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19,303 Matching Results
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F.C.D.A. Family Shelter Evaluation
In order to determine the effects of atomic explosions on small civil defense shelters for family use, 29 simple structures were built along an arc 1200 ft from the target point and exposed to Buster Bursts B, C, and D. The structures were of four basic types; covered-trench, metal-arch, wood-arch, and basement lean-to. Because of poor cohesive properties of the soil, much of the earth cover on the shelters was removed by the first shot. Since test procedures prevented restoration of structures and replacement of cover after each blast, test results were materially affected. Partly above-grade cover-trench shelters provided less protection against blast than belowgrade cover-trench shelters and were much less desirable as protection against gamma radiation. Metal-arch shelters set in concrete appeared to have good potentialities with minor design modifications. Wood-arch shelters as designed, proved to be unsuitable substitutes for metalarch shelters. No worthwhile information was obtained on basement lean-to shelters. Unusual conditions disclosed design deficiencies in entrance construction, front, and end sections, and effective earth cover. Small shelters are potentially capable of meeting requirements of civil defense. (auth)
Date:
March 1, 1952
Creator:
Flynn, A. P.
System:
The UNT Digital Library
Nature of atmospheric dust. Progress report to January 15, 1955
Optical microscopic examination of air- and rain-borne dust shows most of the particles to be less than one micron in diameter. Electron microscopic examination of the same dust shows predominantly clusters of particles whose individual diameters are in the range 200 to 1000 A. The residue obtained by filtering rain water through a millipore filter is found to be slightly radioactive in more than half the cases observed.
Date:
January 20, 1955
Creator:
Heininger, C. & Turkevich, J.
System:
The UNT Digital Library
Sources of Early Teller Light.
None
Date:
January 1, 1958
Creator:
Parker, L. W.
System:
The UNT Digital Library
GRAIN REFINEMENT PRODUCED BY AN ALPHA PHASE ANNEAL OF BETA PHASE HEAT TREATED AND WATER QUENCHED URANIUM
During an experiment involving alpha phase annealing (at 610 to 655 deg C for 5 and 10 min) of beta-quenched uranium, it was determined that the relatively coarse, irregular shaped grains (0.08 to 0.150 mm in diameter) in the beta-quenched structure, were replaced by fine equiaxed grains (0.04 to 0.09 mm in diameter). (auth)
Date:
January 1, 1955
Creator:
Gardner, H.R.
System:
The UNT Digital Library
PLUTONIUM OXALATE DISK FILTER AND FILTER MEDIA STUDIES
for filtration of plutonium oxalate slurries. A scalpel produces a slit in the filter precoat, leading to increased filtration in this slit, and the oxalate is removed by a doctor knife; this technique results in prolonged blowback cycles and more uniform delivery of filtered oxalate to subsequent processing steps. Several types of filter media were tested, and rigid porous aluminum oxide was found to be the best one. (D.L.C.)
Date:
October 19, 1959
Creator:
Rey, G.
System:
The UNT Digital Library
Reactor Materials Study. Research and Development of Metal Hydrides. Quarterly Report No. 4 for July 1, 1959 to September 30, 1959
Activities during the period were directed primarily toward determination of the engineering properties of hydrided materials. The tensile strength and elongation, thermal expansion, thermal conductivity, and heat capacity of ZrH were determined as functions of temperature and H content. Preliminary results of Ti-base material studies indicate that these materials can be used for shielding and structural materials with the incorporation of rare earth hydrides. A summary of the work from Oct. l958 to Sept. 1959 is included. (J.R.D.)
Date:
October 30, 1959
Creator:
Beck, R. L.
System:
The UNT Digital Library
Positional Tolerancing at Sandia Corporation
The positional tolerance method of dimensioning is described. The emphasis is placed on the elimination of ambiguities and increase in tolerances provided by this method as compared to the older, bilateral method. (auth)
Date:
May 1, 1959
Creator:
Eichert, F. F. & Nicovich, P. A.
System:
The UNT Digital Library
Dissolution of aluminium oxide as a regulating factor in aqueous aluminum corrosion
The solubility of aluminum corrosion product in contact with metallic aluminum in deionized water has been determined over the range 80 to 350/sup 0/C. Evidence is presented to show that oxide dissolution results in the formation of a porous oxide on aluminum exposed in refreshed dynamic systems. Dynamic corrosion rate data have been analyzed on the basis of parabolic film growth and a linear oxide degradation process acting simultaneously on the system. The degradation process has been shown to be a function of refreshment rate.
Date:
August 31, 1959
Creator:
Dillon, R.L.
System:
The UNT Digital Library
Ophthalmologic survey of atomic bomb survivors in Japan, 1949. Atomic bomb radiation cataract case report with histopathologic study. Medical examination of Hiroshima patients with radiation cataracts
This document contains 3 reports dealing with the delayed effects of radiation on the eyes of survivors of the atomic explosions in Hiroshima and Nagasaki. In the first study, 1000 persons who were listed as having been in the open and within two kilometers of the hypocenter at the time of the explosion were selected at random from the census files of the Atomic Bomb Casualty Commission for study. In addition, 231 others, comprising the total available number of surviving persons listed at present in the census files as having been within one kilometer of the hypocenter, were examined, as were several hundred others who were contacted through newspaper publicity, referrals from local ophthalmologists, or through hearsay. The survey resulted in bringing in persons having, or having had, a variety of ocular conditions. Those connected with the atomic bomb included the following diagnoses; multiple injuries of eyes and eyelids; keratoconjunctivitis from ultraviolet and ionizing radiations; thermal burn of the cornea and of the retina; retinitis proliferans; and radiation cataracts. The cataracts were the only delayed manifestations of ocular injury from the atomic bomb. The second paper is a case report of a histopathologic study of atomic bomb radiation cataract. The …
Date:
January 1, 1959
Creator:
Cogan, D.G.; Martin, S.F.; Kimura, S.J.; Ikui, Hiroshi & Fillmore, Paul G.
System:
The UNT Digital Library
DESIGN OF A HIGH TEMPERATURE AIR MOTOR
The basic design and development concepts are presented on a six vane air motor intended for use at elevated temperatures. (auth)
Date:
January 1, 1958
Creator:
Schnorr, F.W. Jr.
System:
The UNT Digital Library
Concentration of Plutonium by Cation Exchange--Stabilization of Pu(III) in Nitric Acid
A study to define the effectiveness limits of sulfamic acid and to discover other better stabilizers for Pu(III) is described. Ascorbic and isoascorbic acids, used in conjunction with sulfamic acid reduced Pu(IV) to stable Pu(III) in nitric acid. Aminoguanidine sulfate also retarded the oxidation of Pu(III) but did not reduce Pu(IV). (J.R.D.)
Date:
February 1, 1959
Creator:
Tober, F. W. & Russel, E. R.
System:
The UNT Digital Library
DISCUSSION OF PERFORMANCE CALCULATIONS OF NUCLEAR ROCKET ENGINES
BS>Some of the fundamental relationships in a nuclear rocket engine are discussed. The equations required to calculate the performance of the rocket are presented. The problems associated with these calculations are also pointed out. (auth)
Date:
December 21, 1959
Creator:
Semple, E.L.
System:
The UNT Digital Library
REACTIVITY LIFETIME. TEST RESULTS DL-S-225(T-612118A). Section I, Second Performance
The performance, reliability, stability, and reactivity lifetime variations of the Shippingport PWR are determined under normal steady state conditions. These characteristics are studied over a period of 758 EFPH, at a power level of about 60 Mw(e). Flux-tilt corrections and plant operations during this time are described. (T.F.H.)
Date:
March 1, 1959
Creator:
unknown
System:
The UNT Digital Library
Nuclear Parameter Survey of Molybdenum-Uranium Alloy Fuels for the Sheldon Reactor
A parameter survey was conducted on 19-rod fuel clusters using 3 and 10 wt.% Mo--U alloys. Graphs are included for the core diameter and initial conversion ratio for k/sub eff/= 1.064 as a function of moderator can size, and for the effect of the Mo resonance integral. (D. L.C.)
Date:
March 28, 1958
Creator:
Blaine, R. A.
System:
The UNT Digital Library
Hydrides and Metal-Hydrogen Systems. Final Report
The work reported deals with the preparation and physical properties, especially thermal dissociation pressures, and densities of hydrides, hydrogen- metal systems, and mixtures of hydrides with other substances. Possible applicatlons as moderators, high-temperature neutron shields, and low-temperature shields are cited and design problems discussed. Most of the data on dissociation pressures cover ranges and compounds not hltherto explored because of experimental difficulties and the basic knowledge of the thermal behavior of hydrides was substantially increased. New hydrldes were prepared and several reported in the literature were shown not to exist. The following compounds, mixtures, and systems were studled: Tl-H, U-H, Ll-H, Na-H, Ca-H, Ba-H, Th-H, Sr- H; NaH-NaF, NaH-NaOH, NaH-CaH/, LlH-LiF, CaH/sub 2/-CaF/sub 2/, CaH/sub 2/-CaC/ sub 2/,CaH/sub 2/-Ca/sub 3/N/sub 2/; FeH/sub 3/ (alleged), NiH/sub 2/ (alleged), Ti(BH/sub 4/)/sub 3/, Th(BH/sub 4/)/sub 4/, WH/sub 4/ (attempted), W(BH/sub 4/)/ sub 4/ (attempted), /sub 4/NBH/sub 4/, (CH , and ydrides are ing an N/sub H/ comparable to water yet stable at red heat, compounds giving a neutron shield weight less than half that of water, and compounds suitable for use as hightemperature moderators containing large amounts of hydrogen. (auth)
Date:
April 30, 1951
Creator:
Gibb, T. R. P., Jr.
System:
The UNT Digital Library
Annual Report of the National Advisory Committee for Aeronautics (42nd). Administrative Report Including Technical Report Nos. 1254 to 1295
Report includes the National Advisory Committee for Aeronautics letter of submittal to the President, summaries of the committee's activities and research accomplished, bibliographies, and financial report.
Date:
1957
Creator:
unknown
System:
The UNT Digital Library
Investigations toward simplification of missile control systems
Paper presenting three ideas regarding potential simplifications of missile-control systems in order to make them more reliable without sacrificing system performance. The three methods presented include an autorotating-vane spoiler, a bellows flap, and free controls. All are based on modified airplane control systems.
Date:
November 12, 1953
Creator:
Curfman, Howard J., Jr.; Strass, H. Kurt & Crane, Harold L.
System:
The UNT Digital Library
Comparison of the performance of a helicopter-type ram-jet engine under various centrifugal loadings
Report presenting an investigation of an 18-foot-radius helicopter rotor powered by tip-mounted ramjet engines in the helicopter test tower. The engine performance is compared with the performance determined in a previous investigation of a 9-foot-radius rotor with the same engines at similar speeds but with twice the centrifugal forces. Results regarding the propulsive characteristics, minimum specific fuel consumption and corresponding propulsive thrust, and operational characteristics are provided.
Date:
October 7, 1953
Creator:
Radin, Edward J. & Carpenter, Paul J.
System:
The UNT Digital Library
Large-scale low-speed wind-tunnel tests of a model having a 60 degree delta horizontal canard control surface and wing to obtain static-longitudinal-stability and canard surface hinge-moment data
Report presenting a wind-tunnel investigation of a model equipped with a 60 degree delta wing and a 60 degree delta horizontal all-movable canard control surface to determine the stability, control, and canard-surface hinge-moment characteristics at low speeds and at a Reynolds number of 9 x 10(exp 6). Two longitudinal positions of the canard surface were tested. Results regarding lift and pitching moment, drag, and hinge moment are provided.
Date:
June 17, 1954
Creator:
Burrows, Dale L.
System:
The UNT Digital Library
Wind-Tunnel Investigation to Determine the Horizontal- and Vertical-Tail Contributions to the Static Lateral Stability Characteristics of a Complete-Model Swept-Wing Configuration at High Subsonic Speeds
Results regarding an investigation to determine the horizontal- and vertical-tail contributions to the static lateral stability of a complete-model swept-wing configuration at high subsonic speeds. Generally, Mach number effects within the range studied and wing effects on the tail contribution were small and the overall trends of the data of the present investigation agreed with those which have been established at low speeds.
Date:
July 10, 1953
Creator:
Wiggins, James W.; Kuhn, Richard E. & Fournier, Paul G.
System:
The UNT Digital Library
Reciprocity relations in aerodynamics
From Introduction: "The purpose of the present paper is twofold. First, a close connection will be established between reverse-flow theorems in subsonic and supersonic, steady-state wing theory and known reciprocity relations between two solutions of the equation the flow field."
Date:
May 1952
Creator:
Heaslet, Max A. & Spreiter, John R.
System:
The UNT Digital Library
Rocket-Model Investigation to Determine the Hinge-Moment and Normal-Force Properties of a Full-Span, Constant-Chord, Partially Balanced Trailing-Edge Control on a 60 Degree Clipped Delta Wing Between Mach Numbers of 0.50 and 1.26
Report presenting a free-flight investigation of a rocket-powered research model to determine the hinge-moment and normal-force characteristics of a trailing-edge control on a delta wing between Mach numbers of 0.50 and 1.26. The hinge-line location of 40 percent control chord satisfactorily reduced the high hinge moments associated with plain flap-type controls. Results regarding hinge moments and normal force are provided.
Date:
October 30, 1953
Creator:
Martz, C. William & Goslee, John W.
System:
The UNT Digital Library
A pressure-distribution investigation of a fineness-ratio-12.2 parabolic body of revolution (NACA RM-10) at M = 1.59 and angles of attack up to 36 degrees
Report presenting a pressure-distribution investigation of a parabolic body of revolution with a fineness ratio of 12.2, which was performed in the 4- by 4-foot supersonic tunnel at Mach number 1.59 and Reynolds number 3.6 x 10(sub 6), based on body length, for a range of angles of attack. Results regarding basic pressures, aerodynamic coefficients, asymmetrical pressures, comparison of experimental and theoretical pressures, artificial roughness, section coefficients, and body coefficients are provided.
Date:
October 30, 1952
Creator:
Cooper, Morton; Gapcynski, John P. & Hasel, Lowell E.
System:
The UNT Digital Library
A study of the use of various high-lift devices on the horizontal tail of a canard airplane model as a means of increasing the allowable center-of-gravity travel
Report presenting an investigation to study the use of various high-lift devices on the horizontal tail of a canard airplane model as a means of increasing the allowable center-of-gravity travel. The results indicated that the large increases in allowable center-of-gravity travel could be obtained using the devices. Results regarding the basic aerodynamic data, effect of tail configuration on the allowable center-of-gravity travel, and a comparison of measured and predicted values of the allowable center-of-gravity travel are provided.
Date:
January 21, 1953
Creator:
Johnson, Joseph L., Jr.
System:
The UNT Digital Library