Количество страниц: 12 с.
In the Sobolev spaces, we consider the well-posedness questions for the inverse problem of recovering the source function of a mixed type equation of second order. The overdetermination conditions are the values of a solution on a collection of planes of dimension n − 1. The unknowns occurring in the right-hand side depend on time and n − 1 unknown space variables. Under certain natural conditions on the data of the problem, we obtain existence and uniqueness theorems for generalized solutions to this problem. The conditions on the data almost coincide with those ensuring solvability of the direct problem. The parameter continuation method and a priori estimates are used to validate the results. The method allows us to generalize the results to the case of smoother data and regular solutions.
Джамалов, С. З. Некоторые классы обратных задач для уравнений смешанного типа второго порядка / С. З. Джамалов, С. Г. Пятков // Математические заметки СВФУ. — 2018. — Т. 25, N 4 (100), октябрь-декабрь. — С. 3-14.
DOI: 10.25587/SVFU.2018.100.20550
Количество страниц: 6 с.
The voles of the Alticola genus currently remain one of the least well-studied groups of small mammals in Yakutia. This article presents the data on their distribution within Yakutia and their habitat preferences in virtually all mountain systems of the region; new find sites are also given. In the present work we used the data of long-term (1986 to 2017) field studies and literature. A total of 3,300 trap-days were accumulated, and 145 specimens of Alticola were collected. In the Verkhoyansk mountain system the voles more strictly keep to the habitats of the mountain tundra zone, while in the mountains of the South Yakutia they inhabit both the mountain-forest and the overlying tundra zones. Employing MaxEnt software we created a model of the geographic range of the genus Alticola using also BioClimat climate parameters. The resulting raster model of the Alticola geographic range is based on 5 variables with the highest weight: elevation, the lowest temperature of the coldest month, precipitation of the wettest three consecutive months, average annual precipitation, and precipitation of the wettest month. The model of the geographic range revealed two zones with the optimal conditions for the given genus: in the North-East of Yakutia it is the Verkhoyansk Range, Chersky Range and Momsky Range; in the South of Yakutia it is the Aldan Plateau and the Udokan Range.
Васильева, В. К. Распространение полевок рода Alticola Blandford, 1881 в Якутии и создание модели их ареала в программной среде MaxEnt / В. К. Васильева, И. М. Охлопков, Б. З. Борисов // Наука и образование. — 2017. — N 4 (88), октябрь-декабрь. — С. 135-140.
Количество страниц: 6 с.
During 2013-2016 small mammals have been collected in the interfluve area between the Anabar and Olenyok Rivers, in the upper reaches of the Udya River (71°02'N, 116°33'E), at the site of the projected development of one of the world richest deposit of rare earth elements Tomtor. Standard methods were used for collecting small mamals (snap traps and 20-meter furrows with cone-shaped pitfall traps). A total of 860 cone-days and 2,150 trap days were accumulated. For community structure analysis we used only the data collected with the catch furrows. The results of the survey indicate that the population of insectivores and mouse-like rodents is presented by only eight species. The fauna of the area seems to be poorer than that of the Taymyr Peninsula and, to a lesser extent, of the Lena River valley. During the 3-year period of observations the abundance of small mammals varied insignificantly. The majority of the small mammal population in the studied area was comprised of the wood lemming, who dominated both in forest and open-area communities. This is not typical for small mammal communities of the North-West of Yakutia. Whether it is a stable characteristic of this community or a temporary phenomenon can be established only by further observations.
Вольперт, Я. Л. Мелкие млекопитающие территории Томторского месторождения редкоземельных металлов (Западная Якутия) / Я. Л. Вольперт, В. А. Данилов // Наука и образование. — 2017. — N 4 (88), октябрь-декабрь. — С. 130-134.
Количество страниц: 6 с.
Nowadays the use of satellite telemetry for study of animal ecology is still actual. The domestic radio transmitter "Pulsar" of the satellite system "Argos" / GLONASS was first used to monitor the move-ments and determine the daily course of the Siberian roe deer of Yakutia under natural conditions. The observation range was selected from the protected areas of the Republic, the resource reserve "Jorono" in the Khangalasskiy district. A female Siberian roe deer was caught on the Lena River crossing. After that, the satellite collar was fixed on the animal, after the installation, the roe deer was released. The location data from the transmitter were obtained in the early winter period during the month of 2014. With the help of these locations, 25 diurnal movements of the roe deer were determined. Using of GIS processing, the boundaries of the site and habitat were determined, the selectivity by stations and the influence of weather factors on the daily course during the observation period were revealed. The first experience of the study of the Siberian roe deer ecology with the help of satellite telemetry of the GPS-radio allowed to obtain scientific data on the use of the territory by ungulates in the early winter period. The received data will be used for Siberian roe deer population counts in Central Yakutia.
Кириллин, Е. В. Характеристика использования территории и суточного хода сибирской косули (Capreolus pygargus Pall., 1771) Центральной Якутии в раннезимний период по данным спутниковой телеметрии / Е. В. Кириллин, Р. А. Кириллин, Е. А. Николаев // Наука и образование. — 2017. — N 4 (88), октябрь-декабрь. — С. 124-129.
Количество страниц: 6 с.
The article considers the pyrogenic factor as one of the key environmental factors that formed the late Pleistocene ecosystems of the Northern Hemisphere that served as the fodder base for the mammoth megafauna. The lack of direct evidence of the spread offires in the Late Pleistocene, as well as the difficulty in determining their influence on the formation of ecosystems, was compensated by modeling on the actualis-tic principles of the current spread offires in the territory of Russia, depending on macro-climatic indices. The disintegration (disappearance) of the mammoth faunal complex could be associated with strong bioceno-ses changes in the early Holocene, when due to climate change in the direction of increasing precipitation and lowering the average annual temperatures, the effect of the pyrogenic factor was minimized. This led to the fact that meadow communities stabilized in the grassy stage of the post-pyrogenic succession process, in the late Pleistocene, were actually a zonal type of vegetation, greatly reduced their areas, giving way to forest formations. Subsequently, in the Atlantic time of the Holocene and later, the number of wildfires in the territory of Yakutia increased, but due to the absence of large and giant herbivores, the stabilization of successions in grassy stages ceased and the onset offorest formations began.
Протопопов, А. В. Пирогенный фактор формирования позднеплейстоценовых экосистем Якутии / А. В. Протопопов, В. В. Протопопова // Наука и образование. — 2017. — N 4 (88), октябрь-декабрь. — С. 114-119.
Количество страниц: 6 с.
The effect ofpresowing treatment on the germination of seeds of three species of g. Iris (I. setosa, I. sanguinea, I. laevigata) was studied. The influence of the following factors was studied: 1) treatment with phytohormones (succinic acid, heteroauxin, Appin, HB-101); 2) cold stratification; 3) scarification (complete removal of the pericarp and alternating soaking and drying); 4) incision of the pericarp of the seed in the area of the scar. The seed treatment with phytohormones was not effective, it led only to the acceleration of the beginning and reduced the duration of germination compared to the control. Stratification ofI. setosa and I. sanguinea seeds at 4-8 °C stimulated the germination only of a small part of the seeds. Removal of the rind from the seeds of iris bristly did not give good results, only 1 % of seeds germinated at the 43rd day. Alternating soaking and drying of seeds of iris bristly also had no significant effect on germination. The positive result gave a cut of the seeds in the area of the scar, as the result a laboratory germination increased in comparison with the control: I. setosa by 28 %, I. sanguinea - 8,5 % and I. laevigata - 61 %.
Андросова, Д. Н. Влияние предпосевной обработки семян на всхожесть видов рода Iris / Д. Н. Андросова, Н. С. Данилова, Е. А. Афанасьева // Наука и образование. — 2017. — N 4 (88), октябрь-декабрь. — С. 109-113.
Количество страниц: 6 с.
- Математика. Естественные науки > Ботаника,
- Прикладные науки. Медицина. Ветеринария. Техника. Сельское хозяйство > Сельское хозяйство. Лесное хозяйство. Охота. Рыболовное хозяйство,
- НАУКА ЯКУТИИ > МАТЕМАТИКА. ЕСТЕСТВЕННЫЕ НАУКИ > Ботаника,
- НАУКА ЯКУТИИ > ПРИКЛАДНЫЕ НАУКИ. МЕДИЦИНА. ТЕХНИКА. СЕЛЬСКОЕ ХОЗЯЙСТВО > Сельское хозяйство. Лесное хозяйство. Охота. Рыболовное хозяйство.
In conditions of the Middle Lena valley, a growth regulator was used for the first time as a stimulant, which increases the germination of seeds, stimulates the initial growth ofplants, promotes resistance to diseases and generally improves the adaptability of perennial grasses in the first years of life. In the studies, the growth stimulator Krezacin was used. "Krezacin" (trekazin, irkutin) is an immunostimulant, adaptogen of a new generation. It is usedfor active rooting and strengthening ofplant immunity in the first years ofplant life. The mechanism of its action is based on optimization of biosynthesis of proteins, nucleic acids, enzymes. The preparation acts on the cellular level and activates adaptive reactions of plants. The studied areas of field experiments were located in the Middle Lena valley at the scientific station ҺMarkhinskyһ of the Institute for Biological Problems of Cryo-lithozone of the SB RAS, located 13 km away from Yakutsk city. For the first time in the conditions of cryogenic floodplain layered soils, the influence of the growth stimulant Kresacin on linear growth, productivity, shoot formation and the structure of shoots of a smooth brome of the variety SibNIISKhoz-189 was studied. Over the years of study, it was proven that an effective dose of a growth stimulant Krezacin is 75 ml /10 l. Three years studies have established that soaking of smooth brome seeds with Krezacin in a given dose promotes an increase in the linear height of smooth brome up to 110.8 cm, the productivity of the above-ground mass by 2 times, an increase in the number of generative shoots by 1.8 times, vegetatively elongated shoots by 2.3 times and vegetatively shortened ones by 1.6 times. At the same time, the mass of one generative shoots of smooth brome is 3.5 g, which exceeds the control by 16 %, which indicates the maturity and usefulness of the sown phytocenosis.
Барашкова, Н. В. Влияние стимулятора роста "Крезацин" на рост и развитие костреца безостого в условиях долины средней Лены / Н. В. Барашкова, Е. Р. Неустроева // Наука и образование. — 2017. — N 4 (88), октябрь. -декабрь. — С. 99-103.
Количество страниц: 6 с.
- Математика. Естественные науки > Математика,
- НАУКА ЯКУТИИ > МАТЕМАТИКА. ЕСТЕСТВЕННЫЕ НАУКИ > Математика,
- Прикладные науки. Медицина. Ветеринария. Техника. Сельское хозяйство > Инженерное дело. Техника в целом,
- НАУКА ЯКУТИИ > МАТЕМАТИКА. ЕСТЕСТВЕННЫЕ НАУКИ > Физика,
- НАУКА ЯКУТИИ > ПРИКЛАДНЫЕ НАУКИ. МЕДИЦИНА. ТЕХНИКА. СЕЛЬСКОЕ ХОЗЯЙСТВО > Инженерное дело. Техника в целом.
This paper considers a mathematical model of joint laying of water pipeline networks and district heat networks. The purpose of the work is to study the effect of radiation on the process of complex heat exchange taking place in the housing insulation between structural elements. The results of mathematical simulation of the heat loss taking into account the radiant component are given. When calculating the heat flows which are lost in the pipeline through thermal insulation at transporting the coolant, the heat transfer process is usually considered by means of conduction and convection. The radiant component is neglected in most cases. The influence of heat transfer by radiation and convection is particularly noticeable using thermal insulation products with large pores and air gaps. A ground configuration of a pipe line and water pipe line laid in a joint thermal insulation made of mineral wool is considered. When laying joint pipelines, complex radiative heat transfer occurs. It consists, for each one of these pipelines, of radiation reflected from the other pipeline and self-radiation. A non-stationary temperature field of the structure, consisting of two parallel stacked pipes with different diameters lying in a joint insulating structure made of mineral wool, is calculated. The construction elements exchange heat with each other and the environment by convection and radiation.
Степанов, А. В. Оценка влияния лучистой составляющей на сложный теплообмен между сетевым трубопроводом и водопроводом при совместной прокладке / А. В. Степанова, Г. Н. Егорова // Наука и образование. — 2017. — N 4 (88), октябрь-декабрь. — С. 93-98.
Количество страниц: 6 с.
The basics of physical modeling of complex processing technology for manufacturing of ul-trafine-grained structure for high-strength materials has been delivered in the paper. The screw press process influence on extrusion process of prismatic and spiral shaped lean steel probes has been presented. This steel 09G2S is widely used for vital structures in permafrost regions of Central Yakutia. On the base offrac tograms ofprobe breaks the reasons of high strength and low plasticity ofprocessed steel have been qualitatively interpreted. The ductile fracture mechanism of processed steel probes after the extrusion and screw pressing is characterized by more pronounced of surface microrelief against the initial material. The regularities ascertained in such a modeling allows to approach for further improvement as in the severe plastic deformation experimental research, as in the combine hardening technology on the whole.
Коваленко, Н. Д. Физическое моделирование комбинированного процесса экструзии и винтового прессования стали / Н. Д. Коваленко, В. В. Лепов, А. М. Иванов // Наука и образование. — 2017. — N 4 (88), октябрь-декабрь. — С. 77-81.
Количество страниц: 8 с.
- Математика. Естественные науки > Геология. Геологические и геофизические науки,
- Прикладные науки. Медицина. Ветеринария. Техника. Сельское хозяйство > Сельское хозяйство. Лесное хозяйство. Охота. Рыболовное хозяйство,
- НАУКА ЯКУТИИ > МАТЕМАТИКА. ЕСТЕСТВЕННЫЕ НАУКИ > Геология. Геологические и геофизические науки,
- НАУКА ЯКУТИИ > ПРИКЛАДНЫЕ НАУКИ. МЕДИЦИНА. ТЕХНИКА. СЕЛЬСКОЕ ХОЗЯЙСТВО > Сельское хозяйство. Лесное хозяйство. Охота. Рыболовное хозяйство.
In view of climate warming, there is a need for parameterization of boundary conditions in predictive assessments of the ground temperature regime in cold regions. For this, an experimental study has been conducted at the Tuymaada monitoring site of Melnikov Permafrost Institute of the SB RAS to investigate the ground thermal regime following the removal of snow and vegetation covers. Field data have been collected for a two-year cycle. These data are compared with the findings from a similar study performed by A. V. Pavlov in the early 1970s. During this period, the mean annual air temperature has increased by 2.6 °C. As a result, the mean annual ground temperature at a depth of 3 m has warmed by 0.6 °C at the undisturbed site and by 1.4 °C at the disturbed site, with the ground properties remaining virtually unchanged. It is therefore evident that the current changes in climate and its elements should be taking into account during engineering design and ground temperature regime forecasts.
Варламов, С. П. Температурный режим почвогрунтов при нарушении покровов в современных климатических условиях Центральной Якутии / С. П. Варламов, А. Ф. Жирков, Д. А. Находкин // Наука и образование. — 2017. — N 4 (88), октябрь-декабрь. — С. 65-71.