Results of Theoretical Studies to Substantiate the Parameters of Multi-blade Rotary-type Working Bodies

The article presents the results of theoretical studies of the technological process of operation of multi-blade working bodies of rotary type, intended for the distribution of solid organic fertilizers. To determine the length of the blades of the last row of rotors, and accordingly the overall dimensions of the spreader, theoretical dependences of the range of fertilizer particles on the radius of the blades are obtained, which made it possible to determine the size of the blades that provide the required performance of the rotary spreader. Considering the uniform distribution of fertilizer particles over the sieving width, the dependences of the “limiting” zone of loading of the blades (the maximum thickness of the layer of fertilizers captured by one blade) on the angle of their inclination at different lengths of the blades were obtained, which showed that when applying fertilizers with medium and large doses, several rows of blades. Computational experiments were carried out, during which, the number of rows of blades and the ratio of the lengths of the blades of different rows were determined to obtain the smallest unevenness depending on different doses of fertilizer application. As a result of mathematical modeling, the dependences of the working insertion width on the angle of inclination of the blades of the rotor rows relative to the radial position are obtained for various second-time supply of material, using which rational values of the angle of inclination of the blades are found

The association between gambling marketing and unplanned gambling spend: Synthesised findings from two online cross-sectional surveys

Background: In 2020, the British Government initiated a review about whether to introduce stricter controls on gambling marketing. We examine: (i) what proportion of regular sports bettors and emergent adult gamblers report that marketing has prompted unplanned spend; and (ii) what factors are associated with reporting that marketing had prompted unplanned spend. Methods: Data are from two British non-probability online surveys with: (i) emerging adults (16–24 years; n = 3,549; July/August 2019) and (ii) regular sports bettors (18+; n = 3,195; November 2020). Among current gamblers, logistic regressions examined whether reporting that gambling marketing had prompted unplanned spend (vs never) was associated with past-month marketing awareness, past-month receipt of direct marketing (e.g., e-mails), following gambling brands on social media, and problem gambling classification. Results: Almost a third of current gamblers reported that marketing had prompted unplanned gambling spend (sports bettors: 31.2 %; emerging adults: 29.5 %). Escalated severity of problem gambling was associated with reporting that marketing had prompted unplanned spend in both samples, in particular those experiencing gambling problems compared to those experiencing no problems (sports bettors: ORAdj = 17.01, 95 % CI: 10.61–27.27; emerging adults: ORAdj = 11.67, 95 % CI: 6.43–21.12). Receipt of least one form of direct marketing in the past month and following a gambling brand on at least one social media platform was also associated unplanned spend among sports bettors and emerging adults. Conclusion: Among emerging adults and regular sports bettors, increased severity of gambling problems, receiving direct marketing, and following gambling brands on social media are associated with reporting that marketing has prompted unplanned spend

2D Molybdenum Carbide MXenes for Enhanced Selective Detection of Humidity in Air

2D transition metal carbides and nitrides (MXenes) open up novel opportunities in gas sensing with high sensitivity at room temperature. Herein, 2D Mo2CTx flakes with high aspect ratio are successfully synthesized. The chemiresistive effect in a sub-mu m MXene multilayer for different organic vapors and humidity at 10(1)-10(4) ppm in dry air is studied. Reasonably, the low-noise resistance signal allows the detection of H2O down to 10 ppm. Moreover, humidity suppresses the response of Mo2CTx to organic analytes due to the blocking of adsorption active sites. By measuring the impedance of MXene layers as a function of ac frequency in the 10(-2)-10(6) Hz range, it is shown that operation principle of the sensor is dominated by resistance change rather than capacitance variations. The sensor transfer function allows to conclude that the Mo2CTx chemiresistance is mainly originating from electron transport through interflake potential barriers with heights up to 0.2 eV. Density functional theory calculations, elucidating the Mo2C surface interaction with organic analytes and H2O, explain the experimental data as an energy shift of the density of states under the analyte's adsorption which induces increasing electrical resistance

Dosimetry for boron neutron capture therapy developed and verified at the accelerator based neutron source VITA

The method of boron neutron capture therapy for malignant tumors, proposed in 1936, is beginning to enter clinical practice. The development of dosimetry tools for characterization of therapeutic mixed neutron-photon beam and assessing the patient’s response to treatment is becoming relevant. In this work, a number of dosimetric techniques have been developed: a compact neutron detector with a pair of cast scintillators, one of which is enriched with boron, to measure the boron dose and the γ-ray dose; cell dosimeter for measuring the sum of the equivalent dose of fast neutrons and the equivalent nitrogen dose; prompt γ-ray spectroscopy for in situ measurement of boron dose in real time; epithermal neutron flux monitor for measuring the epithermal neutron flux. Their verification carried out on the accelerator based neutron source VITA showed that they can become convenient and reliable tools for characterization of neutron beam and assessing the patient’s response to treatment

Two-particle correlations in azimuthal angle and pseudorapidity in inelastic p + p interactions at the CERN Super Proton Synchrotron

Results on two-particle ΔηΔϕ correlations in inelastic p + p interactions at 20, 31, 40, 80, and 158 GeV/c are presented. The measurements were performed using the large acceptance NA61/SHINE hadron spectrometer at the CERN Super Proton Synchrotron. The data show structures which can be attributed mainly to effects of resonance decays, momentum conservation, and quantum statistics. The results are compared with the Epos and UrQMD models.ISSN:1434-6044ISSN:1434-605

Using a DBMS based on various data models in solving problems of cartography and geoinformatics

An increasing number of database management systems are expanding their functionality to work with various types of spatial data. This is true for both relational and NoSQL data models. The article describes the main features of those data models for which the functions of storing and processing spatial data are implemented. A comparative analysis of the performance of typical spatial queries for database management systems based on various data models, including multi-model ones, is carried out. The dataset on which the comparison is performed is presented in the form of three blocks of OpenStreetMap vector data for the territory of the Novosibirsk region. Based on the results of the study, recommendations are made on the use of certain data models, depending on the available data and the tasks to be solved