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 Transmission electron microscope-analytical electron microscope analyses have been carried out on secondary minerals from pillow basalts with various degrees of alteration from the Juan de Fuca Ridge (ODP Leg 168). The electron microscopic data indicate that the alteration products consist mainly of phyllosil…
Polarized extended X-ray absorption fine structure spectroscopy (P-EXAFS) was used to study the sorption mechanism of Ni on the aluminous hydrous silicate montmorillonite at high ionic strength (0.3 M NaClO4), pH 8 and a Ni concentration of 0.66 mM. Highly textured self-supporting clay films were obtained by slowly fi…
To investigate the substitution of Ti 4+ for Si 4+ on tetrahedral sites in clinopyroxene, a series of Ti- bearing clinopyroxene compositions was synthesized in the system CaO-MgO-SiO 2 -TiO 2 (CMST) at pressures from 1 atm to 2 GPa and temperatures from 800 to 1200 °C. Along the join CaMgSi 2 O 6 (diopside)-CaMgTiSiO…
A covalently linked ultrathin multilayer film was fabricated from 2-nitro-N-methyl-diphenylamine-4-diazonium-formaldehyde resin (NDR) and phenol-formaldehyde resin (PR) in methanol in-situ. The UV-vis, XRD, AFM and FTIR show that this multilayer is of high regularity, smoothness and stability.
We report atomic resolution imaging of Cu-planar precipitates in aged Al-Cu alloys, known as Guinier-Preston (GP) zones, by high-angle annular detector dark-field scanning transmission electron microscopy. Single layered GP-I zones as small as 2 nm in length were resolved among densely populated GP-I zones, whereas do…
The experimental data on the optical and chiro-optical properties of crystals with the sillenite structure Bi12 M xO20 ± δ (M= elements of II–VIII groups) have been reviewed. The relations between the changes in the chemical composition, the crystal structure of Bi12 M xO20 ± δ compounds, absorption, circular dichrois…
Excited state absorption (ESA) measurements of the Cr:Li 2 B 4 O 7 glass (Cr:LBO-glass) along with preliminary interpretation are presented. The presence of chromium in its tri- (d 3 ) and hexa- (d 0 ) valence states is observed. Both Cr 3+ and Cr 6+ ions appear to contribute in the de-excitation processes and can be…
We argue that, in static situations (magnetostatics, for instance) all materials can be considered as locally isotropic, though not homogeneous. Genuine anisotropy appears only in dynamic situations, e.g., in wave propagation problems.
X-ray absorption fine structure (XAFS) spectroscopy was applied to assess the solubility-limiting phase of Ni in cement and cement minerals. The study reveals the formation Ni and Al containing hydrotalcite-like layered double hydroxides (Ni-Al LDHs) when cement material (a complex mixture of CaO, SiO2, Al2O3, Fe2O3 a…
New Co-doped-SiO2-sol pillared montmorillonite has been synthesized by interlayer hydrolysis and condensation of tetraethylorthosilicate (TEOS) in the presence of Co2+ ion using an organic template. The Co K-edge XANES and EXAFS analyses for the CoO-SiO2-PILC (before and after calcination) and for the references such…
The current–voltage characteristics can vary significantly between individual microfabricated tips in as-fabricated arrays of cold cathodes. Such emission nonuniformity is undesirable in device applications. We have shown that in situ tip self-heating by the emitted electron current can be used to make the current–vol…
The application of analytical and numerical methods to an electromagnetic problem requiring an accurate representation of saturation is examined. The problem considered is that of tooth-ripple losses in salient-pole synchronous machines for the situation where the pole pitch is much greater than the armature slot pitc…
The effects of oxygen concentration on the electrical and optical properties of In 2 O 3 –ZnO films are investigated. In 2 O 3 –ZnO films deposited under the pure Ar gas show a resistivity of about 3.8 ×10 -4 Ω·cm, comparable to that of indium-tin-oxide (ITO) films (∼10 -4 Ω·cm), and an average transmittance of over 9…
Rutile-phase TiO2 thin films have been epitaxially grown on GaAs(100) substrates at 700 °C under 5 Pa oxygen ambient pressure, and at room temperature (30 °C) and 5×10−4 Pa base vacuum by KrF pulsed excimer laser deposition. The [110]-oriented TiO2 films were composed of two types of domains perpendicular to each othe…
Lipase-catalyzed ring-opening bulk polymerizations of 3(S)-sec-butylmorpholine-2,5-dione (BMD) were investigated. Selected commercial lipases were screened as catalysts for BMD polymerization at 110°C. Polymerizations catalyzed with 10 wt.-% of lipase PPL and PC result in BMD conversions of about 70% and in molecular…
The polybenzidine has been synthesized by thermal method and characterized by X-ray diffraction and infrared absorption studies. Further, polybenzidine has been doped with nitrate, sulfate and acetate ions. The electrical conductivity behavior of doped and undoped polybenzidine has been studied for various concentrati…
The reflectivity of extreme-ultraviolet thin-film multilayer (ML) interference coatings, terminated by a native oxide or other capping layer (CL), is critically dependent on the thickness of the final deposited layer of the top period. We show in this numerical study that, for a molybdenum-silicon ML, a high reflectiv…
In this study, electrical characterization of ceramic insulation coatings were evaluated by resistive, capacitance, and high voltage breakdown techniques. The insulation coatings were produced on Ag or AgMg sheathed Bi-2212 tapes and CuNb/sub 3/Sn wires by continuous, reel-to-reel sol-gel process. The coatings were th…
Abstract Environmental awareness has strongly stimulated the introduction of biodegradable materials based on renewable resources of natural origin. This paper describes the properties and manufacturing of such a bioplastic. In a counter‐rotating twin screw extruder, starch and polystyrene were mixed. To enhance mater…
A general transient simulation method accurately models the magnetic state of a device containing a ferromagnetic core by incorporating a scalar hysteresis model into the standard finite element framework. The method numerically implements the Jiles-Atherton hysteresis model to simulate hysteresis without introducing…