An alternative index to ESP to explain dispersion occurring in Australian soils when Na content is low

Re-use of industrial and agricultural wastewater for irrigation can increase the concentration of potassium in soil and affect soil structure. However, investigations of clay dispersion have traditionally focused on soils with high exchangeable sodium, therefore exchangeable sodium percentage (ESP) has been used to assess soil structural stability. Currently, Australian soils have been considered non-sodic or non-dispersive when the soil ESP <6. However, a few studies have demonstrated that potassium (K) ions in the exchange complex of soil can also assist clay dispersion even when the exchangeable sodium (Na) levels are minimal. The dispersion (as turbidity) and ESP were measured on 74 Australian soils. 17 of those soils showed a considerable level of dispersion, despite ESP <4.5. In all of these soils the Na to K ratio was <1. The relationships between ESP and turbidity were poor (R2= 0.23) indicating limitations of using the ESP for identifying potentially dispersive soils when K is present on the soil exchange sites. Therefore, we used exchangeable cation ratio (ECR), as an index alternative to ESP, but which takes into account effects of exchangeable K on clay dispersion. The good correlation obtained between ECR and the parameters like turbidity and zeta potential support its use in assessing soil structural stability when the appreciable amount of K present on exchange sites

ANALYSIS OF THE CHEMICAL COMPOSITION OF CHAROITE ROCKS

The unique charoite mineralization, established on the Murun alkaline massif in the northwestern part of the Aldan shield on the border of the Irkutsk region and Yakutia, is still of great interest to some of researchers (geologists, crystallographers, geochemists, etc.). The outcrops of charoite-bearing rocks at the “Sirenevyi Kamen” deposit are noted both in the indigenous outcrops and in eluvial clatters [Bondarenko, 2009].The unique charoite mineralization, established on the Murun alkaline massif in the northwestern part of the Aldan shield on the border of the Irkutsk region and Yakutia, is still of great interest to some of researchers (geologists, crystallographers, geochemists, etc.). The outcrops of charoite-bearing rocks at the “Sirenevyi Kamen” deposit are noted both in the indigenous outcrops and in eluvial clatters [Bondarenko, 2009]

Methods for prevention of functional disorders of the kidneys in students

In recent years there has been growth in the number of students who have kidney and urogenital system, in connection with which they are forced to engage in physical culture in special medical group or be exempt from the practical exercises. Proper application of gymnastic exercises in combination with a healthy lifestyle prevents progression of the diseaseВ последние годы наблюдается рост количества студентов, имеющих заболевания почек и мочеполовой системы, в связи, с чем они вынуждены заниматься физической культурой в специальной медицинской группе или быть освобожденными от практических занятий. Правильное применение гимнастических упражнений в сочетании со здоровым образом жизни предупреждает прогрессирование заболевани

Modern information technologies in formation of physical education of the students

The use of information technologies in the study of discipline "Physical culture" will allow to raise interest of students to acquire knowledge and to activate cognitive activity, will contribute to the formation of physical education and cultural competencesИспользование информационных технологий при изучении дисциплины «Физическая культура» позволит повысить интерес у студентов к получению знаний, активизировать познавательную деятельность, будет способствовать формированию физкультурной образованности и общекультурных компетенци

Model of monitoring of physical preparedness of students

Monitoring can be as an information tool of educational process on physical culture and a means of process control applied physical training of students at the universityМониторинг может являться как информационным средством учебного процесса по физической культуре, так и средством управления процессом прикладной физической подготовки студентов в вуз

Quantum Transparency of Barriers for Structure Particles

Penetration of two coupled particles through a repulsive barrier is considered. A simple mechanism of the appearance of barrier resonances is demonstrated that makes the barrier anomalously transparent as compared to the probability of penetration of structureless objects. It is indicated that the probabilities of tunnelling of two interacting particles from a false vacuum can be considerably larger than it was assumed earlier.Comment: Revtex, 4 pages, 4 figure

Переходная кривая зуба эвольвентной передачи с заданной формой

The paper contains a new methodology to set and optimize parameters of easement curve of involute gear tooth. The methodology is based on the principles of generalized parameter method. Shape of easement curve is invariant to tool parameters. Easement curve described by elliptical equation is investigated. The methodology is recommended for optimization of gearing design with improved parameters.Предлагается новая методика для назначения и оптимизации параметров переходной кривой зуба эвольвентной передачи, основанная на принципах метода обобщающих параметров. Форма переходной кривой при этом инвариантна к параметрам инструмента. Исследована переходная кривая, описанная уравнением эллипса. Рекомендуется для оптимизирования конструкций зубчатых передач с улучшенными параметрами

Innovative ways to build skills in students professional and educational institution in athletic activities

В статье представлены общекультурные компетенции выпускника по направлению подготовки «Профессиональное обучение» (по отраслям) и их дескрипторное описание. Предложены образовательные технологии формирования компетенций в процессе физического воспитанияThis paper presents the general cultural competence of the graduate in the field of training Vocational training (by industry) and their description of the descriptor. Proposed educa-tional technology to build skills in physical educatio

Построение и анализ области существования зубчатой передачи в координатах углов профиля при вершине зубьев

The paper proposes a methodology which is recommended for plotting and analysis of involute external gearing (blocking circuit). This methodology is based on the principles of combined parameter method. As the paper states plotting and analysis of existence region in the coordinates of combined parameters αα1,2  (profile angles at tooth points) is more convenient analogue in respect of the coordinates ϑ1,2 . This paper is recommended for optimization of gearing design with improved parameters.Предложена методика построения и анализа области существования (блокирующего контура) эвольвентной зубчатой передачи внешнего зацепления, основанная на принципах метода обобщающих параметров. Построение и анализ области существования в координатах обобщающих параметров αα1,2 (углов профиля при вершине зубьев) является, по мнению автора, более удобным аналогом по отношению к координатам ϑ1,2. Рекомендуется для оптимизирования конструкций зубчатых передач с улучшенными параметрами

New Interstellar Extinction Maps Based on Gaia and Other Sky Surveys

We present new three-dimensional (3D) interstellar extinction maps in the $V$ and Gaia $G$ filters within 2 kpc of the Sun, a 3D differential extinction (dust spatial distribution density) map along the lines of sight in the same space, a 3D map of variations in the ratio of the extinctions in the $V$ and Gaia $G$ filters within 800 pc of the Sun, and a 2D map of total Galactic extinction through the entire dust half-layer from the Sun to extragalactic space for Galactic latitudes $|b|>13^{\circ}$. The 3D maps have a transverse resolution from 3.6 to 11.6 pc and a radial resolution of 50 pc. The 2D map has an angular resolution of 6.1 arcmin. We have produced these maps based on the Gaia DR3 parallaxes and Gaia, Pan-STARRS1, SkyMapper, 2MASS, and WISE photometry for nearly 100 million stars. We have paid special attention to the space within 200 pc of the Sun and high Galactic latitudes as regions where the extinction estimates have had a large relative uncertainty so far. Our maps estimate the extinction within the Galactic dust layer from the Sun to an extended object or through the entire dust half-layer from the Sun to extragalactic space with a precision $\sigma(A_\mathrm{V})=0.06$ mag. This gives a high relative precision of extinction estimates even at high Galactic latitudes, where, according to our estimates, the median total Galactic extinction through the entire dust half-layer from the Sun to extragalactic objects is $A_\mathrm{V}=0.12\pm0.06$ mag. We have shown that the presented maps are among the best ones in data amount, space size, resolution, precision, and other properties.Comment: 15 pages, 4 table