Год выпуска: 2022
Издательство: Детгиз
Год выпуска: 1950
Серия, номер выпуска: Естественно-научная библиотечка школьника
Количество страниц: 84 с.
Количество страниц: 15 с.
- 1. Сукнев Сергей Викторович. Влияние условий водонасыщения на прочность карбонатных пород при сжатии = Influence of water saturation conditions on the compressive strength of carbonate rocks
- 2. Андреева Сахая Николаевна. Стратегии жизни плотнодерновинных злаков Festuca lenensis Drob. и Koeleria cristata (L.) Pers. в степных сообществах Центральной Якутии = The life strategies of firm-bunch grasses Festuca lenensis Drob. and Koeleria cristata (L.) Pers. in the steppe communities of Central Yakutia
- 3. Рожина Сахаяна Михайловна, Местникова Анна Александровна, Cлепцов Игорь Витальевич. Хемотаксономические исследования деревьев рода Larix на территории Центральной Якутии = Chemotaxonomic investigations of Larix species in Central Yakutia
- 4. Боескоров Василий Степанович, Саввинов Григорий Николаевич. Ископаемые остатки мезофауны четвертичного периода Янского плато как индикаторы палеоландшафтных условий позднего плейстоцена = Fossil specimens of the mesofauna from the Quaternary period of the Yana Plateau as indicators of the paleolandscape conditions during the late Pleistocene
- 5. Жуков Михаил Андреевич. Вопросы реализации Национального проекта "Биоэкономика" в Арктической зоне Российской Федерации = Issues with implementation regarding the National Project “Bioeconomics” in the Arctic zone of the Russian Federation
- 6. Кершенгольц Борис Моисеевич. Национальный проект России "Биоэкономика" на Северо-Востоке Евразии: биопрепараты из тканей холодоадаптированных дикоросов и аборигенных видов животных = National project of Russia “Bioeconomics” in the North-East of Eurasia: biopreparations from tissues of cold-adapted wild plants and native animal species
- 7. Васильев Андрей Петрович, Охлопкова Айталина Алексеевна, Стручкова Татьяна Семеновна, Алексеев Алексей Гаврильевич. Влияние механохимической активации диоксида церия на структуру и свойства политетрафторэтилена = Effect of mechanochemical activation of cerium dioxide on the structure and properties of polytetrafluoroethylene
- 8. Ксю Мингсян, Гоголева Ольга Владимировна, Соколова Марина Дмитриевна, Петрова Павлина Николаевна, Федоров Андрей Леонидович, Кондаков Михаил Николаевич, Чжан Дайфен. Исследование изменения свойств СВМПЭ в натурных условиях г. Якутск в зависимости от сезона экспонирования = Study of the changes in the properties of UHMWPE under the natural environmental conditions of Yakutsk based on seasonal exposure
- 9. Природные ресурсы Арктики и Субарктики = Arctic and Subarctic natural resources, 2025, №2 (Т. 30)
The study reports on the application of machine learning methods for predicting gold mineralization in the prospecting phase of geological exploration. It focuses on the Verkhneamginsky alkaline massif, situated within the Aldan-Stanovoy Shield, as a case study. The investigation included the analysis of 403 ore samples, which were evaluated through Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES) to determine the concentrations of 25 chemical elements. A total of eight classification algorithms were assessed in this investigation, including Random Forest, Support Vector Machine, Neural Network (Multilayer Perceptron), Boosting (AdaBoost), Decision Tree, K-Nearest Neighbors, Linear Discriminant Analysis, and Naive Bayes. The Random Forest and Support Vector Machine algorithms demonstrated the highest accuracy, achieving 89.6%, by identifying the relationships among ore elements (Au,Ag, As, Cu, Sb) and those elements that displayed negative correlations (Mg, Ca, Ti). These results were further validated through Receiver Operating Characteristic (ROC) analysis. In the process of developing the machine learning model, the values corresponding to the “ore” factor for each sample were designated as the target variable, while serving as predictors. To enable a comparative analysis between the parameters of established entities and the predicted regions, anomalous fields of the “ore” factor values were constructed. Additionally, machine learning methods enable the rapid and reliable interpretation of virtually any geochemical analytical data in the field, including data obtained through modern spectrometry methods and portable X-ray fluorescence (XRF) analyzers. The research further underscores the significance of integrating traditional statistical approaches, such as cluster and factor analysis,with contemporary machine learning algorithms to improve the accuracy of predictions.
Чудинов, П. Л.
Применение алгоритмов машинного обучения для прогнозирования золоторудной минерализации Верхнеамгинского щелочного массива, Алдано-Становой щит / П. Л. Чудинов, В. Ю. Фридовский ; АО "Полюс Алдан", Институт геологии алмаза и благородных металлов СО РАН // Природные ресурсы Арктики и Субарктики. - 2025. - N 2, Т. 30. - С. 205-219. - DOI: 10.31242/2618-9712-2025-30-2-205-219
DOI: 10.31242/2618-9712-2025-30-2-205-219
Год выпуска: 2020
Количество страниц: 2 с.
Шепелев, В. В.
Памяти Марка Михайловича Шаца / В. В. Шепелев, Ю. В. Шумилов, И. И. Сыромятников // Наука и техника в Якутии. - 2024. - N 2 (47). - C. 115-116. - DOI: 10.24412/1728-516Х-2024-2-115-116
DOI: 10.24412/1728-516Х-2024-2-115-116
Год выпуска: 2025
Количество страниц: 10 с.
Currently, about 45% of the population of the Republic of Sakha (Yakutia) lives in the valley of the middle reaches of the Lena River. The effects of climate change to varying degrees can have both negative and positive impacts on the lives of these people. The purpose of this article: to identify the features of changes in air temperature and precipitation regime in the study area. The paper uses methods of statistical analysis and scientific generalization. Meteorological series of three stations located in the valley of the middle reaches of the Lena River – Namtsy, Yakutsk and Pokrovsk – were analyzed. The air temperature is taken for the period 1961-2024, which covers the old base period 1961-1990 and the current climatic norm 1991-2020. The series of atmospheric precipitation were analyzed for the period 1966-2024. To simplify the task, the period from May to September was taken for the warm period, and the period from October to April for the cold period. Statistically significant trends in annual air temperature were revealed, the rate of change in Pokrovsk is 0.4 ° C/10 years, in Yakutsk and Namtsy 0.6 ° C/10 years. The sums of the daily temperatures of the warm period increased significantly. Analysis of precipitation did not find statistically significant trends; graphical visualization of their dynamics provides insight into significant year-to-year variability. At all stations since 2014, there has been a decrease in the amount of precipitation of the warm period, and in the last 5 years – an increase in the amount of precipitation of the cold period. The results obtained can be used when adopting plans for regional adaptation measures in the Republic of Sakha (Yakutia), in particular, for its central, most populated part.
Петрова, А. Н.
Региональные изменения температуры воздуха и атмосферных осадков в среднем течении реки Лены / А. Н. Петрова ; Институт мерзлотоведения им. П. И. Мельникова // Вестник Северо-Восточного федерального университета им. М. К. Аммосова. Серия "Науки о Земле". - 2025. - N 3 (39). - С. 78-87. - DOI: 10.25587/2587-8751-2025-1-78-87
DOI: 10.25587/2587-8751-2025-1-78-87
Количество страниц: 11 с.
In recent years, forest fires have demonstrated an increasing trend in Yakutia, associated with modern global warming and extensive activation of cryogenic processes. In Central Yakutia, an ice complex is widespread, confined to the inter-alas type of terrain. Thawing of the ice component of the soils leads to the development of thermokarst, which is observed in disturbed treeless areas. The general climatic conditions, lithological and geocryological characteristics of the areas for which numerical modeling of the thermal state of soils was performed are described. The thermal state of inter-alas soils in 8 areas after forest fires was modeled during vegetation restoration, taking into account the current trend of increasing air temperature by 0.02о/year. The models were compiled for key periods of change in surface conditions and vegetation: 3, 8, 10 and 25 years after forest fires. It was revealed that in the Pokrovsk, Borogontsy and Berdigestyakh areas, it is possible to reach the depth of thawing of the ice horizon, which is due to high mean annual air temperatures and the spread of sandy loam in the upper part of deposits. And if the vegetation is not restored within the first three years, then presumably cryogenic processes will occur in these areas. In other areas, according to the modeling results, thawing does not reach the ice complex; gradual self-restoration of vegetation should bring geocryological conditions to their original state within 20-25 years. Soil temperatures are expected to rise, which is related to the current general warming of the climate. If the warming trend continues, thawing and soil temperature increases will be more significant and noticeable.
Новоприезжая, В. А.
Расчетные геокриологические характеристики межаласий после лесных пожаров в Центральной Якутии / В. А. Новоприезжая, А. Н. Федоров ; Институт мерзлотоведения им. П. И. Мельникова // Вестник Северо-Восточного федерального университета им. М. К. Аммосова. Серия "Науки о Земле". - 2025. - N 3 (39). - С. 67-77. - DOI: 10.25587/2587-8751-2025-1-67-77
DOI: 10.25587/2587-8751-2025-1-67-77
Год выпуска: 2017
Количество страниц: 12 с.
Currently, the problem of reducing the efficiency of reservoir pressure maintenance systems at late stages of field development with highly heterogeneous reservoirs is a serious one for the oil and gas industry. This paper considers the Srednebotuobinskoye oil and gas condensate field (SBNGKM), which is characterized by highly heterogeneous reservoir, water cut in some wells exceeding 95%, and low water injection efficiency. In this paper, waterflooding optimization using the streamline method was applied for the first time for the conditions of one of the largest fields in Yakutia – SBNGKM. The objective of the work was to increase the efficiency of reservoir pressure maintenance by redistributing injection between injection wells using hydrodynamic modeling of streamlines. The research materials included a three-dimensional hydrodynamic model of the Bt formation of the SBNGKM central block in the tNavigator software, historical data on 37 production and 15 injection wells for the period 2010-2021. An algorithm for redistributing injection with an increase in volumes in highly efficient wells by 20-30% and a decrease in low-efficiency wells by 15–40% was implemented. The results showed an increase in average injection efficiency by 41%, a decrease in water cut by 3.2% and an increase in cumulative oil production by 65,414 tons over a 10-year forecast period. Practical significance is confirmed by an increased ultimate oil recovery factor by 1.7% without capital expenditures. The prospects of the study are associated with the development of adaptive algorithms for automatic optimization based on machine learning and the integration of real monitoring systems for filtration parameters. The implementation of the proposed methodology can significantly increase the economic efficiency of developing complex reservoirs at a late stage of operation due to the rational use of the existing well infrastructure and water resources.
Томский, К. О.
Оптимизация заводнения Среднеботуобинского НГКМ на основе гидродинамического моделирования линий тока / К. О. Томский, М. С. Иванова, В. В. Егоров ; Северо-Восточный федеральный университет им. М. К. Аммосова // Вестник Северо-Восточного федерального университета им. М. К. Аммосова. Серия "Науки о Земле". - 2025. - N 3 (39). - С. 55-66. - DOI: 10.25587/2587-8751-2025-1-55-66
DOI: 10.25587/2587-8751-2025-1-55-66