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Specifications for Selected Hydraulic-Powered Roof Supports: With a Methods to Estimate Support Requirement for Longwalls

Description: Report issued by the Bureau of Mines discussing hydraulic-powered roof support specifications. As stated in the abstract, "this report presents observations made by Bureau engineers regarding hydraulic-powered roof supports that are currently being used or have been used on nearly all operating long-walls in the United States" (p. 1). This report includes tables, and illustrations.
Date: September 1969
Creator: Barry, A. J.; Nair, O. B. & Miller, J. S.
Partner: UNT Libraries Government Documents Department

Model Supports and Their Effects on the Results of Wind Tunnel Tests

Description: "The airflow about a model while being tested is often sufficiently affected by the model support to lead to erroneous conclusions unless appropriate corrections are used. In this paper some new material on the subject is presented, together with a review of the airfoil support corrections used in several other laboratories" (p. 1).
Date: February 1923
Creator: Bacon, David L.
Partner: UNT Libraries Government Documents Department

Experimental investigation of interference effects of lateral-support struts on afterbody pressures at Mach 1.9

Description: Report presenting testing of a series of single and double unswept, lateral-support struts at a Mach number of 1.9 on a cone-cylinder body at zero angle of attack. The struts consisted of a rectangular box section with identical wedge fairings fore and aft. Results regarding the shock-wave intersections and pressure distributions are provided.
Date: May 14, 1956
Creator: Klann, John L. & Huff, Ronald G.
Partner: UNT Libraries Government Documents Department

Farm Program Spending: What's Permitted Under the Uruguay Round Agreements

Description: This report discusses farm income and commodity price support proposals that might succeed the programs due to expire in 2002. A key question being asked of virtually every new proposal is how it will affect U.S. commitments under the 1994 Uruguay Round Agreement on Agriculture (URAA), which commitsthe United States to spend no more than $19.1 billion annually on domestic farm supports most likely to distort trade. The URAA spells out the rules for countries to determine whether their policies are potentially trade distorting, and to calculate the costs.
Date: March 13, 2001
Creator: Becker, Geoffrey S.
Partner: UNT Libraries Government Documents Department

Development of a high gradient quadrupole for the LHC Interaction Regions

Description: A collaboration of Fermilab, Lawrence Berkeley National Laboratory and Brookhaven National Laboratory is engaged in the design of a high gradient quadrupole suitable for use in the LHC interaction regions. The cold iron design incorporates a two-layer, cos(2{theta}) coil geometry with a 70 mm aperture operating in superfluid helium. This paper summarizes the progress on a magnetic, mechanical and thermal design that meets the requirements of maximum gradient above 250 T/m, high field quality and provision for adequate cooling in a high radiation environment.
Date: April 1, 1997
Creator: Bossert, R.; Feher, S. & Gourlay, S.A.
Partner: UNT Libraries Government Documents Department

Characterization of microenvironment polarity and solvent accessibility of polysilsesquioxane xerogels by the fluorescent probe technique

Description: Poly (1, 4 bis(triethoxysilyl)benzene) (PTESB), a representative of a new type of organic-inorganic hybrid polysilsesquioxane material, was characterized by fluorescence spectroscopy for both microenvironmental polarity and solvent accessibility. A dansyl fluorescent molecule was incorporated into the bulk as well as onto the surface of both PTESB and silica materials. Information about the microenvironment polarity and accessibility of PTESB to various organic solvents was determined and compared to that of silica gel. This study found that both the bulk and surface of PTESB are less polar than that of the silica material. The silica material is accessible to polar solvents and water, while YMB is accessible to polar solvents but not to water. The hydrophobicity of PTESB differentiates these new materials from silica gel.
Date: May 1, 1995
Creator: Shea, K.J.; Zhu, H.D. & Loy, D.A.
Partner: UNT Libraries Government Documents Department

Weapon foam accelerated aging using dynamic mechanical analysis

Description: Rigid polyurethane foams are used for supports and as encapsulants for electronic assemblies in almost all weapon systems. Mechanical properties (storage, loss, rubbery, and glassy moduli) of three foams are being evaluated; the test scheme is illustrated. Aging tests are also being run on the long-term performance of foams being used in the Russian Fissile Material Container; there was no significant change in the glass transition temperature, glassy modulus, or rubbery modulus after one year of aging.
Date: March 1, 1996
Creator: Rand, P.B. & Hance, B.G.
Partner: UNT Libraries Government Documents Department

Analysis of EB support saddles and forces between modules during assembly.

Description: As the EB Tile Calorimeter is constructed, the support saddles and the modules will be subjected to different forces, stresses, and deflections than when completely assembled. The purpose of this analysis is to examine the forces, stresses, and deflections acting on the support saddles and modules at various stages of assembly.
Date: August 13, 2002
Creator: Guarino, V.
Partner: UNT Libraries Government Documents Department

Analysis of the connections between modules in the EB.

Description: Over the last several years, calculations have been performed to find the forces that are acting between modules and on the support saddles in the EB. This paper examines these forces and calculates the stresses in the connections between modules. In the Tile Calorimeter, the modules are only connected at three points. First, at the inner radius there is a bearing connection to support the force in the phi direction. Second, at the outer radius there is a bearing connection in the phi direction and, finally, there is a bolted connection designed to withstand the radial load. Each of these connections will be examined separately.
Date: August 1, 2002
Creator: Guarino, V.
Partner: UNT Libraries Government Documents Department

Surveying the monument system at Lawrence Berkeley Laboratory`s Advanced Light Source accelerator

Description: Particle accelerators with demanding alignment requirements face a need for periodic re-surveying of their reference monument systems. At the ALS, significant foundation settling and the necessary relocation of some floor monuments mean that the entire system of over 100 monuments must be re-surveyed to an accuracy of 100 microns at two year intervals. Last Fall, the monument survey was conducted entirely by the in-house Survey and Alignment crew using a simplified instrument mounting system and an inexpensive commercial software package. Precision levels, plummets, theodolites, and an electronic distance measuring system were used with the innovative ``Monopod`` instrument mounting system in a cost effective approach to this critical task.
Date: April 1, 1995
Creator: Thur, W. & Lauritzen, T.
Partner: UNT Libraries Government Documents Department