1,107 research outputs found
Secondary analysis of qualitative data: Hungarian minority kindergarten pedagoguesâ perspectives of the new curriculum framework in Serbia
Secondary analysis is employed to address new research questions by analysing previously collected data. This paper reports on the secondary analysis of qualitative data where the original research investigated the preschool education reform in Serbia from the perspective of Hungarian ethnic minority kindergarten pedagogues. The choice to apply a secondary analysis fulfilled the aims of (i) investigating traces of socialism in Early Childhood Education and Care (ECEC) provision in Vojvodina, a northern region of Serbia; and (ii) exploring the complexity of Christmas celebrations in nurseries. In order to address the aims, a secondary analysis of 12 semi-structured transcripts was carried out. This analysis revealed important additional findings for the original study. In light of the education reforms in Serbia we found that, first, there are strong connections between the âsocialist pastâ ECEC practices and what these practices may look like in the future; and, second, the traditional celebration of religious holidays outside of church organizations, such as Christmas, may change in the nurseries. This paper also offers insight regarding the importance of secondary analysis which provides an opportunity to making use of existing resources
szĂnkĂ©pzĂ©s mĂłdszerei a festĂ©szetben
Dolgozatomban a festĂ©szeti szĂnkĂ©pzĂ©stechnika problĂ©makörĂ©vel foglalkozom. A kĂ©palkotĂĄs Ă©s a festĂ©szeti nyelv komplexitĂĄsĂĄban a szĂnkĂ©pzĂ©stechnika helye ott van, ahol a âHogyan festette/festenĂ©d meg?â kĂ©rdĂ©se megvĂĄlaszolhatĂł. A szĂnek szĂnkĂ©pzĂ©stechnikai megközelĂtĂ©se a festĆi alkotĂłfolyamat gyakorlati szempontjait Ă©rinti: mikĂ©nt lehet megfesteni egy-egy szĂnĂĄllapotot Ă©s mik azok a tĂ©nyezĆk, amelyek ezt meghatĂĄrozhatjĂĄk. A kĂ©rdĂ©sre adott vĂĄlasz nem a tĂĄrgyak megnevezĂ©sĂ©hez, vagy a hozzĂĄjuk kötĆdĆ fogalmakhoz, hanem a vizuĂĄlisan ishatĂł Ă©lmĂ©nyek kĂ©pi megfogalmazĂĄsĂĄhoz vezet. Kandinszkij felhĂvja a figyelmet az Ă©rzĂ©kszerveink ĂĄltal befoghatĂł Ă©s befogadhatĂł jelensĂ©gek egymĂĄsra hatĂĄsĂĄra â Ășgy gondolom â, nemcsak a festĆk nem mondhatnak le a lĂĄthatĂł Ă©s a nem lĂĄthatĂł valĂłsĂĄg megtapasztalĂĄsĂĄrĂłl, Ă©lmĂ©nyeink sokrĂ©tƱsĂ©gĂ©nek felismerĂ©sĂ©rĆl. A festĆ a szĂnek ĂĄltal lĂĄthatĂłvĂĄ tesz; festĆkĂ©nt tehĂĄt kivĂĄltkĂ©pp nĂ©lkĂŒlözhetetlen Ă©s elengedhetetlen a festĆi aktus, az alkotĂłfolyamat beteljesĂtĂ©sĂ©hez egyrĂ©szt a termĂ©szetben lĂĄthatĂł szĂnek Ă©s formĂĄk tanulmĂĄnyozĂĄsa, mĂĄsrĂ©szt a vizuĂĄlis nyelv hasznĂĄlatĂĄnak elsajĂĄtĂtĂĄsa, Ă©s nem utolsĂł sorban pedig a festĂ©szeti anyagok Ă©s technikĂĄk ismerete. Amennyiben festĂ©szeti tanulmĂĄnyaink sorĂĄn a MestersĂ©gbeli TudĂĄs vĂ©rĂŒnkkĂ© vĂĄlik, Ășgy akkor is magĂĄtĂłl Ă©rtetĆdĆen hasznĂĄljuk majd a vizuĂĄlis nyelvet Ă©s a festĂ©szeti anyagokat, amikor festĂ©s közben az alkotĂłfolyamat mechanizmusai esetleg mĂĄsra irĂĄnyĂtjĂĄk a figyelmĂŒnket, Ă©s a megvalĂłsĂtĂĄs gyakorlati Ă©s technikai kĂ©rdĂ©sei legfeljebb csak a kĂ©pre-figyelĂ©s perifĂ©riĂĄjĂĄn kaphatnak helyet
Computing behind the iron curtain and beyond hungarian national perspective
At the beginning of the computing era it was a great challenge to write a running program in order to solve different mathematical, statistical tasks, and to get the appropriate results by using a computer. At the university where I had began my studies we started to get acquainted with computers using a Russian made machine, named URAL 2. Looking back to the roots and thinking of the Hungarian born pioneer of computer science: the polymath John von Neumann, I had intended to deal with the history of computing at the very beginning of the eighties. Although there is a wide range of computing history literature worldwide (most of them in English), there are not any publications dealing with the Hungarian results. As I was one of the first graduates on computing taught by the Pioneers, I am forced to perform research on all materials dealing with the Hungarian achievements in computing, to protect the values of the past as long as it is not too late and also to make the results known!2nd IFIP Conference on the History of Computing and EducationRed de Universidades con Carreras en InformĂĄtica (RedUNCI
Bayesian Reconstruction of Gravitational-wave Signals from Binary Black Holes with Nonzero Eccentricities
We present a comprehensive study on how well gravitational-wave signals of
binary black holes with nonzero eccentricities can be recovered with state of
the art model-independent waveform reconstruction and parameter estimation
techniques. For this we use BayesWave, a Bayesian algorithm used by the
LIGO-Virgo Collaboration for unmodeled reconstructions of signal waveforms and
parameters. We used two different waveform models to produce simulated signals
of binary black holes with eccentric orbits and embed them in samples of
simulated noise of design-sensitivity Advanced LIGO detectors. We studied the
network overlaps and point estimates of central moments of signal waveforms
recovered by BayesWave as a function of , the eccentricity of the binary at
8 Hz orbital frequency. BayesWave recovers signals of near-circular
() and highly eccentric () binaries with network
overlaps similar to that of circular () ones, however it produces lower
network overlaps for binaries with . Estimation errors on
central frequencies and bandwidths (measured relative to bandwidths) are nearly
independent from , while estimation errors on central times and durations
(measured relative to durations) increase and decrease with above
, respectively. We also tested how BayesWave performs when
reconstructions are carried out using generalized wavelets with linear
frequency evolution (chirplets) instead of sine-Gaussian wavelets. We have
found that network overlaps improve by percent when chirplets are
used, and the improvement is the highest at low () eccentricities. There
is however no significant change in the estimation errors of central moments
when the chirplet base is used.Comment: 16 pages, 9 figures, accepted for publication in CQ
Detecting Long-Duration Narrow-Band Gravitational Wave Transients Associated with Soft Gamma Repeater Quasi-Periodic Oscillations
We have performed an in-depth concept study of a gravitational wave data
analysis method which targets repeated long quasi-monochromatic transients
(triggers) from cosmic sources. The algorithm concept can be applied to
multi-trigger data sets in which the detector-source orientation and the
statistical properties of the data stream change with time, and does not
require the assumption that the data is Gaussian. Reconstructing or limiting
the energetics of potential gravitational wave emissions associated with
quasi-periodic oscillations (QPOs) observed in the X-ray lightcurve tails of
soft gamma repeater flares might be an interesting endeavour of the future.
Therefore we chose this in a simplified form to illustrate the flow,
capabilities, and performance of the method. We investigate performance aspects
of a multi-trigger based data analysis approach by using O(100 s) long
stretches of mock data in coincidence with the times of observed QPOs, and by
using the known sky location of the source. We analytically derive the PDF of
the background distribution and compare to the results obtained by applying the
concept to simulated Gaussian noise, as well as off-source playground data
collected by the 4-km Hanford detector (H1) during LIGO's fifth science run
(S5). We show that the transient glitch rejection and adaptive differential
energy comparison methods we apply succeed in rejecting outliers in the S5
background data. Finally, we discuss how to extend the method to a network
containing multiple detectors, and as an example, tune the method to maximize
sensitivity to SGR 1806-20 flare times.Comment: 11 pages, 8 figure
Recovering a spinning inspiralling compact binary waveform immersed in LIGO-like noise with spinning templates
We investigate the recovery chances of highly spinning waveforms immersed in
LIGO S5-like noise by performing a matched filtering with 10^6 randomly chosen
spinning waveforms generated with the LAL package. While the masses of the
compact binary are reasonably well recovered (slightly overestimated), the same
does not hold true for the spins. We show the best fit matches both in the
time-domain and the frequency-domain. These encompass some of the spinning
characteristics of the signal, but far less than what would be required to
identify the astrophysical parameters of the system. An improvement of the
matching method is necessary, though may be difficult due to the noisy signal.Comment: 5 pages, 1 figure + 4 figure panels; Proceedings of the Eight Edoardo
Amaldi Conference on Gravitational Waves (Amaldi8), New York, 2009; to be
published in J. Phys.: Conf. Series (JPCS
Global Optimization for Future Gravitational Wave Detectors' Sites
We consider the optimal site selection of future generations of gravitational
wave detectors. Previously, Raffai et al. optimized a 2-detector network with a
combined figure of merit. This optimization was extended to networks with more
than two detectors in a limited way by first fixing the parameters of all other
component detectors. In this work we now present a more general optimization
that allows the locations of all detectors to be simultaneously chosen. We
follow the definition of Raffai et al. on the metric that defines the
suitability of a certain detector network. Given the locations of the component
detectors in the network, we compute a measure of the network's ability to
distinguish the polarization, constrain the sky localization and reconstruct
the parameters of a gravitational wave source. We further define the
`flexibility index' for a possible site location, by counting the number of
multi-detector networks with a sufficiently high Figure of Merit that include
that site location. We confirm the conclusion of Raffai et al., that in terms
of flexibility index as defined in this work, Australia hosts the best
candidate site to build a future generation gravitational wave detector. This
conclusion is valid for either a 3-detector network or a 5-detector network.
For a 3-detector network site locations in Northern Europe display a comparable
flexibility index to sites in Australia. However for a 5-detector network,
Australia is found to be a clearly better candidate than any other location.Comment: 30 pages, 23 figures, 2 table
A statistical method to search for recoiling supermassive black holes in active galactic nuclei
We propose an observational test for gravitationally recoiling supermassive black holes (BHs) in active galactic nuclei, based on a
correlation between the velocities of BHs relative to their host galaxies, |Îv|, and their obscuring dust column densities, ÎŁdust
(both measured along the line of sight). We use toy models for the distribution of recoil velocities, BH trajectories, and the
geometry of obscuring dust tori in galactic centres, to simulate 2.5 Ă 105 random observations of recoiling quasars. BHs with
recoil velocities comparable to the escape velocity from the galactic centre remain bound to the nucleus, and do not fully settle
back to the centre of the torus due to dynamical friction in a typical quasar lifetime. We find that |Îv| and ÎŁdust for these BHs
are positively correlated. For obscured (ÎŁdust > 0) and for partially obscured (0 < ÎŁdust âČ 2.3 g mâ2) quasars with |Îv| â„ 45 km
sâ1, the sample correlation coefficient between log10(|Îv|) and ÎŁdust is r45 = 0.28 ± 0.02 and r45 = 0.13 ± 0.02, respectively.
Allowing for random ± 100 km sâ 1 errors in |Îv| unrelated to the recoil dilutes the correlation for the partially obscured
quasars to r45 = 0.026 ± 0.004 measured between |Îv| and ÎŁdust. A random sample of âł 3500 obscured quasars with |Îv| â„
45 km sâ1 would allow rejection of the no-correlation hypothesis with 3Ï significance 95 per cent of the time. Finally, we find
that the fraction of obscured quasars, obs (|Îv|), decreases with |Îv| from obs (103 km sâ1) âČ 0.4.
This predicted trend can be compared to the observed fraction of type II quasars, and can further test combinations of recoil,
trajectory, and dust torus models
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