Evidence for the production of Ar2∗−_2^{*-} metastable negative molecular ions in two-phase argon detectors for dark matter searches

The recent studies of electroluminescence (EL) properties in two-phase argon detectors for dark matter searches have revealed the presence of unusual delayed pulses in the EL signal in the form of two slow components with time constants of about 5 and 50 $\mu$s. These components were shown to be present in the charge signal itself, which clearly indicates that drifting electrons are temporarily trapped on two states of metastable negative argon ions which have never been observed before. In this work, using the pressure dependence of the ratio of slow component contributions measured in experiment, it is shown that these states are those of two types of metastable negative molecular ions, $\mathrm{Ar}_2^{*-}(b \ ^4\Sigma_u^-)$ and $\mathrm{Ar}_2^{*-}(a \ ^4\Sigma_g^+)$ for the higher and lower energy level respectively.Comment: 4 pages, 2 figure

Effect of nitrogenous bases on the thermal stability of jet fuels

Fuels from naphthenic petroleums were evaluated, and it was found that they had more N bases than those paraffinic ones (0.00024 and 0.000009% N, respectively). The removal of the N bases improved significantly the thermal stability and reduced the residue formation during oxidation of the fuel. The improvement depended on both content and composition of the bases. Thus, fuels with similar content of N bases (0.00058% N) and thermal stability had oxidation residues of 17.5 and 5.6 and sol. gum of 13 and 1.5 mg/100 ml, before and after removing the N bases, respectively

STUDY OF COLCHICINE EFFECTS ON ELECTROCONVULSIVE EPILEPTIC EQUIVALENT IN RATS

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PROSPECTS FOR THE DEVELOPMENT OF THE EDUCATIONAL ENVIRONMENT: RESULTS AND GUIDELINES OF A QUESTIONNAIRE SURVEY OF TEACHING STAFF AT THE UNIVERSITY

The analysis of the results of a questionnaire survey of heads of institutes, departments and members of Academic board of the State University of Management on a set of issues related to goal-setting in teaching managerial personnel has been presented. It has been revealed, on the one hand, a variety of respondents ‘ points of view, on the other hand, the presence of a sufficiently high degree of unanimity in goal-setting and ways of exit of the University to the trajectory of effective development. It has been concluded, that it is necessary to take serious measures to improve the quality of higher education using, first of all, rich domestic experience and strategic guidelines in the socio-economic development of the country

Methodical recommendation to "Basics of software engineering. Laboratory practice". Part 1

Software engineering is an engineering discipline that is concerned with all aspects of software production. Software engineering can be divided into sub-disciplines. Some of them are: - Software engineering management: The application of management activities – planning, coordinating, measuring, monitoring, controlling, and reporting – to ensure that the development and maintenance of software is systematic, disciplined, and quantified. Requirements engineering: The elicitation, analysis, specification, and validation of requirements for software