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1,535 Matching Results
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The Eight New Synthetic Elements
In an early continuation of the investigation of the radioactive isotopes of element number 43 (technetium) Segre and Seaborg produced by the deuteron and neutron bombardment of molybdenum the isotope Tc{sup 99}, which they observed to decay by means of an isomeric transition with a half-life of 6.6 hours to a lower isomeric state with a half-life greater than 40 years. The upper isomeric state of this isotope was observed by Segre and C. S. Wu to be produced in the fission of uranium and more recently R. P. Schumann and also D. C. Lincoln and W. H Sullivan working on the Plutonium Project of the Manhattan District have independently observed the beta-particles of half-life about 10 years due to the lower isomeric state. Later work by E. E. Motta and G. E. Boyd sets a more accurate value of 9.4 x 10{sup 5} years for this half-life. Since this isotope is formed in rather large amounts, namely, a fission yield of 6.2%, in the slow neutron induced fission of uranium it is now possible to isolate technetium in weighable amounts and in rather substantial quantities. For example, a uranium pile operating at a power level of 10{sup 5} kw …
Date:
November 1, 1947
Creator:
Seaborg, Glenn T.
Object Type:
Article
System:
The UNT Digital Library
Phosphorus Turnover and Photosynthesis
The participation of phosphorus in biological oxidation-reduction reactions of the type found in glycolysis ADP + PO{sub 4}H{sup -} + 3-phosphoglyceraldehyde + DPN{sup +} = 3-phosphoglycerate{sup -} + 2H{sup +} + DPNH + ATP has suggested theories in which similar reactions are proposed for photosynthesis. In these theories the reducing power of photosynthesis is utilized not only for reduction of carbon dioxide but also, by means of coupled oxidations, for the generation of high-energy phosphate bonds, or in the last reference directly for the generation of high-energy phosphate. Since in these theories acyl phosphate is formed from inorganic phosphate, they are amenable to proof without isolation of particular intermediates, by means of radioactive phosphorus. It would be expected that the rate of conversion of inorganic phosphate to organic phosphate would be greater in light than in the dark. They have investigated this possibility under a variety of conditions and are unable to substantiate the theories.
Date:
November 1, 1947
Creator:
Aronoff, Sam & Calvin, Melvin
Object Type:
Report
System:
The UNT Digital Library
Diffraction Effects in Neutron Attenuation Measurements
All errors due to diffraction effects in a neutron attenuation experiment are computed. Also a special experiment to measure the forward intensity of diffracted neutrons from lead and copper is described, and the results given. These agree with the theoretical values.
Date:
November 1, 1947
Creator:
McMillan, E. M. & Sewell, D. C.
Object Type:
Report
System:
The UNT Digital Library
200 Area monthly reports, July--December 1947
This document presents the monthly reports of the 200 area technical group for July--December, 1947. (KS)
Date:
January 1, 1947
Creator:
Stanford, R.E.L. & Christy, J.T.
Object Type:
Report
System:
The UNT Digital Library
Problems of Air-Borne Contamination in Handling of Pu Fâ‚„ Powders
Abstract: Studies were made of the air-borne contamination present during the operation of reducing plutonium tetrafluoride powder to the metal. Equipment design changes were made and operation technique changes were made until the amount of contamination present during operations was well below tolerance levels.
Date:
July 31, 1947
Creator:
Kennedy, William R.; Dumrose, A. & Ludwig, A.
Object Type:
Report
System:
The UNT Digital Library
Fraunhofer Diffraction Pattern Produced by a Slit of Varying Width and its Application to High Speed Cameras
Abstract: "A theoretical and experimental investigation is made of the diffraction pattern produced by a slit, whose aperture varies uniformly from a constant value A to zero. The results of this investigation are applied to a proposed high speed camera. It is shown that diffraction effects are very serious and cannot be neglected. It seems, unless the suggested design of this high speed camera is changed, the camera will be of little use for accurate measurements, and photographs will show too much blue to give details."
Date:
November 11, 1947
Creator:
Geiger, F. E. & Brixner, Berlyn
Object Type:
Report
System:
The UNT Digital Library
A Method for Rolling Uranium Foil
"This report gives briefly a rather simple method for fabricating foils from uranium buttons. Two log sheets one of a U-238 run and one of a U-255 run are given."
Date:
October 21, 1947
Creator:
Bernard, George L., (Jr.)
Object Type:
Report
System:
The UNT Digital Library
Topical Report on Chemical Process to Recover Uranium from Phosphate Rock
The following report summarizes research done on dissolving uranium from phosphate rock and superphosphate and recovering it from solution in a more concentrated form.
Date:
November 15, 1947
Creator:
Igelsrud, Iver
Object Type:
Report
System:
The UNT Digital Library
Beta-Counting Methods Applied to the Determination of Uranium in Low-Grade Ores
The following report covers investigations on the application of the beta counter as an analytical tool for use in experiments on the extraction and concentration of uranium from low-grade (.005-.02 % uranium) shale and phosphate rock ores.
Date:
July 1947
Creator:
Doig, J. R.; Igelsrud, Iver; Nelson, H. R. & Schwartz, C. M.
Object Type:
Report
System:
The UNT Digital Library
Survey of Los Alamos and Pueblo Canyon for Radioactive Contamination and Radio Assay Tests Run on Sewer-Water Samples and Water and Soil Samples Taken From Los Alamos and Pueblo Canyons
"Report of the Survey of Los Alamos and Pueblo Canyon for radioactive contamination and radioassay tests run on sewer water samples and water and soil samples taken from Los Alamos and Pueblo Canyons." The objective of this report was to determine the extent and sources of radioactive contamination in the areas studied.
Date:
February 20, 1947
Creator:
Kingsley, William H.; Fox, Alvin; Tribby, J. F. & Doner, Elmer
Object Type:
Report
System:
The UNT Digital Library
Calculation of end points in potentiometric analyses
From introduction: "It is the purpose of this report to give two further methods of determining end point of pontentiometric titration, neither of which require the plotting of a graph."
Date:
October 6, 1947
Creator:
Bennett, Carl A.
Object Type:
Report
System:
The UNT Digital Library
Preliminary Report on Existing Active Particle Hazard-200 Areas
"Recent surveys by the Health Instrument Section have disclosed the presence of many small radioactive spots on ground surfaces in the T and B plant areas. Investigation has shown that representative samples of the spots when mechanically separated invariably end in a single radioactive particle."
Date:
October 22, 1947
Creator:
Mickelson, M. L.
Object Type:
Report
System:
The UNT Digital Library
Action Taken on the Spot Contamination in the Separations Plant Areas
The following document analyzes radioactive spot contamination in and around the T and B Plant Areas.
Date:
October 30, 1947
Creator:
Parker, H. M.
Object Type:
Report
System:
The UNT Digital Library
Freezing Point Data for UNH-H₂O-HNO₃ Systems
The following report follows a series of experiments on the freezing points of 25 UN-H2O-HNO3 solutions.
Date:
December 17, 1947
Creator:
Harmon, M. K.
Object Type:
Report
System:
The UNT Digital Library
Effect of Heat Treatment of the Structure and Hardness of Gamma Extruded Uranium : Final Report, Problem Assignment 2-M
The following document is an interim report on studies made to determine the optimum time-temperature treatment to produce a recrystallized grain structure in gamma extruded uranium."
Date:
December 24, 1947
Creator:
Padden, R. M.
Object Type:
Report
System:
The UNT Digital Library
Investigations on Reductions of Friction on Wings, in Particular by Means of Boundary Layer Suction
Memorandum presenting investigation on reductions of friction on wings, especially by means of boundary-layer suction. The report is broken up into several sections, including: causes of transition, laminar profiles with the transition taking place, laminar boundary-layer suction, investigation of the laminar pressure increase, investigation of the slot flow for laminar boundary-layer suction with single slots, tests about keeping a boundary layer for high Reynolds laminar with the aid of boundary-layer suction, and an investigation of a slightly-cambered laminar suction profile of 10.5-percent thickness.
Date:
August 1947
Creator:
Pfenninger, Werner
Object Type:
Report
System:
The UNT Digital Library
A flight investigation to increase the safety of a light airplane
Report presenting information about a series of modifications incorporated into light airplanes to increase safety, including decreasing the wing incidence, increasing the wing washout, increasing the area and aspect ratio of the horizontal and vertical tails, moving the elevators out of propeller slipstreams, depressing the thrust axis, and limiting the rudder travel. The new inherent safety characteristics and effects on the airplane's performance are provided.
Date:
March 1947
Creator:
Hunter, P. A. & Vensel, J. R.
Object Type:
Report
System:
The UNT Digital Library
Effect of Centrifugal Force on the Elastic Curve of a Vibrating Cantilever Beam
Report presenting the results of a study to determine the effect of rotation on the dynamic-stress distribution in vibrating cantilever beams. Both theoretical and experimental results are obtained by means of stroboscopic photographs and strain gauges. Both types of results indicated that the introduction of centrifugal force had no effect on the maximum dynamic-stress locations in a vibrating cantilever beam fixed at the center of rotation within the investigated speed range.
Date:
February 1947
Creator:
Simpkinson, Scott H.; Eatherton, Laurel J. & Millenson, Morton B.
Object Type:
Report
System:
The UNT Digital Library
Boundary-Induced Upwash for Yawed and Swept-Back Wings in Closed Circular Wind Tunnels
Report presenting a determination of the tunnel-induced velocities for yawed and swept-back airfoils in a closed circular wind tunnel. Calculations were performed for elemental horseshoe vortices with one tip of the bound vortex on the tunnel axis for a range of yaw angles and bound-vortex lengths.
Date:
May 1947
Creator:
Eisenstadt, Bertram J.
Object Type:
Report
System:
The UNT Digital Library
Data on Optimum Length, Shear Strength, and Tensile Strength of Age-Hardened 17S-T Machine-Countersunk Rivets in 75S-T Sheet
Report presenting a series of tensile-strength and shear-strength tests made on age-hardened 17S-T rivets machine-countersunk in 75S-T sheets. The results of the tests indicated that the joints can be made satisfactorily with regard to both flushness and strength if the ratio of buck to diameter is kept to a certain value.
Date:
March 1947
Creator:
Schuette, Evan H. & Niles, Donald E.
Object Type:
Report
System:
The UNT Digital Library
Flight Measurements of Helicopter Blade Motion With a Comparison Between Theoretical and Experimental Results
Note presenting photographic records of the behavior of a blade in flight as obtained with a conventional single-rotor helicopter. The results of the measurements of flapping motion, in-plane motion, and blade distortions are presented for selected conditions of flight at tip-speed ratios ranging from 0.12 to 0.25. Plots of blade twisting and blade bending in the plane of flapping are presented for a sample case.
Date:
April 1947
Creator:
Myers, Garry C., Jr.
Object Type:
Report
System:
The UNT Digital Library
The streamline pattern in the vicinity of an oblique airfoil
"A method for determining the streamwise flow pattern of a nonviscous incompressible fluid about an oblique airfoil from the corresponding flow pattern about the airfoil in normal position is presented and illustrated in two examples. The method can be extended to account approximately for compressibility effects by applying the Prandtl-Glauert correction factor to the flow pattern that is normal to the leading edge of the airfoil. The method is expected to be useful in determining the shape of a fuselage or nacelle having a minimum of interference with the flow over a swept-back wing" (p. 1).
Date:
March 1947
Creator:
Watkins, Charles E.
Object Type:
Report
System:
The UNT Digital Library
Flight Tests of a Helicopter in Autorotation, Including a Comparison With Theory
Note presenting the results of glide performance tests conducted on a test helicopter with its original production blades in the autorotation condition. The data was reduced to coefficient form, and performance at standard sea-level conditions were calculated.
Date:
April 1947
Creator:
Gessow, Alfred & Myers, Garry C., Jr.
Object Type:
Report
System:
The UNT Digital Library
Experimental and calculated characteristics of several NACA 44-series wings with aspect ratios of 8, 10, and 12 and taper ratios of 2.5 and 3.5
The aerodynamic characteristics of seven unswept tapered wings were determined by calculation from two-dimensional data and by wind-tunnel tests in order to demonstrate the accuracy of the calculations and to show some of the effects of aspect ratio, taper ratio, and root thickness-chord ratio. The characteristics were calculated by the usual application of the lifting-line theory which assumes linear section lift curves and also by an application of the theory which allows the use of nonlinear lift curves. A correction to the lift for the effect of chord was made by using the Jones edge-velocity factor. The wings had aspect ratios of 8, 10, and 12, taper ratios of 2.5 and 3.5, and NACA 44-series airfoils.
Date:
May 1947
Creator:
Neely, Robert H.; Bollech, Thomas V.; Westrick, Gertrude C. & Graham, Robert R.
Object Type:
Report
System:
The UNT Digital Library