Physical Sciences and Mathematics Commons^™

A Distance-Based Semantic Search Algorithm For Peer-To-Peer Open Hypermedia Systems, Jing Zhou, Vijay Dialani, David De Roure, Wendy Hall

Vijay Dialani

We consider the problem of content management in dynamically created collaborative environments. We describe the problem domain with the aid of a collaborative application in Open Hypermedia Systems, which allows individual users to share their link databases, otherwise known as linkbases. The RDF specification is utilised to express and categorise resources stored in a linkbase. This paper describes a semantic search mechanism to discover semantically related resources across such distributed linkbases. Our approach differs from the traditional crawler based search mechanism since it relies on the clustering of semantically related entities to expedite the search for resources in a randomly …

Spatial And Temporal Variability In The Amount And Source Of Dissolved Organic Carbon: Implications For Ultraviolet Exposure In Amphibian Habitats, Paul D. Brooks, Catherine M. O'Reilly, Stephen A. Diamond, Don H. Campbell, Roland Knapp, David Bradford, Paul Stephen Corn, Blake Hossack, Kathy Tonnessen

United States Geological Survey: Staff Publications

The amount, chemical composition, and source of dissolved organic carbon (DOC), together with in situ ultraviolet (UV-B) attenuation, were measured at 1–2 week intervals throughout the summers of 1999, 2000, and 2001 at four sites in Rocky Mountain National Park (Colorado). Eight additional sites, four in Sequoia and Kings Canyon National Park/John Muir Wilderness (California) and four in Glacier National Park (Montana), were sampled during the summer of 2000. Attenuation of UV-B was significantly related to DOC concentrations over the three years in Rocky Mountain (R² = 0.39, F = 25.71, P < 0.0001) and across all parks in 2000 (R² = 0.44, F = 38.25, P …

Why Should Students Do Research?, Bruce R. Branchini

Convocation Addresses

No abstract provided.

Context-Aware Semantic Association Ranking, Boanerges Aleman-Meza, Chris Halaschek, I. Budak Arpinar, Amit P. Sheth

Kno.e.sis Publications

Discovering complex and meaningful relationships, which we call Semantic Associations, is an important challenge. Just as ranking of documents is a critical component of today's search engines, ranking of relationships will be essential in tomorrow's semantic search engines that would support discovery and mining of the Semantic Web. Building upon our recent work on specifying types of Semantic Associations in RDF graphs, which are possible to create through semantic metadata extraction and annotation, we discuss a framework where ranking techniques can be used to identify more interesting and more relevant Semantic Associations. Our techniques utilize alternative ways of specifying the …

Anisotropic Inflation And The Origin Of Four Large Dimensions, Christian Armendariz-Picon, Vikram Duvvuri

Physics - All Scholarship

In the context of (4+d)-dimensional general relativity, we propose an inflationary scenario wherein 3 spatial dimensions grow large, while d extra dimensions remain small. Our model requires that a self-interacting d-form acquire a vacuum expectation value along the extra dimensions. This causes 3 spatial dimensions to inflate, whilst keeping the size of the extra dimensions nearly constant. We do not require an additional stabilization mechanism for the radion, as stable solutions exist for flat, and for negatively curved compact extra dimensions. From a four-dimensional perspective, the radion does not couple to the inflaton; and, the small amplitude of the CMB …

A Model Of Zebra Emission In Solar Type Iv Radio Bursts, J. Labelle, R. A. Treumann, P. H. Yoon, M. Karlicky

Dartmouth Scholarship

Solar type IV radio bursts present a theoretical challenge because they are composed of both continuum emission and fine structures. The latter include "zebra bursts," which appear as harmonically spaced multiplets that shift in frequency with time. Similarities between these features and terrestrial auroral emissions suggest a new model to explain zebra-structured type IV emissions. In this model, the basic generation mechanism is identical with that proposed by Winglee and Dulk: mode conversion of Z-mode waves generated by the cyclotron maser mechanism under the condition fuh = Nfce, with N an integer; however, we propose a twist …

Great Plains Workshop Held To Prepare For Usarray Deployment, Mary S. Hubbard, S. S. Gao, K. H. Liu, K. E. Nicolaysen, C. G. Oviatt

Geosciences Faculty Publications

Relative to most parts of North America, the Great Plains region, which is bordered by the Rocky Mountain Front on the west and the Mississippi River on the east, has been understudied in terms of the structure, formation, and evolution of the underlying crust, mantle, and core. The anticipated arrival of the USArray portable seismic stations, which will cover the entire United States regardless of surface geology and tectonic activities, and the deployment of the accompanying flexible array stations and the permanent seismic stations in this area, will fill this gap and address numerous problems related to the structure and …

Seismicity In The Vicinity Of Yucca Mountain, Nevada, For The Period October 1, 2001 To September 30, 2002, David H. Von Seggern, Kenneth Smith, James N. Brune, Richard Quittmeyer, Amy J. Smiecinski

Publications (YM)

Starting on October 1, 1995, the monitoring of seismicity within the southern Great Basin near Yucca Mountain was performed with a new digital network. This network features three-component recording with 24-bit A/D conversion in the field. Continuous data are collected at 20 sps, and event triggered windows are collected at 100 sps. A seismic bulletin of events is made by automatically associating triggers among stations, classifying the local earthquake events, and locating the earthquakes and computing their magnitudes with conventional methods. This report covers the operational and seismic results of the seventh year (FY02) of the digital network monitoring. The …

Towards Multi-Stakeholder Cooperation In Wildlife Management, Brian E. Henshaw

Bird Strike Committee-USA/Canada Joint Annual Meeting: 5th (2003)

Wildlife management at airports presents a myriad of challenges. Familiar to many in the field, is the outwitting of wily coyotes, the outsmarting of persistent birds and the outflanking of troublesome deer. Deterrents to barriers, dogs to pyrotechnics, habitat management to habitat removal, an array of increasingly effective measures can be used as part of integrated wildlife management programs to meet the challenge of increasing suburban wildlife populations and their interactions with air traffic. On or off the airfield, the objectives of all stakeholders will not be consistent with best management practices for wildlife management. This is increasingly likely outside …

Risk Analysis Of High-Speed Aircraft Departures Below 10,000 Feet, Bruce Mackinnon, Richard Sowden (Capt.), Terry Kelly

Bird Strike Committee-USA/Canada Joint Annual Meeting: 5th (2003)

This paper abridges a Canadian study that examined bird-related safety risks to aircraft climbing to 10,000 feet MSL (mean sea level) at speeds in excess of 250 kias (knots indicated airspeed). The study employed a risk-based framework to examine ornithological information, bird strike data, aircraft-certification standards, aircraft climb performance and aircraft flight profiles. Foremost among its findings, the study determined that populations of high-risk bird species are increasing, that many of these species flock at the altitudes in question, and that aircraft exposure to risk will increase in part because of projected increases in aircraft movements. Examining the appropriateness of …

Fear And Loathing: The Modulatory Effect Of Stress On Memory Formation And Its Wildlife Management Implications, Arla G. Hile

Bird Strike Committee-USA/Canada Joint Annual Meeting: 5th (2003)

An ongoing challenge for wildlife managers is that target species habituate to or forget about hazing, even though the animals must be somewhat stressed by the hazing. Although stress and efficient memory formation/retrieval are considered to be incompatible, research suggests that the effect of stress on memory is complex. Mild and intense stress can impair memory formation and chronic stress can disrupt memory retrieval. Intermediate stress, however, actually enhances the formation of new memories, particularly long-term memories. Unfortunately, these conclusions are based data from only a very few domesticated species under highly controlled conditions. In nature the variation in baseline …

An Automated Acoustic System To Monitor And Classify Birds, C. Kwan, K. Ho, G. Mei, Y. Li, Z. Ren, R. Xu, G. Zhao, M. Stevenson, V. Stanford, C. Rochet

Bird Strike Committee-USA/Canada Joint Annual Meeting: 5th (2003)

Collisions between aircraft and birds have become an increasing concern for human health and safety. More than four hundred people and over four hundred aircraft have been lost globally in recent years, according to a FAA report. To minimize the number of birdstikes, microphone arrays have been used to monitor birds near the airport or some critical locations in the airspace. However, the range of existing arrays is only limited to a few hundred meters. Moreover, the identification performance in low signal-to-noise environment is not satisfactory. Under the support of the US Air Force, Intelligent Automation, Incorporated (IAI) and the …

Application Of Gis Technologies To Wildlife Management At Dfw Airport, Edwin E. Herricks, Jonathan R. B. Fisher, Curt Kuehner, Michael J. Hovan

Bird Strike Committee-USA/Canada Joint Annual Meeting: 5th (2003)

As part of a continuing FAA research program in wildlife hazard assessment and management at airports, a GIS Technical Element – DFW was developed for the Wildlife Hazard Advisory System (WHAS). For the DFW GIS data layers were obtained from public sources and supplemented with airport specific information. Data themes were developed to support general analysis of wildlife habitat on the AOA and adjacent airport property, and analysis was extended to a distance of 25 miles from the airport to accommodate all aircraft in high risk airspace. Over 10,000 wildlife report records were integrated with data on birdstrikes and runway …

The Relationship Of Military Aircraft Activity To Raptors In Central Labrador, Dawn K. Laing, David M. Bird, Tony E. Chubbs, Maj. Gary Humphries

Bird Strike Committee-USA/Canada Joint Annual Meeting: 5th (2003)

Central Labrador is a notable breeding area for Osprey (Pandion haliaetus) and Bald Eagles (Haliaetus leucocephalus). It is also the location of the North Atlantic Treaty Organization’s (NATO) Low level Training Area (LLTA) for fighter aircraft, covering an area of approximately 130,000 km2 over Labrador and north-eastern Québec. Currently, military aircraft based in Goose Bay, Labrador annually conduct 5,000-7,000 sorties and are permitted to conduct up to 18,000 per flying season (DND 1995). The interaction between the two is frequently fatal for the bird and potentially so for the aircraft and pilot. Since the early 1990s, the Department of National …

A Model For Assessing Bird Strike Risk At Proposed New Airports, Jenny Bell, Niall H. K. Burton, Richard Walls, Andy J. Musgrove, Mark M. Rehfish, John Allan, George Wattola

Bird Strike Committee-USA/Canada Joint Annual Meeting: 5th (2003)

There are many criteria which need to be assessed when carrying out site selection for new airport developments. One of those which should be assessed is prospective bird hazard and bird strike risk – unfortunately, this is rarely considered as a factor. One reason for this may be the lack of available methodology for such work. This paper presents the methodology used during a recent hazard assessment for a proposed new airport for London. The methodology builds on previously described risk assessment techniques, which were developed for operational airports. It allows an assessment of the likelihood of bird strikes to …

Through A Bird’S Eye – Exploring Avian Sensory Perception, Robert C. Beason

Bird Strike Committee-USA/Canada Joint Annual Meeting: 5th (2003)

For too many birds their environment includes airfields and aircraft. Knowing avian sensory abilities, researchers can design experiments and develop new devices and techniques to deter birds from aircraft on and away from airfields. How birds perceive the world about them determines many choices, including foraging, predator avoidance, and flight. Most experiments to investigate the sensory abilities of birds have been developed and analyzed using only human sensory capabilities, which often differ markedly from those of birds. My objective is to review and synthesize what is known and what is unknown about avian sensory capabilities. Compared with humans, birds can …

Risk-Based Modeling To Develop Zoning Criteria For Land-Use Near Canadian Airports, Rolph A. Davis, Terry Kelly, Richard Sowden, Bruce Mackinnon

Bird Strike Committee-USA/Canada Joint Annual Meeting: 5th (2003)

Land development in the vicinity of airports often leads to land-use that can attract birds that are hazardous to aviation operations. For this reason, certain forms of land-use have traditionally been discouraged within prescribed distances of Canadian airports. However, this often leads to an unrealistic prohibition of land-use in the vicinity of airports located in urban settings. Furthermore, it is often unclear that the desired safety goals have been achieved. This paper describes a model that was created to assist in the development of zoning regulations for a future airport site in Canada. The framework links land-use to bird-related safety-risks …

The National Wildlife Strike Database For The Usa: 1990 To 2002 And Beyond, Sandra E. Wright, Richard A. Dolbeer

Bird Strike Committee-USA/Canada Joint Annual Meeting: 5th (2003)

The National Wildlife Strike Database for Civil Aviation in the USA became operational in 1995 with the initiation of data entry of all strikes beginning in 1990. Since 1995, approximately 46,600 reported strikes from 1990-2002 involving civil aircraft in the USA or for USA carriers in foreign countries have been entered into the database. About 97% of the reported strikes have involved birds and 3% have been with mammals or reptiles. Over 2,000 reported strikes have indicated substantial damage to the aircraft. The database has proven to be an extremely useful source of objective information on the extent and nature …

Are Birds Scared By Rotating Mirrors?, Thomas W. Seamans, Scott C. Barras, Zachary J. Patton

Bird Strike Committee-USA/Canada Joint Annual Meeting: 5th (2003)

Blackbirds (Icteridae) create human health and safety concerns when roosting in large numbers near airports or other urban areas. Therefore, there is considerable demand for effective nonlethal techniques to deter these birds. We tested the effectiveness of rotating mirrors (Peaceful Pyramid®) to keep blackbirds away from decoy traps. Mirrors were in place on traps for 5 consecutive days with control traps having similar a device in place but without mirrors. The total number of birds captured in traps with clear mirrors and control traps did not (P = 0.62) differ. When red mirrors were used, the total number of birds …

Gis And Wildlife Management Activities At Airports, Shelley Gray

Bird Strike Committee-USA/Canada Joint Annual Meeting: 5th (2003)

Wildlife observations collected over time at a US Air Force Base (AFB) have been visually displayed through Geographic Information System (GIS) technology. By continuing to expand upon the capabilities of GIS, USDA Wildlife Services has been able to manage the Seymour Johnson AFB airfield and surrounding areas in a practical manner. A Wildlife Hazard Assessment of the AFB used GIS to clearly display the location of birds and mammals observed on the airfield. Baseline themes of natural features (i.e. rivers, woodlands, etc.) were related to wildlife observations to determine areas requiring management. Additionally, GIS has been a useful tool to …

Phase Changes In Internally Mixed Maleic Acid/Ammonium Sulfate Aerosols, Sarah D. Brooks, Rebecca M. Garland, Matthew E. Wise, Anthony J. Prenni, Melinda Cushing, Erika Hewitt, Margaret A. Tolbert

CUP Faculty Research

A temperature controlled flow tube system equipped with Fourier transform infrared (FTIR) detection of particle phase and relative humidity was used to measure the deliquescence and efflorescence of ammonium sulfate, maleic acid, and internally mixed maleic acid/ammonium sulfate particles. Our results indicate that maleic acid aerosols begin to take up water starting at a low relative humidity, ∼20%, and continue the constant uptake of water until the final deliquescence relative humidity (DRH), 89%, is reached. Internally mixed particles containing maleic acid and ammonium sulfate were found to deliquesce at a lower relative humidity (RH) than either of the pure species. …

Design And Analysis For Melt Casting Metallic Fuel Pins Incorporating Volatile Actinides: Quarterly Progress Report 5/16/03- 8/15/03, Yitung Chen, Randy Clarksean, Darrell Pepper

Fuels Campaign (TRP)

The analysis of mold filling and solidification continues with progress being made for the consideration of these two features within one model. Analysis of the induction heating process of an Induction Skull Melter (ISM) is under study. Efforts are underway to validate the modeling procedure and specific comparisons are being made to previously published work. Few detailed modeling results have been reported by other researchers, making the validations an important part of the overall modeling process. Skin heating depths, power deposition rates, and other process parameters are being evaluated for use in upcoming furnace design simulations. Efforts are beginning on …

Development Of A Systems Engineering Model Of The Chemical Separations Process: Quarterly Progress Report 5/16/03- 8/15/03, Yitung Chen, Randy Clarksean, Darrell Pepper

Separations Campaign (TRP)

Two activities are proposed in this Phase I task: the development of a systems engineering model and the refinement of the Argonne code AMUSE (Argonne Model for Universal Solvent Extraction). The detailed systems engineering model is the start of an integrated approach to the analysis of the materials separations associated with the AAA Program. A second portion of the project is to streamline and improve an integral part of the overall systems model, which is the software package AMUSE. AMUSE analyzes the UREX process and other related solvent extraction processes and defines many of the process streams that are integral …

Development Of A Systems Engineering Model Of The Chemical Separations Process, Yitung Chen, Sean Hsieh, Randy Clarksean, Darrell Pepper

Separations Campaign (TRP)

The AFCI program is developing technology for the transmutation of nuclear waste to address many of the long-term disposal issues. An integral part of this program is the proposed chemical separations scheme.

Nearly all issues related to risks to future generations arising from long-term disposal of such spent nuclear fuel is attributable to about 2% of its content. Such 2% is made up primarily of plutonium, neptunium, americium, and curium (the transuranic elements) and long-lived isotopes of iodine and technetium created as products from the fission process in power reactors. When transuranics are removed from discharged fuel destined for disposal, …

First-Principles Calculations For Nitrogen-Containing Single-Walled Carbon Nanotubes, James P. Lewis, Mingwen Zhao, Yueyugan Xia, Ruiqin Zhang

Faculty Publications

We present calculations for possible configurations of nitrogen-containing single-walled carbon nanotubes and their electronic properties obtained with the ab initio tight-binding FIREBALL method. It is found that nitrogen atoms can be energetically incorporated into the carbon network in three forms: Substitution, substitution with formation of a vacancy structure, and chemical adsorption. The different forms exhibit different local densities of states near the Fermi levels, which might suggest a potential method to control the electronic properties of nitrogen-doped carbon nanotubes

Day 5. Friday, August 15, 2003: Rocky Mountain National Park, University Of Colorado Boulder. Natural Resources Law Center

Energy Field Tour 2003 (August 11-16)

1 page.

Contains references.

Memorandum Of Agreement Between The Federal Aviation Administration, The U.S. Air Force, The U.S. Army, The U.S. Environmental Protection Agency, The U.S. Fish And Wildlife Service, And The U.S. Department Of Agriculture To Address Aircraft-Wildlife Strikes

Other Bird Strike and Aviation Materials

The signatory agencies know the risks that aircraft-wildlife strikes pose to safe aviation.

This Memorandum of Agreement (MOA) acknowledges each signatory agency’s respective missions. Through this MOA, the agencies establish procedures necessary to coordinate their missions to more effectively address existing and future environmental conditions contributing to aircraft-wildlife strikes throughout the United States. These efforts are intended to minimize wildlife risks to aviation and human safety, while protecting the Nation’s valuable environmental resources.

Day 4. Thursday, August 14, 2003: Hayden Power Plant, University Of Colorado Boulder. Natural Resources Law Center

Energy Field Tour 2003 (August 11-16)

5 pages (includes color illustrations and maps).

Contains references.

Day 4. Thursday, August 14, 2003: Trapper Mine, University Of Colorado Boulder. Natural Resources Law Center

Energy Field Tour 2003 (August 11-16)

8 pages (includes some color illustrations).

Contains references.

Bear: An Open-Source Virtual Secure Coprocessor Based On Tcpa, Rich Macdonald, Sean Smith, John Marchesini, Omen Wild

Computer Science Technical Reports

This paper reports on our ongoing project to use TCPA to transform a desktop Linux machine into a virtual secure coprocessor: more powerful but less secure than higher-end devices. We use TCPA hardware and modified boot loaders to protect fairly static components, such as a trusted kernel; we use an enforcer module---configured as Linux Security Module---to protected more dynamic system components; we use an encrypted loopback filesystem to protect highly dynamic components. All our code is open source and available under GPL from http://enforcer.sourceforge.net/