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。
The fluorescence spectra of Y2O3:Eu3+ nanoparticles have been measured under the pressure of up to 78 kbar at room temperature. In this pressure range, a red-shift of 0.02(1) nm/kbar−1 is noticed for the 0–2 line (5D0→7F2 transition). This shift is explained by the change of negative charge of the surrounding ligands.…
Contamination flashover as a result of pollution severity leading to costly outages plagues insulator performance. Apart from the problem of flashover, failure of insulators as a result of ageing has also lead to service disruption. Leakage current (LC) is a good measure of insulator surface condition and thus its mag…
The processes of phase formation in the Na 2 CO 3 -TiO 2 and Na 2 CO 3 -TiO 2 -Nd 2 O 3 systems are investigated in the temperature range 600–900°C. The high-temperature solid-phase reactions underlying the process of formation of complex oxide NaNdTiO4 are studied. It is established that the synthesis of the NaNdTiO…
Abstract Two kinds of polyvinyl chloride (PVC)/organophilic montmorillonite (OMT) nanocomposites are prepared by a melt intercalation method. This study has been designed to determine if the presence of iron and zinc ions in the structure of montmorillonite (MMT) lattice can affect thermal, flame retardant and smoke s…
The oxygen-ion conductivity of porous materials, the coarse-grained pyrochlore-like Sm 2 Ti 2 O 7 and fine-grained Sm 2 TiO 5 compounds, produced by mechanical activation of initial oxides is studied at 400–1000 °C. The Sm 2 TiO 5 samples contain ∼15 wt % of the nanosized pyrochlore-like Sm 2 TiO 5 phase in addition t…
Dry synthesis of KAlSiO4 at temperatures from 900 to 1500°C yielded products with slightly different powder X-ray-diffraction patterns. “Orthorhombic” KxAlxSi2–xO4-O1 with x ≈ 1 was obtained as a substantially single phase after heating at 1000°C for one day; we refined its crystal structure from powder X-ray-diffract…
Abstract The structure and defect formation energies of the K‐doped CuN 3 were studied using density functional theory within the generalized gradient approximation. The results show that the K‐doping breaks the azide symmetry and causes asymmetric atomic displacement. As the K‐doping level increases, the band gap of…
THIS PAPER PRESENTS A DETAILED INVESTIGATION OF ENERGY ABSORPTION CHARACTERISTICS OF THIN SINGLE AS WELL AS LAYERED IN-CONTACT ALUMINUM TARGET PLATES OF DIFFERENT THICKNESSES IMPACTED BY BLUNT, OGIVE AND HEMISPHERICAL NOSED STEEL PROJECTILES. INFLUENCE OF VARIOUS PARAMETERSA AFFECTING THE ENERGY ABSORPTION CAPACITY OF…
In the oil field, due to the extensive use of water injection for oil displacement and pressure maintenance, many reservoirs experience the problem of scale deposition when injection water begins to break through. Experience in the oil industry has indicated that many oil wells have suffered flow restriction because o…
The use of different materials as metals, wood and other modern materials like composites, require a previous evaluation of its performance under corrosion, creep, tension, compression, bending and fatigue. In general, these requirements lead to a few number of materials to choose during the project of one component,…
Este trabalho teve como objetivo avaliar as propriedades de chapas de madeira aglomerada fabricadas com partículas de Eucalyptus urophylla (massa específica = 0,55 g/cm³) e de Schizolobium amazonicum (Paricá) (massa específica = 0,30 g/cm³). Foram confeccionadas chapas com cinco proporções de madeira e dois tipos de p…
This contribution deals with a few topics closely related to the superconductivity in the heavily boron-doped diamond which are, in our opinion, not properly treated in the current literature. Attention is paid especially to the classification of metallic and insulating state, selection of pairing mechanism, limits of…
Density functional theory calculations are performed to study the structural, electronic, and magnetic properties of hexagonal NiAs type and cubic zinc blende type CrSe structures and interface of zinc blende CrSe with ZnSe(001). We observe that the local density approximation to the exchange correlation energy leads…
Natural cellulose was treated by an atmospheric DBD plasma. The solubility of cellulose in a diluted alkaline solution after the plasma treatment was investigated. The properties were characterized by X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscop…
A natural sample of anorthoclase of composition Na0.63 K0.27Ca0.10 Al1.10 Si2.90O8 (Ab63 Or27An10) was treated at T = 950°C for one week, and then investigated by single-crystal X-ray diffraction in situ at high pressure using a diamond-anvil cell. After the thermal treatment, the unit-cell parameters at room pressure…
The dielectric properties of polymer composites on the basis of polyethylene and polypropylene with TlInS 2 semiconductor filler are investigated. It is shown that the changes in these properties that were observed are caused by polarization processes occurring on the polymer-filler interface.
Catalysts with the formula of LaCo(1+x)O(3+δ), where 0 ≤ x ≤ 1, were studied for oxidation of CO and C2H6 in a synthetic exhaust gas, comprising 6.0 % CO and 0.2 % C2H6 in Ar. Ethane was selected as a model for hydrocarbons in the exhaust gas. The performance of catalysts is correlated to their properties, particularl…
Microstructures associated with the ferroelectric (FE) properties in (1-x)BiFeO 3 -xBaTiO 3 were investigated mainly by a transmission electron microscopy. It was found that large FE domains in BiFeO 3 changed into complicated FE microdomains with the 20–30 nm width in the x = 0.25 compound. The directions of the spon…
The present investigation is aimed at processing a composite using fly ash, jute with epoxy (binder) and to study its weathering behaviour on mechanical properties such as flexural strength. The fracture surfaces of the specimen are examined under scanning electron microscope. From the study, it appears that fiber pul…
Abstract For several years, Cr IV compounds were used as effective and inexpensive corrosion inhibitors. Studies showed that these materials were toxic and carcinogenic. This has led to extensive research to develop alternative inhibitors. Organo‐silicate hybrid coatings appeared as an effective technique for forming…