A superconducting undulator created at the Budker Institute of Nuclear Physics with a period of 15.6 mm and a field of 1.2 T is tested in own undulator cryostat based on indirect cooling with zero ...helium consumption. The main characteristics and design features of the magnetic and cryogenic systems of this insertion device are presented. Results from measuring the magnetic field are presented. Features of the operation of a cryogenic system in different modes are discussed.
Based on the analysis of physical regularities of changes in hydrodynamics of a system of composition of layered components in a dense blown layer, the regularities of development of pressure changes ...in the flow of a pulsating blast with a given frequency of pulsations are established. The main regularities of pressure change in the pulsator as well as in the targeted object of periodic oscillations of gas flow supply are theoretically determined. The features of the change in the force effects of the pulsating flow are shown as the sum of intermediate time effects, which are capable of providing an increase in the rate of filtration of gases through the layer packing while reducing its gas-dynamic resistance.
The results of studies are presented for the influence of hydrodynamic factors on the occurrence of nitric thermal waters in crystalline massifs based on the example of the Kuldur field. The results ...of two-dimensional modeling based on the FEFLOW software are considered for several versions of the formation and circulation of thermal waters in the treated area. The modeling parameters included temperature within 130–140°C calculated on the basis of geothermometers, as well as the residence time of the waters in the rock massif (68 000–254 000 years) evaluated by
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C- and
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He-dating. The modeling results show that the filtration parameters of the granite massif are the main factors that control the fluid motion dynamics and, hence, the relative age of thermal waters. It was also found that the filtration characteristics of the fault zone considerably affect the discharge temperature of thermal waters.
An unfavorable external environment requires an emphasis shift in economic researches of enterprise development from factors and mechanisms of growth to the analysis of stagnation processes and the ...search for mechanisms to enter the path of growth after stagnation. The purpose of this work is to study the intensity of the processes of stagnation and subsequent renewable growth of enterprises in the context of a wide range of sectors of the Russian economy. Signs of stagnation or drop in sales are revealed for 2013–2017, renewable growth – within 4 years after the stagnation period. The research methods are the calculation of economic coefficients and the identification of differences between them using methods of mathematical statistics. It was found that in an unfavorable external environment, significant proportion of Russian enterprises showed signs of stagnation or drop in sales. Certain advantages are shown by high-tech industries, in which the intensity of business stagnation was lower. The most acute period of the crisis was the period 2013–2016. In 2017, there was an adaptation of business to unfavorable environmental conditions, and the share of stagnating enterprises decreased significantly. Calculations showed that the share of enterprises demonstrating long-term renewable growth was at a low level. It reduces their attractiveness to private investors. The “age” factor can be recommended as a significant criterion for investors when choosing firms for financing: young enterprises are less susceptible to stagnation and more likely to enter the path of growth after stagnation.
The problem of autonomous determination using primary and/or secondary data of a strapdown inertial navigation system of two events is considered: the beginning and end of the movement of an object, ...and, as a consequence, determining the intervals of the immobility of the object. The task makes sense for airfield-based objects, when there are no other motion sensors, and also when the object can stop for an indefinite time when the object is taxiing along the airfield’s lanes. Detection of immobility intervals allows applying a zero velocity correction of the strapdown inertial navigation system or ZUPT-correction (Zero velocity UPdaTe), which is important for the subsequent functioning of the strapdown inertial navigation system. Two approaches to the construction of algorithms for detecting the start and stopping of the movement of an object are described. The first is based on the use of the primary information of a strapdown inertial navigation system, i.e., the readings of inertial sensors (accelerometers, angular velocity sensors); and the second, on the use of secondary information (positional, speed, angular data of the autonomous inertial calculation). Both approaches are based on heuristic criteria obtained empirically when processing data from strapdown inertial navigation systems and taking into account the specifics of the problem. The results of testing the developed algorithms on the experimental data for strapdown inertial navigation systems (SINS) of the navigation accuracy class are presented.
We present a measurement of the pion form factor based on e+e− annihilation data from the CMD-2 detector in the energy range 0.6<s<1.0 GeV with a systematic uncertainty of 0.8%. A data sample is five ...times larger than that used in our previous measurement.
We have reported on the results of an experimental investigation of the effect of inert admixtures on the threshold characteristics of the breakdown (initiation) voltage in energy-saturated ...materials. A physicomathematical model that describes the experimental results has been proposed.
The results of experiments on laser initiation of explosive transformations in energy-saturated composites based on nanoporous silicon have been presented. Calcium perchlorate has been used as an ...oxidizer. It has been shown that the additive of graphene-like powder material (20–30) wt % in the energy-saturated composite increases its sensitivity to infrared laser radiation and excites rapid exothermic reactions in it.
Superconducting multipole insertion devices (wigglers and undulators) used to generate synchrotron radiation significantly increase the photon flux, especially in the hard spectral region. Over the ...past 35 years, more than 25 superconducting wigglers for leading centers of synchrotron radiation have been created at the BINP. A cryogenic system based on cryocoolers has been developed, which makes is possible to operate superconducting insertion devices for several years without consuming liquid helium. In this paper, the characteristics of various superconducting insertion devices created at the BINP are presented. The design features and recent advances in the development of the magnetic and cryogenic system with liquid and indirect cooling are discussed.
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