11 research outputs found
A mathematical model to describe the alpha dose rate from a UO2 surface
A model to determine the dose rate of a planar alpha-emitting surface, has
been developed. The approach presented is a computationally efficient
mathematical model using stopping range data from the Stopping Ranges of Ions
in Matter (SRIM) software. The alpha dose rates as a function of distance from
irradiated UO2 spent fuel surfaces were produced for bench-marking with
previous modelling attempts. This method is able to replicate a Monte Carlo
(MCNPX) study of an irradiated UO2 fuel surface within 0.6 % of the resulting
total dose rate and displays a similar dose profile
Synchrotron x-ray scattering of magnetic and electronic structure of UN and U2N3 epitaxial films
We examine the magnetic ordering of UN and of a closely related nitride,
U2N3, by preparing thin epitaxial films and using synchrotron x-ray techniques.
The magnetic configuration and subsequent coupling to the lattice are key
features of the electronic structure. The well-known antiferromagnetic (AF)
ordering of UN is confirmed, but the expected accompanying distortion at Tn is
not observed. Instead, we propose that the strong magneto-elastic interaction
at low temperature involves changes in the strain of the material. These
strains vary as a function of the sample form. As a consequence, the accepted
AF configuration of UN may be incorrect. In the case of cubic a-U2N3, no single
crystals have been previously prepared, and we have determined the AF ordering
wave-vector. The AF Tn is close to that previously reported. In addition,
resonant diffraction methods have identified an aspherical quadrupolar charge
contribution in U2N3 involving the 5f electrons; the first time this has been
observed in an actinide compound
Preocupações de carreira e adaptabilidade : estudo exploratório com uma amostra de candidatos a sargentos e oficiais do Exército Português
Tese de mestrado, Psicologia (Psicologia dos Recursos Humanos, do Trabalho e das Organizações), Universidade de Lisboa, Faculdade de Psicologia, 2010O presente trabalho consiste num estudo exploratório sobre as preocupações de
carreira e as dimensões da adaptabilidade, baseando-se na Perspectiva de
Desenvolvimento da Carreira de Donald Super e na Perspectiva Construtivista de
Mark Savickas. Pretende-se, ainda, contribuir para a investigação acerca do Inventário
sobre Adaptabilidade, que se encontra ainda em estudo no âmbito de um Projecto
Internacional.
Foram aplicados o Inventário das Preocupações de Carreira e o Inventário sobre
Adaptabilidade a uma amostra de 75 adultos candidatos a Sargentos e Oficiais do
Exército Português. Os resultados obtidos tendem a confirmar as hipóteses de
investigação formuladas, apontando para a relação entre a variável idade e as tarefas
de desenvolvimento das fases da carreira Exploração e Estabelecimento, para a
predominância das dimensões Confiança e Cooperação, e para a relação entre
preocupações de carreira e dimensões da adaptabilidade. Apresentam-se as
conclusões do presente estudo, algumas limitações deste e futuras linhas de
investigação. Tecem-se também algumas considerações sobre as implicações do
estudo para as práticas de gestão de carreira.This work is an exploratory study about the career concerns and the dimensions of
adaptability, based on the Perspective of the Career Development of Donald Super
and the Constructivist Perspective of Mark Savickas. It is also intended to contribute
to the research on the Career Adapt-Abilities Inventory, which is still under
investigation as part of an International Project.
The Career Concerns Inventory and the Career Adapt-Abilities Inventory were
applied to a sample of 75 adult candidates to Sergeants and Officers of the Portuguese
Army. The results seem to confirm the research hypotheses, pointing to the relation
between the variable age and the developmental tasks of the Exploration and
Establishment career phases, to the predominance of the dimensions Cooperation, and
Confidence and also to the relation between career concerns and adaptability
dimensions. The findings of this study, some of its limitations and future research
paths are presented. Some reflections are also discussed in what concerns the study's
implications for the career management practices