Materials Literature
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Primary precipitation phases in amorphous Fe-Si-B-Nb alloys with compositions around FINEMET and bulk amorphous alloys have been investigated. On the base of new and previous TEM and XRD results concentration areas and condition for formation of the metastable phases have been determined. Role of the primary metastabl…
Poly(3-hydroxyalkanoate) (PHA) is a class of biodegradable polyesters that is accumulated by a large number of bacteria as carbon storage compound under nutrient limited growth conditions. PHA with side-chains of medium-chain-length (mcl-PHA) represents a promising class of polymers because of its broad spectrum of ph…
The elastic wave velocities of MORB glass were measured up to 18.7 GPa at 27 °C using an ultrasonic technique combined with in situ high-pressure X-ray diffraction and imaging. High-pressure Raman spectroscopy using a diamond anvil cell was also employed to study the local structure of the glass sample up to 20 GPa. B…
We propose a system which consists of a nanotube probe and the rigid and static nanostring internal like a pitchfork. The simulation was made by classic molecular dynamics with standard parameterization. We calculated thermodynamic properties of these devices as molar specific heat and entropy variation. These facts c…
This paper presents results of a detailed investigation into the qualitative composition of the desmid flora of the Danube performed from April of 2002 to May of 2003. A total of 70 desmid taxa belonging to four genera were recorded. Forty-seven taxa are new to the Vojvodina stretch of the Danube, while Cosmarium kjel…
As escórias de siderurgia representam uma alternativa recomendável em substituição às fontes tradicionais de corretivos ou fertilizantes. Este trabalho objetivou avaliar diferentes níveis de saturação por bases, utilizando escória de siderurgia, comparando-a com calcário dolomítico na correção da acidez do solo e na d…
Abstract—Polymers are becoming the material of choice for high voltage outdoor insulators. However being mostly organic, they are susceptible to aging and degradation (weathering) due to environmental (and electrical) stresses. This necessitates the study of their long-term behavior. It is desirable to study the long-…
Bestrahlungsprogramm HFR Phase IIb – SPICE: Kerbschlagbiegeuntersuchungen an bis 16.3 dpa bestrahlten RAFM Stählen Die Untersuchung des bestrahlungsinduzierten Versprödungsverhaltens von niedrigaktivierbaren ferritisch-martensitischen (RAFM) Stählen bildet das Ziel der vorliegenden Arbeit. Die Neutronenbestrahlung bei…
The present work has investigated whether the twin boundaries to be accounted or not in the Hall-Petch equation for polycrystalline metals. Pure copper, Cu-3.5at%Al, Cu-6.8at%Al and Cu-14.8at%Al alloys, which have the average grain sizes from 8.4μm to 176.0μm and different ratio of annealing twins, were produced and p…
The Au-In-Sb system belongs to the group of potential candidates for lead-free solder materials. The results of phase equilibria investigation and characterization of the alloys in the Au-In-Sb section are presented in this paper. The investigations were performed using different experimental methods - thermal analysi…
Magnesium is a mineral residue in the high-temperature metastable structure,activity in the structure of the cation,magnesium slag itself with very high activity hydration,hydration could be the last generation calcium silicate gel.Magnesium slag as a base cementitious materials is feasible,magnesium residue 4-more lo…
By using pyrophyllite and natural graphite as raw materials, SiC–Al2O3 refractory composite powder were synthesized with the carbothermal reduction method. The effect of heating temperature on the synthesis was investigated and the synthesis process was studied by thermodynamic analysis as well. The results indicate t…
Since the 1990s, duplex stainless steels have been gaining ground over austenitics. Cost is only one factor: improved metallurgical techniques, improved weldability and greater availability of products have also played a role. Duplex alloys are now generally accepted as an efficient solution for corrosion issues in a…
Fluorescent solar concentrators are but one candidate for lowering the costs of photovoltaic technology. Stateof- the-art device conversion efficiencies are around 4%, and the device configuration can be optimized in terms of Euro per Watt. This paper aims to estimate the annual energy yield of such an optimized devic…
In this work the results of research connected with the problem of determination of the temperature at the beginning of the alloy layer forming process on the steel cast were presented. It was shown that diffusion of chromium, carbon and iron, between the material of the premould made of grainy, high – carbon ferrochr…
Controlled doping appropriate elements into semiconductor nanostructures is of vital importance to develop novel materials and functional devices. Herein, we present three methods to synthesize Cu-doped ZnO nanostructures using a simple vapor phase transport process and adopting CuCl2, CuO or Cu as doping precursors.…
A multi-stage transformation (MST) has been observed in cold-worked Ti–50.3 at%Ni shape memory alloy by differential scanning calorimetry (DSC). When thickness reduction reaches about 5% strain, the phenomenon is able to occur in 50.3 at%Ni alloy. The multi-stage transformation behavior is due to interior microstructu…
The texture evolution of an as-extruded ZK60 Mg alloy with different tensile strains has been determined by X-ray diffraction technique. As strain increases, {0002} basal plane of most grains gradually inclines to the tensile direction, which is more pronounced for TD sample. This firmly suggests that the mechanical a…
For eventual commercial applications of singlewalled carbon nanotubes (SWNTs) in nanoscale devices, it will be very important to realize effective purification of SWNTs. We have developed a simple method to purify as-synthesized SWNTs by centrifugal force in an aqueous solution of sodium dodecyl sulfate (SDS). The met…
This paper presents the principles and the first results of a new and unique on-line partial discharge (PD) based diagnostic system for medium-voltage power cables, which enables monitoring the condition of complete cable connections up to several kilometers in length over a long period of time. It allows locating the…