59 research outputs found

    Svetloe Radio Astronomical Observatory

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    This report summarizes information about the Svetloe Radio Astronomical Observatory activities in 2012. Last year, a number of changes took place in the observatory to improve some technical characteristics and to upgrade some units to their required status. The report provides an overview of current geodetic VLBI activities and gives an outlook for the future

    Badary Radio Astronomical Observatory

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    This report provides information about the Badary network station: general information, facilities, staff, present status, and outlook

    Zelenchukskaya Radio Astronomical Observatory

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    This report summarizes information about Zelenchukskaya Radio Astronomical Observatory activities in 2012. Last year a number of changes took place in the observatory to improve some technical characteristics and to upgrade some units to the required status. The report provides an overview of current geodetic VLBI activities and gives an outlook for the future

    Assessment of the situation of convergence of ships at sea on the basis of COLREG

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    The problem of estimating the navigational situation in case of convergent ships at sea is considered. The algorithm of estimation of a situation of approach of ships according to COLREG is offered with use of the information on mutual positioning and elements of movement of ships. An algorithm for determining the mutual responsibilities of ships on the basis of information on the navigational status of ships obtained by AIS, and the situation of their convergence is proposed. The complex estimation of situation in a group of ships is offered in the form of a full connected directed graph of situations defining the degree of danger and mutual obligations according to COLREG of each of the ships in this group

    Microprocessor temperature control device for a thermal object

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    The article deals with a device for temperature control of a thermal object. The device is based on a single-chip AVR ATmega32 microcontroller. There are two modes of temperature regulation. The first is designed for temperature regulation within the range of -55 ° C to +125 ° C, and the second is from +126 ° C to +1000 ° C. The first range uses a DS18B20 digital serial output temperature sensor. The temperature measurement resolution in the first temperature range of -55 °C to +125 °C is 0.0625 °C. The second range uses a K-type thermocouple and a MAX6675 thermocouple signal converter with I2C interface. The discreteness of temperature measurement in the range from +126 C to +1000 C is 2 C. The microprocessor based controller has a very wide temperature control range from -55 to +1000°C, which is well within the temperature range required by the process. In the first area, due to high accuracy digital temperature sensor DS18B20, the resolution is very good ±0.0625 °C, which enables the use of the controller in climate control systems

    The problem of cooperative divergence of uncrewed vessels

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    The article deals with the problem of preventing ship collisions while at sea. When crewless ships meet at sea, it is necessary to ensure their safe separation. A formalization of setting the problem of safe divergence of a group of ships is given. Vessel subsets in various states in a group of ships are determined, and ship transitions from one state to another are described. The problem of a lack of mutual understanding between agents controlling unaccompanied ships is considered. A counter vessel may not perform the divergence manoeuvres that the agent controlling the uncrewed vessel expects. An analysis is made of the reasons contributing to this. The problem of detection of inadequate behaviour of a counter vessel or its violation of manoeuvring arrangements is offered. The criteria for detecting such behaviour and agent's actions to prevent collision in this case are considered

    New NIR-emissive tetranuclear Er(III) complexes with 4-hydroxo-2,1,3-benzothiadiazolate and dibenzoylmethanate ligands: synthesis and characterization

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    New tetranuclear heteroleptic complexes [Er4(dbm)6(O-btd)4(OH)2] (1) and [Er4(dbm)4(O-btd)6(OH)2] (2) (O-btd = 4-hydroxo-2,1,3-benzothiadiazolate and dbm = dibenzoylmethanide) and their solvates with toluene, THF and CH2Cl2 were prepared using two synthetic approaches. The structures of the products were confirmed by single-crystal X-ray diffraction. Magnetic properties of 1 and 2 are in good agreement with X-ray data. The effective magnetic moment (μeff) values at 300 K for 1 and 2 corresponds to a system of 4 non-interacting Er(III) ions in the ground state 4J15/2 with g = 6/5. At ambient temperature and upon excitation with λexc = 450 nm, complexes 1 and 2 exhibit luminescence at ∼1530 nm, i.e. in the near infra-red (NIR) region. The luminescence intensity grows with increasing the number of the (O-btd)−ligands in the complexes. This observation suggests (O-btd)− as a new efficient antenna ligand for the lanthanide-based NIR luminescence

    Evaluation of the quality and safety of cows' milk when using the mineral elements

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    A successful feeding program should solve the following problems: achieving planned milk production, increasing dry matter intake and improving ruminal microbiota. As an integral part of the diet, feed additives have an impact on the animal's body, which is expressed, for example, in an increase in average daily weight gain, a decrease in conversion, an improvement in metabolic metabolism and so on. However, it should be noted that feed additives alone do not guarantee of high productivity or profitability of milk production. The purpose of these studies was to evaluate the effect of the multicomponent feed additive Felucen on the sanitary quality and safety of cows' milk. The studies were conducted on the basis of training and experimental farm, where two groups of dairy cows, 40 heads each, were formed according to the principle of analogues. All cows of both groups received the basic diet accepted on the farm. Additionally, the first group received Felucen feed additive at the rate of 5 g per 1 kg of body. Analysis of the milk composition and productivity was carried out on the 10th, 30th, 60th and 90th day. The use of Felucen provided an increase in the milk productivity of cows by 11% and an increase in the quality indicators of milk: the mass fraction of fat increased by 0.11%, protein - by 0.21%, lactose - by 0.20%
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