Natural gases have played a significant role in different sectors of the global economy. Recent analyses shown that world's gas consumption doubled over last three decades; further growth is predicted, rising to be 23%–28% total primary energy demand by 2030. Therefore, liquefaction natural rapidly gains importance. In this context, magnetic refrigeration emerges as modern energy-saving technique, which an alternative traditional gas-compression refrigeration. This paper devoted study...

We report on specific heat and magnetic properties of thin Gd sheets obtained by means a cold rolling technique. At temperatures well below Curie temperature TC, the has minor impact Cp. However, defined λ-type anomaly Cp seen in vicinity TC polycrystalline sample is markedly suppressed severely deformed samples. Depression λ peak due to large decrease magnetization that presumably originates local anisotropy induced severe plastic deformation. Results calculation magnetocaloric effect from...

We report on the magnetic and magnetocaloric properties of Terbium ribbons subjected by cold rolling. The entropy change ΔS = 8.66 J/(kg·K) adiabatic temperature ΔT 4.38 K for a bulk sample in an external field 1.9 T are larger about 12% 26% respectively, than those values rolled Terbium. changes fully reversible can be restored additional annealing.

This work has considered the modern ideas on mechanism of surface modification for used nanodispersed inorganic modifiers with an acidic surface, which significantly affect hydrate and transport properties polymeric proton-conducting electrolytes. Authors have proposed alternative approach consisting synthesis new composite nanoscale systems characterized by high ionic conductivity developed a method obtaining materials "core-shell" structure based proton conductor (polyantimonic acid)...

The corrosion behavior of the diffusion zinc coatings based on δ-phase FeZn7-10 in a solution 3 wt.%NaCl water was studied using electrochemical and physicochemical methods.Initial involves selective dissolution from δ-phase.As exposure duration increases, both components coating alloy dissolve.The nature properties product layer were under conditions simultaneous components.Iron can accumulate products during prolonged coatings.In this case, chemical composition electrolyte near electrode...

In this work we report the results of investigation magnetocaloric effect in Gd 100- x Y ( = 0, 5, 10, 15) cold rolled ribbons. It is shown that exists within a wide temperature interval 258-295 K and it comparable with observed bulk samples pure gadolinium. The value reduced comparison strongly depends on degree plastic deformation. High heat treatment can restore ribbons up to initial ones. Thus, rolling proposed be promising technique for producing thin forms materials exchangers magnetic...

We report on magnetic properties of Fe-Ni-Ti alloys after severe plastic deformation (SPD) by high-pressure torsion (HPT) and low-temperature annealing. SPD annealing considerably change the magnetization behavior. The main structural characteristics bulk HPT materials were determined. addition small amounts Ti at 300 °C will not lead to formation L1 <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> structure even with use technique.

This paper presents results of experimental studies magnetic and magnetocaloric properties as-cast polycrystalline samples a Gd2In intermetallic compound, which crystallizes into hexagonal structure the Ni2In type. Measurements field temperature dependences magnetization carried out in range from 50 to 300 K fields up 3 T showed that undergo ferromagnetic ordering upon cooling below Curie ТС =194 K. With further cooling, metamagnetic transition an antiferromagnetic phase is observed at Tm =...

In this work we report on the results of investigation magnetocaloric eect in Gd100-xYx (x = 0, 5, 10, 15) cold rolled ribbons.It is shown that exists within a wide temperature interval 258-295 K and comparable with observed bulk samples pure gadolinium.The value reduced as compared strongly depends degree plastic deformation.Heat treatment procedures can restore values ribbons up to initial ones.Thus, rolling proposed be promising technique for producing thin forms materials heat exchangers...

In this work we report the results of experimental investigation magnetocaloric effect in Gd 100- x Zr ( = 0, 1, 2, 3) cold rolled ribbons. As it is shown exist within large temperature interval 279-295 K and comparable with observed on pure Gd. rolling one promising techniques for producing thin forms materials heat exchangers magnetic cooling devices.

In this work we report the results of experimental investigation magnetocaloric effect in Gd 90 Ga 10 cold rolled ribbons. A moderate entropy change ΔS = 3.5 J/(kg·K) and Δ T 3.4K was observed for as-cast materials an external magnetic field 2T which is less by 35% comparison with pure gadolinium metal. It found that a significant (up to 70%) depression magnetization properties developed course plastic deformation can be completely restored means high temperature heat treatment.

Dysprosium possesses the highest magnetic moment among rare-earth elements and undergoes a second-order phase transition to complex helical antiferromagnetic ordering at Néel temperature TN = 180 K which is followed by transformation ferromagnetic lower temperature. Superior properties tunability of temperatures make Dy its solid solutions perspective for use in technology refrigeration cryogenic temperatures, specifically liquefaction natural gases. In this work we report on evolution...

Tetrataenite (L10-FeNi) is a promising candidate for use as permanent magnet free of rare-earth elements because its favorable properties such high magnetic anisotropy and coercivity. We report on structural Fe49Ni49Ti2 alloy after severe plastic deformation (SPD) by pressure torsion (HPT) technique. The main characteristics bulk HPT materials were determined. As result deformation, all samples obtained with concentration defects stressed state. Low-temperature annealing was used to...

Tungsten antimony acids (TAA) with the composition H(2)Sb(2)WXO6·nH2O (0 &lt; x ≤ 1.45; 0 n 2.0) have been synthesized by hydrolysis of trichloride pre-oxidized nitric acid in presence varying amounts Na2WO4. To obtain TAA protonated forms, samples were kept a 96% solution sulphuric acid, precipitate was washed until reaction became neutral and dried air. The amount tungsten, antimony, silver ions determined using energy dispersive analysis. Changes structural parameters upon doping AA...

Coatings based on NiZn and CoZn alloys were obtained by combining electrodeposition diffusion galvanizing methods. The coatings are homogeneous uniform, the zinc concentration is between 85.0 to 89.5 at. %, consist of intermetallic phases CoZn, mainly γ-Ni2Zn11 γ2-CoZn13. Alkaline etching accompanied selective dissolution zinc, rate increases with time. This dealloying a change in morphology - cracks, pits, pores considerable depth formed. These defects contribute formation galvanic coupling...

The aim of the research is to design an extensive lesson plan for foreign students learning Russian. teaching materials are based on song “Smile” (lyrics by M. Plyatskovsky, music V. Shainsky) from cartoon “Baby Raccoon” and include exercises practice listening, speaking, reading, writing skills, as well exposure culture country. authors use a specific example demonstrate importance interactive form learning, provide main results experiment. study involved humanities South Ural State...

The study is devoted to the investigation of processes occurring during heating biochar, electric arc furnace (EAF) dust and their mixture at different EAF dust/biochar ratios in an inert atmosphere temperatures up 1000 °C. = 70/30, 50/50, 30/70 were considered. According X-ray phase analysis, contains phases Zn0,2Fe0,8Fe2O4 C. Biochar amorphous carbon with CaCO3. Taking into account data thermal analysis pure components (EDF biochar), including flue gas elemental data, reduction biochar are...

Modern education is inextricably linked with the intensification of educational process; classical methods are actively complemented by innovative working students. Partnerships between Russian and foreign universities rapidly developing, number students increasing. The organization productive structure process creation a favorable psychological climate for coming to Russia, as well formation communicative competence, become priority tasks training. This article presents experience teaching...

Diffusion galvanizing is widely used in the pipe industry for coating threaded surface of couplings, protecting water and gas pipelines, other metal products. coatings have a number advantages over types zinc coatings. In this work, electrochemical gravimetric methods are to study corrosion behavior diffusion sodium chloride solutions. The rate depends non-linearly on thickness coating. At initial stages, structure phases surface, with an increase holding time, greater extent properties...