Tunable beam steering enabled by graphene metamaterials

We demonstrate tunable mid-infrared (MIR) beam steering devices based on multilayer graphene-dielectric metamaterials. The effective refractive index of such metamaterials can be manipulated by changing the chemical potential of each graphene layer. This can arbitrarily tailor the spatial distribution of the phase of the transmitted beam, providing mechanisms for active beam steering. Three different beam steerer (BS) designs are discussed: a graded-index (GRIN) graphene-based metamaterial block, an array of metallic waveguides filled with graphene-dielectric metamaterial and an array of planar waveguides created in a graphene-dielectric metamaterial block with a specific spatial profile of graphene sheets doping. The performances of the BSs are numerically analyzed, showing the tunability of the proposed designs for a wide range of output angles (up to approximately 70°). The proposed graphene-based tunable beam steering can be used in tunable transmitter/receiver modules for infrared imaging and sensing.This work was supported in part by the Spanish Government under Contract TEC2014- 51902-C2-2-R and the Government of the Russian Federation [Grant No. 074-U01]. B. O. is sponsored by the Spanish Ministerio de Economía y Competitividad under grant FPI BES- 2012-054909. M.B. is sponsored by the Spanish Government via RYC-2011-08221. I.K. is sponsored by the Russian Foundation for Basic Research under grant No. 14-07-31272

Vasoprotective effect of effective lipid-lowering therapy in patients with <i>ST</i>-segment elevation myocardial infarction

Aim. To study the vasoprotective effects of atorvastatin depending on the achievement of the target level of low-density lipoprotein cholesterol (LDL-C) in patients with ST-segment elevation myocardial infarction (STEMI) within 48 weeks of follow-up. Materials and methods. Included were 112 STEMI patients who received atorvastatin 204080 mg. On days 79 from the onset of the disease, after 24 and 48 weeks, ultrasound examination of the carotid arteries with RF technology and applanation tonometry were performed, the lipid profile was determined. The patients were divided into groups: group 1 (n=41) of highly effective therapy (HET) who achieved the target LDL-C after 24 and 48 weeks; group 2 (n=29) in relatively effective therapy (RET) achieving target values at 24th or 48th week; group 3 (n=42) insufficiently effective therapy (IET) did not reach the target LDL-C. Results. When examining the carotid arteries in the HET group, the intima-media thickness (IMT) decreased by 10.713.1%, the b index by 14.926.3% after 2448 weeks. In the RET group, the IMT regression was 10.413.3%; b index 23.9% by the 48th week. In the IET group, the b index decreased by the 48th week by 14.3%. According to applanation tonometry in the HET group, the central pressure did not change. In the RET group, systolic pressure in the aorta increased by 1015.7% after 2448 weeks, pulse pressure by 33.9% by the end of observation. With IET, the increase was 8.66.8 and 19.825.9%, respectively. The odds ratio of developing endpoints in the RET group was 4.7 (95% CI 1.226.4; p=0.02), in the IET group 3.9 (95% CI 1.124.8; p=0.03) compared with HET. Conclusion. The most pronounced vasoprotective effect and a decrease in cardiovascular risk are associated with the achievement of the target LDL-C throughout the entire treatment period

Multicriteria Approach to Assessing Quality of Life Population the Krasnoyarsk Region on Basis of Generalized Desirability Function

В статье рассмотрен подход к оценке качества жизни населения муниципальных территорий Красноярского края на основе обобщённой функции желательности. Функция желательности Харрингтона успешно применяется при решении оптимизационных задач в различных областях исследований. В положительных свойствах исследователи отмечают непрерывность, монотонность и гладкость, то есть свойства, необходимые для свёртки разнородной информации. К недостаткам относят субъективизм (при назначении шкалы или весовых коэффициентов) и разнородность информации (по скорости изменений или значимости признаков), подвергающейся свёртке. Исследование материала проводилось с помощью статистического анализа демографических, социальных, экологических, экономических, данных здравоохранения с 2017 по 2021 годы, математического метода – обобщённой функции желательности. Данная методика позволила оценить качество жизни населения Красноярского края по 30 показателям. Исходные данные взяты с официального сайта Федеральной службы государственной статистики, Министерства экологии и рационального природопользования Красноярского края. Многокритериальный подход позволяет комплексно оценить качество жизни населения региона и сравнить выбранные территории. В результате исследования с помощью обобщённой функции желательности был получен рейтинг муниципальных районов Красноярского края по качеству жизни, который отображён через геоинформационную систему QGIS. Показатель качества жизни населения в пяти муниципальных образованиях края: Абанском, Боготольском, Идринском, Каратузском и Краснотуранском можно считать хорошим, в диапазон с плохим (низким) показателем качества жизни попали Тасеевский и Березовский районы, во всех остальных муниципальных образованиях данный показатель можно считать удовлетворительным. Анализ качества жизни по макрорегионам показал неоднородность уровня для входящих в них муниципальных округов. Наиболее высокие средние значения параметра отмечены в Южном и Западном, во всех остальных макрорегионах средние значения можно считать удовлетворительными. Для сохранения человеческого капитала на территории края необходимо улучшать качество окружающей среды, улучшать демографическую ситуацию, повышать уровень и качество медицинского обслуживания. Практическая значимость работы заключается в выявлении социально-экологического рейтинга муниципальных образований территории Красноярского края, на основе которого могут быть реализованы мероприятия, направленные на улучшение качества жизни населения Красноярского краяThe article considers an approach assessing quality of life population municipal territories of Krasnoyarsk region on basis of generalized desirability function. The Harrington’s desirability function is successfully used in solving optimization problems in various fields of research. In positive qualities, scientists mark continuity, monotony and smoothness, i.e. qualities necessary for convolution of dissimilar information. Subjectivism (when assigning scales or weighting coefficients) and diversity of information (in terms of the rate of change or significance of features) undergoing convolution are disadvantages. Material was studied using statistical analysis of demographic, social, environmental, economic and health data from 2017 to 2021, a mathematical method – generalized desirability function. This technique made it possible to assess quality of life population Krasnoyarsk Territory by 30 parameters. Source data is taken from official website of Federal State Statistics Service, Ministry Environment and Rational Management of the Krasnoyarsk Krai. Multicriteria approach makes it possible to comprehensively assess the quality to life for population in region and compare selected territories. As a consequence of the study, using generalized desirability function, a rating of municipal districts of the Krasnoyarsk Territory in terms of quality of life was obtained, which is shown through the geographic information system QGIS. The indicator quality of life population in five municipalities of the krai: Abansky, Bogotolsky, Idrinsky, Karatuzsky and Krasnoturansky can be considered good, Taseyevsky and Berezovsky districts fell into the range with a poor (low) indicator of quality life, in all other municipalities this indicator can be considered satisfactory. Analysis quality of life by macro-regions showed diversity of indicator for municipal districts included in them. The highest average values of parameter are noted in Southern and Western regions, in all other macro-regions the average values can be considered satisfactory. In order to preserve human capital in territory of the region, it’s necessary to improve quality of environment, improve demographic situation, and improve quality of medical care. The practical significance concludes in identifying socio-ecological and economic rating municipalities of the Krasnoyarsk Territory, on basis of which measures will can be taken to improve quality life of studied regio

Frequency selective transmission scheme for EBG horn antennas

In this work a new integrated scheme of frequency selective transmission based on electromagnetic band gap (EBG) technology is presented. In the proposed configuration the radiofrequency signal is received by an EBG horn antenna and then filtered by an EBG cavity via the resonant coupling between two closed EBG waveguides and an EBG hollow defect (waveguide-to-cavity-to-waveguide coupling). The paper presents the designs of novel EBG horn antennas with competitive characteristics and demonstrates the concept of using different types of hollow EBG defects, such as point defects, void-like defects and tapers, for creating compact, efficient and integrated devices for submillimetre wavelenghts.4 page(s

All-dielectric woodpile horn antennas

This paper is devoted to EBG horn antennas. This novel type of all-dielectric horn antennas is based on complex hollow defects in woodpile structures and can be used for creating compact arrays and provide a promising solution for millimeter and terahertz devices. A novel concept of feeding EBG horn antennas via evanescent fields existing in periodic structures is presented. The principle of creating all-dielectric pyramidal horn antennas based on woodpile structure with hollow defects is proposed. Different horn antennas based on woodpile structures and characterized by large operating bandwidths and high levels of directivity and efficiency were designed, fabricated and measured.3 page(s