Resource Type

Month

11 Matching Results

Results open in a new window/tab.

Life history and habitat associations of the broad wood cockroach, Parcoblatta lata (Blattaria: Blattellidae) and other native cockroaches in the Coastal Plain of South Carolina. (open access)

Life history and habitat associations of the broad wood cockroach, Parcoblatta lata (Blattaria: Blattellidae) and other native cockroaches in the Coastal Plain of South Carolina.

Wood cockroaches are an important prey of the red-cockaded woodpecker, Picoides borealis, an endangered species inhabiting pine forests in the southern United States. These woodpeckers forage on the boles of live pine trees, but their prey consists of a high proportion of wood cockroaches, Parcoblatta spp., that are more commonly associated with dead plant material. Cockroach population density samples were conducted on live pine trees, dead snags and coarse woody debris on the ground. The studies showed that snags and logs are also important habitats of wood cockroaches in pine forests.
Date: June 18, 2002
Creator: Horn, Scott & Hanula, James, L.
System: The UNT Digital Library
Preparing emergency response teams for effective risk communications. (open access)

Preparing emergency response teams for effective risk communications.

None
Date: June 18, 2002
Creator: Ingle, K.
System: The UNT Digital Library
U.S.A. visibility monitoring, trends, and regulatory programs and their relevance to Korea. (open access)

U.S.A. visibility monitoring, trends, and regulatory programs and their relevance to Korea.

This paper describes visibility monitoring and regulatory programs in the United States, particularly within certain designated National Parks and Wilderness Areas. Government agencies responsible for the management of federal lands, in cooperation with other federal, state, and regional air quality organizations, have established a monitoring program of more than 125 sites. Recent visual documentation (scene images), optical measurements, and aerosol characterizations (mass and chemical speciation) obtained at selected monitoring sites are presented, as information on general spatial and temporal visibility trends. National regulations are described that limit the amount of additional visibility impairment from new or modified emission sources and that establish a schedule for improving existing conditions in designated areas. The relevance of the experience in developing and implementing these programs to the planning for programs to address emerging visibility problems in Korea is discussed.
Date: June 18, 2002
Creator: Archer, S. F. & Chun, K. C.
System: The UNT Digital Library
RAPID MAPPING TOOL: AN ARCMAP EXTENSION (open access)

RAPID MAPPING TOOL: AN ARCMAP EXTENSION

Cartographic production laboratories produce large volumes of maps for diverse customers. Turnaround time and consistency are key concerns. The Rapid Mapping Tool is an ArcMap based tool that enables rapid creation of maps to meet customer needs. This tool was constructed using VB/VBA, ArcObjects, and ArcGIS templates. The core capability of ArcMap is extended for custom map production by storing specifications associated with a map or template in a companion XML document. These specifications include settings and preferences used to create custom maps. The tool was developed as a component of an enterprise GIS, which enables spatial data management and delivery using ArcSDE, ArcIMS, Oracle, and a web-based request tracking system.
Date: June 18, 2002
Creator: LINGER, STEVE P.; RICH, PAUL M.; WALTHER, DOUG; WITKOWSKI, MARC S.; JONES, MARCIA A. & KHALSA, HARI S.
System: The UNT Digital Library
Measurement of the Relative Intensity of the Ly-(alpha) Lines in Fe 25+ (open access)

Measurement of the Relative Intensity of the Ly-(alpha) Lines in Fe 25+

The intensity of the polarized Ly-{alpha}{sub 1} (2p{sub 3/2} {yields} 1s{sub 1/2}) transition has been measured relative to that of the unpolarized Ly-{alpha}{sub 2} (2p{sub 1/2} {yields} 1s{sub 1/2}) transition in Fe{sup 25+}. The measurements were made with the Livermore electron beam ion trap EBIT-II for beam energies from threshold to 2.5 times threshold. The results are compared to the corresponding intensity ratio predicted using excitation cross sections from distorted-wave calculations, which includes polarization, the M1(2s{sub 1/2} {yields} 1s{sub 1/2}) transition, and cascade contributions. Discrepancies are found that tend to confirm a recent report of a measurement of the Ly-{alpha} lines in Ti{sup 21+} performed on the Tokyo electron beam ion trap.
Date: June 18, 2002
Creator: Wong, K. L.; Beiersdorfer, P.; Reed, K. J. & Osterheld, A. L.
System: The UNT Digital Library
Laboratory Astrophysics at the LLNL Electron Beam Ion Traps EBIT I& EBIT II (open access)

Laboratory Astrophysics at the LLNL Electron Beam Ion Traps EBIT I& EBIT II

In order to provide a complete, accurate set of atomic data for interpreting spectra provided by missions such as XMM-Newton, the Chandra X-Ray Observatory, and Astro-E2, we have harnessed the Lawrence Livermore National Laboratory's electron beam ion traps EBIT-I, EBIT-II, and Super-EBIT for laboratory astrophysics. In support of this work we have developed a number of unique techniques, including the ability to experimentally simulate a Maxwellian distribution of electron energies and measuring low-energy charge exchange cross sections using the ''magnetic trapping mode''. We have also built, and operated a full suite of spectrometers spanning the 1-7000 {angstrom} wavelength band, the most recent, being the NASA/Goddard Space Flight Center's Astro-E 6 x 6 engineering spare microcalorimeter array. Results of our efforts include a complete list of wavelengths of the Fe L-shell transitions, measurements of absolute and relative cross sections for direct, impact, dielectronic, and resonance excitation, and measurements of low energy charge transfer reactions. A brief overview of the LLNL, ebit facility, its capabilities, and some results will be discussed.
Date: June 18, 2002
Creator: Beeriersdorder, P.; Chen, H.; May, M. J.; Thorn, D.; Brown, G. V.; Boyce, K. R. et al.
System: The UNT Digital Library
Emission Line Spectra in the Soft X-Ray Region 20-75 (Angstrom) (open access)

Emission Line Spectra in the Soft X-Ray Region 20-75 (Angstrom)

As part of a project to complete a comprehensive catalogue of astrophysically relevant emission lines in support of new-generation X-ray observatories using the Lawrence Livermore electron beam ion traps EBIT-I and EBIT-II, we studied emission lines of argon and sulfur in the soft X-ray and extreme ultraviolet region. Here we present observations of Ar IX through Ar XVI and S VII through S XIV between 20 and 75 {angstrom} to illustrate our work.
Date: June 18, 2002
Creator: Lepson, J K; Beiersdorfer, P; Chen, H; Behar, E & Kahn, S M
System: The UNT Digital Library
Control System for the LLNL Kicker Pulse Generator (open access)

Control System for the LLNL Kicker Pulse Generator

A solid-state high voltage pulse generator with multi-pulse burst capability, very fast rise and fall times, pulse width agility, and amplitude modulation capability for use with high speed electron beam kickers has been designed and tested at LLNL. A control system calculates a desired waveform to be applied to the kicker based on measured electron beam displacement then adjusts the pulse generators to provide the desired waveform. This paper presents the design of the control system and measure performance data from operation on the ETA-11 accelerator at LLNL.
Date: June 18, 2002
Creator: Watson, J A; Anaya, R M; Cook, E G; Lee, B S & Hawkins, S A
System: The UNT Digital Library
Laboratory Study of the Diagnostic Utility of the 3C/3D Line Ratio in Fe XVII (open access)

Laboratory Study of the Diagnostic Utility of the 3C/3D Line Ratio in Fe XVII

Fe XVII x-ray emission is present, in a multitude of sources, such as the corona of the Sun, Capella, and Procyon. Two of the strongest lines observed in these spectra are the resonance and intercombination lines located at 15.01 and 15.26 {angstrom}, respectively. As part, of the laboratory astrophysics program at the electron beam ion traps EBIT-I and EBIT-II located at the Lawrence Livermore National Laboratory we have measured this line ratio for the case where the relative abundance of Fe XVI to Fe XVII is {approx} 1. Our results show that an Fe XVI innershell satellite line coincides with the intercombination line and can significantly reduce the relative intensity, R, of the resonance to intercombination line. The fact that the apparent, relative intensity of the resonance and intercombination line in Fe XVII is sensitive to the strength of an Fe XVI innershell satellite, and therefore, the relative abundance of Fe XVI to Fe XVII, makes the line ratio a diagnostic of temperature, and explains the anomalously low ratios observed in the solar and stellar coronae.
Date: June 18, 2002
Creator: Beiersdorfer, P; Chen, H; Chen, M H; Reed, K J & Brown, G V
System: The UNT Digital Library
Magnets for a Muon Storage Ring. (open access)

Magnets for a Muon Storage Ring.

We present a new racetrack coil magnet design, with an open midplane gap, that keeps decay particles in a neutrino factory muon storage ring from directly hitting superconducting coils. The structure is very compact because coil ends overlap middle sections top and bottom for skew focusing optics. A large racetrack coil bend radius allows ''react and wind'' magnet technology to be used for brittle Nb{sub 3}Sn superconductors. We describe two versions: Design-A, a magnet presently under construction and Design-B, a further iterated concept that achieves the higher magnetic field quality specified in the neutrino factory feasibility Study-II report. For Design-B reverse polarity and identical end design of consecutive long and short coils offers theoretically perfect magnet end field error cancellation. These designs avoid the dead space penalty from coil ends and interconnect regions (a large fraction in machines with short length but large aperture magnets) and provide continuous bending or focusing without interruption. The coil support structure and cryostat are carefully optimized.
Date: June 18, 2002
Creator: Parker, B.; Anerella, M.; Ghosh, A.; Gupta, R.; Harrison, M.; Schmalzle, J. et al.
System: The UNT Digital Library
Assessment of health benefits from controlling air pollution in Shanghai, China. (open access)

Assessment of health benefits from controlling air pollution in Shanghai, China.

The large urban centers of the industrializing countries of the world are experiencing severe air quality problems as their demands for energy increase faster than their ability to afford strong environmental protection. This situation is particularly true in the fast-growing part of Asia, where coal often provides the fuel for power generation and industrial development and where the transportation sector grows unchecked. This paper describes the development of an integrated assessment of urban air quality and mitigation options for the city of Shanghai, China. First, a sector-specific, gridded inventory of emissions of SO{sub 2}, NO{sub x}, and particulate matter (PM) is developed. PM is divided into three size categories (TSP, PM{sub 10}, and PM{sub 2.5}) and split into carbonaceous and mineral classes. The URBAT model, a non-steady-state Lagrangian puff model, and related techniques are used to determine the spatial distribution of ambient concentrations of primary and secondary pollutant species. Damage functions are developed to determine the effects of these levels on human health in the greater Shanghai area. Two control scenarios are developed (for power generation and industry), and their effects on emissions of each species are estimated. The health benefits of the control measures are determined, and their relative …
Date: June 18, 2002
Creator: Chang, Y.-S.; Streets, D. G.; Tsao, C. L.; Li, J.; Guttikunda, S. & Carmichael, G. R.
System: The UNT Digital Library