Transverse decoherence and coherent spectra in long bunches with space charge

The transverse bunch spectrum and the transverse decoherence/recoherence following an initial bunch offset are important phenomena in synchrotrons and storage rings, and are widely used for beam and lattice measurements. Incoherent shifts of the particles betatron frequency and of the synchrotron frequency modify the transverse spectrum and the bunch decoherence. In this study we analyze the effects of transverse space charge and of the rf nonlinearity on the decoherence signals. The transverse bunch decoherence and the resulting coherent spectra are measured in the SIS18 synchrotron at GSI Darmstadt for different bunch parameters. Particle tracking simulations together with an analytical model are used to describe the modifications in the decoherence signals and in the coherent spectra due to space charge and the rf bucket nonlinearity.Comment: Submitted on May 7 2012 to Physical Review Special Topics - Accelerators and Beam

MASTER prompt and follow-up GRB observations

There are the results of gamma-ray bursts observations obtained using the MASTER robotic telescope in 2007 - 2009. We observed 20 error-boxes of gamma-ray bursts this period.The limits on their optical brightnesses have been derived. There are 5 prompt observations among them, obtained at our very wide field cameras. Also we present the results of the earliest observations of the optical emission of the gamma-ray bursts GRB 050824 and GRB 060926.Comment: 10 pages, 2 figure

Master Robotic Net

The main goal of the MASTER-Net project is to produce a unique fast sky survey with all sky observed over a single night down to a limiting magnitude of 19 - 20mag. Such a survey will make it possible to address a number of fundamental problems: search for dark energy via the discovery and photometry of supernovas (including SNIa), search for exoplanets, microlensing effects, discovery of minor bodies in the Solar System and space-junk monitoring. All MASTER telescopes can be guided by alerts, and we plan to observe prompt optical emission from gamma-ray bursts synchronously in several filters and in several polarization planes.Comment: 10 pages, 8 figure

РЕАЛЬНАЯ СТОИМОСТЬ ИПОТЕЧНОГО КРЕДИТОВАНИЯ И ПУТЬ К ЕЁ ДОСТУПНОСТИ

The article considers the availabilityof mortgage loans to the population,estimated nominal and real value of the mortgage. Describes the current patternand proposes a way to improve it.Встатьерассматриваетсядоступность ипотечного кредитования для населения, оценивается номинальная и реальная стоимость ипотечного кредита. Описывается существующая картина и предлагается путь к её улучшению

Математическая модель подключения оптимального числа потенциальных потребителей тепла к тепловой сети

In the modern world, the efficient use of energy is an extremely important aspect of human activity. In particular, heat supply systems have significant economic, environmental and social importance for both heat consumers and heat supply organizations. The economic status of all participants in the heat supply process depends on the efficiency of the functioning of the heat supply systems. The reliability of the functioning of systems depends on vital processes such as the work of hospitals and industrial enterprises. With such a close network communication, reliable and efficient operation of power supply systems is critical. In this article, ways to improve the efficiency of heat supply systems are considered. A mathematical model for improved planning of heat supply systems by connecting the optimal set of new heat consumers is presented. For each single customer, when there is an alternative option for connecting this consumer to the existing heat network, it is possible to choose the only optimal solution. This becomes possible due to the restrictions and the procedure for selecting variants from a subset of binary variables corresponding to alternatives. The procedure for finding the optimal number of consumers for connection to the existing heat network is presented, which is the rationale for increasing the number of existing consumers of the heat network. The testing was carried out and the results of the mathematical model by an example of test heat networks are presented. Directions of further study of increasing the efficiency of heat supply systems and integrating the presented mathematical model with modern software complexes are determined.В современном мире эффективное использование энергоносителей является крайне важным аспектом человеческой деятельности. В частности, системы теплоснабжения имеют значительное экономическое, экологическое и социальное значение как для потребителей тепла, так и для теплоснабжающих организаций. От эффективности функционирования систем теплоснабжения зависит экономическое состояние всех участников процесса теплоснабжения. От надежности функционирования систем зависят жизненно важные процессы, такие как работа больниц и промышленных предприятий. При такой тесной сетевой коммуникации критически важно безотказное и эффективное функционирование систем энергоснабжения. В данной статье рассмотрены пути повышения эффективности работы систем теплоснабжения. Представлена математическая модель для планирования работы систем теплоснабжения путем подключения оптимального множества новых потребителей тепла. Для отдельно взятого потенциального потребителя, каждый раз, когда возникает альтернативный вариант подключения этого потребителя к существующей тепловой сети, возможно выбрать единственное оптимальное решение. Это становится возможно за счет наложения ограничений и процедуры отбора вариантов из подмножества бинарных переменных, соответствующих альтернативам. Представлена процедура поиска оптимального числа потребителей для подключения к существующей тепловой сети, являющаяся обоснованием для увеличения числа существующих потребителей. Проведено тестирование и представлены результаты работы математической модели на примере тестовых тепловых сетей, сконфигурированных на основе ручного ввода основных условий и параметров работы. Определены направления дальнейших исследований по повышению эффективности систем теплоснабжения и интеграции представленной математической модели с современными программными комплексами.         

Supernova search with active learning in ZTF DR3

We provide the first results from the complete SNAD adaptive learning pipeline in the context of a broad scope of data from large-scale astronomical surveys. The main goal of this work is to explore the potential of adaptive learning techniques in application to big data sets. Our SNAD team used Active Anomaly Discovery (AAD) as a tool to search for new supernova (SN) candidates in the photometric data from the first 9.4 months of the Zwicky Transient Facility (ZTF) survey, namely, between March 17 and December 31 2018 (58194 < MJD < 58483). We analysed 70 ZTF fields at a high galactic latitude and visually inspected 2100 outliers. This resulted in 104 SN-like objects being found, 57 of which were reported to the Transient Name Server for the first time and with 47 having previously been mentioned in other catalogues, either as SNe with known types or as SN candidates. We visually inspected the multi-colour light curves of the non-catalogued transients and performed fittings with different supernova models to assign it to a probable photometric class: Ia, Ib/c, IIP, IIL, or IIn. Moreover, we also identified unreported slow-evolving transients that are good superluminous SN candidates, along with a few other non-catalogued objects, such as red dwarf flares and active galactic nuclei. Beyond confirming the effectiveness of human-machine integration underlying the AAD strategy, our results shed light on potential leaks in currently available pipelines. These findings can help avoid similar losses in future large-scale astronomical surveys. Furthermore, the algorithm enables direct searches of any type of data and based on any definition of an anomaly set by the expert.Comment: 22 pages with appendix, 12 figures, 2 tables, accepted for publication in Astronomy and Astrophysic

Transient detections and other real-time data processing from wide-field chambers MASTER-VWF

At present time Robotic observatory making is of current importance. Having a large field of view and being able to point at anywhere, Robotic astronomical systems are indispensable when they looking for transients like grb, supernovae explosions, novae etc, as it's impossible in these cases to foresee what you should point you telescope at and when. In work are described prompt GRB observations received on wide-field chambers MASTER-VWF, and also methods of the images analysis and transients classifications applied in real-time data processing in this experiment. For 7 months of operation 6 synchronous observations of gamma-ray burst had been made by MASTER VWF in Kislovodsk and Irkutsk. In all cases a high upper limits have been received (see tabl \ref {tab_grbwf} and fig. \ref {allgrb}).Comment: 21 pages, 21 figure, 2 tables, Advances in Astronomy in pres