grand River was performed. Three areas in the lower Grand River exceeded sediment quality guidelines for heavy metals and selected organic chemicals. The locations and parameters of concern are listed below:

Harbor Island (G20). Exceeds sediment PEL values for chromium, lead, nickel, and DDE in the top core section. Deeper core sections were extensively contaminated with heavy metals.

Spring Lake (G6). Exceeds sediment PEL values for chromium, lead, cadmium, nickel, and DDE.

Grand Haven (G12). Exceeds sediment PEL values for chromium and nickel. The sediments at …

Water Resources Review - Fall 1999 Vol 12 No 2, Annis Water Resources Institute

AWRI Reviews

No abstract provided.

A Scintillating Plastic Fiber Tracking Detector For Neutron And Proton Imaging And Spectroscopy, James M. Ryan, John R. Macri, Mark L. Mcconnell, Richard A. Messner, Wenhui Li, Hansford H. Cutlip, Quihua Zheng, Carlos Castaneda, Juan L. Romero

Space Science Center

We report the results of recent calibration data analysis of a prototype scintillating fiber tracking detector system designed to perform imaging, spectroscopy and particle identification on 20 to 250 MeV neutrons and protons. We present the neutron imaging concept and briefly review the detection principle and the prototype description. The prototype detector system records ionization track data on an event-by-event basis allowing event selection criteria to be used in the off-line analysis. Images of acrylic phantoms from the analysis of recent proton beam calibrations (14 to 65 MeV range) are presented as demonstrations of the particle identification, imaging and energy …

Back Circulant Latin Squares And The Influence Of A Set, L. F. Fitina, Jennifer Seberry, G. R. Chaudhry

Faculty of Informatics - Papers (Archive)

We define the notions of nest and influence of a subset of a critical set of a back circulant latin square, and study their properties. We also show that a secret sharing scheme based on a critical set of a latin square is both compartmentalised, and hierachical.

Pythia-Ii: A Knowledge Discovery In Databases System For Managing Performance Data And Recommending Scientific Software, Elias N. Houstis, Ann C. Catlin, John R. Rice, Vassilis S. Verykios, Naren Ramakrishnan

Department of Computer Science Technical Reports

No abstract provided.

An Agent-Based Workflow Management System, Krzysztof Palacz, Dan C. Marinescu

Department of Computer Science Technical Reports

No abstract provided.

Agent-Based Resource Discovery, Kyungkoo Jun, Ladislau Bölöni, Krzysztof Palacz, Dan C. Marinescu

Department of Computer Science Technical Reports

No abstract provided.

Intelligent Qos Support For An Adaptive Video Service, Kyungkoo Jun, Ladislau Boloni, David K.Y. Yau, Dan C. Marinescu

Department of Computer Science Technical Reports

No abstract provided.

The Planet, 1999, Fall, Shane Powell, Huxley College Of The Environment, Western Washington University

The Planet

No abstract provided.

Scwds Briefs: Volume 15, Number 3 (October 1999)

Southeastern Cooperative Wildlife Disease Study: Publications

SCWDS BRIEFS
October 1999
West Nile Virus
Viral Meningitis.
Arthropod-borne virus
EHDV-1 in the Eastern U.S.
Epizootic hemorrhagic disease virus (EHDV) and bluetongue virus (BTV) serogroups.
Insight From Recent EHDV Isolations
EHDV-1 will grow in either CPAE or BHK21 cells.
CWD in Penned Elk in CO and MT
Chronic wasting disease (CWD) of cervids
Scrapie
Bovine spongiform encephalopathy of cattle
Creutzfeld-Jakob disease
Typhus and Flying Squirrels
Southern flying squirrels (Glaucomys volans)
Louse-borne typhus fever
Rickettsia prowazekii
Wildlife Seed Treatment
National Wild Turkey Federation (NWTF)
(1) Corn: Maxim® (fludioxonil) and Apron® (metalaxyl); (2) Wheat: Dividend XL® (difenoconazole and mefenoxam); (3) Sorghum: …

Tampa Bay Estuary Program Partner Action Plans 1995-1999, Tampa Bay Estuary Program

Reports

This initial Action Plan covers the 1995-1999 time frame; thus, substantial progress already has been made in implementing many of the actions contained in the CCMP and some progress has been documented for all of the actions. This combined Action Plan presents a summary of progress made in implementing each of the 41 individual actions contained in the CCMP. In keeping with the flexible management approach advocated in the Plan, partners were not required to comply with rigid reporting guidelines. Instead, they were encouraged to canvass the broad spectrum of bay management activities conducted by their organization and report all …

Critical Behavior Of Disordered Quantum Magnets: The Relevance Of Rare Regions, Rajesh S. Narayanan, Thomas Vojta, Dietrich Belitz, Theodore R. Kirkpatrick

Physics Faculty Research & Creative Works

The effects of quenched disorder on the critical properties of itinerant quantum antiferromagnets and ferromagnets are considered. Particular attention is paid to locally ordered spatial regions that are formed in the presence of quenched disorder even when the bulk system is still in the paramagnetic phase. These rare regions or local moments are reflected in the existence of spatially inhomogeneous saddle points of the Landau-Ginzburg-Wilson functional. We derive an effective theory that takes into account small fluctuations around all of these saddle points. The resulting free energy functional contains a new term in addition to those obtained within the conventional …

Doppler Shift Anisotropy In Small Angle Neutron Scattering, Barbara Ellen Wyslouzil, Gerald Wilemski, Janice L. Cheung, Reinhard Strey, John G. Barker

Physics Faculty Research & Creative Works

The two-dimensional patterns in our small angle neutron scattering (SANS) experiments from rapidly moving aerosols are anisotropic. To test the kinematic theory of two-body scattering that describes the anisotropy, we conducted SANS experiments using a constant source of D₂O aerosol with droplets moving at ~440 m/s, and varied the neutron velocity from 267 to 800 m/s. The theoretically predicted anisotropy of the laboratory scattering intensities agrees well with the experimental results. Based on an analysis of the scattering intensity in the Guinier region, we also determined the particle velocity. The results are in very good agreement with independent …

A Simplified Gaas Polarized Electron Source, H. M. Al-Khateeb, B. G. Birdsey, T. C. Bowen, A. S. Green, M. E. Johnston, Timothy J. Gay

Timothy J. Gay Publications

We report operational and construction details of a simplified GaAs polarized electron source. It is contained in a modified 4.63 in. Conflat four-way cross, and uses a single 56 ℓ /s turbomolecular pump. The design incorporates multiple cesiators to extend source lifetime, a new spring-clamp GaAs crystal mounting design to provide uniform crystal heating, and a very simple tubular 90° electrostatic deflector. We also discuss matters related to preparing, heat cleaning, and activating the GaAs crystal.

Sensitivity Of The North Atlantic Basin To Cyclic Climatic Forcing During The Early Cretaceous, Walter E. Dean, Michael A. Arthur

United States Geological Survey: Staff Publications

Striking cyclic interbeds of laminated dark-olive to black marlstone and bioturbated white to light-gray limestone of Neocomian (Early Cretaceous) age have been recovered at Deep Sea Drilling Project (DSDP) and Ocean Drilling Project (ODP) sites in the North Atlantic. These Neocomian sequences are equivalent to the Maiolica Formation that outcrops in the Tethyan regions of the Mediterranean and to thick limestone sequences of the Vocontian Trough of France. This lithologic unit marks the widespread deposition of biogenic carbonate over much of the North Atlantic and Tethyan seafloor during a time of overall low sealevel and a deep carbonate compensation depth. …

Cross Sections Fall 1999, Department Of Physics And Astronomy

Cross Sections

No abstract provided.

Earth News, Fall 1999, Department Of Earth Science, University Of Northern Iowa.

Earth News

Inside this issue:

--- Earth Science Staff Activities
--- Faculty Research, Publications, and Recognition
--- Profile: Wayne Anderson
--- PRISMS Helps Physic Students "See"
--- UNI Meteorology Students "Chase" Tornadoes in Des Moines
--- Technology Takes classes, teachers into the Next Millenium
--- Gifts to the Department of Earth Science
--- Volcanology Students Study Volcanoes in Italy, Sicily and the Aeolian Islands
--- Spring Trip 2000
--- Gifts to the Department of Earth Science
--- 1999-2000 Scholarship and Award Recipients
--- Earth Science Seminar Series
--- 1999 Earth Science Graduates
--- Student Research Presentations
--- Earth Science Majors
--- Alumni …

Efficient Support For Decision Flows In E-Commerce Applications, Richard Hull, Francois Llirbat, Jianwen Su, Guozhu Dong, Bharat Kumar, Gang Zhou

Kno.e.sis Publications

In the coming era of segment-of-one marketing, decisions about business transactions will be quite intricate, so that customer treatments can be highly individualized, reflecting customer preferences, targeted business objectives, etc. This paper describes a paradigm called “decision flows” for specifying a form of incremental decision-making that can combine a myriad of diverse business factors and be executed in near-realtime. Starting with initial input, a decision flow will iteratively gather and derive additional information until a conclusion is reached. Decision flows can be specified in a rules-based manner that generalizes so-called “business rules” but provides more structure than traditional expert systems. …

Critical It Role In Healthcare: National Agenda, Applications, And Technologies, Jack Corley, Warren Karp, Amit P. Sheth

Kno.e.sis Publications

We share a widely-held vision that tomorrow's health care will be delivered by a distributed team using a knowledge based process that is focused on prevention and wellness. Caregivers will be able to treat and monitor patients where and when needed, capturing data as a natural byproduct of care delivery. Clinical teams with a wide range of skills and expertise will deliver consistent, quality care based on timely, situation-specific knowledge and guidance derived from outcomes evidence. That same knowledge will support advances in healthcare research and education. Home care and remote medicine will increase, reducing the need for high-cost hospitalization. …

Evaluation Of The Enantiomeric Composition Of Amino Acids In Tobacco, John P. Kullman, Xianghong Chen, Daniel W. Armstrong

Chemistry Faculty Research & Creative Works

Despite the fact that several studies have reported the concentrations of various free amino acids in tobacco, their enantiomeric composition is unknown. Both the absolute and enantiomeric compositions of proline, alanine, asparagine, aspartic acid, valine, methionine, leucine, and phenylalanine were determined for three strains of tobacco leaf, three types of smokeless tobacco, and six different blended filtered and nonfiltered reference cigarettes. Some of the highest levels of D-amino acids ever found in agricultural products were observed. Possible mechanisms for the production of these D-amino acids are considered. The relevance of D-amino acids in tobacco is discussed.

Resource Law Notes Newsletter, No. 47, Fall Issue, 1999, University Of Colorado Boulder. Natural Resources Law Center

Resource Law Notes: The Newsletter of the Natural Resources Law Center (1984-2002)

No abstract provided.

Multiphoton Ionization Of V, Cr, Y, La, And Ir Through 0.5-Ps Ultraviolet Laser Pulses, B. Witzel, N. A. Poppadogiannis, Cornelis J. Uiterwaal, H. Schröder, D. Charalambidis

C.J.G.J. Uiterwaal Publications

The two-photon ionization of the metal atoms V, Cr, Y, La, and Ir sputtered by an Ar-ion gun from solid targets has been investigated using linearly polarized laser pulses of 500- fs duration and 248.6-nm (KrF) wavelength in combination with mass spectroscopy that is free of volume effects. A near-resonant ionization process has to be attributed to all five atoms. By fitting analytical solutions of a rate equation model describing the temporal evolution of the ionization process, we can determine absolute values of the one-photon cross sections and saturation intensities.

Enantioselective Synthesis Of Dual Serotonergic Azanoradamantane Sc-52491, Daniel Becker, Robert K. Husa, Alan E. Moormann, Clara I. Villamil

Chemistry: Faculty Publications and Other Works

A racemic synthesis of azanoradamantane (±)-3 was accomplished via Yamamoto's MAD-catalyzed Diels-Alder protocol. Subsequently, a scalable asymmetric synthesis of azanoradamantane benzamide SC-52491 was carried out employing Helmchen's asymmetric Diels-Alder methodology to construct all four contiguous asymmetric centers with the correct relative stereochemistry and in 99.3% e.e.

The Microchannel Flow Of A Micropolar Fluid, Guohua Liu

Doctoral Dissertations

Micro-channel flows have been computed to investigate the influence of Navier-Stokes formulation for the slip-flow boundary condition, and a micro-polar fluid model, respectively.

The results of the slip boundary condition show that the current methodology is valid for slip-flow regime (i.e., for values of Knudsen number less than approximately 0.1). Drag reduction phenomena apparent in some micro-channels can be explained by slip-flow theory. These results are in agreement with some computations and experiments.

An ad hoc micro-polar fluid model is developed to investigate the influence of micro effects, such as micro-gyration, in micro-scale flows. The foundation of the ad hoc …

Pretransitional Behavior Above The Nematic-Isotropic Phase Transition Of An Auxetic Trimer Liquid Crystal, Daeseung Kang, Milind P. Mahajan, Shiyong Zhang, Rolfe G. Petschek, Charles Rosenblatt, Chaobin He, Puwei Lu, A.C. Griffin

Faculty Publications

Static Light scattering and electric field-induced Kerr measurements were performed above the nematic-isotropic phase transition of a terminal-lateral-lateral-terminal negative Poisson ratio trimer. Far both measurements the inverse susceptibility was observed to be nearly linear with temperature, a result inconsistent with our previously reported Kerr data [Phys. Rev. E 58, 2041 (1998)]. [S1063-651X(99)11010-9].

Earth In Four Dimensions: Development Of The Ideas Of Geologic Time And History, Robert F. Diffendal Jr.

School of Natural Resources: Faculty Publications

Changes in ideas and in technology can come about as slow incremental modifications, as well as by major paradigm shifts. In the case of the development of the ideas of geologic history and time, I will try to present these changes broadly and then look at how some of these have affected interpretation of Nebraska geology. Changes of view on three fronts were important in the development of geologic history and time concepts. First is the question of the nature of time. Is time cyclic or is it linear? The Greco-Oriental cultures had a world view based on cosmic cycles, …

Earth In Four Dimensions: Development Of The Ideas Of Geologic Time And History, Robert F. Diffendal Jr.

Robert F. Diffendal, Jr., Publications

Changes in ideas and in technology can come about as slow incremental modifications, as well as by major paradigm shifts. In the case of the development of the ideas of geologic history and time, I will try to present these changes broadly and then look at how some of these have affected interpretation of Nebraska geology. Changes of view on three fronts were important in the development of geologic history and time concepts.

First is the question of the nature of time. Is time cyclic or is it linear? The Greco-Oriental cultures had a world view based on cosmic cycles, …

Impact Of Transmission Impairments On The Teletraffic Performance Of Wavelength-Routed Optical Networks, Byrav Ramamurthy, Debasish Datta, Helena Feng, Jonathan P. Heritage, Biswanath Mukherjee

School of Computing: Faculty Publications

In a wavelength-routed optical network, a transmitted signal remains in the optical domain over the entire route (lightpath) assigned to it between its source and destination nodes. The optical signal may have to traverse a number of crossconnect switches (XCS’s), fiber segments, and optical amplifiers, e.g., erbium-doped fiber amplifiers (EDFA’s). Thus, while propagating through the network, the signal may degrade in quality as it encounters crosstalk at the XCS’s and also picks up amplified spontaneous emission (ASE) noise at the EDFA’s. Since these impairments continue to degrade the signal quality as it progresses toward its destination, the received bit error …

Effect Of Interfacial Mobility On Flexural Strength And Fracture Toughness Of Glass/Epoxy Laminates, T. W. H. Wang, Frank D. Blum, Lokeswarappa R. Dharani

Chemistry Faculty Research & Creative Works

Mechanical testing and surface fractography were used to characterize the fracture of E-glass fiber reinforced epoxy composites as a function of the silane coupling agent used. gamma-Aminopropyltriethoxysilane (APS) and delta-aminobutyltriethoxysilane (ABS) were used because these have been shown to have different interfacial mobilities at multilayer coverage. The values of the properties studied generally increased from untreated c, as determined from a Mode I translaminar fracture toughness tests, for the untreated composites (10.5 ± 0.4 kJ/m2) was lower than that for the ABS-treated composites (14.3 ± 2.1 kJ/m2) which was lower than that for the APS-treated composites (17.1 ± 2.4 kJ/m2). …

Bacterial Magnetosomes: Microbiology, Biomineralization And Biotechnological Applications, Dirk Schlϋer, Richard B. Frankel

Physics

Magnetotactic bacteria orient and migrate along geomagnetic field lines. This ability is based on intracellular magnetic structures, the magnetosomes, which comprise nanometer-sized, membrane-bound crystals of the magnetic iron minerals magnetite (Fe₃O₄) or greigite (Fe₃O₄). Magnetosome formation is achieved by a mineralization process with biological control over the accumulation of iron and the deposition of the mineral particle with specific size and orientation within a membrane vesicle at specific locations in the cell. This review focuses on the current knowledge about magnetotactic bacteria and will outline aspects of the physiology and molecular biology …