Materials Literature
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На основании результатов оптической спектроскопии и литературных данных обсуждена структура супрамолекулярных димеров азулена, ответственных за синюю окраску его кристаллов и растворов. Установлено, что два вида этих димеров (I и II) поглощают свет в красной области видимого (VIS) спектра и отличаются по взаимной орие…
Вивчено структурування полімерних сумішей на основі епоксидної смоли ЕД-20 у присутності реакційноздатних олігомерів,що містять пероксидну групу і ненасичений подвійний зв'язок та пероксидну й епоксидну групи. The crosslinking of polymeric mixtures based on epoxy resin ED-20 in presence of reactive oligomers containin…
System is set up for simple spray pyrolysis technology method, which allows spray two different precursor solutions (nitrates, metal-organics, etc) from two guns. Using this system thin films from single material or sandwich-type multi-layer films from two different materials can be obtained. Results about thin Co fer…
Calotropis procera é uma planta laticífera encontrada na Ásia, África e América do Sul. Este vegetal tem sido bastante utilizado na medicina tradicional para diversas patologias. Seu látex é rico em proteínas que apresentam relevantes atividades farmacológicas. O objetivo do presente estudo foi avaliar a atividade das…
The Establishment manger in need in this time for following the scientific study to evaluate the duty of the factory . This research aims to study the status of the factories which belong to construction fied in Iraq , as the systeme of oplication of ideal production mangment and evaluat the working duty of those fato…
Amorphous metals, i.e. without defined crystal structure; are increasingly used in modern life, showing great potential as advanced engineering materials, due to some of its characteristic properties such as high hardness and moldability, high resilience, high mechanical strength and high wear resistance, among others…
Semi-empirical methods (MINDO/3, PM3) and Density Functional Theory calculations (DFT/ B3LYP/ 6-311G) were carried out to evaluate the vibration frequencies and Infra-Red (IR) absorption intensities for equilibrium geometries, of 6,7,8,10 and 12 cyclacene's molecules of different diameters for (SWCNTs). The Gaussian 0…
Contact interaction between a cylinder shell and a band from composite material was considered within the classical theory of thin shells. Implementation of contact interaction schemes depending from geometric parameters of band and shell was studied.
A thorough damageability analysis of nozzle segments made of cobalt alloy FSX-414 has been performed during TVD operation. It was shown that the most typical defect of the segments is thermal fatigue cracking which decreases the life cycle of the machine parts. The most critical requirements to the repair technology h…
The paper is devoted to the description of the problem statement as well as the method of solution for creep problems of shells of revolution, which are in conditions of joint action of periodically varying temperatures and stresses. The creep-damage constitutive equations are given for this case. The example of numer…
Results of physical-chemical and structural researches of samples reached at experimentally four-componential alloys for the thermal barrier coatings blades of aviation gas turbines are presented. RFA and thermal analyses investigated phase transformations of an alloy of the new structure which results confirmed relia…
Відображені результати моделювання синусоїдного зачеплення для циліндричних зубчастих передач, зубчасті колеса у яких отримані методом обкату за допомогою косозубої рейки та способом радіально-колового формоутворення дисковою фрезою за неперервного ділення. The results of design of the sinewave type hooking are repres…
Проаналізовано методики розрахунку товщини теплоізоляційного прошарку конструкції дорожнього одягу для забезпечення морозостійкості земляного полотна, розглянуто існуючі методики розрахунку товщини теплоізоляційного шару дорожнього \nпокриття та запропоновано новітні підходи і методику виконання таких розрахунків з \n…
There was described the process of the formation of dent on the cylindrical shell by sphere impact. It was made a comparison of the stresses and straines formed by the impact and static contact interaction in the area of dent. The solution was made on basis of the finite-element analysis, with an allowance for physica…
본 연구에서는 석유계 폴리올을 대체하기 위하여 식물성 천연유인 피마자유를 개질한 천연유 기반 폴리올(Castor Oil based Polyol, COP)을 사용하여 폴리우레탄 폼을 합성하였다. 접촉각과 표면장력실험을 통해 계면활성제에 따른 석유계 폴리올과 COP와의 상용성을 측정하였다. 최적의 COP 함량과 계면활성제(surfactant)...
Low frequency oscillations of shells of revolution with two boundaries are considered. Various boundary conditions are specified for one boundary. The other boundary is rigidly connected with flexible planar annulus of a constant cross-section. The dependence of low frequencies on the form of boundary conditions at on…
Quantitative analysis of samples ion-plasma nitriding (hardness and width of the resulting surface layer) of ferritic chromium steels for the purpose of optimizing technology process using chemical and thermal treatment was done.
The problem of retention non-recrystallized grains elongated along rolling direction during processing of sheets of alloy TS6 (Ti-11Cr-5Mo-6V-3A1) exists for long time. By means of m etallographic, texture analyses and EBSD method, the formation and the retention of such grains was shown to be connected with texture i…
Silicomolybdic acid (H4SiMo12O40, SMA) is considered as an effective precursor for methane partial oxidation catalyst and an impregnation of supports into SMA solution is the conventional method to prepare supported SMA catalysts1)~4). Recently, M. H. Tran et al.5),6) reported the direct synthesis of silica supported…
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