Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Phase evolution and ferroelectric behavior in 0.8BaTiO3-(0.2-x) BiScO3-xPbTiO3 ceramics, x = 0-0.20, has been investigated in this paper. The phase assemblage and lattice parameters indicate the appearance of tetragonal-rhombohedral phase transition and the existence of a MPB region in the composition range x = 0.15-0…
Hydrogen effects on the electrical and optical properties of p-i-n ZnO light-emitting diodes (LEDs) were investigated. There were no diode characteristics or light emissions observed unless the structures were annealed at 350 ° C after fabrication. Annealed diodes showed bandedge electroluminescence (385 nm) and a bro…
Boron nitride (BN) nanohorns were fabricated, and their structures were investigated by transmission electron microscopy and molecular mechanics calculation. The multi-walled BN nanohorns would be stabilized by stacking of nanohorn structures. Growth of the BN nanohorn was observed at elevated temperatures, and the ac…
Small-angle X-ray scattering (SAXS) is an X-ray diffraction-based technique where a narrow collimated beam of X-rays is focused onto a sample and the scattered X-rays recorded by a detector. The pattern of the scattered X-rays carries information on the molecular structure of the material. As breast cancer is the most…
Diamond-like carbon (DLC) coating provides low friction properties without lubricants and, with lubricants, should provide super low friction. In this study, to find the possibility of the environment-friendly material combination that can provide super low friction (with a coefficient of friction lower than 0.01), th…
We report the design and realization of an integrated system for measuring, at the same time, the thermodynamic and spectroscopic features of nanoporous materials interesting for hydrogen storage purposes. The whole investigation cycle, from thermal activation to the actual investigation of uptake and release of hydro…
Idiomorphic and prismatic K 2 Nb 8 O 21 crystals were successfully grown by the isothermal evaporation of KCl flux. On the basis of their aspect ratio, the crystals were divided into two morphological types, that is, whisker (needle) and prism. Growth was induced by heating mixtures of KCl and Nb 2 O 5 at 1100 °C for…
The electrochemical characteristics of a mixture of Pt-black and WC powders and its catalytic activity for methanol and formic acid oxidation were investigated in acid solution. XRD and AFM measurements revealed that the WC powder employed for the investigation was a single-phase material consisting of crystallites/sp…
True stress (σ)–true strain (ε) curves were calculated by using the Kocks–Mecking (KM) model for the ferrite–cementite steels with various ferrite grain sizes between 0.47 and 13.6 μm. In the KM model, the effect of ferrite grain size on flow stress is described by the athermal stress component that follows the Hall–P…
最初に，ステンレス鋼の不働態皮膜の厚さ，組成，伝導形式，バンドギャップ，インピーダンス軌跡などに関する最近の成果を通覧し，皮膜の状態の電位による変化を明らかにする．ついで，不働態皮膜の厚さと組成を模擬した人工不働態皮膜の電気化学的性質について紹介し，この皮膜の電気化学的性質に基づいて不働態皮膜の塩化物孔食に対する防食能力について考察する．最後に，不働態皮膜を更に良く理解するために，幾つかの将来の課題を提案する．
Rayon fiber (RN) and pine wood fiber (PW) filled polypropylene (PP) compounds, PP/RN (90/05 and 75/25 wt%) and PP/PW (90/05, 75/25 and 50/50 wt%), are investigated for their interfacial adhesion, rheological properties, morphology, nucleation and mechanical properties. The interfacial adhesion of the RN-filled PP comp…
Three sets of data covering the 2004-2007 period are examined: two beryllium-7 series and ozone measured in ground level air. The measuring sites are at three different locations in Belgrade, Serbia. The temporal evolution of beryllium-7 and ozone is presented, as well as their mutual correlations. Beryllium-7 data fo…
The problem of re∞ection and transmission of plane electromagnetic waves in a periodic multilayered structure containing double-negative (DNG) media is analyzed using a matrix formalism. A Lorentz model with a single resonance is used to describe the dispersion of the DNG medium. It is shown that the introduction of l…
We have investigated the potential of the dithiolane ring to anchor organic compounds on the surface of CdSe–ZnS core–shell quantum dots. In particular, we have synthesized three monomeric ligands, incorporating an azobenzene chromophore and a single dithiolane anchor in their molecular skeleton, as well as a polymeri…
We describe a straight forward procedure that allows an easy purification, an efficient solubilisation and, if desired, a controlled cutting of carbon nanotubes. The method uses aqueous solutions of phosphomolybdic acid combined with ultrasound, leading to the adsorption of phosphomolybdate on the nanotubes. This gene…
Abstract Simple phenylthiourea compounds are known for their high solubility in alkaline medium and for good corrosion control. The monomer N ‐(4‐hydroxy‐3‐methoxybenzal)‐ N ′‐(4′‐hydroxyphenyl) thiourea was condensed with pimeloylchloride and azeloylchloride through inter‐facial polycondensation method to synthesize…
This paper reports on the hairiness reduction of polyester yarns at winding using air-nozzles. Three yarns of the same count were spun each from fibres of 1.0, 1.2 and 1.4 deniers respectively. Using a CFD (computational fluid dynamics) model, airflow inside the nozzles is simulated to explain the role of nozzle param…
Using first-principles calculations, we have studied successive adsorption of hydrogen atoms on a sp2-bonded boron nitride graphitic sheet. Our calculations show that clustering proceeds through the creation of contiguous H-H orthodimer structures stabilizing the H adsorbate cluster on the BN(0001) surface, leading ev…
A commercial alumina nanopowder has been applied to prepare high density alumina ceramic specimens using a simple slip casting method. Slurry preparation process is one of important steps to enhance density and optical property of alumina specimens to be fabricated. In this work, the effect of the amount of ammonium s…
A despolimerização do poli (tereftalato de etileno) - PET pós-consumo, em solução aquosa 7,5 mol.L-1 de hidróxido de sódio foi testado a 100 °C e a 1 atm, com objetivo de obter o ácido tereftálico. O efeito de tensoativos e da concentração da solução sobre o rendimento da despolimerização foi estudado quantitativament…