65,967 research outputs found
Continuity and variability in the parental involvement and advocacy beliefs of Latino families of young children
Parental involvement is an important component of childrenās school success. Although the literature on parental involvement among Latino families is growing and moving from deficit-based perspectives, very few studies have
examined the parental involvement beliefs and practices of Latino families who vary across demographic and sociocultural lines within the same school community. This qualitative study explored Latino parentsā beliefs about childrenās
education, their involvement and advocacy beliefs and practices, and their perceptions of feeling welcome at their childrenās school. In-depth interviews were conducted with 12 parents of preschool and kindergarten children who attended a bilingual school. Qualitative descriptive analyses revealed that the majority of parents espoused the cultural value of educaciĆ³n, engaged in learning activities at home, and viewed themselves as living models of behavior for children, regardless of their education or immigrant status. Only first generation immigrant parents made explicit reference to childrenās futures. All parents
attributed supportive relationships with school personnel and a bilingual climate as the most important sources of feeling welcome at school. However, parents with more education valued what they perceived as an āopen door policyā and were more vocal in critiquing policies. Findings have implications for the development of multicultural competence among teachers and for ways diverse Latino families might develop a shared voice within the school sector.Published versio
A study of Wigner functions for discrete-time quantum walks
We perform a systematic study of the discrete time Quantum Walk on one
dimension using Wigner functions, which are generalized to include the
chirality (or coin) degree of freedom. In particular, we analyze the evolution
of the negative volume in phase space, as a function of time, for different
initial states. This negativity can be used to quantify the degree of departure
of the system from a classical state. We also relate this quantity to the
entanglement between the coin and walker subspaces.Comment: 16 pages, 8 figure
Revising the Solution of the Neutrino Oscillation Parameter Degeneracies at Neutrino Factories
In the context of neutrino factories, we review the solution of the
degeneracies in the neutrino oscillation parameters. In particular, we have set
limits to in order to accomplish the unambiguous
determination of and . We have performed two different
analysis. In the first, at a baseline of 3000 km, we simulate a measurement of
the channels , and
, combined with their respective conjugate ones,
with a muon energy of 50 GeV and a running time of five years. In the second,
we merge the simulated data obtained at L=3000 km with the measurement of
channel at 7250 km, the so called 'magic baseline'. In both
cases, we have studied the impact of varying the detector
efficiency-mass product, , at 3000 km,
keeping unchanged the detector mass and its efficiency. At L=3000 km,
we found the existance of degenerate zones, that corresponds to values of
, which are equal or almost equal to the true ones. These zones
are extremely difficult to discard, even when we increase the number of events.
However, in the second scenario, this difficulty is overcomed, demostrating the
relevance of the 'magic baseline'. From this scenario, the best limits of
, reached at , for ,
0.975 and 0.99 are: 0.008, 0.015 and 0.045, respectively, obtained at
, and considering ,
which is five times the initial efficiency-mass combination.Comment: 40 pages, 18 figures; added references, corrected typos, updated Eq
(15c
Magnetized strange quark matter and magnetized strange quark stars
Strange quark matter could be found in the core of neutron stars or forming
strange quark stars. As is well known, these astrophysical objects are endowed
with strong magnetic fields which affect the microscopic properties of matter
and modify the macroscopic properties of the system. In this paper we study the
role of a strong magnetic field in the thermodynamical properties of a
magnetized degenerate strange quark gas, taking into account beta-equilibrium
and charge neutrality. Quarks and electrons interact with the magnetic field
via their electric charges and anomalous magnetic moments. In contrast to the
magnetic field value of 10^19 G, obtained when anomalous magnetic moments are
not taken into account, we find the upper bound B < 8.6 x 10^17 G, for the
stability of the system. A phase transition could be hidden for fields greater
than this value.Comment: 9 pages, 9 figure
CP violating effects in the decay Z -> mu^+mu^-gamma induced by ZZgamma and Zgammagamma couplings
We analyze possible CP-violating effects induced in the decay with hard
photon radiation by and anomalous vertices. We
estimate the sensibility of future linear collider experiments on these
couplings coming from CP-odd asymmetries associated to angular correlations of
the three particle final state in . We find
that a linear collider with an integrated luminosity of 500 and
TeV can place the bound at the 90%
confidence level for these couplings.Comment: Added references, 2 graphics 5 pages, LaTeX; typos added, 4 graphics
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