Collection
Texas Attorney General Opinions
575
Technical Report Archive and Image Library
528
National Advisory Committee for Aeronautics Collection
356
TRAIL Microcard Collection
120
Office of Scientific & Technical Information Technical Reports
118
Texas State Publications
33
USGS Topographic Map Collection
33
World War Two Collection
25
World War Two Newsmaps
19
Government Documents A to Z Digitization Project
12
6 More
Serial/Series Title
NACA Technical Notes
148
Atomic Energy Commission Reports
143
NACA Wartime Reports
95
NACA Research Memorandums
54
NACA Memorandum Reports
44
MDDC (Series)
43
NACA Technical Reports
36
NACA Advanced Restricted Reports
28
NACA Advanced Confidential Reports
20
15 Minute Series (Topographic)
19
46 More
Country
States
1,327 Matching Results
Results open in a new window/tab.
Results:
1 - 24 of
1,327
next
LIQUID THERMAL DIFFUSION
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.)
Date:
September 10, 1946
Creator:
Abelson, P.H.; Rosen, N. & Hoover, J.I. eds.
Object Type:
Report
System:
The UNT Digital Library
Metabolism and Distribution of Inhaled Plutonium in Rats
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 …
Date:
October 29, 1946
Creator:
Abrams, Richard; Siebert, H. C.; Potts, A. M.; Forker, L. L.; Greenberg, D.; Postel, A. et al.
Object Type:
Report
System:
The UNT Digital Library
Fission product studies with plant dissolver solutions: IX-Iodine, X-Arsenic. SE-PC No. 61
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.
Date:
January 8, 1946
Creator:
Acken, M. F.; Sullivan, W. H. & Leader, G. R.
Object Type:
Report
System:
The UNT Digital Library
Recovery of Uranium From Fiberglass Air Filters
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.
Date:
August 5, 1946
Creator:
Adams, R. H.; Rogers, J. A. & Brown, K. B.
Object Type:
Report
System:
The UNT Digital Library
Separation of Tuballoy From Tantalum by Chlorination Distillation Process
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.
Date:
February 6, 1946
Creator:
Adams, R. H.; Rogers, J. A.; Wagner, E. L. & Miller, A. J.
Object Type:
Report
System:
The UNT Digital Library
Flight Investigation of the Effect of a Local Change in Wing Contour on Chordwise Pressure Distribution at High Speeds
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.
Date:
September 1946
Creator:
Adams, Richard E. & Silsby, Norman S.
Object Type:
Report
System:
The UNT Digital Library
Variation with Mach Number of Static and Total Pressures Through Various Screens
"Tests were conducted in the Langley 24-inch highspeed tunnel to ascertain the static-pressure and total-pressure losses through screens ranging in mesh from 3 to 12 wires per inch and in wire diameter from 0.023 to 0.041 inch. Data were obtained from a Mach number of approximately 0.20 up to the maximum (choking) Mach number obtainable for each screen. The results of this investigation indicate that the pressure losses increase with increasing Mach number until the choking Mach number, which can be computed, is reached" (p. 1).
Date:
February 1946
Creator:
Adler, Alfred A.
Object Type:
Report
System:
The UNT Digital Library
Standard Nomenclature for Airspeeds With Tables and Charts for Use in Calculation of Airspeed
Note presenting symbols and definitions of various airspeed terms that have been adopted as standard by the NACA Subcommittee on Aircraft Structural Design. the equations, charts, and tables required in the evaluation of true airspeed, calibrated airspeed, equivalent airspeed, impact and dynamic pressures, and Mach and Reynolds numbers have been compiled.
Date:
September 1946
Creator:
Aiken, William S., Jr.
Object Type:
Report
System:
The UNT Digital Library
Standard nomenclature for airspeeds with tables and charts for use in calculation of airspeed
Symbols and definition of various airspeed terms that have been adopted as standard by the NACA subcommittee on aircraft structural design are presented. The equations, charts, and tables required in the evaluation of true airspeed, calibrated airspeed, equivalent airspeed, impact and dynamic pressures, and Mach and Reynolds numbers have been compiled. Tables of the standard atmosphere to an altitude of 65,000 feet and a tentative extension to an altitude of 100,000 feet are given along with the basic equations and constants on which both the standard atmosphere and the tentative extension are based.
Date:
July 17, 1946
Creator:
Aiken, William S., Jr.
Object Type:
Report
System:
The UNT Digital Library
What Peace Can Mean to American Farmers: Expansion of Foreign Trade.
Describes the changes the agricultural market faces post-World War II, and how the growth of foreign trade will affect farmers.
Date:
October 1946
Creator:
Allin, Bushrod Warren; Elliott, F. F. (Foster Floyd), 1895-1972 & Stine, O. C. (Oscar Clemen), 1884-1974
Object Type:
Book
System:
The UNT Digital Library
A Correlation of the Effects of Compression Ratio and Inlet-Air Temperature on the Knock Limits of Aviation Fuels in a CFR Engine 2
Report presenting the knock-limited performance of nine fuels comprising isolated members of four classes of hydrocarbons in the form of three-dimensional plots of fuel-air ratio, compression temperature, and compression-air density.
Date:
June 1946
Creator:
Alquist, Henry E.; O'Dell, Leon & Evvard, John C.
Object Type:
Report
System:
The UNT Digital Library
Influence of Total Surface Beta Irradiation on the Gross Metabolic Pattern of Rats
The following report records the study of albino rats subjected to beta rays and analyzes the skin reactions and metabolic patterns.
Date:
July 30, 1946
Creator:
Anderson, Elizabeth
Object Type:
Report
System:
The UNT Digital Library
High-Speed Wind-Tunnel Tests of a Twin-Fuselage Pursuit Airplane
Report discussing the aerodynamic characteristics of a twin-fuselage pursuit airplane model, especially at high speeds. Information about the force data and critical Mach numbers for parts of the model is provided. Suggestions for increasing the Mach number of divergence by making modifications to the wing-fuselage fillets and external shape of the radiator are also included.
Date:
April 24, 1946
Creator:
Anderson, Joseph L. & Tkac, Victor B.
Object Type:
Report
System:
The UNT Digital Library
Effects of Tip Dihedral on Lateral Stability and Control Characteristics as Determined by Tests of a Dynamic Wind Model in the Langley Free-Flight Tunnel
Note presenting an investigation of the effects of tip dihedral on lateral stability and control characteristics by flight tests of models in the free-flight tunnel. The results indicate that at high lift coefficients, tip dihedral may cause a lightly damped lateral oscillation, which does not occur with full-span dihedral at similar values of effective dihedral and directional stability.
Date:
July 1946
Creator:
Ankenbruck, Herman O.
Object Type:
Report
System:
The UNT Digital Library
RADON MEASUREMENTS IN WAREHOUSE AND BOX CARS CONTAINING HIGH GRADE ORE
None
Date:
February 11, 1946
Creator:
Anonsen, S.H.
Object Type:
Report
System:
The UNT Digital Library
RADIOCARBON FROM PILE GRAPHITE CHEMICAL METHODS FOR ITS CONCENTRATIONS
Samples of pile graphite, irradiated in a test-hole at Hanford for 15 months, have been assayed for radioactive C{sup14}, yielding 0.38 ± 0.04 microcuries per gram. At this level of activity, the pile graphite contains very valuable amounts of C{sup14}. The relation between the above assay and the probable average assay of pile graphite is discussed, and it is concluded that the latter is almost certainly above 0.3 uc/ gram. Controlled oxidation of this graphite, either with oxygen at ~ 750°C, or with chromic acid "cleaning solution" at room temperature, yields early fractions which are highly enriched in C{sup14}. Concentrations of 5-fold with oxygen, and 50-fold with CRO{sub3}, have been observed. The relation between the observed enrichment and the Wigner effect is discussed, and a mechanism accounting for the observations put forward. According to this, about 25% of the stable carbon atoms in the lattice have been displaced by Wigner effect, a large fraction of which have healed the migrating to crystal edges. All the C{sup14} atoms have been displaced, and the same fraction of these migrate to the edges. The enrichment then results from surface oxidation, in the oxygen case. Predictions are made on the basis of this hypothesis. …
Date:
October 10, 1946
Creator:
Arnold, J. R. & Libby, W. F.
Object Type:
Report
System:
The UNT Digital Library
Radiocarbon from Pile Graphite; Chemical Methods for its Concentration
Abstract. Samples of pile graphite, irradiated in a test-hole at Hanford for 15 months, have been assayed for radioactive C14, yielding 0.38 ± 0.04 microcuries per gram. At this level of activity, the pile graphite contains very valuable amounts of C14. The relation between the above assay and the probable average assay of pile graphite is discussed, and it is concluded that the latter is almost certainly above 0.3 uc/ gram. Controlled oxidation of this graphite, either with oxygen at ~ 750°C, or with chromic acid "cleaning solution" at room temperature, yields early fractions which are highly enriched in C14. Concentrations of 5-fold with oxygen, and 50-fold with CRO{sub3}, have been observed. The relation between the observed enrichment and the Wigner effect is discussed, and a mechanism accounting for the observations put forward. According to this, about 25% of the stable carbon atoms in the lattice have been displaced by Wigner effect, a large fraction of which have healed the migrating to crystal edges. All the C14 atoms have been displaced, and the same fraction of these migrate to the edges. The enrichment then results from surface oxidation, in the oxygen case. Predictions are made on the basis of this …
Date:
October 10, 1946
Creator:
Arnold, James R. & Libby, Willard F.
Object Type:
Report
System:
The UNT Digital Library
Flood-Prevention Projects at Pennsylvania Anthracite Mines: A Preliminary Study
Report issued by the Bureau of Mines over flood-prevention methods at Pennsylvania anthracite mines. The flood-prevention projects are discussed. This report includes tables, maps, photographs, and illustrations.
Date:
March 1946
Creator:
Ash, S. H. & Westfield, James
Object Type:
Report
System:
The UNT Digital Library
The Development of a Lateral-Control System for Use With Large-Span Flaps
"A spoiler-type lateral-control system has been developed for use on the Northrop P-61 airplane. The lateral-control system is to be used with large-span flaps and consists of a thin circular arc spoiler, linked with a short-span plain aileron located just outboard of the spoiler. This unconventional lateral-control system has been accepted with enthusiasm by the pilots who have flown the airplane" (p. 1).
Date:
January 1946
Creator:
Ashkenas, I. L.
Object Type:
Report
System:
The UNT Digital Library
High-Speed Longitudinal-Stability and Control Characteristics of the Consolidated Vultee Lark Missile as Predicted from Wind-Tunnel Tests (TED No. NACA 2391)
"A high-speed wind-tunnel investigation of the aerodynamic characteristics of a full-scale model of the Consolidated Vultee Lark indicates that the missile possesses satisfactory longitudinal-stability and-control characteristics throughout the Mach number range from 0.2 to 0.85, but that the maximum lift coefficients developed are not high enough to insure interception of the target at high altitudes. A reduction in wing loading appears advisable. Although the static longitudinal stability at zero angle of attack changes with Mach number and with lift coefficient, satisfactory control should be possible at all times as the tails retain their relatively large effectiveness throughout the range of Mach numbers and lift coefficients tested" (p. 1).
Date:
November 19, 1946
Creator:
Axelson, John A. & Martin, Andrew
Object Type:
Report
System:
The UNT Digital Library
Precipitation of Thorium Oxalate From Nitric Acid Solutions
Report documenting the results of experiments to test the solubility of thorium oxalate in nitric acid solutions and effect of excess oxalic acid. it includes graphed and tabular results: "Tabulation of Results of Oxalate Precipitations."
Date:
January 19, 1946
Creator:
Ayers, A. S.
Object Type:
Report
System:
The UNT Digital Library
Air-Flow and Performance Characteristics of Engine-Stage Supercharger of a Double-Row Radial Aircraft Engine 2: Effect of Design Variables
Report presenting an investigation to determine the effect of the location of the diffuser vanes with respect to the supercharger outlets and the effect of flow conditions at the impeller inlet on the air-flow distribution in the outlets of the engine-stage supercharger of an 18-cylinder double-row radial aircraft engine. The effect of flow conditions at the impeller inlet was investigated by distorting the flow at the inlet and noting the effect in the supercharger outlets. Results regarding the diffuser effect and inlet effect are provided.
Date:
August 1946
Creator:
Baas, Edmund J. & Dugan, Paul D.
Object Type:
Report
System:
The UNT Digital Library
Preparation of N-Polychloropolyfluoroheptane
From introduction: "Discussion of alternate processes for manufacture of perfluoroxylene as insurance against any eventuality, e.g. disaster, poor quality, required amount of elemental fluorine not obtainable, necessity for further expansion at some future date, or decreasing cost."
Date:
1946
Creator:
Babcock, J. H.; Beanblossom, W. S. & Wojcik, B. H.
Object Type:
Report
System:
The UNT Digital Library
Flight Investigation at High Speeds of the Drag of Three Airfoils and a Circular Cylinder Representing Full-Scale Propeller Shanks
Note presenting tests at high speeds to determine the drag of models, simulating propeller shanks, in the form of a circular cylinder and three airfoils with the rear 25 percent chord cut off. The results indicated that the drag of the airfoils was lower than that of the cylinder over the Mach number range investigated.
Date:
September 1946
Creator:
Barlow, William H.
Object Type:
Report
System:
The UNT Digital Library