Materials Literature
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We report on a spin-polarized inelastic neutron scattering study of spin waves in the antiferromagnetically ordered state of BaFe2As2. Three distinct excitation components are identified, with spins fluctuating along the c-axis, perpendicular to the ordering direction in the ab-plane, and parallel to the ordering dire…
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A Madeira Laminada Colada (MLC), que e um conjunto de lamelas de madeira coladas umas sobre as outras por meio de adesivo estrutural, e um dos principais produtos a base de madeira para a construcao civil. A madeira e um material influenciado pelo teor de umidade do local onde esta sendo utilizada, por isso, sao neces…
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This paper examines the key features of photoconduction in films of II–VI based solid solutions and the influence of deposition and heat-treatment conditions and anion substitutions on the photoconductivity of the films. A mechanism is proposed for the formation and dissociation of donor-donor and donor-acceptor pairs…
We have studied a soft-magnetic amorphous alloy with the optimal composition Fe 76.5 P 13.6 Si 4.8 Mn 2.4 V 0.2 C 2.5 , prepared using ferrophosphorus. The results demonstrate that the electrochemical characteristics of the alloy in the amorphous state and after relaxation are comparable to those of a commercially ava…
The new (Hpyz)3Co(μ2-pyz)3Co complex has been isolated as the nitrate salt through a reaction of Co(II) nitrate, Hpyz (pyrazole), triethylamine, and oxygen. The salt crystallizes in the monoclinic space group P21/m with a = 12.5977(3) Å, b = 15.3387(4) Å, c = 14.0800(3) Å, β = 93.0868(15)°, and = 1.464 g/cm3 at 150(1)…
Analysis presented in this paper indicates that the anhydrous residues of faujasite in composition pyramid lie close to the ideal compositions AB 2 Al 4 Si 10 O 28 and A 2 B 2 Al 6 Si 15 O 42 and that the water content of the zeolite depends on its origin. In the “AAl 2 O 4 ”-“BAlO 2 ”-SiO 2 -H 2 O composition pyramid…
Thin SnO 2 films grown by pulsed laser deposition have been characterized by X-ray diffraction, optical spectroscopy, and scanning electron microscopy. The carrier mobility and concentration in the films have been determined as functions of target composition (0–8 at % Sb) using Hall effect measurements, and the resis…
We have produced PTC thermistors from conventional and ultrasound activated barium titanate powders and have shown that the use of activated starting materials is an effective approach for improving the performance of PTC thermistors.
We have studied the effect of excess tellurium atoms (up to 0.5 at %) on the thermal conductivity of single-crystal Pb1 − x Mn x Te (x = 0.04) samples annealed at 570K for 120 h. We have evaluated the lattice and electron thermal conductivities of the samples, their additional thermal resistance due to structural defe…
With the aging of the population and a correlated increase in the incidence of osteoarticular damage, great attention is focused on regenerative nanomedicine solutions to restore durable articular function and comfort. A durable cartilage repair is not effective without regeneration of an intact subchondral bed along…
比较了几种典型的沸石分子筛在氯甲烷转化制乙烯、丙烯和丁烯等低碳烯烃反应中的催化性能,发现H-ZSM-34具有较佳的催化活性和选择性.经乙二胺四乙酸二钠(Na2H2EDTA)水溶液处理,并经离子交换及焙烧后,H-ZSM-34上氯甲烷转化制低碳烯烃的催化性能显著改善.当Na2H2EDTA浓度为0.1 mol/L,反应温度为673 K,CH3Cl分压9.2 kPa时,C2–C4烯烃选择性和收率分别达82%和61%.研究还发现,Ce修饰H-ZSM-34催化剂同样可改善氯甲烷制低碳烯烃的选择性和收率.表征结果表明,Na2H2EDTA处理和Ce修饰均降低了H-ZSM-34的酸性.酸性的降低可抑制低碳烯烃的氢转移反应,继而避免了其进一步转化为低…
We have studied a process for the preparation of apatite precursors through calcium carbonate conversion into dicalcium phosphate dihydrate, which is then hydrolyzed to octacalcium phosphate. The process enables the preparation of both phase-pure octacalcium phosphate and calcium phosphate mixtures with variable dical…
Ionic mobility and electrical transport in the 50PbF 2 · 30BiF 3 · 20NaF fluorite solid solution have been studied by 19 F and 23 Na NMR and impedance spectroscopy. Analysis of the NMR spectra allowed us to assess the temperature effect on the nature of ion motion in the fluorine and sodium sublattices, to identify th…
Transthyretin (TTR) is a tetrameric protein. TTR misfolding and aggregation are associated with human amyloid diseases. Dissociation of the TTR tetramer is believed to be the rate-limiting step in the amyloid fibril formation cascade. Low pH is known to promote dissociation into monomer and the formation of amyloid fi…
TiN-Cu metal-ceramic coatings grown by vacuum arc PVD and containing 0–20 at % copper consist of titanium nitride and copper, which is X-ray amorphous up to 10 at % Cu. The presence of copper in the coatings reduces the crystallite size of the nitride phase from 100 to 20 nm. The hardness of the coatings increases fro…
Magnetostrictive waveguide position sensor (MPS) is widely used in industry for position measurement and monitoring. Generally, the generation mechanism of MPS signal is just roughly attributed to the inverse magnetostrictive effect. In this paper, we introduce a novel model of MPS signal generation mechanism which co…
The interaction between vanadyl porphyrins and asphaltene in alkane solvents is important to increase the removal rate of metals during the solvent deasphalting process. Thus, the adsorption kinetics and thermodynamics of vanadyl etioporphyrins on a Canadian oil sands bitumen vacuum tower bottom (VTB) asphaltene in n…