Materials Literature
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Secondary minerals, formed at low temperature, are the product of the oxidation of primary sulphide ore bodies. The formation and mineralogy of oxidized zones, which phases are stable and which are not, and how toxic heavy metals become incorporated into the crystal structures of the constituent minerals have implicat…
This project is about the study on factors affecting corrosion resistance of stainless steels. The main objectives of this study are to observe the microstructure changes of stainless steels and also to determine at what changes take place in the stainless steels when subjected to high temperature (250°C - 1000°C). Al…
A novel graft copolymer consisting of a poly(vinylidene fluoride-co-chlorotrifluoroethylene) backbone and poly (glycidyl methacrylate) side chains, that is, P(VDF-co-CTFE)-g-PGMA, was synthesized through atom transfer radical polymerization (ATRP) using CTFE units as a macroinitiator. Successful synthesis and micropha…
The behavior and performance of lightning protective devices such as the metal oxide varistor (MOV) under the application of multiple lightning impulses are different from that of the standard single stroke test. Since the MOV is the most common, economical and reliable device for low voltage and telecommunication sys…
Разработана классификация и проведен анализ различных способов и устройств для очистки сжатого воздуха пневмосистем мобильных машин, отмечены их преимущества и недостатки. Приведены результаты исследований устройства очистки троллейбуса АКСМ 201.
Die Fertigungsprozesse von Kautschukmischungen zur Herstellung von Reifenbauteilen beeinflussen wesentlich die Leistung und Qualität der Reifen. Einer der Standardprozesse ist das Mischen von Kieselsäure mit Organosilan und Kautschuk im Innenmischer. Auf Grund der stattfindenden chemischen Reaktion zwischen der Kiesel…
We study the structural and dynamical properties of a two-dimensional (2D) classical bi-layer crystal of charged magnetic dipolar particles in a setup where the dipoles are oriented perpendicular to the layers and equal density of charged dipolar particles in each layer. The energy of the system is due to the charge -…
The DISCO-H test facility was used to perform scaled experiments that simulate melt ejection scenarios under low system pressure in Severe Accidents in Pressurized Water Reactors (PWR). These experiments are designed to investigate the fluid-dynamic, thermal and chemical processes during melt ejection out of a breach…
Polymer electrolytes composed of a blend of poly (vinyl chloride) (PVC) and poly (ethyl methacrylate) (PEMA) as a host polymer, LiBF4 as a salt and SiCO2 as a filler was prepared by solution casting technique with tetrahydrofuran (THF) as solvent. The conductivity measurement of the samples was carried out by using a…
Recently, required performance levels of antireflective coatings are becoming higher in technical fields of camera lens. We succeeded in forming antireflective coatings with ultra-low refractive index layers and achieving superior performances by sol-gel method.
Ultrasonic longitudinal and shear velocities at 9MHz were measured using pulse-echo overlap techniques in temperature ranges of 80-280K and 80-220K, respectively, in EuBa2Cu3O7-δ +ywt.% AI2O3 (y = 0, O(quenched), 0.2 and 0.4) superconductors. A steplike elastic anomaly indicating sudden lattice stiffening was observed…
Für die Reibung in umformtechnischen Prozessen spielt der Kontaktzustand zwischen Werkstock und Werkzeug eine herausragende Rolle. Deshalb werden in dieser Arbeit der Kontaktzustand unter Grenzreibungsbedingungen sowie der Schmierstoffeinfluss darauf grundlegend charakterisiert. Diese Erkenntnisse schaffen die Basis f…
В статье изложены новые методы типизации, унификации, модернизации, позволяющие снизить себестоимость производства и осуществить прогноз устойчивой конкурентоспособности на рынке се- мейства колесных тракторов «Беларус».
Vienas iš šiuolaikinės polimerų chemijos uždavinių – gauti numatytos molekulinės masės ir architektūros polimerines medžiagas. Neseniai buvo sukurti nauji radikalinės polimerizacijos metodai, kurie priskiriami gyvybingajai (valdomai) polimerizacijai (GRP). Makromonomerų (MM) gyvybingoji radikalinė polimerizacija yra e…
Fourteen compounds were isolated from the roots of Cynanchum auriculatum and their chemical structures were identified as β-sitosterol (1), acetovanillone (2), p-hydroxyacetophenone (3), 2,4-dihydroxyacetophenone (4), 2,5-dihydroxyacetophenone (5), cynandione A (6), methyleugenol (7), daucosterol (8), Succinic acid (9…
В статье рассмотрены механизмы модификации структуры однокарбидных твердых сплавов типа ВК8, приводящие к повышению поверхностной твердости и износостойкости инструментов. Представлены результаты сканирующей электронной микроскопии и рентгенофазового анализа.
The redistribution of radioisotopes found in some industrial by-products, by the increasing of the natural radioactivity, represents a serious problem for the health and for the atmosphere. The production of phosphoric acid from natural phosphate rock by the wet process gives rise an industrial by-product called phosp…
Crystals of BSO doped with Se are successfully grown by the Czochralski method. The measured concentration of Se is 1.75×1018 cm−3 and of Fe is 6.4×1018 cm−3, i.e. the concentration of Fe is significantly increased. It is assumed that the doping takes place through the replacement 3Si4+→(Se6++2Fe3+). The doping‐induce…
The study of glasses in ternary zinc magnesium chloro phosphate- (MgCl)x(ZnO)0.2(P2O5)0.8-X system will be carried out at room temperature. In the addition of magnesium chloride (MgCl) to the system it will modified the glass properties in his work the ion magnesium chloride for x=0.1, 0.2 and 0.3 will be doped to the…
Die Arbeit beinhaltet einen Vielteilchenansatz für magnetische, ferroelektrische und multiferroische Materialien. Wohingegen der Hauptteil der Arbeit sich mit quantenmechanischen Modellen beschäftigt, wurde im ersten Teil eine klassische Variante des transversalen Ising-Modells studiert. Die Elementaranregungen wurden…