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。
Structural and thermodynamic properties of crystal hexagonal calcium apatites, Ca10(PO4)6(X)2 (X = OH, F, Cl, Br), were investigated using an all-atom Born-Huggins-Mayer potential by a molecular dynamics technique. The accuracy of the model at room temperature and atmospheric pressure was checked against crystal struc…
A pixel calibration of an IRFPA camera was developed to detect very small temperature variations induced by quasi-static loading of materials. The thermographic data were then used to estimate heat sources accompanying the deformation of PMMA and PC polymers during cyclic tests. The calorimetric balance analysis led u…
Nanoparticle composite porous films having a dielectric constant of ε r =1.7–3.5 have been deposited using plasma chemical vapor deposition. Nanoparticles as nano-building blocks and radicals as adhesives are generated in plasmas, and nanoparticles are deposited together with radicals on substrates to form porous film…
Abstract Three azido‐bridged coordination polymers, namely [Mn(L 1 )(N 3 ) 2 ] n ( 1 ), [Mn(L 2 )(N 3 ) 2 ] n ( 2 ), and [Mn(L 3 )(N 3 ) 2 ] n ( 3 ) [L 1 = N ‐(2‐pyridylmethylene)methylamine, L 2 = N ‐(2‐pyridylmethylene)ethylamine, and L 3 = N ‐(2‐pyridylmethylene)octylamine], have been synthesized with Schiff‐base c…
We present a new design of a phase mask coronagraph implemented with subwavelength diffractive optical elements consisting of optimized surface-relief gratings. Phase mask coronagraphy is a recent technique that seeks to accommodate both high dynamic and high angular resolution imaging of faint sources around bright a…
Theoretical modeling of Watt-level average power Tm-doped fluoride glass fiber amplifiers operating at 1.87 /spl mu/m is presented. To characterize and optimize these devices a computer model has been developed taking into account the full spectral information of the laser transition as well as all important ionic lev…
The structures of Pb1−xCdxTiO3 (x=0.03 and 0.06) were investigated by the x-ray Rietveld method at room temperature. It is surprising to find that the spontaneous polarization displacements of Pb∕Cd and Ti atoms according to the oxygen polyhedron decrease, although the c∕a ratio increases with doping-cadmium content.…
The corrosion behaviour of three low index planes of an hcp magnesium (Mg) single crystal was investigated in 10−2M NaCl/10−4M dichromate solution. The Mg (0001) surface exhibited pitting corrosion susceptibility at the open circuit potential. However, the (1010), and (1120) surfaces were passive at open circuit and p…
A kinetically controlled trans bifunctionalized organoimido derivative of hexamolybdate, (n-Bu(4)N)(2){trans-[Mo(6)O(17)(NAr)(2)]} (Ar = 2,6-dimethylphenyl) 1, in which the two 2,6-dimethylphenylimido groups are bonded to hexamolybdate at the trans positions, has been successfully synthesized in ca. 60% yield under mi…
Montmorillonite (MMT) and organically modified montmorillonite (OMMT) were utilized to reinforce the thermoplastic acetylated starch (TPAS) composite prepared with glycerol as a plasticizer. After the addition of layered silicates, the restriction of the motion of the intercalated acetylated starch molecular chains by…
Abstract Thermal diffuse scattering (TDS) of X-rays from crystals contains information on phonons. This paper reviews the general theory of TDS and some recent experiments aimed at further developing TDS into a useful and efficient method for studying phonon dispersion relations.
The Cyclic Voltammetry investigation and optical properties of some of the commonly used conjugated polymers for the fabrication of organic LEDs, like poly [2-methoxy 5- (2'-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV), poly [2,3-bis (2-ethylhexyloxy)l,4-phenylenevinylene] (BEH-PPV) and poly[(9,9'-di(2'-ethylhexyl)…
The influence of precursors on the morphology of ZnO is studied. The diameter and the aspect ratio of the ZnO nanorods, as well as the aggregate state, vary when different precursors are used. ZnO nanorods, nanotubes, nanoneedles, as well as aggregates of flower- and quasi-sphere-like nanorods are obtained. Besides th…
The effect of salinity and growth temperature on the accumulation of intracellular organic solutes was examined in the hyperthermophilic archaeon Palaeococcus ferrophilus. The genus Palaeococcus represents a deep-branching lineage of the order Thermococcales, which diverged before Thermococcus and Pyrococcus. Palaeoco…
The magnetic and transport behaviors of manganites are critically related to the spatial distribution and correlation of doped holes. Using in situ scanning tunneling microscopy, we have imaged both occupied and unoccupied states simultaneously in a hole-doped (La(5/8-0.3)Pr0.3)Ca(3/8)MnO3 epitaxial thin film grown by…
Abstract The atomic pair distribution function (PDF) approach has been used to study the local structure of liquids, glasses and disordered crystalline materials. In this paper, we demonstrate the use of the PDF method to investigate systems containing a crystalline and an amorphous structural phase. We present two ex…
The current form of partial discharge (PD) in a void was divided into fast and slow components, with short and long fall times, respectively. Comparing these with the current shape of PD in a void between two metal surfaces, in which the slow component was not observed, it was suggested that the formation of fast comp…
Structural, thermal expansion, thermal conductivity, magnetic, and dielectric measurements on single-crystal $R{\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{Ga}}_{x}{\mathrm{O}}_{3}$ ($R=\mathrm{Ho}$ or Y) hexagonal compounds have revealed that the $c$ axis decreases with increasing temperature with a larger $\ensuremath{\…
The three quasi-binary phase systems BiOX-BiOY (X, Y = Cl, Br, I) have been investigated by X-ray powder methods. No quaternary phases were found in the three systems. BiOCl-BiOBr and BiOBr-BiOI form systems of unlimited mutual solubility. BiOCl-BiOI is a system of limited solubility at the iodine-rich side. In the Bi…
XPS measurements of poly(dimethyl siloxane) recorded with a SSX-100 spectrometer in standardized experimental conditions are presented: survey scan, high resolution core level spectra as well as the energy loss regions of carbon, oxygen, and silicon peaks are analyzed. This is part of a contract work aiming to record…