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INTEGRATED HYDROGEN STORAGE SYSTEM MODEL

Description: Hydrogen storage is recognized as a key technical hurdle that must be overcome for the realization of hydrogen powered vehicles. Metal hydrides and their doped variants have shown great promise as a storage material and significant advances have been made with this technology. In any practical storage system the rate of H2 uptake will be governed by all processes that affect the rate of mass transport through the bed and into the particles. These coupled processes include heat and mass transfer… more
Date: November 16, 2007
Creator: Hardy, B
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Environmental impact of a teratogenic actinide: a case study of americium-241

Description: Americium-241 is widely used as a radiation source, but it also has some potential risk if taken into the body. Although the radiotoxicity of americium-241 is small compared to other transuranic actinides, its effects on the reproductive system and on development of the placenta are more damaging than the effects of plutonium-239. A previous report based on a worst-case scenario involving a hypothetical fire accident in a contaminated facility indicated that there could have been a significant … more
Date: October 16, 1985
Creator: Wang, J. & Yang, J.Y.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Hot gas cleanup for molten carbonate fuel cells. A zinc oxide reactor model, Final report

Description: Utilization of coal gasifiers to power MCFC requires a cleanup system to remove sulfur and particulates. Of the two near term options available for desulfurization of gasifier effluent, namely low temperature cleanup utilizing absorber/stripper technology, and hot gas cleanup utilizing metal oxides, there is a clear advantage to using hot gas cleanup. Since the MCFC will operate at 1200/sup 0/F, and the gasifier effluent could be between 1200 to 1900/sup 0/F, a hot gas cleanup system will requi… more
Date: September 16, 1980
Creator: Steinfeld, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Review of monitoring instruments for transuranics in fuel fabrication and reprocessing plants. A progress report to the physical and technological programs, Division of Biomedical and Environmental Research, U. S. Energy Research and Development Administration

Description: A comprehensive review of the monitoring instruments for transuranic elements released from nuclear fuel fabrication and reprocessing plants has been compiled. The extent of routine operational releases has been reviewed for the light water reactor (LWR) fuel cycle (including plutonium recycle), the breeder reactor fuel cycle, and the high-temperature gas cooled reactor (HTGR) fuel cycle. The stack monitoring instrumentation presently in use at the various fabrication and reprocessing plants ar… more
Date: November 16, 1976
Creator: Kordas, J. F. & Phelps, P. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The winds of cataclysmic variables

Description: The authors present an observational and theoretical review of the winds of cataclysmic variables (CVs). Specifically, they consider the related problems of the geometry and mass-loss rate of the winds of CVs, their ionization state and variability, and the results from studies of eclipsing CVs. Finally, they consider the properties of accretion disk wind models. Some of these models predict substantial angular momentum loss, which could affect both disk structure and binary evolution.
Date: February 16, 1994
Creator: Mauche, C. W. & Raymond, J. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Reactive Blast Waves from Composite Charges

Description: Investigated here is the performance of composite explosives - measured in terms of the blast wave they drive into the surrounding environment. The composite charge configuration studied here was a spherical booster (1/3 charge mass), surrounded by aluminum (Al) powder (2/3 charge mass) at an initial density of {rho}{sub 0} = 0.604 g/cc. The Al powder acts as a fuel but does not detonate - thereby providing an extreme example of a 'non-ideal' explosive (where 2/3 of the charge does not detonate… more
Date: October 16, 2009
Creator: Kuhl, A L; Bell, J B & Beckner, V E
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Heat and Mass Transfer in Models of Undeveloped Geothermal Fields

Description: A brief summary is given of the nondimensional equations and relevant parameters to be used for describing convection processes in the geothermal setting. Characteristic estimates of flow rates and pressure variation (beyond the hydrostatic value) are given. it is shown that the complete equation system can be reduced in complexity by neglecting terms which describe physically insignificant effects. The resulting equations are used to consider the onset of convection in a horizontal saturated p… more
Date: June 16, 1975
Creator: Kassoy, D. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

DNAPL Surface Chemistry: Its Impact on DNAPL Distribution in the Vadose Zone and its Manipulation to Enhance Remediation

Description: The remediation of DNAPLs in subsurface environments is often limited by the heterogeneous distribution of the organic fluid. The fraction of DNAPL that is in the high conductivity regions of the subsurface can often be recovered relatively easily, although DNAPL in lower conductivity regions is much more difficult to extract, either through direct pumping or remediation measures based on interface mass transfer. The distribution of DNAPL within the vadose zone is affected by a complex interpla… more
Date: June 16, 2003
Creator: Power, Suan; Grimberg, Stefan & Denham, Miles
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

DOE LLW classification rationale

Description: This report was about the rationale which the US Department of Energy had with low-level radioactive waste (LLW) classification. It is based on the Nuclear Regulatory Commission's classification system. DOE site operators met to review the qualifications and characteristics of the classification systems. They evaluated performance objectives, developed waste classification tables, and compiled dose limits on the waste. A goal of the LLW classification system was to allow each disposal site the … more
Date: September 16, 1991
Creator: Flores, A. Y.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Calculation of Post-Closure Natural Convection Heat and Mass Transfer in Yucca Mountain Drifts

Description: Natural convection heat and mass transfer under post-closure conditions has been calculated for Yucca Mountain drifts using the computational fluid dynamics (CFD) code FLUENT. Calculations have been performed for 300, 1000, 3000, and 10,000 years after repository closure. Effective dispersion coefficients that can be used to calculate mass transfer in the drift have been evaluated as a function of time and boundary temperature tilt.
Date: March 16, 2004
Creator: Webb, S. & Itamura, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A Microfluidic Hydrogen Generator for Fuel Cell Applications

Description: A study of the reaction rates, heat and mass transfer and flow, in and from a methanol reforming catalytic micro-reactor fabricated on a silicon wafer is presented. Comparison of computed and measured conversion efficiencies are shown to be favorable.
Date: September 16, 2003
Creator: Benett, W.; Chung, J.; Greif, R.; Grigoropoulos, C. P.; Harvey, C.; Havstad, M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Use of field experimental studies to evaluate emergency response models

Description: The three-dimensional diagnostic wind field model (MATHEW) and the particle-in-cell atmospheric transport and diffusion model (ADPIC) are used by the Atmospheric Release Advisory Capability to estimate the environmental consequences of accidental releases of radioactivity into the atmosphere. These models have undergone extensive evaluations against field experiments conducted in a variety of environmental settings ranging from relatively flat to very complex terrain areas. Simulations of trace… more
Date: July 16, 1985
Creator: Gudiksen, P. H.; Lange, R.; Rodriguez, D. J. & Nasstrom, J. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Simple relationships for estimating intraparticle transport effects for catalytically promoted endothermic reactions

Description: Relationships for estimating effectiveness factors for porous-solid-catalyzed fluid reactions can result from assuming approximations to temperature and concentration profiles. Approximations designed to simplify the outcome result in simple, explicit, analytic relationships for both isothermal and nonisothermal nth-order reaction systems. For isothermal systems, formulas developed predict effectiveness within 25% of the true isothermal effectiveness factors ({eta}`s) over the range 0.1 > {eta}… more
Date: June 16, 1998
Creator: Brown, L. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Methyl chloride via oxyhydrochlorination of methane: A building block for chemicals and fuels from natural gas. Quarterly technical progress report No. 01, September 30, 1996--December 31, 1996

Description: The objectives of this cooperative agreement are to develop the oxyhydrochlorination (OHC) process for the conversion of methane to methyl chloride. In the first Phase of the project, Dow Corning has developed a stable selective catalyst and demonstrated the technology on a laboratory and a pilot plant scale. Specific tasks to achieve these objectives have been developed as follows: TASK 1 Fundamental Technical and Economic Evaluation TASK 2 Catalyst Selection Optimization and Characterization … more
Date: January 16, 1997
Creator: Wineland, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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