Издательство: Наука
Год выпуска: 1985
Количество страниц: 172 с.
Издательство: Смик-Мастер
Год выпуска: 2011
Количество страниц: 552 с.
Год выпуска: 1974
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 article is devoted to the problem of wear and tear ofparts of mining equipment working with frozen soils under low climatic temperatures and the development of a method for restoring the crowns of excavator buckets teeth and bulldozer ripper with increased performance characteristics. Deposited layers obtained by overlaying surfacing with self-shielded flux cored wire and surfacing electrodes T590 (widely used in production) for surfacing with direct current and pulse mode modulated current are investigated. It is shown that when surfacing by a pulse-arc method with T590 electrodes, the content of the main alloying elements (manganese, silicon, nickel, chromium) in the weld layer is higher than in the case of surfacing by a direct current. It has been established that the microhardness of the deposited layers at surfacing by direct current is greater than when surfacing with modulated current. The way of rework of geometrical sizes of worn-out details of mining equipment using electrodes of the E-50A type at pulsed arc welding and further hardening of a surface layer of rework details using coating material with the increased physicomechanical properties is offered. Full-scale tests of the details reworked by this method and further operation at the enterprises of the Republic of Sakha (Yakutia) have shown their operability and economic reasonability.
Способ восстановления деталей горнодобывающей техники, эксплуатирующейся в условиях Севера / Н. И. Голиков, Ю. Н. Сараев, Р. П. Тихонов, С. В. Семенов, К. В. Степанова, Н. Н. Харбин // Наука и образование. — 2017. — N 4 (88), октябрь-декабрь. — С. 82-87.
Количество страниц: 6 с.
Potential of GPR data for evaluation of rocks humidity is considered. A method for evaluation of humidity of dispersed rocks by an empirical formula is proposed, which is based on determination of a relative change in the delay time (N) of GPR signals reflected from interfaces of media in frozen (tM, ns) and thawed (tT, ns) condition. The method was tested in field conditions at two sites in Central Yakutia. The GPR data are considered within an active layer, in a period of complete freezing and defrosting of the rocks. In the first site of testing the data values were taken from a part of a profile in the vicinity of the borehole test drilling. The average time delay of a GPR signal from the reference boundary at the depth of 1.7 m was calculated by three neighboring points of sounding. The relative change of the delay time of the signals Nt is evaluated. The average humidity content is calculated by the proposed formula. In accordance with the method the humidity distribution along the GPR profile in the second site of testing is also determined. Application of the method will allow to evaluate humidity of dispersed rocks remotely and its changes under the influence of various climatic and anthropogenic factors within the active layer of the permafrost zone rock mass.
Федорова, Л. Л. Методика георадиолокационной оценки влажности дисперсных горных пород / Л. Л. Федорова, Г. А. Куляндин // Наука и образование. — 2017. — N 4 (88), октябрь-декабрь. — С. 72-76.
Издательство: Советская энциклопедия
Год выпуска: 1968
Серия, номер выпуска: Маленькие энциклопедии : история, наука, техника, культура, жизнь
Количество страниц: 544 с.
Количество страниц: 10 с.
- Математика. Естественные науки > Геология. Геологические и геофизические науки,
- Прикладные науки. Медицина. Ветеринария. Техника. Сельское хозяйство > Инженерное дело. Техника в целом > Горное дело. Горные предприятия (рудники, шахты, карьеры),
- НАУКА ЯКУТИИ > МАТЕМАТИКА. ЕСТЕСТВЕННЫЕ НАУКИ > Геология. Геологические и геофизические науки,
- НАУКА ЯКУТИИ > ПРИКЛАДНЫЕ НАУКИ. МЕДИЦИНА. ТЕХНИКА. СЕЛЬСКОЕ ХОЗЯЙСТВО > Инженерное дело. Техника в целом > Горное дело. Горные предприятия (рудники, шахты, карьеры).
The nature, volumes of accumulation and composition of technogenic mineral raw materials of the Russian Federation estimated in 43,5 billion US dollars, that in 4 times exceeds cost of the reconnoitered resources are analyzed. The share of technogenic raw materials in the general structure of resources and gold reserves of the country is 7-12% and is estimated by experts at 5,000 tonnes. For subsoil use regions of the Urals, Siberia and the Far East, including the Republic of Sakha (Yakutia), the problems of developing technogenic mineral raw materials are relevant. The nature of formation, material composition and peculiarities of finding gold in various types of technogenic mineral raw materials of the Southern Urals are considered. The raw materials are presented by the tailings of percolation of the mill, pyrite flotation, slags of the goldmine plant, pyritic cinder of sulfuric acid production, ephems of runner factories, placers, screenings of sand and gravel deposits, etc. For the Far Eastern Federal District and the RS (Y), regional examples and prospects for recycling gold from waste subsoil are shown on the example of technogenic placers, tailings of the mill, etc. It is necessary to create regional banks of mineralogical data of technological features of native gold of various types of natural and technogenic mineral raw materials. It is proposed to include the course ҺTechnological Mineralogyһ in the curricula of vocational training of geologists. Complex scientific and applied mineralogical research of useful components in the composition of diverse types of technogenic raw materials is expedient for organizing within the framework of programs of the ҺTechnological Platform Solid Mineralsһ in which the NEFU named after M.K. Ammosov, Bashkir State University and other educational and scientific centers are members. The development of technogenic mineral raw materials with the use of innovative approaches and advanced technologies along with commercial benefits reduces environmental risks of subsoil use, thus contributing to creation of a positive image of a territory. Key words: technogenic mineral raw materials, placer, gold, useful components, recycling, hydrometallurgy, technological mineralogy, ecological risk.
Техногенное минеральное сырье регионов недропользования: природа, состав и перспективы рационального использования / С. К. Мустафин, Г. С. Анисимова, А. Н. Трифонов, К. К. Стручков // Наука и образование. — 2017. — N 4(88), октябрь-декабрь. — С. 7-16.
Издательство: Издательство Института мерзлотоведения СО РАН
Год выпуска: 2001
Количество страниц: 240 с.
Издательство: Издательство СО РАН
Год выпуска: 2004
Количество страниц: 496 с.