1,147 research outputs found
Heuristic environment as condition of art criticism competence development for future teachers
Essential factor of professionally significant competences development of future art direction teachers is the educational environment as which it is necessary to understand the integrity of pedagogical conditions, interactions, processes, components of pedagogical process which is specially organized for achievement of the educational purposes. Results of a theoretical research which purpose was studying characteristics of the heuristic environment as conditions of development of competences of future art direction teachers are presented in article. The main intrinsic characteristic of the heuristic educational environment is the following: recognition of value of creative activity of subjects of educational process; implementation of stimulation, support and encouragement of creative activity of students; granting opportunities for inclusion in creative activity. The empirical research was directed to studying influence of specially organized heuristic educational environment on development of art criticism competence of future art direction teachers. Testing, observation, method of expert evaluations of results of creative activity were used by us for realization of a pedagogical experiment. The conducted research allowed to reveal that specially organized heuristic environment promotes high-quality development of art criticism competence which is shown in the following: future art direction teachers acquire culturological and art criticism contents at the levels above an average and high; barriers to transition to creative activity in the field of art criticism are broken; personalization of development of art criticism competence is carried out. Keywords: educational environment, heuristics, heuristic environment, art criticism competenc
Surgical management of ovarian dermoid cysts in children and adolescents
Department of Obstetrics and
Gynecology, Medical University “N. Testemitsanu”, Kishinev, MoldovaIntroduction: The ovarian dermoid cysts are one of the most common neoplastic ovarian
injuries found both in children and teenagers. For the girls with small ovarian diseases organ
preserving operation it's extremely important for a proper functioning of puberty and future fertility.
Purpose and Objectives: The aim of study was to present the reasons for making these surgeries
in all the cases of ovarian dermoid cysts in order to ensure fertility and menstruation every month.
Methods and materials: A prospective and retrospective analysis of all the ovarian cysts
both in children and teenagers aged between 8 and 18, from the year 2000 through 2012 admitted in
the Institute of Mother and Child Care, the department of operative gynecology was performed.
Results: The ovarian dermoid cysts were localized mostly in the right side having a
percentage of 64.7 vs. 35.3 for the left side. Cysts outermost dimension were 79.6±7.2 mm (95%
CI:64.30-94.82) and minimum were - 65.1±6.5 mm (95% C l:51.21 -79.04), from 56 to 156 mm.
Laparatomy was the surgery that was mostly used - 14/17 (82.4%), and laparoscopy was done only
in 3/17 (17.6% ) cases. All of the organ preserving operations were statistically more common
(p<0.001) over ovariectomy and were 14/17 (82.4%) vs. 3/17 (17.6%).
Conclusions: It is vital to have a proper surgical approach for all the children and teenagers
with ovarian cysts for maintaining a good sexual growth and fertility in the near future. These
surgeries are the best method for this group of patient
Quantum memory for light via stimulated off-resonant Raman process: beyond the three-level Lambda-scheme approximation
We consider a quantum memory scheme based on the conversion of a signal pulse
into a long-lived spin coherence via stimulated off-resonant Raman process. For
a storing medium consisting of alkali atoms, we have calculated the
Autler-Townes resonance structure created by a strong control field. By taking
into account the upper hyperfine states of the D1 optical transition, we show
important deviations from the predictions of the usual three-level
Lambda-scheme approximation and we demonstrate an enhancement of the process
for particular detunings of the control. We estimate the memory efficiency one
can obtain using this configuration.Comment: 8 pages, 6 figure
High frequency polarization switching of a thin ferroelectric film
We consider both experimentally and analytically the transient oscillatory
process that arises when a rapid change in voltage is applied to a
ferroelectric thin film deposited on an substrate.
High frequency () polarization oscillations are observed
in the ferroelectric sample. These can be understood using a simple
field-polarization model. In particular we obtain analytic expressions for the
oscillation frequency and the decay time of the polarization fluctuation in
terms of the material parameters. These estimations agree well with the
experimental results
Optical second harmonic generation probe of two-dimensional ferroelectricity
Optical second harmonic generation (SHG) is used as a noninvasive probe of
two-dimensional (2D) ferroelectricity in Langmuir-Blodgett (LB) films of
copolymer vinylidene fluoride with trifluorethylene. The surface 2D
ferroelectric-paraelectric phase transition in the topmost layer of LB films
and a thickness independent (almost 2D) transition in the bulk of these films
are observed in temperature studies of SHG.Comment: 9 pages, 2 figures, Optics Letters, in prin
Electromagnetically induced transparency in inhomogeneously broadened Lambda-transition with multiple excited levels
Electromagnetically induced transparency (EIT) has mainly been modelled for
three-level systems. In particular, a considerable interest has been dedicated
to the Lambda-configuration, with two ground states and one excited state.
However, in the alkali-metal atoms, which are commonly used, hyperfine
interaction in the excited state introduces several levels which simultaneously
participate in the scattering process. When the Doppler broadening is
comparable with the hyperfine splitting in the upper state, the three-level
Lambda model does not reproduce the experimental results. Here we theoretically
investigate the EIT in a hot vapor of alkali-metal atoms and demonstrate that
it can be strongly reduced due to the presence of multiple excited levels.
Given this model, we also show that a well-designed optical pumping enables to
significantly recover the transparency
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