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Density and Thermal Expansion of Ethyl Alcohol and of its Mixtures with Water

Description: Report issued by the Bureau of Standards over the thermal expansion of ethyl alcohol. As stated in the introduction, "the scope of the present work includes the preparation of pure anhydrous ethyl alcohol, the determination of the density and thermal expansion of this alcohol and its mixtures with water, and the construction from these data of tables for convenient use" (p. 328). This report includes tables, and illustrations.
Date: 1913
Creator: Osborne, N. S.; McKelvy, E. C. & Bearce, H. W.
Partner: UNT Libraries Government Documents Department

Thermal relations for two-phase expansion with phase equilibrium and example for combustion products of boron-containing fuel

Description: Report presenting a procedure for integrating equations involving pressure, temperature, and density in order to analyze an expansion process that occurs when boric oxide from fuels condenses during expansion. An example is provided to illustrate the manner in which the equations can be used to analyze a one-dimensional expansion with phase equilibrium.
Date: May 20, 1957
Creator: Tower, Leonard K.
Partner: UNT Libraries Government Documents Department

Notes on the theoretical characteristics of two-dimensional supersonic airfoils

Description: The shock expansion method of the NACA TN No. 1143 was used to determine the principal aerodynamic characteristics of two-dimensional supersonic airfoils. A discussion is given of the effect of thickness ratio, free-stream Mach number, angle of attack, camber, thickness distribution, and aileron deflection. The calculations indicated that the minimum drag of supersonic airfoils is obtained when the maximum thickness is behind the 0.50 chord. The center of pressure obtained for a symmetrical supersonic airfoil was found to be ahead of the 0.50 chord.
Date: January 1947
Creator: Ivey, H. Reese
Partner: UNT Libraries Government Documents Department

Thermal Expansion of Insulating Materials

Description: Scientific paper issued by the Bureau of Standards over studies on thermal expansion. Expansivity tests are conducted on many different insulating materials. The results of the tests are discussed. This paper includes tables, photographs, and illustrations.
Date: December 27, 1919
Creator: Souder, Wilmer H. & Hidnert, Peter
Partner: UNT Libraries Government Documents Department

Measurements on the Thermal Expansion of Fused Silica

Description: Scientific paper issued by the Bureau of Standards over thermal expansion of fused silica. As stated in the abstract, "this paper gives the results of an investigation on the thermal expansion of transparent and nontransparent fused silica for various temperature ranges between -125 and +1,000 degrees Celsius. A detailed description of the apparatus and the methods used in this research and a summary of available data obtained by previous observers on the thermal expansion of fused silica are given" (p. 1). This paper includes tables, photographs, and illustrations.
Date: April 13, 1926
Creator: Souder, Wilmer H. & Hidnert, Peter
Partner: UNT Libraries Government Documents Department

Calculation of the supersonic pressure distribution on a single-curved tapered wing in regions not influenced by the root or tip

Description: Report presenting the use of the shock-expansion method for the calculation of the pressure distribution on cylindrical wings in supersonic flow as extended to tapered wings made up of single-curved surfaces. The method applies in regions of the wing where the component of velocity normal to the surface rulings is supersonic and the flow is not influenced by the presence of the root or tip.
Date: June 1955
Creator: Vincenti, Walter G. & Fisher, Newman H., Jr.
Partner: UNT Libraries Government Documents Department

A New Interferential Dilatometer

Description: Scientific paper issued by the Bureau of Mines over development of a dilatometer. The instrument is used in tests of thermal expansion. The methods are presented and discussed. This paper includes an illustration.
Date: February 28, 1920
Creator: Priest, Irwin G.
Partner: UNT Libraries Government Documents Department

Tables of Industrial Gas Container Contents and Density for Oxygen, Argon, Nitrogen, Helium, and Hydrogen

Description: Abstract: Custody transfer tables are presented for oxygen, argon, nitrogen, helium, and hydrogen. The tables are based on standard reference data previously compiled by the National Bureau of Standards. Two sets of tables are provided for each fluid. Tables in engineering units cover the range -40 to 130*F with pressures from 100 to 10,000 prig. Tables in SI units (density versus pressure and temperature) cover the range 200 to 370 K with pressures from 0.5 to 70 MPa. The tables in engineering units are designed to provide a means of determining the volume of gas at standard conditions contained in a tank given the volume of the tank and the pressure and temperature of the gas within the tank. The publication also includes four examples of use of the tables in calculating tank quantities.
Date: June 1985
Creator: Younglove, Ben A. & Olien, Neil A.
Partner: UNT Libraries Government Documents Department

A Second-Order Shock-Expansion Method Applicable to Bodies of Revolution Near Zero Lift

Description: "A second-order shock-expansion method applicable to bodies of revolution is developed by the use of the predictions of the generalized shock-expansion method in combination with characteristics theory. Equations defining the zero-lift pressure distributions and the normal-force and pitching-moment derivatives are derived. Comparisons with experimental results show that the method is applicable at values of the similarity parameter, the ratio of free-stream Mach number to nose fineness ratio, from about 0.4 to 2" (p. 1).
Date: 1957
Creator: Syvertson, Clarence A. & Dennis, David H.
Partner: UNT Libraries Government Documents Department

Calculation of Turbulent Expansion Processes

Description: "On the basis of certain formulas recently established by L. Prandtl for the turbulent interchange of momentum in stationary flows, various cases of "free turbulence" - that is, of flows without boundary walls - are treated in the present report. Prandtl puts the apparent shearing stress introduced by the turbulent momentum interchange. This present report deals first with the mixing of an air stream of uniform velocity with the adjacent still air, than with the expansion or diffusion of an air jet in the surrounding air space" (p. 1).
Date: September 1945
Creator: Tollmien, Walter
Partner: UNT Libraries Government Documents Department

Heat-Exchanger-Core Weights for Use With Hydrogen-Expansion Turbine

Description: Memorandum presenting an analysis of probable heat-exchanger weights for stationary and rotary regenerator heat exchangers for use in a hydrogen-expansion turbine engine. This is because rotary regenerators offer possibilities for a considerably lighter heat-exchanger core, possibly one-fourth that of the stationary regenerators.
Date: October 3, 1957
Creator: Reynolds, Thaine W.
Partner: UNT Libraries Government Documents Department

Frequency dependent thermal expansion in binary viscoelasticcomposites

Description: The effective thermal expansion coefficient beta* of abinary viscoelastic composite is shown to be frequency dependent even ifthe thermal expansion coefficients beta A and beta B of both constituentsare themselves frequency independent. Exact calculations for binaryviscoelastic systems show that beta* is related to constituent valuesbeta A, beta B, volume fractions, and bulk moduli KA, KB, as well as tothe overall bulk modulus K* of the composite system. Then, beta* isdetermined for isotropic systems by first bounding (or measuring) K* andtherefore beta*. For anisotropic systems with hexagonal symmetry, theprincipal values of the thermal expansion beta*perp and beta*para can bedetermined exactly when the constituents form a layered system. In allthe examples studied, it is shown explicitly that the eigenvectors of thethermoviscoelastic system possess non-negative dissipation -- despite thecomplicated analytical behavior of the frequency dependent thermalexpansivities themselves. Methods presented have a variety ofapplications from fluid-fluid mixtures to fluid-solid suspensions, andfrom fluid-saturated porous media to viscoelastic solid-solidcomposites.
Date: December 1, 2007
Creator: Berryman, James G.
Partner: UNT Libraries Government Documents Department

Computer-operated quartz differential dilatometer

Description: From international symposium on thermal expansion of solids; Lake of the Czarks, Missouri, USA (7 Nov 1973). A quartz differential dilatometer was interfaced with a Digital Equipment Corporation PDP-8 computer to automatically measure the thermal expansion of solids from 300 to 1000 K. A Carson-Dice Electronic-Mechanicai Micrometer, readable to 2.5 x 10/sup -6/ cm, was employed for length-change measurements accurate to 2.5 x 10/sup -5/ cm. Calibrated Pt/Pt/ sub 90/Rh/sub 10/ thermocouples were used to measure temperature changes to plus or minus 0.22 K. The software and hardware necessary to completely automate the measurements are described. Measurements on National Bureau of Standards certified quartz, tungsten, and copper specimens demonstrated an accuracy of plus or minus 1.5% in determination of the coefficient of thermal expansion. (auth)
Date: January 1, 1973
Creator: Kollie, T.G.; McElroy, D.L.; Hutton, J.T. & Ewing, W.M.
Partner: UNT Libraries Government Documents Department

The Expansion of a Retail Chain: An Analysis of Wal-Mart Locations in the United States

Description: Retail geography is an expanding field that is becoming increasingly important within academia, the business environment, and the national and global economy. The focus of this study is to provide insight and additional understanding of the site selection processes employed by Wal-Mart in the United States. The research studies Wal-Mart from a national perspective and investigates the patterns of retail store expansion across the United States from 1990 to 2005. The study employs the use of a continuous Poisson model to check for significant clustering, and a single and multiple correlation analysis to identify the types of relationships that exist between retail stores and location. The results of the study make apparent several distinct patterns of retail store dispersion within the United States between the years 1990 to 2005.
Date: May 2011
Creator: Ostrander, Anthony P.
Partner: UNT Libraries

The South and the Mexican War

Description: This thesis examines newspapers and correspondence of public men in the era of the Mexican war to provide some answers to pertinent questions regarding the South's role in the Mexican War. It attempts to reveal to some degree whether Southerners uniformly supported the war, whether their support arose from an expansionist sentiment or a desire to extend the area of slavery, whether any strong opposition to the war existed in the South, and why they supported or opposed it.
Date: December 1970
Creator: Lowe, Billie Lynne Owens
Partner: UNT Libraries

“A Metaphor for the Impossibility of Togetherness”: Expansion Processes in Gubaidulina’s First String Quartet

Description: This thesis illustrates how I hear processes of expansion organizing musical materials in the First String Quartet. By employing a flexible approach to expansion and developing models of wedge and additive expansions beyond the bounds of specific voice-leading or rhythmic augmentation procedures, expansion processes can be understood in each of the varied episodes of the quartet. Gubaidulina’s use of expansion processes, embodied organically in pitch, rhythm, form, and physical space, unifies the episodic materials of the First String Quartet and provides an inevitable conclusion to the work’s loose narrative.
Date: August 2012
Creator: Stroud, Cara
Partner: UNT Libraries

The Feasibility and Value of Broadband Communications in Rural Areas: A Preliminary Evaluation

Description: A report covering a study conducted by the Office of Technology Assessment (OTA). The study looks at "the feasibility and value of using broadband communications to provide public services for rural areas" (p. I-1).
Date: April 1976
Creator: United States. Congress. Office of Technology Assessment.
Partner: UNT Libraries Government Documents Department

Application of the Yoshida-Ruth Techniques to Implicit Integration and Multi-Map Explicit Integration

Description: The full power of Yoshida's technique is exploited to produce an arbitrary order implicit symplectic integrator and multi-map explicit integrator. This implicit integrator uses a characteristic function involving the force term alone. Also we point out the usefulness of the plain Ruth algorithm in computing Taylor series map using the techniques first introduced by Berz in his 'COSY-INFINITY' code.
Date: April 1, 1991
Creator: Forest, E.; Bengtsson, J. & Reusch, M.F.
Partner: UNT Libraries Government Documents Department

Effect of Design Variables on Performance of Mach 4.0 Hydrogen Expansion Engines

Description: Memorandum presenting performance calculations made for hypothetical hydrogen expansion engines in which only a small part of the engine airflow passes through the heat exchanger. The prescribed flight path was representative of those for long-range, high-speed aircraft. Results regarding the off-design operation and engine performance are provided.
Date: July 22, 1958
Creator: Dugan, James F., Jr.
Partner: UNT Libraries Government Documents Department

A Power-Series Solution for the Unsteady Laminar Boundary-Layer Flow in an Expansion Wave of Finite Width Moving Through a Gas Initially at Rest

Description: Note presenting a consideration of the equations of motion and energy for the laminar boundary layer flow in an expansion wave of finite width moving into undisturbed fluid, such as in a shock tube. Solutions in the form of infinite power series for velocity and local enthalpy functions were indicated and the first three terms of each series were numerically evaluated. Results regarding numerical information, a discussion of the results, a comparison with the solution of the zero-thickness expansion wave, and singularities in the flow field are provided.
Date: June 1957
Creator: Cohen, Nathaniel B.
Partner: UNT Libraries Government Documents Department

The Effects of Body Vortices and the Wing Shock-Expansion Field on the Pitch-Up Characteristics of Supersonic Airplanes

Description: Memorandum presenting a technique for predicting the influence of body vortices and the wing shock-expansion field on the pitch-up characteristics of supersonic airplanes to supplement the calculative methods for wing vortices which are well known. The method is applied to the prediction of the pitch-up characteristics of four airplanes with high tails, of which one serves as a calculative example.
Date: March 24, 1958
Creator: Nielsen, Jack N.
Partner: UNT Libraries Government Documents Department