67 research outputs found
The Differentiation and Promotion of Studentsâ Rights in Portugal
This investigation includes a differential study (Study 1)
and a quasi-experimental research (Study 2). In Study 1, the objective
was to establish to what extent studentsâ rights existed and analyse
the differentiation between studentsâ rights with Portuguese and
immigrant mothers, throughout school years. The sample consisted of
537 students with Portuguese and immigrant mothers, distributed by
different school years (7th, 9th and 11th grades). The Childrenâs Rights
Scale (Hart et al., 1996; Veiga, 2001) was used. In Study 2, the purpose
was to analyse the effects on studentsâ rights of the use by teachers of a
communicational intervention program, supervised by school psychologists.
The sample involved 7th and 9th grade students, in a total of
four classes, two forming the experimental groups (n = 36) and two the
control groups (n = 43); as in Study 1, the Childrenâs Rights Scale was used. The results indicated the effectiveness of the communicational intervention program on studentsâ rights and are consistent with previous studies. An implication is that psychologists and teachers, working together and taking a human rights perspective, may develop an important role in projects to promote the studentsâ rights
Active control of qubit-qubit entanglement evolution
In this work, we propose a scheme to design the time evolution of the entropy
of entanglement between two qubits. It is shown an explicit accurate solution
for the inverse problem of determining the time dependence of the coupling
constant from a user-defined dynamical entanglement function. Such an active
control of entanglement can be implemented in many different physical
implementations of coupled qubits, and we briefly comment on the use of
interacting flux qubits.Comment: Author added, Expanded version, 10 figure
Entanglement in Weisskopf-Wigner theory of atomic decay in free space
In this paper, we use the Weisskopf-Wigner theory to study the entanglement
in the state of the free-space radiation field produced from vacuum due to
atomic decay. We show how bipartite entanglement is shared between different
partitions of the radiation modes. We investigate the role played by the size
of the partitions and their detuning with the decaying atom. The dynamics of
the atom-field entanglement during the atomic decay is also briefly discussed.
From this dynamics, we assert that such entanglement is the physical quantity
that fix the statistical atomic decay time.Comment: 7 pages, 4 figures, changed from purity to entropy of entanglement
calculations in the replaced versio
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