Materials Literature
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Викладено результати аналізу формування ядра ущільнення при руйнуванні середовища та визначення залежностей геометрії (висоти) ядра ущільнення від фізико-механічних властивостей атомарних структур середовища і технологічних характеристик ріжучого інструменту
A variety of ways to invest building today is an occasion for a detailed analysis of the financial and credit mechanisms. Selection of optimal financing schemes and tax planning in the implementation of construction projects is the key to efficiency and profit from the activity.
Alkyl silicones have been found to be very effective at surface modification of oils and esters. By using a small amount of these alkyl silicones, the surface tension of these oils and esters can be lowered to 20–22 dynes/cm which is almost the same as silicone oil. We will investigate using these silicones in high so…
Проведено моделювання операції нарізання евольвентних зубчастих коліс дисковими фрезами під час інтегрованого застосування процесів радіально-колового зубонарізання дисковою фрезою та копіювання за безперевного ділення. Процес дає змогу підвищити продуктивність та досягнути необхідної точності профілю зубців колеса. T…
Supercapacitors are designed and used for temporary storage of electric energy. On contrary to batteries, the process of chargé accumulations occurs at the boundary between solid electrode and electrolyte. Hence, the physical surface of the electrode must he fairly high. The aim of this contribution is the description…
This study describes a method to produce cellulose aerogels by freezing nanofiber aqueous suspensions and sublimating the water phase to obtain a lightweight porous structure. As the formation of water crystallites is highly dependent on the freezing speed, various methods were attempted to obtain homogeneously distri…
Optically clear perfluorinated alkyl and n-alkyl acrylate modified thiol-ene network films were prepared via a two-step approach, first by modifying multifunctional thiols with perfluorinated n-alkyl and aliphatic n-alkyl acrylates of varying lengths followed by UV curing in the presence of multifunctional enes. Prope…
The local density of states of electrons in a graphen calculation provided based on a Green’s function method for Bethe lattice approximation.
The paper presents performance characteristics of electrically-insulating joints in the cathodic protection systems of pipelines based on the results of bench testing. It has been offered to use efficiency coefficient of electrically-insulating properties characterizing the amount of protective current that remains on…
Waterborne polyurethane dispersion chemistry, although considered a benchmark for general coatings performance, nevertheless must prove itself worthy and capable of consideration for new coatings applications. The market challenges are many; for example, the do it yourself (DIY) market appears to be ideal for one comp…
The proposed settlement depends suitable for the analysis of deformation and fracture of reinforced concrete beam is statically indeterminate systems under variable load and position-design effects, in the case of dynamic effects in the elements of these influences. Determination of the stress-strain state of the diff…
Lanthanide-doped nanoparticles have been increasingly gaining attention as possible contrast agents due to their unique upconversion luminescence properties. The luminescence of certain emission bands from NaYF4 :Er3+/Yb3+ nanoparticles are also temperature dependent, and can be used as a ratiometric temperature senso…
Экспериментально изучены фрагменты диаграммы состояний системы H2O 2-C4H9OH NaCl при 298 и 313 К. Методом электродвижущих сил с ион-селективными электродами при 298 и 323 К измерены термодинамические свойства хлорида натрия в трехкомпонентных растворах с ионной силой до 1.9 моль/кг и содержанием спирта в растворителе…
It was noted that more than 40% of failures of pipelines in the initial period of operation is determined by defects in materials and flaw of construction-and-assembling operations, and improving the quality of construction works and as a consequence, the reliability of main pipelines, is an urgent and important task…
The paper deals with the development of a new approach for high-cycle fatigue lifetime prediction, which is made in the stochastic framework and allows to take into account the natural degradation of the material properties. A mathematical expectation, correlation function and a variance of the continuum damage functi…
Conducted analytical review of developments and the main directions of development of optical-electronic systems control the flame in the combustion chambers of gas turbine engines based on publications in Russia and abroad. The results of the creation of optical-electronic system of ECO-2011 control of the flame in t…
Изучено влияние добавок MgCl2 на кинетические параметры анодного окисления хлорид-ионов в растворе KCl, подкисленном HCl (рН=2), на платиновом электроде с окисленной (Ptox) и восстановленной (Ptred) поверхностью. Предварительная обработка электродной поверхности состояла в 20-кратном циклировании электродного потенциа…
In this work the results of the mathematical planning of properties of superficial layers are rotined on details from different brands, inflicted in the conditions of self-propagating high temperature synthesis, the pictures of surface of the work-hardened details are resulted.
The aircraft engine continuous airworthiness method in the course of the life cycle has been reviewed. The European Certification System has been reviewed in detail. The certification basis development principles have been provided. The system of aircraft engine configuration management in the course of the life cycle…
Thin films of Mn2O3 doped with Cu have been fabricated using the simplest and cheapest chemical spray pyrolysis technique onto a glass substrate heated up to 250 oC. Transmittance and absorptance spectra were studied in the wavelength range (300 -1100) nm. The average transmittance at low energy was about 60% and decr…