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  Partner: UNT Libraries Government Documents Department
 Decade: 1940-1949
 Year: 1948
N-17, A Delayed Neutron Emitter

N-17, A Delayed Neutron Emitter

Date: November 5, 1948
Creator: Alvarez, L. W.
Description: The decay scheme of a 4.2 second neutron emitter has been investigated in detail. Chemical and physical evidence shows that it is N{sup 17}, which emits beta rays to a broad excited state of O{sup 17}, which then breaks up into a neutron plus O{sup 16}. The energy spectrum of the neutrons is determined by measuring the energies of the O{sup 16} recoils in a proportional counter. The neutrons have a most probable energy of 0.9 Mev, a 'half width' of less than .5 Mev, and an upper limit of about 2 Mev. {beta}-recoil coincidences are observed, as predicted by the Bohr-Wheeler theory, and the {beta}-ray energy is measured by absorption. The beta rays in coincidence with neutrons have an upper limit of 3.7 {+-} 0.2 Mev. Beta-rays directly to the ground stat of O{sup 17} are not observed because of high background effects, but should have an energy of 8.7 Mev. Some evidence is presented to show that energy is conserved in the {beta}-n transition through the broad excited state in O{sup 17}.
Contributing Partner: UNT Libraries Government Documents Department
200 areas contaminated particle discharge

200 areas contaminated particle discharge

Date: December 15, 1948
Creator: unknown
Description: Short communication.
Contributing Partner: UNT Libraries Government Documents Department
234-5 Project specification letter 234-41, 235-41 (Supplement D), Chemical Development Laboratory

234-5 Project specification letter 234-41, 235-41 (Supplement D), Chemical Development Laboratory

Date: October 22, 1948
Creator: Work, J.B.
Description: This letter itemizes the miscellaneous equipment and supplies not previously specified which should be ordered to equip the 234-5 Chemical Development Laboratory. Equipment currently carried in store stock is not included in this list. The vendor is given only to identify the item or as a suggested source of supply.
Contributing Partner: UNT Libraries Government Documents Department
234-5 Project ventilation specifications

234-5 Project ventilation specifications

Date: July 13, 1948
Creator: Work, J.B.
Description: This brief memo from the 300 area of the Hanford plant, July 13, 1948, describes the need to redesign the ventilation system so as to minimize hazards associated with performing maintenance work.
Contributing Partner: UNT Libraries Government Documents Department
Accuracy of airspeed measurements and flight calibration procedures

Accuracy of airspeed measurements and flight calibration procedures

Date: 1948
Creator: Huston, Wilber B
Description: The sources of error that may enter into the measurement of airspeed by pitot-static methods are reviewed in detail together with methods of flight calibration of airspeed installations. Special attention is given to the problem of accurate measurements of airspeed under conditions of high speed and maneuverability required of military airplanes. (author).
Contributing Partner: UNT Libraries Government Documents Department
The Activity of the Coolant in Closed-Cycle Systems

The Activity of the Coolant in Closed-Cycle Systems

Date: September 7, 1948
Creator: Feld, B. T.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Additional abstracts pertaining to seaplanes

Additional abstracts pertaining to seaplanes

Date: March 9, 1948
Creator: Bidwell, J. M. & King, D. A.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Additional design tasks for 234-5 Project

Additional design tasks for 234-5 Project

Date: September 24, 1948
Creator: unknown
Description: Short communication.
Contributing Partner: UNT Libraries Government Documents Department
Additional free-flight tests of the rolling effectiveness of several wing-spoiler arrangements at high subsonic, transonic, and supersonic speeds

Additional free-flight tests of the rolling effectiveness of several wing-spoiler arrangements at high subsonic, transonic, and supersonic speeds

Date: November 24, 1948
Creator: Strass, H Kurt
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Additional results in a free-flight investigation of control effectiveness of full-span, 0.2-chord plain ailerons at high subsonic, transonic, and supersonic speeds to determine some effects of wing sweepback, aspect ratio, taper, and section thickne

Additional results in a free-flight investigation of control effectiveness of full-span, 0.2-chord plain ailerons at high subsonic, transonic, and supersonic speeds to determine some effects of wing sweepback, aspect ratio, taper, and section thickne

Date: April 23, 1948
Creator: Sandahl, Carl A & Strass, H Kurt
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Aerodynamic characteristics at high speeds of a two-blade NACA 10-(3)(062)-045 propeller and of a two-blade NACA 10-(3)(08)-045 propeller

Aerodynamic characteristics at high speeds of a two-blade NACA 10-(3)(062)-045 propeller and of a two-blade NACA 10-(3)(08)-045 propeller

Date: October 1, 1948
Creator: Solomon, William
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Aerodynamic characteristics at high speeds of full-scale propellers having Clark Y blade sections

Aerodynamic characteristics at high speeds of full-scale propellers having Clark Y blade sections

Date: October 26, 1948
Creator: Johnson, Peter J
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Aerodynamic characteristics at subsonic and supersonic Mach numbers of a thin triangular wing of aspect ratio 2 I : maximum thickness at 20 percent of the chord

Aerodynamic characteristics at subsonic and supersonic Mach numbers of a thin triangular wing of aspect ratio 2 I : maximum thickness at 20 percent of the chord

Date: November 19, 1948
Creator: Berggren, Robert E & Summers, James L
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Aerodynamic characteristics at subsonic and supersonic Mach numbers of a thin triangular wing of aspect ratio 2 II : maximum thickness at midchord

Aerodynamic characteristics at subsonic and supersonic Mach numbers of a thin triangular wing of aspect ratio 2 II : maximum thickness at midchord

Date: December 3, 1948
Creator: Walker, Harold J & Berggren, Robert E
Description: The lift, drag, and pitching-moment characteristics of a triangular wing, having an aspect ratio of 2 and a symmetrical double-wedge profile of 5-percent-chord maximum thickness at midchord, have been evaluated from wind-tunnel tests at Mach numbers from 0.50 to 0.975 and from 1.09 to 1.49 and at Reynolds numbers ranging from 0.67 to 0.85 million. The lift, drag, and pitching-moment coefficients of the triangular wing with a leading-edge sweepback of approximately 63 degrees did not exhibit the irregular variations with Mach number at high subsonic and low supersonic Mach numbers that are characteristic of unswept wings. The lift-curve slope increased steadily with Mach number below unity and declined slowly beyond the Mach number of 1.13. A substantial rise in the minimum drag coefficient occurred between Mach numbers of 0.95 and 1.20 with an associated reduction in the maximum lift-drag ratio. The aerodynamic center shifted rearward toward the centroid of area of the wing with increasing Mach number below 0.975; whereas above 1.09 it coincided with the centroid.
Contributing Partner: UNT Libraries Government Documents Department
Aerodynamic characteristics of a number of modified NACA four-digit-series airfoil sections

Aerodynamic characteristics of a number of modified NACA four-digit-series airfoil sections

Date: June 1948
Creator: Loftin, Laurence K , Jr & Cohen, Kenneth S
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Aerodynamic characteristics of a two-blade NACA 10-(3)(08)-03R propeller

Aerodynamic characteristics of a two-blade NACA 10-(3)(08)-03R propeller

Date: September 2, 1948
Creator: Evans, Albert J & Salters, Leland B , Jr
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Aerodynamic characteristics of a two-blade NACA 10-(3)(12)-03 propeller

Aerodynamic characteristics of a two-blade NACA 10-(3)(12)-03 propeller

Date: August 30, 1948
Creator: Allis, A E & Gray, W H
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Aerodynamic characteristics of flying-boat hulls having length-beam ratios of 20 and 30

Aerodynamic characteristics of flying-boat hulls having length-beam ratios of 20 and 30

Date: November 10, 1948
Creator: Riebe, John M
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Aerodynamic characteristics of several NACA airfoil sections at seven Reynolds numbers from 0.7 x 10(exp 6) to 9.0 x 10(exp 6)

Aerodynamic characteristics of several NACA airfoil sections at seven Reynolds numbers from 0.7 x 10(exp 6) to 9.0 x 10(exp 6)

Date: May 27, 1948
Creator: Loftin, Laurence K , Jr & Poteat, M Irene
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Aerodynamic characteristics of two all-movable wings tested in the presence of a fuselage at a Mach number of 1.9

Aerodynamic characteristics of two all-movable wings tested in the presence of a fuselage at a Mach number of 1.9

Date: October 28, 1948
Creator: Conner, D William
Description: None
Contributing Partner: UNT Libraries Government Documents Department
The aerodynamic effects of rockets and fuel tanks mounted under the swept-back wing of an airplane model

The aerodynamic effects of rockets and fuel tanks mounted under the swept-back wing of an airplane model

Date: April 23, 1948
Creator: Boddy, Lee E & Morrill, Charles P , Jr
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Aerodynamic properties of slender wing-body combinations at subsonic, transonic, and supersonic speeds

Aerodynamic properties of slender wing-body combinations at subsonic, transonic, and supersonic speeds

Date: July 1948
Creator: Spreiter, John R
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Aerodynamic study of a wing-fuselage combination employing a wing swept back 63 degrees : subsonic Mach and Reynolds number effects on the characteristics of the wing and on the effectiveness of an elevon

Aerodynamic study of a wing-fuselage combination employing a wing swept back 63 degrees : subsonic Mach and Reynolds number effects on the characteristics of the wing and on the effectiveness of an elevon

Date: October 11, 1948
Creator: Reynolds, Robert M & Smith, Donald W
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Aerodynamics characteristics of 24 NACA 16-series airfoils at Mach numbers between 0.3 and 0.8

Aerodynamics characteristics of 24 NACA 16-series airfoils at Mach numbers between 0.3 and 0.8

Date: September 1948
Creator: Lindsey, W F; Stevenson, D B & Daley, Bernard N
Description: None
Contributing Partner: UNT Libraries Government Documents Department
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