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5,751 Matching Results
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[2012.201.B0413.0233]
Photograph is of a man in a baseball uniform, smiling and shaking the hand of another person.
Date:
May 1, 1946
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Sinusoidal machine.
"These instructions are published for the information and guidance of all personnel charged with the operation and maintenance of the McIntosh Electric Corporation Model No. 5018 of Sinusoidal Machine, Portable, for Galvanic, Faradic and Rapid Sinusoidal Currents, 110-Volt, 60-Cycle, Medical Department item No. 7132005 ... in the field. They contain information on the operation and maintenance of the equipment ...."
Date:
September 1, 1944
Creator:
United States. War Department.
Object Type:
Book
System:
The UNT Digital Library
Aircraft radio shop practice.
Discusses maintenance and repair of the component parts of aircraft radio equipment, and the correct use of tools.
Date:
May 1, 1942
Creator:
United States. War Department.
Object Type:
Book
System:
The UNT Digital Library
Experimental Physics Division of the Los Alamos Project. Progress report No. 4
Included in this semi-monthly report written in 1943 are progress with neutron beams, neutron absorption in enriched materials, equipment operation and maintenance reports of the cyclotron neutron source facility, and instrumentation maintenance activities of individuals in the cyclotron group. (GHT)
Date:
September 1, 1943
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
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
Experiments of the Effect of Atomic Electrons on the DecayConstant of Be7
In an attempt to detect a possible influence of the atomic electrons on the radioactive decay constant of Be{sup 7} they have measured {lambda}{sub Be}-{lambda}{sub BeO} and found (-3.0 {+-} 1.8) 10{sup -4} {lambda}{sub Be}. They describe also a method to measure mean lives of radioactive substances in a time short compared with the mean life.
Date:
July 1, 1948
Creator:
Segre, Emilio & Wiegand, Clyde
Object Type:
Report
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
Artificial Collateral Chains to the Thorium and ActiniumFamilies
The authors have produced and identified two new series of alpha-particle emitting radioactive elements; one is a 'collateral' branch of the actinium (4n + 3) radioactive family and the other is collateral to the thorium (4n) family. The series are of considerable interest in that they are the first whose early members lie on the neutron deficient side of beta stability. They have been produced in high yield of irradiation of thorium with deuterons of energy about {sup 80}Mev in the Berkeley 184-inch cyclotron. So far as the present observations are concerned both of these series begin with isotopes of protactinium (atomic number 91), although progenitors with higher atomic numbers are to be expected and will possibly be produced and identified. These protactinium isotopes are Pa{sup 227} and Pa{sup 228} formed by d,7n and d,6n reactions respectively.
Date:
July 1, 1948
Creator:
Ghiorso, A.; Meinke, W. W. & Seaborg, G. T.
Object Type:
Report
System:
The UNT Digital Library
Monthly Progress Report No. 60 for April 1948
This report gives a short summary of each of the following programs: (1) 184-inch Cyclotron Program; (2) 60-inch Cyclotron Program; (3) Synchrotron Program; (4) Linear Accelerator Program; (5) Experimental Physics; (6) Theoretical Physics; (7) Chemistry; (8) Medical Physics; and (9) Health Physics and Chemistry.
Date:
May 1, 1948
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Monthly Progress Report No. 58 for February 1948
This is a monthly progress report on the following programs: (1) 184-inch Cyclotron; (2) 60-inch Cyclotron; (3) Synchrotron; (4) Linear Accelerator; (5) Experimental Physics; (6) Theoretical Physics; (7) Isotope Research; (8) Chemistry; (9) Medical Physics; and (10) Health Physics and Chemistry.
Date:
February 1, 1948
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Path of Carbon in Photosynthesis III
Although the overall reaction of photosynthesis can be specified with some degree of certainty (CO{sub 2} + H{sub 2}O + light {yields} sugars + possibly other reduced substances), the intermediates through which the carbon passes during the course of this reduction have, until now, been largely a matter of conjecture. The availability of isotopic carbon, that is, a method of labeling the carbon dioxide, provides the possibility of some very direct experiments designed to recognize these intermediates and, perhaps, help to understand the complex sequence and interplay of reactions which must constitute the photochemical process itself. The general design of such experiments is an obvious one, namely the exposure of the green plant to radioactive carbon dioxide and light under a variety of conditions and for continually decreasing lengths of time, followed by the identification of the compounds into which the radioactive carbon is incorporated under each condition and time period. From such data it is clear that in principle, at least, it should be possible to establish the sequence of compounds in time through which the carbon passes on its path from carbon dioxide to the final products. In the course of shortening the photosynthetic times, one times, one …
Date:
June 1, 1948
Creator:
Benson, A. A. & Calvin, M.
Object Type:
Report
System:
The UNT Digital Library
Monthly Progress Report No. 59 for March 1948
This monthly progress report covers the following programs: (1) 184-inch Cyclotron; (2) 60-inch Cyclotron; (3) Synchrotron; (4) Linear Accelerator; (5) Experimental Physics; (6) Theoretical Physics; (7) Chemistry; (8) Medical Physics; and (9) Health Physics and Chemistry.
Date:
March 1, 1948
Creator:
unknown
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
The El Reno Daily Tribune (El Reno, Okla.), Vol. 54, No. 80, Ed. 1 Friday, June 1, 1945
Daily newspaper from El Reno, Oklahoma that includes local, state, and national news along with advertising.
Date:
June 1, 1945
Creator:
Dyer, Ray J.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The El Reno Daily Tribune (El Reno, Okla.), Vol. 51, No. 80, Ed. 1 Monday, June 1, 1942
Daily newspaper from El Reno, Oklahoma that includes local, state, and national news along with advertising.
Date:
June 1, 1942
Creator:
Dyer, Ray J.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The El Reno Daily Tribune (El Reno, Okla.), Vol. 52, No. 106, Ed. 1 Thursday, July 1, 1943
Daily newspaper from El Reno, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 1, 1943
Creator:
Dyer, Ray J.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The El Reno Daily Tribune (El Reno, Okla.), Vol. 53, No. 80, Ed. 1 Thursday, June 1, 1944
Daily newspaper from El Reno, Oklahoma that includes local, state, and national news along with advertising.
Date:
June 1, 1944
Creator:
Dyer, Ray J.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The El Reno Daily Tribune (El Reno, Okla.), Vol. 56, No. 130, Ed. 1 Friday, August 1, 1947
Daily newspaper from El Reno, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 1, 1947
Creator:
Dyer, Ray J.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The El Reno Daily Tribune (El Reno, Okla.), Vol. 55, No. 105, Ed. 1 Monday, July 1, 1946
Daily newspaper from El Reno, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 1, 1946
Creator:
Dyer, Ray J.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The El Reno Daily Tribune (El Reno, Okla.), Vol. 51, No. 260, Ed. 1 Friday, January 1, 1943
Daily newspaper from El Reno, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 1, 1943
Creator:
Dyer, Ray J.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The El Reno Daily Tribune (El Reno, Okla.), Vol. 54, No. 131, Ed. 1 Wednesday, August 1, 1945
Daily newspaper from El Reno, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 1, 1945
Creator:
Dyer, Ray J.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The El Reno Daily Tribune (El Reno, Okla.), Vol. 52, No. 158, Ed. 1 Wednesday, September 1, 1943
Daily newspaper from El Reno, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 1, 1943
Creator:
Dyer, Ray J.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The El Reno Daily Tribune (El Reno, Okla.), Vol. 54, No. 105, Ed. 1 Sunday, July 1, 1945
Daily newspaper from El Reno, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 1, 1945
Creator:
Dyer, Ray J.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The El Reno Daily Tribune (El Reno, Okla.), Vol. 49, No. 27, Ed. 1 Monday, April 1, 1940
Daily newspaper from El Reno, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 1, 1940
Creator:
Dyer, Ray J.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History