Geotechnical Parameters for Explotation Hydrogenous Uranium Deposits in Mongolia

The parameters of the opening for explotation hydrogenic uranium deposits in Mongolia and recommendations on the technology for their development

Numerical modelling of massif zonal structuring around underground working

Purpose. To identify indicators of massif zonal structuring around underground working using numerical modeling techniques. Methods. Research into massif zonal structuring was performed using finite element method and thermodynamic method by which the size and number of zones formed around development workings and stopes have been simulated. Findings. The ratio of zones’ vertical and horizontal semiaxes in the massif has been established and reliability of the obtained results was determined. The prospects of new modeling techniques for the study of massif zonal structuring parameters around underground workings have been identified. Originality. The opportunities for wide application of numerical simulation methods to study the phenomenon of zonal encapsulation by the massif of underground workings have been revealed. Practical implications. The sizes and shapes of zones in the massif around workings were determined and requirements were formulated stating that synergetic research methods should allow to more accurately determine the number, size and shape of zones, as well as fading sinusoidal stress and massif strain domains.Цель. Выявить показатели зонального структурирования массива вокруг подземных выработок с помощью численных методов моделирования. Методика. Исследование зонального структурирования массива выполнялось методом конечных элементов и термодинамическим методом, с помощью которых смоделированы размеры и количество зон, формирующихся вокруг подготовительных и очистных выработок. Результаты. Установлено отношение вертикальных и горизонтальных полуосей зон в массиве и определена достоверность полученных результатов. Раскрыты перспективы создания новых методов моделирования для исследования параметров зонального структурирования массива вокруг подземных выработок. Научная новизна. Раскрыты возможности широко применяемых численных методов моделирования для исследования феномена зонального капсулирования массивом подземных выработок. Практическая значимость. Установлены размеры и форма зон в массиве вокруг выработок и определены требования к синергетическим методам исследования, заключающиеся в возможностях более точного определения количества, размеров и формы зон, а также синусоидально-затухающих напряжений и кольцевых областей деформаций массива.Мета. Виявити показники зонального структурування масиву навколо підземних виробок за допомогою чисельних методів моделювання. Методика. Дослідження зонального структурування масиву виконувалося методом кінцевих елементів і термодинамічним методом, за допомогою яких змодельовані розміри та кількість зон, які формуються навколо підготовчих й очисних виробок. Результати. Встановлено відношення вертикальних і горизонтальних напіввісей зон у масиві та визначена достовірність отриманих результатів. Розкрито перспективи створення нових методів моделювання для дослідження параметрів зонального структурування масиву навколо підземних виробок. Наукова новизна. Розкрито можливості широко застосованих чисельних методів моделювання для дослідження феномена зонального капсулювання масивом підземних виробок. Практична значимість. Встановлено розміри і форму зон у масиві навколо виробок та визначено вимоги до синергетичних методів дослідження, що полягають у можливості більш точного визначення кількості, розмірів і форми зон, а також синусоїдально-згасаючих напружень та кільцевих областей деформацій масиву.За предоставленные материалы и оказанную поддержку при проведении теоретических исследований с помощью термодинамического метода авторы выражают благодарность заведующему кафедры подземной разработки месторождений полезных ископаемых Государственного ВУЗ “Криворожский национальный университет” В.А. Калиниченку

LEACHING OF URANIUM DEPOSITS IN MONGOLIA

The paper outlines the results of field, laboratory, and theoretical studies on geotechnical parameters of uranium in-situ leaching (ISL) for hydrogenous deposits located in eastern Mongolia. The field and laboratory studies included drilling, geophysical surveying, testing and evaluation of mechanical and flow properties of uranium-bearing rocks, and evaluation of chemical composition

Structural Analysis of Opinion Essays by Second-year EFL Teacher Training Students

This study examines the structural analysis of opinion essays written by second-year EFL teacher training students. In an era where written communication in second languages (L2) is indispensable across various fields, the demand for writing skills has become increasingly central to school and university curricula. Among different types of academic essays, mastering the genre of opinion essays is essential for students. This study assesses how effectively second-year EFL teacher-training students have learned to write opinion essays. Following a qualitative approach, opinion essays written by 40 undergraduate students were analyzed. The findings indicate that most students could effectively structure their opinion essays according to the prescribed format. Students successfully provided general statements followed by a thesis statement in the introduction, developed well-structured body paragraphs with clear topic sentences and supporting details, and offered practical conclusions. The study highlights the importance of teaching academic writing skills and provides educators with insights on effectively teaching opinion essay writing to EFL students. This research contributes to understanding how second-year EFL teachers train students to develop their skills in writing opinion essays. The findings underscore the importance of structured academic writing instruction and offer valuable insights for educators seeking to enhance the teaching of opinion essay writing to EFL students. Англи хэлний багшийн 2-р ангийн оюутнуудын үзэл бодлоо илэрхийлсэн эссэний бүтцэд хийсэн дүн шинжилгээ Хураангуй: Оюутнууд үзэл бодлоо илэрхийлсэн эссэг бичиж сурах нь зайлшгүй байна. Тус судалгаа нь Англи хэлний багшийн 2-р ангийн оюутнууд үзэл бодлоо илэрхийлсэн эссэг бүтцийн дагуу хэр үр дүнтэй бичиж сурч байгааг үнэлэх зорилготой. Тус судалгаа нь эссэнд бүтцийн анализ хийх чанарын аргыг ашиглаж англи хэлний багшийн 2-р ангийн 40 оюутны 70 эссэнд бүтцийн дүн шинжилгээ хийж үзэхэд ихэнх оюутнууд (70%) бүтцийн дагуу үзэл бодлоо илэрхийлсэн эссэг бичиж сурсан байна. Тус судалгаанд цөөн тооны жишээ эссэг харуулсан. Дийлэнх оюутнууд эссэний удиртгал цогцолборт сэдвийн талаарх ерөнхий мэдээлэл, гол санаа агуулсан мэдээллийг хангалттай үнэлгээтэй гаргасан байна. Мөн дэлгэрүүлэгч цогцолборт хөтөч санаа түүнийг дэмжсэн жишээ өгүүлбэрүүдийг мөн хангалттай үнэлгээтэй бичсэн байна. Дүгнэлт өгүүлбэрийг мөн заасны дагуу 2 аргаар бичиж сурсан байна. Үүнд гол санааг өөрийн үгээр илэрхийлж бичихээс гадна хөтөч санааг дурдаж бичсэн байна.     Түлхүүр үг: удиртгал цогцолбор, дэлгэрүүлэгч цогцолбор, дүгнэлт цогцолбо

Climate change reduces extent of temperate drylands and intensifies drought in deep soils

Drylands cover 40% of the global terrestrial surface and provide important ecosystem services. While drylands as a whole are expected to increase in extent and aridity in coming decades, temperature and precipitation forecasts vary by latitude and geographic region suggesting different trajectories for tropical, subtropical, and temperate drylands. Uncertainty in the future of tropical and subtropical drylands is well constrained, whereas soil moisture and ecological droughts, which drive vegetation productivity and composition, remain poorly understood in temperate drylands. Here we show that, over the twenty first century, temperate drylands may contract by a third, primarily converting to subtropical drylands, and that deep soil layers could be increasingly dry during the growing season. These changes imply major shifts in vegetation and ecosystem service delivery. Our results illustrate the importance of appropriate drought measures and, as a global study that focuses on temperate drylands, highlight a distinct fate for these highly populated areas

Further investigation of natural resources and economic growth : Do natural resources depress economic growth?

One of the surprising findings in the economic development literature is that natural resource-rich countries tend to have slower economic growth than resource-poor countries, i.e., the natural resource curse and Dutch disease. In this paper, we revisit these issues by applying quantile regression and using the most updated data. The results demonstrate that resource-intensive countries in 1970 suffered from slower economic growth than resource-poor countries over the next 20 years, consistent with Sachs and Warner (1995, 1997, 2001). However, contrary to initial expectation, we find that natural resource abundance in 1990 had positive impacts on economic growth between 1990 and 2010. We further test the Dutch disease theory, and the result contradicts the hypothesis. Overall, our analysis suggests that in the period from 1970 to 1990, the hypotheses of a resource curse and Dutch disease hold. However, in the period from 1990 to 2010, these hypotheses no longer hold because manufacturing sectors have grown suffciently even in resource-rich countries.departmental bulletin pape

Effects of strength training on body structure and muscle development in female basketball players: A case study of the NUM "falcons" team

This study aimed to evaluate the effects of a structured strength training program on body structure and muscle development in female basketball players, using the NUM\u27s "Falcons" team as a case study. The study was conducted with 13 female athletes from the Shonkhoruud (Falcons), the women\u27s basketball team of the National University of Mongolia (NUM). Over a four-month period, the athletes followed a structured strength training program that incorporated both general and functional exercises using bodyweight and external resistance. Anthropometric data related to body structure and muscle mass were collected using 13 specific indicators at three period points: baseline (0 months), mid-point (2 months), and post-intervention (4 months). The data were analyzed using Repeated Measures ANOVA to identify statistically significant changes over time. The analysis revealed statistically significant changes in several anthropometric indicators. Specifically, the shoulder circumference increased by 1.6 cm, the upper arm circumference by 1.3 cm, and the waist circumference decreased by an average of 2.9 cm (p<0.05). These findings demonstrate that a structured strength training program can significantly enhance muscle development and improve body composition and structure in female basketball players. The study supports the inclusion of targeted strength training as an effective component of athletic development for female athletes

Charakterisierung von Dentinoberflächennach Bearbeitung mit neuen, minimal-invasiven und selbstlimitierenden Präparationsverfahren

Ziel meine Arbeit war drei Methoden (Carisolv, Smartprep und Biosolv) zu vergleichen und zu überprüfen, ob es möglich ist, einen belastungsstabilen Verbund zu der so behandelten Dentinoberfläche zu etablieren. Für die Untersuchungen wurden extrahierte Zähne mit natürlicher Karies verwendet. Hier wurde entwickelt eine Methode, eine Kavität für unterschiedliche Behandlungsmethoden verwenden zu können. Die Zähne wurden in 200 µm dicke Scheiben geschnitten. Auf diese Weise wurden bis zu 10 Schnitte pro Zahn gewonnen. Die Zahnschnitte wurden stabilisiert mit Objektträgern und behandelt die Karies mit den unterschiedlichen Methoden. Das treffende Problem war eine Methode zu finden, den therapeutischen Endpunkt zu bestimmen, ohne auf die Härte der Oberfläche zurückzugreifen. Dafür wurde die Autofluoreszenz verwendet. Hier konnte mit Hilfe eines Stereo-Mikroskopes mit Fluoreszenzaufsatz die Restdicke des Zahndefektes bei zwei unterschiedlichen Wellenlängen bestimmen (FITC, TexasRED). Es wurde weiterer Untersuchungen durchgeführt (Mikrohärte, Mikrozugversuch und Rasterelektronenmikroskopie). Es wurde folgende Ergebnisse erreicht. Mithilfe der Fluoreszenzmessung konnte belegt werden, dass die neuen selbstlimitierenden Kariestherapieansätze bis zu 0.9 mm Zahnhartsubstanz belassen, die anhand von Fluorophoreinlagerungen als kariöse änderte betrachtet werden muss. Es wurde in die Untersuchung kein Vergleich zu rotierenden Stahlinstrumenten („Rosenbohrer“) aufgenommen, da Stahlinstrumente beliebig weit in gesundes Dentin schneiden können und man auf diese Weise primär den Behandlereinfluss untersucht hätte. Im Vergleich zu gesundem Dentin betrug die Härte direkt unter der Defektoberfläche zwischen 40 und 60%, was einen indirekten Beweis für substanzschonendes Vorgehen darstellt. Anhand der Mikrozugversuchsergebnisse kann man feststellen, dass die selbstlimitierende Kariestherapie mit spezifischer (Enzyme) und unspezifischer Kollagenspaltung (Natriumhypochlorit) geringere Haftwerte als gesundes Dentin aufweisen. Zu dem Produkt Carisolv liegen jedoch zahlreiche klinische Studien vor, bei denen die Dentinhaftung klinisch ausreichend war. Aufgrund dieser Daten kann man ableiten, dass auch für Biosolv eine hohe Wahrscheinlichkeit besteht, klinisch erfolgreich eingesetzt werden zu können. Die Ergebnisse waren für das Konzept der selbstlimitierenden Kariestherapie insgesamt positiv. Die Ergebnisse haben aber auch gezeigt, dass die konventionelle Bestimmung des therapeutischen Endpunktes mithilfe der zahnärztlichen Sonde bei diesem Verfahren nicht mehr möglich sein wird. Bevor die selbstlimitierende Kariestherapie Einzug in die Praxis finden wird muss somit das Problem der Kontrolle gelöst werden, ob ausreichende Beseitigung des infizierten Gewebes vorliegt

Detection of acoustic wave generated by Baganuur mining explosion

We analyzed all available recorded infrasound data and determined the station detection capability in Mongolia. While in the winter times, we continuously detect acoustic signals from blasts at the Baganuur open-pit mine (150 km from infrasound I34MN station), which we rarely registered during the summer times. A previous study has shown that the noise level increased by 5 dB - 10 dB in the summer, which affected the detection capability of the stations. On the other hand, this could be connected to infrasound propagation model difference between winter and summer times. To verify this phenomenon, we installed a new infrasound IBHM station in a forest area at a distance of 350 km from the Baganuur mine area. When we compared the background noise level of the two stations, the noise level at the temporary station was lower than the permanent one, which allowed us to compare winter and summer time registered infra wave characteristics. With the comparison observed and modeled, apparent velocity suggested that winter and summer time detection difference could be due to the propagation model of infrasound wave itself