619 Matching Results

Search Results

Results: 1 - 24 next
open access

[Development of a ballistic furnace for shell production]. Annual report 1998

Description: During the fourth contract year, the authors continued to develop Ballistic technology of shell formation. A new upgraded version of Ballistic Furnace with longer hot zone (1.56m) and cooling one (1.2m) had been finally assembled, and a lot of shell formation experiments had been carried out. The change of the Ballistic Furnace configuration has led to significant changing in operational conditions suitable for shells production. They had found optimal operational conditions for some grades of … more
Date: December 31, 1998
Creator: Cook, R. & Isakov, A. I.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

ADVANCED SULFUR CONTROL CONCEPTS FOR HOT GAS DESULFURIZATION TECHNOLOGY

Description: The objective of this project is to develop a hot-gas desulfurization process scheme for control of H{sub 2}S in HTHP coal gas that can be more simply and economically integrated with known regenerable sorbents in DOE/METC-sponsored work than current leading hot-gas desulfurization technologies. In addition to being more economical, the process scheme to be developed must yield an elemental sulfur byproduct.
Date: December 31, 1998
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Architectural design criteria for f-block metal ion sequestering agents. 1998 annual progress report

Description: 'The objective of this project is to provide a means to optimize ligand architecture for f-block metal recognition. The authors strategy builds on an innovative and successful molecular modeling approach in developing polyether ligand design criteria for the alkali and alkaline earth cations. The hypothesis underlying this proposal is that differences in metal ion binding with multidentate ligands bearing the same number and type of donor groups are primarily attributable to intramolecular ster… more
Date: December 31, 1998
Creator: Hay, Benjamin P.; Dixon, David A.; Roundhill, D. Max; Rogers, Robin D.; Paine, Robert T. & Raymond, Kenneth N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Laboratory Directed Research and Development Program. Annual Report to the Department of Energy, December 1998.

Description: In FY 1998, the BNL LDBD Program funded 20 projects, 4 of which were new starts, at a total cost of $2,563,681. The small number of new starts was a consequence of severe financial problems that developed between FY 1997 and 1998. Emphasis was given to complete funding for approved multi-year proposals. Following is a table which lists all of the FY 1998 funded projects and gives a history of funding for each by year. Several of these projects have already experienced varying degrees of success… more
Date: December 31, 1998
Creator: Ogeka, G. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Plane impact response of PBX 9501 below 2 GPA

Description: The plane impact response of PBX 9501 was measured below 2 GPa using a light-gas gun facility. Time-resolved wave profiles were obtained in a state of uniaxial strain for impact stresses between 0.3 to 1.2 GPa. The dynamic strength of PBX 9501 was measured at high strain rates in both compression and tension. The Hugoniot equation of state was measured.
Date: December 31, 1998
Creator: Dick, Jerry J.; Martinez, A. Richard & Hixson, Robert S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Modeling the Effects of Friction and Geometry on Deformation Path During Hot Rolling of Aluminum

Description: In this work, a parametric study of hot rolling is conducted. The effect of friction model, friction coefficient, roll gap geometry and temperature on the deformation rate field is demonstrated. This parameter space is restricted to a region which is tractable, yet provides considerable variety in the features of non-uniform deformation developed in rolling. The degree and nature of redundant work (shearing) is contrasted for different stream-line locations within the bite. Recommendations for … more
Date: December 31, 1998
Creator: Korzekwa, D. A. & Beaudoin, A. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Numerical simulation of explosive volcanism and its effects on the atmosphere

Description: This is the final report of a one-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The objective of this project was to begin work on combining two modeling approaches in order to advance the state-of-the-art in simulating and predicting explosive volcanic eruption dynamics and their effects. The authors began applying the CFDLIB family of codes for the near field (high temperature, velocity, and particle concentration) region of an… more
Date: December 31, 1998
Creator: Valentine, Greg A. & Bossert, James E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Thermodynamics and Sound Speeds at the Chapman-Jouguet State

Description: Some thermodynamic relations about an equilibrium Chapman-Jouguet (CJ) state are obtained. Relations for sound speeds in the wave velocity-particle velocity plane are derived. A relation between the slope of the sound speed in this plane and the asymptotic slope of the Hugoniot is suggested.
Date: December 31, 1998
Creator: Fritz, J. N. & Forest, C. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Data mining

Description: This is the final report of a one-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The objective of this project was to develop and implement data mining technology suited to the analysis of large collections of unstructured data. This has taken the form of a software tool, PADMA (Parallel Data Mining Agents), which incorporates parallel data accessing, parallel scalable hierarchical clustering algorithms, and a web-based user inter… more
Date: December 31, 1998
Creator: Lee, Kenneth; Kargupta, Hillol; Stafford, Brian G.; Buescher, Kevin L. & Ravindran, Binoy
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Routine Radiological Environmental Monitoring Plan, Volume 2 Appendices

Description: Supporting material for the plan includes: QUALITY ASSURANCE, ANALYSIS, AND SAMPLING PLAN FOR NTS AIR; QUALITY ASSURANCE, ANALYSIS, AND SAMPLING PLAN FOR WATER ON AND OFF THE NEVADA TEST SITE; QUALITY ASSURANCE, ANALYSIS, AND SAMPLING PLAN FOR NTS BIOTA; QUALITY ASSURANCE, ANALYSIS, AND SAMPLING PLAN FOR DIRECT RADIATION MONITORING; DATA QUALITY OBJECTIVES PROCESS; VADOSE ZONE MONITORING PLAN CHECKLIST.
Date: December 31, 1998
Creator: Nevada, Bechtel
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Fundamental and applied studies of helium ingrowth and aging in plutonium

Description: This is the final report of a two-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The purpose of this project was to develop new capabilities to assess the nucleation and growth of helium-associated defects in aged plutonium metal. This effort involved both fundamental and applied models to assist in predicting the transport and kinetics of helium in the metal lattice as well as ab initio calculations of the disposition of gallium … more
Date: December 31, 1998
Creator: Stevens, Michael F.; Zocco, Thomas; Albers, Robert; Becker, J. David; Walter, Kevin; Cort, Barbara et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Fuel-cycle energy and emissions impacts of tripled fuel economy vehicles

Description: This paper presents estimates of the full cycle energy and emissions impacts of light-duty vehicles with tripled fuel economy (3X vehicles) as currently being developed by the Partnership for a New Generation of Vehicles (PNGV). Seven engine and fuel combinations were analyzed: reformulated gasoline, methanol, and ethanol in spark-ignition, direct-injection engines; low sulfur diesel and dimethyl ether in compression-ignition, direct-injection engines; and hydrogen and methanol in fuel-cell veh… more
Date: December 31, 1998
Creator: Mintz, Marianne M.; Wang, Michael Q. & Vyas, Anant D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Corrections for the emission probabilities of the intense gamma rays from {sup 238}U and applying them to uranium isotopic analysis

Description: Gamma-ray emission probabilities of {sup 235}U and {sup 238}U have been studied extensively. While the gamma-ray emission probabilities for {sup 235}U and are well known, the emission probabilities for {sup 238}U differ widely from one study to another. This study indicates that one of the causes of the large discrepancies in the studies may be due to the true coincidence summing of many gamma rays from the decay of {sup 238}U daughters. The intensities of some of the intense gamma rays of {sup… more
Date: December 31, 1998
Creator: Vo, D. T.; Sampson, T. E. & Staples, P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Large area silicon drift detectors for x-rays -- New results

Description: Large area silicon drift detectors, consisting of 8 mm and 12 mm diameter hexagons, were fabricated on 0.35 mm thick high resistivity n-type silicon. An external FET and a low-noise charge sensitive preamplifier were used for testing the prototype detectors. The detector performance was measured in the range 75 to 25 C using Peltier cooling, and from 0.125 to 6 {micro}s amplifier shaping time. Measured energy resolutions were 159 eV FWHM and 263 eV FWHM for the 0.5 cm{sup 2} and 1 cm{sup 2} det… more
Date: December 31, 1998
Creator: Iwanczyk, J. S.; Patt, B. E.; Tull, C. R.; Segal, J. D.; Kenney, C. J.; Bradley, J. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Neutronic simulations for source-instrument matching at the Lujan Center

Description: The neutronics design of pulsed spallation neutron sources can be difficult when considering the fact that multiple instruments view the same moderator. Typically, the moderator design is a compromise between the required resolution for one instrument and the maximum intensity desires of another instrument. At the Manuel Lujan, Jr., Neutron Scattering Center (MLNSC), a recent target redesign has offered the opportunity to design a moderator for a Laue diffractometer with few other requirements.… more
Date: December 31, 1998
Creator: Court, J. D.; Ferguson, P. D. & Schoenborn, B. P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Ultrafine aerosol size distribution: A study of new particle formation in the atmosphere. Final report on DOE Grant number: DE-FG02-91ER61205

Description: This project involved studies pertinent to the formation of new particles by homogeneous nucleation in the atmosphere. The research focused on (1) the development of instrumentation to measure size distributions of freshly nucleated particles in the 3 to 10 nm diameter range, (2) laboratory studies of particle thermodynamic and transport properties relevant to nucleation in the atmosphere, and (3) field measurements of new particle formation by homogeneous nucleation. Highlights of the achievem… more
Date: December 31, 1998
Creator: McMurry, Peter H. & Eisele, Fred
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Nonlinear processes in earthquakes

Description: This is the final report of a one-year, Laboratory Directed Research and Development (LDRD) project at Los Alamos National Laboratory (LANL). Three-dimensional, elastic-wave-propagation calculations were performed to define the effects of near-source geologic structure on the degree to which seismic signals produced by earthquakes resemble {open_quotes}non-double-couple{close_quotes} sources. Signals from sources embedded in a subducting slab showed significant phase and amplitude differences c… more
Date: December 31, 1998
Creator: Jones, Eric M. & Frohlich, Clifford
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Modeling propagation effects from explosions in western China and India

Description: The authors report on the results of finite-difference simulations of regional seismic wave propagation from a 1995 explosion at the Chinese test site at Lop Nor and from the recent Indian test. These simulations provide insight into variations in explosion seismograms recorded for these events. Previous modeling efforts by App et al., 1996, and Jones et al., 1998, have shown that many features in seismograms from explosions and earthquakes received at various stations surrounding Lop Nor can b… more
Date: December 31, 1998
Creator: Bradley, Christopher R. & Jones, Eric M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

[Repair of a cable as it relates to the North Pacific Acoustic Laboratory]

Description: The ultimate limits of long-range sonar are imposed by ocean variability and the ambient sound field. Scattering from internal waves limits the temporal and spatial coherence of the received signal. Low frequency noise is dominated by shipping and ultimately, by wave-breaking processes. The resulting granularity of the noise field can be exploited for detection and localization purposes. The ultimate objective is to understand the fundamental limits to signal processing imposed by these ocean p… more
Date: December 31, 1998
Creator: Spindel, Robert C. & Worcester, Peter F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Reducing the risk to Mars: The gas core nuclear rocket

Description: The next giant leap for mankind will be the human exploration of Mars. Almost certainly within the next thirty years, a human crew will brave the isolation, the radiation, and the lack of gravity to walk on and explore the Red planet. However, because the mission distances and duration will be hundreds of times greater than the lunar missions, a human crew will face much greater obstacles and a higher risk than those experienced during the Apollo program. A single solution to many of these obst… more
Date: December 31, 1998
Creator: Howe, S.D.; DeVolder, B.; Thode, L. & Zerkle, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

High-resolution subsurface imaging and neural network recognition: Non-intrusive buried substance location. Final report, January 26, 1997

Description: A high-frequency, high-resolution electromagnetic (EIVI) imaging system has been developed for environmental geophysics surveys. Some key features of this system include: (1) rapid surveying to allow dense spatial sampling over a large area, (2) high-accuracy measurements which are used to produce a high-resolution image of the subsurface, (3) measurements which have excellent signal-to-noise ratio over a wide bandwidth (31 kHz to 32 MHZ), (4) elimination of electric-field interference at high … more
Date: December 31, 1998
Creator: Sternberg, B. K. & Poulton, M. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen