293 research outputs found
The role of collective motion in examples of coarsening and self-assembly
No full textThe simplest prescription for building a patterned structure from its constituents is to add particles, one at a time, to an appropriate template. However, self-organizing molecular and colloidal systems in nature can evolve in much more hierarchical ways. Specifically, constituents (or clusters of constituents) may aggregate to form clusters (or clusters of clusters) that serve as building blocks for later stages of assembly. Here we evaluate the character and consequences of such collective motion in a set of prototypical assembly processes. We do so using computer simulations in which a system's capacity for hierarchical dynamics can be controlled systematically. By explicitly allowing or suppressing collective motion, we quantify its effects. We find that coarsening within a two dimensional attractive lattice gas (and an analogous off-lattice model in three dimensions) is naturally dominated by collective motion over a broad range of temperatures and densities. Under such circumstances, cluster mobility inhibits the development of uniform coexisting phases, especially when macroscopic segregation is strongly favored by thermodynamics. By contrast, the assembly of model viral capsids is not frustrated but is instead facilitated by collective moves, which promote the orderly binding of intermediates consisting of several monomers
Les premières industries à pointes foliacées en Europe centrale
No full textIn Eastern Europe, the earliest foliate points recognized date to the Mindel. Their presence is attested in Germany (Ehnngsdorf, Reutersruh, Salzgitter-Lebenstedt and Wannen) and in the Ukraine (Korolevo). On the whole, these pieces are few in number. Contrary to this, foliate points have been recovered in large numbers in the different levels at Korolevo, belonging to the transition from the Acheulean to Mousterian.En Europe de l'Est, les plus anciennes pointes foliacées connues sont datées de l'inter-Mindel Leur présence est attestée en Allemagne : sites d'Ehnngsdorf, de Reutersruh, de Salzgitter-Lebenstedt et de Wannen, et en Ukraine ¦ site de Korolevo. De façon générale, ces pièces sont peu nombreuses. A Korolevo, cependant, des pointes foliacées furent retrouvées en plus grand nombre dans les différents niveaux de transition entre l'Acheuléen et le Moustérien.Nikolaevitch Gladilin Vladislav, I. Slitlvyj Valéry, I. Tkachenko Victor. Les premières industries à pointes foliacées en Europe centrale. In: Paléo. Supplément,1995. pp. 111-116
Левко Боровиковський як провісник романтичної елегії-думки
No full textIn the article “Levko Borovykovsky as a Prophet of Romantic Elegy-Dumka” by Olena Tkachenko, the author traces back the birth and development of such genre as elegy-dumka in Ukrainian romantic poetry on the basis of the most wide-known poems by the writer.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/141
Higher education development in independent Ukraine (1991-2002)
No full textTkachenko Uliana. Higher education development in independent Ukraine (1991-2002). Journal of Education, Health and Sport. 2019;9(6):562-571. eISSN 2391-8306. DOI http://dx.doi.org/10.5281/zenodo.3661433
http://ojs.ukw.edu.pl/index.php/johs/article/view/7684
The journal has had 7 points in Ministry of Science and Higher Education parametric evaluation. Part B item 1223 (26/01/2017).
1223 Journal of Education, Health and Sport eISSN 2391-8306 7
© The Authors 2019;
This article is published with open access at Licensee Open Journal Systems of Kazimierz Wielki University in Bydgoszcz, Poland
Open Access. This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author (s) and source are credited. This is an open access article licensed under the terms of the Creative Commons Attribution Non commercial license Share alike.
(http://creativecommons.org/licenses/by-nc-sa/4.0/) which permits unrestricted, non commercial use, distribution and reproduction in any medium, provided the work is properly cited.
The authors declare that there is no conflict of interests regarding the publication of this paper.
Received: 10.06.2019. Revised: 24.06.2019. Accepted: 28.06.2019.
УДК: 378.091-043.86(477)"1991/2002"(09)
HIGHER EDUCATION DEVELOPMENT IN INDEPENDENT UKRAINE (1991-2002)
Uliana Tkachenko
Khmelnytskyi Humanitarian-Pedagogical Academy
[email protected]
Abstract
The article deals with the problem of higher education development in independent Ukraine in the period 1991-2002. The main ways of reforming the education system are outlined. The priorities of the state policy in the development of education are revealed. Areas of international cooperation in the field of education and science are of great importance.
Key words: education; development of higher education; reform; directions
Thermal - Vacuum dehydration and dispergation of dispersed materials
No full text[EN] Scientific and technical studies on the intensification of removal moisture from dispersed materials and their simultaneous dispergation in the hollow heating element of a thermo-vacuum apparatus is researched. Continuous thermo-vacuum dehydration and dispergation process of zirconium hydroxide, brown coal, graphite, sawdust, biological materials is considered. Based on conducted studies was made conclusions about perspective to use this technology. Thermo-vacuum technology is different from the other by low-temperature heating, low time processing, humidity indicators controlling and nano-dispersion grinding.Kutovyi, V.; Tkachenko, V.; Nikolaenko, A. (2018). Thermal - Vacuum dehydration and dispergation of dispersed materials. En IDS 2018. 21st International Drying Symposium Proceedings. Editorial Universitat Politècnica de València. 1831-1838. https://doi.org/10.4995/IDS2018.2018.7798OCS1831183
Static properties of a warm dense uniform electron gas
No full textCopyright 2021 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in J. Ara, Ll. Coloma, and I. M. Tkachenko , "Static properties of a warm dense uniform electron gas", Physics of Plasmas 28, 112704 (2021) https://doi.org/10.1063/5.0062259[EN] We show how the static dielectric function and other static characteristics of dense warm charged Fermi liquids can be obtained exclusively from the system static structure factor. The non-perturbative self-consistent method of moments is employed to extend onto quantum fluids, a similar reduction stemming from the fluctuation-dissipation theorem and other exact relations for classical one-component plasmas. The results are compared to and complement the numerical data obtained recently by the path-integral Monte Carlo method. Alternative theoretical approaches are discussed and employed as well.I.M.T. is grateful to M. Bonitz and T. Dornheim for several valuable discussions. The authors appreciate that M. Bonitz and T. Dornheim provided accurate path integral Monte Carlo simulation results. I.M.T. also acknowledges fruitful discussions with Yu. V. Arkhipov and L. Conde and the financial support provided by the Committee of Science of the Ministry of Education and Science of the Republic of Kazakhstan (Project No. AP09260349).Ara-Bernad, J.; Coloma, L.; Tkachenko Gorski, IM. (2021). Static properties of a warm dense uniform electron gas. Physics of Plasmas. 28(11):1-17. https://doi.org/10.1063/5.0062259S117281
Creative activity of historian, local researcher, etnographer, dissident Borys Tkachenko: problems of the past and present
No full textДемиденко, Н. Творча спадщина історика, краєзнавця, етнографа, дисидента Бориса Ткаченка: проблеми минувшини і сьогодення [Електронний ресурс] / Демиденко Надія // Історія науки і біографістика. - 2022. - № 4. - С. 120-138. - Режим доступу: http://nbuv.gov.ua/UJRN/INB_Title_2022_4_13.Висвітлено діяльність історика, етнографа, культурно-громадського діяча Бориса Івановича Ткаченка, автора 11 книг – оригінальних досліджень з найрезонансніших і найболючіших тем української історії. Констатовано, що перші праці автора – агронома й історика за фахом – присвячені передовим методам господарювання на землі, включаючи екологічні фактори як головні для збереження земельних ресурсів. Акцентовано на вагомих результатах науково-дослідницької роботи Б. Ткаченка про репресії радянської влади в Україні у 30-х рр. ХХ ст. Проаналізовано його книгу «Під чорним тавром», яка стала першою, виданою в Україні, що розкривала злочини Голодомору 1932-1933 рр. як на основі архівних джерел, так і спогадів очевидців. Відзначено вагомий внесок Б. Ткаченка у розвиток краєзнавства та фольклористики. Науковцю вдалося дослідити факти, що стосуються життя і побуду окремих територій України, починаючи від часів її заселення, відтак збагатити збіднене уявлення про явища і події вітчизняної історії.The article highlights the activities of historian, ethnographer, cultural and social activist Borys Ivanovych Tkachenko (born in 1937), the author of 11 books – original studies on the most resonant and painful topics of Ukrainian history. It was established that the author, who is an agronomist and historian by profession, devoted his first works to problematic issues of land management, including ecological factors as the main ones for preserving land resources. Attention is focused on the significant results of B. Tkachenko's research work on the repression of the Soviet authorities in Ukraine in the 1930s of the XX century. In particular, the author's book "Under the Black Brand" was analyzed, which became the first book published in Ukraine that revealed the crimes of the Holodomor in 1932-1933, both on the basis of archival sources and the memories of eyewitnesses. It is noted about B. Tkachenko's significant contribution to the development of local history, in particular his works, which highlight the history of individual territories of Ukraine, starting from the time of their settlement. The researcher managed to research and record facts and documents related to the life and development of a particular area, thereby enriching the impoverished idea of certain phenomena and events of our general history. After all, the general is revealed in the individual, and the individual exists in the general. The scientific work of the researcher as a folklorist in the collection and popularization of folk songs of the region was noted. When writing the article, general historical (comparative-historical, retrospective) methods and the method of source analysis were used.Исследована деятельность историка, этнографа, культурно-общественного деятеля Бориса Ивановича Ткаченко, автора 11 книг – оригинальных исследований по самым резонансным и болезненным темам украинской истории. Констатировано, что первые труды автора – агронома и историка по специальности – посвящены передовым методам хозяйствования на земле, включая экологические факторы как главные для сохранения земельных ресурсов. Акцентировано на весомых результатах научно-исследовательской работы Б. Ткаченко о репрессиях советской власти в Украине в 30-х гг. ХХ ст. Проанализирована его книга «Под черным клеймом», которая стала первой, изданной в Украине, раскрывавшей преступления Голодомора 1932-1933 гг. как на основе архивных источников, так и воспоминаний очевидцев. Отмечен весомый вклад Б. Ткаченко в развитие краеведения и фольклористики. Ученому удалось исследовать факты, касающиеся жизни и построения отдельных территорий Украины, начиная со времен ее заселения, обогатить обедненное представление о явлениях и событиях отечественной истории
DEVELOPMENT OF LAWS ON THE STATE YOUTH POLICY IN THE SECOND HALF OF THE 1980th – THE 2010th YEARS: MAIN RESULTS AND VALUE
No full textReforming of social and economic development of the country in the second half of the 1980th years has caused the necessity of increase in a role of the younger generation in the solution of economic, welfare tasks, management of the public and public affairs. The youth policy is made out in an independent field of activity of the state. The regulatory legal base of the sphere of youth policy is formed.
Purpose. To analyse process of development and adoption of laws on the state youth policy during the studied period, to define their value in development of the sphere of youth policy.
Methodology. The author uses historical, comparative-historical, problem and chronological and comparative and legal methods.
Results. The author has shown a role of Komsomol in the conditions of the happening social and economic transformations in the country in the solution of the question of development and adoption of law on youth which has become the starting document in development of the state youth policy in the USSR and the Russian Federation. Process of development and adoption of laws on youth policy in the Russian Federation is considered. The problems which have influenced legislative activity during the studied period are revealed.
Practical implications. Results of a research can be used by pedagogical and scientific and pedagogical workers, public servants in the sphere of youth policy when developing the normative and methodical documents regulating this sphere
Vliv parametrů přechodové oblasti na procesy na magnetopauze
No full textNázev práce: Vliv parametrů přechodové oblasti na procesy na magnetopauze Autor: Oksana Tkachenko Katedra: Katedra fyziky povrchů a plazmatu Vedoucí disertační práce: Prof. RNDr. Jana Šafránková, DrSc. e-mail address: [email protected] Abstrakt: Předkládaná dizertační práce je zaměřena na dvě oblasti, jež jsou důležité pro interakci slunečního větru s zemskou magnetosférou: kasp ve vysokých geomagnetických šířkách a subsolární magnetopauza v nízkých šířkách. Průnik slunečního plazmatu do zemské magnetosféry může probíhat podél kaspů. Oblast přilehlá k magnetopauze v blízkosti kaspu je velmi turbu- lentní, vyplněná horkým plazmatem z přechodové oblasti s nízkou driftovou rychlostí. V první části dizertační práce se proto věnujeme detailnímu rozboru vírové struktury ve vhloubení magnetopauzy nad kaspem za použití dat družic Interball-1 a Magion-4. Popsali jsme nezbytné podmínky a možný mechanismus vzniku této struktury. Druhá část práce se týká for- mování a prostorové struktuře hraniční vrstvy nízkých šířek (Low-latitude Boundary Layer, dále LLBL) a jejím časovým změnám. Ačkoliv LLBL hraje klíčovou roli v přenosu hmoty, hybnosti a energie ze slunečního větru do magnetosféry,...Title: Role of magnetosheath parameters on magnetopause processes Author: Oksana Tkachenko Department: Department of Surface and Plasma Science Supervisor: Prof. RNDr. Jana Šafránková, DrSc. e-mail address: [email protected] Abstract: The thesis addresses of two regions significant for the solar wind- magnetosphere coupling: the cusp in high geomagnetic latitudes and the low-latitude (LLBL) subsolar magnetopause. A penetration of plasma of a solar origin into the magnetosphere could be realized directly through magnetospheric cusps. The region adjacent to the magnetopause in the cusp vicinity is highly turbulent, occupied by the heated magnetosheath- -like plasma with a low drift velocity for which occurrence of vortices is a very common feature. In the first part of the thesis, we present a de- tailed analysis of a vortex-like structure created by a turbulent plasma flow around the magnetopause indentation above the cusp and using the data from Interball-1 and Magion-4; we find necessary conditions and a possible mechanisms to creation of such structures. The second part concerns the low-latitude boundary layer formation, its spatial structure and temporal changes based on THEMIS multipoint observations. In spite of its cru- cial role in transfer of mass, momentum, and energy from the...Katedra fyziky povrchů a plazmatuDepartment of Surface and Plasma ScienceMatematicko-fyzikální fakultaFaculty of Mathematics and Physic
Use of the over-the-scope-clip (OTSC) in non-variceal upper gastrointestinal bleeding in patients with severe cardiovascular comorbidities: a retrospective study
No full textAbstract
Introduction The over-the-scope-clip (OTSC) can potentially overcome
limitations of standard clips and achieve more efficient and reliable
hemostasis. Data on OTSC use for non-variceal upper gastrointestinal bleeding
(NVUGIB) in patients with cardiovascular comorbidities are currently limited.
Patients and methods We prospectively collected and retrospectively
analyzed our database from February 2009 to September 2015 from all patients who
underwent emergency endoscopy for high-risk NVUGIB in 2 academic centers and
were treated with OTSC as first-line (n = 81) or second-line therapy (n = 19).
Results One hundred patients mean age 72 (range 27 – 97 years) were
included in this study. Fifty-one percent (n = 51) had severe cardiovascular
co-morbidity (ischemic heart disease, congestive heart failure, hypertension,
valvular heart disease, peripheral arterial occlusive disease and atrial
fibrillation) and 73 % (n = 73) were on antiplatelet or/and anticoagulation
therapy. The median size of the treated ulcers was 3 cm (range 1 – 5 cm). In
94 % (n = 94) primary hemostasis with OTSC was achieved. Clinical long-term
success during a mean 6-month follow-up without rebleeding was 86 % (n = 86).
Conclusions In this cohort OTSC was demonstrated to be a safe and
effective first- or second-line treatment for NVUGIB in high-risk patients with
cardiovascular disease and complex, large ulcers. Meeting presentations:
Annual Meeting of the German Society of Endoscopy (DEGBV) in Mannheim, Germany,
March 17th–19th, 2016 and DDW 2016 in San Diego, United
States</jats:p
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