Latest content added for UNT Digital Library Partner: UNT Libraries Government Documents Departmenthttps://digital.library.unt.edu/explore/partners/UNTGD/browse/?sort=creator&fq=untl_decade:1940-19492021-08-10T07:39:14-05:00UNT LibrariesThis is a custom feed for browsing UNT Digital Library Partner: UNT Libraries Government Documents DepartmentGive us lumber for more PT's.2006-06-12T23:12:02-05:00https://digital.library.unt.edu/ark:/67531/metadc334/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc334/"><img alt="Give us lumber for more PT's." title="Give us lumber for more PT's." src="https://digital.library.unt.edu/ark:/67531/metadc334/small/"/></a></p><p>Color image of war ships at sea. In the foreground is a boat with "PT 34" painted on it, shining a light and speeding forward. In the background, a ship is sinking as explosive flames rise from it. Other ships and flames can be seen in the distance on the left.</p>Lift and drag data for 30 pusher-propeller shaft housings on an NACA 65,3-018 airfoil section2011-11-17T17:13:32-06:00https://digital.library.unt.edu/ark:/67531/metadc61406/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc61406/"><img alt="Lift and drag data for 30 pusher-propeller shaft housings on an NACA 65,3-018 airfoil section" title="Lift and drag data for 30 pusher-propeller shaft housings on an NACA 65,3-018 airfoil section" src="https://digital.library.unt.edu/ark:/67531/metadc61406/small/"/></a></p><p>Report presenting tests in the two-dimensional low-turbulence pressure tunnel to study the interference effects of various pusher-propeller shaft-housing combinations on a low-drag airfoil. Thirty different combinations were tested, variations being made in shaft size, shape, angle, and fillet.</p>The Effects of Roughness at High Reynolds Numbers on the Lift and Drag Characteristics of Three Thick Airfoils2011-11-17T17:13:32-06:00https://digital.library.unt.edu/ark:/67531/metadc61334/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc61334/"><img alt="The Effects of Roughness at High Reynolds Numbers on the Lift and Drag Characteristics of Three Thick Airfoils" title="The Effects of Roughness at High Reynolds Numbers on the Lift and Drag Characteristics of Three Thick Airfoils" src="https://digital.library.unt.edu/ark:/67531/metadc61334/small/"/></a></p><p>"In connection with studies of airfoils applicable to large high-speed aircraft, the effects of roughness on three 22-percent-thick airfoils were investigated. The tests were made over a range of Reynolds number from about 6 to 26 x 10(exp 6) for the airfoils smooth and with roughness strips applied to the surfaces. The results indicated that for the roughened models the scale effect was generally favorable" (p. 1).</p>Wind-tunnel investigation of profile drag and lift of an intermediate wing section of the XP-51 airplane with beveled trailing-edge and contour ailerons2011-11-17T17:13:32-06:00https://digital.library.unt.edu/ark:/67531/metadc61449/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc61449/"><img alt="Wind-tunnel investigation of profile drag and lift of an intermediate wing section of the XP-51 airplane with beveled trailing-edge and contour ailerons" title="Wind-tunnel investigation of profile drag and lift of an intermediate wing section of the XP-51 airplane with beveled trailing-edge and contour ailerons" src="https://digital.library.unt.edu/ark:/67531/metadc61449/small/"/></a></p><p>Report presenting the results of flight investigations showing that a beveled trailing-edge aileron gives as low or a lower profile drag than a contour aileron. Section profile drag and lift coefficients with two different types of ailerons were obtained at 3 different Reynolds numbers.</p>Interference effects of longitudinal flat plates on low-drag airfoils2011-11-17T17:13:32-06:00https://digital.library.unt.edu/ark:/67531/metadc61370/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc61370/"><img alt="Interference effects of longitudinal flat plates on low-drag airfoils" title="Interference effects of longitudinal flat plates on low-drag airfoils" src="https://digital.library.unt.edu/ark:/67531/metadc61370/small/"/></a></p><p>Three airfoils were tested with an intersecting flat plate normal to the span as a preliminary study of interference effects on airfoils. Small interference effects were noted on the first two airfoils, while larger effects were noted on the NACA 66,2-422 section, which had previously been shown to be unconservative with respect to separation. Airfoils known to be conservative should be used for inboard sections subject to nacelle and fuselage interference.</p>Lift and Drag Characteristics of a Low-Drag Airfoil With Slotted Flap Submitted by Curtiss-Wright Corporation2011-11-17T17:13:32-06:00https://digital.library.unt.edu/ark:/67531/metadc61359/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc61359/"><img alt="Lift and Drag Characteristics of a Low-Drag Airfoil With Slotted Flap Submitted by Curtiss-Wright Corporation" title="Lift and Drag Characteristics of a Low-Drag Airfoil With Slotted Flap Submitted by Curtiss-Wright Corporation" src="https://digital.library.unt.edu/ark:/67531/metadc61359/small/"/></a></p><p>Report presenting a wooden model equipped with a slotted flap that was tested in the two-dimensional tunnel. It represented a wing section of the Curtiss-Wright P-60A airplane and the NACA 66,2-118 section. Results regarding lift characteristics, drag coefficients, and flap deflection characteristics are provided.</p>Pressure-Distribution Measurements of a Low-Drag Airfoil With Slotted Flap Submitted by Curtiss-Wright Corporation2011-11-17T17:13:32-06:00https://digital.library.unt.edu/ark:/67531/metadc61482/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc61482/"><img alt="Pressure-Distribution Measurements of a Low-Drag Airfoil With Slotted Flap Submitted by Curtiss-Wright Corporation" title="Pressure-Distribution Measurements of a Low-Drag Airfoil With Slotted Flap Submitted by Curtiss-Wright Corporation" src="https://digital.library.unt.edu/ark:/67531/metadc61482/small/"/></a></p><p>"Pressure-distribution measurements were made at the request of the Materiel Division, U.S. Army Air Corps, on a 24-inch-chord wooden model equipped with a slotted flap and submitted by the Curtiss-Wright Corporation. The tests were made in the Langley two-dimensional tunnel at a Reynolds number of about 5,600,000" (p. 1).</p>Pressure-Distribution Measurements of a Model of a Davis Wing Section with Fowler Flap Submitted by Consolidated Aircraft Corporation2011-11-17T17:13:32-06:00https://digital.library.unt.edu/ark:/67531/metadc61480/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc61480/"><img alt="Pressure-Distribution Measurements of a Model of a Davis Wing Section with Fowler Flap Submitted by Consolidated Aircraft Corporation" title="Pressure-Distribution Measurements of a Model of a Davis Wing Section with Fowler Flap Submitted by Consolidated Aircraft Corporation" src="https://digital.library.unt.edu/ark:/67531/metadc61480/small/"/></a></p><p>Wing pressure distribution diagrams for several angles of attack and flap deflections of 0 degrees, 20 degrees, and 40 degrees are presented. The normal force coefficients agree with lift coefficients obtained in previous test of the same model, except for the maximum lifts with flap deflection. Pressure distribution measurements were made at Reynolds Number of about 6,000,000.</p>Pressure-distribution measurements of two airfoil models with Fowler flaps submitted by Consolidated Aircraft Corporation as alternative wing sections of the XB-32 airplane2011-11-17T17:13:32-06:00https://digital.library.unt.edu/ark:/67531/metadc61481/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc61481/"><img alt="Pressure-distribution measurements of two airfoil models with Fowler flaps submitted by Consolidated Aircraft Corporation as alternative wing sections of the XB-32 airplane" title="Pressure-distribution measurements of two airfoil models with Fowler flaps submitted by Consolidated Aircraft Corporation as alternative wing sections of the XB-32 airplane" src="https://digital.library.unt.edu/ark:/67531/metadc61481/small/"/></a></p><p>Report presenting pressure distribution measurements on two 24-inch chord models equipped with Fowler flaps in the two-dimensional low-turbulence pressure tunnel. Results regarding pressure-distribution diagrams and normal-force and moment coefficients are provided.</p>Tests of four models representing intermediate sections of the XB-33 airplane including sections with slotted flap and ailerons2011-11-17T17:13:32-06:00https://digital.library.unt.edu/ark:/67531/metadc61366/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc61366/"><img alt="Tests of four models representing intermediate sections of the XB-33 airplane including sections with slotted flap and ailerons" title="Tests of four models representing intermediate sections of the XB-33 airplane including sections with slotted flap and ailerons" src="https://digital.library.unt.edu/ark:/67531/metadc61366/small/"/></a></p><p>Report presenting testing in the two-dimensional tunnel of four models submitted by the Glenn L. Martin Company as intermediate sections of the wing of the XB-33 airplane. Each airfoil model had different types of flaps or no flaps at all. Results regarding the lift and drag data, lift coefficients, effect of flap positions, aileron effects, drag coefficients, and hinge-moment coefficients are provided.</p>Tests of a Highly Cambered Low-Drag-Airfoil Section with a Lift-Control Flap, Special Report2011-11-17T17:13:32-06:00https://digital.library.unt.edu/ark:/67531/metadc65162/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc65162/"><img alt="Tests of a Highly Cambered Low-Drag-Airfoil Section with a Lift-Control Flap, Special Report" title="Tests of a Highly Cambered Low-Drag-Airfoil Section with a Lift-Control Flap, Special Report" src="https://digital.library.unt.edu/ark:/67531/metadc65162/small/"/></a></p><p>Tests were made in the NACA two-dimensional low turbulence pressure tunnel of a highly cambered low-drag airfoil (NACA 65,3-618) with a plain flap designed for lift control. The results indicate that such a combination offers attractive possibilities for obtaining low profile-drag coefficients over a wide range of lift coefficients without large reductions of critical speed.</p>Lift and Drag Tests of Three Airfoil Models With Fowler Flaps Submitted by Consolidated Aircraft Corporation2011-11-17T17:13:32-06:00https://digital.library.unt.edu/ark:/67531/metadc61358/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc61358/"><img alt="Lift and Drag Tests of Three Airfoil Models With Fowler Flaps Submitted by Consolidated Aircraft Corporation" title="Lift and Drag Tests of Three Airfoil Models With Fowler Flaps Submitted by Consolidated Aircraft Corporation" src="https://digital.library.unt.edu/ark:/67531/metadc61358/small/"/></a></p><p>Report presenting lift and drag tests made in the two-dimensional tunnel of three airfoil models. The models represented intermediate sections on alternative wings of the XB-32 airplane and were equipped with 0.30 Fowler flaps. Results regarding the Davis model, the C.A.C. model, and low-drag model are provided.</p>Summary of Airfoil Data2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc65534/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc65534/"><img alt="Summary of Airfoil Data" title="Summary of Airfoil Data" src="https://digital.library.unt.edu/ark:/67531/metadc65534/small/"/></a></p><p>From Summary: "The historical development of NACA airfoils is briefly reviewed. New data are presented that permit the rapid calculation of the approximate pressure distributions for the older NACA four-digit and five-digit airfoils by the same methods used for the NACA 6-series airfoils. The general methods used to derive the basic thickness forms for NACA 6 and 7-series airfoils together with their corresponding pressure distributions are presented. Detail data necessary for the application of the airfoils to wing design are presented in supplementary figures placed at the end of the paper. The report includes an analysis of the lift, drag, pitching-moment, and critical-speed characteristics of the airfoils, together with a discussion of the effects of surface conditions. Available data on high-lift devices are presented. Problems associated with lateral-control devices, leading-edge air intakes, and interference are briefly discussed, together with aerodynamic problems of application."</p>Tail Buffeting2011-11-17T17:13:32-06:00https://digital.library.unt.edu/ark:/67531/metadc64651/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc64651/"><img alt="Tail Buffeting" title="Tail Buffeting" src="https://digital.library.unt.edu/ark:/67531/metadc64651/small/"/></a></p><p>"An approximate theory of buffeting is here presented, based on the assumption of harmonic disturbing forces. Two cases of buffeting are considered: namely, for a tail angle of attack greater and less than the stalling angle, respectively. On the basis of the tests conducted and the results of foreign investigators, a general analysis is given of the nature of the forced vibrations the possible load limits on the tail, and the methods of elimination of buffeting" (p. 1).</p>Electrodeposition research progress report2015-06-16T07:43:17-05:00https://digital.library.unt.edu/ark:/67531/metadc618509/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc618509/"><img alt="Electrodeposition research progress report" title="Electrodeposition research progress report" src="https://digital.library.unt.edu/ark:/67531/metadc618509/small/"/></a></p><p>This report contains a review of this work conducted by the Electrodeposition Group for the last six months. Pictures and a discussion of the method used to convert production solutions to postum to hydrofluoride acid solutions of postum are given. Attempts to plate postum in an inert atmosphere by remote control have been made. As yet no successful runs have been completed. Standardization of normal calomel electrodes by comparison to silver-silver chloride electrodes and to hydrogen electrodes is described.</p>LIQUID THERMAL DIFFUSION2017-10-15T22:09:52-05:00https://digital.library.unt.edu/ark:/67531/metadc1016849/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc1016849/"><img alt="LIQUID THERMAL DIFFUSION" title="LIQUID THERMAL DIFFUSION" src="https://digital.library.unt.edu/ark:/67531/metadc1016849/small/"/></a></p><p>A revised and expanded version of NNES-DC-1. The liquid thermal diffusion method for the separation of isotopes is described. The discussion includes the experimental aspects of the method, description of equipment, and the theoretical aspects of the process as applied to the design, development, and performance criteria. A short history of the liquid thermal diffusion method from 1940 to 1945 is preserted along; with a survey of relevant literature prior to 1940. The remainder of the report is concerned with theoretical aspects. (J.R.D.)</p>The Theory of a Free Jet of a Compressible Gas2011-11-17T17:13:32-06:00https://digital.library.unt.edu/ark:/67531/metadc64427/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc64427/"><img alt="The Theory of a Free Jet of a Compressible Gas" title="The Theory of a Free Jet of a Compressible Gas" src="https://digital.library.unt.edu/ark:/67531/metadc64427/small/"/></a></p><p>"In the present report the theory of free turbulence propagation and the boundary layer theory are developed for a plane-parallel free stream of a compressible fluid. In constructing the theory use was made of the turbulence hypothesis by Taylor (transport of vorticity) which gives best agreement with test results for problems involving heat transfer in free jets" (p. 1).</p>Metabolism and Distribution of Inhaled Plutonium in Rats2019-08-27T15:53:11-05:00https://digital.library.unt.edu/ark:/67531/metadc1201823/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc1201823/"><img alt="Metabolism and Distribution of Inhaled Plutonium in Rats" title="Metabolism and Distribution of Inhaled Plutonium in Rats" src="https://digital.library.unt.edu/ark:/67531/metadc1201823/small/"/></a></p><p>From abstract: "Several different techniques were used to introduce tracer quantities of plutonium into the lungs of rats. When aerosols were produced by atomizing aqueous solutions of the nitrates it was found that approximately 20 per cent of the dose was absorbed and deposited in the skelton [sic] with tetra-, hexa-, and trivalent plutonium. Thus with these compounds, the lungs represent a more dangerous portal of entry than either oral (0.05 per cent) or intramuscular (13 per cent) administration. Tetravalent Pu was eliminated most slowly from the lung, the average half-time during the first month being 15 days. But when citrate was added to complex the Pu, over 70 per cent was eliminated within 1 day. This was accompanied by a deposition of over 30 per cent in the skelton [sic] and over 20 per cent in the liver. Presumably citrate breaks up the insoluble colloid in which Pu exists in the lungs. Complexing with cupferron which, unlike citrate, produces a "fat soluble" compound, greatly diminished the extent of absorption from the lungs. Plutonium oxide smokes which were produced at high temperatures were eliminated more slowly from the lungs (average half time of 30 days during the first month) and were deposited in the skeleton to a much lesser extent (6.2 per cent) than was the case with the nitrates."</p>Quality of Columbia River water2018-11-28T14:33:49-06:00https://digital.library.unt.edu/ark:/67531/metadc1340893/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc1340893/"><img alt="Quality of Columbia River water" title="Quality of Columbia River water" src="https://digital.library.unt.edu/ark:/67531/metadc1340893/small/"/></a></p><p>This report is a memorandum sent on January 27, 1943 concerning the quality of the water of Columbia River. Topics included: ph value, water temperatures, hardness, and dissolved carbon dioxide contents.</p>Fission product studies with plant dissolver solutions: IX-Iodine, X-Arsenic. SE-PC No. 612018-11-03T11:47:27-05:00https://digital.library.unt.edu/ark:/67531/metadc1313020/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc1313020/"><img alt="Fission product studies with plant dissolver solutions: IX-Iodine, X-Arsenic. SE-PC No. 61" title="Fission product studies with plant dissolver solutions: IX-Iodine, X-Arsenic. SE-PC No. 61" src="https://digital.library.unt.edu/ark:/67531/metadc1313020/small/"/></a></p><p>In continuing studies to characterize and identify fission product activities formed in the piles and appearing in plant dissolver solutions work was done to determine whether or not long-lived isotopes of certain elements were present. Two of the elements in this category were iodine and arsenic. The iodine isotope of particular interest was I{sup 129}. Its tellurium parent has been identified but no daughter activity attributable to iodine has been observed. The arsenic activities of interest were the long-lived isotopes (16 days and 90 days) which have been produced artificially by several different nuclear reactions.</p>Natural Icing of an Axial-Flow Turbojet Engine in Flight for a Single Icing Condition2011-11-11T19:22:00-06:00https://digital.library.unt.edu/ark:/67531/metadc53462/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc53462/"><img alt="Natural Icing of an Axial-Flow Turbojet Engine in Flight for a Single Icing Condition" title="Natural Icing of an Axial-Flow Turbojet Engine in Flight for a Single Icing Condition" src="https://digital.library.unt.edu/ark:/67531/metadc53462/small/"/></a></p><p>Memorandum presenting an investigation in natural icing conditions to determine the effect of ice formations on the performance of an axial-flow turbojet engine. A description of the change over time in tail-pipe temperature, engine jet thrust, fuel flow, ice collection, and acceleration qualities are provided.</p>Preliminary Results of Natural Icing of an Axial-Flow Turbojet Engine2011-11-11T19:22:00-06:00https://digital.library.unt.edu/ark:/67531/metadc53464/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc53464/"><img alt="Preliminary Results of Natural Icing of an Axial-Flow Turbojet Engine" title="Preliminary Results of Natural Icing of an Axial-Flow Turbojet Engine" src="https://digital.library.unt.edu/ark:/67531/metadc53464/small/"/></a></p><p>Memorandum presenting a flight investigation in natural icing conditions to determine the effect of ice formations on the performance of an axial-flow turbojet engine. Tail-pipe temperature increased from 761 to 1065 degrees Fahrenheit and the jet thrust decreased from 1234 to 910 pounds during a period of 45 minutes in icing. No general conclusions can be reached from the data because the icing condition was relatively light.</p>Preliminary results of natural icing of an axial-flow turbojet engine2011-11-17T22:13:23-06:00https://digital.library.unt.edu/ark:/67531/metadc57582/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc57582/"><img alt="Preliminary results of natural icing of an axial-flow turbojet engine" title="Preliminary results of natural icing of an axial-flow turbojet engine" src="https://digital.library.unt.edu/ark:/67531/metadc57582/small/"/></a></p><p>Report presenting a flight investigation in natural icing conditions to determine the effect of ice formations on the performance of an axial-flow turbojet engine. Results regarding the tail-pipe temperature, engine jet thrust, and characteristics of ice formation are provided. No general conclusions can be reached from the data because the icing condition was relatively light.</p>Comparison of flight performance of AN-F-58 and AN-F-32 fuels in J35 turbojet engine2011-11-16T07:33:14-06:00https://digital.library.unt.edu/ark:/67531/metadc57982/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc57982/"><img alt="Comparison of flight performance of AN-F-58 and AN-F-32 fuels in J35 turbojet engine" title="Comparison of flight performance of AN-F-58 and AN-F-32 fuels in J35 turbojet engine" src="https://digital.library.unt.edu/ark:/67531/metadc57982/small/"/></a></p><p>Report presenting a flight investigation to determine the comparative performance of AN-F-58 and AN-F-32 fuels in a 4000-pound-thrust turbojet engine. The fuels were equivalent over the range of conditions investigated. Results regarding corrected net thrust, corrected jet-fuel consumption, variation of corrected tail-pipe temperature, combustor blow-out speeds, and visual observations of the jet exhaust are provided.</p>Flight Comparison of Performance and Cooling Characteristics of Exhaust-Ejector Installation with Exhaust-Collector-Ring Installation2011-11-17T17:13:32-06:00https://digital.library.unt.edu/ark:/67531/metadc63773/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc63773/"><img alt="Flight Comparison of Performance and Cooling Characteristics of Exhaust-Ejector Installation with Exhaust-Collector-Ring Installation" title="Flight Comparison of Performance and Cooling Characteristics of Exhaust-Ejector Installation with Exhaust-Collector-Ring Installation" src="https://digital.library.unt.edu/ark:/67531/metadc63773/small/"/></a></p><p>Flight and ground investigations have been made to compare an exhaust-ejector installation with a standard exhaust-collector-ring installation on air-cooled aircraft engines in a twin-engine airplane. The ground investigation allowed that, whereas the standard engine would have overheated above 600 horsepower, the engine with exhaust ejectors cooled at take-off operating conditions at zero ram. The exhaust ejectors provided as much cooling with cowl flaps closed as the conventional cowl flaps induced when full open at low airspeeds. The propulsive thrust of the exhaust-ejector installation was calculated to be slightly less than the thrust of the collector-ring-installation.</p>Experimental and Theoretical Investigations of Cavitation in Water2011-11-17T17:13:32-06:00https://digital.library.unt.edu/ark:/67531/metadc64497/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc64497/"><img alt="Experimental and Theoretical Investigations of Cavitation in Water" title="Experimental and Theoretical Investigations of Cavitation in Water" src="https://digital.library.unt.edu/ark:/67531/metadc64497/small/"/></a></p><p>"The cavitation in nozzles on airfoils of various shape and on a sphere are experimentally investigated. The limits of cavitation and the extension of the zone of the bubbles in different stages of cavitation are photographically established. The pressure in the bubble area is constant and very low, jumping to high values at the end of the area. The analogy with the gas compression shock is adduced and discussed" (p. 1).</p>Present and future problems of airplane propulsion2011-11-17T17:13:32-06:00https://digital.library.unt.edu/ark:/67531/metadc63144/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc63144/"><img alt="Present and future problems of airplane propulsion" title="Present and future problems of airplane propulsion" src="https://digital.library.unt.edu/ark:/67531/metadc63144/small/"/></a></p><p>Some of the problems considered in this report include: thermodynamics of surface friction, application of thick wing sections, special applications of controllable propellers, and gas turbines for aircraft.</p>Aerodynamic Heat-Power Engine Operating on a Closed Cycle2011-11-17T17:13:32-06:00https://digital.library.unt.edu/ark:/67531/metadc63985/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc63985/"><img alt="Aerodynamic Heat-Power Engine Operating on a Closed Cycle" title="Aerodynamic Heat-Power Engine Operating on a Closed Cycle" src="https://digital.library.unt.edu/ark:/67531/metadc63985/small/"/></a></p><p>"Hot-air engines with dynamic compressors and turbines offer new prospects of success through utilization of units of high efficiencies and through the employment of modern materials of great strength at high temperature. Particular consideration is given to an aerodynamic prime mover operating on a closed circuit and heated externally. Increase of the pressure level of the circulating air permits a great increase of limit load of the unit. This also affords a possibility of regulation for which the internal efficiency of the unit changes but slightly. The effect of pressure and temperature losses is investigated" (p. 1).</p>Investigations of Compression Shocks and Boundary Layers in Gases Moving at High Speed2011-11-17T17:13:32-06:00https://digital.library.unt.edu/ark:/67531/metadc63820/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc63820/"><img alt="Investigations of Compression Shocks and Boundary Layers in Gases Moving at High Speed" title="Investigations of Compression Shocks and Boundary Layers in Gases Moving at High Speed" src="https://digital.library.unt.edu/ark:/67531/metadc63820/small/"/></a></p><p>The mutual influences of compression shocks and friction boundary layers were investigated by means of high speed wind tunnels.Schlieren optics provided a clear picture of the flow phenomena and were used for determining the location of the compression shocks, measurement of shock angles, and also for Mach angles. Pressure measurement and humidity measurements were also taken into consideration.Results along with a mathematical model are described.</p>Recovery of Uranium From Fiberglass Air Filters2018-02-12T07:42:45-06:00https://digital.library.unt.edu/ark:/67531/metadc173242/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc173242/"><img alt="Recovery of Uranium From Fiberglass Air Filters" title="Recovery of Uranium From Fiberglass Air Filters" src="https://digital.library.unt.edu/ark:/67531/metadc173242/small/"/></a></p><p>Abstract: Various procedures for extracting uranium from fiberglass air filters have been tested and compared. Satisfactory results which involve the least amount of handling are obtained by simply washing the material with hot 1:1 hydrochloric acid.</p>Separation of Tuballoy From Tantalum by Chlorination Distillation Process2018-02-12T07:42:45-06:00https://digital.library.unt.edu/ark:/67531/metadc173154/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc173154/"><img alt="Separation of Tuballoy From Tantalum by Chlorination Distillation Process" title="Separation of Tuballoy From Tantalum by Chlorination Distillation Process" src="https://digital.library.unt.edu/ark:/67531/metadc173154/small/"/></a></p><p>Abstract: Tuballoy can be effectively separated from tantalum filaments by chlorination of the filaments and subsequent distillation and condensation of tantalum chloride. Apparatus for chlorination of filaments and distillation separation in one unit is under consideration. Chemical methods of separation of tuballoy from distillation residues are being tested.</p>Sweeping of Fission Gases from Solutions of U and Plutonium2021-08-10T07:39:14-05:00https://digital.library.unt.edu/ark:/67531/metadc1256407/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc1256407/"><img alt="Sweeping of Fission Gases from Solutions of U and Plutonium" title="Sweeping of Fission Gases from Solutions of U and Plutonium" src="https://digital.library.unt.edu/ark:/67531/metadc1256407/small/"/></a></p><p>Technical report describing two experiments performed to compare the amounts of fission gases swept out of UNH solution with those amounts swept out of PU solution under idential condiditons. The charge wire technique was used. The essential date and the results are given in tables in the report.</p>Flight Investigation of the Effect of a Local Change in Wing Contour on Chordwise Pressure Distribution at High Speeds2011-11-14T22:28:08-06:00https://digital.library.unt.edu/ark:/67531/metadc55098/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc55098/"><img alt="Flight Investigation of the Effect of a Local Change in Wing Contour on Chordwise Pressure Distribution at High Speeds" title="Flight Investigation of the Effect of a Local Change in Wing Contour on Chordwise Pressure Distribution at High Speeds" src="https://digital.library.unt.edu/ark:/67531/metadc55098/small/"/></a></p><p>Report presenting testing in high-speed flight with a fighter airplane to determine the effect of chordwise pressure distribution resulting from a minor modification in the contour of the wing upper surface. A faired bulge was added to the contour and chordwise pressure distributions were obtained on the original and modified contours.</p>Tests of a Horizontal-Tail Model through the Transonic Speed Range by the NACA Wing-Flow Method2011-11-17T17:13:32-06:00https://digital.library.unt.edu/ark:/67531/metadc63801/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc63801/"><img alt="Tests of a Horizontal-Tail Model through the Transonic Speed Range by the NACA Wing-Flow Method" title="Tests of a Horizontal-Tail Model through the Transonic Speed Range by the NACA Wing-Flow Method" src="https://digital.library.unt.edu/ark:/67531/metadc63801/small/"/></a></p><p>"A 1/12-scale model of a horizontal tail of a fighter airplane was tested through the transonic speeds in the high-speed flow over an airplane wing, the surface of which served as a reflection plane for the model. Measurements of lift, elevator-hinge moment, angle of attack, and elevator angle were made in the Mach number range from 0.75 to 1.04 for elevator deflections ranging from 10 degrees to minus 10 degrees, and for angles of attack of minus 1.2 degrees, 0.4 degrees, and 3.4 degrees. The equipment used to measure the hinge moments of the model proved to be unsatisfactory, and for this reason the hinge-moment data are considered to be only qualitative" (p. 1).</p>Coal-Mine Accidents in the United States, 19422010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12622/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12622/"><img alt="Coal-Mine Accidents in the United States, 1942" title="Coal-Mine Accidents in the United States, 1942" src="https://digital.library.unt.edu/ark:/67531/metadc12622/small/"/></a></p><p>Report compiled by the U.S. Bureau of Mines including statistics on fatal and non-fatal accidents in coal mines located in the United States as well as data regarding the various operations (e.g., number of miners employed and average production). The information is organized into tables for comparison and the text draws some overall conclusions in the summary.</p>Metal- and Nonmetal-Mine Accidents in the United States During the Calendar Year 1941 (Excluding Coal Mines)2010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12617/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12617/"><img alt="Metal- and Nonmetal-Mine Accidents in the United States During the Calendar Year 1941 (Excluding Coal Mines)" title="Metal- and Nonmetal-Mine Accidents in the United States During the Calendar Year 1941 (Excluding Coal Mines)" src="https://digital.library.unt.edu/ark:/67531/metadc12617/small/"/></a></p><p>Report published by the U.S. Bureau of Mines regarding accidents at mines located in the United States for all operations except coal mines. The report includes statistics about the number and kinds of accidents as well as information about the mining operations (i.e., number of persons employed, average amount of work performed per person, etc.).</p>Metal- and Nonmetal-Mine Accidents in the United States During the Calendar Year 1940 (Excluding Coal Mines)2010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12610/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12610/"><img alt="Metal- and Nonmetal-Mine Accidents in the United States During the Calendar Year 1940 (Excluding Coal Mines)" title="Metal- and Nonmetal-Mine Accidents in the United States During the Calendar Year 1940 (Excluding Coal Mines)" src="https://digital.library.unt.edu/ark:/67531/metadc12610/small/"/></a></p><p>Report published by the U.S. Bureau of Mines regarding accidents at mines located in the United States for all operations except coal mines. The report includes statistics about the number and kinds of accidents as well as information about the mining operations (i.e., number of persons employed, average amount of work performed per person, etc.).</p>Coal-Mine Accidents in the United States, 19382010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12597/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12597/"><img alt="Coal-Mine Accidents in the United States, 1938" title="Coal-Mine Accidents in the United States, 1938" src="https://digital.library.unt.edu/ark:/67531/metadc12597/small/"/></a></p><p>Report compiled by the U.S. Bureau of Mines including statistics on fatal and non-fatal accidents in coal mines located in the United States as well as data regarding the various operations (e.g., number of miners employed and average production). The information is organized into tables for comparison and the text draws some overall conclusions in the summary.</p>The Production of Leukopenia by Chronic Irradiation of the Abdominal Viscera of the Cat2018-02-12T07:42:45-06:00https://digital.library.unt.edu/ark:/67531/metadc101133/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc101133/"><img alt="The Production of Leukopenia by Chronic Irradiation of the Abdominal Viscera of the Cat" title="The Production of Leukopenia by Chronic Irradiation of the Abdominal Viscera of the Cat" src="https://digital.library.unt.edu/ark:/67531/metadc101133/small/"/></a></p><p>This report describes an experiment that produced leukopenia in cats through irradiation. It elaborates that irradiated cats had significant decreases in levels of leukocytes, polymorphonuclear leukocytes, and lymphocytes. The methods and specific results of the experiment are also given and discussed.</p>Coal-Mine Accidents in the United States, 19412010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12616/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12616/"><img alt="Coal-Mine Accidents in the United States, 1941" title="Coal-Mine Accidents in the United States, 1941" src="https://digital.library.unt.edu/ark:/67531/metadc12616/small/"/></a></p><p>Report compiled by the U.S. Bureau of Mines including statistics on fatal and non-fatal accidents in coal mines located in the United States as well as data regarding the various operations (e.g., number of miners employed and average production). The information is organized into tables for comparison and the text draws some overall conclusions in the summary.</p>Metal- and Nonmetal-Mine Accidents in the United States During the Calendar Year 1942 (Excluding Coal Mines)2010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12621/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12621/"><img alt="Metal- and Nonmetal-Mine Accidents in the United States During the Calendar Year 1942 (Excluding Coal Mines)" title="Metal- and Nonmetal-Mine Accidents in the United States During the Calendar Year 1942 (Excluding Coal Mines)" src="https://digital.library.unt.edu/ark:/67531/metadc12621/small/"/></a></p><p>Report published by the U.S. Bureau of Mines regarding accidents at mines located in the United States for all operations except coal mines. The report includes statistics about the number and kinds of accidents as well as information about the mining operations (i.e., number of persons employed, average amount of work performed per person, etc.).</p>Metal- and Nonmetal-Mine Accidents in the United States During the Calendar Year 1939 (Excluding Coal Mines)2010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12600/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12600/"><img alt="Metal- and Nonmetal-Mine Accidents in the United States During the Calendar Year 1939 (Excluding Coal Mines)" title="Metal- and Nonmetal-Mine Accidents in the United States During the Calendar Year 1939 (Excluding Coal Mines)" src="https://digital.library.unt.edu/ark:/67531/metadc12600/small/"/></a></p><p>Report published by the U.S. Bureau of Mines regarding accidents at mines located in the United States for all operations except coal mines. The report includes statistics about the number and kinds of accidents as well as information about the mining operations (i.e., number of persons employed, average amount of work performed per person, etc.).</p>Metal-Mine Accidents in the United States During the Calendar Year 19382010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12595/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12595/"><img alt="Metal-Mine Accidents in the United States During the Calendar Year 1938" title="Metal-Mine Accidents in the United States During the Calendar Year 1938" src="https://digital.library.unt.edu/ark:/67531/metadc12595/small/"/></a></p><p>Report issued by the U.S. Bureau of Mines covering accidents that happened in metal mines located in the United States including statistics for injuries, fatalities, kinds and causes of accidents, and operational data, such as number of mine workers and shifts worked.</p>Quarry Accidents in the United States During the Calendar Year 19382010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12592/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12592/"><img alt="Quarry Accidents in the United States During the Calendar Year 1938" title="Quarry Accidents in the United States During the Calendar Year 1938" src="https://digital.library.unt.edu/ark:/67531/metadc12592/small/"/></a></p><p>Report published by the U.S. Bureau of Mines which is a compilation of accidents in quarries located in the United States with data regarding the number and kinds of accidents as well as information about the mining operations (e.g., number of men employed, kinds of quarries, amount of work performed, etc.).</p>Quarry Accidents in the United States During the Calendar Year 19392010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12598/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12598/"><img alt="Quarry Accidents in the United States During the Calendar Year 1939" title="Quarry Accidents in the United States During the Calendar Year 1939" src="https://digital.library.unt.edu/ark:/67531/metadc12598/small/"/></a></p><p>Report published by the U.S. Bureau of Mines which is a compilation of accidents in quarries located in the United States with data regarding the number and kinds of accidents as well as information about the mining operations (e.g., number of men employed, kinds of quarries, amount of work performed, etc.).</p>Quarry Accidents in the United States During the Calendar Year 19402010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12607/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12607/"><img alt="Quarry Accidents in the United States During the Calendar Year 1940" title="Quarry Accidents in the United States During the Calendar Year 1940" src="https://digital.library.unt.edu/ark:/67531/metadc12607/small/"/></a></p><p>Report published by the U.S. Bureau of Mines which is a compilation of accidents in quarries located in the United States with data regarding the number and kinds of accidents as well as information about the mining operations (e.g., number of men employed, kinds of quarries, amount of work performed, etc.).</p>Quarry Accidents in the United States During the Calendar Year 19412010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12612/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12612/"><img alt="Quarry Accidents in the United States During the Calendar Year 1941" title="Quarry Accidents in the United States During the Calendar Year 1941" src="https://digital.library.unt.edu/ark:/67531/metadc12612/small/"/></a></p><p>Report published by the U.S. Bureau of Mines which is a compilation of accidents in quarries located in the United States with data regarding the number and kinds of accidents as well as information about the mining operations (e.g., number of men employed, kinds of quarries, amount of work performed, etc.).</p>Quarry Accidents in the United States During the Calendar Year 19422010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12618/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12618/"><img alt="Quarry Accidents in the United States During the Calendar Year 1942" title="Quarry Accidents in the United States During the Calendar Year 1942" src="https://digital.library.unt.edu/ark:/67531/metadc12618/small/"/></a></p><p>Report published by the U.S. Bureau of Mines which is a compilation of accidents in quarries located in the United States with data regarding the number and kinds of accidents as well as information about the mining operations (e.g., number of men employed, kinds of quarries, amount of work performed, etc.).</p>Coal-Mine Accidents in the United States, 19372010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12590/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12590/"><img alt="Coal-Mine Accidents in the United States, 1937" title="Coal-Mine Accidents in the United States, 1937" src="https://digital.library.unt.edu/ark:/67531/metadc12590/small/"/></a></p><p>Report compiled by the U.S. Bureau of Mines including statistics on fatal and non-fatal accidents in coal mines located in the United States as well as data regarding the various operations (e.g., number of miners employed and average production). The information is organized into tables for comparison and the text draws some overall conclusions in the summary.</p>Coal-Mine Accidents in the United States, 19392010-02-21T23:09:24-06:00https://digital.library.unt.edu/ark:/67531/metadc12604/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc12604/"><img alt="Coal-Mine Accidents in the United States, 1939" title="Coal-Mine Accidents in the United States, 1939" src="https://digital.library.unt.edu/ark:/67531/metadc12604/small/"/></a></p><p>Report compiled by the U.S. Bureau of Mines including statistics on fatal and non-fatal accidents in coal mines located in the United States as well as data regarding the various operations (e.g., number of miners employed and average production). The information is organized into tables for comparison and the text draws some overall conclusions in the summary.</p>