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2.
Phys Rev Lett ; 94(2): 025505, 2005 Jan 21.
Article in English | MEDLINE | ID: mdl-15698192

ABSTRACT

The defect accumulation mechanism of amorphization has been studied for the La2Zr2O7 pyrochlore by means of classical molecular dynamic simulations. Present calculations show that the accumulation of cation Frenkel pairs is the main driving parameter for the amorphization process, while the oxygen atoms simply rearrange around cations. Under Frenkel pair accumulation, the structure follows the pyrochlore-fluorite-amorphous sequence. Present results consequently provide atomic-level interpretation to previous experimental irradiation observations of the two-step phase transition.

3.
Braz. j. med. biol. res ; 36(9): 1135-1141, Sept. 2003. ilus, tab
Article in English | LILACS | ID: lil-342863

ABSTRACT

Brazil's scientific community is under pressure. Each year there is an increase in its contribution to international science and in the number of students who are trained to do research and teach at an advanced level. Most of these activities are carried out in state and federal universities, but with government funding that has decreased by more than 70 percent since 1996. Interviews with graduate students, post-doctoral fellows and professors in one university department with a strong research tradition illustrate the level of stress engendered by the conflict between increasing competition and diminishing resources, and serve to underscore the negative effects on creativity and on the tendency to choose science as a career


Subject(s)
Humans , Burnout, Professional , Career Choice , Competitive Behavior , Research , Research Personnel , Brazil , Goals , Interview, Psychological , Public Sector , Research Personnel
4.
Braz J Med Biol Res ; 36(9): 1135-41, 2003 Sep.
Article in English | MEDLINE | ID: mdl-12937778

ABSTRACT

Brazil's scientific community is under pressure. Each year there is an increase in its contribution to international science and in the number of students who are trained to do research and teach at an advanced level. Most of these activities are carried out in state and federal universities, but with government funding that has decreased by more than 70% since 1996. Interviews with graduate students, post-doctoral fellows and professors in one university department with a strong research tradition illustrate the level of stress engendered by the conflict between increasing competition and diminishing resources, and serve to underscore the negative effects on creativity and on the tendency to choose science as a career.


Subject(s)
Biomedical Research , Burnout, Professional/psychology , Career Choice , Competitive Behavior/physiology , Research Personnel/psychology , Adult , Brazil , Goals , Humans , Interview, Psychological , Public Sector , Research Personnel/trends
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