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1.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivanova N. B., Platunov M. S., Knyazev Yu. V., Kazak N. V., Bezmaternykh L. N., Eremin E. V., Vasiliev A. D.
Заглавие : Spin-glass magnetic ordering in CoMgGaO2BO3 ludwigite
Место публикации : Физ. низких температур: Физико-технический институт низких температур им. Б.И. Веркина НАН Украины, 2012. - Т. 38, Вып. 2. - С.214-217. - ISSN 0132-6414. - ISSN 1816-0328
Примечания : Библиогр.: 13 назв. - This work was supported by the Russian Foundation for Basic Research (project No. 09-02-00171-a), the Federal Agency for Science and Innovation (Rosnauka) (project No. MK-5632.2010.2), the Physics Division of the Russian Academy of Sciences, the program "Strongly Correlated Electrons" (project 2.3.1).
Предметные рубрики: AC Magnetic susceptibility
DC magnetization
Field cooled
Flux methods
Frequency dependent
Magnetic system
Magnetic transitions
Needle shape
Parent compounds
Spin-glasses freezing
Temperature dependencies
Unit-cell volume
Zero-field-cooled
Cobalt
Cobalt compounds
Freezing
Glass
Magnetic susceptibility
Magnetism
Single crystals
X-ray diffraction
Spin glass
Ключевые слова (''Своб.индексиров.''): spin-glass freezing--transition metal ludwigites
Аннотация: The single crystal needle shape samples of diamagnetically diluted cobalt ludwigite CoMgGaO2BO3 have been grown by the flux method. The results of x-ray diffraction and both dc and ac magnetic measurements are presented. The unit cell volume undergoes a noticable growth under dilution from 328.31 Å3 for the parent compound Co3O2BO3 to 345.46 Å3 for CoMgGaO2BO3. The temperature of magnetic transition is considerably lower for the latter compound (25 K against 43 Kfor Co3O2BO3). The dc magnetization temperature dependencies undergo the splitting of field cooled and zero-field cooled regimes and the ac magnetic susceptibility temperature dependencies are frequency dependent pointing out a possible spin-glass freezing in the magnetic system.
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2.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Сутормин, Виталий Сергеевич, Крахалев, Михаил Николаевич, Зырянов, Виктор Яковлевич
Заглавие : Динамика отклика электрооптической ячейки на основе слоя нематика с управляемым поверхностным сцеплением
Место публикации : Письма в журн. техн. физ. - 2013. - Т. 39, Вып. 13. - С. 1-8
Аннотация: Исследованы электрооптические характеристики ячейки на основе слоя нематического жидкого кристалла, управляемого за счет модификации поверхностного сцепления ионным сурфактантом. Использовалась инверсная мода эффекта, при этом нематик был сориентирован гомеотропно в исходном состоянии и переходил к гибридной гомеопланарной структуре под действием постоянного электрического поля. Рассмотрены зависимости динамических параметров оптического отклика от величины приложенного напряжения.
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3.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sutormin V. S., Krakhalev M. N., Zyryanov V. Ya.
Заглавие : The dynamics of the response of an electro-optic cell based on a nematic layer with controlled surface anchoring
Место публикации : Tech. Phys. Lett. - 2013. - Vol. 39, Is. 7. - P.583-586. - ISSN 1063-7850, DOI 10.1134/S1063785013070134
Аннотация: We investigate the electrooptical characteristics of a cell based on a nematic liquid crystal layer controlled with the use of modification of the surface anchoring by an ionic surfactant. The inverse mode of the effect is used with the nematic oriented homeotropically in the initial state and transferring to the hybrid homeoplanar structure in an applied dc electric field. We consider the applied voltage dependences of the dynamic parameters of the optical response. В© 2013 Pleiades Publishing, Ltd.
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4.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Rashchenko S. V., Likhacheva A. Y., Krylov A. S., Mikhno A. O.
Заглавие : Diamond anvil cell in high-pressure petrology: studying the metamorphic reactions in situ
Коллективы : International Eclogite Conference (10; 2013 ; Sept. ; 2-10; Courmayeur, Italy)
Место публикации : Int. Ecologite Conf.: Abstract Vol. - 2013. - P.104
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5.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volova T. G., Kiselev E. G., Shishatskaya E. I., Zhila N. O., Boyandin A. N., Syrvacheva D. A., Vinogradova O. N., Kalacheva G. S., Vasiliev A. D., Peterson I. V.
Заглавие : Cell growth and accumulation of polyhydroxyalkanoates from CO2 and H2 of a hydrogen-oxidizing bacterium, Cupriavidus eutrophus B-10646
Место публикации : Bioresource Technol. - 2013. - Vol. 146. - P.215-222. - ISSN 0960-8524, DOI 10.1016/j.biortech.2013.07.070
Ключевые слова (''Своб.индексиров.''): autotrophic synthesis--cupriavidus eutrophus--polyhydroxyalkanoates
Аннотация: Synthesis of polyhydroxyalkanoates (PHAs) by a new strain of Cupriavidus - Cupriavidus eutrophus B-10646 - was investigated under autotrophic growth conditions. Under chemostat, at the specific flow rate D=0.1h-1, on sole carbon substrate (CO2), with nitrogen, sulfur, phosphorus, potassium, and manganese used as growth limiting elements, the highest poly(3-hydroxybutyrate) [P(3HB)] yields were obtained under nitrogen deficiency. In batch autotrophic culture, in the fermenter with oxygen mass transfer coefficient 0.460h-1, P(3HB) yields reached 85% of dry cell weight (DCW) and DCW reached 50g/l. Concentrations of supplementary PHA precursor substrates (valerate, hexanoate, ?-butyrolactone) and culture conditions were varied to produce, for the first time under autotrophic growth conditions, PHA ter- and tetra-polymers with widely varying major fractions of 3-hydroxybutyrate, 4-hydroxybutyrate, 3-hydroxyvalerate, and 3-hydroxyhexanoate monomer units. Investigation of the high-purity PHA specimens showed significant differences in their physicochemical and physicomechanical properties. В© 2013 Elsevier Ltd.
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6.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Molokeev M. S., Misyul' S. V.
Заглавие : Structural changes during phase transitions and the critical and noncritical order parameters in the (NH4)3Nb(O2)2F4 crystal
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 54, Is. 1. - P.143-154. - ISSN 1063-7834, DOI 10.1134/S1063783412010234. - ISSN 1090-6460
Примечания : Cited References: 17. - This study was supported by the Russian Foundation for Basic Research (project no. 09-02-00062) and the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation (grant no. NSh-4645.2010.2).
Предметные рубрики: TRANSFORMATIONS
OXYFLUORIDE
CELL
Аннотация: The structures of two phases of the (NH4)3Nb(O2)2F4 crystal, namely, the parent cubic phase and the most distorted low-temperature phase, have been determined from data of an X-ray diffraction experiment performed for a powder sample. The profile and structural parameters have been refined according to the procedure implemented in the DDM program. The results obtained have been discussed with invoking the group-theoretical analysis of the complete order parameter condensate, which takes into account the critical and noncritical atomic displacements and allows the interpretation of the obtained experimental data. It has been found that the most probable sequence of structural transformations occurring in the crystal can be schematically represented in the following form: Fm3¯m−→−−−−(η1,η1,η)Γ+5(11−7)C2/m−→−−−−−−−−−−−−−−−−(η1,η1,η)(0,0,0,0,0,ξ,0−ξ,0,0,0,0)Γ+5(11−7)⊗Σ2(4−2)P21/m−→−−−−−−−−−−−−−−−−−−−−−−−−−−−−(η1,η1,η)(0,0,0,0,0,ξ,0−ξ,0,0,0,0)(0,0,0,0,0,ε,0,ε,0,0,0,0)Γ+5(11−7)⊗Σ2(4−2)⊗Σ3(4−3)P21/n.\begin{gathered} Fm\bar 3m\xrightarrow[{(\eta 1,\eta 1,\eta )}]{{\Gamma _5. + (11 - 7)}}C2/m\xrightarrow[{(\eta 1,\eta 1,\eta )(0,0,0,0,0,\xi ,0 - \xi ,0,0,0,0)}]{{\Gamma _5. + (11 - 7) \otimes \Sigma _2 (4 - 2)}}P2_1 /m \hfill \\ \xrightarrow[{(\eta 1,\eta 1,\eta )(0,0,0,0,0,\xi ,0 - \xi ,0,0,0,0)(0,0,0,0,0,\varepsilon ,0,\varepsilon ,0,0,0,0)}]{{\Gamma _5. + (11 - 7) \otimes \Sigma _2 (4 - 2) \otimes \Sigma _3 (4 - 3)}}P2_1 /n. \hfill \\ \end{gathered}
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7.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sutormin V. S., Krakhalev M. N., Prishchepa O. O., Lee W., Zyryanov V. Ya.
Заглавие : Electro-optical response of an ionic-surfactantdoped nematic cell with homeoplanar-twisted configuration transition
Коллективы : Russian Foundation for Basic Research [12-03-00816]; Siberian Branch of the Russian Academy of Sciences (SB RAS) [30, 24.32]; Ministry of Science and Technology of Taiwan through an NSC-SB-RAS joint project [NSC 103-2923-M-009-003-MY3]
Место публикации : Opt. Mater. Express: Optical Society of America, 2014. - Vol. 4, Is. 4. - P.810-815. - ISSN 2159-3930, DOI 10.1364/OME.4.000810
Примечания : Cited References: 16. - This work was partially supported by the Russian Foundation for Basic Research (project No. 12-03-00816), and by the Siberian Branch of the Russian Academy of Sciences (SB RAS) through Grants Nos. 30, 24.32, and by the Ministry of Science and Technology of Taiwan under Grant No. NSC 103-2923-M-009-003-MY3 through an NSC-SB-RAS joint project.
Предметные рубрики: LIQUID-CRYSTAL
ORIENTATION
SURFACES
LAYER
Аннотация: This study is concerned with the optical response of an electro-optical material consisting of nematic liquid crystal as well as ionic surfactant as a dopant. The dopant is a key component to carry out the working of the resulting device through configuration switching. The operational principle is based on the surface anchoring transition induced by a steady electric field. The dynamic characteristics of the electro-optical cell can be considerably improved when the nematic layer is reoriented from the initially homeoplanar director configuration into the twisted state. Besides, a method to shorten the relaxation time is demonstrated by using a controlling pulse with a bipolar waveform. (C)2014 Optical Society of America
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8.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Wang H. T., Timofeev I. V., Chang K., Zyryanov V. Ya., Lee W.
Заглавие : Tunable narrow-bandpass filter based on an asymmetric photonic bandgap structure with a dual-mode liquid crystal
Коллективы : Ministry of Science and Technology of Taiwan [NSC 101-2112-M-009-018-MY3, NSC 103-2923-M-009-003-MY3]; Russian Foundation for Basic Research [14-02-3124814]; Siberian Branch of the Russian Academy of Sciences [43, 24.29 and 101]
Место публикации : Opt. Express: Optical Society of America, 2014. - Vol. 22, Is. 12. - P.15097-15103. - ISSN 1094-4087, DOI 10.1364/OE.22.015097
Примечания : Cited References: 23. - This work was supported by the Ministry of Science and Technology of Taiwan through Grant No. NSC 101-2112-M-009-018-MY3 as well as Grant No. NSC 103-2923-M-009-003-MY3 dedicated to a joint project between Taiwan and Russia. Both I. V. Timofeev and V. Ya. Zyryanov would like to thank the Russian Foundation for Basic Research (project No. 14-02-3124814) and the Siberian Branch of the Russian Academy of Sciences (grants Nos. 43, 24.29 and 101).
Предметные рубрики: DEVICE
LAYER
CELL
Аннотация: A one-dimensional asymmetric photonic crystal with dual-frequency liquid crystal as a central defect layer was demonstrated. Such asymmetric structure was characterized by the dramatic increase in intensity of the electric field of light localized at the overlapped photonic bandgap edges, thereby enhancing the observed transmittance of the spectral windows originating from the defect layer. The defect layer was made of a dual-mode liquid crystal that exhibited not only electrical tunability and switchability but also optical bistability. Consequently, tunable and bistable defect modes can be realized in the photonic structure. This asymmetric photonic crystal structure is promising and should be further explored for photonic device applications. (C) 2014 Optical Society of America
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9.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Goryainov S. V., Krylov A. S., Vtyurin A. N., Pan Y.
Заглавие : Raman study of datolite CaBSiO4(OH) at simultaneously high pressure and high temperature
Коллективы : Russian Foundation for Basic Research [N 14-05-00616, 13-05-00185], Ministry of Education and Science of the Russian Federation
Место публикации : J. Raman Spectrosc.: Wiley-Blackwell, 2015. - Vol. 46, Is. 1. - P.177-181. - ISSN 0377, DOI 10.1002/jrs.4614. - ISSN 10974555(eISSN)
Примечания : Cited References:30. - This work was partly supported by the Russian Foundation for BasicResearch (grants N 14-05-00616 and 13-05-00185) and the Ministry ofEducation and Science of the Russian Federation.
Предметные рубрики: X-RAY-DIFFRACTION
CRYSTAL-STRUCTURE
HYDROGEN-BOND
SPECTROSCOPY
Ключевые слова (''Своб.индексиров.''): raman spectra--datolite--high pressure--high temperature--diamond anvil--cell
Аннотация: Using an in situ method of Raman spectroscopy and resistance-heated diamond anvil cell, the system datolite CaBSiO4(OH) – water has been investigated at simultaneously high pressure and temperature (up to Р ~5 GPa and Т ~250 °С). Two polymorphic transitions have been observed: (1) pressure-induced phase transition or the feature in pressure dependence of Raman band wavenumbers at P = 2 GPа and constant T = 22 °С and (2) heating-induced phase transition at T ~90 °С and P ~5 GPа. The number of Raman bands is retained at the first transition but changed at the second transition. The first transition is mainly distinguished by the changes in the slopes of pressure dependence of Raman peaks at 2 GPa. The second transition is characterized by several strong changes: the wavenumber jumps of major bands, the merging of strong doublets at 378 and 391 cm−1 (values for ambient conditions), the splitting of the intermediate-intensity band at 292 cm−1, and the transformation of some low-wavenumber bands at 160–190 cm−1. No spectral and visual signs of overhydration and amorphization have been observed. No noticeable dissolution of datolite in the water medium occurred at 5 GPa and 250 °С after 3 h, which corresponds to typical conditions of the ‘cold’ zones of slab subduction. Copyright © 2014 John Wiley & Sons, Ltd.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Timofeev I. V., Gunyakov V. A., Sutormin V. S., Myslivets S. A., Arkhipkin V. G., Vetrov S. Ya., Lee W., Zyryanov V. Ya.
Заглавие : Geometric phase and ο-mode blueshift in a chiral anisotropic medium inside a Fabry-Pérot cavity
Место публикации : Phys. Rev. E: American Physical Society, 2015. - Vol. 92, Is. 5. - Ст.052504. - ISSN 15393755 (ISSN), DOI 10.1103/PhysRevE.92.052504
Примечания : Cited References: 92. - This work was supported in part by Russian Foundation for Basic Research Grants No. 14-02-31248 and No. 15-02-06924; Ministry of Education and Science of the Russian Federation under the Government program, Project No. 3.1276.2014/K; and the Ministry of Science and Technology of Taiwan under Grant No. NSC 103-2923-M-009-003-MY3 through an NSC–SB RAS joint project
Предметные рубрики: NEMATIC LIQUID-CRYSTAL
DIMENSIONAL PHOTONIC CRYSTAL
OPTICAL-PROPERTIES
ELECTROMAGNETIC PROPAGATION
DISPLAYS
SYSTEMS
FILTER
LIGHT
CELL
FORMULATION
Аннотация: Anomalous spectral shift of transmission peaks is observed in a Fabry-Pérot cavity filled with a chiral anisotropic medium. The effective refractive index value resides out of the interval between the ordinary and the extraordinary refractive indices. The spectral shift is explained by contribution of a geometric phase. The problem is solved analytically using the approximate Jones matrix method, numerically using the accurate Berreman method, and geometrically using the generalized Mauguin-Poincaré rolling cone method. The o-mode blueshift is measured for a 4-methoxybenzylidene-4′-n-butylaniline twisted-nematic layer inside the Fabry-Pérot cavity. The twist is electrically induced due to the homeoplanar-twisted configuration transition in an ionic-surfactant-doped liquid crystal layer. Experimental evidence confirms the validity of the theoretical model. © 2015 American Physical Society.
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