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Articles 181 - 191 of 191
Full-Text Articles in Physical Sciences and Mathematics
Internal Fissuring Of Wheat Due To Weathering, Max Milner, J. A. Shellenberger, M. R. Lee, Robert Katz
Internal Fissuring Of Wheat Due To Weathering, Max Milner, J. A. Shellenberger, M. R. Lee, Robert Katz
Robert Katz Publications
Radiographic technique developed at this Station for the determination of internal or hidden insect infestation in stored grain has proved to be useful for the detection of other physical anomalies in grains. Practical applications of this sort include the detection of cracked or broken kernels in rough rice (paddy) prior to milling as well as the extent of internal fracturing of certain grains such as maize due to uneven stresses arising from severe drying conditions. This communication deals with a condition of internal fissuring occurring in wheat due to weathering of the ripened grain in the field.
Radioactivity Of Eu152,154, Robert Katz, Milford R. Lee
Radioactivity Of Eu152,154, Robert Katz, Milford R. Lee
Robert Katz Publications
Although the spectrographic analysis accompanying several enriched samarium isotopes from Oak Ridge contained <0.6 percent europium, some of the more intense internal conversion lines attributed to the disintegration of europium have been found photographically with neutron-activated samarium isotopes in a 180° focusing β-ray spectrograph.
Radiography Applied To Grain And Seeds, Max Milner, Milford R. Lee, Robert Katz
Radiography Applied To Grain And Seeds, Max Milner, Milford R. Lee, Robert Katz
Robert Katz Publications
A radiographic method for the detection of internal insect infestation in grain by means of low energy radiation from a cobalt-target beryllium-window X-ray tube is described. The utility of the technic for inspection of wheat, corn, rice, and beans is illustrated with cuts made from original radiographs.
Radioactive Disintegration, Robert Katz
Radioactive Disintegration, Robert Katz
Robert Katz Publications
The conventional development of parent-daughter relationships in radioactive disintegration follows the treatment given in Rutherford, Chadwick, and Ellis in which a trial solution of the differential equations appropriate to the process is proposed, and the arbitrary constants are evaluated by application of boundary conditions. At the senior-graduate level at which the first course in nuclear physics is usually taught, the following derivation is believed to be considerably more instructive.
United States Patent: Antenna Guy Fitting, Robert Katz
United States Patent: Antenna Guy Fitting, Robert Katz
Robert Katz Publications
The invention to be hereinafter described relates to coupling devices for the attaching of fixed wire antenna to aircraft.
Heretofore, it has been the general practice to make connections between the fixed wire antenna and aircraft by wrapping the antenna wire about a thimble or like device, as in making a splice.
This practice resulted in a number of sharp points and rough surfaces whose susceptibility to corona discharge is well known. This corona discharge resulted in bad weather extremely difficult or dangerous due to interruption of radio navigation and communication services.
The present invention is designed to overcome the …
Application Of X-Ray Technique To The Detection Of Internal Insect Infestation Of Grain, Max Milner, Milford R. Lee, Robert Katz
Application Of X-Ray Technique To The Detection Of Internal Insect Infestation Of Grain, Max Milner, Milford R. Lee, Robert Katz
Robert Katz Publications
During the course of a comprehensive investigation of methods for the determination of internal insect infestation in commercial wheat, radiographic techniques have been developed at this station which provide satisfactory delineation of internal infestation. We have applied these techniques to the observation of the growth of such insects as granary weevil, Sitophilus granaries L., and rice weevil, Sitophilus oryza L., from the hatching of the egg within the kernel through larval and pupal growth to emergence as a mature insect. Although considerable detail is always lost in the reproduction of radiographs during engraving and printing, the accompanying figures (1, …
A Simple Experiment On Heat, Robert Katz
A Simple Experiment On Heat, Robert Katz
Robert Katz Publications
This experiment requires apparatus consisting of two ring stands, two bunsen burners, safety matches, a sheet of hard asbestos board and a sheet of aluminum of approximately the same dimensions (6 in. long by 3½ in. wide by ⅛ in. thick). The ring stands are set side-by-side with the sheet of aluminum on one and the sheet of asbestos on the other. Two matches are placed on each sheet; one in the middle directly above the bunsen burner and one on the edge, two or three inches away. In what order will the matches catch fire after the burners are …
Disintegration Of Te121 And Te123 Isomers, Robert Katz, R. D. Hill, M. Goldhaber
Disintegration Of Te121 And Te123 Isomers, Robert Katz, R. D. Hill, M. Goldhaber
Robert Katz Publications
Line intensities in the conversion electron spectra of Te121 and Te123 were evaluated in a variable field, 180° focusing beta-ray spectrograph. Electron-electron coincidences were obtained between the transition pairs 82-213 kev in Te121 and 88.5-159 kev in Te123. Decay schemes for the two isomers are shown.
United States Patent: Antenna Strain Insulator, Robert Katz
United States Patent: Antenna Strain Insulator, Robert Katz
Robert Katz Publications
The invention to be hereinafter described relates to insulators and more particularly to strain insulators for wire antennas.
It has long been common practice to use with antenna wires on airplanes the well known porcelain or ceramic insulator, the wire ends being looped through or about the insulator, and brought back and twisted about the wire to tie, anchor or securely attach or fasten the insulator to the antenna. The produces small wire-end surfaces or other small wire surfaces, where the wires are would or twisted, which under certain atmospheric conditions are favorable to corona discharges. When the corona discharge …
Corona Discharge From Antenna Wire: A First Partial Report, Robert Katz
Corona Discharge From Antenna Wire: A First Partial Report, Robert Katz
Robert Katz Publications
Purpose: 1. To examine the conditions for corona at the surface of a wire. This report is a theoretical discussion. No test procedure was used.
Conclusions:
1. Calculation of the gradient at the surface of the fixed-wire liaison antenna (bare copperweld, .040" diameter) on the B-17 airplane indicates that it is of the order of 200 times the gradient measured at the top generating voltmeter.
2. Further work will be done by the Special Devices Branch in an attempt to determine the conditions under which insulated wire goes into corona.
X-Ray Inspection Of Castings (Army Air Forces' Requirements), Robert Katz
X-Ray Inspection Of Castings (Army Air Forces' Requirements), Robert Katz
Robert Katz Publications
The author contributed a brief account of the radiographic practices necessary to comply with government specifications to a round table discussion on inspection methods at the last American Society for Metals Convention, and later was able to release for publication in Metal Progress a full set of the radiographic standards set up about a year ago to govern acceptance of structural castings for airplanes. Representaive negatives are reproduced in this article. Those eliminated are either of similar defects which did not register strong enough to appear on an engraving without retouching, or of defects readily observed by visual inspection without …