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93
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85
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59
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49
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25
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23
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636 Matching Results
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History and Evolution of Control Banding: A Review
Control Banding (CB) strategies offer simplified solutions for controlling worker exposures to constituents often encountered in the workplace. The original CB model was developed within the pharmaceutical industry; however, the modern movement involves models developed for non-experts to input hazard and exposure potential information for bulk chemical processes, receiving control advice as a result. The CB approach utilizes these models for the dissemination of qualitative and semi-quantitative risk assessment tools being developed to complement the traditional industrial hygiene model of air sampling and analysis. It is being applied and tested in small and medium size enterprises (SMEs) within developed countries and industrially developing countries; however, large enterprises (LEs) have also incorporated these strategies within chemical safety programs. Existing research of the components of the most available CB model, the Control of Substances Hazardous to Health (COSHH) Essentials, has shown that exposure bands do not always provide adequate margins of safety, that there is a high rate of under-control errors, that it works better with dusts than with vapors, that there is an inherent inaccuracy in estimating variability, and that when taken together the outcomes of this model may lead to potentially inappropriate workplace confidence in chemical exposure reduction in some …
Date:
July 19, 2006
Creator:
Zalk, D. & Nelson, D.
Object Type:
Article
System:
The UNT Digital Library
Performance and scaling of locally-structured grid methods forpartial differential equations
In this paper, we discuss some of the issues in obtaining high performance for block-structured adaptive mesh refinement software for partial differential equations. We show examples in which AMR scales to thousands of processors. We also discuss a number of metrics for performance and scalability that can provide a basis for understanding the advantages and disadvantages of this approach.
Date:
July 19, 2007
Creator:
Colella, Phillip; Bell, John; Keen, Noel; Ligocki, Terry; Lijewski, Michael & Van Straalen, Brian
Object Type:
Article
System:
The UNT Digital Library
On-Line Coolant Chemistry Analysis
Impurities in the gas coolant of the space nuclear power plant (SNPP) can provide valuable indications of problems in the reactor and an overall view of system health. By monitoring the types and amounts of these impurities, much can be implied regarding the status of the reactor plant. However, a preliminary understanding of the expected impurities is important before evaluating prospective detection and monitoring systems. Currently, a spectroscopy system is judged to hold the greatest promise for monitoring the impurities of interest in the coolant because it minimizes the number of entry and exit points to the plant and provides the ability to detect impurities down to the 1 ppm level.
Date:
July 19, 2006
Creator:
Bachman, LM
Object Type:
Report
System:
The UNT Digital Library
Check Row Planter
Patent for check row planter. Illustration included.
Date:
July 19, 1904
Creator:
Perkins, Albert L.
Object Type:
Patent
System:
The Portal to Texas History
Colter Attachment for Plows.
Patent for a new and useful colter attachment for plows, including instructions and illustrations.
Date:
July 19, 1898
Creator:
Haynes, Thomas
Object Type:
Patent
System:
The Portal to Texas History
Coffee - Pot.
Patent for a new and useful coffee pot, including instructions and illustrations.
Date:
July 19, 1898
Creator:
Ingle, Jacob Odem
Object Type:
Patent
System:
The Portal to Texas History
Back Spacing Attachment for Type Writing Machines
Patent for an attachment to provide type writing machines with back space. Illustration included.
Date:
July 19, 1904
Creator:
Parker, William A.
Object Type:
Patent
System:
The Portal to Texas History
Apparatus for Manufacturing Heating and Illuminating Gas
Patent for an apparatus for manufacturing heating and illuminating gas. Illustration included.
Date:
July 19, 1910
Creator:
Wynne, Milton P. & Wagley, Samuel L.
Object Type:
Patent
System:
The Portal to Texas History
Artificial Fuel
Patent for artificial fuel made from coal.
Date:
July 19, 1904
Creator:
Thomas, Adelaide M.
Object Type:
Patent
System:
The Portal to Texas History
Advanced gas cooled nuclear reactor materials evaluation and development program. Progress report, January 1, 1979-March 31, 1979
This report presents the results of work performed from January 1, 1979 through March 31, 1979 on the Advanced Gas Cooled Nuclear Reactor Materials Evaluation and Development Program. The objectives of this program are to evaluate candidate alloys for Very High Temperature Reactor (VHTR) Nuclear Process Heat (NPH) and Direct Cycle Helium Turbine (DCHT) applications, in terms of the effect of simulated reactor primary coolant (helium containing small amounts of various other gases), high temperatures, and long time exposures, on the mechanical properties and structural and surface stability of selected candidate alloys. Work covered in this report includes the activities associated with the creep-rupture testing of the test materials for the purpose of verifying the stresses selected for the screening creep test program, and the status of the simulated reactor helium supply system, testing equipment, and gas chemistry analysis instrumentation and equipment.
Date:
July 19, 1979
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Rate of Burnout of Absorbers
Report discussing change in absorptivity of some rare earth elements over time.
Date:
July 19, 1949
Creator:
Gillette, P. R.
Object Type:
Report
System:
The UNT Digital Library
Seismic design and development for fast reactors: a design-application perspective with directions for improvement
Applications of seismic design criteria and qualification methods to the US breeder reactor projects have developed new findings, improvements in design methods, and identified areas for further development. Discussions are presented regarding site free field motion, soil-structure interaction, equipment response spectra, piping, snubbers and support design analyses, dynamic decoupling, seismic qualification testing, and protection of Seismic Category I components from Non-Category I equipment failures.
Date:
July 19, 1979
Creator:
Severud, L. K.
Object Type:
Article
System:
The UNT Digital Library
Investigation of Ammonium Uranates
This report studies ammonium dichromate and the conditions it needs to be under in order to precipitate and be isolated from an aqueous system.
Date:
July 19, 1956
Creator:
Ewing, Robert A.; Kiehl, Samuel J. & Bearse, Arthur E.
Object Type:
Report
System:
The UNT Digital Library
Microwave kinoform for magnetic fusion
A microwave kinoform that modifies both the phase and polarization of an incident wavefront has been designed. This kinoform for the TMX-U magnetic fusion experiment has been fabricated and tested. The design procedure, method of fabrication, and experimental test results are discussed.
Date:
July 19, 1983
Creator:
Gallagher, N.C. Jr. & Sweeney, D.W.
Object Type:
Article
System:
The UNT Digital Library
Cascade geothermal drilling/corehole N-1
Two core holes have been completed on the flanks of Newberry Volcano, Oregon. Core hole GEO N-1 has a heat flow of 180 mWm-2 reflecting subsurface temperature sufficient for commerical exploitation of geothermally generated electricity. GEO N-3, which has a heat flow of 86 mWm-2, is less encouraging. Considerable emphasis has been placed on the ''rain curtain'' effect with the hope that a detailed discussion of this phenomenon at two distinct localities will lead to a better understanding of the physical processes in operation. Core hole GEO N-1 was cored to a depth of 1387 m at a site located 9.3 km south of the center of the volcano. Core hole GEO N-3 was cored to a depth of 1220 m at a site located 12.6 km north of the center of the volcano. Both core holes penetrated interbedded pyroclastic lava flows and lithic tuffs ranging in composition from basalt to rhyolite with basaltic andesite being the most common rock type. Potassium-argon age dates range up to 2 Ma. Difficult drilling conditions were encountered in both core holes at depths near the regional water table. Additionally, both core holes penetrate three distinct thermal regimes (isothermal (the rain curtain), transition, and …
Date:
July 19, 1988
Creator:
Swanberg, C.A.; Combs, J. (Geothermal Resources International, Inc., San Mateo, CA (USA)) & Walkey, W.C. (GEO Operator Corp., Bend, OR (USA))
Object Type:
Report
System:
The UNT Digital Library
Fiscal Year 2019 Defense Appropriations Bill: An Overview of Housepassed H.R. 6157
This report provides an overview of the appropriations and provisions of the FY2019 Defense Appropriations Bill, such as proposed funding cuts and increases.
Date:
July 19, 2018
Creator:
Towell, Pat
Object Type:
Report
System:
The UNT Digital Library
Trade Adjustment Assistance (TAA) and Its Role in U.S. Trade Policy
This report looks at the background of Trade Adjustment Assistance (TAA) in the Trade Expansion Act of 1962, which was created by Congress. It then discusses how the 112th Congress is considering legislative action to extend the TAA - including two issues: how necessary or appropriate the extension is, and whether or not three proposed bills should be voted upon separately.
Date:
July 19, 2011
Creator:
Hornbeck, J. F. & Rover, Laine Elise
Object Type:
Report
System:
The UNT Digital Library
Newsmap. Monday, July 19, 1943 : week of July 8 to July 15, 201st week of the war, 83rd week of U.S. participation
Front: Text describes action on various war fronts: Sicily, Air offensive, Russia, New Georgia, New Guinea, Aleutians, Submarines. Includes list of senior commanders in the Invasion of Italy. Maps: New Georgia Islands; American 7th army positions in Licata and Vittoria Italy. Inset map: Italy and surrounding islands. Illustration: Landing on the underside [Allied air attack on ships unloading military cargo on the beaches of Southern Sicily]. Back: Text and color illustrations include various methods of enemy gas applications.
Date:
July 19, 1943
Creator:
[United States.] Army Orientation Course.
Object Type:
Poster
System:
The UNT Digital Library
Mexico’s 2012 Elections
This report provides an overview of the parties and candidates who competed in the Mexican federal elections with a focus on the presidential contest, recaps the election results, and discusses some potential implications of the elections for U.S.-Mexican security cooperation, North American economic integration, and U.S. energy security.
Date:
July 19, 2012
Creator:
Ribando Seelke, Clare
Object Type:
Report
System:
The UNT Digital Library
Canopy for Folding Beds.
Patent for a new and improved canopy for folding beds. This design "will automatically fold up within the bed when the same is closed, and will similarly open out with the opening of the bed without any other attention than the proper arrangement of the folds of the mosquito or fly netting" (lines 21-25). It consists in "an automatically raising and lowering canopy consisting of a raising-frame having vertical bars pivoted to the bed at the bottom and a horizontal connecting-bar at the top, a canopy-top frame pivoted to the bed-casing, having side bars and a horizontal connecting-bar, and couplings" (lines 13-19).
Date:
July 19, 1892
Creator:
Eva, Addison H.
Object Type:
Patent
System:
The Portal to Texas History
Car Coupling
Patent for a new coupling mechanism that will automatically couple railway cars together without human assistance.
Date:
July 19, 1892
Creator:
Faubion, John Sr.
Object Type:
Patent
System:
The Portal to Texas History
Bag.
Patent for a new and improved bag. This design is "compris[ed of] the body divided down its front, one edge having staples and the other edge having openings adapted to engage said staples, a covering-flap provided with an opening adapted to engage one of said staples, and a flexible fastening device secured to said bag and adapted to be passed through said staples for securing the edges and covering-flap" (lines 62-71).
Date:
July 19, 1887
Creator:
Franks, Lewis Wigfall
Object Type:
Patent
System:
The Portal to Texas History
Car Coupling.
Patent for a new and improved coupling for railroad cars. This design is "to provide a novel car-coupling pin and means for operating the same to automatically couple cars through the medium of ordinary links without the use of triggers located within the draw-head . . . The invention consists, essentially, in a vertically-movable coupling-pin adapted to rotate axially in the pin-hole of the draw-head, and having a wing or lug for supporting it in its elevated position, combined with a yielding draw-head having a vertical slot to receive the wing or lug and a shoulder to support the same" (lines 8-22).
Date:
July 19, 1887
Creator:
Power, Kelsey L.
Object Type:
Patent
System:
The Portal to Texas History
Combined Fire Screen and Fender.
Patent for a combined fire screen and fender. This design "works in the mantle-piece by means of weights, and is secured in position by by means of a spring-latch that catches in notches in the jamb. This screen thus arranged can be made to answer for three purposes: By letting it down nearly to the hearth it acts as a blower; by letting it entirely down accidents from fire are prevented, and when let down in the summer time it makes a handsome summer screen" (lines 21-30).
Date:
July 19, 1881
Creator:
Matthews, James Charles
Object Type:
Patent
System:
The Portal to Texas History