13 Matching Results

Search Results

Results: 1 - 13
open access

The Nuclear Reactor with a Transverse Air Gap

Description: Diffusion theory and transport theory approaches to the problem of a nuclear reactor with a transverse air gap are compared. It is suggested that the differences in results for thin gaps is due to the fact that diffusion theory does not adequately represent the flux distribution in the immediate vicinity of the gap. For mathematical conveniences previous treatments of the gap problem have made use of fictitious image piles which exaggerate the neutron losses. The extent of the error is estimate… more
Date: August 24, 1954
Creator: Chernick, J. & Kaplan, I.
Partner: UNT Libraries Government Documents Department
open access

Summary Hazards Report on Enriched Fuel Element Loading for the BNL Research Reactor

Description: Report issued by the Brookhaven National Laboratory discussing a hazards report on replacing the research center's current fuel elements with new highly enriched elements. As stated in the introduction, "this report is a summary of the studies, both theoretical and experimental, which have been made so far of the nuclear properties of the "new" pile, of the stability of the new fuel elements, and of the safety and practicability of operation of the "new" pile" (p. 2). This report includes table… more
Date: May 24, 1956
Creator: Corngold, N.; Kaplan, I.; Chernick, J.; Gurinsky, D. H. & Fowell, R. W.
Partner: UNT Libraries Government Documents Department
open access

The Use of Low Energy Radioactive Isotopes in The Examination of Paintings on Thin Supports

Description: The importance of the examination of paper and textile supported art objects by means of low energy X-rays has been ably discussed in the preceding papers of this session. The apparatus used for such radiography, however, has tended to be both expensive and confined to laboratory use. A lack of mobility arises from the weight and size of X-ray apparatus and the fact that its installation frequently requires shielding and special electric power lines. An inexpensive radiographic apparatus that r… more
Date: December 24, 1963
Creator: Sayre, E. V.
Partner: UNT Libraries Government Documents Department
open access

Manganese Poisoning - New Insights

Description: The heavy metal intoxications involving the brain may be divided into two groups: One, in which the offending metal is clearly a poison, such as mercury or lead; and a second, in which the offending agent is normally an essential constituent of the body. The latter category would include manganese poisoning, copper poisoning (or Wilson's disease) and, if some recent data are valid, Huntington's chorea, in which iron seems to have been implicated. Our interest in the second category of diseases … more
Date: December 24, 1963
Creator: Cotzias, George. C. & Van Woert, Melvin H.
Partner: UNT Libraries Government Documents Department
open access

Recent Studies on the Experimental Program Requirements for a Super High Energy Accelerator

Description: Brookhaven has sponsored a summer program to study possible experimentation with super-high-energy accelerators of ~ 1000 BeV and to examine the feasibility of colliding beam experiments. A group of about fifty physicists took part in this study program. These investigations are a continuation and supplementary to our previous studies at Brookhaven about two years ago.
Date: December 24, 1963
Creator: Yuan, Luke C. L.
Partner: UNT Libraries Government Documents Department
open access

Neutron Activation Analysis: Clinical and Biological Studies of Manganese

Description: A strong motivation for metabolic investigations of essential metals lies with the simple fact that these elements are primordial metabolites and building blocks of living matter, a truism largely forgotten today. Among them, the metals of the first transition group display high physical and chemical flexibility: They can concomitantly coordinate natural or artificial ligands; they can regulate electron and proton transport; they can act as catalysts or as cofactors to catalysis.
Date: December 24, 1963
Creator: Cotzias, G. C.; Papavasiliou, P. S. & Miller, S. T.
Partner: UNT Libraries Government Documents Department
open access

A Model for Current Reversal Chronopotentiometry with Kinetic Complications

Description: A model has been developed for the analysis of current reversal chronopotentiograms in systems where the electrode process is followed by a homogeneous second order reaction. The model is analyzed using the IBM 7094 digital computer programed in FORTRAN language. Working curved, derived with the aid of dimensional analysis, can be used to evaluate rate constants from experimental data. The electroreducation of uranium (VI) to uranium (V) with subsequent second order disproportionation of uraniu… more
Date: December 24, 1963
Creator: Feldberg, S. W. & Auerbach, Clemens
Partner: UNT Libraries Government Documents Department
open access

Light-Droven Cytochrome Reactions in Anacystis and Euglena

Description: The basic similarity in cytochrome physiology between Anacystis nidulans ad Euglena gracilis, strains Z, is impressive in view of their gross dissimilarities in size, structure, and pigment content. We have investigated the cytochrome reactions by sensitive spectrophotometric methods in order to gain some insight into the patterns of energy transfer from the various light receptors to the reaction centers involved in the two photochemical reactions of green plant photosynthesis and also to eluc… more
Date: December 24, 1963
Creator: Olson, John M.
Partner: UNT Libraries Government Documents Department
open access

Effect of Long-Range Interactions on Order

Description: Harrison and Paskin (HP) have calculated the ordering energy of β-CuZn using recent theoretical techniques of treating electron screening and Mott's polar model of an alloy. Good agreement is obtained between the calculated total energy of the order-disorder transformation and specific heat measurements. A consequence of the HP calculation is that the ordering energy is long-range and oscillates in sign. Walker and Keating recently measured the neutron diffuse scattering of β-CuZn above the cri… more
Date: December 24, 1963
Creator: Paskin, Arthur
Partner: UNT Libraries Government Documents Department
open access

Past Analogue Multipliers with Field-Effect Transistors

Description: The solution time of analogue multipliers using field-effect transistors is investigated. This time is ultimately limited by the charging time of the field-effect transistor junction. In typical devices suitable for analogue multiplication the charging time is found to be about 10-20 nsec less than one percent. A four quadrant pulse amplitude multiplier circuit is described, whose solution time is equal to the field-effect transistor charging time.
Date: December 24, 1963
Creator: Radeka, V.
Partner: UNT Libraries Government Documents Department
open access

Calculation of Average Flux in Moderator of Water Lattices by Means of a Relaxation Method

Description: The following report concerns the application of a relaxation mesh method for the determination of the average flux within the moderator of a light water moderated, 1.027 per cent U-235, hexagonal lattice with a volume ratio (V_H2O + V_Al)/V_Uranium of 4:1. It was hoped that the calculation would enable one to determine any differences in flux which might result from the fact that the unit cell is a hexagon instead of a cylinder. Because we were primarily interested in the effect due to geometr… more
Date: March 24, 1953
Creator: Oleksa, S. & Mozer, B.
Partner: UNT Libraries Government Documents Department
open access

The Cosmotron Radio Frequency Accelerating System

Description: The proton beam in the Cosmotron is accelerated to an energy of 2.3 billion electron volts by a radio frequency voltage which is impressed across an insulated gap in the ferrite loaded accelerating cavity of the vacuum chamber. To maintain a constant orbit radius as the beam is accelerated, the frequency of the accelerating voltage must increase from the initial value of 370 kc/sec to 4200 kc/sec during the one second magnet pulse. Over the entire 11:1 frequency range, a minimum gap voltage of … more
Date: November 24, 1953
Creator: Rogers, Edwin, J. & Flotkin, M.
Partner: UNT Libraries Government Documents Department
open access

The Role of Internal Conversion in the Study of Isomeric Transitions

Description: A short review of the field of internal conversions. Isomeric transitions teach us many details of nuclear structure. In these studies electromagnetic theory is considered as a "tool". It is a quite quantitative tool in the case of "internal conversion" - a phenomenon which has been widely studied for many years. Internal conversion takes place in competition with γ-ray emission: a fraction of the nuclei in excited states decay by γ-ray emission, the remaining fraction by transferring the energ… more
Date: June 24, 1954
Creator: Goldhaber, M.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen