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。
<abstract language="eng">The chemical composition of the ethanolic extract of the leaves and roots from Philodendron imbe Schott was investigated. The main constituents isolated the leaves were beta-sitosterol one polyprenoid hexaprenol, and 6beta-hydroxy-stigmast-4-en-3-one, a steroid, not yet reported in the Philode…
Abstract Pulsed discharges of methane gas at atmospheric pressure were generated using high voltage power supply (20 kV–25 kHz) to produce the carbon. The pulsed discharge of methane gas was generated between two sharp wolfram electrodes. It brings out carbon and acetylene and other hydrocarbons at the same time. In t…
We report on the effects of temperature and DC magnetic field on the modulated non-resonant microwave power absorption measurements at 8.8-9.8 GHz, in powder samples of iron niobate, FeNbO4 (FN), in the monoclinic phase (wolframite-structure). Two techniques recently implemented are used: magnetically modulated microw…
Phase transformations in the oxide binary section of the UO 2 -FeO-Fe ternary system were studied. The melting onset point of the UO 2 -FeO heterogeneous system (1335±5°C) was determined and the fusion curve of this system was constructed. The limiting solubility of FeO in the UO 2 solid solution was measured. The cha…
In a recent paper Wu et al. [J. Appl. Phys. 97, 103908 (2005)] reported on characteristic features of the temperature (T) dependence of electrical resistivity (ρ) in polycrystalline La0.7Ca0.3Mn1−xCrxO3 (x=0.05 and 0.1) manganites. In particular, a shallow minimum at T&lt;50K and coexisting two maxima were observe…
Article SYNTHESIS OF SUBSTITUTED FLAVONES AND ARYLCHROMONES USING Ρ AND Si KEGGIN HETEROPOLYACIDS AS CATALYSTS was published on February 1, 2007 in the journal Heterocyclic Communications (volume 13, issue 1).
The present paper reports the effect of oxygen activity p(O2) on Nb segregation in a polycrystalline specimen of Nb doped TiO2 (2·91 at.-%). The determined segregation induced enrichment factor following annealing at 1773 K in p(O2) = 10 Pa and p(O2) = 21 kPa is 3·1 and 7·3 respectively. The data on the effect of p(O2…
The Schiff condensation of 2-pyridinecarboxaldehyde N-oxide with 2-aminophenol gave a tridentate ligand, abbreviated as Hpoxap. This ligand bears the functionality of a terminating group in a trinuclear complex [Mn(poxap)Mn(ac)4Mn(poxap)], where ac- is the acetate bridge. The magnetic data were treated simultaneously…
In-pile flow-boiling experiments were performed to investigate the possible enhancement of heat transfer by the radiation induced surface activation (RISA) effect. The test section was a 2-mm diameter 100-mm long bore in a SUS-316L stainless steel block heated electrically. The test section, housed in an irradiation c…
A tunable capacitor based on a ferroelectric thin film grown on a dielectric substrate is a promising component for reconfigurable and tunable devices for numerous RF and microwave applications such as phase shifters, tunable filters, and tunable matching networks. The goal of this paper is characterization of the ins…
A new laboratory x-ray spectrometer for surface-sensitive extended x-ray absorption fine structure [(S)EXAFS] and surface-sensitive x-ray absorption near-edge structure [(S)XANES] measurements is described. The spectrometer employs a 12 kV mA rotating anode generator. It has a monochromator equipped with a set of exch…
A necessary microstructural condition for the manifestation of the effect of superplasticity in alloys is a small grain size (d < 10 μm). The ingots of commercial magnesium alloys have a very coarse cast structure with d > 100 μm. We have studied the regimes of heat treatment of such materials in AZ91, AE42, QE22, and…
Efficacy of poly(L-lactic acid) (PLLA)/nano-hydroxyapatite(HA) hybrid nanofibrous scaffolds for dental tissue engineering is described and their performance on normal cells with MG-63 is compared as well in this study. Perfectly PLLA/HA fibrous scaffolds were fabricated by an electrospinning process under optimal cond…
The polycrystalline Eu 2+ and Dy 3+ codoped strontium aluminates SrAl 2 O 4 : Eu 2+ ,Dy 3+ were prepared by a solid-state reaction. The UV-excited photoluminescence, persistent luminescence, and thermoluminescence of the SrAl 2 O 4 : Eu 2+ ,Dy 3+ phosphors with different compositions and ion doping was studied and com…
Fluid interfaces supported in microgravity by a helical structure are shown to have a more robust stability than more common structures such as liquid bridges. In particular, helical interfaces can take the form of infinite right circular cylinders over a broad range of configurations. In the case of a single fixed co…
The reaction kinetics of the selective oxidation of carbon monoxide in the presence of hydrogen on a Pt/carbon support catalyst was studied. It was found that this catalyst exhibited high activity and decreased the concentration of CO in a hydrogen-containing gas from 0.6–1.0 vol % to less than 10 ppm at the inlet con…
This paper deals with AC particle-triggered corona discharge as a follow-up to our previous research with DC voltage to clarify the particle-triggered corona discharge process in SF6gas. Corona current pulses, charges associated with a corona current pulse, and corona light pulses were observed with an aluminum ellips…
Abstract Polymer photoelectronic device based on interaction between π‐conjugated polymer matrices and photochromic molecules was fabricated. The theoretical and experimental studies proved that the photochromic reaction in studied devices should eventuate in changes of optical and electrical properties of polymers su…
The conoscopic images of twisted nematic liquid crystal devices filled with E7 are analysed under the application of in‐plane electric fields. The differences observed between the images for positive and negative applied fields are attributed to the flexoelectric effect. By comparison of the conoscopic images with the…
The kinetics of formation of nanostructured glass-ceramic materials based on silicate glass doped with lead sulfide PbS is investigated using small-angle X-ray scattering and X-ray powder diffraction. The influence of two-stage heat treatment on the properties of the material is studied. It is established that, in the…