729 research outputs found
The Effects of Tablets on Learning: Does Studying from a Tablet Computer Affect Student Learning Differently Across Educational Levels
In recent years, students and educators alike have utilized new technologies such as tablet computers as a means of enhancing the learning process. While prior research suggests that these implementations within the classroom provide a new and beneficial method of relaying and learning information, scientists have begun to explore the possible side effects that these technologies have on the learning process. Although much of the current literature suggests that learning from an electronic screen does not affect efficacy compared to learning from printed text (Bayliss et al., 2012; Dundar & Akcayir, 2012), researchers continue to explore the possible consequences that using said technologies may have in academia. The current study aims to address how tablet computers affect the process of learning differently across levels of education. It is proposed that older generations, such as college students, who did not grow up with tablets in the classroom may suffer from the effects of proactive interference when compared to younger students who have been exposed to technologies much more profoundly in their education (e.g. elementary students). If this is so, the current study also proposes a possible intervention that would help students at any educational level overcome this interference in order to integrate tablets into their studies effectively
Energetics, Particle Capture and Growth Dynamics of Benthic Suspension Feeders
Marine benthic communities are dominated by suspension feeders, including
those actively pumping water, passively encountering particles, or some combination
of the two. The mechanisms by which particles are encountered and
retained are now well known for a range of water flow conditions and organism
morphologies. Recent research has attempted to quantify the energetic components
of suspension feeding, including intake of particles, pumping rates, and
metabolic costs of these activities. Energetic models depend strongly on environmental
conditions, including temperature, flow speed, and food availability, for
example. The effects of these variables have been combined for realistic scenarios
using dynamic energy budget (DEB) models, and related models to examine
components of fitness (growth, reproduction, population increase), for both
existing conditions and for conditions expected for future environments. Detailed
examples are provided from recent research on bivalve mollusks, cnidarians
including sea anemones and corals, and barnacles. These examples cover several
major phyla that are often important components of intertidal and subtidal benthic
communities. All common phyla of benthic suspension feeders are discussed,
though less extensively, especially given the paucity of energetics studies for
some of these phyla
Spin-stripe density varies linearly with hole content in single-layer Bi2201 cuprate
We have performed inelastic neutron scattering measurements on the
single-layer cuprate Bi2+xSr2-xCuO6+y (Bi2201) with x=0.2, 0.3, 0.4 and 0.5, a
doping range that spans the spin-glass (SG) to superconducting (SC) phase
boundary. The doping evolution of low energy spin fluctuations was found to be
characterized by a change of incommensurate modulation wave vector from the
tetragonal [110] to [100]/[010] directions, while maintaining a linear relation
between the incommensurability and the hole concentration, delta p. In the SC
regime, the spectral weight is strongly suppressed below 4 meV. Similarities
and differences in the spin correlations between Bi2201 and the prototypical
single-layer system La2-xSrxCuO4 are discussed.Comment: 5 page,4 figure
Fluctuation properties of strength function associated with the giant quadrupole resonance in 208Pb
We performed fluctuation analysis by means of the local scaling dimension for
the strength function of the isoscalar (IS) giant quadrupole resonance (GQR) in
208Pb where the strength function is obtained by the shell model calculation
including 1p1h and 2p2h configurations. It is found that at almost all energy
scales, fluctuation of the strength function obeys the Gaussian orthogonal
ensemble (GOE) random matrix theory limit. This is contrasted with the results
for the GQR in 40Ca, where at the intermediate energy scale about 1.7 MeV a
deviation from the GOE limit was detected. It is found that the physical origin
for this different behavior of the local scaling dimension is ascribed to the
difference in the properties of the damping process.Comment: 10 pages, 14 figures, submitted to Physical Review
Ultrasonic attenuation in magnetic fields for superconducting states with line nodes in Sr2RuO4
We calculate the ultrasonic attenuation in magnetic fields for
superconducting states with line nodes vertical or horizontal relative to the
RuO_2 planes. This theory, which is valid for fields near Hc2 and not too low
temperatures, takes into account the effects of supercurrent flow and Andreev
scattering by the Abrikosov vortex lattice. For rotating in-plane field
H(theta) the attenuation alpha(theta)exhibits variations of fourfold symmetry
in the rotation angle theta. In the case of vertical nodes, the transverse T100
sound mode yields the weakest(linear)H and T dependence of alpha, while the
longitudinal L100 mode yields a stronger (quadratic) H and T dependence. This
is in strong contrast to the case of horizontal line nodes where alpha is the
same for the T100 and L100 modes (apart from a shift of pi/4 in field
direction) and is roughly a quadratic function of H and T. Thus we conclude
that measurements of alpha in in-plane magnetic fields for different in-plane
sound modes may be an important tool for probing the nodal structure of the gap
in Sr_2RuO_4.Comment: 5 pages, 6 figures, replaced in non-preprint form, to appear in Phys.
Rev.
Abnormal direction of internal auditory canal and vestibulocochlear nerve
Several internal auditory canal (IAC) anomalies have been reported.To our knowledge, only one case with anabnormal direction of the IAC has been reported in an infant with Pierre Robin syndrome. In this paper, wepresent the first report of two non-syndromic cases with abnormal IAC direction.</p
Single-crystal growth and dependences on the hole concentration and magnetic field of the magnetic ground state in the edge-sharing CuO chain system CaYCuO
We have succeeded in growing large-size single-crystals of
CaYCuO with and measured the
magnetic susceptibility, specific heat and magnetization curve, in order to
study the magnetic ground state in the edge-sharing CuO chain as a function
of hole concentration and magnetic field. In , it has been
found that an antiferromagnetically ordered phase with the magnetic easy axis
along the b-axis is stabilized and that a spin-flop transition occurs by the
application of magnetic fields parallel to the b-axis. The antiferromagnetic
transition temperature decreases with increasing and disappears around 1.4. Alternatively, a spin-glass phase appears around . At where the hole concentration is 1/3 per Cu, it appears that a
spin-gap state is formed owing to the formation of spin-singlet pairs. No sign
of the coexistence of an antiferromagnetically ordered state and a spin-gap one
suggested in CaCuO has been found in
CaYCuO.Comment: 13 pages, 12 figures, 1 tabl
Low temperature electronic properties of Sr_2RuO_4 III: Magnetic fields
Based on the microscopic model introduced previously the observed specific
heat and ac-susceptibility data in the superconducting phase in Sr_2RuO_4 with
applied magnetic fields are described consistently within a phenomenological
approach. Discussed in detail are the temperature dependence of the upper
critical fields H_{c2} and H_2, the dependence of the upper critical fields on
the field direction, the linear specific heat below the superconducting phase
transition as a function of field or temperature, the anisotropy of the two
spatial components of the order parameter, and the fluctuation field H_p.Comment: 8 pages REVTEX, 4 figure
Mechanism of spin-triplet superconductivity in Sr2RuO4
The unique Fermi surfaces and their nesting properties of Sr2RuO4 are
considered. The existence of unconventional superconductivity is shown
microscopically, for the first time, from the magnetic interactions (due to
nesting) and the phonon-mediated interactions. The odd-parity superconductivity
is favored in the and sheets of the Fermi surface, and the
various superconductivities are possible in the sheet. There are a
number of possible odd-parity gaps, which include the gaps with nodes, the
breaking of time-reversal symmetry and .Comment: 4 pages, 3 figure
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