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МАТЕМАТИКА И ЕСТЕСТВЕННЫЕ НАУКИ


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1

The fundamentals of molecular magnetism

Автор: Lukov V. V.
Изд-во ЮФУ: Ростов н/Д.

Molecular magnetism occupies a crossing point between two fields of research -materials science and metal biochemistry – and plays an important role in the field of molecular electronics. The “Fundamentals of molecular magnetism” is the textbook to comprehensively address both the experimental and theoretical aspects of the relatively new field of research. It introduces the basic concepts concerning magnetization and magnetic susceptibility, establishes the fundamental equations of molecular magnetism and examines molecules containing a unique magnetic center, including the highspin -low-spin transition compounds. The textbook highlights polymetallic species, reviews the phenomenon of interaction between spin carriers from a theoretical point of view and includes numerous examples throughout to illustrate the topics discussed. An essential part of the textbook is devoted to novel class of magneto active materials -single molecular magnets (SMMs).

Предпросмотр: The fundamentals of molecular magnetism (Основы молекулярного магнетизма) на английском языке.pdf (0,3 Мб)
2

T ermal regime of water courses of diff erent order in the basin of the Upper Kolyma River

Автор: Samokhvalov

Evaluation of hydrological parameters and temperature regime of watercourses of various orders comes to the fore when studying the scientific problems of hydrobiology of watercourses and solving practical problems of development of fisheries and gold exploration in the regions of the Far North. This became particularly relevant due to a significant reduction in hydrological observations since the early 1990s. This article presents a quantitative investigation into the thermal regime of water courses and their spatial pattern. The paper focuses specifically studying the temperature and basic spatial parameters of streams and rivers in the area of interest. Statistical methods helped identify a close linkage between the temperature of water courses in the basin of the Upper Kolyma River and their respective sizes. A common trend has been found proving that the water temperature in the rivers increases downstream and with the increase in water course size, also known as order. A close correlation between the average water temperature, on the one hand, and the catchment area and water course length, on the other, is indicated by the relatively high correlation coefficients of 0.61 to 0.63 and 0.71 to 0.73, respectively. Average water temperatures in the summer and warm periods have been found to escalate with the increase of water course order from low (I and II) to high (VI–VII) by 4.7°C and 5.9°C, respectively, and in the Kolyma River – in the direction from the upper section (Orotuk village) to the lower section (the Korkodon River mouth) by 1.7°C and 2.1°C, respectively, even though the lower section of the river is located almost 2° north of the upper section. Due to the presence of perennial permafrost, river taliks have a cooling effect on the thermal regime of watercourses, so coolness occurs in sections of the river where there are favorable conditions for their formation. This is, first of all, the increased thickness of the well-permeable coarse-grained alluvium of the channel facies and open fracture zones in the bedrock.

3

Three-dimensional structure of tundra vegetation cover dominated by sedges

Автор: Matelenok

Modelling of radiation transfer through natural multilayer media is relevant for many climatological, hydrological and ecological issues. Te possibility of using the models is determined by the comprehensiveness of the information on the properties and structure of certain layers: ground, vegetation, atmosphere. Tree-dimensional spatial organisation of tundra vegetation cover is understudied compared to vegetation structure of the boreal zone. In the scope of the research, the structure of sedge-tundra vegetation cover in the Nenets Autonomous Area and the Murmansk Region was investigated using specialised hardware-sofware system which allows to take photos of the cover from diferent angles, construct virtual three-dimensional models and obtain the values of parameters characterising the structure. Te feld survey of the sites was carried out in August 2016 and 2017. Phytoelement angle distributions obtained difer from standard erectophile distribution frequently used for modelling orientation of phytoelements in cover formed by grasses/sedges. Te shape of phytoelement angle distribution varies from site to site depending on the dominant species. Experiments on ftting real distributions by diferent functions established that the generalised shape of the distribution in the studied cover is best described by a rotated-ellipsoidal function with a parameter equal to 2.69. Information obtained on the structure of the vegetation cover can be used in modelling microwaves and solar radiation propagation.

4

The first moderns in Anatolia

Автор: Savas
ПРОМЕДИА: М.
5

The World of People and Animals

ФЛИНТА: М.

В пособии представлены учебно методические материалы, которые могут быть использованы в элективных языковых курсах «Биология и экология. Мир птиц и млекопитающих» и «Лингвокультурология на английском языке».

Предпросмотр: Мир людей и животных (1).pdf (0,2 Мб)
6

T-пространства в относительно свободной алгебре Грассмана

Автор: Цыбуля Л. М.
Издательство Прометей: М.

Монография содержит результаты исследований по T-пространственной и мультипликативной структуре относительно свободной алгебры Грассмана F (3), соответствующей тождеству [[Х1, Х2], Х3] = 0, над бесконечным полем характеристики p > 0. Наибольшее внимание уделяется унитарно замкнутым T-пространствам. Одним из главных результатов является разложение фактор-T-пространств, связанных с F (3), в прямую сумму простых компонент. Кроме того, изучаемые T-пространства оказываются коммутативными подалгебрами в F (3), что позволяет описать F (3) и некоторые ее подалгебры, как модули над этими коммутативными алгебрами. В приложении изучаются не унитарно замкнутые T-пространства, а также случай поля нулевой характеристики.

Предпросмотр: T -пространства в относительно свободной алгебре Грассмана Монография .pdf (0,3 Мб)
7

The human touch of chemistry

ПРОМЕДИА: М.

Обзор интернет-портала, посвященного химии, ее истории и перспективам развития.

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The metod simplifing inverse Laplace transformatijn at ossillatory processes researchet: Учебное пособие

Автор: Zolotarev I. D.
[Б.и.]

The research method processes in oscillatory systems in stated.It permits essenyial simplification of the most difficult operation in finding solution of a sistem differential equation - inverse Laplace transformation.

Предпросмотр: The metod simplifing inverse Laplace transformatijn at ossillatory processes researchet Учебное пособие.pdf (0,2 Мб)