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32
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15
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341 Matching Results
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Vibration response of airplane structures
This report presents test results of experiments on the vibration-response characteristics of airplane structures on the ground and in flight. It also gives details regarding the construction and operation of vibration instruments developed by the National Advisory Committee for Aeronautics.
Date:
May 10, 1934
Creator:
Theodorsen, Theodore & Gelalles, A. G.
System:
The UNT Digital Library
Investigation of Full-Scale Split Trailing-Edge Wing Flaps With Various Chords and Hinge Locations
This report gives the results of an investigation conducted in the NACA full-scale wind tunnel on a small parasol monoplane equipped with three different split trailing-edge wing flaps. The object of the investigation was to determine and correlate data on the characteristics of the airplane and flaps as affected by variation in flap chord, flap deflection, and flap location along the wing chord. The results give the lift, the drag, and the pitching moment characteristics of the airplane, and the flap forces and moments, the pressure distribution over the flaps and wing at one section, and the downwash characteristics of the flap and wing combinations.
Date:
May 10, 1935
Creator:
Wallace, Rudolf
System:
The UNT Digital Library
Progress Report on Metallurgy of Tuballoy to University of Chicago
None
Date:
May 10, 1943
Creator:
unknown
System:
The UNT Digital Library
100 Areas: (For Technical Progress Letter No. 96), April 30--May 6
None
Date:
May 10, 1946
Creator:
Jordan, W. E.
System:
The UNT Digital Library
The Coprecipitation of Thorium and Uranium Peroxides
From abstract: "Experiments covering the coprecipitation of Thorium and Uranium peroxides are described on synthetic and actual 1300 cycle machine wash effluents."
Date:
May 10, 1946
Creator:
Oringer, Roy; Woodard, R. W. & Larson, C. E.
System:
The UNT Digital Library
A Simple Approximate Method for Obtaining Spanwise Lift Distributions Over Swept Wings
"It is shown how Schrenk's empirical method of estimating the lift distribution over straight wings can be adapted to swept wings by replacing the elliptical distribution by a new "ideal" distribution which varies with sweep.The application of the method is discussed in detail and several comparisons are made to show the agreement of the proposed method with more rigorous ones. It is shown how first-order compressibility corrections applicable to subcritical speeds may be included in this method" (p. 1).
Date:
May 10, 1948
Creator:
Diederich, Franklin W.
System:
The UNT Digital Library
High-subsonic damping-in-roll characteristics of a wing with the quarter-chord line swept back 35 degrees and with aspect ratio 3 and taper ratio 0.6
Report presenting an investigation of the damping-in-roll characteristics of a 35 degree sweptback wing, with and without vertical fins, through a range of Mach numbers in the high speed 7- by 10-foot tunnel utilizing a free-to-roll technique. The damping-in-roll coefficient increased in magnitude with Mach number in the manner indicated by theory and generally was found to increase in magnitude with angle of attack over the range tested.
Date:
May 10, 1949
Creator:
Myers, Boyd C., II & Kuhn, Richard E.
System:
The UNT Digital Library
Technical Report to the General Advisory Committee
This report provides a discussion of technical activities at the Hanford Works as of May 10, 1949.
Date:
May 10, 1949
Creator:
Greninger, A. B.
System:
The UNT Digital Library
Corrosion Test Procedure for the Selection of Crystal Bar Zirconium for Use in Naval Reactor Fuel Elements. (Includes Addendum)
None
Date:
May 10, 1950
Creator:
Saitta, V. F.
System:
The UNT Digital Library
A Measurement of the Positive π-μ Decay Lifetime
None
Date:
May 10, 1950
Creator:
Chamberlain, O.; Mozley, R. F.; Steinberger, J. & Wiegand, C.
System:
The UNT Digital Library
A MEASUREMENT OF THE POSITIVE pi- Mu DECAY LIFETIME
The lifetime for the decay of a {pi} meson into {mu} meson and neutral particle was first measured by Richardson and later by Martinelli and Panofsky. The method was the same in both cases: The fraction of {pi} mesons surviving various times of flight is measured by placing photographic detectors at various path lengths from the target. In the experiment reported here we observe the time lag between the two bursts of fluorescence due to mesons decaying in a scintillation crystal. The first burst is due to the stopping of the entering {pi} meson, the second to the {mu}-meson. As is shown in Fig. 1, a particle penetrating the first and into the second crystal starts the sweep (10{sup -8} sec/mm) of an oscilloscope. The pulses in the second crystal are delayed 0.5 x 10{sup -6} sec to allow the sweep to start and brighten and are then photographed. If the responsible particle is a {pi}{sup +} meson which stops in the crystal, it undergoes {pi}-{mu} decay and two pulses appear on the trace. The {mu}{sup +} meson has a range of only 2 mm in the crystal. If its decay electron is detected some time (.5-2.5 x 10{sup -6} …
Date:
May 10, 1950
Creator:
Chamberlain, O.; Mozely, R.F.; Steinberger, J. & Wiegand, C.
System:
The UNT Digital Library
The Stability of the Compression Cover of Box Beams Stiffened by Posts
"An investigation is made of the buckling of the compression cover of post-stiffened box beams subjected to end moments. Charts are presented for the determination of the minimum post axial stiffnesses and the corresponding compressive buckling loads required for the compression cover to buckle with nodes through the posts. Application of the charts to design and analysis and the limitations of their use are discussed" (p. 1087).
Date:
May 10, 1950
Creator:
Seide, Paul & Barrett, Paul F.
System:
The UNT Digital Library
A biharmonic relaxation method for calculating thermal stress in cooled irregular cylinders
A numerical method was developed for calculating thermal stresses in irregular cylinders cooled by one or more internal passages. The use of relaxation methods and elementary methods of finite differences was found to give approximations to the correct values when compared with previously known solutions for concentric circular cylinders possessing symmetrical and asymmetrical temperature distributions.
Date:
May 10, 1951
Creator:
Holms, Arthur G.
System:
The UNT Digital Library
Chemistry Division Quarterly Progress Report for Period Ending March 31, 1951
Quarterly technical report including reports on chemistry of source, fissionable, and structural elements, nuclear chemistry, radio-organic chemistry, chemistry of separations processes, chemical physics, radiation chemistry, and instrumentation. [From Abstract]
Date:
May 10, 1951
Creator:
Lind, S. C.; Boyd, G. E. & Bredig, M. A.
System:
The UNT Digital Library
The DD and TD Cross Sections
The total cross sections of the reactions DDp, DDn, TD at 10 kev to 10 Mev are estimated from a review of the experimental data up to January 1951. Maxwell averages for DDp and TD computed from these estimates are given, together with some fitted analytic expressions provided for machine use. A collection of the identifiable earlier estimates is also included for reference and for comparison with the new figures. For relative order of magnitude purposes, cross sections and the derived Maxwell averages are given down to 50 ev using the theoretical Gamow slopes for the extrapolation. Gamow plots for the derived cross sections above l0 kev arc also given. Much of the primary experimental data exists in the form of thick target yields and we find the most uncertain factor in converting these thick targets yields into cross sections is the magnitude of the D/sub 2/O stopping cross section. The particular D/sub 2/O stopping cross section relation used in this derivation together with some of the earlier stopping cross sections are given. Thick target yields are included for both DD and TD on D/sub 2/ targets, at 0.01 to 1 Mev, experimental values being supplemented by calculated values.
Date:
May 10, 1951
Creator:
Tuck, J L
System:
The UNT Digital Library
The Decontamination of Uranium from Fission Products by the Use of the Uranyl Oxalate Precipitation Reaction
Abstract: "Decontamination factors of the order of 10-4 were obtained for Beta and Gamma emitters present as fission products when uranium was precipitated from 50 mC activity level solutions as uranyl oxalate under normal uranium yield conditions for three cycles (~60%). Factors of the order of 10-3 were obtained by the use of this reaction with similar solutions under relatively high uranium yield conditions for three cycles (~90%). The uranium peroxide precipitation reaction proved to be of no value on such solutions, yielding decontamination factors of only 17.1 Beta emitters and 1.2 for Gamma emitters for three cycles."
Date:
May 10, 1951
Creator:
Kelchner, B. L.
System:
The UNT Digital Library
Review of Columbia River studies program -- H. I. Development Division
In view of current work on the Columbia River by the Biology Division and Development Division of the Health Instrument Divisions and the contemplated studies of the US Public Health Service Group new at Hanford, it was suggested that the groups review their programs related to studies of the Columbia River. The work carried out by the Control Functions Section of the Health Instrument Division in this respect is reviewed in outline form. Some of the studies are jointly carried out by the Control Functions Section and the Methods Group of the Environmental Hazards Section. The principal purpose for monitoring the Columbia River is to evaluate any radiation hazards that might exist as the result of discharging radioactive effluent into the river from the Hanford pile areas. The miscellaneous special studies conducted so supplement the routine monitoring program are pointed at into the river to better understand the effects of this radioactive contamination on the environment of the river and/or any drinking water supplies using the Columbia river as a source of supply. 1 fig.
Date:
May 10, 1951
Creator:
Singlevich, W.
System:
The UNT Digital Library
Theoretical performance of lithium and fluorine as a rocket propellant
Theoretical performance for liquid lithium and liquid fluorine as a rocket propellant was calculated with assumptions both of equilibrium and frozen composition during expansion. Parameters included were specific impulse, combustion-chamber temperature, nozzle-exit temperature, composition, mean molecular weight, characteristic velocity, coefficient of thrust, and ratio of nozzle-exit area to throat area. For chamber pressure of 300 pounds per square inch absolute and expansion to 1 atmosphere, the maximum equilibrium specific impulse calculated was 335.5 pound-seconds per pound. The effect of ionization on calculated performance was shown to be negligible by comparison of values of various parameters calculated both with and without ionized products of combustion.
Date:
May 10, 1951
Creator:
Gordon, Sanford & Huff, Vearl N.
System:
The UNT Digital Library
The transonic characteristics of 17 rectangular, symmetrical wing models of varying aspect ratio and thickness
Report presenting an investigation to determine the aerodynamic characteristics of a series of thin, rectangular wings in the 16-foot high-speed wind tunnel using the transonic bump technique over a range of Mach and Reynolds numbers. Lift, drag, and pitching moment characteristics are presented for wings of 4 different aspect ratios and NACA 63A0XX sections and with 5 different thickness-to-chord ratios.
Date:
May 10, 1951
Creator:
Nelson, Warren H. & McDevitt, John B.
System:
The UNT Digital Library
FREQUENCY COMPONENTS OF A STEP FUNCTION AND A SINUSOID
None
Date:
May 10, 1955
Creator:
McGehee, R. M.
System:
The UNT Digital Library
Frequency Components of a Step Function and a Sinusoid
Fourier analyses are made on two functions. The first is a step function forward from periodic samples of a sinusoid. If the frequency of the sinusoid is less than one-half of the sampling frequency, it is shown that the step function has no frequency components less than one-half of the sampling frequency other than that of phase, and duration with respect to the interval of the analysis. It is shown that the insertion of a blank space in the period of analysis reduces greatly the uncertainty of the amplitude of the initial sinusoid as estimated from the results of the Fourier analysis. The results of the analyses are useful in the design and evaluation of certain analog data-analyzing systems.
Date:
May 10, 1955
Creator:
McGehee, R. M.
System:
The UNT Digital Library
[Invoice for Cattle Account, May 10, 1955]
Invoice for items sold for Sugarland Industries by the Live Stock Commission Company, including the pricing and amount of cattle sold.
Date:
May 10, 1955
Creator:
C. B. Johnson Live Stock Commission Company
System:
The Portal to Texas History
[Invoice for Cattle Account, May 10, 1955]
Invoice for items sold for Sugarland Industries by the Live Stock Commission Company, including the pricing and amount of cattle sold.
Date:
May 10, 1955
Creator:
C. B. Johnson Live Stock Commission Company
System:
The Portal to Texas History
Mechanical and physical properties of uranium. Chapter 8 of nuclear metallurgy lectures
A knowledge of the mechanical and physical properties of uranium is important in understanding its pile behavior. The effects of irradiation on the properties of uranium will be dealt with in another chapter. However, it is important to know and understand the pre-irradiation properties of uranium prior to investigating the effects of irradiation. This chapter discusses the mechanical and physical properties of uranium.
Date:
May 10, 1955
Creator:
Hueschen, R. E.
System:
The UNT Digital Library