An electron spectrum and profile monitor for the UK free electron laser

A versatile electron spectrum monitor has been developed for the UK free electron laser project. The monitor uses secondary emission from 96 tungsten foils and microprocessor-controlled sampling electronics to produce a high-resolution electron energy spectrum. A 30-channel prototype is currently operating as a beam profile monitor and has been extensively used in emittance measurements at the Kelvin Laboratory linac.     

The physics of mechanical alloying: A first report

In this paper, we present a first attempt to define the basic geometry, mechanics, and physics of the process of mechanical alloying. The geometry of the collision events which lead to particle fragmentation and coalescence is modeled on the basis of Hertzian contacts between the grinding media which entrap a certain amount of material volume between the impacting surfaces. This geometry essentially defines the volume of material affected per collision, and from this information and characteristics of the specific mill and the material being processed, impact times, powder strain rates and strains, powder temperature increase, powder cooling times, and milling times can be approximated.     

Formal computations of non deterministic recursive program schemes

We extend to non deterministic recursive program schemes the methods and results which permit definition of the semantics of such schemes in the deterministic case. Under natural hypothesis the set of finite and infinite trees generated by a scheme is proved to be the greatest fixed point of the functional mapping usually attached to this scheme.     

In-pile creep study on mixed oxide (U,Pu)O2

The in-pile creep of a mixed oxide UO₂-PuO₂ under compression was studied up to fission rate of $\text{6 × 10}{}^{13}\text{f cm}{}^{\mathrm{?3}}\text{s}{}^{\mathrm{?1}}$, for stresses up to 26.5 MN m^?2, at temperatures ranging from 700 to 900°C. The results obtained agree with those of other authors. The creep rate is proportional to the applied stress and to the fission yield. However, it is athermal within the temperature range explored and is not affected by the burn-up, which has so far reached 30000 MWd t^?1 (3.6% FIMA). When the sample is under compression the fuel swells under the action of the fission products formed in the oxide during its irradiation. The swelling rate is about that commonly accepted for a clad fuel element. Finally it seems that the oxide swells more when free from stress than when subjected to a stress field, but this point has to be confirmed.     

Algorithmes relatifs a la decomposition des polynomes

Améliorations et remarques sur un algorithme dû à H. Zassenhaus, qui fournit la factorisation d'un polynôme à coeffecients entiers. Puis un algorithme très rapide et très simple qui donne des informations utiles sur la décomposition d'un polynôme modulo p. Applications: tests modulo p d'irréductibilité, de décomposition en facteurs linéaires d'un polynôme, de décomposition d'un idéal en O (log p) opérations.     

One determinant of the capacity to free-associate in psychotherapy.

The hypothesis tested was that "clients whose behavior when asked to free associate is highly variable, flexible, or productive exhibit significantly greater variability when judging the extent of autokinetic movement on successive trials than Ss whose behavior at the outset of psychotherapy is highly inflexible, stereotyped, or rigid." 7 neurotic college student analysands in the extremely flexible group were matched with 10 Ss of the extremely rigid group for relevant personal variables. Sherif's autokinetic apparatus was used, and each S's judgmental variability was determined. The highly significant difference between autokinetic variability scores of the 2 groups lends strong support to the hypothesis. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The thermodynamic properties of liquids,including solutions. XIV. Solutions of normal alkanes: Models for oligomer solutions

From published H^E data for 10 n-alkane solutions in benzene at 25°C, the three parameters of the author's solution theory have been calculated. The values obtained agree quite well with εΔ = 3068 J/mole, K = 1, and r_σ = 0.2 + 0.2 n_c = 0.1 n_H. The problems involved in the extension of these results to higher oligomers of polymethylene and to other solutions of chain molecules are briefly discussed.