Количество страниц: 12 с.
Many unique finds of Pleistocene animals have been made on the territory of Yakutia, including whole frozen bodies. However, the majority of the finds come from the northern regions. On the territory of Central Yakutia, in contrast to Northern Yakutia, there are much fewer finds. This is due to the smaller number of preserved relict ice deposits of the Upper Pleistocene ("Yedoma") and the lack of systematic, licensed collection of mammoth ivory and other remains of the mammoth fauna due to their unsatisfactory preservation, which is caused by the stronger thawing of the permafrost in summer in Central Yakutia. There are relatively few published scientific papers on the mammoth fauna of the Amgar River basin. Therefore, new data from this area are of scientific interest. We have studied new material on the mammoth fauna from the "Mount Korolenko" locality, located on the left bank of the Amgar River near the village of the same name. The material was collected during school expeditions organised by the Amga Lyceum and the Russian Geographical Society in 2022-2023. It shows that at this site bone remains are washed out by the river on the right bank of the Amgas. Scattered bones were found on both the left and right banks, but the right bank is richer in palaeontological material. The bone remains are represented by fragments and whole bones of the postcranial skeleton of various animals. The age of most of the finds probably corresponds to the Karga interstadial. The taxonomic identification of the bones showed the presence of the following species: woolly mammoth, woolly rhinoceros, Lena horse, steppe bison, reindeer, red deer. There is a fragment of the humerus of a roe deer, possibly of late Neopleistocene age. A morphometric study of the bone remains was carried out and comparisons made with literature data. The list of large mammals that lived in the Amgas basin in the late Neoproterozoic has been completed.
Новые данные о мамонтовой фауне бассейна р. Амга / И. В. Пономарев, Г. Г. Боескоров, Д. В. Илларионов [и др.] ; Северо-Восточный федеральный университет им. М. К. Аммосова, Институт геологии алмаза и благородных металлов, Амгинский лицей имени академика Л. В.Киренского // Вестник Северо-Восточного федерального университета им. М. К. Аммосова. - 2024. - Т. 21, N 1 (95). - С. 33-44. - DOI: 10.25587/2222-5404-2024-21-1-33-44
DOI: 10.25587/2222-5404-2024-21-1-33-44
Количество страниц: 13 с.
The interplanetary magnetic field (IMF), frozen into the solar wind plasma, determines the level of geomagnetic activity and significantly affects the large-scale structure of the high-latitude ionosphere. Variations in the IMF components lead to non-stationarity of the magnetospheric convection electric field, causing changes in the spatio-temporal distribution of charged particles in the ionosphere. The situation is complicated by the fact that the geographic and geomagnetic poles do not coincide, which leads to universal time control (UT control) of the parameters of the high-latitude ionosphere. The effect of the poles displacement is most manifest in winter. Therefore, in this work, within the framework of a nonstationary mathematical model of the F-region of the ionosphere in Euler variables, taking into account the displacement between the geographic and geomagnetic poles, we study the influence of the interplanetary magnetic field components on the large-scale structure of the high-latitude ionosphere in winter. For this, the Weimer model of high-latitude electric potentials, which depends on the IMF, was used. As a result, of numerical modelling, it is shown that the IMF components affect the shape, size and spatio-temporal location of the main structural features of the high-latitude ionosphere depending on universal time. The obtained effect of ionisation tongue separation requires experimental confirmation. The obtained results demonstrate that the developed non-stationary three-dimensional model of the ionosphere in Euler variables can be applied to the study of ionospheric disturbances, including ionospheric disturbances associated with changes in the IMF components.
Гололобов, А. Ю. Численное моделирование влияния ММП на крупномасштабную структуру ионосферы с учетом несовпадения полюсов / А. Ю. Гололобов, И. А. Голиков ; Институт космофизических исследований иаэрономии им. Ю. Г. Шафера // Вестник Северо-Восточного федерального университета им. М. К. Аммосова. - 2024. - Т. 21, N 1 (95). - С. 45-57. - DOI: 10.25587/2222-5404-2024-21-1-45-57
DOI: 10.25587/2222-5404-2024-21-1-45-57
Количество страниц: 12 с.
This work reports on the methods developed by our group at ShICRA SB RAS to forecast negative manifestations of space weather from ground-based measurements of cosmic rays. Such manifestations are registered on the Earth in the form of decreases in galactic cosmic rays known as the Forbush effects, various types of geomagnetic and ionospheric disturbances, as well as auroras. Only the latters are directly visible to the naked eye, while the rest can only be detected with the help of various instruments. These occurrences are all caused by passage through the Earth’s orbit, such as the substantial influxes of charged particles from both solar and interplanetary sources, interplanetary shock waves, ejections of solar material and high-speed solar wind streams, all of which are attributed to the level of solar flares and coronal activity. The state of near-Earth space weather is determined by their presence. To monitor this state, we use data collected from ground-based cosmic ray stations and employ multiple methods to analyse these measurements. Additionally, we incorporate data from the Dst-index of the geomagnetic field and measurements of the interplanetary environmental parameters gathered by ACE, WIND, SOHO and DSCOVR spacecraft at the L1 libration point to confirm events. This has led to the development of techniques for predicting terrestrial effects of space weather in the short-term (1-3 days). Our findings suggest that it is feasible to predict the occurrence of severe geomagnetic storms in real-time through the utilisation of solely ground-based measurements from cosmic ray stations.
Прогноз возмущений солнечного ветра и геомагнитных бурь на основе наземных измерений космических лучей / А. С. Зверев, П. Ю. Гололобов, В. Г. Григорьев [и др.] ; Институт космофизических исследований и аэрономии им. Ю. Г. Шафера // Вестник Северо-Восточного федерального университета им. М. К. Аммосова. - 2024. - Т. 21, N 1 (95). - С. 58-69. - DOI: 10.25587/2222-5404-2024-21-1-58-69
DOI: 10.25587/2222-5404-2024-21-1-58-69
Количество страниц: 8 с.
The paper presents the results of a study on the search for correct methods for measuring a high-value current pulse, which will be used to conduct research on the electroplastic effect. The electroplastic effect is the effect of electric current pulses on the plastic flow of metals. Electroplastic metal forming technology is a relatively new metal forming process that is energy efficient, environmentally friendly and versatile. In particular, it can be used to process metals or alloys that are difficult to process using conventional manufacturing processes. For the experimental study of the electroplastic effect, it became necessary to measure pulse currents of large magnitude, not only in amplitude, but also in the shape of the pulse. The pulsed current causes the formation of an alternating electromagnetic field near the conductors, so it can be measured with a Rogovsky current transformer. The results of the work present a schematic electrical diagram and a photograph with the appearance of an experimental installation for the study of the electroplastic effect. The results of measurements of the current value, the voltage drop on the sample and the dependence of the peak voltage values on the sample on the peak current value are shown. After making calculations and renormalising the data for the voltage drop on the sample according to the peak value of the current obtained on the transformer, the authors obtained the desired current values. The error of this method is estimated by calculating the total capacitance of capacitors, which does not exceed 2%.
Разработка способа измерения импульсных токов большой величины / В. П. Татаринов, П. С. Татаринов, Ю. В. Бебихов [и др.] ; Северо-Восточный федеральный университет им. М. К. Аммосова, Политехнический институт (филиал), Институт физики молекул и кристаллов УФИЦ, Институт проблем сверхпластичности металлов // Вестник Северо-Восточного федерального университета им. М. К. Аммосова. - 2024. - Т. 21, N 1 (95). - С. 81-88. - DOI: 10.25587/2222-5404-2024-21-1-81-88
DOI: 10.25587/2222-5404-2024-21-1-81-88
Количество страниц: 4 с.
Autosomal dominant spinocerebellar ataxias (AD SCA) can occur with a wide variety of non-cerebellar symptoms, including movement disorders. In fact, movement disorders are common in many different subtypes of SCA, and they may be present, dominant, or even an isolated feature of the disease. In this article we describe 9 clinical cases of spinocerebellar ataxia type 1, the clinical picture of which includes cervical dystonia with laterocollis. In all cases, a mutation in the ATXN1 gene was detected.
Варламова, М. А. Спиноцеребеллярная атаксия 1-го типа с цервикальной дистонией: клинический полиморфизм или сочетание двух заболеваний? / М. А. Варламова, Т. К. Давыдова, А. Е. Адамова ; Якутский научный центр комплексных медицинских проблем // Якутский медицинский журнал. - 2024. - N 2 (86).- С. 102-105. - DOI: 10.25789/YMJ.2024.86.24
DOI: 10.25789/YMJ.2024.86.24
Количество страниц: 5 с.
The purpose of the report was to present our own observation of clinical cases with Ullrich congenital muscular dystrophy in two unrelated Yakut families. The cause of the disease in the first family was two mutations in a compound heterozygous state: c.1561C>T and c.2329T>C in the COL6A2 gene; in the second family, the c.2329T>C mutation in the COL6A2 gene in a homozygous state. Despite the rarity of the disease, neurologists and geneticists, when identifying symptoms of myopathy, delayed motor development, and the presence of hypermobility in the distal joints, contrasting with retractions of the proximal and axial joints, must be alert to Ullrich CMD. Next-generation sequencing techniques make it easier to diagnose the disease.
Врожденная миодистрофия Ульриха: описание клинических случаев / П. И. Голикова, Г. Д. Москвитин, А. Л. Сухомясова [и др.] ; Медицинский институт Северо-Восточного федерального университета им. М. К. Аммосова, Медико-генетический центр Республиканской больницы 1-Национального центра медицины // Якутский медицинский журнал. - 2024. - N 2 (86).- С. 98-102. - DOI: 10.25789/YMJ.2024.86.23
DOI: 10.25789/YMJ.2024.86.23
Количество страниц: 4 с.
The article demonstrates a clinical case of Sweet's syndrome associated with hypomethylating agents in patient with myelodysplastic syndrome. The recurrent course of Sweet's syndrome and the ineffectiveness of maintenance doses of prednisolone required a revision of the treatment tactics for myelodysplastic syndrome with the abolition of hypomethylating agents. Therapeutic tactics for patients with a rare disease, Sweet's syndrome, should be selected individually, taking into account the form of the disease and concomitant pathology.
Клинический случай развития синдрома свита у пациентки с миелодиспластическим синдромом / У. В. Семенова, А. И. Борисов, Т. Н. Александрова [и др.] ; Медицинский институт Северо-Восточного федерального университета им. М. К. Аммосова, Республиканская больница 1-Национальный центр медицины // Якутский медицинский журнал. - 2024.- N 2 (86). - С. 94-97. - DOI: 10.25789/YMJ.2024.86.22
DOI: 10.25789/YMJ.2024.86.22
Количество страниц: 6 с.
Time to the most recent common ancestor (TMRCA) of Sakha men with haplogroup N3a2-M1982 of the Y chromosome was evaluated by 23 STR markers using the mutation rate constant of Y-STR loci that we had previously calculated. The obtained TMRCA values indicate a period of ~1300-1400 years ago (VI-VII centuries AD), associated with the primary expansion of the population. Based on genetic data and analysis of texts from ancient Chinese chronicles, a hypothesis has been put forward about the connection of the ancestral Sakha population with the Yuzhe people, who supplied mammoth ivory to China.
Адамов, Д. С. Датировка времени ближайшего общего предка саха (якутов) с гаплогруппой N3A2-M1982 Y-хромосомы: новые этногенетические реконструкции / Д. С. Адамов, А. Н. Алексеев, С. А. Федорова ; Якутский научный центр комплексных медицинских проблем, Северо-Восточного федерального университета им. М. К. Аммосова, Институт естественных наук, Институт гуманитарных исследований и проблем малочисленных народов Севера // Якутский медицинский журнал. - 2024. - N 2 (86). - С. 88-93. - DOI: 10.25789/YMJ.2024.86.21
DOI: 10.25789/YMJ.2024.86.21
Количество страниц: 5 с.
In this work an assessment of the allostatic reaction of the thyroid gland was carried out in residents of Yakutia using the mathematical model SPINA, in the winter-spring period, at negative atmospheric temperatures (from -47°C to -11°C). A change in the homeostasis of the hypothalamus-pituitary-thyroid axis (type 2 allostasis) at low ambient temperatures was detected in 70% of the examined persons living in extremely cold climatic conditions of central Yakutia.
Аллостаз щитовидной железы 2 типа у жителей Якутии / А. А. Никанорова, Т. В. Борисова, В. Г. Пшенникова [и др.] ; Якутский научный центр комплексных медицинских проблем, Северо-Восточного федерального университета им. М. К. Аммосова, Институт естественных наук // Якутский медицинский журнал. - 2024. - N 2 (86). - С. 80-84. - DOI: 10.25789/YMJ.2024.86.19
DOI: 10.25789/YMJ.2024.86.19
Количество страниц: 4 с.
The additional retention elements were determined taking into account the individual anatomical-topographical variability of the pliability zones location, exit places of neurovascular bundles and places with dense mucous membrane on the upper jaw, which create negative pressure zones medial to the borders of the prosthetic bed to improve the retention of complete removable laminar dentures on the upper jaw. The developed method considerably reduces the probability of vascular compression with microcirculation disturbance and traumatization of soft tissues to which the prosthetic construction adjoins and excludes fracture of the base of the complete removable laminar dentures. In case of depressurization of external valve zones, this method at the expense of additional internal valve zones located in places where there is sufficient pliability and there are no neurovascular bundles and exostoses provides an increase in the degree of retention and stabilization of complete removable prosthetic constructions on the upper jaw during their operation.
Способ улучшения фиксации полных съёмных протезов на беззубой верхней челюсти при помощи последовательно-замкнутых клапанных зон / И. Д. Ушницкий, Н. И. Борисов, И. С. Пинелис, А. В. Юркевич ; Медицинский институт Северо-Восточного федерального университета им. М. К. Аммосова, Клиника ООО "Гармония", Читинская государственная медицинская академия, "Дальневосточный государственный медицинский университет" Министерства здравоохранения Российской Федерации // Якутский медицинский журнал. - 2024. - N 2 (86). - С. 35-38. - DOI: 10.25789/YMJ.2024.86.09
DOI: 10.25789/YMJ.2024.86.09