Long-range exciton transport in brightly fluorescent furan/phenylene co-oligomer crystals

The design of light-emitting crystalline organic semiconductors for optoelectronic applications requires a thorough understanding of the singlet exciton transport process. In this study, we show that the singlet exciton diffusion length in a promising semiconductor crystal based on furan/phenylene co-oligomers is 24 nm. To achieve this, we employed the photoluminescence quenching technique using a specially synthesized quencher, which is a long furan/phenylene co-oligomer that was facilely implanted into the host crystal lattice. Extensive Monte-Carlo simulations, exciton-exciton annihilation experiments and numerical modelling fully supported our findings. We further demonstrated the high potential of the furan/phenylene co-oligomer crystals for light-emitting applications by fabricating solution-processed organic light emitting transistors

Tycho Reference Catalogue: Pilot Project Results

The Tycho Reference Catalogue (TRC) project is aimed at the derivation of highly accurate proper motions of about 1 000 000 stars observed within the Tycho experiment on board the ESA Hipparcos satellite. The unprecedented number of high-quality proper motions is due to the combination of the precise modern-epoch Tycho positions with the century-old Astrographic Catalogue data. Results of the pilot TRC project, presented here, show that final TRC could yield almost Hipparcos quality proper motions for practically all Tycho Catalogue stars

The Level of Political Culture of Modern Student Youth of the City of Yekaterinburg

There is no single interpretation of political culture, like its structural components, content, or functions. In relation to this problem there is a very different and wide range of opinions, definitions, formulations. This is also natural, since the complexity and multi-variability of the phenomenon of political culture, the impossibility of its reduction to any clearly outlined, well-established phenomenon is obvious.Единой трактовки политической культуры, как и ее структурных компонентов, содержания, функций, нет. По отношению к данной проблеме существует очень различный и широкий спектр мнений, определений, формулировок. Это и естественно, так как очевидна сложность и многовариативность явления политической культуры, невозможность ее сведения к какому-либо четко очерченному, твердо установившемуся феномену

Construction of the Tycho Reference Catalogue

The Tycho Reference Catalogue (TRC) project, as proposed in 1992 by the present authors, aimed to extend the Hipparcos reference system to fainter magnitudes. To assure rigidity of the reference system realization, the project relied on the Tycho Cataloguethat provides highly-accurate positions of more than one million stars on the Hipparcos system. To maintain the precision of the reference system over longer periods of time, high-precision proper motions must be derived from Tycho and earlier ground-based measurements, most notably the century-old Astrographic Catalogue(AC). The recently published first version of the Tycho Reference Catalogue provides highly-accurate positions and proper motions for 990 182 stars of the Tycho Catalogue. It realizes the ICRS/Hipparcos system in the optical domain with a median accuracy of 45 mas at epoch J2000.0. The realization is based on stars of median magnitude $B_{\mathrm{T}}=11.25$ mag, providing an average of 24 reference stars per square degree. The median accuracy of the TRC proper motions, estimated from external comparisons as 2.4 mas/yr, ensures a reference system realization with an accuracy better than 100 mas over the time span of a few decades. Highly-accurate astrometry combined with homogeneous two-colour Tycho photometry makes TRC an ideal choice for a wide range of astronomical applications. The present paper covers the major steps of the TRC construction, including the Astrographic Cataloguereduction onto the Hipparcos system, identification of the Tycho Catalogue stars in the AC, derivation of proper motions, a posteriori systematic corrections of the proper motions to account for residual AC systematic errors, and the TRC quality assessment. The relation of the TRC with the recently published ACT catalogue is outlined. A future version of the TRC, to be based on the new Tycho data processing and a global block adjustment of the Astrographic Catalogue, is briefly discussed

Construction of the Tycho Reference Catalogue

The Tycho Reference Catalogue (TRC) project, as proposed in 1992 by the present authors, aimed to extend the Hipparcos reference system to fainter magnitudes. To assure rigidity of the reference system realization, the project relied on the Tycho Cataloguethat provides highly-accurate positions of more than one million stars on the Hipparcos system. To maintain the precision of the reference system over longer periods of time, high-precision proper motions must be derived from Tycho and earlier ground-based measurements, most notably the century-old Astrographic Catalogue(AC). The recently published first version of the Tycho Reference Catalogue provides highly-accurate positions and proper motions for 990 182 stars of the Tycho Catalogue. It realizes the ICRS/Hipparcos system in the optical domain with a median accuracy of 45 mas at epoch J2000.0. The realization is based on stars of median magnitude $B_{\mathrm{T}}=11.25$ mag, providing an average of 24 reference stars per square degree. The median accuracy of the TRC proper motions, estimated from external comparisons as 2.4 mas/yr, ensures a reference system realization with an accuracy better than 100 mas over the time span of a few decades. Highly-accurate astrometry combined with homogeneous two-colour Tycho photometry makes TRC an ideal choice for a wide range of astronomical applications. The present paper covers the major steps of the TRC construction, including the Astrographic Cataloguereduction onto the Hipparcos system, identification of the Tycho Catalogue stars in the AC, derivation of proper motions, a posteriori systematic corrections of the proper motions to account for residual AC systematic errors, and the TRC quality assessment. The relation of the TRC with the recently published ACT catalogue is outlined. A future version of the TRC, to be based on the new Tycho data processing and a global block adjustment of the Astrographic Catalogue, is briefly discussed