7 Matching Results

Search Results

Results: 1 - 7
open access

Algorithmic chemistry

Description: In this paper complex adaptive systems are defined by a self- referential loop in which objects encode functions that act back on these objects. A model for this loop is presented. It uses a simple recursive formal language, derived from the lambda-calculus, to provide a semantics that maps character strings into functions that manipulate symbols on strings. The interaction between two functions, or algorithms, is defined naturally within the language through function composition, and results i… more
Date: December 13, 1990
Creator: Fontana, W.
Partner: UNT Libraries Government Documents Department
open access

Method of calculating test leakage rate for a spent fuel cask

Description: This report presents a method for calculating containment test leakage rates of radionuclides from an example spent fuel cask. Three releasable radioactive sources are considered: residual contamination in the cask cavity, crud on the fuel elements, and the radionuclides within the fuel rods. The ANSI N14.5 standard is used to calculate the test leakage rates from the maximum permissible releases determined from 10 CFR 71 containment requirements. 6 refs., 2 tabs.
Date: June 13, 1990
Creator: Fischer, L. E.
Partner: UNT Libraries Government Documents Department
open access

X-Ray Microcalorimeters With Germanium Resistance Thermometers

Description: We report on the current of our work on x-ray microcalorimeters for use as high resolution x-ray spectrometers. To maximize the x-ray collecting area and the signal to noise ratio, the total heat capacity of the device must be minimized. This is best achieved if the calorimeter is divided into two components, a thermal sensor and an x-ray absorber. The thermal sensor is a neutron transmutation doped (NTD) germanium resistor made as small as possible to minimize the heat capacity of the calorime… more
Date: August 13, 1990
Creator: Labov, S.; Silver, E.; Pfafman, T.; Wai, Y. (Lawrence Livermore National Lab., CA (USA)); Beeman, J.; Goulding, F. et al.
Partner: UNT Libraries Government Documents Department
open access

Uncertainties in the Effects of Burnup and Their Impact on Criticality Safety Licensing Criteria

Description: Current criteria for criticality safety for spent fuel shipping and storage casks are conservative because no credit is permitted for the effects of burnup of the fuel inside the cask. Cask designs that will transport and store large numbers of fuel assemblies (20 or more) must devote a substantial part of their payload to criticality control measures if they are to meet this criteria. The Department of Energy is developing the data necessary to support safety analyses that incorporate the effe… more
Date: July 13, 1990
Creator: Carlson, Roger W. & Fisher, Larry E.
Partner: UNT Libraries Government Documents Department
open access

Bragg Crystal Polarimeter for the Spectrum-X-Gamma Mission

Description: We are designing a Bragg crystal polarimeter for the focal plane of the SODART telescope on the Spectrum-X-Gamma mission. A mosaic graphite crystal will be oriented at 45{degree} to the optic axis of the telescope, thereby preferentially reflecting those x-rays which satisfy the Bragg condition and have electric vectors that are perpendicular to the plane defined by the incident and reflected photons. The reflected x-rays will be detected by an imaging proportional counter with the image provid… more
Date: August 13, 1990
Creator: Holley, J.; Silver, E.; Ziock, K.P. (Lawrence Livermore National Lab., CA (USA)); Novick, R.; Kaaret, P. (Columbia Univ., New York, NY (USA). Columbia Astrophysics Lab.); Weisskopf, M. et al.
Partner: UNT Libraries Government Documents Department
open access

Test results of a prototype dielectric microcalorimeter

Description: The initial development work on a dielectric microcalorimeter is presented. It focuses on the dielectric properties of the ferroelectric material KTa{sub 1-x}Nb{sub x}O{sub 3} (KTN). Measurements of the temperature dependent dielectric constant are given together with the first alpha particle detection results from a prototype composite microcalorimeter operating at 1.3 K. a non-thermal mechanism for detecting 6 MeV alpha particles in a monolithic KTN sample is also reported. 7 refs, 16 figs., … more
Date: August 13, 1990
Creator: Pfafman, T. E.; Silver, E.; Labov, S.; Beeman, J.; Goulding, F.; Hansen, W. et al.
Partner: UNT Libraries Government Documents Department
open access

Application of kinetic inductance thermometers to x-ray calorimetry

Description: A kinetic inductance thermometer is applied to x-ray calorimetry, and its operation over a wide range of frequencies and geometries is discussed. Three amplifier configurations are described, one using a superconducting quantum interference device (SQUID) amplifier, another incorporating an FET amplifier in an amplitude modulated system, and the third, using a tunnel diode frequency modulated oscillator circuit. The predicted performance of each configuration is presented. 13 refs., 6 figs., 1 … more
Date: August 13, 1990
Creator: Wai, Y. C.; Labov, S. E. & Silver, E. H.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen