Cascade Structure of Digital Predistorter for Power Amplifier Linearization

In this paper, a cascade structure of nonlinear digital predistorter (DPD) synthesized by the direct learning adaptive algorithm is represented. DPD is used for linearization of power amplifier (PA) characteristic, namely for compensation of PA nonlinear distortion. Blocks of the cascade DPD are described by different models: the functional link artificial neural network (FLANN), the polynomial perceptron network (PPN) and the radially pruned Volterra model (RPVM). At synthesis of the cascade DPD there is possibility to overcome the ill conditionality problem due to reducing the dimension of DPD nonlinear operator approximation. Results of compensating nonlinear distortion in Wiener–Hammerstein model of PA at the GSM–signal with four carriers are shown. The highest accuracy of PA linearization is produced by the cascade DPD containing PPN and RPVM

Use of internet resources in the process of the Olympiad

Increased student interest in studying subjects is possible through active involvement in participation in competitions and contests. On the example of the developed and implemented Olympiad site, the realized opportunities and the mechanism of holding such an event, as well as the results obtained during the implementation of a single resource, are consideredПовышение заинтересованности студентов в изучении предметов, возможно через активное вовлечение к участию в олимпиадах и конкурсах. На примере разработанного и внедренного сайта олимпиады рассматриваются реализованные возможности и механизм проведения подобного мероприятия, а также результаты, полученные в ходе внедрения единого ресурс

Influence of the substrate-induced strain and irradiation disorder on the Peierls transition in TTF-TCNQ microdomains

The influence of the combined effects of substrate-induced strain, finite size and electron irradiation-induced defects have been studied on individual micron-sized domains of the organic charge transfer compound tetrathiafulvalene-tetracyanoquinodimethane (TTF-TCNQ) by temperature-dependent conductivity and current-voltage measurements. The individual domains have been isolated by focused ion beam etching and electrically contacted by focused ion and electron beam induced deposition of metallic contacts. The temperature-dependent conductivity follows a variable range hopping behavior which shows a crossover of the exponent as the Peierls transition is approached. The low temperature behavior is analyzed within the segmented rod model of Fogler, Teber and Shklowskii, as originally developed for a charge-ordered quasi one-dimensional electron crystal. The results are compared with data obtained on as-grown and electron irradiated epitaxial TTF-TCNQ thin films of the two-domain type

Практические аспекты оценки и анализа инновационного развития регионов

Дата поступления 15 января 2019 г.; дата принятия к печати 4 апреля 2019 г.Received January 15, 2019; accepted April 4, 2019.Innovative development of territories is strategically important for the prosperity of any country. This article aims at describing original methodology for comprehensive assessment of innovative development of Russian regions. The proposed model takes into account specific features of innovative activity of regions and identifies growth potential and resources of territories, taking into account not only the innovation environment, but also areas of innovative activity. The study relies on the statistical data provided by the Central Statistical Database and the Unified Interdepartmental Information and Statistical System. In the course of processing and analyzing data, the index method, the multidimensional average method, factor-index analysis and other statistical data processing methods are used. The research involves ranking Russian regions according to their levels of innovative development and further dividing them into groups of powerful, strong, medium and weak innovators. We also analyzed the dynamics of innovation in the regions by looking at the changes in their ranking positions. The research findings brought to light the uneven development of Russian regions. The proposed assessment toolkit can be further used for drawing individual profiles for regions and formulating recommendations and guidelines for these regions’ development by taking into consideration their strengths and weaknesses. The results of this study have theoretical and practical significance and can be used as a tool for management of innovative activities both at the level of individual territories and at the national level.Инновационное развитие территорий является стратегически важным для процветания любой страны. Целью данной статьи является описание оригинальной методики комплексной оценки инновационного развития российских регионов. Предложенная модель учитывает особенности инновационной активности регионов и определяет потенциал роста и ресурсы территорий с учетом не только инновационной среды, но и направлений инновационной деятельности. Исследование опирается на статистические данные, предоставленные Центральной статистической базой данных и Единой межведомственной информационно-статистической системой. В процессе обработки и анализа данных используются индексный метод, метод многомерного среднего, факторный индексный анализ и другие статистические методы обработки данных. Исследование включает в себя ранжирование российских регионов по уровням инновационного развития и дальнейшее разделение их на группы наиболее сильных, сильных, средних и слабых новаторов. Мы также проанализировали динамику инноваций в регионах, посмотрев на изменения их рейтинговых позиций. Результаты исследования выявили неравномерность развития российских регионов. Предлагаемый инструментарий оценки может быть далее использован для составления отдельных профилей для регионов и разработки рекомендаций и руководящих принципов для развития этих регионов с учетом их сильных и слабых сторон. Результаты данного исследования имеют теоретическое и практическое значение и могут быть использованы в качестве инструмента управления инновационной деятельностью как на уровне отдельных территорий, так и на национальном уровне

Empathy parameters as a factor of integration of students’ social tolerance

Currently, various conflicts often arise that contribute to the destabilization and separation of society. The question arises: how to consolidate social relations in the educational environment, how to avoid aggression and bullying, social isolation and similar problems? Empathic abilities have traditionally been considered a means of increasing tolerance in society. The paper considers the ambiguous contribution of empathy parameters to the manifestation of social tolerance of students. Only the conative parameters of empathy are a factor of integration, i. e. student cohesion, unlike empathy channels, which are not related to the social tolerance of students.В настоящее время часто возникают разнообразные конфликты, способствующие дестабилизации и разъединению общества. Возникает вопрос: как сплотить социальные отношения в образовательной среде, как избежать агрессии и буллинга, социальной изоляции и подобных проблем? Эмпатические способности традиционно считались средством увеличения толерантности в обществе. В работе рассматривается неоднозначный вклад параметров эмпатии в проявление социальной толерантности студентов. Лишь конативные параметры эмпатии являются фактором интеграции, т. е. сплочения студентов, в отличие от каналов эмпатии, которые не связаны с социальной толерантностью студентов

Technology for Creation and Detailed Analysis of Polymer Composites with Uniform Distribution of Quantum Dots and Liquid Crystals

One of the most actual tasks in biotechnology is the creation of a new generation of nanobiosensors with improved brightness, photo stability, and sensitivity. Compositions of polymers and colloidal quantum dots (QDs) are the most promising base to develop such sensors. This work presents the technology for creation and detailed analysis of nanostructured composite films based on polypropylene matrices with uniformly distributed CdSe/ZnS quantum dots and liquid crystals. Methods of optical microscopy, scanning probe microscopy and confocal fluorescen tmicrospectroscopy were used. The presence of liquid crystals in the composite allows additional control of QDs fluorescence. The methodology proposed is applicable not only to polypropylene, but also to other porous polymers. The results of this work indicate the possibility of creating high-quality polymer/QDs composite materials and open the way to the development of nanomaterials (nanosensors) with optical properties sensitive to various environmental parameters (electric field, photo irradiation, mechanical action, etc.). Keywords: quantum dot-polymer composites, nanoporous polypropylene, fluorescenc

Complex biochemical characteristics of <i>Coriandrum sativum</i> L.

Background.  Coriandrum sativum L. is a valuable vegetable crop with early maturity and high nutritional benefits. Green biomass of coriander is rich in vitamins, especially ascorbic acid and carotene. The feasibility of using coriander as a natural food additive is due to its high antioxidant activity. The aim of this research was to study the biochemical composition of the green biomass in the accessions of C. sativum from the VIR global collection and identify promising accessions for use in breeding for quality.Materials and methods. The green biomass of  67 coriander accessions from different countries maintained in the VIR collection served as the research material. The study was carried out according to the guidelines developed by VIR.Results. As a result of the study, the feasibility of using C. sativum as a source of bioactive compounds was theoretically justified and experimentally confirmed, thus attesting to the prospects of coriander accessions from the VIR collection for quality-targeted breeding programs. New data were obtained on the biochemical composition of coriander green biomass. A factor determining such biochemical composition is the genotypic features of coriander associated with its origin. Biochemical parameters in coriander varied significantly depending on the origin of an accession. The highest variability was observed in the content of carotenes (CV 41%). The effect of an accession’s precocity was not confirmed. Sources for individual quality indicators were highlighted.Conclusion. Accessions with an optimal component composition for a balanced human diet were identified and recommended for quality-oriented breeding, including the development of cultivars for health-friendly, curative and preventive nutrition. The selected accessions are of interest as source material for breeding programs and practical utilization