Materials Literature
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The results of experimental studies of the strength of the normal sections of rubcon-concrete two-layer bending building structures are presented in the paper.Studies of two-layer rubcon-concrete bending structures were carried out in connection with the need for effective building structures, designed for use in corr…
Tämän työn tavoitteena oli suunnitella flyback-muuntajat kahdelle flyback-teholähteelle, jotka ovat osa aurinkosähkövaihtosuuntaajan apujänniteteholähdettä. Suunnittelussa tuli erityisesti kiinnittää huomiota komponenttien kustannustehokkuuteen sekä toiminnan luotettavuuteen. Suunniteltavien komponenttien toiminnasta…
The master’s thesis was done for Metso Automation’s valve factories in Finland and China. Firstly, the thesis introduces the reader to the construction of a butterfly valve and explains what its purpose in pipelines is. In addition, the design of a seat ring is presented and a basic sealing mechanism is explained thro…
The article describes the modern methods of steel ingot solidification process. Based on the analysis of these methods was developed a new complex method of steel ingot solidification research, which allows to analyze the evolution of both horizontal and vertical solidification fronts, as well as the length of the two…
In the article dependence is shown, characterizing a dynamics masses of loading of container taking into account his speeds and accelerations in extreme positions of debalance and determine the burst and minimum performance of process of oscillation treatment
One of methods increase of coefficient fusion of an electrode wire is influence of a transverse magnetic field (TMF). Data on influence of a longitudinal magnetic field are known. However influence of frequency of TMF on coefficient of fusion of ferromagnetic and not magnetic materials at arc welding and a submerged a…
Silicon surfaces of multicrystalline substrates before and after the formation of porous silicon on them, used in the production of photovoltaic cells were studied by mass spectrometry methods. An analysis of the elemental surface composition by mass spectroscopy of secondary ions at various manufacturing stages, incl…
In the literature, there are experimental studies, confirming the significant effect of the degree of concentration of the active components of corrosive medium on the corrosion process. These results are presented in tables and graphs that describe the dependencies of the time before corrosion damage on the mechanica…
The microstructure and phase elements distribution in Mg-modified complex-alloyed white cast iron (3.3 % C, 5.3 %V, 4.6 % Cr, 4.1 % Mn, 1.5 % Ni) are studied in present work. The investigation was carried out using metallographic and energy-dispersive spectroscopy analyzes. In as-cast condition the cast iron contains…
We have studied the ways of increasing the durability of low-alloy structural ferrite-pearlite steels and researched their possible effective use in a grade composition. The statistic processing of an array of industrial smelts has proved possible increasing of the durability owing to both solid-solution strengthening…
The results of the investigation of submerged arc surfacing using composite strip electrode to obtain the multilayer composition are presented. The influence of the shape and size of composite strip electrode, flux content, and the value of total welding current on the value of bypass current, operating conditions, an…
This thesis aims to demonstrate through silicon via (TSV) fabrication in semiconductor applications, the generic reliability issues concerning copper TSVs and novel approaches to handle these issues. The TSV is the key enabling technology for three-dimensional electronics (Chapter 1&2). It permits vertical connections…
Some acoustic stringed instruments have been designed for quiet environments, and they do not produce sound loud enough for today’s noisy environment. The human ear perceives high-frequency sounds louder than lower ones. Thus, mechanical distorters have been designed to transfer energy from the low end of the spectrum…
Sähkön ja lämmön yhteistuotannossa olevalle kaasukombivoimalaitokselle syntyy tarve joustavaan käyttöön, kun sekä sähkön hinta että kaukolämmön kulutus vaihtelevat merkittävästi jopa yhden päivän aikana. Kaikki peruskuormasta poikkeavat ajotilanteet voidaan määritellä joustavaksi käytöksi. Kombivoimalaitoksella voidaa…
In the article creation of mathematical model of research of influence of speeds and accelerations of elements of working environment is shown in the different areas of container through equalizations of dynamics of motion of container, design of motion of elements of loading taking into account configuration of conta…
Based on the studies, the influence of plasticizer and polystyrene modifier nature on the physicomechanical, thermophysical and physicochemical properties of PVC plasticates was determined. With the increase in the polystyrene modifier content, the surface hardness, Vicat softening temperature and value of composites…
We have studied erosion of nichrome, titanium, titanium nitride, chrome, and chrome carbide coatings impacted by cavitation. The coatings are obtained by applying plasmatron, detonation, vacuum and arc as well as atomic and ionic sedimentation methods. Ultra-sound cavitation was created in water; the fluctuation ampli…
Paper-based microfluidic sensors are becoming very popular in applications requiring chemical analysis. This thesis deals with preliminary surface chemistry studies which form the foundation for development of cellulosic microfluidic devices. Nanocellulose was chosen as the substrate and alkylsilanes were used to modi…
In the article problems are shown at the production of lowsilicon steel and the ways of decision of some problems are presented
Tässä diplomityössä tarkastellaan jauhemaisten kalsiumkarbonaattien toimivuutta typenpoiston alkalointikemikaaleina yhdyskuntien jätevesien puhdistuksessa. Suomessa alkalointikemikaaleina on perinteisesti käytetty soodaa, lipeää, poltettua tai sammutettua kalkkia. Perinteisten alkalointikemikaalien käyttöön liittyy mu…