UNT Libraries Government Documents Department - 28 Matching Results

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Free Radicals In Photosynthetic Systems

Description: The method of detecting unpaired electrons in liquid and solid systems by electron spin resonance is discussed. The significance of the hyperfine structure in electron spin resonance is discussed and the possible use of these structural features of the electron spin resonance spectrum to elucidate the nature of the photoproduced unpaired electrons in photosynthesizing systems is introduced.
Date: October 8, 1958
Creator: Calvin, Melvin, 1911-1997
Item Type: Refine your search to only Report
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Chemical igniters for starting jet fuel - nitric acid rockets

Description: Report presenting experiments in a 200-pound-thrust jet fuel-nitric acid rocket with an axial-flow igniter employing the hypergolic alkyl thiosphosphite-nitric acid system. No combustion instability was observed in the igniter, but many of the main-stage runs exhibited low-frequency oscillations.
Date: October 8, 1957
Creator: Morrell, Gerald & Ladanyi, Dezso J.
Item Type: Refine your search to only Report
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Structural Design and Engine Evaluation of an Air-Cooled Turbine Blade Composed of Corrugation and a Semistrut for Operation at a Tip Speed of 1200 Feet Per Second

Description: Report presenting an investigation of an air-cooled turbine rotor blade consisting of an internal part-span structural strut, corrugated cooling surfaces, and a thin outer shell. The effects on stresses and blade lift of varying strut length, shell thickness, and corrugation dimensions are provided. Testing occurred with the X-40 strut - A-286 shell combination and the S-816 strut - L-605 combination.
Date: October 8, 1957
Creator: Kemp, Richard H.; Meyer, André J., Jr. & Morgan, William C.
Item Type: Refine your search to only Report
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Synthesis and Hydrolysis-Rate Studies of Decaborane Derivatives

Description: Report discussing a series of experiments involving the reaction of water with decaborane and HEF-3, a boron fuel containing ethyldecaborane. The chemical properties of the hydrolysis reaction are described. Two isomers were also prepared to assist with the syntheses, and their melting points, molecular weights, and solubilities in certain solvents are included.
Date: October 8, 1957
Creator: Lucas, D. & Lipschitz, A.
Item Type: Refine your search to only Report
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Synthesis and Hydrolysis-Rate Studies of Decaborane Derivatives

Description: "A series of experiments involving the reaction of water with decaborane and HEF-3, a borane fuel consisting mainly of ethyldecaborane, was performed. The results show that the presence of one alkyl group on the decaborane nucleus inhibits the hydrolysis reaction significantly and that the hydrolysis rate can be increased by using an acidic hydrolysis mixture. Two diiododecaborane isomers were prepared for use as intermediates in proposed dimethyldecaborane syntheses, and their melting points, … more
Date: October 8, 1957
Creator: Lucas, D. & Lipschitz, A.
Item Type: Refine your search to only Report
open access

A theoretical and experimental study of boric oxide deposition on a surface immersed in an exhaust gas stream from a jet-engine combustor, including a method of calculating deposition rates on surfaces

Description: Report presenting the deposition rate of boric oxide from a stream containing submicron particles, which was found experimentally to fit a molecular diffusion equation. Results regarding boundary-layer studies, deposition studies, deposition tests, and turbojet engine performance are provided.
Date: October 8, 1957
Creator: Setze, Paul C.
Item Type: Refine your search to only Report
open access

Analysis of turbojet-engine controls for afterburning starting

Description: From Introduction: "The object of this report is to investigate the effects of after-burner lighting on the engine behavior and control-system requirements of a controlled turbojet engine. In this report, a simulation procedure for the afterburner is developed (based on ref. 3), this afterburner simulation is coordinated with previously developed nonafterburning-engine simulation procedures (ref. 4), and the compensated interacting control systems of references 1 and 2 are used. The results of … more
Date: October 8, 1956
Creator: Phillips, W. E., Jr.
Item Type: Refine your search to only Report
open access

An Investigation of the Release Characteristics of a 1/30 Dynamically Scaled AVCO Booster Vehicle from the Simulated Bomb Bay of the B-52 Airplane : COORD. No. AF-AM-59

Description: Memorandum presenting an investigation conducted in the 27- by 27-inch preflight jet of the release characteristics of a dynamically scaled AVCO booster vehicle, internally carried store model from a scale simulated bomb bay of the B-52 airplane at Mach numbers of 0.64 and 0.93. Simulated altitudes were -11,800 feet and 50,000 feet. Successful releases were obtained at all Mach numbers and simulated altitudes of the test.
Date: October 8, 1956
Creator: Lee, John B.
Item Type: Refine your search to only Report
open access

Performance of Inconel 739 Buckets in J33-9 Turbojet Engine

Description: Investigation of the performance of Inconel 739 (a nickel-base alloy of low critical-element content) buckets in a J33-9 engine showed that Inconel 739 had an engine life at least equivalent if not superior to S-816 buckets operated at 1500 degrees F. Inconel 739 buckets had a small scatter in life and exhibited lower total elongation than S-816. Bucket life was less than that predicted on; the basis of stress-rupture considerations alone. The failure mechanism was probably influenced by fatigu… more
Date: October 8, 1956
Creator: Gyorgak, C. A. & Johnston, J. R.
Item Type: Refine your search to only Report
open access

Technical Information for Application of Differential Pressure Transmitters in Pulse Column Bottom Interface Control Systems

Description: The information in this report is based on experience with a similar unit installed on experimental pule columns in the 321 Building. These installations were made to demonstrate the feasibility of the system. In one case, the installation on the 2A Prototype Column, the differential pressure cell (D/P cell) bottom interface control system was monitored by a capacitance-type instrument. The other installations were made on glass columns and were monitored visually.
Date: October 8, 1956
Creator: Smith, A. E.
Item Type: Refine your search to only Report
open access

Wind Tunnel Investigation at High Subsonic Speeds of Drag at 0 Degrees Angle of Attack of Swept-Wing Fuselage Models With Pylon Mounted and Semisubmerged Missiles

Description: Report discussing testing on two wing-fuselage models with 45 degree sweptback wings and various missile arrangements, one with pylons underneath the wing and one with the missiles semisubmerged in the sides of the fuselage. A comparison of the drag of both types of models was made.
Date: October 8, 1956
Creator: King, Thomas J., Jr.
Item Type: Refine your search to only Report
open access

Analysis of Wind-Tunnel Tests at Low Speeds of a Four-Engine Propeller-Driven Airplane Configuration Having a Wing With 40 Degrees of Sweepback

Description: Report presenting an investigation to determine the effects of operating propellers on the longitudinal characteristics of a four-engine tractor airplane with a 40 degree swept wing with an aspect ratio of 10. Results regarding components of the lift changes due to operating propellers, components of the pitching-moment changes due to operating propellers, effect of configuration changes on the pitching-moment characteristics of the model, stick-fixed longitudinal stability of the model, reduct… more
Date: October 8, 1954
Creator: Edwards, George G. & Buell, Donald A.
Item Type: Refine your search to only Report
open access

Investigation of the NACA 4-(5)(05)-037 six- and eight-blade, dual-rotation propellers at positive and negative thrust at Mach numbers up to 0.90, including some aerodynamic characteristics of the NACA 4-(5)(05)-041 two- and four-blade, single-rotat

Description: Report presenting an investigation to determine the aerodynamic characteristics of the NACA 4-(5)(05)-037 six- and eight-blade, dual-rotation propellers operating at positive and negative thrust at a range of Mach numbers when operating at near static conditions. The propellers were operated in combination with a long spinner and at a variety of blade angles.
Date: October 8, 1954
Creator: Walker, John H. & Reynolds, Robert M.
Item Type: Refine your search to only Report
open access

An analytical study of sideslip angles and vertical-tail loads in rolling pullouts as affected by some characteristics of modern high-speed airplane configurations

Description: From Introduction: "The rolling-pullout maneuver (any maneuver in which rolls occur during high g flight conditions) has been shown to be pertinent to design considerations from the standpoint of the loads produced on a vertical tail (refs. 1 to 3). In order to understand this problem better, the results of an analytical study of effects of large variations of some of the lateral-stability-derivative coefficients on the maximum angle of sideslip at first peak of its oscillation are presented in… more
Date: October 8, 1953
Creator: Stone, Ralph W., Jr.
Item Type: Refine your search to only Report
open access

Elastic Buckling Under Combined Stresses of Flat Plates With Integral Waffle-Like Stiffening

Description: Theory and experiment were compared and found in good agreement for the elastic Buckling under combined stresses of long flat plates with integral waffle-like stiffening in a variety of configurations. For such flat plates, 45deg waffle stiffening was found to be the most effective of the configurations for the proportions considered over the widest range of combinations of compression and shear.
Date: October 8, 1953
Creator: Dow, Norris F.; Levin, L. Ross & Troutman, John L.
Item Type: Refine your search to only Report
open access

Experimental Investigation of Several Water-Injection Configurations for Turbine-Blade Spray Cooling in a Turbojet Engine

Description: Memorandum presenting an investigation of water spray cooling of turbine rotor blades with a representative centrifugal-flow turbojet engine. Water injection from several stationary configurations was investigated in order to determine the most favorable configuration on an overall basis. Results regarding blade temperature distributions, cooling efficiencies of various configurations, rotor blades failures, rotor blade spray patterns, and overall comparison of injection configurations are prov… more
Date: October 8, 1953
Creator: Freche, John C. & McKinnon, Roy A.
Item Type: Refine your search to only Report
open access

Theoretical Calculations of the Stability Derivatives at Supersonic Speeds for a High-Speed Airplane Configuration

Description: "Theoretical calculations of the stability derivatives at supersonic speeds for a high-speed airplane configuration are presented. The range of Mach numbers considered includes those cases for which the wing and tail surfaces have subsonic leading edges, supersonic leading edges, and combinations of the two. The methods of analysis are discussed; these represent detailed consideration of the important effects and contributions of the various airplane components utilizing available theories and … more
Date: October 8, 1953
Creator: Margolis, Kenneth & Bobbitt, Percy J.
Item Type: Refine your search to only Report
open access

Use of Commercial Grade Methane in ASP Counting Instruments

Description: The gas commonly used in the chamber of the Simpson Proportional Alpha Counter (ASP) is the high grade, 99% pure methane. The cost of the gas has often raised the question of finding an adequate substitute and a number of substitutions have been attempted. Commercial methane has been substituted successfully for 99% pure methane and its use is recommended in ASP counters. Neither commercial nor technical methane caused any significant changes in instrument operation.
Date: October 8, 1953
Creator: Rasmussen, M. J.
Item Type: Refine your search to only Report
open access

Welded Closures for Fuel Elements

Description: From abstract: "The inert-gas metal-arc welding process was used to determine weldability studies of various aluminum alloys that are being considered for use as can materials. The solid-phase and induction welding processes were also investigated for making can closures."
Date: October 8, 1953
Creator: Sopher, R. P.; Martin, G. E.; Grable, G. B.; Voldrich, C. B.; Leatherman, A. F. & Todd, F. C.
Item Type: Refine your search to only Report
open access

Analytical Chemistry Division Quarterly Progress Report for Period Ending March 26, 1951

Description: Technical report covering experiments happening on the Analytical Chemistry Division's sites at the Oak Ridge National Laboratory. Includes information on ionic analyses, radio-chemical analyses, spectrochemical analyses, service analyses, inorganic preparations, analytical chemical control of homogeneous reactor solution, optical and electron microscopy, and service analyses for the period ending March 26, 1951. [From Abstract]
Date: October 8, 1951
Creator: Kelley, M. T. & Susano, C. D.
Item Type: Refine your search to only Report
open access

Damping in Roll of Rocket-Powered Test Vehicles Having Swept, Tapered Wings of Low Aspect Ratio

Description: "Flight tests of rocket-powered models have been conducted to determine the damping in roll of a group of swept, tapered wings designed for flight in the transonic speed region. The Mach number range of these tests was from approximately 0.7 to 1.4. The experimental damping in roll for all configurations was less than predicted by linearized theory throughout the Mach umber range of these tests. The only wing in this group that experienced an appreciable transonic lateral trim change was the on… more
Date: October 8, 1951
Creator: Sanders, E. Claude, Jr. & Edmondson, James L.
Item Type: Refine your search to only Report
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