Resource Type
Serial/Series Title
NACA Research Memorandums
269
NACA Technical Notes
133
Atomic Energy Commission Reports
113
NACA Technical Reports
54
NACA Technical Memorandums
50
United States Bureau of Mines Reports
48
Hanford Works Reports
33
Report of investigations (United States. Bureau of Mines)
30
HW (Series)
29
United States Geological Survey Reports
27
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States
741 Matching Results
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721 - 741 of
741
Safety and Performance Characteristics of Liquid-Oxygen Explosives
From Scope of Report: "This bulletin is confined chiefly to a discussion of tunnels and adits for mining purposes, such as drainage, transportation, or development, but it also discusses those used to carry water for power, irrigation, or domestic use, in which the essential features are practically identical with mine tunnels."
Date:
1949
Creator:
Tournay, W. E.; Bower, F. M. & Brown, F. W.
Object Type:
Report
System:
The UNT Digital Library
A simplified method for the determination and analysis of the neutral-lateral-oscillatory-stability boundary
A necessary condition for neutral oscillatory stability is that Routh's discriminant r, formed from the coefficients of the stability equation, is equal to zero. Computations obtained from rsub1=0 and d=0 show very good agreement with the results calculated by the expression for r=0. The nature of the modes of motion as a function of the directional-stability derivative and the effective-dihedral derivative is discussed in detail.
Date:
1949
Creator:
Sternfield, Leonard & Gates, Ordway B., Jr.
Object Type:
Report
System:
The UNT Digital Library
A Statistical Study of Wave Conditions at Four Open-Sea Localities in the North Pacific Ocean
Note presenting a study of conditions in the Pacific Ocean to investigate several characteristics in the sea and wind that are of importance in the structural design of flying boats and seaplanes: wave height and frequency of occurrence, wave length-height ratio and frequency of occurrence, wave velocity and its relation to wave lengths, wind velocity, and wave shape.
Date:
January 1949
Creator:
Harney, L. A.; Saur, J. F. T., Jr. & Robinson, R. A.
Object Type:
Report
System:
The UNT Digital Library
Structural Geology of the Hawthorne and Tonopah Quadrangles, Nevada
From introduction: The object of this paper is to describe the salient features of Jurassic diastrophism in parts of the Tonopah and Hawthorne quadrangles in west-central Nevada. The problem is complicated by the lack of continuity of exposures, earlier folding of the older rocks, metamorphism caused by the later granitic in-trusions, and by superposed Tertiary and later normal faults.
Date:
1949
Creator:
Ferguson, Henry G. & Muller, Siemon W.
Object Type:
Report
System:
The UNT Digital Library
Study by the Prandtl-Glauert method of compressibility effects and critical Mach number for ellipsoids of various aspect ratios and thickness ratios
From Summary: "By the use of a form of the Prandtl-Glauert method that is valid for three-dimensional flow problems, the value of the maximum incremental velocity for compressible flow about thin ellipsoids at zero angle of attack is calculated as a function of the Mach number for various aspect ratios and thickness ratios. The critical Mach numbers (within the accuracy of the Prandtl-Glauert method) of the various ellipsoids are also determined. The results indicate an increase in critical Mach number with decrease in aspect ratio which is large enough to explain experimental results on low-aspect-ratio wings at zero lift."
Date:
January 1949
Creator:
Hess, Robert V. & Gardner, Clifford S.
Object Type:
Report
System:
The UNT Digital Library
A study of stall phenomena on a 45 degree swept-forward wing
Report presenting an investigation to determine the underlying causes of the undesirable longitudinal characteristics of a 45 degree swept-forward wing in the moderate and high lift-coefficient range. Several methods were used to create a detailed correlation between separation phenomena and longitudinal characteristics of the wing. Both turbulent and leading-edge separation need to be postponed in order to improve the longitudinal characteristics of this wing.
Date:
January 1949
Creator:
McCormack, Gerald M. & Cook, Woodrow L.
Object Type:
Report
System:
The UNT Digital Library
Summary of section data on trailing-edge high-lift devices
"A summary has been made of available data on the characteristics of airfoil sections with trailing-edge high-lift devices. Data for plain, split, and slotted flaps are collected and analyzed. The effects of each of the variables involved in the design of the various types of flap are examined and, in cases where sufficient data are given, optimum configurations are deduced. Wherever possible, the effects of airfoil section, Reynolds number, and leading-edge roughness are shown. For single and double slotted flaps, where a large amount of unrelated data are available, maximum lift coefficients of many configurations are presented in tables" (p. 1).
Date:
1949
Creator:
Cahill, Jones F.
Object Type:
Report
System:
The UNT Digital Library
Tables of the Confluent Hypergeometric Function F(n/2, 1/2; X) and Related Functions
Report presenting tables of the confluent hypergeometric function and some related functions. Information regarding the scope of tables, analytical properties, and approximations are provided.
Date:
1949
Creator:
United States. National Bureau of Standards. Computation Laboratory.
Object Type:
Report
System:
The UNT Digital Library
Theoretical analysis of oscillations of a towed cable
Report presenting a theoretical study of the oscillations of a towed cable, which indicated that oscillations traveling downwind along the cable are amplified by aerodynamic forces when the airspeed is greater than the speed of propagation of waves along the cable. The theory provides a possible explanation for the violent motions of towed airspeed heads which appear above a certain speed.
Date:
1949
Creator:
Phillips, William H.
Object Type:
Report
System:
The UNT Digital Library
Theoretical characteristics in supersonic flow of two types of control surfaces on triangular wings
From Summary :"Methods based on the linearized theory for supersonic flow were used to find the characteristics of two types of control surfaces on thin triangular wings. The first type, the constant-chord partial-span flap, was considered to extend either outboard from the center of the wing or inboard from the wing tip. The second type, the full-triangular-tip flap, was treated only for the case in which the Mach number component normal to the leading edge is supersonic. For each type, expressions were found for the lift, rolling-moment, pitching-moment, and hinge-moment characteristics."
Date:
1949
Creator:
Tucker, Warren A. & Nelson, Robert L.
Object Type:
Report
System:
The UNT Digital Library
Theoretical Stability Derivatives of Thin Sweptback Wings Tapered to a Point With Sweptback or Sweptforward Trailing Edges for a Limited Range of Supersonic Speeds
Note presenting the stability derivatives valid for a limited range of supersonic speeds for a series of sweptback wings tapered to a point with sweptback or sweptforward trailing edges. The wings were derived by modifying the trailing edge of a basic triangular wing so that it coincided with lines drawn from the wing tips to the wing axis of symmetry.
Date:
January 1949
Creator:
Malvestuto, Frank S., Jr. & Margolis, Kenneth
Object Type:
Report
System:
The UNT Digital Library
Theory of the Inlet and Exhaust Processes of Internal-Combustion Engines
Note presenting a theory that has been developed for the calculation of the mass of fluid pumped per stroke and of indicator diagrams for the pumping process of internal-combustion engines, compressors, or vacuum pumps. The theory enables the volumetric efficiency and indicator diagrams for the inlet and exhaust processes of an internal-combustion engine to be obtained even before the engine is actually built. It is also possible to calculate some hypothetical inlet and exhaust processes which are impossible to obtain on actual engines, such as the cases where the valves open and close instantaneously.
Date:
January 1949
Creator:
Tsu, Tsung-Chi
Object Type:
Report
System:
The UNT Digital Library
Two-Dimensional Compressible Flow in Turbomachines With Conic Flow Surfaces
"A general method of analysis is developed for two-dimensional, steady, compressible flow in stators or rotors of radial and mixed flow turbomachines with conic flow surfaces (surfaces of right circular cones generated by center line of flow passage in the axial-radial plane). The variables taken into account are: (1) tip speed of the rotor, (2) flow rate, (3) blade shape, (4) variation in passage height with radius, (5) number of blades, and (6) cone angle of the flow surface. Relaxation methods are used to solve the nonlinear differential equation for the stream function" (p. 1).
Date:
1949
Creator:
Stanitz, John D.
Object Type:
Report
System:
The UNT Digital Library
Two Year Feeding Test
The following report presents the results of the second year of the two-year feeding tests of uranium compounds to 50 male and 50 female rats.
Date:
1949
Creator:
Maynard, Elliott A.; Downs, William L. & Hodge, Harold C.
Object Type:
Report
System:
The UNT Digital Library
United States Earthquakes, 1949
Report discussing earthquake activity in the United States during 1949. The report is broken down by regions and has sections for specific earthquakes.
Date:
1949
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Uranium Tetrafluoride (UF₄)
The following report analyzes the effects of uranium tetrafluoride on male and female rats within a two-year period.
Date:
1949
Creator:
Maynard, Elliott A.
Object Type:
Report
System:
The UNT Digital Library
Uranyl Fluoride (UO₂F₂)
This report analyzes the radiation effects of uranyl fluoride on groups of male and female rats within a period of two years.
Date:
1949
Creator:
Maynard, Elliott A.
Object Type:
Report
System:
The UNT Digital Library
Uranyl Nitrate Hexahydrate (UO₂(NO₃)2. 6H₂O)
This report follows investigations on the radiation effects of uranyl nitrate hexahydrate on groups of 15 to 25 male and female rats within a period of two years.
Date:
1949
Creator:
Maynard, Elliott A.
Object Type:
Report
System:
The UNT Digital Library
Water Pools in Pennsylvania Anthracite Mines
Report issued by the Bureau of Mines discussing water pools that accumulate in Pennsylvania anthracite mines. Factors that lead to underground water pools, and methods for water drainage are presented. This report includes tables, maps, illustrations, and photographs.
Date:
1949
Creator:
Ash, S. H.; Eaton, W. L.; Hughes, Karl; Romischer, W. M. & Westfield, J.
Object Type:
Report
System:
The UNT Digital Library
Wind-Tunnel Investigation of an NACA 65-210 Semispan Wing Equipped With Circular Plug Ailerons and a Full-Span Slotted Flap
Note presenting a wind-tunnel investigation made of the lateral-control characteristics of a thin, low-drag, semispan wing equipped with three configurations of circular plug ailerons and a full-span, 25-percent-chord, slotted flap. The investigation was performed through a Mach number range of 0.13 to 0.61. Results regarding wing aerodynamic characteristics, aileron control characteristics, comparison of lateral-control characteristics of the three configurations of circular plug aileron, comparison of lateral-control characteristics of the circular plug ailerons, a conventional plug aileron, and a retractable aileron, and a comparison of lateral-control characteristics of the circular plug ailerons with those of a sealed plain aileron are provided.
Date:
January 1949
Creator:
Fischel, Jack
Object Type:
Report
System:
The UNT Digital Library
Wind-tunnel investigation of the spinning characteristics of a model of a twin-tail low-wing personal-owner-type airplane with linked and unlinked rudder and aileron controls
Report presenting a spin investigation in the 20-foot free-spinning tunnel of a model of a twin-tail low-wing personal-owner-type airplane with linked and unlinked rudder and aileron controls. The model was tested for two wing loadings and three mass distributions. When the rudders and ailerons were linked for two-control operation, the model generally would not spin.
Date:
January 1949
Creator:
Klinar, Walter J. & Gale, Lawrence J.
Object Type:
Report
System:
The UNT Digital Library