Double-exciton component of the cyclotron spin-flip mode in a quantum Hall ferromagnet

We report on the calculation of the cyclotron spin-flip excitation (CSFE) in a spin-polarized quantum Hall system at unit filling. This mode has a double-exciton component which contributes to the CSFE correlation energy but can not be found by means of a mean field approach. The result is compared with available experimental data.Comment: 9 pages, 2 figure

Investigation of the influence of carbon alloying on structure formation and thermal properties of new carbon-containing superinvar alloys

В работе изучены суперинварные сплавы на Fe-Ni-Co основе с дополнительным легированием углеродом в широком диапазоне (0,6%, 0,8% и 1,7% С). По результатам металлографического анализа показано, что графит распространен по всему объёму шлифа в мелкодисперсном состоянии, причем при повышении содержания в сплаве графитные включения становятся крупнее. Показано, что после термических обработок по режимам отжига (680С, 3ч; 800С, 3ч), закалки в воду от 860С и закалки в воду от 860С с последующим низкотемпературным отпуском (315 С, 1,5ч) может происходить изменение морфологии графитных включений. По результатам термического анализа предложено повышать температуру отжига до 800С с целью более полного завершения процессов графитизации. Также показано, что после отжига по режиму 800С, 3ч анализируемые сплавы проявляют минимальные значения температурного коэффициента линейного расширения (20-100 < 1,510-6К-1).Super-invar alloys based on Fe-Ni-Co with additions of carbon in wide range (0,6%, 0,8% and 1,7% С) have been investigated. Metallography analysis showed that graphite phase distributed throughout the volume of alloy in a fine state. Moreover, the size of graphite inclusions rises with the increasing of the total contents of carbon. It is showed, that after a heat treatment the morphology of graphite phases may change. Thermal analysis revealed that it is necessary to up the temperature of annealing unto 800С because at that temperature the graphitization processes proceeds more fully. It is also showed that after annealing (800С, 3h) investigated alloys induce minimal thermal expansion (20-100 < 1,510-6К-1).Программа развития УрФУ на 2013 год (п.2.1.1.1

Neural Cross-Lingual Named Entity Recognition with Minimal Resources

For languages with no annotated resources, unsupervised transfer of natural language processing models such as named-entity recognition (NER) from resource-rich languages would be an appealing capability. However, differences in words and word order across languages make it a challenging problem. To improve mapping of lexical items across languages, we propose a method that finds translations based on bilingual word embeddings. To improve robustness to word order differences, we propose to use self-attention, which allows for a degree of flexibility with respect to word order. We demonstrate that these methods achieve state-of-the-art or competitive NER performance on commonly tested languages under a cross-lingual setting, with much lower resource requirements than past approaches. We also evaluate the challenges of applying these methods to Uyghur, a low-resource language.Comment: EMNLP 2018 long pape

Stability of Spatio-Temporal Structures in a Lattice Model of Pulse-Coupled Oscillators

We analyze the collective behavior of a lattice model of pulse-coupled oscillators. By studying the intrinsic dynamics of each member of the population and their mutual interactions we observe the emergence of either spatio-temporal structures or synchronized regimes. We perform a linear stability analysis of these structures.Comment: 15 pages, 2 PostScript available upon request at [email protected], Accepted in Physica

Influence of Silicon on Thermal Conductivity at Room Temperature of Al–Si–Fe Alloys

The analysis of densities and thermal conductivities has been performed for cast experimentally made aluminum alloys containing different content of silicon starting from 0% to 12% (mass%). All alloys have been additionally supplemented by iron up to 1% mass for better casting properties. Results have shown a strong tendency of decrease in the thermal conductivity with increasing silicon content. The same character is found for densities behavior. Keywords: aluminum-silicon alloys, thermal conductivity, heat exchange, iron, cast alloys, structure, temperatur