175 research outputs found
ΤHE IMPACT OF COGNITIVE DIMENSION OF TAM-PERCEIVED USEFULNESS AND PERCEIVED EASE OF USE IN TEACHERS’ ATTITUDES TOWARDS ICT’S INTEGRATION IN TEACHING ANCIENT GREEK LANGUAGE IN LOWER SECONDARY SCHOOL: THE CASE OF GREECE
This study aims to delve deeper into Greek teachers’ attitudes towards the use of ICT in ancient Greek teaching, in Greek public lower secondary schools, representing an attempt to identify the Cognitive Dimension of Greek teachers’ of ancient Greek language (philologists) attitudes. More specifically, the main goal is to examine Perceived Ease of Use and Perceived Usefulness concerning teachers’ of ancient Greek degree of familiarity with ICTs and the degree of effectiveness in ICT’s integration in teaching and learning practice. As for Perceived Ease of Use this research study investigates, in respect of teachers’ attitudes:a) ICT’s degree of personal and educational use,b) Self-perception degree towards ICT’s use, andc) Degree of ability in ICT’s teaching integration. As for Perceived Usefulness this study investigates:a) ICT’s usefulness degree in achieving learning objectives,b) Usefulness degree in teaching application of ICT, andc) ICT’s effectiveness degree as for teachers’ role. Broadly speaking, the research findings reveal that teachers of ancient Greek, use ICTs to do their lesson preparation and planning, but they are not used to integrating technology in teaching practices. Yet, Greek teachers of ancient Greek language consider -as important barrier/factor to use ICT in teaching and learning process- their lack of effective training in ICT’s teaching use. As a result, they show low self-perception degree -as for ICT’s use- and become more and more reluctant to adopt new technologies in teaching and learning procedure. Moreover, the findings stress that Greek philologists firmly believe that ICT can be used as an innovative tool of teaching and learning procedure, motivating teachers and increasing their interest in teaching approach. However, New Educational Technology is not applied in teaching practice and teachers of ancient Greek language -denied to ‘escape’ from traditional ways of teaching- prefer conventional/traditional teaching practices in ICT’s use to modern/contemporary teaching methods, achieving mainly cognitive goals. To sum up: a) gender, b) years of experience in teaching, c) specific knowledge in teaching ancient Greek language with ICT, and d) appropriate in-service training on ICTs have a significant impact on teachers’ of ancient Greek attitudes, regarding whether or not ICT’ s use enhance:a) traditional teaching style,b) linguistic literacy,c) critical literacy,d) sociocultural literacy. Article visualizations
USING ELECTRONIC TEXT CORPORA IN TEACHING ANCIENT GREEK: A VOCABULARY TEACHING INTERVENTION IMPLEMENTED IN THE ANCIENT GREEK COURSE IN THE 3RD GRADE OF LOWER SECONDARY SCHOOL
The present didactic intervention aims to highlight the effective use of Electronic Text Corpora in the teaching approach of the Ancient Greek course. In particular, the teaching of a unit found in the school textbook of the 3rd grade of lower secondary school is examined at its vocabulary and semantic level, using the Digital Resources (http://www.greek-language.gr/digitalResources/) for the Greek language and the Portal for the Greek language (http://www.greek-language.gr/greekLang/index.html). Using Electronic Text Corpora, students take part in the learning process through a critical way by building an interactive and communicative learning environment. The dynamic use of ETC in the teaching process can constitute the bridge between traditional and new literacy in the Information Society and Communication.
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Accuracy of site coordinates obtainable by a mobile lunar laser station
The accuracy with which a mobile lunar laser station can be located was the subject of a modeling study. The influence of the number and accuracy of fixed lunar ranging stations, the uncertainty in polar motion, and data loss due to weather and similar factors were considered, and the results are given in a cartographic form. In general, all three coordinates (for coordinates to latitude + or - 60 deg) were determined to better than the pole uncertainty, given three or more fixed sites and reasonable weather. This result indicates that one or more mobile stations would be suitable for the study of geotectonics
High-frequency modes in solar-like stars
p-mode oscillations in solar-like stars are excited by the outer convection
zone in these stars and reflected close to the surface. The p-modes are trapped
inside an acoustic cavity, but the modes only stay trapped up to a given
frequency (known as the acoustic cut-off frequency) as modes with larger
frequencies are generally not reflected at the surface. This means that modes
with frequency larger than the acoustic cut-off frequency must be traveling
waves. The high-frequency modes may provide information about the physics in
the outer layers of the stars and the excitation source and are therefore
highly interesting as it is the estimation of these two phenomena that causes
some of the largest uncertainties when calculating stellar oscillations.
High-frequency modes have been detected in the Sun, beta Hydri and in alpha Cen
A & B by smoothing the so-called echelle diagram and the large frequency
separation as a function of frequency have been estimated. The large frequency
separation has been compared with a simple model of the acoustic cavity which
suggests that the reflectivity of the photosphere is larger at high frequency
than predicted by standard models of the solar atmosphere and that the depth of
the excitation source is larger than what has been estimated by other models
and might depend on the order n and degree l of the modes.Comment: 11 pages, 5 figures. Accepted for publication in MNRA
The pulsating DA white dwarf star EC 14012-1446: results from four epochs of time-resolved photometry
The pulsating DA white dwarfs are the coolest degenerate stars that undergo
self-driven oscillations. Understanding their interior structure will help to
understand the previous evolution of the star. To this end, we report the
analysis of more than 200 h of time-resolved CCD photometry of the pulsating DA
white dwarf star EC 14012-1446 acquired during four observing epochs in three
different years, including a coordinated three-site campaign. A total of 19
independent frequencies in the star's light variations together with 148
combination signals up to fifth order could be detected. We are unable to
obtain the period spacing of the normal modes and therefore a mass estimate of
the star, but we infer a fairly short rotation period of 0.61 +/- 0.03 d,
assuming the rotationally split modes are l=1. The pulsation modes of the star
undergo amplitude and frequency variations, in the sense that modes with higher
radial overtone show more pronounced variability and that amplitude changes are
always accompanied by frequency variations. Most of the second-order
combination frequencies detected have amplitudes that are a function of their
parent mode amplitudes, but we found a few cases of possible resonantly excited
modes. We point out the complications in the analysis and interpretation of
data sets of pulsating white dwarfs that are affected by combination
frequencies of the form f_A+f_B-f_C intruding into the frequency range of the
independent modes.Comment: 14 pages, 6 figures, 6 tables. MNRAS, in pres
Asteroseismology with the WIRE satellite. I. Combining Ground- and Space-based Photometry of the Delta Scuti Star Epsilon Cephei
We have analysed ground-based multi-colour Stromgren photometry and
single-filter photometry from the star tracker on the WIRE satellite of the
delta scuti star Epsilon Cephei. The ground-based data set consists of 16
nights of data collected over 164 days, while the satellite data are nearly
continuous coverage of the star during 14 days. The spectral window and noise
level of the satellite data are superior to the ground-based data and this data
set is used to locate the frequencies. However, we can use the ground-based
data to improve the accuracy of the frequencies due to the much longer time
baseline. We detect 26 oscillation frequencies in the WIRE data set, but only
some of these can be seen clearly in the ground-based data. We have used the
multi-colour ground-based photometry to determine amplitude and phase
differences in the Stromgren b-y colour and the y filter in an attempt to
identify the radial degree of the oscillation frequencies. We conclude that the
accuracies of the amplitudes and phases are not sufficient to constrain
theoretical models of Epsilon Cephei. We find no evidence for rotational
splitting or the large separation among the frequencies detected in the WIRE
data set. To be able to identify oscillation frequencies in delta scuti stars
with the method we have applied, it is crucial to obtain more complete coverage
from multi-site campaigns with a long time baseline and in multiple filters.
This is important when planning photometric and spectroscopic ground-based
support for future satellite missions like COROT and KEPLER.Comment: 13 pages, 12 figures, 4 tables. Fig. 4 reduced in quality. Accepted
by A&
The CoRoT star 105288363: strong cycle to cycle changes of the Blazhko modulation
We present the analysis of the CoRoT star 105288363, a new Blazhko RR Lyrae
star of type RRab (f0 = 1.7623 c/d), observed with the CoRoT space craft during
the second long run in direction of the galactic center (LRc02, time base 145
d). The CoRoT data are characterized by an excellent time sampling and a low
noise amplitude of 0.07 mmag in the 2-12 c/d range and allow us to study not
only the fine details of the variability of the star but also long-term changes
in the pulsation behaviour and the stability of the Blazhko cycle. We use,
among other methods, standard Fourier analysis techniques and O-C diagrams to
investigate the pulsational behavior of the Blazhko star 105288363. In addition
to the frequency pattern expected for a Blazhko RR Lyrae star, we find an
independent mode (f1 = 2.984 c/d) showing a f0/f1 ratio of 0.59 which is
similar to that observed in other Blazhko RR Lyrae stars. The bump and hump
phenomena are also analysed, with their variations over the Blazhko cycle. We
carefully investigated the strong cycle-to-cycle changes in the Blazhko
modulation (PB = 35.6 d), which seem to happen independently and partly
diametrically in the amplitude and the phase modulation. Furthermore, the
phasing between the two types of modulation is found to change during the
course of the observations.Comment: 15 pages, 8 figures, accepted for publication in MNRA
Confirmation of simultaneous p and g mode excitation in HD 8801 and Gamma Peg from time-resolved multicolour photometry of six candidate "hybrid" pulsators
We carried out a multi-colour time-series photometric study of six stars
claimed as "hybrid" p and g mode pulsators in the literature. Gamma Peg was
confirmed to show short-period oscillations of the Beta Cep type and
simultaneous long-period pulsations typical of Slowly Pulsating B (SPB) stars.
From the measured amplitude ratios in the Stromgren uvy passbands, the
stronger of the two short period pulsation modes was identified as radial; the
second is l=1. Three of the four SPB-type modes are most likely l=1 or 2.
Comparison with theoretical model calculations suggests that Gamma Peg is
either an 8.5 solar mass radial fundamental mode pulsator or a 9.6 solar mass
first radial overtone pulsator. HD 8801 was corroborated as a "hybrid" Delta
Sct Gamma Dor star; four pulsation modes of the Gamma Dor type were detected,
and two modes of the Delta Sct type were confirmed. Two pulsational signals
between the frequency domains of these two known classes of variables were
confirmed and another was newly detected. These are either previously unknown
types of pulsation, or do not originate from HD 8801. The O-type star HD 13745
showed small-amplitude slow variability on a time scale of 3.2 days. This
object may be related to the suspected new type of supergiant SPB stars, but a
rotational origin of its light variations cannot be ruled out at this point. 53
Psc is an SPB star for which two pulsation frequencies were determined and
identified with low spherical degree. The behaviour of 53 Ari and Iota Her is
consistent with non-variability during our observations, and we could not
confirm light variations of the comparison star 34 Psc previously suspected.
The use of signal-to-noise criteria in the analysis of data sets with strong
aliasing is critically discussed.Comment: 14 pages, 10 figures, accepted by MNRA
Close binary stars in the solar-age Galactic open cluster M67
We present multi-colour time-series CCD photometry of the solar-age galactic
open cluster M67 (NGC 2682). About 3600 frames spread over 28 nights were
obtained with the 1.5 m Russian-Turkish and 1.2 m Mercator telescopes.
High-precision observations of the close binary stars AH Cnc, EV Cnc, ES Cnc,
the Scuti type systems EX Cnc and EW Cnc, and some long-period
variables belonging to M67 are presented. Three full multi-colour light curves
of the overcontact binary AH Cnc were obtained during three observing seasons.
Likewise we gathered three light curves of EV Cnc, an EB-type binary, and two
light curves of ES Cnc, a blue straggler binary. Parts of the light change of
long-term variables S1024, S1040, S1045, S1063, S1242, and S1264 are obtained.
Period variation analysis of AH Cnc, EV Cnc, and ES Cnc were done using all
times of mid-eclipse available in the literature and those obtained in this
study. In addition, we analyzed multi-colour light curves of the close binaries
and also determined new frequencies for the Scuti systems. The
physical parameters of the close binary stars were determined with simultaneous
solutions of multi-colour light and radial velocity curves. Finally we
determined the distance of M67 as 857(33) pc via binary star parameters, which
is consistent with an independent method from earlier studies.Comment: 12 pages, 9 Figures, 13 Table
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