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Tank 241-BY-106 rotary core sampling and analysis plan

Description: This sampling and analysis plan will identify characterization objectives pertaining to sample collection, laboratory analytical evaluation, and reporting requirements for vapor samples and one rotary mode core sample from tank 241-BY-106.
Date: October 27, 1995
Creator: Bell, Kevin E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Fuel property effects on engine combustion processes. Final report

Description: A major obstacle to improving spark ignition engine efficiency is the limitations on compression ratio imposed by tendency of hydrocarbon fuels to knock (autoignite). A research program investigated the knock problem in spark ignition engines. Objective was to understand low and intermediate temperature chemistry of combustion processes relevant to autoignition and knock and to determine fuel property effects. Experiments were conducted in an optically and physically accessible research engine,… more
Date: April 27, 1995
Creator: Cernansky, N.P. & Miller, D.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Remote nuclear screening system for hostile environments

Description: A remote measurement system has been constructed for in situ gamma and beta isotopic characterization of highly radioactive nuclear material in hostile environments. A small collimated, planar CdZnTe detector is used for gamma-ray spectroscopy. Spectral resolution of 2% full width at half maximum at 662 kiloelectronvolts has been obtained remotely using rise time compensation and limited pulse shape discrimination, Isotopc measurement of high-energy beta emitters was accomplished with a ruggedi… more
Date: February 27, 1996
Creator: Addleman, R. S.; Beck, M. A.; Blewett, G. R.; Selle, E. R.; McClellan, C. S.; Dodd, D. A. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Active source requirements for assay of sludge drums on the BIR WIT system

Description: The design of the active source for active and passive computed tomography (A&PCT) is critical with respect to accuracy and throughput. The A&PCT active source requirements are highly dependent upon the attenuation properties of the waste matrix within the drum. On of the most highly attenuating waste matrices is sludge. This waste stream will consist of solidified aqueous waste consisting of IDC 001 first stage sludge and IDC 007 wet sludge. Also, the stream consists of solidified organic wast… more
Date: April 27, 1998
Creator: Roberson, G. P. & Camp, D. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Applications of electrochemically-modulated liquid chromatography (EMLC): Separations of aromatic amino acids and polycyclic aromatic hydrocarbons

Description: The research in this thesis explores the separation capabilities of a new technique termed electrochemically-modulated liquid chromatography (EMLC). The thesis begins with a general introduction section which provides a literature review of this technique as well as a brief background discussion of the two research projects in each of the next two chapters. The two papers which follow investigate the application of EMLC to the separation of a mixture of aromatic amino acids and of a mixture of … more
Date: March 27, 1998
Creator: Deng, L.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

Degradation kinetics of polymers in solution: Time-dependence of molecular weight distributions. [Quarterly report, January--March 1996]

Description: Polymer degradation occurs when polymer chains are broken under the influence of thermal, mechanical, or chemical energy. Chain-end depolymerization and random- and midpoint-chain scission are mechanisms that have been observed in liquid-phase polymer degradation. Here we develop mathematical models, unified by continuous-mixture kinetics, to show how these different mechanisms affect polymer degradation in solution. Rate expressions for the fragmentation of molecular-weight distributions (MWDs… more
Date: February 27, 1996
Creator: McCoy, B.J. & Madras, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Chemical synthesis, characterization and separation studies of functionalized polymeric supports. Final report

Description: Polymer resins with immobilized phosphorus acid ligands have been used to remove metal ions from solutions over wide pH range. These resins offer selective removal of metal ions under acidic conditions through coordination with the phosphoryl oxygen. Use of poly(vinylbenzyl chloride) foams as supports for phosphorus-based ligands is examined in this report. Foams with large pore volumes as supports offer an advantage over gel and macroporous beads in that the increased porosity could lead to in… more
Date: October 27, 1994
Creator: Alexandratos, S.D. & Beauvais, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Improved Evolutionary Hybrids for Flexible Ligand Docking in Autodock

Description: In this paper we evaluate the design of the hybrid evolutionary algorithms (EAs) that are currently used to perform flexible ligand binding in the Autodock docking software. Hybrid EAs incorporate specialized operators that exploit domain-specific features to accelerate an EA's search. We consider hybrid EAs that use an integrated local search operator to reline individuals within each iteration of the search. We evaluate several factors that impact the efficacy of a hybrid EA, and we propose n… more
Date: January 27, 1999
Creator: Belew, Richard K.; Hart, William E.; Morris, Garrett M. & Rosin, Chris
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Startup and Operation of a Metal Hydride Based Isotope Separation Process

Description: Production scale separation of tritium from other hydrogen isotopes at the Savannah River Site (SRS) in Aiken, SC, has been accomplished by several methods. These methods include thermal diffusion (1957--1986), fractional absorption (1964--1968), and cryogenic distillation (1967-present). Most recently, the Thermal Cycling Absorption Process (TCAP), a metal hydride based hydrogen isotope separation system, began production in the Replacement Tritium Facility (RTF) on April 9, 1994. TCAP has bee… more
Date: February 27, 1995
Creator: Scogin, J. H. & Poore, A. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Separable high explosive systems

Description: A number of approaches have been considered regarding the feasibility of separable high explosive systems for possible application in the Super Safe Program (Ambassador). After a very brief and limited investigation we have categorized various systems and given examples. The two basic approaches in the Ambassador program appear to be: Movement of fissionable material, and movement of explosives. Since explosives are our business, we will comment only on the latter approach. Movement of the expl… more
Date: October 27, 1971
Creator: Finger, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Full image spectral analysis of elemental emissions from an echelle spectrograph

Description: A new algorithm compares the background corrected echelle emission image obtained from reference standards to images of unknowns for quantitative elemental analyses. Wavelength was not used in the calculations but instead pixel position and intensity. The data reduction solution was unique to the particular detector/spectrometer. The approach was found useful for several types of images including ICP, DCP and glow discharge images. The analysis scheme required that the emission pattern of stand… more
Date: January 27, 2000
Creator: Spencer, W. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

In situ hydrothermal oxidative destruction of DNAPLS in a creosote contaminated site

Description: Hydrous Pyrolysis / Oxidation (HPO) is an in situ thermal remediation technology that uses hot, oxygenated groundwater to completely mineralize a wide range of organic pollutants. A field demonstration of HPO was performed at a creosote contaminated site during the summer of 1997. The groundwater was heated by steam injections and oxygen was added by coinjection of compressed air. The remediation was monitored from multiple groundwater monitoring wells. Dissolved organic carbon levels increased… more
Date: February 27, 1998
Creator: Leif, R. N., LLNL
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Synthesis, scale-up, and characterization of 2,6-diamino-3,5-dinitropyrazine-1-oxide (LLM-105)

Description: We have synthesized 4OOg of the new, insensitive, energetic heterocycle, 2,6-diamino-3,5-dinitropyrazine-l-oxide (LLM-105) with 81% the energy of HMX and excellent thermal stability. The synthesis is a three step reaction sequence from the commercially available starting material, 2,6-dichloropyrazine, with an overall yield of 36%. In this paper we will describe the scale-up of the synthesis of LLM- 105 and report on performance and shock sensitivity experiments performed on this material.
Date: April 27, 1998
Creator: Pagoria, P. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Progress report on the evaluation of porous cathode for the electrochemical reduction of nitrates and nitrites in liquid wastes

Description: This report describes the experimental and modeling work performed to evaluate porous cathodes for the electrochemical reduction of nitrites in liquid wastes. The experiments were done using the MP{dagger} cell with two different porous cathodes: nickel foam and TySAR{trademark}SB{double_dagger}. The experimental results are compared with each other and to those obtained with a planar nickel cathode. The results show that the ammonia production reaction is the dominant cathodic reaction ({appro… more
Date: December 27, 1995
Creator: Hobbs, D. T.; Jha, K.; Weidner, J. W. & White, R. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Enhancement of Equilibrium Shift in Dehydrogenation Reactions Using A Novel Membrane Reactor

Description: Electroless deposition of palladium thin-films on a surface of microporous ceramic substrate has been used to develop a new class of perm-selective inorganic membrane. In our previous two reports, we presented mathematical models to describe transport of hydrogen the palladium-ceramic composite membrane in single-stage permeation cell in cocurrent and countercurrent flow configurations. Analysis shows that the model equations have a singular point. In this report, a method is described how to a… more
Date: May 27, 1998
Creator: King, Franklin G. & Ilias, Shamsuddin
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Low sample volume part-per billion level ion chromatographic analysis

Description: ADS has developed an ion chromatographic method which enables low part-per-billion levels of analysis while minimizing liquid waste generation. This method incorporates several recent technical improvements in ion chromatographic instrumentation to achieve a ten- fold increase in sensitivity over existing ion chromatographic methods without additional analysis time or sample pre-concentration. This report outlines the method, establishes the precision and accuracy levels, and discusses the appl… more
Date: February 27, 1996
Creator: Ekechukwu, A.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The development of precipitated iron catalysts with improved stability; Final report, September 1987--September 1992

Description: Precipitated iron catalysts are expected to be used in next generation slurry reactors for large-scale production of transportation fuels from synthesis gas. These reactors are expected to operate at higher temperatures and lower H{sub 2}:CO ratios relative to the Sasol Arge reactor (Table 1A). The feasibility of using iron catalysts has been demonstrated under relatively mild Arge-type conditions but not under more severe slurry conditions. Possibly, an improvement in catalytic stability will … more
Date: December 27, 1993
Creator: Abrevaya, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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