Издательство: Ахсаан
Год выпуска: 2012
Серия, номер выпуска: Серия "Математика и математики"
Количество страниц: 184 с.
Ответственность: ответственный редактор Н. С. Иванов
Издательство: Наука
Год выпуска: 1965
Количество страниц: 86 с.
- Институт мерзлотоведения им. П.И. Мельникова СО РАН > Публикации,
- Математика. Естественные науки > Физика,
- Прикладные науки. Медицина. Ветеринария. Техника. Сельское хозяйство > Инженерное дело. Техника в целом > Горное дело. Горные предприятия (рудники, шахты, карьеры),
- НАУКА ЯКУТИИ > ПРИКЛАДНЫЕ НАУКИ. МЕДИЦИНА. ТЕХНИКА. СЕЛЬСКОЕ ХОЗЯЙСТВО > Инженерное дело. Техника в целом > Горное дело. Горные предприятия (рудники, шахты, карьеры).
Иванов, Николай Сергеевич.
Теплофизические свойства мерзлых горных пород : справочное пособие / Н. С. Иванов, Р. И. Гаврильев ; Академия наук СССР, Сибирское отделение, Институт мерзлотоведения ; ответственный редактор Н. С. Иванов. - Москва : Наука, 1965. - 71, [1] с.
Издательство: [б. и.]
Год выпуска: 1969
Количество страниц: 100 с.
Издательство: Наука
Год выпуска: 1966
Количество страниц: 150 с.
Издательство: Наука
Год выпуска: 1968
Количество страниц: 176 с.
Издательство: Якутский научный центр СО РАН
Год выпуска: 1992
Количество страниц: 252 с.
Геохронология и изотопная геохимия карбонатитов Якутии = Geochronology and isotope geochemistry of carbonatites from Yakutia / Рос. акад. наук, Сиб. отд-ние, Якут. ин-т геол. наук ; [А. И. Зайцев и др. ; отв. ред. В. М. Мишнин]. - Якутск : Якутский научный центр СО РАН, 1992. - 246, [2] с.
Издательство: Наука, Сибирское отделение
Год выпуска: 1986
Количество страниц: 274 с.
Количество страниц: 11 с.
Currently, the use of electron microscopes in medicine is developing intensively, including scanning electron microscopes (SEM), which are designed to solve a huge number of problems in various fields with a wide range of electron accelerating voltages and electron beam energies. The development of an SEM with certain emission characteristics, with a range of lower beam energies for the study of biological samples, is an urgent task because modifying the SEM to solve problems in medicine, for example, would make it possible to obtain higher-quality images of biospecimens for diagnostics and monitoring the effectiveness of therapy. To develop new SEMs with certain characteristics, it is proposed to conduct less expensive research using numerical methods based on mathematical models of processes in electron-optical SEM systems. In this regard, this work sets the task of determining the size and shape of the beam, the main emission characteristics of the field electron cathode (FEC) of the SEM, which is under the influence of the electric field that excites electron emission and the external longitudinal magnetic field by studying the movement of the outermost electron of the beam, taking into account the influence of space charge beam electrons, external magnetic field. In the model, the FEC is approximated by a paraboloid of rotation, and the concept of a boundary “outermost” electron is introduced, the trajectory of which determines the shape and size of the beam. The problem of calculating the emission characteristics along the trajectory of the outermost electron of a FEC is solved using a mathematical model that includes the following equations: motion of the "outermost" electron, Maxwell outside and inside the beam, continuity of the current density, Fowler-Nordheim equation. As a result, a system of 18 first-order ordinary differential equations was obtained, the numerical calculation of which using the 4th order Runge-Kutta method allows us to obtain the emission characteristics of the FEC. As a result, it is suggested that it would be feasible to modify SEMs for more effective use in the medical field, taking into account their increasing use in disease diagnosis and the possible improvement of image quality through the development of FEC SEMs with more suitable characteristics.
Математическое моделирование эмиссионных характеристик полевого электронного катода в растровом электронном микроскопе в условиях исследования биообразцов / С. Н. Мамаева, Н. В. Егоров, Б. В. Яковлев [и др.] ; Северо-Восточный федеральный университет им. М. К. Аммосова, Санкт-Петербургский государственный университет, Московский государственный университет имени М. В. Ломоносова // Вестник Северо-Восточного федерального университета им. М. К. Аммосова. - 2024. - Т. 21, N 1 (95). - С. 70-80. - DOI: 10.25587/2222-5404-2024-21-1-70-80
DOI: 10.25587/2222-5404-2024-21-1-70-80
Количество страниц: 7 с.
- Математика. Естественные науки > Общая биология. Антропология. Вирусология. Микробиология,
- Прикладные науки. Медицина. Ветеринария. Техника. Сельское хозяйство > Сельское хозяйство. Лесное хозяйство. Охота. Рыболовное хозяйство,
- НАУКА ЯКУТИИ > МАТЕМАТИКА. ЕСТЕСТВЕННЫЕ НАУКИ > Общая биология. Антропология. Вирусология. Микробиология,
- НАУКА ЯКУТИИ > ПРИКЛАДНЫЕ НАУКИ. МЕДИЦИНА. ТЕХНИКА. СЕЛЬСКОЕ ХОЗЯЙСТВО > Сельское хозяйство. Лесное хозяйство. Охота. Рыболовное хозяйство.
The importance of studying the microelement composition of soils and vegetation in the Northern territories is due to the role of microelements in soil formation under cryolithozone conditions, and secondly, the influence of the microelement background of plants on the physiological functions of animals and humans. At the same time, heavy metals deserve special attention as they pose a threat to all living organisms due to their ability to accumulate. The article presents data on the content of heavy metals in the aboveground parts of meadow grasses growing under cryolithozone conditions - in the Khangalassky district, located in the Central Yakut biogeochemical province. Atomic absorption spectral analysis showed that the content of heavy metals - cadmium and lead - in the aboveground parts of the studied plants varied significantly depending on the place of collection, but did not exceed the maximum permissible concentrations. The concentration of zinc in some of the herbal collection points exceeded the maximum permissible concentrations. The need to study the content of heavy metals in plants is due to the fact that they are the primary link in the movement of toxic elements along the trophic chain into the human body. Lead and cadmium accumulate in parenchymal organs, are carcinogenic and affect the morbidity and mortality of the northern population.
Миронова, Г. Е. К вопросу о содержании токсических элементов в луговых травах сельской местности Хангаласского района / Г. Е. Миронова, А. А. Григорьева ; Северо-Восточный федеральный университет им. М. К. Аммосова, Якутский научный центр комплексных медицинских проблем, Арктический медицинский центр // Вестник Северо-Восточного федерального университета им. М. К. Аммосова. - 2024. - Т. 21, N 1 (95). - С. 5-11. - DOI: 10.25587/2222-5404-2024-21-1-5-11
DOI: 10.25587/2222-5404-2024-21-1-5-11
Количество страниц: 12 с.
Pyrola incarnata is a typical boreal species that is widespread in the taiga zone. In Central Yakutia, it often acts as a co-dominant in the herbaceous-shrub layer of larch forests. Based on the results of analysis of geobotanical descriptions according to the Brown-Blanke method, all phytocenoses with the participation of P. incarnata were divided into 4 associations (acc. Saxifrago bronchialis-Pinetum sylvestris, acc. Limnado stelleri-Laricetum cajanderi, acc. Aquilegio parviflorae-Laricetum cajanderi and acc. Ledo palustris-Laricetum cajanderi), which belong to the class of coniferous forests Vaccinio-Piceetea Br.-Bl., Siss. et Vlieger 1939 [1]. The article presents data on the analysis of environmental parameters and floristic analysis of forest communities with the participation of Pyrola incarnata. The leading families and related species involved in the formation of phytocenoses together with P. incarnata, the dependence of the state of P. incarnata on the floral composition of phytocenoses were identified. The identification of the ecological preferences of P. incarnata was carried out according to the method of environmental humidity indicators and richness factors-salinity. As a result of the studies conducted in the conditions of Central Yakutia, we have found out that the species is characterised by a relatively wide range of tolerance in terms of the moisture factor. It prefers growth sites from dry meadows to raw meadows type of moisture, stages from 59.2 to 68.3, and in terms of the richness-salinity prefers rather rich soils, stages from 8.2 to 11.5. At the same time, the phytocenoses of assoc. Ledo palustris-Laricetum cajanderi, Limnado stelleri-Laricetum cajanderi and Saxifrago bronchialis-Pinetum sylvestris were clearly distributed along the gradients of richness-salinity and moisture, and the communities of assoc.. Aquilegio parviflorae-Laricetum cajanderi tends towards dry meadow conditions and is located completely on top of the indicators of the communities of the association Saxifrago bronchialis-Pinetum sylvestris, and partially overlapping the area. The indicators of the Limnado stelleri-Laricetum cajanderi assoc. did not affect the area of wetter conditions, the zone of distribution of the phytocenoses of the Ledo palustris - Laricetum cajanderi assoc.
Никифорова, А. А. Эколого-флористическая характеристика лесных сообществ с участием Pyrola incarnatа (DC.) Freynв условиях Центральной Якутии / А. А. Никифорова ; Северо-Восточный федеральный университет им. М. К. Аммосова // Вестник Северо-Восточного федерального университета им. М. К. Аммосова. - 2024. - Т. 21, N 1 (95). - С. 12-23. - DOI: 10.25587/2222-5404-2024-21-1-12-23
DOI: 10.25587/2222-5404-2024-21-1-12-23