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A 2.14 ms candidate optical pulsar in SN1987A: Ten years after
We have monitored Supernova 1987A in optical/near-infrared bands from a few weeks following its birth until the present time in order to search for a pulsar remnant. We have found an apparent pattern of emission near the frequency of 467.5 Hz - a 2.14 ms pulsar candidate, first detected in data taken on the remnant at the Las Campanas Observatory (LCO) 2.5-m Dupont telescope during 14-16 Feb. 1992 UT. We detected further signals near the 2.14 ms period on numerous occasions over the next four years in data taken with a variety of telescopes, data systems and detectors, at a number of ground- and space-based observatories. The sequence of detections of this signal from Feb. `92 through August `93, prior to its apparent subsequent fading, is highly improbable (< 10{sup -10} for any noise source). We also find evidence for modulation of the 2.14 ms period with a {approx}1,000 s period which, when taken with the high spindown of the source (2-3 x 10{sup -10} Hz/s), is consistent with precession and spindown via gravitational radiation of a neutron star with a non- axisymmetric oblateness of {approx}10{sup -6}, and an implied gravitational luminosity exceeding that of the Crab Nebula pulsar by …
Date:
September 1, 1997
Creator:
Middleditch, J.; Kristian, J. A.; Kunkel, W. E.; Hill, K. M. & Watson, R. D.
Object Type:
Article
System:
The UNT Digital Library
100-D Ponds closure plan. Revision 1
The 100-D Ponds is a Treatment, Storage, and Disposal (TSD) unit on the Hanford Facility that received both dangerous and nonregulated waste. This Closure Plan (Rev. 1) for the 100-D Ponds TSD unit consists of a RCRA Part A Dangerous Waste Permit Application (Rev. 3), a RCRA Closure Plan, and supporting information contained in the appendices to the plan. The closure plan consists of eight chapters containing facility description, process information, waste characteristics, and groundwater monitoring data. There are also chapters containing the closure strategy and performance standards. The strategy for the closure of the 100-D Ponds TSD unit is clean closure. Appendices A and B of the closure plan demonstrate that soil and groundwater beneath 100-D Ponds are below cleanup limits. All dangerous wastes or dangerous waste constituents or residues associated with the operation of the ponds have been removed, therefore, human health and the environment are protected. Discharges to the 100-D Ponds, which are located in the 100-DR-1 operable unit, were discontinued in June 1994. Contaminated sediment was removed from the ponds in August 1996. Subsequent sampling and analysis demonstrated that there is no contamination remaining in the ponds, therefore, this closure plan is a demonstration of clean …
Date:
September 1, 1997
Creator:
Petersen, S.W.
Object Type:
Report
System:
The UNT Digital Library
A 600-kV double-pulser for the PHERMEX electron gun
The PHERMEX (Pulsed High Energy Radiographic Machine Emitting X-rays) Radiographic Facility is a 50-MHz, 3-Cavity, RF-Linac driven by a pulsed, thermionic electron-gun Injector. The PHERMEX is used to take flash radiographs using x-rays at a single time in an explosively driven event. To investigate the time evolution of these events requires two things: (1) a multiple-pulser to drive the electron-gun Injector and (2) a large-format, gamma-ray, camera system to record a scintillator at the different times. The authors report the recent success of developing a reliable double-pulser that consists of two Marx generators that independently charge two PFLs that are switched out at about 1.4 MV. The PFLs are connected in series by large diaphragm switches that are independently laser triggered by two quadrupled-YAG lasers. Recent tests of the system into a dummy load, produced two high quality 600 kV pulses separated by 1.0 {micro}s. Each pulse has a FWHM of 90 ns, a 50 ns flat-top {+-} 3%, and a risetime of 25 ns and a falltime of 35 ns. The interpulse time is variable up to about 275 {micro}s; the first switch is kept closed by a keep alive inductor. The system has produced a 50 shot sequence …
Date:
September 1, 1997
Creator:
Carlson, R. L.; Kang, M.; Melton, J. G.; Seitz, G. J. & Trujillo, L. T.
Object Type:
Article
System:
The UNT Digital Library
121st Annual Ponca Pow Wow
Photograph of the 121st Annual Ponca Pow Wow at White Eagle Park in Ponca City, OK. Photo by Mary Huffman, Sept. 1, 1997.
Date:
September 1, 1997
Creator:
Huffman, Mary
Object Type:
Photograph
System:
The Gateway to Oklahoma History
121st Annual Ponca Pow Wow
Photograph of the 121st Annual Ponca Pow Wow at White Eagle Park in Ponca City, OK. Photo by Mary Huffman, Sept. 1, 1997.
Date:
September 1, 1997
Creator:
Huffman, Mary
Object Type:
Photograph
System:
The Gateway to Oklahoma History
121st Annual Ponca Pow Wow
Photograph of the 121st Annual Ponca Pow Wow at White Eagle Park in Ponca City, OK. Photo by Mary Huffman, Sept. 1, 1997.
Date:
September 1, 1997
Creator:
Huffman, Mary
Object Type:
Photograph
System:
The Gateway to Oklahoma History
121st Annual Ponca Pow Wow
Photograph of the 121st Annual Ponca Pow Wow at White Eagle Park in Ponca City, OK. Photo by Mary Huffman, Sept. 1, 1997.
Date:
September 1, 1997
Creator:
Huffman, Mary
Object Type:
Photograph
System:
The Gateway to Oklahoma History
121st Annual Ponca Pow Wow
Photograph of the 121st Annual Ponca Pow Wow at White Eagle Park in Ponca City, OK. Photo by Mary Huffman, Sept. 1, 1997.
Date:
September 1, 1997
Creator:
Huffman, Mary
Object Type:
Photograph
System:
The Gateway to Oklahoma History
121st Annual Ponca Pow Wow
Photograph of the 121st Annual Ponca Pow Wow at White Eagle Park in Ponca City, OK. Photo by Mary Huffman, Sept. 1, 1997.
Date:
September 1, 1997
Creator:
Huffman, Mary
Object Type:
Photograph
System:
The Gateway to Oklahoma History
121st Annual Ponca Pow Wow
Photograph of the 121st Annual Ponca Pow Wow at White Eagle Park in Ponca City, OK. Photo by Mary Huffman, Sept. 1, 1997.
Date:
September 1, 1997
Creator:
Huffman, Mary
Object Type:
Photograph
System:
The Gateway to Oklahoma History
121st Annual Ponca Pow Wow
Photograph of the 121st Annual Ponca Pow Wow at White Eagle Park in Ponca City, OK. Photo by Mary Huffman, Sept. 1, 1997.
Date:
September 1, 1997
Creator:
Huffman, Mary
Object Type:
Photograph
System:
The Gateway to Oklahoma History
121st Annual Ponca Pow Wow
Photograph of the 121st Annual Ponca Pow Wow at White Eagle Park in Ponca City, OK. Photo by Mary Huffman, Sept. 1, 1997.
Date:
September 1, 1997
Creator:
Huffman, Mary
Object Type:
Photograph
System:
The Gateway to Oklahoma History
121st Annual Ponca Pow Wow
Photograph of the 121st Annual Ponca Pow Wow at White Eagle Park in Ponca City, OK. Photo by Mary Huffman, Sept. 1, 1997.
Date:
September 1, 1997
Creator:
Huffman, Mary
Object Type:
Photograph
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 27, No. 2, Ed. 1 Friday, September 12, 1997
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
September 12, 1997
Creator:
Easttom, Holly
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 27, No. 3, Ed. 1 Friday, September 19, 1997
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
September 19, 1997
Creator:
Easttom, Holly
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 27, No. 4, Ed. 1 Friday, September 26, 1997
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
September 26, 1997
Creator:
Easttom, Holly
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
1996 LMITCO environmental monitoring program report for the Idaho National Engineering and Environmental Laboratory
This report describes the calendar year 1996 environmental surveillance and compliance monitoring activities of the Lockheed Martin Idaho Technologies Company Environmental Monitoring Program performed at the Idaho National Engineering and Environmental Laboratory (INEEL). Results of sampling performed by the Radiological Environmental Surveillance, Site Environmental Surveillance, Drinking Water, Effluent Monitoring, Storm Water Monitoring, Groundwater Monitoring, and Special Request Monitoring Programs are included in this report. The primary purposes of the surveillance and monitoring activities are to evaluate environmental conditions, to provide and interpret data, to verify compliance with applicable regulations or standards, and to ensure protection of human health and the environment. This report compares 1996 data with program-specific regulatory guidelines and past data to evaluate trends.
Date:
September 1, 1997
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
1996 Site environmental report. Volume I
This report summarizes environmental activities at the Ernest Orlando Lawrence Berkeley National Laboratory (Berkeley Lab) for 1996. It presents data and information that characterize the Laboratory`s environmental management performance measured against applicable regulatory standards and DOE requirements. The report also discusses significant highlights of Berkeley Lab`s environmental programs. The format and content of the report satisfy the requirements set forth in applicable sections of U.S. Department of Energy (DOE) Order 231.1, Environment, Safety and Health Reporting, and included in the contract between the University of California (UC) and The DOE.
Date:
September 1, 1997
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
1996 Site environmental report. Volume II
Ernest Orlando Lawrence Berkeley National Laboratory presents Volume II, data appendix as a reference document to supplement the 1996 Site Environmental Report. Volume II contains the raw environmental monitoring and sampling data used to generate many of the summary results included in the main report for both routine and nonroutine activities. This appendix includes a legend that cross-references the enclosed data tables with summary tables in the main report. The legend also provides a listing of more detailed descriptions for the station location codes used in the appendices` tables. Data presented in the tables are given in Systeme International (SI) units. The glossary found in the main report contains a listing of the SI units.
Date:
September 1, 1997
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
1996 state-by-state assessment of low-level radioactive wastes received at commercial disposal sites
Each year the National Low-Level Waste Management Program publishes a state-by-state assessment report. This report provides both national and state-specific disposal data on low-level radioactive waste commercially disposed in the US. Data in this report are categorized according to disposal site, generator category, waste class, volumes, and radionuclide activity. Included in this report are tables showing the distribution of waste by state for 1996 and a comparison of waste volumes and radioactivity by state for 1992 through 1996; also included is a list of all commercial nuclear power reactors in the US as of December 31, 1996. This report distinguishes between low-level radioactive waste shipped directly for disposal by generators and waste that was handled by an intermediary, a reporting change introduced in the 1988 state-by-state report.
Date:
September 1997
Creator:
Fuchs, R. L.
Object Type:
Report
System:
The UNT Digital Library
1997 Gordon Research Conference on Molecular Electronic Spectroscopy. Final Progress Report
None
Date:
September 5, 1997
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
1997 structural integrity assessments for the Category C liquid low-level waste tank systems at Oak Ridge National Laboratory, Oak Ridge, Tennessee
This report presents the results of a series of evaluations to determine if the individual Category C tank systems retain sufficient structural integrity to continue being used for liquid storage. The approach used to reach the final certification/conclusion consisted of three phases, including: (1) Review of the original engineering design drawings and construction materials to determine whether the tank and line systems were capable of containing liquids without leaking (and also to check that the construction materials were compatible with liquids that might have been placed in these systems). While drawings in this report may be of poor quality, they are copies of the best available originals. (2) A qualitative corrosion assessment conducted in 1995 that further evaluated both the potential internal corrosion effects of materials in the tank and in the potential external corrosion effects of the backfill and native soil at the Oak Ridge National Laboratory (ORNL). The ability to accurately measure or predict the amount of corrosion present on both the internal and external walls of the tanks and pipelines is extremely limited. However, when available, data were used to assess the historical tank contents and usage and the probable corrosive effects on the tank system materials …
Date:
September 1, 1997
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
1997 U.S. Department of Energy Strategic Plan
With the end of the Cold War and the election of President Clinton, the Department of Energy (DOE) set a new course which began with the publication of its first departmental strategic plan in April 1994. Entitled ``Fueling a Competitive Economy, it provided the framework and shared vision for meeting responsibilities in energy, national security, environmental quality, and science and technology. The strategic plan was the guidepost for the formulation of the Department`s FY 1996, FY 1997, and FY 1998 budgets and was critical to the development of the Department`s Strategic Alignment Initiative, designed to save $1.7 billion over five years. This current plan, which has been significantly improved through a very close consultation process with Congress and customers stakeholders, takes DOE to the next important performance level by being more directly linked to actions and results. It defines a strategic goal for each of the Department`s four business lines and, in the spirit of the Government Performance and Results Act and the National Performance Review, identifies a fifth goal addressing corporate management. Reengineering the business practices, managing for results, being open with neighbors and stakeholders, and ensuring the safety and health of DOE workers and the public are, and …
Date:
September 1997
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
3D Atlas vertical plate oil transmission line field calculations. Final report
Because of questions regarding current density and inductance estimates of the Atlas oil transmission line in the region where the vertical plates connect to the disk line, calculations using the 3D FE program Flux3d were initiated. Flux3d inductance values are nearly that estimated by D. Scudder. Calculations for three base designs of E. Ballard and D. Pierce were completed where several variations for each base design were used to determine the important parameters affecting inductance and to check inductance consistency. Flux3d showed for the first base design a very high current density of 36MA/m at the connection between the vertical and horizontal ground plates resulting in a magnetic pressure of 120 kpsi. The second base design modified this connection to reduce the current density to 20MA/m and 36 kpsi and for design 3 current density is 17MA/m. Maximum current density on the hot plates is 20MA/m for all 3 designs. These values assumed 1.2MA per VTL or 45.6MA total system current. Electrical fields on the top of the hot plate near the disk line connection is about 50% greater than the nominal value near the center of the vertical plates.
Date:
September 18, 1997
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library