578 Matching Results

Search Results

School lunches in country and city.

Description: Discusses the importance of the development and implementation of school lunch programs in both rural and urban schools.
Date: March 1942
Creator: Sherman, Caroline B. (Caroline Baldwin); Southworth, Herman M. (Herman McDowell), 1909- & Klayman, Maxwell Irving, 1917-
Partner: UNT Libraries Government Documents Department

World Survey of Tantalum Ore

Description: Report issued by the U.S. Bureau of Mines discussing the occurrences of tantalum in different areas of the world. The tantalum deposits are described in reference to each individual country that it is found in. This report includes maps, tables, and illustrations.
Date: March 1945
Creator: Baker, James S.
Partner: UNT Libraries Government Documents Department

The Activator, Volume 1, Number 6, March 1945

Description: This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. Published monthly during long academic semesters.
Date: March 1945
Creator: American Chemical Society. Dallas/Fort Worth Section.
Partner: UNT Libraries

[Observation on machining speeds and feeds]

Description: This memorandum describes a trip on February 17th, 1944, in which the author stopped at the Baker Brothers Machine Company in Toledo to get the latest information on machining speeds and feeds and to determine the validity of their reported three pieces per hour per machine. The Baker Brothers reported that the three pieces per hour figure is an average given for determining delivery dates and allows for machining shapes other than a straight cylinder. They recommended a speed of 360 RPM for turning with a .010 feed.
Date: March 2, 1944
Partner: UNT Libraries Government Documents Department

The solution chemistry of polonium (Ad Interim Report)

Description: This document is a March 1949 Ad Interim Report from the Mound Laboratory on the solution chemistry of polonium. A consideration of the valences of the elements of the Group VI-A would indicate that the oxidation states of -2, 2, 4, and 6 might be expected for polonium. From the decrease in stability of the hydrides of these elements with increase in atomic number, one would expect that the compound H{sub 2} Po would be very unstable and that the oxidation state of -2 would not occur in solution. Furthermore, the stability of the oxidation state +6 as well as the stability of the highest oxidation state of a given element decreases as the atomic number increases in Group VI-A and Period VI respectively. For these reasons, the oxidation state +6 for polonium would be expected to occur only in a strongly oxidizing medium. The +4 state would be expected to be stable. The work discussed herein indicates that polonium exists as PoO{sup ++} in a nonoxidizing or reducing medium.
Date: March 22, 1949
Creator: Haring, M.M.
Partner: UNT Libraries Government Documents Department

Resistivity of polonium (Ad Interim)

Description: Apparatus for measuring the resistivity of polonium is described. This equipment has been built and tested. No resistivity measurements were made, however, because the method of determining the purity of the sample has not been perfected.
Date: March 9, 1949
Creator: Haring, M.M.
Partner: UNT Libraries Government Documents Department

Crystal structure of polonium and its decay products

Description: X-ray diffraction patterns have been obtained from a sample of elemental polonium over a period of more than four half-lives. This time study was made for the purpose of determining the effect of decay upon the lattice constants and crystal structure of the element.
Date: March 1, 1948
Creator: Haring, M.M.
Partner: UNT Libraries Government Documents Department

Limitations and past applications of the cloud chamber

Description: The cloud chamber is a means of observing the path of ionizing radiation. It does not reveal the radiation directly, but gives a visible trail of the path along which the radiation has traveled. The trail is formed by vapor condensing upon pairs of ions remaining after an ionizing particle has passed through the medium. The mutual interaction among rays, atoms, nuclei, and particles, can be studied and measured with the aid of vapor trails. Measurements of changes in direction and range as recorded on the photographs may be interpreted in terms of changes in momentum and energy of the particles in these reactions. To obtain a precision measurement is difficult with a cloud chamber. The dependence of the apparatus upon a sudden gas expansion is certain to create distortions resulting from turbulence. Furthermore, since any radiation is subject to variations, precision measurements can be obtained only be the collection of numerous observations for statistical analysis. This document details the design, operation, and limitations of cloud chambers.
Date: March 23, 1949
Creator: Chaplin, R.L. Jr.
Partner: UNT Libraries Government Documents Department

Preparation of bismuth powder

Description: The principal object of this report is to record results of tests made on equipment installed in Room 232 of ``T`` Building and used to prepare bismuth powder for process operations. Another object is to establish the most favorable operating conditions for the equipment and to prepare operating instructions therefor.
Date: March 8, 1949
Creator: Cox, G.C.; Grasso, J.A.; Hale, D. & Wright, J.W.
Partner: UNT Libraries Government Documents Department

Determination of the purity of polonium by means of the vacuum balance (Ad Interim Report)

Description: The assay technique is discussed in detail. The results of three purity determinations are: 94.92 per cent, 100.50 per cent, and 106.9 per cent. The errors present in each determination are stated. The inherent dangers in the present procedure are pointed out, and an improved method is outlined.
Date: March 8, 1949
Creator: Haring, M.M.
Partner: UNT Libraries Government Documents Department

Radiotelephone procedure

Description: "The purpose of this manual is to acquaint radio operators and pilots of the Army Air Forces with radiotelephone procedure"
Date: March 20, 1943
Creator: United States. War Department.
Partner: UNT Libraries Government Documents Department

Umpire manual.

Description: Describes procedures to be used by umpires in military exercises used in the training of ground forces.
Date: March 31, 1944
Creator: United States. War Department.
Partner: UNT Libraries Government Documents Department

The Activator, Volume 2, Number 6, March 1946

Description: This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. Published monthly during long academic semesters. This is the directory issue.
Date: March 1946
Creator: American Chemical Society. Dallas/Fort Worth Section.
Partner: UNT Libraries

Southwest Retort, Volume 1, Number 6, March 1949

Description: This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. Published monthly during long academic semesters.
Date: March 1949
Creator: American Chemical Society. Dallas/Fort Worth Section.
Partner: UNT Libraries