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open access

Design and Implementation of a Facility for Discovering New Scintillator Materials

Description: We describe the design and operation of a high-throughput facility for synthesizing thousands of inorganic crystalline samples per year and evaluating them as potential scintillation detector materials. This facility includes a robotic dispenser, arrays of automated furnaces, a dual-beam X-ray generator for diffractometery and luminescence spectroscopy, a pulsed X-ray generator for time response measurements, computer-controlled sample changers, an optical spectrometer, and a network-accessible… more
Date: April 25, 2008
Creator: Derenzo, Stephen; Derenzo, Stephen E; Boswell, Martin S.; Bourret-Courchesne, Edith; Boutchko, Rostyslav; Budinger, Thomas F. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The fierce urgency of now: a proactive, pervasive content awareness tool

Description: Information awareness is distinct from explicit infonnation seeking, such as searching. We describe an information awareness tool that supports text composition by providing awareness of relevant content and references proactively and non-intrusively. As a user composes text, the tool automatically searches mUltiple sources, retrieves results, and displays links to the results. The tool has been implemented using Web 2.0 and Digital Library 2.0 technologies, and is flexible and highly configura… more
Date: January 1, 2009
Creator: Powell, James E; Collins, Linn M & Martinez, Mark L B
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Human Round Trip to Mars: Six Months and Radiation Safe

Description: Paper describing a proposal to send a crew on a round trip to Mars that will be relatively fast and safe from radiation dosage from cosmic rays and other sources. It includes background information, descriptions with figures, and discussion regarding a single trip or continuous trips to Mars.
Date: 1991
Creator: Lazareth, Otto W.; Schmidt, Eldon; Ludewig, Hans & Powell, James R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The Magnetic Road: A New Form of Transport

Description: A study is made of the technical and economic feasibility of a frictionless magnetic suspension generated by superconductors for transportation. Experiments relating to the suspension are described. A conceptual design is presented where vehicles suspended by magnetic interaction with two small insulated superconducting rails carry passengers and freight in vacuum tunnels at 600-1000 mph or in air at 200-300 mph. Other applications are possible, particularly for spacecraft and aircraft launchin… more
Date: 1962
Creator: Powell, James R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Personalizing situation awareness

Description: Emergency responders need access to information but what counts as actionable information depends on their role, task, location, and other variables. For example, experts who have unique knowledge and experience and are called on to serve as scientific and teclmical responders, require correspondingly unique situation awareness in order to do their work. In our research-in-progress we leverage emerging and evolving web and digital library technologies to create personalized situation awareness … more
Date: January 1, 2009
Creator: Collins, Linn Marks; Powell, James E; Roman, Jorge R; Martinez, Mark L B & Mane, Ketan K
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Production of [15O] Water at Low-Energy Proton Cyclotrons

Description: We report a simple system for producing [15O]H2O from nitrogen-15 in a nitrogen/hydrogen gas target with recycling of the target nitrogen, allowing production on low-energy proton-only accelerators with minimal consumption of isotopically enriched nitrogen-15. The radiolabeled water is separated from the target gas and radiolytically produced ammonia by temporary freezing in a small trap at -40 C.
Date: December 12, 2005
Creator: Powell, James & O'Neil, James P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Production of an Accelerated Oxygen-14 Beam

Description: BEARS is an ongoing project to provide a light-ion radioactive-beam capability at the 88-Inch Cyclotron at LBNL. Light radioactive isotopes are produced at a 10 MeV proton medical cyclotron, transported 350 m via a high-speed gas transport capillary, cryogenically separated, and injected into the 88-Inch Cyclotron's ion source. The first radioactive beam successfully accelerated was Carbon-11 and beams of intensity more than 108 ions/sec have been utilized for experiments. Development of Oxygen… more
Date: May 3, 2002
Creator: Powell, James; O'Neil, James P. & Cerny, Joseph
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Protocols for Authorized Release of Concrete

Description: Much of the clean or slightly contaminated concrete from Decontamination and Decommissioning (D&D) activities could be re-used. Currently, there is no standardized approach, or protocol, for managing the disposition of such materials. Namely, all potential disposition options for concrete, including authorized release for re-use, are generally not fully evaluated in D&D projects, so large quantities have been unduly disposed of as low-level radioactive waste. As a result, costs of D&D have beco… more
Date: June 1, 2000
Creator: Smith, Agatha Marie; Meservey, Richard Harlan; Chen, S. Y.; Powell, James Edward & Parker, F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Reducing Our Carbon Footprint through Ridesharing

Description: This report discusses research on reducing our carbon footprint through ridesharing. The focus of this research project was to analyze and collect travel trajectories to calculate carbon footprints under different travel modes and identify ways to reduce it.
Date: 2012
Creator: Garrett, Kim; Bell, Jesse; Huang, Yan & Powell, James
Item Type: Refine your search to only Report
Partner: UNT College of Engineering

Smart Routing of Memento Requests

Description: Presentation for the 2018 International Internet Preservation Consortium General Assembly and Web Archiving Conference. This presentation describes the use of machine learning models to route Memento requests.
Date: November 15, 2018
Creator: Klein, Martin; Balakireva, Lyudmila; Shankar, Harihar; Powell, James & Van de Sompel, Herbert
Item Type: Refine your search to only Presentation
Partner: International Internet Preservation Consortium
open access

Study of the 11C(p,gamma) reaction via the indirect d(11C,12N)ntransfer reaction

Description: The {sup 11}C(p,{gamma}){sup 12}N reaction is expected to be an important branch point in supermassive low-metallicity stars because it could produce CNO seed nuclei before the traditional triple-alpha process turns on. In the present work, the d({sup 11}C, {sup 12}N)n transfer reaction was employed to evaluate this reaction using a radioactive ion beam of 150 MeV {sup 11}C with 6 x 10{sup 5} ions/s on target from the BEARS project at the 88-inch cyclotron at Lawrence Berkeley National Laborato… more
Date: January 7, 2008
Creator: Lee, Dongwon; Powell, James; Perajarvi, Kari; Guo, Fanqing; Moltz, Dennis & Cerny, Joseph
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Using architectures for semantic interoperability to create journal clubs for emergency response

Description: In certain types of 'slow burn' emergencies, careful accumulation and evaluation of information can offer a crucial advantage. The SARS outbreak in the first decade of the 21st century was such an event, and ad hoc journal clubs played a critical role in assisting scientific and technical responders in identifying and developing various strategies for halting what could have become a dangerous pandemic. This research-in-progress paper describes a process for leveraging emerging semantic web and… more
Date: January 1, 2009
Creator: Powell, James E; Collins, Linn M & Martinez, Mark L B
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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