Ultra-Wideband Five-Tier LM-mode Filters Optimized with knowledge-based CAD system

An original knowledge-based CAD system for step-by-step automated development offive-tier filters base don wave guide-dielectric resonators with the lowest LM-modes has been proposed. The basic idea of the system created consists in physical analysis of signals passing through the filter, which is performed on the basis of a known solution for electrodynamic problem of scattering of fundamental electromagnetic waves in a multi-tier structure. Regularities in formation of the filter ultra-wide bandwidths and formalized them in the form of production rules for the system were discovered. A comparative analysis of frequency responses for three- and five-tier UWB filters, optimized with the system has been also provided. The designed filters are intended for the next generation of millimeter waveband wireless systems and conform to the latest standards like ECMA-387, WirelessHD, IEEE 802.15.3c and IEEE 802.11ad.Предложена оригинальная САПР последовательного проектирования пятизвенных фильтров на основе волноводно-диэлектрических резонаторов с низшими LM-модами. Ключевая идея разработанной системы заключается в физическом анализе сигнала прошедшего через фильтр, который рассчитывается на основе известного решения электродинамической задачи рассеяния основной волны на многозвенной структуре. Установлены закономерности формирования ультрашироких полос пропускания фильтров, которые формализованы в виде логических продукций. Проведен сравнительный анализ АЧХ трех- и пятизвенных ультрашироких фильтров, сконструированных системой. Параметры фильтров отвечают новому поколению радиотелекоммуникационных систем миллиметрового диапазона соответствующих новейшим стандартам ECMA-387, WirelessHD, IEEE 802.15.3candIEEE 802.11ad

Intellectual CAD of mm waves WDR filters with increased stop band attenuation

Physical principles of the original intellectual CAD development for three-tier WDR filters with increased stop band attenuation are presented in the article. The electrodynamic parameters of the partly filled resonators with quasi-H101 and quasi- H102 eigenmodes, which influencing on their frequency separation are analysed. The results of filters designing, proper to the recent standards ECMA-387, WirelessHD, IEEE 802.15.3c, IEEE 802.11ad, are presentedУ статті викладено фізичні принципи розробки оригінальної інтелектуальної САПР триланкових ХДР-фільтрів з розширеною областю позасмугового затухання. Проаналізовано електродинамічні параметри частково заповнених резонаторів з квазі- H101 - і квазі H102 модами, які впливають на їх взаємну частотну відстань. Результати конструювання фільтрів відповідають новітнім стандартам ECMA-387, WirelessHD, IEEE 802.15.3c, IEEE 802.11a

AdS/CFT correspondence via R-current correlation functions revisited

Motivated by realizing open/closed string duality in the work by Gopakumar [Phys. Rev. D70:025009,2004], we study two and three-point correlation functions of R-current vector fields in N=4 super Yang-Mills theory. These correlation functions in free field limit can be derived from the worldline formalism and written as heat kernel integrals in the position space. We show that reparametrizing these integrals converts them to the expected AdS supergravity results which are known in terms of bulk to boundary propagator. We expect that this reparametrization corresponds to transforming open string moduli parameterization to the closed string ones.Comment: 23 pages, v2: calculations clarified, references added, v3: sections re-arranged with more explanations, 4 figures and an appendix adde

The Development of Travel and Tourism Industry in Iran

The article presents the results of scientific research devoted to the study of tourism in the countries of the Far East, obtained at one of its stages. The purpose of the article is to characterize the state of rural tourism in Iran. The article shows how the attitude to tourism has changed in this country, uncovering the main reasons for the growth of domestic and international tourist flows in recent years. There are several areas of rural tourism in Iran, which include visits to historical villages and free trade zones, camping in nomad tents, recreation in parks and natural resorts, and trips to the desert. The main research findings of the authors demonstrate the problems facing rural tourism in Iran and identify the risks that arise in this sector of the economy

Pressure Raman effects and internal stress in network glasses

Raman scattering from binary GexSe1-x glasses under hydrostatic pressure shows onset of a steady increase in the frequency of modes of corner-sharing GeSe4 tetrahedral units when the external pressure P exceeds a threshold value Pc. The threshold pressure Pc(x) decreases with x in the 0.15 < x < 0.20 range, nearly vanishes in the 0.20 < x < 0.25 range, and then increases in the 0.25 < x < 1/3 range. These Pc(x) trends closely track those in the non-reversing enthalpy, DHnr(x), near glass transitions (Tgs), and in particular, both DHnr(x) and Pc(x) vanish in the reversibility window (0.20 < x < 0.25). It is suggested that Pc provides a measure of stress at the Raman active units; and its vanishing in the reversibility window suggests that these units are part of an isostatically rigid backbone. Isostaticity also accounts for the non-aging behavior of glasses observed in the reversibility window

Сlinical and hemodynamic characteristics and coronary blood flow in patients with chronic coronary artery disease and type 2 diabetes

Aim. To assess the features of clinical and hemodynamic characteristics and the severity of coronary involvement in patients with chronic coronary artery disease (CAD) with and without diabetes.Material and methods. The study included 100 patients with stable CAD, which were divided into two groups: group I (mean age, 57,9-1,04 years, male/female 35/14) — 49 patients with CAD and type 2 diabetes, II — (60,2-0,9 years, 34/17) — 51 patients without SD. Along with behavioral and biological risk factors, clinical and hemodynamic characteristics were analyzed. All patients underwent coronary angiography.Results. The presence of diabetes in patients with CAD was associated with abdominal obesity and comorbidity of somatic diseases. Among group I patients, electrocardiographic signs of left ventricular hypertrophy, conduction abnormalities, accompanied by a decrease in the left ventricular ejection fraction, impaired diastolic function, and high mean pulmonary artery pressure were significantly more often detected. In patients with CAD and type 2 diabetes, significant right coronary artery (CA) stenoses were more often recorded (39%), while in patients without diabetes, the anterior descending artery was the most susceptible to atherosclerosis. In group I, stenosis of the distal CA third was detected 1,5 times more often (p&lt;0,001), and their diffuse multivessel lesion prevailed by 28% (73% and 45%, respectively, p&lt;0,005). The average SYNTAX score in patients with and without diabetes was 29,2±0,8 vs 22±0,7, respectively (p&lt;0,0005).Conclusion. In patients with CAD and diabetes, more pronounced atherosclerotic coronary involvement (diffuse multivessel CAD) was revealed, which should be taken into account when planning further treatment. The risk of adverse cardiovascular events will always be present with percutaneous coronary interventions

Formation of the Talysh Ethnos Worldview under Geoethnic Conservation Area Conditions

Formation and development of the Talysh ethnic consciousness under the conditions of the Talysh ‘geoethnic reserve’ have been analyzed. Certain ethnoforming elements of the Talysh culture, i.e. factors promoting preservation of the basic constants of the Talysh ethnic consciousness, have been revealed. On the one hand, it is a cult of rocks, stones, groves and trees, and on the other hand it is worship of air, water, land and fire, which with the appearance of Zoroastrianism at first, and later of Shia Muslim, were not absorbed and peripheralized, but filled with new religious and ethical contents presenting moral and esthetic ideals of the Talysh people. The role of a myth and religion as an obligatory early stage of formation of the Talysh ethnic culture has been determined; regularities of formation of the Talysh ethnic consciousness have been shown; steps of ethnogenesis and a world view of the Talysh ethnos have been enlightened. Introduction of strange cultural tradition components could not eliminate the existing valuable attitude of ‘the geoethnic reserve’, but right opposite, they created syncretic environment stimulating evolution of the Talysh ethnic consciousness towards world judgment in the system of moral and ethical images considerably enriching the Talysh ethnos outlook. Having been formed this syncretic environment effected significantly the Talysh ethnos social attitude, as well as, predetermined a prevalent character of religious values in Talyshes spiritual and socio-political life