Nuclear rocket shielding methods, modification, updating, and input data preparation. Volume 5 - Two-dimensional, discrete ordinates transport technique Final progress report

Two dimensional, discrete ordinates transport technique for use with nuclear rocket shielding methods, modification, updating, and data input preparation - Vol.

Nuclear rocket shielding methods, modification, updating, and input data preparation. Volume 1 - Synopsis of methods and results of analysis Final progress report

Analysis of data systems and computer programs for nuclear rocket shielding methods, modification, updating, and data input preparation - Vol.

JOFIT--A LEAST SQUARES BESSEL Jsub0sub 0 FITTING PROGRAM FOR THE IBM-704 COMPUTER

The JOFIT code fits, by a least squares technique, the curve y = A J/sub o/STAB(x-C)! from 4 to 500 points of observed data, computing the parameters A, B, C and the standard deviation of the final values of A, B, C, i.e., S/sub A/, S/ sub B/, S/sub C/. It is also possible to investigate the error in a region about the final values of A, B, C by computing the sums of the squares of the residuals at a series of points in this neighborhood. Typical computing and editing time for a 50 point problem is 2 minutes. Any size IBM-704 computer is adequate, and drums and tapes are not used. (auth

A multimegawatt space power source radiator design

The multimegawatt space power sources (MMSPS) proposed for deployment in the late 1990s to meet mission burst power requirements, require an increase by four orders of magnitude in the power rating of equipment currently used in space. Prenger and Sullivan (1982) describe various radiator concepts proposed for such applications. They range from the innovative liquid droplet radiator (Mattick and Hertzberg 1981) to the more conventional heat pipe concept (Girrens 1982). The present paper deals with the design of the radiator for one such system, characterized by both high temperature and high pressure. It provides an estimate of the size, mass, and problems of orbiting such a radiator, based on the assumption that the next generation of heavy launch vehicle with 120-tonne carrying capacity, and 4000-m/sup 3/ cargo volume, will be available for putting hardware into orbit

DARED-1--AN IBM-704 PROGRAM FOR REDUCING DATA FROM FOIL IRRADIATION AND FITTING BY LEAST SQUARES TO BESSEL Jsub0sub 0 OR COSINE FUNCTION

A description is given of a code for the IBM-704 computer which reduces and fits by least squares the measurements of radioactivity of a sequence of foils. Corrections for background, counter deadtime, foil weight, and radioactive decay are applied, and readings outside a specified range are rejected. Errors due to statistical fluctuations are computed and off-center ordinates are calculated. Reduced data are then fitted by least squares to the best value of the arguments of Bessel J/sub o/ or cosine functions. Up to 100 foils in a sequence can be handled, and decay times up to 999 min can be accommodated. An IBM-704 computer having 8192 words of core storage is required. No drums or tapes are needed. Running time for a typical 50 point problem involving data reduction alone is 2 min. With least squares fitting, the same problem would require 4 min. (auth

Physics of tritium breeding as a geometric programming problem

Tritium breeding in a fusion-fission tokamak reactor is optimized by the technique of geometric programming. The neutronic processes are represented as an objective function found by fitting a generalized quadratic function of the zone widths to the breeding ratio found from planned computational experiments. The results of this technique are examined, and the predicted performance compared to neutronic calculations with the optimized values of the design variables