801 research outputs found
Search for and investigation of new stellar clusters using the data from huge stellar catalogues
We present new automatic methods of search for star clusters using the data
available in new huge stellar catalogues. Using 2MASS catalogue we have
discovered over ten new open clusters in the region of Galaxy anticenter and
determined their physical parameters.Comment: Proceedings of the 79th Annual Scientific Meeting of the
Astronomische Gesellschaft, Cologne(Germany), September 200
On Testing Entropic Inequalities for Superconducting Qudit
The aim of this work is to verify the new entropic and information
inequalities for non-composite systems using experimental density
matrix of the qudit state, measured by the tomographic method in a multi-level
superconducting circuit. These inequalities are well-known for bipartite and
tripartite systems, but have never been tested for superconducting qudits.
Entropic inequalities can also be used to evaluate the accuracy of experimental
data and the value of mutual information, deduced from them, may charachterize
correlations between different degrees of freedom in a noncomposite system.Comment: 5 pages, 6 figure
Personalization and User Modeling in Adaptive E-Learning Systems for Schools
The manuscript presents a model for the personalization of e-Learning systems in secondary schools. Approaches are discussed about the implementation of this model by the application of the SCORM-standard, ITL (ITL-Interval and temporal logic), policies, etc. Comments on the possibilities for increasing the relevance of e-Learning systems in the real classroom environment schools are also included
A new look at Sco OB1 association with Gaia DR2
We present and discuss photometric optical data in the area of the OB
association Sco OB1 covering about 1 squared degree. UBVI photometry is
employed in tandem with Gaia DR2 data to investigate the 3 dimensional
structure and the star formation history of the region. By combining parallaxes
and proper motions we identify 7 physical groups located between the young open
cluster NGC 6231 and the bright nebula IC4628. The most prominent group
coincides with the sparse open cluster Trumpler 24. We confirm the presence of
the intermediate age star cluster VdB-Hagen 202, which is unexpected in this
environment, and provide for the first time estimates of its fundamental
parameters. After assessing individual groups membership, we derive mean proper
motion components, distances, and ages. The seven groups belong to two
different families. To the younger family (family I) belong several pre-Main
Sequence stars as well. These are evenly spread across the field, and also in
front of VdB-Hagen 202. VdB-Hagen 202 and two smaller, slightly detached,
groups of similar properties form family II, which do not belong to the
association, but are caught in the act of passing through it. As for the
younger population, this forms an arc-like structure from the bright nebula IC
4628 down to NGC 6231, as previously found. Moreover, the pre-Main Sequence
stars density seems to increase from NGC 6231 northward to Trumpler 24
Char-RNN and Active Learning for Hashtag Segmentation
We explore the abilities of character recurrent neural network (char-RNN) for
hashtag segmentation. Our approach to the task is the following: we generate
synthetic training dataset according to frequent n-grams that satisfy
predefined morpho-syntactic patterns to avoid any manual annotation. The active
learning strategy limits the training dataset and selects informative training
subset. The approach does not require any language-specific settings and is
compared for two languages, which differ in inflection degree.Comment: to appear in Cicling201
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