Materials Literature
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Abstract The softening and the strength of the welded joints of high-temperature complex alloyed aluminum 1151 alloy sheets fabricated by friction stir welding and nonconsumable electrode welding are analyzed. The strain hardening of the 1151 alloy welds formed by friction stir welding provides a higher level of their…
The potential of the interaction between a C 60 fullerene molecule and a single-walled carbon nanotube is calculated. Using this potential, the equilibrium distance and binding energy as functions of the nanotube radius and the location of the molecule (inside and outside of the nanotube) are calculated. The minimum s…
Five Fe-Ga samples with gallium content ranging from 13.2 to 19.7 at. % are studied in this paper. X-ray phase analysis is carried out for the certification of the phase composition of the initial samples; in order to find differences in the chemical composition inside the grains and in the nearborder areas, elementar…
In view of the short comings of traditional synchronous machine transient model, in this paper, an accurate equivalent circuit modeling and parameter identification method is proposed. In this new modeling method, the phenomenon of unequal mutual reactance of different windings and the eddy current during transient pr…
Abstract The ionic (proton and deuteron) conductivity of the system CaZr1 – xScxO3 – α (x = 0.03–0.20) is studied experimentally in H2 + H2O + N2 and D2 + D2O + N2 reducing atmospheres at pH2O = pD2O = 3.2 kPa and in the temperature range of 600–900°C. This system exhibits a considerable H/D isotopic effect in conduct…
Abstract Pine wood is commonly used in the production of floorings and is mainly used for solid wood planks and as a base in multi-layer flooring material. From an economic and ecological point of view, flaws such as flattening or heartwood ratio are very important when buying material for production. 40 logs of Scots…
Thermo-electric generators (TEGs) have been identified as one of the most promising technologies use for automobile waste heat recovery due to its solid-state nature and its ability to convert thermal energy directly into electricity. Recent studies have shown that nearly 5% of the heat wasted from an automobile exhau…
Abstract We have studied luminescence of LiGaO 2 , Al 2 O 3 -Ga and Al 2 O 3 -Li crystals in order to reveal the nature of luminescence centres and mechanisms in these crystals. In Al 2 O 3 -Ga presence of Ga impurities determines occurrence of the 280 nm emission band, which demonstrates intra-centre character in pho…
Abstract This article presents a detail comparison of the thermal stability of the new magnesium phosphate (newberyite – MgHPO4·3H2O) coating with a conventional coating of zinc phosphate (hopeite – Zn3(PO4)2·4H2O). It was confirmed that dehydration of zinc phosphate (hopeite) occurs gradually (dehydration start tempe…
ABSTRACT There are two units with RBMK-1500 type reactors at the Ignalina Nuclear Power Plant (Ignalina NPP) in Lithuania where graphite was used as a neutron moderator and reflector. These reactors are now being decommissioned, and Lithuania has to find a solution for safe irradiated graphite disposal. It cannot be d…
The process of saturation of high-density polyethylene and polyethylene terephthalate with suband supercritical freons and supercritical carbon dioxide was investigated for the first time. The subcritical freon R22 was shown to be absorbed by these polymers in much larger amounts compared to subcritical freon R410a, a…
Along with the development of Permanent Magnet Synchronous Machine (PMSM), the variation of rotor temperature has become the main restriction of Electrical Vehicle (EV) motor design. In this paper, we mainly investigated the relationship between temperature and performance of the motor (output torque, efficiency map,…
Abstract Eddy current magnetic signature is, together with magnetization of ferromagnetic hull, mechanisms and devices on board, corrosion related and stray field sources one of the main sources of ship’s magnetic signature. Due to roll, pitch and yaw of the ship in external magnetic field, eddy currents are induced i…
This paper presents a robust control approach for a class of nonlinear dynamic systems consisting of a linear plant connected in series with a hysteresis operator, and affected by control input saturation. Such a class of systems commonly appears in applications concerning smart materials, in particular thermal shape…
Abstract The paper presents the results of application of a novel Barkhausen effect (BE) probe with adjustable magnetizing field direction for the stress level evaluation in ferromagnetic materials. The investigated sample was in a form of a pipe, made of P91 steel that was anisotropic due to the production process. T…
The effect of microstructural refinement and intercritical annealing on the mechanical properties and work-hardening response of a low carbon St12 steel was studied. It was revealed that intercritical annealing of the ferritic-pearlitic sheet results in the formation of a coarse-grained DP microstructure with discrete…
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A new class in the open unit disc of analytic p -valent functions is introduced in this paper. This subclass S^{ m,j}_{λ,p} ( a_ 1 ,b_ 1 ,α,β,A,B,γ ) is mainly defined by the generalized hypergeometric function. The majorization properties for the functions in this class are introduced. Moreover, we investigate the co…
The spectral problem of the internal mode oscillations of a spin nanocluster in an anisotropic ferromagnetic chain placed a magnetic field has been solved exactly using the discrete Takeno-Homma model. A stability diagram on the plane of exchange and magnetic field parameters is constructed for spin clusters having ar…
Glucose hydrogenation using water at solvent was happened trough two step.First, water was reduced to hydrogen and a oxygen gases by TiO 2 pillared bentonite.Second, hydrogen that produced was used to reduce glucose into sorbitol.The reaction was prepared in transparency medium for 30 days along under UV from sunlight…