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Post natural phenomena event priorities for structural investigations in the tank farms

Description: The purpose of this task is to prioritize the tanks and tank farms having the greatest potential for structural damage following a significant natural phenomena. An event of sufficient magnitude could cause widespread structural damage throughout the tank farms. The damage caused by a seismic event may not be observable because many components such as transfer lines, tanks, or process pits are underground. Or, components over the waste tanks may be involved, with damage to ventilation system ho… more
Date: May 1, 1997
Creator: Lindberg, S. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Study of benzene release from Savannah River in-tank precipitation process slurry simulant

Description: At the Savannah River Site, the in-tank precipitation (ITP) process uses sodium tetraphenylborate (NaTPB) to precipitate radioactive cesium from alkaline wastes. During this process, potassium is also precipitated to form 4-wt% KTPB/CsTPB slurry. Residual NaTPB decomposes to form benzene, which is retained by the waste slurry. The retained benzene is also readily released from the waste during subsequent waste processing. While the release of benzene certainly poses flammability and toxicologic… more
Date: August 1, 1998
Creator: Rappe, K. G. & Gauglitz, P. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

An overview of reliability assessment and control for design of civil engineering structures

Description: Random variations, whether they occur in the input signal or the system parameters, are phenomena that occur in nearly all engineering systems of interest. As a result, nondeterministic modeling techniques must somehow account for these variations to ensure validity of the solution. As might be expected, this is a difficult proposition and the focus of many current research efforts. Controlling seismically excited structures is one pertinent application of nondeterministic analysis and is the s… more
Date: June 1, 1998
Creator: Field, Richard V., Jr.; Grigoriadis, Karolos M.; Bergman, Lawrence A. & Skelton, Robert E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Context sensitivity and ambiguity in component-based systems design

Description: Designers of components-based, real-time systems need to guarantee to correctness of soft-ware and its output. Complexity of a system, and thus the propensity for error, is best characterized by the number of states a component can encounter. In many cases, large numbers of states arise where the processing is highly dependent on context. In these cases, states are often missed, leading to errors. The following are proposals for compactly specifying system states which allow the factoring of co… more
Date: October 1, 1997
Creator: Bespalko, Stephen J. & Sindt, Alexander
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Uncooled Thin Film Infrared Imaging Device With Aerogel Thermal Isolation: Deposition and Planarization Techniques

Description: The authors have successfully integrated a thermally insulating silica aerogel thin film into a new uncooled monolithic thin film infrared (IR) imaging device. Compared to other technologies (bulk ceramic and microbridge), use of an aerogel layer provides superior thermal isolation of the pyroelectric imaging element from the relatively massive heat sinking integrated circuit. This results in significantly higher thermal and temporal resolutions. They have calculated noise equivalent temperatur… more
Date: April 1, 1998
Creator: Ruffner, J. A.; Clem, P. G.; Tuttle, B. A.; Brinker, C. J.; Sriram, C. S. & Bullington, J. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A Road Map for Implementing Systems Engineering

Description: Studies by academia, industry, and government indicate that applying a sound systems engineering process to development programs is an important tool for preventing cost and schedule overruns and performance deficiencies. There is an enormous body of systems engineering knowledge. Where does one start? How can the principles of systems engineering be applied in the Sandia environment? This road map is intended to be an aid to answering these questions.
Date: February 1, 1997
Creator: Dean, F. F.; Bentz, B. & Bahill, A. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Requirements Discovery Process

Description: Cost and schedule overruns are often caused by poor requirements that are produced by people who do not understand the requirement process. This paper provides a high-level overview of the requirements discovery process.
Date: February 1, 1997
Creator: Bahill, A. T. & Dean, F. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Evaluation of transboundary environmental issues in Central Europe

Description: Central Europe has experienced environmental degradation for hundreds of years. The proximity of countries, their shared resources, and transboundary movement of environmental pollution, create the potential for regional environmental strife. The goal of this project was to identify the sources and sinks of environmental pollution in Central Europe and evaluate the possible impact of transboundary movement of pollution on the countries of Central Europe. In meeting the objectives of identifying… more
Date: May 1, 1997
Creator: Engi, Dennis; Kapustka, Lawrence A.; Williams, Bill A.; Meganck, Richard A.; Glicken, Jessica; Garrison, Joseph G. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of constraint methodologies applied to a shallow-flaw cruciform bend specimen tested under biaxial loading conditions

Description: A technology to determine shallow-flaw fracture toughness of reactor pressure vessel (RPV) steels is being developed for application to the safety assessment of RPVs containing postulated shallow surface flaws. Matrices of cruciform beam tests were developed to investigate and quantify the effects of temperature, biaxial loading, and specimen size on fracture initiation toughness of two-dimensional (constant depth), shallow surface flaws. The cruciform beam specimens were developed at Oak Ridge… more
Date: January 1, 1998
Creator: Bass, B. R.; McAfee, W. J.; Williams, P. T. & Pennell, W. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Electrochemical characteristics of lithium-ion cells

Description: The authors describe below the electrochemical performance characteristics, including charge-discharge characteristics at different rates, of cylindrical 18650 (18 mm diameter, 65 mm high) and prismatic lithium ion cells at ambient and sub-ambient temperatures. Ragone plots of power and energy data for these cells are compared and indicate that at room temperature the prismatic lithium ion cells (approx. 500 mAh) exhibit higher specific power and power density than the 18650 cells (approx. 1,10… more
Date: January 1, 1998
Creator: Nagasubramanian, G.; Roth, P.; Jungst, R. G. & Clark, N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Environmental fate and transport of chemical signatures from buried landmines -- Screening model formulation and initial simulations

Description: The fate and transport of chemical signature molecules that emanate from buried landmines is strongly influenced by physical chemical properties and by environmental conditions of the specific chemical compounds. Published data have been evaluated as the input parameters that are used in the simulation of the fate and transport processes. A one-dimensional model developed for screening agricultural pesticides was modified and used to simulate the appearance of a surface flux above a buried land… more
Date: June 1, 1997
Creator: Phelan, James M. & Webb, Stephen W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Growth of Mid-Infrared Emitting InAsSb/InAsP Strained-Layer Superlattices Using Metal-Organic Chemical Vapor Deposition

Description: We describe the metal-organic chemical vapor deposition os InAsSb/InAsP strained-layer superlattice (SLS) active regions for use in mid-infrared emitters. These SLSs were grown at 500 {degrees}C, and 200 torr in a horizontal quartz reactor using trimethylindium, triethylantimony, AsH{sub 3}, and PH{sub 3}. By changing the layer thickness and composition we have prepared structures with low temperature ({le}20K) photoluminescence wavelengths ranging from 3.2 to 5.0 {mu}m. Excellent performance w… more
Date: October 1, 1997
Creator: Biefeld, R. M.; Allerman, A. A.; Kurtz, S. R. & Burkhart, J. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Apparent spatial blurring and displacement of a point optical source due to cloud scattering

Description: A Monte Carlo algorithm is used to determine the apparent spatial blurring of a terrestrial 1.07 micron optical point source due to cloud scattering as seen from space. The virtual image of a point source over a virtual source plane area 22.4 x 22.4 square kilometers arising from cloud scattering was determined for stratus clouds (NASA cloud number 5) and altostratus clouds optical source arises from photon scattering by cloud water droplets. Displacement of the virtual source is due to the app… more
Date: September 1, 1997
Creator: Brower, K.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Polyplanar optic display for cockpit application

Description: The Polyplanar Optical Display (POD) is a high contrast display screen being developed for cockpit applications. This display screen is 2 inches thick and has a matte black face which allows for high contrast images. The prototype being developed is a form, fit and functional replacement display for the B-52 aircraft which uses a monochrome ten-inch display. The new display uses a long lifetime, (10,000 hour), 200 mW green solid-state laser (532 nm) as its optical source. In order to produce re… more
Date: April 1, 1998
Creator: Veligdan, J.; Biscardi, C.; Brewster, C.; DeSanto, L. & Freibott, W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Multi-material processing by LENS{trademark}

Description: During the past few years, solid freeform fabrication has evolved into direct fabrication of metallic components using computer aided design (CAD) solid models. Laser Engineered Net Shaping (LENS{trademark}) is one such technique being developed at Sandia to fabricate high strength, near net shape metallic components. In the past two years a variety of components have been fabricated using LENS{trademark} for applications ranging from prototype parts to injection mold tooling. To advance direct… more
Date: October 1, 1997
Creator: Griffith, M. L.; Harwell, L. D.; Romero, J. T.; Schlienger, E.; Atwood, C. L. & Smugeresky, J. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Resource conservation and pollution prevention through process optimization at Sandia National Laboratories` Steam Plant

Description: The Steam Plant at Sandia National Laboratories/New Mexico (SNL/NM) supplies on average 680,000 kg/day (1.5 x 10{sup 6} lb/day) of saturated steam for space heating and laboratory processes for SNL/NM, Technical Area 1, the eastern portion of Kirtland Air Force Base, the Department of Energy`s Albuquerque Office, and the KAFB Coronado Club. The primary fuel is natural gas (740 mscf/yr); the secondary fuel in the event of a natural gas interruption is diesel fuel. Two storage tanks provide a die… more
Date: October 1, 1997
Creator: Evans, C. & Chavez, C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Growing a market economy

Description: This report presents a microsimulation model of a transition economy. Transition is defined as the process of moving from a state-enterprise economy to a market economy. The emphasis is on growing a market economy starting from basic microprinciples. The model described in this report extends and modifies the capabilities of Aspen, a new agent-based model that is being developed at Sandia National Laboratories on a massively parallel Paragon computer. Aspen is significantly different from tradi… more
Date: September 1, 1997
Creator: Basu, N. & Pryor, R.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Micromechanical modeling of heterogeneous energetic materials

Description: In this work, the mesoscale processes of consolidation, deformation and reaction of shocked porous energetic materials are studied using shock physics analysis of impact on a collection of discrete HMX crystals. High resolution three-dimensional CTH simulations indicate that rapid deformation occurs at material contact points causing large amplitude fluctuations of stress states having wavelengths of the order of several particle diameters. Localization of energy produces hot-spots due to shock… more
Date: September 1, 1998
Creator: Baer, M. R.; Kipp, M. E. & van Swol, F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

ICP dry etching of III-V nitrides

Description: Inductively coupled plasma etching of GaN, AlN, InN, InGaN and InAlN was investigated in CH{sub 4}/H{sub 2}/Ar plasmas as a function of dc bias, and ICP power. The etch rates were generally quite low, as is common for III-nitrides in CH{sub 4} based chemistries. The etch rates increased with increasing dc bias. At low rf power (150 W), the etch rates increased with increasing ICP power, while at 350 W rf power, a peak was found between 500 and 750 W ICP power. The etched surfaces were found to … more
Date: October 1, 1997
Creator: Vartuli, C. B.; Lee, J. W. & MacKenzie, J. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

1996 Site environmental report Sandia National Laboratories Albuquerque, New Mexico

Description: Sandia National Laboratories/New Mexico (SNL/NM) is operated in support of the U.S. Department of Energy (DOE) mission to provide weapon component technology and hardware for national security needs, and to conduct fundamental research and development (R&D) to advance technology in energy research, computer science, waste management, electronics, materials science, and transportation safety for hazardous and nuclear components. In support of this mission, the Environmental Safety and Health (ES… more
Date: August 1, 1997
Creator: Fink, C.H.; Duncan, D. & Sanchez, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Thermodynamic modeling of natural zeolite stability

Description: Zeolites occur in a variety of geologic environments and are used in numerous agricultural, commercial, and environmental applications. It is desirable to understand their stability both to predict future stability and to evaluate the geochemical conditions resulting in their formation. The use of estimated thermodynamic data for measured zeolite compositions allows thermodynamic modeling of stability relationships among zeolites in different geologic environments (diagenetic, saline and alkali… more
Date: June 1, 1997
Creator: Chipera, S. J. & Bish, D. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Advanced materials for aerospace and biomedical applications: New glasses for hermetic titanium seals

Description: Titanium and titanium alloys have an outstanding strength-to-weight ratio and corrosion resistance and so are materials of choice for a variety of aerospace and biomedical applications. Such applications are limited by the lack of a viable hermetic glass sealing technology. Conventional silicate sealing glasses are readily reduced by titanium to form interfacial silicides that are incompatible with a robust glass/metal seal. Borate-based glasses undergo a similar thermochemistry and are reduced… more
Date: November 1, 1996
Creator: Brow, R.K.; Tallant, D.R. & Crowder, S. V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Optimization of the polyplanar optical display electronics for a monochrome B-52 display

Description: The Polyplanar Optical Display (POD) is a unique display screen which can be used with any projection source. The prototype ten-inch display is two inches thick and has a matte black face which allows for high contrast images. The prototype being developed is a form, fit and functional replacement display for the B-52 aircraft which uses a monochrome ten-inch display. In order to achieve a long lifetime, the new display uses a new 200 mW green solid-state laser (10,000 hr. life) at 532 nm as it… more
Date: April 1, 1998
Creator: DeSanto, L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Plutonium Finishing Plant (PFP) Standards/Requirements Identification Document (S/RID)

Description: This Standards/Requirements Identification Document (S/RID) sets forth the Environmental Safety and Health (ESH) standards/requirements for the Plutonium Finishing Plant (PFP). This S/RID is applicable to the appropriate life cycle phases of design, construction, operation, and preparation for decommissioning. These standards/requirements are adequate to ensure the protection of the health and safety of workers, the public, and the environment.
Date: January 1, 1996
Creator: Maddox, B. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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