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Activation Energy for Fission

Description: The experimentally determined exponential dependence of spontaneous fission rate on Z{sup 2}/A has been used to derive an expression for the dependence of the fission activation energy on Z{sup 2}/A. This expression has been used to calculate the activation energy for slow neutron induced fission and photofission. The correlation with the experimental data on these types of fission seems to be quite good.
Date: August 29, 1952
Creator: Seaborg, Glenn T.
Item Type: Refine your search to only Report
open access

Activation Energy for Fission

Description: Abstract: The experimentally determined exponential dependence of spontaneous fission rate on Z^2/A has been used to derive an expression for the dependence of the fission activation energy on Z^2/A. This expression has been used to calculate the activation energy for slow neutron induced fission and photofission. The correlation with the experimental data on these types of fission seems to be quite good.
Date: August 29, 1952
Creator: Seaborg, Glenn T.
Item Type: Refine your search to only Report
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Airborne Radioactivity Survey of Part of the Navajo Indian Reservation of Utah and Arizona

Description: From introduction: The purpose of an airborne radioactivity survey is to locate ground areas of higher than normal radioactivity which might lead to discovery of uranium mineralization. For this type of survey, gamma-ray detection equipment employing either a geiger counter or a scintillation counter can be mounted in a fixed wing aircraft or a helicopter.
Date: February 29, 1952
Creator: Cummings, Winthrop L.
Item Type: Refine your search to only Report
open access

Appendix to HDC 2118 design criteria 100-X reactor water plant, general description - section II

Description: The factors responsible for the advances of 100-X compared with the older areas are: Simplification of the process, such as elimination of separate process water clearwells, by having the filtered water reservoirs perform that function. Combination of separate buildings into one building, such as combining filter pump house and process pump house. Use of electric standby. Use of higher capacity pumps and filter basins, and so fewer number of units. Centralization of control and operation. More … more
Date: March 29, 1952
Item Type: Refine your search to only Report
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C-Pile recommended flow -- Pressure characteristic curve and orifice pattern

Description: Final approval of a flow-pressure characteristic curve and orifice pattern for C Pile is desired as soon as possible to allow the completion of orifice assemblies and parallit instrumentation. The presentation of a recommended flow-pressure curve and an orifice pattern has been delayed by a lack of experimental flow data on the C Pile flow system. Discussion with members of the C-431-B working committee and Pile Technology Unit personnel indicated that the use of flows higher than those recomme… more
Date: April 29, 1952
Creator: Spencer, H. G.
Item Type: Refine your search to only Report
open access

A comparison of the spanwise loading calculated by various methods with experimental loadings obtained on a 45 degrees sweptback wing of aspect ratio 8 at a Reynolds number of 4.0 x 10(exp 6)

Description: Report presenting experimental force and moment data obtained by pressure measurements on a wing of aspect ratio 8.02, 45 degree sweepback of the quarter-chord line, taper ratio of 0.45, and NACA 63(sub 1)A012 airfoil sections, which are compared with the calculated loadings obtained by standard methods and several variations of the methods. Results regarding the system of identifying solutions, spanwise load distribution, lift-curve slope, center of pressure, wing pitching moment, and induced … more
Date: January 29, 1952
Creator: Schneider, William C.
Item Type: Refine your search to only Report
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Effect of camber and twist on the stability characteristics of models having a 45 degree swept wing as determined by the free-fall method at transonic speeds

Description: Report presenting measurements in free fall at transonic speeds of the dynamic stability characteristics of three models. Two of the models had 45 degree swept wings of aspect ratio 6 and 45 degree swept tail surfaces and differed only in that one had plane wings and one was cambered and twisted. The third had the same fuselage-tail arrangement but no wing.
Date: August 29, 1952
Creator: White, Maurice D.
Item Type: Refine your search to only Report
open access

Force and Pressure Investigation at Large Scale of a 49 Degree Sweptback Semispan Wing Having NACA 65A006 Sections and Equipped With Various Slat Arrangements

Description: Report presenting an investigation to determine the effect of varying the span and deflection angle of a 15-percent-chord slat on the longitudinal aerodynamic characteristics of a semispan wing with 49.1 degrees of sweepback at the leading edge, an aspect ratio of 3.78, a taper ratio of 0.586, and NACA 65A006 airfoil sections. Force measurements and chordwise pressure distributions were obtained on the wing and extended slat with and without a deflected trailing-edge flap.
Date: January 29, 1952
Creator: Lipson, Stanley & Barnett, U. Reed, Jr.
Item Type: Refine your search to only Report
open access

Influence of fuselage-mounted rocket boosters on flow field at inlet and on diffuser performance of strut-mounted engine at Mach numbers of 1.8 and 2.0

Description: Report presenting an investigation of the effect of fuselage-mounted rocket boosters on a strut-mounted engine in the 8- by 6-foot supersonic wind tunnel at Mach numbers of 1.8 and 2.0. The boosters were pairs of circular cylinders with conical forebodies mounted on the top and bottom of the fuselage, and the engine was mounted on a horizontal strut. Results regarding the characteristics of the flow field, effect of putting the boosters in several positions, and effect of angle of attack are pr… more
Date: October 29, 1952
Creator: Wise, George A. & Obery, Leonard J.
Item Type: Refine your search to only Report
open access

Internal-film-cooling experiments with 2- and 4-inch smooth-surface tubes and gas temperatures to 2000 degrees Fahrenheit

Description: Report presenting an investigation of liquid-film cooling at a variety of air temperatures and Reynolds numbers. Results regarding the effect of coolant flow per circumferential length on liquid-cooled length, correlation of heat transfer from hot gas to liquid film for constant coolant flow per circumferential length, and generalized plot of film-cooling data based on heat-transfer correlation at constant coolant flow per circumferential length are provided.
Date: April 29, 1952
Creator: Kinney, George R.
Item Type: Refine your search to only Report
open access

Investigation of liquid fluorine and hydrazine-ammonia mixture in 100-pound-thrust rocket engine

Description: Report presenting the specific impulse, characteristic velocity, thrust coefficient, and heat rejection of liquid fluorine and a fuel consisting of a hydrazine-ammonia mixture for a range of fuel percentages in a 100-pound-thrust rocket engine designed for a combustion-chamber pressure of 300 pounds per square inch absolute. The fuel consisted of 59 percent hydrazine, 37 percent ammonia, and 4 percent water. The attainment of maximum performance with liquid fluorine as a rocket oxidant will req… more
Date: October 29, 1952
Creator: Ordin, Paul M.; Rothenberg, Edward A. & Rowe, William H.
Item Type: Refine your search to only Report
open access

Investigation of several techniques for improving altitude starting limits of turbojet engines

Description: Report presenting a study of the altitude-starting limits of a production turbojet engine with an axial-flow compressor and a multiple through-flow combustor. The ignition limits, flame-propagation limits, and acceleration limits of the engine were improved to increase the starting limits to relatively high altitude.
Date: October 29, 1952
Creator: Armstrong, John C. & Wilsted, H. D.
Item Type: Refine your search to only Report
open access

Investigation of Shinarump Channels on Oljetoh Mesa, Arizona - Utah

Description: From to the files: The Shinarump-Moenkopi contact on Oljetoh Mesa in the Monument Valley district, Arizona-Utah, was examined from November 5 to 15, 1951, to determine the location of and the mineralization in Shinarump channels. Twenty-seven distinct channel outcrops were located and examined. Three of these channel outcrops are mineralized and the remaining 24 are barren. Plate I shows the distribution of the Shinarump, the Moenkopi, and the DeChelly member of the Cutler formation; the locati… more
Date: January 29, 1952
Creator: Cutter, R. C.
Item Type: Refine your search to only Report
open access

Low-speed lateral-control characteristics of an unswept wing with hexagonal airfoil sections and aspect ratio 2.5 equipped with spoilers and with sharp- and thickened-trailing-edge flap-type ailerons at a Reynolds number of 7.6 x 10(exp 6)

Description: Report presenting the lateral-control characteristics of two spans of spoiler and flap-type ailerons on an unswept wing with an aspect ratio of 2.5 and hexagonal airfoil sections. Measurements of rolling moments, yawing moments, aileron hinge moments, normal forces, and balance-camber pressures for various configurations of the wing.
Date: April 29, 1952
Creator: Fitzpatrick, James E. & Woods, Robert L.
Item Type: Refine your search to only Report
open access

Mechanical Properties of Zirconium and Zirconium-Uranium Alloys Containing Tin

Description: Abstract: "The mechanical properties of a large number of zirconium alloys have been investigated. These alloys include zirconium-tin and zirconium-tin-uranium. Tensile tests have been run on these alloys at room temperature, 500 F, and 600 F. Hot-hardness data have been obtained from room temperature to 1600 F, with particular emphasis on the hot-rolling range. Creep tests and fatigue tests have been run on a number of zirconium-tin alloys at 500 F."
Date: September 29, 1952
Creator: Schwope, A. D.; Muehlenkamp, G. T. & Chubb, Walston
Item Type: Refine your search to only Report
open access

Mechanical Properties of Zirconium and Zirconium-Uranium Alloys Containing Tin

Description: Abstract: "The mechanical properties of a large number of zirconium alloys have been investigated. These alloys include zirconium-tin and zirconium-tin-uranium. Tensile tests have been run on these alloys at room temperature, 500 F, and 600 F. Hot-hardness data have been obtained from room temperature to 1600 F, with particular emphasis on the hot-rolling range. Creep tests and fatigue tests have been run on a number of zirconium-tin alloys at 500 F."
Date: September 29, 1952
Creator: Schwope, A. D.; Muehlenkamp, G. T. & Chubb, Walston
Item Type: Refine your search to only Report
open access

Modes of Acceleration of Ions in a 3-DEE Cyclotron.

Description: The analysis shows that a symmetrical three-dee cyclotron accelerating ions below relativistic velocities has the property that ions of different e/m rations can be accelerated without changing the frequency of the electrical power supplied to the dees or the value of the magnetic field. The energy gain per revolution of the ions which can be accelerated in the various modes are found, considering three identical dees of arbitrary angular widths. For these calculations it has been assumed tha… more
Date: February 29, 1952
Creator: Jakobson, M.; Heusinkveld, M. & Ruby, L.
Item Type: Refine your search to only Report
open access

On the Development of Turbulent Wakes From Vortex Streets

Description: "Wake development behind circular cylinders at Reynolds numbers from 40 to 10,000 was investigated in a low-speed wind tunnel. Standard hot-wire techniques were used to study the velocity fluctuations. The Reynolds number range of periodic vortex shedding is divided into two distinct subranges" (p. 1).
Date: May 29, 1952
Creator: Roshko, Anatol
Item Type: Refine your search to only Report
open access

Performance Characteristics of a Normal-Shock Side Inlet Located Downstream of a Canard Control Surface at Mach Numbers of 1.5 and 1.8

Description: The performance characteristics of a downward canted normal-shock side (scoop) inlet located downstream of a triangular control surface are presented for free-stream Mach numbers of 1.5 and 1.8 in terms of total pressure recovery and mass flow ratio for various boundary-layer removal systems, angles of attack, control surface deflections and adverse yaw. An engine operating condition for a hypothetical turbojet engine is established, and the match point characteristics of the engine-inlet confi… more
Date: July 29, 1952
Creator: Dryer, Murray & Beke, Andrew
Item Type: Refine your search to only Report
open access

Performance characteristics of canard-type missile with vertically mounted nacelle engines at Mach numbers 1.5 to 2.0

Description: Report of an investigation of the overall performance characteristics of a complete missile configuration in the 8- by 6-foot supersonic wind tunnel at several Mach numbers, angles of attack, canard-control-surface deflections, and a designated Reynolds number based on wing mean aerodynamic chord. The investigation showed that at a Mach number of 2.0, the addition of engines to a no-engine configuration increased drag and moved the aerodynamic center rearward but produced little additional lift… more
Date: September 29, 1952
Creator: Obery, Leonard J. & Krasnow, Howard S.
Item Type: Refine your search to only Report
open access

The Preparation of Beta Silicon Carbide

Description: This report explores the production of beta silicon carbide, a low-temperature, cubic modification of cubic silicon carbide. The temperature, heating time, type of starting material, and proportion of starting materials were all varied in order to test yields of beta silicon carbide.
Date: December 29, 1952
Creator: Gambino, J. R.; Mixer, W. G., Jr.; Wagner, H. E. & Harman, Cameron G.
Item Type: Refine your search to only Report
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