EQUIVALENT TESTS METHOD FOR THE LARGE GTE PARTS LOW CYCLE DURABILITY PREDICTION ON THE BASIS OF SPECIMENS WITH A STRESS CONCENTRATOR TESTS

The low cycle fatigue equivalent test method based on the application of development specimens whose stress and strain state shall be similar to stress and strain state of the part to be investigated is given in this examination. Stiffness ratio of the stressed state is used as the similarity criterion of stress and strain state of specimens and part The method was successfully applied on gas turbine engine low pressure compressor disk. Round specimens with V-concentrator were used as equivalent specimens

Гендерные особенности распространенности поведенческих факторов риска у жителей Санкт-Петербурга

Background: In developed countries there are significant gender differences in lifetime expectancy that can be explained by behavioral risk factors (RF).Objective: The aim of our study was to estimate gender features of behavioral RF in general population of Saint-Petersburg, Russia.Methods: As a part of all-Russian epidemiology survey ESSE-RF a random sampling of 1600 Saint-Petersburg inhabitants (25-64 y.o.) stratified by age and sex was performed. All participants filled in the questionnaire. Anthropometry (weight, height, body-mass index (BMI), waist circumference (WC)) and fasting blood-tests (lipids, glucose by Abbott Architect 8000 (USA)) were performed.Results: There were examined 573 (36%) men and 1027 (64%) women. No gender differences in obesity were found according to BMI criteria — in 178 (31.2%) women and 352 (35.1%) men. Obesity was more often detected in females according to WC criteria: АТРIII — 44.1 vs 30.3%; IDF 51.2 vs 66.4% (p 0.001 for both). Linear regression analysis was performed and age was associated with BMI — 1.6 kg/m2/decade, WC in women — 5,2 cm/decade and WC in men — 2.8 cm/decade, р 0.001 for all anthropometric parameters. Optimal level of physical activity was equally documented in both genders — 540 (61.2%) women and 286 (58.9%) men. Daily intake of sweets was lower in men — 228 (39.8%) vs 539 (52.5%) in women (p 0.001). 810 (50,6%) of trial subjects were non-smokers, 395 (24,7%) were former smokers, and 395 (24,7%) were smokers at the moment of trial. The higher number of female smokers was observed — 194 (19.1%).Conclusion: A high prevalence of obesity is observed in sample of Saint-Petersburg inhabitants — it is higher among women according to WC criteria regardless of menopause, possibly due to bigger sweets consumption. Males smoke more often and consume less fresh fruits and vegetables which is accompanied by a higher prevalence of hyperglycemia and hypertriglyceridemia.В развитых странах отмечаются гендерные различия в ожидаемой продолжительности жизни, что может быть объяснено профилем поведенческих факторов риска.Цель исследования: изучить гендерные особенности профиля поведенческих факторов сердечно-сосудистого риска в популяции жителей Санкт-Петербурга. Методы: в рамках многоцентрового эпидемиологического наблюдательного исследования ЭССЕ-РФ была сформирована случайная выборка из жителей Санкт-Петербурга, стратифицированная по полу и возрасту. Участники заполнили стандартный опросник, была выполнена антропометрия: рост, вес, индекс массы тела (ИМТ), окружность талии (ОТ). Натощак определен липидный спектр, уровень гликемии.Результаты: обследованы 1600 человек, из них мужчин 573 (35,9%), женщин 1027 (64,1%). Ожирение у мужчин и женщин встречалось в 31–66% случаев (по критерию ИМТ — у 31,2% мужчин и 35,1% женщин; по критерию метаболического синдрома (АТРIII) — у 30,3 и 44,1%; по критерию IDF — у 51,2 и 66,4%, соответственно; по обоим критериям ОТ значимо чаще встречалась у женщин, (p 0,001). Линейный регрессионный анализ позволил установить ассоциацию возраста с ИМТ (1,6 кг/м2 на 1 декаду), с ОТ у женщин (5,2 см/декада) и у мужчин (2,8 см/декада; для всех показателей р 0,001). Оптимальный уровень двигательной активности не различался у мужчин (286; 58,9%) и женщин (540; 61,2%). Ежедневное потребление сладостей значимо реже отмечено у мужчин (228; 39,8%) по сравнению с женщинами (539; 52,5%; р 0,001). Не курили 810 (50,6%), 395 (24,7%) курили в прошлом и 395 (24,7%) курили в момент опроса; наблюдалось большое число курящих женщин — 194 (19,1%).Заключение: среди жителей Санкт-Петербурга регистрируется высокая распространенность ожирения (значимо чаще среди женщин, согласно критерию ОТ, вне зависимости от наличия менопаузы, возможно, за счет большего потребления сладких продуктов). Мужчины значимо больше курят и реже потребляют свежие овощи и фрукты, что сопровождается большей распространенностью гипергликемии и гипертриглицеридемии

Quantum walks: a comprehensive review

Quantum walks, the quantum mechanical counterpart of classical random walks, is an advanced tool for building quantum algorithms that has been recently shown to constitute a universal model of quantum computation. Quantum walks is now a solid field of research of quantum computation full of exciting open problems for physicists, computer scientists, mathematicians and engineers. In this paper we review theoretical advances on the foundations of both discrete- and continuous-time quantum walks, together with the role that randomness plays in quantum walks, the connections between the mathematical models of coined discrete quantum walks and continuous quantum walks, the quantumness of quantum walks, a summary of papers published on discrete quantum walks and entanglement as well as a succinct review of experimental proposals and realizations of discrete-time quantum walks. Furthermore, we have reviewed several algorithms based on both discrete- and continuous-time quantum walks as well as a most important result: the computational universality of both continuous- and discrete- time quantum walks.Comment: Paper accepted for publication in Quantum Information Processing Journa

Observation of Bloch oscillations with a threshold

We demonstrate experimentally Bloch oscillations, which occur above a certain threshold value of the effective potential gradient in lattices with specially modulated coupling between the neighboring sites. We formulate the general conditions for this phenomenon, arising due to the competition between the tilting and broadening of the transmission band, and explain why no threshold was present in any previous observations. Our experiments are performed in inhomogeneous photonic lattices, which represent the process of quantum two-mode squeezing in Fock space, underpinning a fundamental quantum-classical correspondence