Precision Quantum Hall Resistance Measurement on Epitaxial Graphene Device in Low Magnetic Field

Precision quantum Hall resistance (QHR) measurements were performed on large-area epitaxial graphene device at low magnetic fields (B = 2 T - 8 T) at temperature T = 1.5 K. Hall resistance was measured using Cryogenic Current Comparator resistance bridge with high biasing current Isd = 40 micro ampere. The results showed that at B = 8 T the relative deviation of Hall resistance from the expected quantized value h/2e2 is within experimental uncertainty of 3.5 parts in 108 and remained below 0.35 parts per million (ppm) down to B = 3 T

Transformation of amorphous carbon clusters to fullerenes

Transformation of amorphous carbon clusters into fullerenes under high temperature is studied using molecular dynamics simulations at microsecond times. Based on the analysis of both structure and energy of the system, it is found that fullerene formation occurs in two stages. Firstly, fast transformation of the initial amorphous structure into a hollow sp$^2$ shell with a few chains attached occurs with a considerable decrease of the potential energy and the number of atoms belonging to chains and to the amorphous domain. Then, insertion of remaining carbon chains into the sp$^2$ network takes place at the same time with the fullerene shell formation. Two types of defects remaining after the formation of the fullerene shell are revealed: 7-membered rings and single one-coordinated atoms. One of the fullerene structures obtained contains no defects at all, which demonstrates that defect-free carbon cages can be occasionally formed from amorphous precursors directly without defect healing. No structural changes are observed after the fullerene formation, suggesting that defect healing is a slow process in comparison with the fullerene shell formation. The schemes of the revealed reactions of chain atoms insertion into the fullerene shell just before its completion are presented. The results of the performed simulations are summarized within the paradigm of fullerene formation due to selforganization of the carbon system.Comment: 35 pages, 9 figure

Role of Toll-like receptors in development of postpartum endometritis

The aim of the study was to establish the association between expression of TLR1 (ligands - triacyl lipopeptides), TLR2 (ligands - lipopeptides, lipoteichoic acid, zymosan), and TLR 5 (ligand - flagellin) of cervical epithelial cells in vivo and development of postpartum endometritis in women with high infection riskyesBelgorod State Universit

The Role of Teachers in School Magazines: Critics, Authors, Readers

The number of school periodicals continues to grow. They can be attributed to the media or amateur media education projects, but almost always their preparation and production is supervised by teachers of primary or secondary schools. Teachers are also the authors, heroes and attentive readers of the texts published in school periodicals. The article discusses the influence of teachers who do not have media education on creating a meaningful model of school newspapers.Количество школьных изданий продолжает расти. Их можно отнести к самодеятельной прессе или медиаобразовательным проектам, но практически всегда их подготовку и выпуск курируют педагоги основного или дополнительного образования. Учителя являются также авторами некоторых публикаций, их героями и, конечно, внимательными читателями. В статье рассматривается влияние учителей, не являющихся медиапедагогами, на содержательную модель школьных изданий и на их развитие в целом

Legal dualism of local government in Russia

The article justifies the statement about the legal dualism of local government in modern Russia

School edition: the problem of conformity needs of the audience

The article presents the results of research of thematic preferences of adolescents regarding the substantive content of school editions. The author also presents the analysis of the reasons that do not allow the school newspapers and magazines meet the demands of their audience.В статье представлен результат исследования тематических предпочтений подростков, касающийся содержательного наполнения школьных изданий. Таже представлен анализ причин, которые мешают школьным газетам и журналам соответствовать запросам своей аудитории