Energy performance and energy saving of life-support systems in educational institutions

This article describes the results of energy consumption monitoring analysis in buildings of educational institutions. Relevance of resource-saving technologies use is substantiated in order to improve energy performance and energy saving. The principal model is proposed. This model describes the impact of building automation systems (BAS) and utility systems management tools (USMT) on the accomplished level of energy performance. The method for determination of the minimum requirements for the aforementioned systems in respect of educational institutions is given. Provisions for heat distribution stations upgrading in order to improve heat supply of a building are proposed.The contemporary automation systems of buildings ensure the most efficient control automation for heating, ventilation, lighting, hot water supply systems. This leads to significant increase of operation efficiency and reduction of energy costs. The integrated energy saving processes and functions are optimized depending on the specific climatic conditions in a region, special considerations in respect of building operation and user requirements. It leads to significant reduction in energy consumption and greenhouse gas emission.Keywords: Energy efficiency, energy conservation, energy efficiency, heat supply system, engineering control equipment, automatic control syste

Slowly synchronizing automata and digraphs

We present several infinite series of synchronizing automata for which the minimum length of reset words is close to the square of the number of states. These automata are closely related to primitive digraphs with large exponent.Comment: 13 pages, 5 figure

Reset thresholds of automata with two cycle lengths

We present several series of synchronizing automata with multiple parameters, generalizing previously known results. Let p and q be two arbitrary co-prime positive integers, q > p. We describe reset thresholds of the colorings of primitive digraphs with exactly one cycle of length p and one cycle of length q. Also, we study reset thresholds of the colorings of primitive digraphs with exactly one cycle of length q and two cycles of length p.Comment: 11 pages, 5 figures, submitted to CIAA 201

A Fast Algorithm Finding the Shortest Reset Words

In this paper we present a new fast algorithm finding minimal reset words for finite synchronizing automata. The problem is know to be computationally hard, and our algorithm is exponential. Yet, it is faster than the algorithms used so far and it works well in practice. The main idea is to use a bidirectional BFS and radix (Patricia) tries to store and compare resulted subsets. We give both theoretical and practical arguments showing that the branching factor is reduced efficiently. As a practical test we perform an experimental study of the length of the shortest reset word for random automata with $n$ states and 2 input letters. We follow Skvorsov and Tipikin, who have performed such a study using a SAT solver and considering automata up to $n=100$ states. With our algorithm we are able to consider much larger sample of automata with up to $n=300$ states. In particular, we obtain a new more precise estimation of the expected length of the shortest reset word $\approx 2.5\sqrt{n-5}$.Comment: COCOON 2013. The final publication is available at http://link.springer.com/chapter/10.1007%2F978-3-642-38768-5_1

Synchronizing Automata on Quasi Eulerian Digraph

In 1964 \v{C}ern\'{y} conjectured that each $n$-state synchronizing automaton posesses a reset word of length at most $(n-1)^2$. From the other side the best known upper bound on the reset length (minimum length of reset words) is cubic in $n$. Thus the main problem here is to prove quadratic (in $n$) upper bounds. Since 1964, this problem has been solved for few special classes of \sa. One of this result is due to Kari \cite{Ka03} for automata with Eulerian digraphs. In this paper we introduce a new approach to prove quadratic upper bounds and explain it in terms of Markov chains and Perron-Frobenius theories. Using this approach we obtain a quadratic upper bound for a generalization of Eulerian automata.Comment: 8 pages, 1 figur

Роль полиморфизма гена андрогенового рецептора и неслучайной инактивации хромосомы Х в генезе андрогенной алопеции у женщин репродуктивного возраста

The authors describe the results of a study of polymorphism of the androgen receptor gene by the number of CAG repeats in exon 1 of the androgen receptor gene and non-random X chromosome inactivation in 87 women of childbearing potential (at the average age of 29.5 ± 5.4 years) suffering from androgenic alopecia. They revealed an association between the presence of 'short' (≤ 22) CAG repeats in both alleles of the androgen receptor gene (р < 0,05) and a reliable growth of prevalence of non-random X chromosome inactivation in patients with androgenic alopecia as compared to healthy women (50.7% (39/77) and 16.1% (9/56), respectively, р < 0.05). These data demonstrate a pathogenetic role of polymorphism of the androgen receptor gene and non-random X chromosome inactivation in the development of androgenic alopecia in women of childbearing potential as well as urgency of using molecular and genetic studies to study pathogenetic mechanisms of the disease.Представлены результаты исследования полиморфизма гена андрогенового рецептора по количеству CAG-повторов в 1-м экзоне гена андрогенового рецептора и неслучайной инактивации хромосомы Х у 87 женщин репродуктивного возраста (средний возраст 29,5 ± 5,4 года) с андрогенной алопецией. Установлена ассоциация наличия «коротких» (≤ 22) CAG-повторов в обоих аллелях гена андрогенового рецептора (р < 0,05) и достоверное повышение распространенности неслучайной инактивации хромосомы Х у пациенток с андрогенной алопецией по сравнению со здоровыми женщинами - 50,7% (у 39 из 77) и 16,1% (у 9 из 56) соответственно, (р < 0,05). Полученные данные свидетельствуют о патогенетической значимости полиморфизма гена андрогенового рецептора и неслучайной инактивации хромосомы Х в развитии андрогенной алопеции у женщин репродуктивного возраста, а также об актуальности применения молекулярно- генетических исследований для изучения патогенетических механизмов заболевания

Ground state of graphite ribbons with zigzag edges

We study the interaction effects on the ground state of nanographite ribbons with zigzag edges. Within the mean-field approximation, we found that there are two possible phases: the superconducting (SC) phase and the excitonic insulator (EI). The two phases are separated by a first-order transition point. After taking into account the low-lying fluctuations around the mean-field solutions, the SC phase becomes a spin liquid phase with one gapless charge mode. On the other hand, all excitations in the EI phase, especially the spin excitations, are gapped.Comment: 6 pages, 3 figure