Resource Type
Serial/Series Title
NACA Research Memorandums
162
Atomic Energy Commission Reports
52
NACA Technical Reports
35
Oak Ridge National Laboratory Reports
23
Hanford Works Reports
22
University of California Radiation Laboratory Reports
15
HW (Series)
14
ORNL (Series)
9
BNL (Series)
7
Brookhaven National Laboratory Reports
7
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339 Matching Results
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Life Zones and Crop Zones of New Mexico
Discusses geography, climate, agricultural practices, and crops of each life zone in New Mexico. Provides mammal, breeding bird, reptile, amphibian, and plant species list for each zone. Includes a life zone map.
Date:
September 5, 1913
Creator:
Bailey, Vernon
Object Type:
Report
System:
The UNT Digital Library
Revision of the American Harvest Mice: (Genus Reithrodontomys)
Discusses history, specimens, habits, economic status, food, and pelages of American harvest mice. Lists locations and provides a key to species and subspecies, and provides species descriptions.
Date:
June 5, 1914
Creator:
Howell, Arthur H.
Object Type:
Report
System:
The UNT Digital Library
Formulas, Tables and Curves for Computing the Mutual Inductance of Two Coaxial Circles
Scientific paper issued by the Bureau of Standards over the mutual inductance of two coaxial circles. As stated in the abstract, "a number of examples are given to show the methods of computation by the different formulas, tables, and charts" (p. 541). This paper includes tables, and illustrations.
Date:
August 5, 1924
Creator:
Curtis, Harvey L. & Sparks, C. Matilda
Object Type:
Report
System:
The UNT Digital Library
Motor-Vehicle Headlighting
A report on the necessity of improved motor-vehicle lighting.
Date:
August 5, 1925
Creator:
Carlson, R. E.
Object Type:
Report
System:
The UNT Digital Library
Tests on Models of Three British Airplanes in the Variable Density Wind Tunnel
"This report contains the results of tests made in the National Advisory Committee for Aeronautics variable density wind tunnel on three airplane models supplied by the British Aeronautical Research Committee. These models, the BE-2E with R.A.F. 19 wings, the British Fighter with R.A.F. 15 wings, and the Bristol Fighter with R.A.F. 30 wings, were tested over a wide range in Reynolds numbers in order to supply data desired by the Aeronautical Research Committee for scale effect studies. The maximum lifts obtained in these tests are in excellent agreement with the published results of British tests, both model and full scale" (p. 451).
Date:
April 5, 1927
Creator:
Higgins, George J.; Diehl, W. S. & DeFoe, George L.
Object Type:
Report
System:
The UNT Digital Library
Drag and Cooling With Various Forms of Cowling for A "Whirlwind" Radial Air-Cooled Engine - 1
"This report presents the results of an investigation undertaken in the 20-foot Propeller Research Tunnel at Langley Field on the cowling of radial air-cooled engines. A portion of the investigation has been completed, in which several forms and degrees of cowling were tested on Wright "Whirlwind" J-5 engine mounted in the nose of a cabin fuselage. The cowlings varied from the one extreme of an entirely exposed engine to the other in which the engine was entirely inclosed. Cooling tests were made and each cowling modified, if necessary, until the engine cooled approximately as satisfactorily as when it was entirely exposed" (p. 165).
Date:
October 5, 1928
Creator:
Weick, Fred E.
Object Type:
Report
System:
The UNT Digital Library
Full-scale tests of metal propellers at high tip speeds
This report describes tests of 10 full-scale metal propellers of several thickness ratios at various tip speeds up to 1,350 feet per second. The results indicate no loss of efficiency up to tip speeds of approximately 1,000 feet per second. Above this tip speed the loss is at a rate of about 10 per cent per 100 feet per second increase relative to the efficiency at the lower speeds for propellers of pitch diameter ratios 0.3 to 0.4. Propellers having sections of small thickness ratio can be run at slightly higher speeds than thick ones before beginning to lose efficiency.
Date:
November 5, 1930
Creator:
Wood, Donald H.
Object Type:
Report
System:
The UNT Digital Library
Wind-Tunnel Research Comparing Lateral Control Devices, Particularly at High Angles of Attack 3: Ordinary Ailerons Rigged Up 10 Degrees When Neutral
This report presents the results of wind-tunnel tests made on three model wings having different sizes of ordinary ailerons rigged up 10 degrees when neutral, the same models having previously been tested with the ailerons rigged even with the wings in the usual manner. One of the wings had ailerons of medium size, 25 per cent of the wing chord by 40 per cent of the semispan, one had long, narrow ailerons, and one had short, wide ones. These tests are part of a general investigation on lateral control devices, with particular reference to the control at high angles of attack, in which all the devices are being subjected to the same series of tests in the 7 by 10 foot wind tunnel of the National Advisory Committee for Aeronautics.
Date:
February 5, 1932
Creator:
Weick, Fred E. & Wenzinger, Carl J.
Object Type:
Report
System:
The UNT Digital Library
Characteristics of Clark Y airfoils of small aspect ratios
This report presents the results of a series of wind tunnel tests showing the force, moment, and autorotational characteristics of Clark Y airfoils having aspect ratios varying from 0.5 to 3. An airfoil of rectangular plan form was tested with rectangular tips, flared tips, and semicircular tips. Tests were also made on one airfoil of circular plan form and two airfoils of elliptical plan form. The tests revealed a marked delay of the stall and a decided increase in values of maximum lift coefficient and maximum resultant force coefficient for aspect ratios of the order of 1 as compared with values for aspect ratios of 2 and 3.
Date:
May 5, 1932
Creator:
Zimmerman, C. H.
Object Type:
Report
System:
The UNT Digital Library
Stability of Thin-Walled Tubes Under Torsion
"In this report a theoretical solution is developed for the torsion on a round thin-walled tube for which the walls become unstable. The results of this theory are given by a few simple formulas and curves which cover all cases. The differential equations of equilibrium are derived in a simpler form than previously found, it being shown that many items can be neglected" (p. 3).
Date:
May 5, 1933
Creator:
Donnell, L. H.
Object Type:
Report
System:
The UNT Digital Library
The interference between struts in various combinations
This report presents the results of wind tunnel tests made to determine the interference drag arising from various arrangements of streamline struts and round struts, or cylinders. Determinations were made of the interference drag of struts spaced side by side, struts in tandem, tandem struts encased in a single fairing, a strut intersecting a plane, and struts intersecting to form a v. Three sizes of struts were used for most of the tests. These tests show that the interference drag arising from struts in close proximity may be of considerable magnitude, in some instances amounting to more than the drag of the struts themselves.
Date:
June 5, 1933
Creator:
Biermann, David & Herrnstein, William H., Jr.
Object Type:
Report
System:
The UNT Digital Library
Manual of Fire-Loss Prevention
Principles of fire-resistance classifications of building types and materials, general methods for controlling the spread of fire, and general fire-prevention measures.
Date:
November 5, 1934
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Reduction of hinge moments of airplane control surfaces by tabs
This report presents the results of an investigation conducted in the NACA 7 by 10-foot wind tunnel of control surfaces equipped with tabs for reducing the control forces or trimming the aircraft. Two sizes of ordinary ailerons with several sizes of attached and inset tabs were tested on a Clark y wing. Tabs were also tested in combination with auxiliary balances of the horn and paddle types, and with a frise balance aileron.
Date:
February 5, 1935
Creator:
Harris, Thomas A.
Object Type:
Report
System:
The UNT Digital Library
Auto-Ignition and Combustion of Diesel Fuel in a Constant-Volume Bomb
Report presents the results of a study of variations in ignition lag and combustion associated with changes in air temperature and density for a diesel fuel in a constant-volume bomb. The test results have been discussed in terms of engine performance wherever comparisons could be drawn. The most important conclusions drawn from this investigation are: the ignition lag was essentially independent of the injected fuel quantity. Extrapolation of the curves for the fuel used shows that the lag could not be greatly decreased by exceeding the compression-ignition engines. In order to obtain the best combustion and thermal efficiency, it was desirable to use the longest ignition lag consistent with a permissible rate of pressure rise.
Date:
October 5, 1937
Creator:
Selden, Robert F.
Object Type:
Report
System:
The UNT Digital Library
Design of NACA Cowlings for Radial Air-Cooled Engines
"The information on the propeller-cowling-nacelle combinations, presented in Technical Reports nos. 592, 593, and 596 and in Technical Note 620, is applied to the practical design of NACA cowlings. The main emphasis is placed on the method of obtaining the dimensions of the cowling; consequently, the physical functioning of each part of the cowling is treated very briefly. A practical method of designing cowlings and some examples are presented" (p. 383).
Date:
March 5, 1938
Creator:
Stickle, George W.
Object Type:
Report
System:
The UNT Digital Library
Interference of Tail Surfaces and Wing and Fuselage from Tests of 17 Combinations in the N.A.C.A. Variable-Density Tunnel
"An investigation of the interference associated with tail surfaces added to wing-fuselage combinations was included in the interference program in progress in the NACA variable-density tunnel. The results indicate that, in aerodynamically clean combinations, the increment of the high-speed drag can be estimated from section characteristics within useful limits of accuracy. The interference appears mainly as effects on the downwash angle and as losses in the tail effectiveness and varies with the geometry of the combination" (p. 689).
Date:
November 5, 1938
Creator:
Sherman, Albert
Object Type:
Report
System:
The UNT Digital Library
Cooling on the front of an air-cooled engine cylinder in a conventional engine cowling
Measurements were made of the cooling on the fronts of model cylinders in a conventional cowling for cooling in both the ground and the cruising conditions. The mechanisms of front and rear cooling are essentially different. Cooling on the rear baffled part of the cylinders continually increases with increasing fin width. For the front of the cylinder, an optimum fin width was found to exist beyond which an increase in width reduced the heat transfer. The heat transfer coefficient on the front of the cylinders was larger on the side of the cylinder facing the propeller swirl than on the opposite side. This effect became more pronounced as the fin width was increased. These results are introductory to the study of front cooling and show the general effect of several test parameters.
Date:
April 5, 1939
Creator:
Brevoort, M. J. & Joyner, U. T.
Object Type:
Report
System:
The UNT Digital Library
An Approximate Method of Calculation of Relative Humidity Required to Prevent Frosting on Inside of Aircraft Pressure Cabin Windows, Special Report
This report has been prepare in response to a request for information from an aircraft company. A typical example was selected for the presentation of an approximate method of calculation of the relative humidity required to prevent frosting on the inside of a plastic window in a pressure type cabin on a high speed airplane. The results of the study are reviewed.
Date:
December 5, 1940
Creator:
Jones, Alun R.
Object Type:
Report
System:
The UNT Digital Library
Capture Cross Section of Pb208 for C Neutrons
From abstract: "Using the method of induced radioactivity, the capture cross section of Pb[^]208 for C neutrons is found to be .00045 ± .00015 x 10[^]-24 cm[^]2. This is definitely lower than the value of .001 x 10[^]-24 reported by Maurer and Ramm."
Date:
November 5, 1943
Creator:
Levinger, Joseph S., 1921-; Compton, A. H.; Allison, Samuel King, 1900-1965; Watson, W. W. & Snell, A. H.
Object Type:
Report
System:
The UNT Digital Library
A method for studying the hunting oscillations of an airplane with a simple type of automatic control
"A method is presented for predicting the amplitude and frequency, under certain simplifying conditions, of the hunting oscillations of an automatically controlled aircraft with lag in the control system or in the response of the aircraft to the controls. If the steering device is actuated by a simple right-left type of signal, the series of alternating fixed-amplified signals occurring during the hunting may ordinarily be represented by a "square wave." Formulas are given expressing the response to such a variations of signal in terms of the response to a unit signal" (p. 487).
Date:
May 5, 1944
Creator:
Jones, Robert T.
Object Type:
Report
System:
The UNT Digital Library
Introduction to Diffusion Theory and to Pile-Theory
The following report describes and foretells the situation in medium in which neutrons are being (a)produced as fast neutrons, (b) slowed down to thermal speeds by impacts with nuclei, and (c) absorbed by nuclei in such a manner that sometimes fresh fast neutrons appear at the place where a thermal neutron has just appeared.
Date:
October 5, 1944
Creator:
Darrow, Karl K.
Object Type:
Report
System:
The UNT Digital Library
Neutron Distribution Around a black Sphere with a Gap
Abstract. Successive approximations ae obtained from transport theory for the neutron distribution around a black sphere surrounded by a spherical gap and a non-absorbing medium extending to infinity. Six cases are calculated numerically to show the difference between this treatment and simple diffusion theory. The extrapolation distance and a quantity that is essentially the thermal utilization are calculated in different approximations. It is found that the neutron density in the gap, instead of being a constant as predicted by the simple theory, may vary by a factor of one-third in cases of practical interest.
Date:
December 5, 1944
Creator:
Plass, G. N.
Object Type:
Report
System:
The UNT Digital Library
The Influence of Exhaust Pressure on Knock-Limited Performance
Report discussing testing on two types of single cylinders to determine the effect of the relation of exhaust pressure to inlet-air pressure on knock-limited performance. Variables explored included exhaust pressure, fuel-air ratio, and engine speed. Three types of fuels were also used to explore the effect of exhaust pressure on fuel ratings.
Date:
January 5, 1945
Creator:
Cook, Harvey A.; Held, Louis F. & Pritchard, Ernest I.
Object Type:
Report
System:
The UNT Digital Library
The Effect of Neutron Bombardment on the Specific Heat of Graphite at Low Temperatures
The work described in this technical report was undertaken as part of a larger program dealing with a systematic investigation of changes in the physical prosperities of artificial graphite due to neutron bombardment. Very pronounced among those changes is the increase in the elastic modulus. Since there is a general relationship between the elastic modulus of a given substance and its specific heat, it was expected that corresponding changes will occur in the specific heat. In conclusion, the experiments determined that it appears that the low temperature specific heat measurements of strongly bombarded samples will be helpful for the understanding of the nature and the mechanism of the changes produced by neutron bombardment and annealing.
Date:
September 5, 1945
Creator:
Estermann, I. (Immanuel), 1900-1973 & Kirkland, G. I.
Object Type:
Report
System:
The UNT Digital Library