FINAL SPECIFICATIONS FOR GOVERNMENT-PURCHASED EQUIPMENT FOR ARGONNE LOW POWER REACTOR (ALPR)

The final specifications for equipment for the ALPR were prepared from original bid specifications, proposals submitted on equipment purchased, and purchase orders. Each specification includes data pertaining to the equipment purchased, revisions made during the shop fabrication, reference drawing lists vendor's name, and purchase order numbers. (A.C.

A GAMMA-RAY ATTENUATION METHOD FOR VOID FRACTION DETERMINATIONS IN EXPERIMENTAL BOILING HEAT TRANSFER TEST FACILITIES

Gamma rays emanating from a radioactive source are beamed through and are attenuated by steam --water mixtures contained in a simulated reactor flow channel. The emergent radiation is detected by a scintillation crystalphotomultiplier tube assembly. An expression is developed which yields the void fraction when the detector output with the channel empty, filled with water, and containing the mixture in question is known. The principal sources of errors inherent in the method are analyzed and their magnitudes computed for a specific test facility. With a uniform bubble distribution on this facility, the maximum possible error in void fraction is approximately plus or minus 0.03. The method is also applied to three idealized preferential phase distributions simulated in Lucite. However, the large discrepancy between calculated and measured void fractions illustrates the need for more refined experimental techniques where non-uniform distribution of voids are encountered. Such techniques are being developed. (auth

How to assess and report the performance of a stochastic algorithm on a benchmark problem: Mean or best result on a number of runs?

SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Item Selection in Multidimensional Computerized Adaptive Testing—Gaining Information from Different Angles

Kullback–Leibler information, Fisher information, mutual information, multidimensional computerized adaptive test, continuous entropy,

Behavioural coordination structural congruence and entrainment in a simulation of acoustically coupled agents.

Social coordination is studied in a simulated model of autonomous embodied agents that interact acoustically. Theoretical concepts concerning social behavior are presented from a systemic per spective and their usefulness is evaluated in interpreting the results obtained. Two agents moving in an unstructured arena must locate each other, and remain within a short distance of one anoth er for as long as possible using noisy continuous acoustic interaction. Evolved dynamical recurrent neural networks are used as the control architecture. Acoustic coupling poses nontrivial problems like discriminating 'self' from 'non-self' and structuring production of signals in time so as to minimize interference. Detailed observation of the most frequently evolved behavioral strategy shows that interacting agents perform rhythmic signals leading to the coordination of movement. During coordination, signals become entrained in an anti-phase mode that resembles turn-taking. Perturbation techniques show that signalling behavior not only performs an external function, but it is also integrated into the movement of the producing agent, thus showing the difficulty of separating behavior into social and non-social classes. Structural congruence between agents is shown by exploring internal dynamics as well as the response of single agents in the presence of signalling beacons that reproduce the signal patterns of the interacting agents. Lack of entrainment with the signals produced by the beacons shows the importance of transient periods of mutual dynamic perturbation wherein agents achieve congruence