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Future algorithm research needs for partitioning in solid mechanics and coupled mechanical models

Description: Exceptional progress has been made in mathematical algorithm research leading to optimized mesh partitions for the highly unstructured grids occurring in finite element applications in solid mechanics. Today another research challenge presents itself. Research is needed to include boundary conditions into the algorithms for partitioning meshes. We describe below two methods we use currently to accomplish this and propose a more general approach be developed which would apply to our problems tod… more
Date: October 6, 1997
Creator: Hoover, C. G.; DeGroot, A. J. & Sherwood, R. J.
Item Type: Refine your search to only Article
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Evaluation of intrusion sensors and video assessment in areas of restricted passage

Description: This report discusses an evaluation of intrusion sensors and video assessment in areas of restricted passage. The discussion focuses on applications of sensors and video assessment in suspended ceilings and air ducts. It also includes current and proposed requirements for intrusion detection and assessment. Detection and nuisance alarm characteristics of selected sensors as well as assessment capabilities of low-cost board cameras were included in the evaluation.
Date: April 1, 1996
Creator: Hoover, Chris E. & Ringler, Charles E.
Item Type: Refine your search to only Report
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Cell and stack design alternatives. Second quarterly report, November 1, 1978-January 31, 1979

Description: Work on the design of an on-site fuel cell total energy system for an apartment building is described. A mass and energy balance was completed for one operating point of a selected power generation sub-system with a power output of 119 kW. Potentially, 87 percent of the LHV of the input fuel is available as bus bar electricity or useful heat. A 2 kW stack of conventional design and a 0.5 kW DIGAS cooled stack have been constructed and are on test at ERC. Renovation of a space for the Westinghou… more
Date: February 14, 1979
Creator: Hoover, D. Q.
Item Type: Refine your search to only Report
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Development and evaluation of an automated reflectance microscope system for the petrographic characterization of bituminous coals

Description: The development of automated coal petrographic techniques will lessen the demands on skilled personnel to do routine work. This project is concerned with the development and successful testing of an instrument which will meet these needs. The fundamental differences in reflectance of the three primary maceral groups should enable their differentiation in an automated-reflectance frequency histogram (reflectogram). Consequently, reflected light photometry was chosen as the method for automating … more
Date: October 1, 1980
Creator: Hoover, D. S. & Davis, A.
Item Type: Refine your search to only Report
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Cell and stack design alternatives. First quarterly report, August 1, 1978-October 31, 1978

Description: An apartment house in Albany, New York with HUD minimum insulation was selected as the application to be used in evaluating various system configurations of on-site fuel cell total energy systems. Methods for calculating the static and dynamic thermal loads for a simulated season were developed. Computer models of some major subsystems are now being developed. Finite element models of the electrochemistry, thermodynamics and heat transfer relationships for fuel cells were developed and have bee… more
Date: January 1, 1979
Creator: Hoover, D.Q.
Item Type: Refine your search to only Report
open access

Preliminary Analysis of Two Aspects of Magma-Powered Electric-Generation Plants

Description: Two aspects critical to the development of magma electric generation plants using closed heat exchanger systems are addressed. The heat transfer between the cold fluid in the downcomer and the hot fluid in the upcomer is analyzed using an NTU-effectiveness technique. The results indicate the hot fluid must be thermally insulated from the colder fluid in order to yield a useful temperature difference at the surface. A preliminary system analysis is conducted to determine the well cost requiremen… more
Date: September 1980
Creator: Hoover, E. R.
Item Type: Refine your search to only Report
open access

Failure mechanisms of polycrystalline diamond compact drill bits in geothermal environments

Description: Over the past few years the interest in polycrystalline diamond compact (PDC) drill bits has grown proportionately with their successful use in drilling oil and gas wells in the North Sea and the United States. This keen interest led to a research program at Sandia to develop PDC drill bits suitable for the severe drilling conditions encountered in geothermal fields. Recently, three different PDC drill bits were tested using either air or mud drilling fluids: one in the laboratory with hot air,… more
Date: September 1, 1981
Creator: Hoover, E. R. & Pope, L. E.
Item Type: Refine your search to only Report
open access

Comparative analysis of combined flat-plate PV/T collectors with separate photovoltaic and thermal collectors

Description: The conditions under which a combined photovoltaic/thermal (PV/T) collector is more cost effective than separate flat-plate photovoltaic and thermal collectors are determined. The annual performance of the separate PV/T system and four different combined PV/T systems are simulated. Based on the equivalent electrical and thermal outputs and the 1986 DOE cost goal for PV modules (70 cents/Wp), the maximum allowable incremental cost to upgrade the conventional thermal collector to a combined PV/T … more
Date: January 1, 1981
Creator: Hoover, E.R.
Item Type: Refine your search to only Article
open access

Remote Mine Detection Technologies for Land and Water Environments

Description: The detection of mines, both during and after hostilities, is a growing international problem. It limits military operations during wartime and unrecovered mines create tragic consequences for civilians. From a purely humanitarian standpoint an estimated 100 million or more unrecovered mines are located in over 60 countries worldwide. This paper presents an overview of some of the technologies currently being investigated by Sandia National Laboratories for the detection and monitoring of minef… more
Date: May 11, 1999
Creator: Hoover, Eddie R.
Item Type: Refine your search to only Article
open access

Mid-Year Summary Report October 1, 1960-March 31, 1961 Army Pwr Support and Development Program

Description: Abstract: A cyclic stress analysis of the SM-1 primary system was carried out. Problems encountered in the fabrication of PM-2A Core II and SM-lA Core II are described, and the results of an examination of damaged SM-lA Core I stationary fuel elements reported. A preliminary study of the radiation damage to SM-1 reactor vessel was made and the possibility of annealing the vessel discussed. Performance analyses are presented for five cores: SM-1 Core, SM-1 Core 1 rearranged and spiked, SM-1 Core… more
Date: June 2, 1961
Creator: Hoover, H. L.
Item Type: Refine your search to only Report
open access

SM-2 REACTOR CORE AND VESSEL REVIEW REPORT FOR PERIOD DECEMBER 15, 1959 TO MARCH 18, 1960

Description: The SM-2 core lifetime was calculated and stuck rod criteria formulated. The control system could shutdown the core under the most adverse conditions with any single rod stuck out. The one-half-inch Eu/sub 2/O/sub 3/ flux supressors adequately supressed the power spike at the bottom of the core. The nuclear effects of increasing the dimensione of the fuel matrix were calculated. A new analysis of various reactivity measuremerts performed durirg the SM-2 critical experiments was made to test the… more
Date: March 30, 1960
Creator: Hoover, H.L.
Item Type: Refine your search to only Report
open access

Lateral-control characteristics of North American XP-51 airplane (A. C. No. 41-38) with beveled trailing-edge ailerons in high-speed flight

Description: Report presenting the flight tests of beveled trailing-edge ailerons on the North American XP-51 airplane which were extended to determine the aileron characteristics in high-speed dives. Standard recording instruments were used to determine airspeed, aileron position, stick force, and rate of roll. The results show that the beveled trailing-edge form of aerodynamic balance had no abnormal or unusual characteristics in high-speed flight.
Date: November 1942
Creator: Hoover, Herbert H. & White, Maurice D.
Item Type: Refine your search to only Report
open access

A sitewide approach to the characterization and use of soil and groundwater background at the Hanford Site

Description: A Sitewide approach to the characterization and use of soil and groundwater background has been developed for use in environmental restoration activities on the Hanford Site. Sitewide background more accurately represents the range of background compositions that exist in soil and groundwater at the over 140 Resource Conservation and Recovery Act of 1976 facilities and Comprehensive Environmental Response, Compensation, and Liability Act of 1980 operable units, and provides a more consistent, c… more
Date: October 1, 1993
Creator: Hoover, J. D.; Ruck, F. A.; LeGore, T. & Thompson, K. M.
Item Type: Refine your search to only Article
open access

Cell-module and fuel-conditioner development. 8th quarterly report, July-September 1981

Description: Progress on the second Phase of a six Phase program to develop commercially viable on-site integrated energy systems (OS/IES) using phosphoric acid fuel cell (PAFC) modules to convert fuel to electricity is reported. Phase II is a planned two year effort to develop appropriate fuel cell module and fuel conditioner conceptual designs. The fuel cell module development effort comprises three coordinated tasks: (1) design of large cell stacks; (2) stack fabrication; and (3) stack testing. The resul… more
Date: October 1, 1981
Creator: Hoover, Jr., D. Q.
Item Type: Refine your search to only Report
open access

Hanford Protective Barriers Program Water-Erosion Studies, FY 1989

Description: Pacific Northwest Laboratory (PNL) is conducting the water-erosion control task of the Hanford Protective Barriers Program to assess barrier stability against soil erosion and slumping. The purpose of the barriers is to protect shallow-burial waste sites at the Hanford Site from water infiltration, biointrusion, and surficial erosion for up to 10,000 years. These aboveground, mounded structures will consist of layered, fine-grained sediment and rock designed to direct surface- and ground-water … more
Date: June 1990
Creator: Hoover, K. A.; Cadwell, L. L. & Walters, W. H.
Item Type: Refine your search to only Report
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