Для визначення показників довговічності систем зі структурним резервуванням запропоновано метод, який ґрунтується на застосуванні багатовимірних ациклічних марковських моделей. На основі запропонованого методу для дубльованої системи із паралельним резервуванням визначено гамма-процентний ресурс, інтенсивність відмов та ймовірність розподілу за відмовами.
This paper describes the synthesis of geopolymer materials using thermally modified clay rocks of Georgia and metallurgical granulated blast-furnace slag; as well as the study of their physical and mechanical properties, durability, and corrosion resistance in aggressive solutions.The methods of chemical, X-ray phase, differential thermal analysis and SEM were used.
Problem statement. The production of oil crops and products of their processing has significantly increased in recent decades. Vegetable oils are mainly produced by pressing oilcontaining raw materials using screw-type presses. During the press operation, there is a need to adapt its working regimes to the seeds of individual crops while ensuring the possibility of adjusting certain operation parameters that are set technologically. Purpose.
Among the several kinds of thermoplastic adhesives, structured and non-structured polyvinyl acetate (PVA) adhesives have a rather wide application and are used currently for forming adhesive joints from different wood species, especially oakwood. To ensure proper conditions of oakwood adhesive joints use, it is important to have fast and accurate methods of predicting their strength and durability. The strength changes of the oakwood adhesive joints bonded with structured and non-structured PVA adhesives have been investigated by conducting long-term experiments.
Aim. In the study learning trial was made to make a mathematical model of the assembling process in connections “tungsten carbide insert cutter – cone”, while the methods of mathematical statistics were applied. This makes it possible to determine the parameters of the distribution of the closing link. Accordingly, the tension is determined by samples of constituent links. For this purpose, the amount of tension was investigated.
Reinforced concrete structures are often subjected to various negative environmental influences, reducing their reliability and durability. Main engineering tasks include extension of their life cycle, assessment of durability, reliability and residual service life. This requires reliable assessment of existing damages due to negative environmental impacts. Deterioration of RC structures is complex issue, which should be considered with the account of various factors.
The new method determination parameters hardening of portland cement is offered in the article.
The results of tests of embedded details with the different types of anchors at an action of shear force are described, and theoretical foundation of their interactions with concrete basis.
Mathematical model of asphalf carpet wavefornation and example of calculation bearing capacity of flu top layer of asphalt pavement against wave formation on areas of heavy braking traffic was described.