The Experts below are selected from a list of 165639 Experts worldwide ranked by ideXlab platform
Wei Huang - One of the best experts on this subject based on the ideXlab platform.
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stable pure blue polymer light emitting devices based on β Phase poly 9 9 dioctylfluorene induced by 1 2 dichloroethane
Applied Physics Express, 2014Co-Authors: Xinwen Zhang, Zhenfeng Lei, Jinyi Lin, Yuehua Chen, Linghai Xie, Wenyong Lai, Wei HuangAbstract:Thin films of β-Phase poly(9,9-dioctylfluorene) (PFO) were realized by dipping amorphous-Phase PFO thin films in 1,2-dichloroethane for several seconds. Absorption, photoluminescence, and electroluminescence spectra indicate that the β-Phase is generated in the thin films. A stable pure-blue polymer light-emitting device based on the β-Phase PFO film was fabricated. The efficiency of the device with the β-Phase is increased to 2.53 cd/A, which is 3.3 times higher than that of the device with the amorphous Phase. Moreover, it is found that the device with β-Phase Emission shows high color purity as well as stable spectra.
J Spyromilio - One of the best experts on this subject based on the ideXlab platform.
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late time spectral line formation in type iib supernovae with application to sn 1993j sn 2008ax and sn 2011dh
Astronomy and Astrophysics, 2015Co-Authors: A Jerkstrand, M Ergon, S J Smartt, Claes Fransson, J Sollerman, S Taubenberger, Melina C Bersten, J SpyromilioAbstract:We investigate line formation processes in Type IIb supernovae (SNe) from 100 to 500 days post-explosion using spectral synthesis calculations. The modelling identifies the nuclear burning layers and physical mechanisms that produce the major Emission lines, and the diagnostic potential of these. We compare the model calculations with data on the three best observed Type IIb SNe to-date − SN 1993J, SN 2008ax, and SN 2011dh. Oxygen nucleosynthesis depends sensitively on the main-sequence mass of the star and modelling of the (O I) λλ6300, 6364 lines constrains the progenitors of these three SNe to the MZAMS = 12−16 Mrange (ejected oxygen masses 0.3−0.9 M� ), with SN 2011dh towards the lower end and SN 1993J towards the upper end of the range. The high ejecta masses from MZAMS 17 Mprogenitors give rise to brighter nebular Phase Emission lines than observed. Nucleosynthesis analysis thus supports a scenario of low-to-moderate mass progenitors for Type IIb SNe, and by implication an origin in binary systems. We demonstrate how oxygen and magnesium recombination lines may be combined to diagnose the magnesium mass in the SN ejecta. For SN 2011dh, a magnesium mass of 0.02−0.14 Mis derived, which gives a Mg/O production ratio consistent with the solar value. Nitrogen left in the He envelope from CNO burning gives strong (N II) λλ6548, 6583 Emission lines that dominate over Hα Emission in our models. The hydrogen envelopes of Type IIb SNe are too small and dilute to produce any noticeable Hα Emission or absorption after ∼150 days, and nebular Phase Emission seen around 6550 A is in many cases likely caused by (N II) λλ6548, 6583. Finally, the influence of radiative transport on the emergent line profiles is investigated. Significant line blocking in the metal core remains for several hundred days, which affects the emergent spectrum. These radiative transfer effects lead to early-time blueshifts of the Emission line peaks, which gradually disappear as the optical depths decrease with time. The modelled evolution of this effect matches the observed evolution in SN 2011dh.
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late time spectral line formation in type iib supernovae with application to sn 1993j sn 2008ax and sn 2011dh
arXiv: High Energy Astrophysical Phenomena, 2014Co-Authors: A Jerkstrand, M Ergon, S J Smartt, Claes Fransson, J Sollerman, S Taubenberger, Melina C Bersten, J SpyromilioAbstract:We investigate line formation processes in Type IIb supernovae (SNe) from 100 to 500 days post-explosion using spectral synthesis calculations. The modeling identifies the nuclear burning layers and physical mechanisms that produce the major Emission lines, and the diagnostic potential of these. We compare the model calculations with data on the three best observed Type IIb SNe to-date - SN 1993J, SN 2008ax, and SN 2011dh. Oxygen nucleosynthesis depends sensitively on the main-sequence mass of the star and modeling of the [O I] 6300, 6364 lines constrains the progenitors of these three SNe to the M_ZAMS=12-16 M_sun range (ejected oxygen masses 0.3-0.9 M_sun), with SN 2011dh towards the lower end and SN 1993J towards the upper end of the range. The high ejecta masses from M_ZAMS >= 17 M_sun progenitors give rise to brighter nebular Phase Emission lines than observed. Nucleosynthesis analysis thus supports a scenario of low/moderate mass progenitors for Type IIb SNe, and by implication an origin in binary systems. We demonstrate how oxygen and magnesium recombination lines may be combined to diagnose the magnesium mass in the SN ejecta. For SN 2011dh, a magnesium mass of of 0.02-0.14 M_sun is derived, which gives a Mg/O production ratio consistent with the solar value. Nitrogen left in the He envelope from CNO-burning gives strong [N II] 6548, 6583 Emission lines that dominate over H-alpha Emission in our models. The hydrogen envelopes of Type IIb SNe are too small and dilute to produce any noticeable H-alpha Emission or absorption after ~150 days, and nebular Phase Emission seen around 6550 A is in many cases likely caused by [N II] 6548, 6583. Finally, the influence of radiative transport on the emergent line profiles is investigated...(abridged)
Yu D Akimov - One of the best experts on this subject based on the ideXlab platform.
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purification of liquid xenon with the spark discharge technique for use in two Phase Emission detectors
Instruments and Experimental Techniques, 2017Co-Authors: Yu D Akimov, V Belov, A K Berdnikova, S V Bobkov, A Bolozdynya, A G Dolgolenko, P S Dzhumaev, Yu V Gusakov, D V Guss, A V KhromovAbstract:A procedure for spark-discharge purification of a liquid xenon sample with a mass of 55 kg is described. The average lifetime of ionization electrons before capture by electronegative impurities in liquid xenon increased from ≤ 0.1 μs to ≥ 50 μs for an electric field of 50–500 V/cm as a result of the procedure. The xenon purified with this method is intended for use in the RED-100 detector for observation of the process of coherent elastic neutrino scattering off xenon nuclei.
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search for elastic coherent neutrino scattering off atomic nuclei at the kalinin nuclear power plant
Physics Procedia, 2015Co-Authors: Yu D Akimov, Alexander A. Burenkov, V. A. Belov, Yu. Efremenko, Alex Bolozdynya, A EtenkoAbstract:Abstract We propose to detect and study neutrino neutral elastic coherent scattering off atomic nuclei with two-Phase Emission detector with liquid xenon as a target medium. One of the possible experimental site is a Kalinin Nuclear Power Plant (KNPP) situated in the Russian Federation. In this paper we discuss the design of the detector and expected signals and background for this site.
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prospects for observation of neutrino nuclear neutral current coherent scattering with two Phase xenon Emission detector
Journal of Instrumentation, 2013Co-Authors: Yu D Akimov, Alexander A. Burenkov, V. A. Belov, Alex Bolozdynya, I S Alexandrov, V I Aleshin, A S Chepurnov, M Danilov, A V Derbin, V V DmitrenkoAbstract:We propose to detect and to study neutrino neutral current coherent scattering off atomic nuclei with a two-Phase Emission detector using liquid xenon as a working medium. Expected signals and backgrounds are calculated for two possible experimental sites: the Kalinin Nuclear Power Plant in the Russian Federation and the Spallation Neutron Source at the Oak Ridge National Laboratory in the U.S.A. Both sites have advantages as well as limitations. The experiment looks feasible at either location.
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perspectives to measure neutrino nuclear neutral current coherent scattering with two Phase Emission detector
arXiv: Instrumentation and Detectors, 2012Co-Authors: Yu D Akimov, Alexander A. Burenkov, V. A. Belov, Alex Bolozdynya, I S Alexandrov, V I Aleshin, A S Chepurnov, A V Derbin, M V Danilov, V V DmitrenkoAbstract:We propose to detect and to study neutrino neutral current coherent scattering off atomic nuclei with a two-Phase Emission detector using liquid xenon as a working medium. Expected signals and backgrounds are calculated for two possible experimental sites: Kalinin Nuclear Power Plant in the Russian Federation and Spallation Neutron Source at the Oak Ridge National Laboratory in the USA. Both sites have advantages as well as limitations. However the experiment looks feasible at either location. Preliminary design of the detector and supporting R&D program are discussed.
A Jerkstrand - One of the best experts on this subject based on the ideXlab platform.
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late time spectral line formation in type iib supernovae with application to sn 1993j sn 2008ax and sn 2011dh
Astronomy and Astrophysics, 2015Co-Authors: A Jerkstrand, M Ergon, S J Smartt, Claes Fransson, J Sollerman, S Taubenberger, Melina C Bersten, J SpyromilioAbstract:We investigate line formation processes in Type IIb supernovae (SNe) from 100 to 500 days post-explosion using spectral synthesis calculations. The modelling identifies the nuclear burning layers and physical mechanisms that produce the major Emission lines, and the diagnostic potential of these. We compare the model calculations with data on the three best observed Type IIb SNe to-date − SN 1993J, SN 2008ax, and SN 2011dh. Oxygen nucleosynthesis depends sensitively on the main-sequence mass of the star and modelling of the (O I) λλ6300, 6364 lines constrains the progenitors of these three SNe to the MZAMS = 12−16 Mrange (ejected oxygen masses 0.3−0.9 M� ), with SN 2011dh towards the lower end and SN 1993J towards the upper end of the range. The high ejecta masses from MZAMS 17 Mprogenitors give rise to brighter nebular Phase Emission lines than observed. Nucleosynthesis analysis thus supports a scenario of low-to-moderate mass progenitors for Type IIb SNe, and by implication an origin in binary systems. We demonstrate how oxygen and magnesium recombination lines may be combined to diagnose the magnesium mass in the SN ejecta. For SN 2011dh, a magnesium mass of 0.02−0.14 Mis derived, which gives a Mg/O production ratio consistent with the solar value. Nitrogen left in the He envelope from CNO burning gives strong (N II) λλ6548, 6583 Emission lines that dominate over Hα Emission in our models. The hydrogen envelopes of Type IIb SNe are too small and dilute to produce any noticeable Hα Emission or absorption after ∼150 days, and nebular Phase Emission seen around 6550 A is in many cases likely caused by (N II) λλ6548, 6583. Finally, the influence of radiative transport on the emergent line profiles is investigated. Significant line blocking in the metal core remains for several hundred days, which affects the emergent spectrum. These radiative transfer effects lead to early-time blueshifts of the Emission line peaks, which gradually disappear as the optical depths decrease with time. The modelled evolution of this effect matches the observed evolution in SN 2011dh.
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late time spectral line formation in type iib supernovae with application to sn 1993j sn 2008ax and sn 2011dh
arXiv: High Energy Astrophysical Phenomena, 2014Co-Authors: A Jerkstrand, M Ergon, S J Smartt, Claes Fransson, J Sollerman, S Taubenberger, Melina C Bersten, J SpyromilioAbstract:We investigate line formation processes in Type IIb supernovae (SNe) from 100 to 500 days post-explosion using spectral synthesis calculations. The modeling identifies the nuclear burning layers and physical mechanisms that produce the major Emission lines, and the diagnostic potential of these. We compare the model calculations with data on the three best observed Type IIb SNe to-date - SN 1993J, SN 2008ax, and SN 2011dh. Oxygen nucleosynthesis depends sensitively on the main-sequence mass of the star and modeling of the [O I] 6300, 6364 lines constrains the progenitors of these three SNe to the M_ZAMS=12-16 M_sun range (ejected oxygen masses 0.3-0.9 M_sun), with SN 2011dh towards the lower end and SN 1993J towards the upper end of the range. The high ejecta masses from M_ZAMS >= 17 M_sun progenitors give rise to brighter nebular Phase Emission lines than observed. Nucleosynthesis analysis thus supports a scenario of low/moderate mass progenitors for Type IIb SNe, and by implication an origin in binary systems. We demonstrate how oxygen and magnesium recombination lines may be combined to diagnose the magnesium mass in the SN ejecta. For SN 2011dh, a magnesium mass of of 0.02-0.14 M_sun is derived, which gives a Mg/O production ratio consistent with the solar value. Nitrogen left in the He envelope from CNO-burning gives strong [N II] 6548, 6583 Emission lines that dominate over H-alpha Emission in our models. The hydrogen envelopes of Type IIb SNe are too small and dilute to produce any noticeable H-alpha Emission or absorption after ~150 days, and nebular Phase Emission seen around 6550 A is in many cases likely caused by [N II] 6548, 6583. Finally, the influence of radiative transport on the emergent line profiles is investigated...(abridged)
V V Dmitrenko - One of the best experts on this subject based on the ideXlab platform.
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prospects for observation of neutrino nuclear neutral current coherent scattering with two Phase xenon Emission detector
Journal of Instrumentation, 2013Co-Authors: Yu D Akimov, Alexander A. Burenkov, V. A. Belov, Alex Bolozdynya, I S Alexandrov, V I Aleshin, A S Chepurnov, M Danilov, A V Derbin, V V DmitrenkoAbstract:We propose to detect and to study neutrino neutral current coherent scattering off atomic nuclei with a two-Phase Emission detector using liquid xenon as a working medium. Expected signals and backgrounds are calculated for two possible experimental sites: the Kalinin Nuclear Power Plant in the Russian Federation and the Spallation Neutron Source at the Oak Ridge National Laboratory in the U.S.A. Both sites have advantages as well as limitations. The experiment looks feasible at either location.
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perspectives to measure neutrino nuclear neutral current coherent scattering with two Phase Emission detector
arXiv: Instrumentation and Detectors, 2012Co-Authors: Yu D Akimov, Alexander A. Burenkov, V. A. Belov, Alex Bolozdynya, I S Alexandrov, V I Aleshin, A S Chepurnov, A V Derbin, M V Danilov, V V DmitrenkoAbstract:We propose to detect and to study neutrino neutral current coherent scattering off atomic nuclei with a two-Phase Emission detector using liquid xenon as a working medium. Expected signals and backgrounds are calculated for two possible experimental sites: Kalinin Nuclear Power Plant in the Russian Federation and Spallation Neutron Source at the Oak Ridge National Laboratory in the USA. Both sites have advantages as well as limitations. However the experiment looks feasible at either location. Preliminary design of the detector and supporting R&D program are discussed.
