Recent advances in oxide-oxide composite technology
(1999). Recent advances in oxide-oxide composite technology. Advanced Composite Materials: Vol. 8, No. 1, pp. 17-23.
Materials Literature
文献浏览
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。
Studies of the interaction of copper with atomic and molecular oxygen
Oxidation of copper by atomic oxygen was found to differ significantly from oxidation by ordinary molecular oxygen. Firstly, a strong enhancement of oxidation was observed, particularly at the initial stages of oxidation (up to 106 times compared to molecular oxygen). The reaction probability of atomic oxygen is betwe…
Mechanisms of Surface Deterioration of High-Ni Grain Roll for Hot Strip Rolling.
Wear test was carried out by using the two disc type wear testing simulator to clarify the effects of the following factors on the surface deterioration in high alloyed grain cast irons. Namely, contact stress, microstructures, high temperature wear behavior and initiation and propagation of the surface microcrack whi…
Effect of the Orientation of Boron Nitride Grains on the Physical Properties of Hot‐Pressed Ceramics
Mixtures of two grades of boron nitride (BN) powder differing in their crystallinity were hot‐pressed in the presence of copper vapor. Two phenomena contributing to the bulk orientation have been recognized: the copper‐activated growth of microcrystalline BN grains, and the mechanical aligning of crystalline BN grains…
Oxygen Permeation Through Composite Oxide-Ion and Electronic Conductors
Oxygen permeation through composites consisting of four well‐known oxide‐ion conductors and a noble metal, or , is reported. The oxides were (YSZ) (BYC5), (SSC), and (LSGM). The results show that yields the highest oxygen permeation flux, but the composite deteriorates with time. The composites , , and give stable, bu…
Electron paramagnetic resonance and optical absorption spectra of Cr3+ions in fluorophosphate glasses
Electron paramagnetic resonance and optical absorption studies of Cr3+ ions in fluorophosphate glasses have been carried out at room and low temperatures. The EPR spectra exhibit two resonances at g≈4.67 and g≈2.0. These resonances are attributed to isolated Cr3+ ions and exchange coupled Cr3+ pairs respectively. The…
Impedance Characteristics of Oxide Layers on Aluminium
The electrochemical behavior of oxide layers on aluminium was studied using electrochemical impedance spectroscopy. Impedance spectra were taken at a compact and a porous oxide layer of Al. The anodic films on Al have a variable stoichiometry with gradual reduction of oxygen deficiency towards the oxide-electrolyte in…
Role of dissolution studies in controlled release drug delivery systems
La notion de dissolution a ete developpee par Noyes et Whitney en 1897, et les recherches dans ce domaine n'ont pas cesse de croitre. Ceci nous a donne non seulement une meilleure comprehension du procede, mais a egalement cree de nombreuses applications dans des domaines differents. Dans le cadre des systemes d'admin…
Adaptive Function of Gastropod Larval Shell Features
Similarities in features that occur commonly on the shells of many planktotrophic gastropod larvae may be interpreted primarily in terms of (a) shared ancestry, (b) shared adaptive solutions to problems of planktonic existence, or (c) shared artifacts of a basic pattern of early biomineralization. The Paradigm Method…
Complex formation between 3;3´‐diethylthiacarbocyanine iodide and DNA and its investigation in aqueous solution
The binding of 3;3′‐diethylthiacarbocyanine iodide (DTCC) with molecules of DNA was investigated by different photochemical methods. Absorption spectra were investigated under various concentration of DNA. Isosbestic points observed in these spectra are attributable to existence of two different complexes DTCC with DN…
New n = 2 members of the Li2Srn − 1MnO3n + 1 family, closely related to the Ruddlesden–Popper phases: structure and non-stoichiometry
New n = 2 members of the Li2Srn – 1MnO3n + 1 series closely related to the RP phases have been synthesized by solid state reaction for the first time: Li2SrNb2O7, Li2SrTa2O7, Li2EuTa2O7. The detailed structure determination of Li2SrNb2O7 performed by neutron diffraction and electron microscopy shows that it crystalliz…
A simple rule to find nondisjoint NBMO degenerate systems for designing high-spin organic molecules
For predicting organic ferromagnetic substances, we propose a simple rule to estimate the possibility as a high-spin molecule, based on molecular orbital coefficients by the simple Hückel's nonbonding molecular orbital (NBMO) method for organic conjugated systems. For the combination of several molecules in which each…
Electrosynthesis and characterization of poly(3-methoxythiophene)–polybithiophene composite films prepared in micellar media on Pt and Fe substrates
The electropolymerization of 3-methoxythiophene (MOT) was performed on Pt and Fe electrodes in an aqueous micellar medium containing sodium dodecyl sulfate and 10-3M bithiophene (BT). Electroactive, homogeneous, adhesive PMOT–PBT composite films are constituted of oligomers, including PMOT and PBT, and traces of copol…
Die magnetischen Eigenschaften der Alkalimetall-Manganpnictide KMnP, RbMnP, CsMnP, RbMnAs, KMnSb, KMnBi, RbMnBi und CsMnBi - Neutronenbeugungsuntersuchungen und Suszeptibilitätsmessungen
An den Alkalimetall-Manganpnictiden KMnP, RbMnP, CsMnP, RbMnAs, KMnSb, KMnBi, RbMnBi und CsMnBi wurden Messungen der magnetischen Suszeptibilität sowie Neutronenbeugungsexperimente zur Bestimmung der Spinstrukturen und der magnetischen Momente des Mangans durchgeführt. Alle Verbindungen ordnen antiferromagnetisch. Für…
The Crystal Structure and the Fluorescent Properties of Curcumin
クルクミンの分子および結晶構造を室温でX線結晶構造解析によって研究した。結晶は単斜晶系, 空間群はZ=4でP2/nで, 結晶格子はα=12.688 (3) Å, b=7.2061 (5) Å, c=19.897 (5) Å, β=95.28° (1) であった。低温でなされたTΦnnesenらの求めた構造と炭素骨格において大きな違いはないが, 結晶構造においてO1-O4の距離が長く, この間での分子間水素結合は弱いと思われる。分子はエノール型の構造をとっているがTφnnesenらの求めた構造より水素の局在化がみられる。結晶クルクミンはその蛍光特性および極性物質 (特にアルカリ性物質) と相互作用し, 固体表面特性の評価が可能であっ…
Aging in EPDM used for outdoor insulation
The effect of accelerated weather aging on ethylene-propylene-diene monomer (EPDM) rubber used for outdoor insulation was studied by surface roughness measurement and X-ray photoelectron spectroscopy (XPS). The surface roughness of EFDM rubber changed with aging time. The surface oxygen and aluminum content were found…
Novel supported uranium oxide catalysts for NOx abatement
The catalytic reduction of NO has been studied over novel supported uranium oxide catalysts which exhibit comparable activity and selectivity to that of conventional supported Pt catalysts and for which in situ XRD identifies the active phase to be UOx (2 < x < 2.25).
Uniqueness and long-time behavior for the conserved phase-field system with memory
This paper is concerned with a conserved phase-field model with memory. Weinclude memory by replacing the standard Fourier heat law with a constitutive assumptionof Gurtin-Pipkin type, and the system is conservative in the sense that the initial mass ofthe order parameter as well as the energy are preserved during the…
EPR analysis of La1-xMxMnO3+y (M=Ce, Eu, Sr) perovskitic catalysts for methane oxidation
A series of catalysts has been analysed before and after their use for methane flameless oxidation with air. In most cases, a g2, linearly temperature-broadened, Lorentzian-shaped EPR line was observed at T>Tmin, where Tmin is the temperature corresponding to the narrowest EPR line, ranging between 244 and 392 K, depe…
Calculation of phonon dispersion curves by the direct method
We report on a direct method which allows, making use of the full crystal symmetry, to calculate the phonon dispersion curves from known Hellmann-Feynman forces found by any ab initio program. For non-ionic crystals the direct method reproduces exactly the dispersion curves, provided the range of interaction is confin…