185 research outputs found
Late Permian paleomagnetic results from the Lodève, Le Luc, and Bas-Argens Basins (southern France): Magnetostratigraphy and geomagnetic field morphology
Β© 2014 Elsevier B.V. Paleomagnetic results are presented from 271 stratigraphically-ordered horizons at four locations in southern France. Our focus is mainly on the Late Permian (258 horizons), but results from 13 horizons in the Triassic Buntsandstein are also reported. We argue that the Permian results extend magnetostratigraphic coverage up to the upper Capitanian Stage, some 6 million years after the end of the Permo-Carboniferous Reversed Superchron defined by the Illawarra Reversal in the Wordian Stage. When combined with published data, an overall mean paleopole at 49Β°N, 161Β°E (A95=4Β°, N=9) is obtained. This is virtually identical to the upper Permian pole obtained by Bazhenov and Shatsillo (2010) using the intersecting great-circle method. Agreement between the two procedures, which are based on entirely independent data, supports the geocentric axial dipole (GAD) model
Organization and management of clusters in Russia in the context of import substitution
The article covers the trends of the agribusiness development in Russia. It is shown that it is desirable to develop organizational-economic forms of entrepreneurship based on the cluster approach in the modern realities.
The most famous agribusiness clusters in the world are explored. Regions of Russia that have achieved the most significant results in agribusiness clustering are mentioned. It is found that the establishment of agribusiness in Russia is defined by the political decision of regional authorities rather than based on research and development.
An algorithm for establishing the agribusiness cluster is proposed, which includes four stages: methodological, analytical, organizational-economic and control.
The key areas of state support for the development of agribusiness clusters in Russia are defined.peer-reviewe
Paleomagnetism of Mesoproterozoic margins of the Anabar Shield: A hypothesized billion-year partnership of Siberia and northern Laurentia
Β© 2016 Elsevier B.V.Siberia and Laurentia have been suggested as near neighbors in Proterozoic supercontinents Nuna and Rodinia, but paleomagnetic evidence has been sparse and ambiguous. Here we present four new paleomagnetic poles from undeformed Paleo-Mesoproterozoic (lower Riphean) sedimentary rocks and mafic intrusions of the northwestern Anabar uplift in northern Siberia. Combining these results with other Proterozoic data from Siberia and Laurentia, we propose a tight juxtaposition of those two blocks (Euler parameters 77Β°, 098Β°, 137Β° for Anabar to North America) spanning the interval 1.7β0.7Β Ga, constituting a long-lived connection that outlasted both the Nuna and Rodinia supercontinental assemblages
Top-side ionosphere response to extreme solar events
International audienceStrong X-flares and solar energetic particle (SEP) fluxes are considered as sources of topside ionospheric disturbances observed by the ROCSAT-1/IPEI instrument during the Bastille Day event on 14 July 2000 and the Halloween event on 28 October?4 November 2003. It was found that within a prestorm period in the dayside ionosphere at altitudes of ~600 km the ion density increased up to ~80% in response to flare-associated enhancements of the solar X-ray emission. Ionospheric response to the SEP events was revealed both at sunlit and nightside hemispheres, where the ion density increased up to ~40% and 100%, respectively. We did not find any prominent response of the ion temperature to the X-ray and SEP enhancements. The largest X-ray and SEP impacts were found for the X17 solar flare on 28 October 2003, which was characterized by the most intense fluxes of solar EUV (Tsurutani et al., 2005) and relativistic solar particles (Veselovsky et al., 2004). Solar events on 14 July 2000 and 29 October 2003 demonstrate weaker impacts with respect to their X-ray and SEP intensities. The weakest ionospheric response is observed for the limb X28 solar flare on 4 November 2003. The topside ionosphere response to the extreme solar events is interpreted in terms of the short-duration impact of the solar electromagnetic radiation and the long-lasting impact of the SEP
ΠΠ ΠΠΠΠΠΠΠ¦ΠΠΠΠΠ-ΠΠΠΠΠΠΠΠ§ΠΠ‘ΠΠΠ ΠΠ‘ΠΠΠΠΠΠΠ‘Π’Π Π ΠΠΠΠΠ’ΠΠ― Π Π€Π£ΠΠΠ¦ΠΠΠΠΠ ΠΠΠΠΠΠ― ΠΠΠΠΠΠ ΠΠΠΠΠΠΠ¦ΠΠΠΠΠΠΠ ΠΠ ΠΠΠΠ ΠΠΠΠΠΠ’ΠΠΠ¬Π‘Π’ΠΠ
The article examines problems of development and functioning of small innovation entrepreneurship in Russia, discusses their advantages and disadvantages. Statistical indicators of development of innovations in recent years in the context of the report "Global innovation index". The authors off er interventions aimed at the expansion of reproduction of high technologies for the further development of innovation in the Russian Federation. Critically considers the opinions of various experts in forecasting the development of macroeconomic situation in Russia. Conclusions about the necessity of the innovation process in the economy.Purposes / tasks. The aim of the article is elaboration of measures aimed at enhancing the reproduction of high technology for processes of development and implementation of innovations in the field of engineering, technology, Economics, organization and management.Tasks of the article: to analyze and isolate problems pertaining to:β’ the state of innovation activities in Russia;β’ a weak small innovative enterprises;β’ state stimulation of small innovative enterprises;β’ increase the pace of development of small business in innovative sphere of the country.Methodology. In conducting this research the main sources of baseline data were the materials of state statistics, data from Rosstat and excerpts from Government programs. The basis of methodological developments based on a descriptive, comparative method and morphological analysis. They are allowed to perform all of the necessary information and to draw conclusions on this work.Results. This broad concept to small innovative entrepreneurship, analysed its current status in Russia, given his brief analysis of the advantages and disadvantages. Shown low efficiency of functioning and development of small enterprises in General. Analyzes the dynamics of the positions of the Russian Federation the report "Global innovation index": 2014β2016, as well as Russian and foreign experts forecast the development of the innovative aspect of the Russian economy. The proposed measures aimed at the eff ective development of small innovative entrepreneurship.Conclusions / importance. Small innovative businesses in Russia will be able to successfully and quickly evolve only in the case of a deliberate and consistent policy of public authorities and with the active support of business and public organizations in the country.Π Π΄Π°Π½Π½ΠΎΠΉ ΡΡΠ°ΡΡΠ΅ ΠΈΡΡΠ»Π΅Π΄ΡΡΡΡΡ ΠΏΡΠΎΠ±Π»Π΅ΠΌΡ ΡΠ°Π·Π²ΠΈΡΠΈΡ ΠΈ ΡΡΠ½ΠΊΡΠΈΠΎΠ½ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΌΠ°Π»ΠΎΠ³ΠΎ ΠΈΠ½Π½ΠΎΠ²Π°ΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΏΡΠ΅Π΄ΠΏΡΠΈΠ½ΠΈΠΌΠ°ΡΠ΅Π»ΡΡΡΠ²Π° Π² Π ΠΎΡΡΠΈΠΉΡΠΊΠΎΠΉ Π€Π΅Π΄Π΅ΡΠ°ΡΠΈΠΈ, ΡΠ°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°ΡΡΡΡ ΠΈΡ
Π΄ΠΎΡΡΠΎΠΈΠ½ΡΡΠ²Π° ΠΈ Π½Π΅Π΄ΠΎΡΡΠ°ΡΠΊΠΈ. ΠΠ½Π°Π»ΠΈΠ·ΠΈΡΡΡΡΡΡ ΡΡΠ°ΡΠΈΡΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΏΠΎΠΊΠ°Π·Π°ΡΠ΅Π»ΠΈ ΡΠ°Π·Π²ΠΈΡΠΈΡ ΠΈΠ½Π½ΠΎΠ²Π°ΡΠΈΠΉ Π·Π° ΠΏΠΎΡΠ»Π΅Π΄Π½ΠΈΠ΅ Π³ΠΎΠ΄Ρ Π² ΠΊΠΎΠ½ΡΠ΅ΠΊΡΡΠ΅ Π΄ΠΎΠΊΠ»Π°Π΄Π° Β«ΠΠ»ΠΎΠ±Π°Π»ΡΠ½ΡΠΉ ΠΈΠ½Π½ΠΎΠ²Π°ΡΠΈΠΎΠ½Π½ΡΠΉ ΠΈΠ½Π΄Π΅ΠΊΡΒ». ΠΠ²ΡΠΎΡΠ°ΠΌΠΈ ΠΏΡΠ΅Π΄Π»Π°Π³Π°ΡΡΡΡ ΠΌΠ΅ΡΠΎΠΏΡΠΈΡΡΠΈΡ, Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½Π½ΡΠ΅ Π½Π° ΡΠ°ΡΡΠΈΡΠ΅Π½ΠΈΡ Π²ΠΎΡΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²Π° Π½Π°ΡΠΊΠΎΡΠΌΠΊΠΈΡ
ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΠΉ Π΄Π»Ρ Π΄Π°Π»ΡΠ½Π΅ΠΉΡΠ΅Π³ΠΎ ΡΠ°Π·Π²ΠΈΡΠΈΡ ΠΈΠ½Π½ΠΎΠ²Π°ΡΠΈΠΉ Π² Π ΠΎΡΡΠΈΠΉΡΠΊΠΎΠΉ Π€Π΅Π΄Π΅ΡΠ°ΡΠΈΠΈ. ΠΡΠΈΡΠΈΡΠ΅ΡΠΊΠΈ ΡΠ°ΡΡΠΌΠΎΡΡΠ΅Π½Ρ ΠΌΠ½Π΅Π½ΠΈΡ ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΡΠΊΡΠΏΠ΅ΡΡΠΎΠ² ΠΏΠΎ ΠΏΡΠΎΠ³Π½ΠΎΠ·ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠ°Π·Π²ΠΈΡΠΈΡ ΠΌΠ°ΠΊΡΠΎΡΠΊΠΎΠ½ΠΎΠΌΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠΈΡΡΠ°ΡΠΈΠΈ Π² Π ΠΎΡΡΠΈΠΈ. Π‘Π΄Π΅Π»Π°Π½Ρ Π²ΡΠ²ΠΎΠ΄Ρ ΠΎ Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎΡΡΠΈ ΠΈΠ½Π½ΠΎΠ²Π°ΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΏΡΠΎΡΠ΅ΡΡΠ° Π² ΡΠΊΠΎΠ½ΠΎΠΌΠΈΠΊΠ΅.Π¦Π΅Π»Ρ / Π·Π°Π΄Π°ΡΠΈ. Π¦Π΅Π»ΡΡ ΡΡΠ°ΡΡΠΈ ΡΠ²Π»ΡΠ΅ΡΡΡ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠ° ΠΌΠ΅ΡΠΎΠΏΡΠΈΡΡΠΈΠΉ, Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½Π½ΡΡ
Π½Π° ΡΠ°ΡΡΠΈΡΠ΅Π½ΠΈΠ΅ Π²ΠΎΡΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²Π° Π½Π°ΡΠΊΠΎΡΠΌΠΊΠΈΡ
ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΠΉ Π΄Π»Ρ ΠΏΡΠΎΡΠ΅ΡΡΠΎΠ² ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠΈ ΠΈ Π²Π½Π΅Π΄ΡΠ΅Π½ΠΈΡ Π½ΠΎΠ²ΠΎΠ²Π²Π΅Π΄Π΅Π½ΠΈΠΉ Π² ΠΎΠ±Π»Π°ΡΡΠΈ ΡΠ΅Ρ
Π½ΠΈΠΊΠΈ, ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΠΈ, ΡΠΊΠΎΠ½ΠΎΠΌΠΈΠΊΠΈ, ΠΎΡΠ³Π°Π½ΠΈΠ·Π°ΡΠΈΠΈ ΠΈ ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ. ΠΠ°Π΄Π°ΡΠΈ ΡΡΠ°ΡΡΠΈ: ΠΏΡΠΎΠ°Π½Π°Π»ΠΈΠ·ΠΈΡΠΎΠ²Π°ΡΡ ΠΈ Π²ΡΠ΄Π΅Π»ΠΈΡΡ ΠΏΡΠΎΠ±Π»Π΅ΠΌΡ, ΠΊΠ°ΡΠ°ΡΡΠΈΠ΅ΡΡ: ΡΠΎΡΡΠΎΡΠ½ΠΈΡ ΠΈΠ½Π½ΠΎΠ²Π°ΡΠΈΠΎΠ½Π½ΠΎΠΉ Π΄Π΅ΡΡΠ΅Π»ΡΠ½ΠΎΡΡΠΈ Π² Π ΠΎΡΡΠΈΠΈ; ΡΠ»Π°Π±ΠΎ Π²ΡΡΠ°ΠΆΠ΅Π½Π½ΠΎΠ³ΠΎ ΠΌΠ°Π»ΠΎΠ³ΠΎ ΠΈΠ½Π½ΠΎΠ²Π°ΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΏΡΠ΅Π΄ΠΏΡΠΈΠ½ΠΈΠΌΠ°ΡΠ΅Π»ΡΡΡΠ²Π°; Π³ΠΎΡΡΠ΄Π°ΡΡΡΠ²Π΅Π½Π½ΠΎΠ³ΠΎ ΡΡΠΈΠΌΡΠ»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΌΠ°Π»ΡΡ
ΠΈΠ½Π½ΠΎΠ²Π°ΡΠΈΠΎΠ½Π½ΡΡ
ΠΏΡΠ΅Π΄ΠΏΡΠΈΡΡΠΈΠΉ; ΠΏΠΎΠ²ΡΡΠ΅Π½ΠΈΡ ΡΠ΅ΠΌΠΏΠΎΠ² ΡΠ°Π·Π²ΠΈΡΠΈΡ ΠΌΠ°Π»ΠΎΠ³ΠΎ ΠΏΡΠ΅Π΄ΠΏΡΠΈΠ½ΠΈΠΌΠ°ΡΠ΅Π»ΡΡΡΠ²Π° Π² ΠΈΠ½Π½ΠΎΠ²Π°ΡΠΈΠΎΠ½Π½ΠΎΠΉ ΡΡΠ΅ΡΠ΅ ΡΡΡΠ°Π½Ρ.ΠΠ΅ΡΠΎΠ΄ΠΎΠ»ΠΎΠ³ΠΈΡ. ΠΡΠΈ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΈΠΈ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΎΡΠ½ΠΎΠ²Π½ΡΠΌΠΈ ΠΈΡΡΠΎΡΠ½ΠΈΠΊΠ°ΠΌΠΈ ΠΈΡΡ
ΠΎΠ΄Π½ΡΡ
Π΄Π°Π½Π½ΡΡ
ΠΏΠΎΡΠ»ΡΠΆΠΈΠ»ΠΈ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Ρ Π³ΠΎΡΡΠ΄Π°ΡΡΡΠ²Π΅Π½Π½ΠΎΠΉ ΡΡΠ°ΡΠΈΡΡΠΈΠΊΠΈ, Π΄Π°Π½Π½ΡΠ΅ ΠΈΠ· Π ΠΎΡΡΡΠ°ΡΠ° ΠΈ Π²ΡΠ΄Π΅ΡΠΆΠΊΠΈ ΠΈΠ· ΠΠΎΡΡΠ΄Π°ΡΡΡΠ²Π΅Π½Π½ΡΡ
ΠΏΡΠΎΠ³ΡΠ°ΠΌΠΌ. Π ΠΎΡΠ½ΠΎΠ²Ρ ΠΌΠ΅ΡΠΎΠ΄ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΎΠΊ ΠΏΠΎΠ»ΠΎΠΆΠ΅Π½Ρ ΠΎΠΏΠΈΡΠ°ΡΠ΅Π»ΡΠ½ΡΠΉ, ΡΡΠ°Π²Π½ΠΈΡΠ΅Π»ΡΠ½ΠΎ-ΡΠΎΠΏΠΎΡΡΠ°Π²ΠΈΡΠ΅Π»ΡΠ½ΡΠΉ ΠΌΠ΅ΡΠΎΠ΄ ΠΈ ΠΌΠ΅ΡΠΎΠ΄ ΠΌΠΎΡΡΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π°Π½Π°Π»ΠΈΠ·Π°. ΠΠ½ΠΈ ΠΏΠΎΠ·Π²ΠΎΠ»ΠΈΠ»ΠΈ ΠΏΡΠΎΠ°Π½Π°Π»ΠΈΠ·ΠΈΡΠΎΠ²Π°ΡΡ Π²ΡΡ Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΡΡ ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΡ ΠΈ ΡΠ΄Π΅Π»Π°ΡΡ Π²ΡΠ²ΠΎΠ΄Ρ ΠΏΠΎ Π΄Π°Π½Π½ΠΎΠΉ ΡΠ°Π±ΠΎΡΠ΅.Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ. ΠΠ°Π½ΠΎ ΡΠΈΡΠΎΠΊΠΎΠ΅ ΠΏΠΎΠ½ΡΡΠΈΠ΅ ΠΌΠ°Π»ΠΎΠΌΡ ΠΈΠ½Π½ΠΎΠ²Π°ΡΠΈΠΎΠ½Π½ΠΎΠΌΡ ΠΏΡΠ΅Π΄ΠΏΡΠΈΠ½ΠΈΠΌΠ°ΡΠ΅Π»ΡΡΡΠ²Ρ, ΠΏΡΠΎΠ°Π½Π°Π»ΠΈΠ·ΠΈΡΠΎΠ²Π°Π½ΠΎ Π΅Π³ΠΎ ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠ΅ ΡΠΎΡΡΠΎΡΠ½ΠΈΠ΅ Π² Π ΠΎΡΡΠΈΠΈ, ΠΏΡΠΈΠ²Π΅Π΄Π΅Π½ Π΅Π³ΠΎ ΠΊΡΠ°ΡΠΊΠΈΠΉ Π°Π½Π°Π»ΠΈΠ· ΠΏΡΠ΅ΠΈΠΌΡΡΠ΅ΡΡΠ² ΠΈ Π½Π΅Π΄ΠΎΡΡΠ°ΡΠΊΠΎΠ². ΠΠΎΠΊΠ°Π·Π°Π½Π° Π½ΠΈΠ·ΠΊΠ°Ρ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΡΡΠ½ΠΊΡΠΈΠΎΠ½ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΈ ΡΠ°Π·Π²ΠΈΡΠΈΡ ΠΌΠ°Π»ΡΡ
ΠΏΡΠ΅Π΄ΠΏΡΠΈΡΡΠΈΠΉ Π² ΡΠ΅Π»ΠΎΠΌ. ΠΡΠΎΠ°Π½Π°Π»ΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π° Π΄ΠΈΠ½Π°ΠΌΠΈΠΊΠ° ΠΏΠΎΠ·ΠΈΡΠΈΠΉ Π ΠΎΡΡΠΈΠΉΡΠΊΠΎΠΉ Π€Π΅Π΄Π΅ΡΠ°ΡΠΈΠΈ Π² Π΄ΠΎΠΊΠ»Π°Π΄Π΅ Β«ΠΠ»ΠΎΠ±Π°Π»ΡΠ½ΡΠΉ ΠΈΠ½Π½ΠΎΠ²Π°ΡΠΈΠΎΠ½Π½ΡΠΉ ΠΈΠ½Π΄Π΅ΠΊΡΒ»: 2014β2016 Π³ΠΎΠ΄ΠΎΠ², Π° ΡΠ°ΠΊΠΆΠ΅ ΠΌΠ½Π΅Π½ΠΈΡ ΠΎΡΠ΅ΡΠ΅ΡΡΠ²Π΅Π½Π½ΡΡ
ΠΈ Π·Π°ΡΡΠ±Π΅ΠΆΠ½ΡΡ
ΡΠΊΡΠΏΠ΅ΡΡΠΎΠ² ΠΏΠΎ ΠΏΡΠΎΠ³Π½ΠΎΠ·Ρ ΡΠ°Π·Π²ΠΈΡΠΈΡ ΠΈΠ½Π½ΠΎΠ²Π°ΡΠΈ- ΠΎΠ½Π½ΠΎΠ³ΠΎ Π°ΡΠΏΠ΅ΠΊΡΠ° ΡΠΊΠΎΠ½ΠΎΠΌΠΈΠΊΠΈ Π ΠΎΡΡΠΈΠΈ. ΠΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½Ρ ΠΌΠ΅ΡΡ, Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½Π½ΡΠ΅ Π½Π° ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΠ΅ ΡΠ°Π·Π²ΠΈΡΠΈΠ΅ ΠΌΠ°Π»ΠΎΠ³ΠΎ ΠΈΠ½Π½ΠΎΠ²Π°ΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΏΡΠ΅Π΄ΠΏΡΠΈΠ½ΠΈΠΌΠ°ΡΠ΅Π»ΡΡΡΠ²Π°.ΠΡΠ²ΠΎΠ΄Ρ / Π·Π½Π°ΡΠΈΠΌΠΎΡΡΡ. ΠΠ°Π»ΠΎΠ΅ ΠΈΠ½Π½ΠΎΠ²Π°ΡΠΈΠΎΠ½Π½ΠΎΠ΅ ΠΏΡΠ΅Π΄ΠΏΡΠΈΠ½ΠΈΠΌΠ°ΡΠ΅Π»ΡΡΡΠ²ΠΎ Π² Π Π€ ΠΌΠΎΠΆΠ΅Ρ ΡΠ°Π·Π²ΠΈΠ²Π°ΡΡΡΡ ΠΈ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎ ΡΡΠ½ΠΊΡΠΈΠΎΠ½ΠΈΡΠΎΠ²Π°ΡΡ ΡΠΎΠ»ΡΠΊΠΎ ΠΏΡΠΈ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΈΠΈ ΡΠ΅Π»Π΅Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½Π½ΠΎΠΉ ΠΈ ΠΏΠΎΡΠ»Π΅Π΄ΠΎΠ²Π°ΡΠ΅Π»ΡΠ½ΠΎΠΉ ΠΏΠΎΠ»ΠΈΡΠΈΠΊΠΈ Π½Π°ΡΠ΅Π³ΠΎ Π³ΠΎΡΡΠ΄Π°ΡΡΡΠ²Π°, Π° ΡΠ°ΠΊΠΆΠ΅ ΠΏΡΠΈ Π³ΠΎΡΡΠ΄Π°ΡΡΡΠ²Π΅Π½Π½ΠΎΠΉ ΠΏΠΎΠ΄Π΄Π΅ΡΠΆΠΊΠ΅ ΠΏΡΠ΅Π΄ΠΏΡΠΈΠ½ΠΈΠΌΠ°ΡΠ΅Π»ΡΡΡΠ²Π° ΠΈ ΠΎΠ±ΡΠ΅ΡΡΠ²Π΅Π½Π½ΡΡ
ΠΎΡΠ³Π°Π½ΠΈΠ·Π°ΡΠΈΠΉ
Hysteresis of the Contact Angle of a Meniscus Inside a Capillary with Smooth, Homogeneous Solid Walls
This paper was accepted for publication in the journal Langmuir: the ACS journal of surfaces and colloids and the definitive published version is available at http://dx.doi.org/10.1021/acs.langmuir.6b00721.A theory of contact angle hysteresis of a
meniscus inside thin capillaries with smooth, homogeneous solid walls is developed in terms of surface forces (disjoining/
conjoining pressure isotherm) using a quasi-equilibrium approach. The disjoining
/conjoining pressure isotherm includes electrostatic, intermolecular, and structural components. The values of the static receding ΞΈr, advancing ΞΈa , and
equilibrium ΞΈe contact angles in thin capillaries were calculated on the basis of the shape of the disjoining/conjoining pressure isotherm. It was shown that both advancing and receding contact angles depend on the capillary radius. The suggested
mechanism of the contact angle hysteresis has a direct experimental confirmation: the process of receding is accompanied by the formation of thick Ξ²-films on the capillary walls. The effect of the transition from partial to complete wetting in thin capillaries is predicted and analyzed. This effect takes place in very thin capillaries, when the receding contact angle decreases to zero
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