Modeling of the mechanical alloying process

Two programs have been developed to compute the dimensional and property changes that occur with repetitive impacts during the mechanical alloying process. The more sophisticated of the programs also maintains a running count of the fractions of particles present and from this calculates a population distribution. The programs predict powder particle size and shape changes in accord with the accepted stages of powder development during mechanical alloying of ductile species. They also predict hardness and lamellar thickness changes with processing, again with reasonable agreement with experimental results. The benefits of these predictions are twofold. First, they offer support of the model (and thereby give insight into the possible “actual” happenings of mechanical alloying) and hence allow refinement and calibration of the myriad aspects of the model. Second, they provide a vehicle for establishing control over the dimensions and properties of the output powders used for consolidation, thereby facilitating optimization of the consolidation process.     

Naissance de l'ordre scolaire aux XVIIe et XVIIIe siècles et évolution des représentations psychosociales de l'enfance.

Describes the development of educational concepts and methods during the 17th and 18th centuries, with an emphasis on the origin of the differentiation between "normal" and "abnormal" school children. Psychosocial conceptualizations of childhood and educational concepts and methods that have led to the gradual integration of abnormal children into the regular school system are emphasized. (English abstract) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Constancy of psychotic syndromes in men and women.

Interview behavior ratings were obtained on the Inpatient Multidimensional Psychiatric Scale for 375 male and 448 female psychotics from 16 state and university hospitals. An hypothesis-testing factor analysis confirmed 11 of the 12 factors (syndromes) hypothesized. The congruency coefficients indicated essential constancy between men and women across the 11 syndromes established. 4 similar 2nd order factors accounted for the correlations among the factor scores in both groups. Comparisons of the 2 sexes as to score level revealed that the males were more retarded, while the females were more excited. Thus, men and women are quite similar as to the kinds of psychotic behaviors they exhibit. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Etude tachistoscopique de la spécialisation hémisphérique chez l'agénésique du corps calleux.

A brother (aged 9 yrs) and his sister (aged 18 yrs) with total agenesis (nondevelopment) of the corpus callosum and matched IQs (77–78 points) were administered a hemispheric-specialization task, using tachistoscopic presentation of visual stimuli, to investigate hemispheric specialization in callosal agenesis. A group of normal controls also completed the task for comparison. No differences were found between siblings and controls in terms of response accuracy. However, the 2 siblings showed abnormally long RTs and engaged more frequently in ocular scanning than controls. When a motor response was required, the siblings displayed a left visual-field superiority, regardless of the stimulus nature. Results are discussed in terms of abnormal organization of hemispheric function in callosal agenesis. (23 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Fifty years of polymer research

The writer summarises his researches in the field of polymer science. He began with studies of the structures of space-network and sheet polymers in crystals. Currently he is working on the structures of macro-ions in silicate and borate crystals and glasses and on the development of a new theory of structures and thermodynamic properties of (polymer and other) solutions.