Electric field induced strong localization of electrons on solid hydrogen surface: possible applications to quantum computing

Two-dimensional electron system on the liquid helium surface is one of the leading candidates for constructing large analog quantum computers (P.M. Platzman and M.I. Dykman, Science 284, 1967 (1999)). Similar electron systems on the surfaces of solid hydrogen or solid neon may have some important advantages with respect to electrons on liquid helium in quantum computing applications, such as larger state separation $\Delta E$, absence of propagating capillary waves (or ripplons), smaller vapor pressure, etc. As a result, it may operate at higher temperatures. Surface roughness is the main hurdle to overcome in building a realistic quantum computer using these states. Electric field induced strong localization of surface electrons is shown to be a convenient tool to characterize surface roughness.Comment: 4 pages, 3 figure

On the possibility to supercool molecular hydrogen down to superfluid transition

Recent calculations by Vorobev and Malyshenko (JETP Letters, 71, 39, 2000) show that molecular hydrogen may stay liquid and superfluid in strong electric fields of the order of $4\times 10^7 V/cm$. I demonstrate that strong local electric fields of similar magnitude exist beneath a two-dimensional layer of electrons localized in the image potential above the surface of solid hydrogen. Even stronger local fields exist around charged particles (ions or electrons) if surface or bulk of a solid hydrogen crystal is statically charged. Measurements of the frequency shift of the $1 \to 2$ photoresonance transition in the spectrum of two-dimensional layer of electrons above positively or negatively charged solid hydrogen surface performed in the temperature range 7 - 13.8 K support the prediction of electric field induced surface melting. The range of surface charge density necessary to stabilize the liquid phase of molecular hydrogen at the temperature of superfluid transition is estimated.Comment: 5 pages, 2 figure

Development of human capital in the system of economic categories of work

Today, human capital is one of the main factors in the formation of the knowledge economy, which is the highest stage in the development of an innovative, post-industrial economy. The development of intellectual and spiritual capabilities of a person, as well as the accumulation of human capital, which has a strong influence on the productivity and quality of labor, becomes one of the priorities for the future development of the state. This article discusses the development of human capital in the system of economic categories of labor.peer-reviewe

Semantic-Syntactic and Communicative-Pragmatic Features of Translation of Sentences with Coordinative Conjunctions from Russian into Korean Language

The article covers the problems of translation of sentences with coordinative conjunctions into Korean. The object of the analysis is sentences with basic coordinative conjunctions i ‘and,’ a , no ‘but,’ ili ‘or.’ The novelty of the work lies in the fact that semantic-syntactic and communicative-pragmatic features of situations in the context of which the use of these unions occurs are taken as the starting point of translation, on the basis of which equivalent lexical and grammatical means of the Korean language are selected. The work is carried out on the material of artificially compiled examples, and the results are illustrated by facts from the natural language. This approach is determined by the need to combine educational-methodological and scientific-practical approaches in the consideration of this little-studied problem. It is established that the expression of coordinative relations in the Korean language, on the one hand, is closely related to the grammatical structure of sentences-statements, but to some extent is based on the context by which the speaker and listener concretize a communicative vector given by the grammar. On the other hand, in the Russian language, the means of coordinative relations are more specific in their specialization, but due to the high degree of abstraction of their semantics, they require a proper level of interpretation and understanding from the translator

Giant piezoelectric response in textured piezoceramics with tetragonal tungsten bronze structure

This work was supported by the Ministry of Education and Science of the Russian Federation (research projects No. 3.1649.2017/4.6 and № 3.6439.2017)

Dynamics of the north western coast of the azov sea

UA: Современная динамика склонов и побережья морей как отображение общего мобилизма литосферы, взаимодействия основных оболочек Земли под влиянием космических, планетарных, региональных и локальных факторов является актуальной научной и практической проблемой. В цепочке геолого-геоморфологических процессов склоновые гравитационные процессы являются наиболее активным звеном и непосредственно влияют на жизнедеятельность человека. В свою очередь, хозяйственная деятельность человека вносит существенные изменения в процесс эволюции геологической среды, в том числе в характер протекания склоновых процессов. EN: Development of slope gravity processes on the coast of the Sea of Azov is a serious environmental and geological problem and requires topical engineering and geological research and solutions. Slope gravitational processes adversely affect the state of the soil layer, causing erosion and washing away of soils, contribute to siltation and contamination of water bodies. Movements on the slopes cause destruction of economic objects, residential buildings, loss of agricultural land. To prevent the negative consequences of slope processes, their deep and systematic study is necessary

PRODUCTION OF THIN CERAMIC FILMS BY AEROSOL DEPOSITION

The aerosol deposition method is designed for the formation of ceramic films for various purposes without the need for further sintering. The study examines the influence of various parameters on the quality of the film.Работа выполнена в соответствии с государственным заданием Института химии твердого тела УрО РАН (тема № АААА-А19-119031890026-6)

Possibilities of transcranial direct current stimulation (tDCS) use in elite sport

Transcranial direct current stimulation has proven to be the method that can modulate neural activity in various cases. As this method has been shown to be effective in improving muscular strength, reaction time and accuracy, motor learning, it seems to be promising in elite sports.This paper provides an overview of studies on tDCS and its impact on central nervous system functioning, with an emphasis on potential sports utility. This review demonstrates that the basic mechanism of the effect of tDCS on nervous system functioning is its ability to modulate the excitability of neurons.tDCS is able to influence various components of electrocortical potentials, the amplitude of the motor evoked potential, as well as the mechanisms of long-term potentiation and, as a consequence, the cellular mechanisms of motor learning and neuroplasticity in general. The beneficial effect of tDCS on attention selectivity and signal detection has been noted. It is also shown that tDCS can accelerate learning and enhance performance in a range of complex cognitive tasks.In addition, a number of studies showing that tDCS can increase the efficiency of performing arithmetic and problem solving tasks are considered.In the context of sports, the influence of tDCS over motor areas on motor learning and on the accuracy of voluntary movements seems to be important. Its ability to influence speed and strength indicators, namely, the maximum isometric force of various muscle groups and explosive strength, as well as endurance indicators seems promising, too. The review also shows that tDCS is reasonably safe and that serious adverse effects are extremely rare; the most common adverse effect is local skin irritation due to poor electrode placement

Quality of colonoscopy in an emerging country: A prospective, multicentre study in Russia

Background: The quality of colonoscopy has been related to a higher risk of interval cancer, and this issue has been addressed extensively in developed countries. The aim of our study was to explore the main quality indicators of colonoscopy in a large emerging country. Methods: Consecutive patients referred for colonoscopy in 14 centres were prospectively included between July and October 2014. Before colonoscopy, several clinical and demographic variables were collected. Main quality indicators (i.e. caecal intubation rate, (advanced) adenoma detection rate, rate of adequate cleansing and sedation) were collected. Data were analysed at per patient and per centre level (only for those with at least 100 cases). Factors associated with caecal intubation rate and adenoma detection rate were explored at multivariate analysis. Results: A total of 8829 (males: 35%; mean age: 57 + 14 years) patients were included, with 11 centres enrolling at least 100 patients. Screening (including non-alarm symptoms) accounted for 59% (5188/8829) of the indications. Sedation and split preparation were used in 26% (2294/8829) and 25% (2187/8829) of the patients. Caecal intubation was achieved in 7616 patients (86%), and it was ≥85% in 8/11 (73%) centres. Adenoma detection rate was 18% (1550/8829), and it was higher than 20% in five (45%) centres, whilst it was lower than 10% in four (33%) centres. At multivariate analysis, age (OR: 1.020, 95% CI: 1.015–1.024), male sex (OR: 1.2, 95% CI: 1.1–1.3), alarm symptoms (OR: 1.8, 95% CI: 1.7–2), split preparation (OR: 1.4, 95% CI: 1.2–1.6), caecal intubation rate (OR: 1.6, 95% CI: 1.3–1.9) and withdrawal time measurement (OR: 1.2, 95% CI: 1.6–2.1) were predictors of a higher adenoma detection rate, while adequate preparation (OR: 3.4: 95% CI: 2.9–3.9) and sedation (OR: 1.3; 95% CI: 1.1–1.6) were the strongest predictors of caecal intubation rate. Conclusions: According to our study, there is a substantial intercentre variability in the main quality indicators. Overall, the caecal intubation rate appears to be acceptable in most centres, whilst the overall level of adenoma detection appears low, with less than half of the centres being higher than 20%. Educational and quality assurance programs, including higher rates of sedation and split regimen of preparation, may be necessary to increase the key quality indicators

DEVELOPMENT OF А RIBBON WIND POWER STATION

The article describes a ribbon wind power plant, belonging to the class of the wind turbine rotor. A feature of the installation is inclined rotation axis and a number of standardized modules. A distinctive feature is the modularity of wind turbines, the ability to create an installation of any capacity from tens of watts for domestic use up to tens of kW for settlements, infrastructure and various anti-crisis objectives.В статье описана ленточно-винтовая ветроэнергетическая установка, относящаяся к классу роторных ВЭУ. Особенностью установки является наклонная ось вращения и ряд унифицированных модулей. Отличительной чертой ВЭУ является модульность, т. е. возможность создания установки любой мощности в диапазоне от десятков Вт для бытовых нужд до десятков кВт для населенных пунктов, объектов инфраструктуры и различных антикризисных целей