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Theoretical analysis of one-stage windmills for reducing flow distortion

Description: Report presenting an analysis of two windmills for reducing flow distortion. Results regarding the windmill design, flow conditions, velocity distortions, total-pressure distortions, total-temperature distortions, and design value of the ratio of axial velocity to blade tip speed are provided.
Date: June 12, 1957
Creator: English, Robert E. & Yohner, Peggy L.
Partner: UNT Libraries Government Documents Department

An analytical investigation of the effects of elevator-fabric distortion on the longitudinal stability and control of an airplane

Description: From Summary: "The results of an analytical investigation to determine the qualitative effects of elevator-fabric distortion on the stick-force characteristics of an airplane are presented. These results indicate that serious alteration of intended stick-force characteristics can be produced by elevator-fabric distortion."
Date: May 1944
Creator: Mathews, Charles W.
Partner: UNT Libraries Government Documents Department

Factors affecting flow distortions produced by supersonic inlets

Description: Report presenting the typical effects of flow distortions on turbojet-engine performance and how flow distortions can be reduced by reducing the distortion entering the inlet diffuser and by improving the amount of mixing that generally occurs in the subsonic diffuser. Sources of distortion in the supersonic inlet are described and steps are suggested that might be taken to reduce their effects.
Date: February 29, 1956
Creator: Piercy, Thomas G.
Partner: UNT Libraries Government Documents Department

Effect of inlet flow distortion on compressor stall and acceleration characteristics of a J65-B-3 turbojet engine

Description: Report presenting an investigation to determine the effects of inlet flow distortion on the compressor stall and engine acceleration characteristics of a J65-B-3 turbojet engine. A sinusoidal circumferential distortion and two abrupt radial tip flow distortions were introduced at the engine inlet at several altitudes and Mach number 0.8. Results regarding the definition of inlet flow distortions, acceleration limits, compressor pressure ratio at stall, fuel flow for stall, and maximum acceleration rate are provided.
Date: November 18, 1955
Creator: Fenn, David B. & Sivo, Joseph N.
Partner: UNT Libraries Government Documents Department

An investigation of screens for removing distortions in ducted flows at high subsonic speeds

Description: Report presenting an investigation of resistance screens for the purpose of obtaining uniform flow in ducts. The new screen designs consisted of several different screen shapes with the elements set at oblique angles (swept) to the flow. Results regarding a rectangular channel and diffuser investigation are provided.
Date: September 26, 1957
Creator: Wood, Charles C. & Knip, Gerald Jr.
Partner: UNT Libraries Government Documents Department

[Detroit Bank and Trust Company Building (1)]

Description: Photograph of the Detroit Bank and Trust Company building, taken in such a manner as to distort the building's shape and make its top appear larger than the bottom. In this image, the building itself is placed between other, smaller buildings, and cars are driving past it. Photo by: Joe Clark, HBSS. Signed by: Joe Clark, HBSS
Date: 19uu
Creator: Clark, Joe
Location Info:
Partner: UNT Libraries Special Collections

[Detroit Bank and Trust Company Building (2)]

Description: Photograph of the Detroit Bank and Trust Company building, taken in such a manner as to distort the building's shape and make its top appear larger than the bottom. In this image, the building itself is placed between other, smaller buildings, and cars are driving past it. Photo by: Joe Clark, HBSS.
Date: 19uu
Creator: Clark, Joe
Location Info:
Partner: UNT Libraries Special Collections

[Detroit Bank and Trust Company Building]

Description: Photograph of the Detroit Bank and Trust Company building, taken in such a manner as to distort the building's shape and make its top appear larger than the bottom. In this image, the building itself is placed between other, smaller buildings, and cars are driving past it.
Date: 19uu
Creator: Clark, Joe
Partner: UNT Libraries Special Collections

Experimental Investigation of a Method of Wave-Drag Reduction for Combinations Employing Quasicylindrical Bodies and Swept Wings at Supersonic Speeds

Description: "Axisymmetric and nonaxisymmetric body distortions designed by the method of NACA TN 3722 were tested to determine the amount of wave-drag reduction obtainable when applied to swept-wing-body combinations over a Mach number range of 1.39 to 1.97. Two wings of aspect ratios 1.33 and 2.67 were tested on different bodies. Both the axisymmetric and nonaxisymmetric distortions produced drag reductions" (p. 1).
Date: February 19, 1957
Creator: Hickey, Daniel P.
Partner: UNT Libraries Government Documents Department

Experimental Investigation of the Effect of Circumferential Inlet Flow Distortion on the Performance of a Five-Stage Axial-Flow Research Compressor with Transonic Rotors in All Stages

Description: Memorandum presenting an investigation of the performance of a five-stage transonic research compressor with distorted inlet flow. Both overall performance and individual blade-row performance results over a range of compressor speeds and equivalent weight flows were obtained with three circumferential inlet flow-distortion patterns covering annular extents of 60, 120, and 180 degrees. Results regarding compressor-inlet conditions and overall performance and individual blade-row performance are provided.
Date: March 5, 1958
Creator: Robbins, William H. & Glaser, Frederick
Partner: UNT Libraries Government Documents Department

Factors Controlling Air-Inlet Flow Distortions

Description: Memorandum presenting a study of several typical air induction systems for modern aircraft, which indicates that flow distortions of about-pipe-flow magnitudes can be expected at near-optimum inlet-engine matched air-flow conditions and at small angles of attacks. The distortions may be seriously increased by operation at large angles of attack or yaw, or by supercritical operation of the inlets. Boundary-layer bleed, duct overexpansion and contraction, and freely rotating fans appear promising as devices for reducing distortions with little cost in propulsive thrust.
Date: April 6, 1956
Creator: Sterbentz, William H.
Partner: UNT Libraries Government Documents Department

Preliminary investigation of the effects of altitude and inlet-pressure distortions on steady-state and surge fuel flow of the J57-P-1 turbojet engine

Description: Report presenting an investigation to determine the effects of altitude and inlet-pressure distortions on the steady-state and surge characteristics of the J57-P-1 two-spool turbojet engine in the altitude wind tunnel. Steady-state performance and surge fuel flows were obtained with a uniform inlet distribution at a range of altitudes at flight Mach number 0.8.
Date: January 21, 1955
Creator: Lubick, Robert J.; Meyer, William R. & Wallner, Lewis E.
Partner: UNT Libraries Government Documents Department

[Photograph Manipulations]

Description: Two photographs of photographer, Joe Clark. Each photo demonstrates a different body distortion. The photo on the left appears to make Clark more short and stout while the photo on the right portrays him as more tall and slender.
Date: unknown
Creator: Clark, Joe
Partner: UNT Libraries Special Collections

Size-dependent structure of silver nanoparticles under high pressure

Description: Silver noble metal nanoparticles that are<10 nm often possess multiply twinned grains allowing them to adopt shapes and atomic structures not observed in bulk materials. The properties exhibited by particles with multiply twinned polycrystalline structures are often far different from those of single-crystalline particles and from the bulk. I will present experimental evidence that silver nanoparticles<10 nm undergo a reversible structural transformation under hydrostatic pressures up to 10 GPa. Results for nanoparticles in the intermediate size range of 5 to 10 nm suggest a reversible linear pressure-dependent rhombohedral distortion which has not been previously observed in bulk silver. I propose a mechanism for this transitiion that considers the bond-length distribution in idealized multiply twinned icosahedral particles. Results for nanoparticles of 3.9 nm suggest a reversible linear pressure-dependent orthorhombic distortion. This distortion is interpreted in the context of idealized decahedral particles. In addition, given these size-dependent measurements of silver nanoparticle compression with pressure, we have constructed a pressure calibration curve. Encapsulating these silver nanoparticles in hollow metal oxide nanospheres then allows us to measure the pressure inside a nanoshell using x-ray diffraction. We demonstrate the measurement of pressure gradients across nanoshells and show that these nanoshells have maximum resolved shear strengths on the order of 500 MPa to IGPa.
Date: December 31, 2008
Creator: Koski, Kristie Jo
Partner: UNT Libraries Government Documents Department

Progress in studies of Electron-Cloud-Induced Optics Distortions at CESRTA

Description: The Cornell Electron Storage Ring Test Accelerator (CesrTA) program has included extensive measurements of coherent betatron tune shifts for a variety of electron and positron beam energies, bunch population levels, and bunch train configurations. The tune shifts have been shown to result primarily from the interaction of the beam with the space-charge field of the beam-induced lowenergy electron cloud in the vacuum chamber. Comparison to several advanced electron cloud simulation program packages has allowed determination of the sensitivity of these measurements to physical parameters characterizing the synchrotron radiation flux, the production of photoelectrons on the vacuum chamberwall, the beam emittance, lattice optics,and the secondary-electron yield model. We report on progress in understanding the cloud buildup and decay mechanisms in magnetic fields and in field-free regions, addressing quantitatively the precise determination of the physical parameters of the modeling. Validation of these models will serve as essential input in the design of damping rings for future high-energy linear colliders.
Date: May 23, 2010
Creator: Crittenden, J.A.; Calvey, J.R.; Dugan, G.F.; Kreinick, D.L.; Leong, Z.; Livezey, J.A. et al.
Partner: UNT Libraries Government Documents Department

The Crystal and Molecular Structure of 2, 2' bipyridylglycinatochloro Copper (II) Dihydrate

Description: The three-dimensional x-ray structure of 2,2'-bipyridylglycinatochloro copper(II) dihydrate has been fully refined to a final R factor of 0.081. The bipyridyl and glycine ligands are arranged about the central copper atom in a square planar configuration while the chlorine atom is 2.635 angstroms above this plane directly over the copper atom. This unusually long distance is explained by the positioning of a glycine group on the opposite side of the square plane, resulting in a distorted octahedral arrangement. Also, the chlorine atom is linked to three oxygen atoms via hydrogen bonding, thus stabilizing the distorted octahedral complex.
Date: May 1975
Creator: Neitzel, Conrad J.
Partner: UNT Libraries