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。
An attenuated total reflectance (ATR) permeation cell has been used to evaluate the permeation of polymer samples from chemical protective clothing (CPC), mainly gloves, by several chemical types including a solvent, a commercial pesticide mix, and a volatile solid. Good contact between sample and ATR crystal was ensu…
Abstract The rate of the morphology development of immiscible polymer blends is closely related to the rates of melting of the polymer constituents. A two‐zone model was developed to describe the rate of melting of the polymer pellets of mixtures of two semicrystalline polymers in an internal batch mixer. The mixing c…
Two different silicon nitride powders, one produced by self‐propagating high‐temperature synthesis (SHS) and one commercial, have been equally processed to obtain dense materials. Y 2 O 3 powders as a sintering aid and hot‐pressing techniques were used to process the materials. The fracture toughness and strength of t…
ZrO{sub 2}-SiO{sub 2} sol-gel powders were produced using tetraethoxysilane (TEOS) and zirconium propoxide. After gellation, the ZrO{sub 2} crystallization process was investigated using X-ray diffraction (XRD), thermal analysis (DTA/TGA), and scanning electron microscopy (SEM). Fresh gels were amorphous. Thermal trea…
Abstract Molecular dynamics (MD) simulations have been performed for several pure alkali nitrate melts. Special attention was paid to the examination of the interaction potential: macroscopic quantities like pressure were calculated and compared with real values. To improve the results the commonly used potential for…
The stitch formation process of a lockstitch sewing machine has been investigated with the aid of transducers which facilitate real-time monitoring of the sewing cycle. It has been found that increasing the travel of the check-spring by three millimetres from the normal position significantly reduces needle thread con…
The paper reports on an ESR study of Cr-and Ca-codoped SrTiO 3 films, 1700 and 350 nm thick, before and after UV irradiation (λ=365 nm). The spectrum of the thick film (1700 nm) exhibits two ESR lines with g factors of 1.977 and 1.974, which belong to the Cr 3+ centers. In the spectrum of the thin film (350 nm), one o…
This study examined the influences of stitch density on the strength, extensibility, and stress withstand retention of three stitch types commonly used for knitted fabrics. With experimental and theoretical analyses the patterns of changes in various stitch structures brought about by the increase of stitch density we…
Derivative thermograms (DTG) for the desorption of dimethylformamide (DMF) from M n + −SWy−2/DMF complexes can be used to distinguish between different exchange cations simply by the temperature at which the most strongly held DMF molecules are desorbed. The maxima for the desorption of this strongly bound DMF in the…
Ranges of validity for the continuum-beam model, the length-scale effects and continuum assumptions are analyzed in the framework of scaling analysis of NT structure. Two coupled criteria for the applicability of the continuum model are presented. Scaling analysis of NT buckling and geometric parameters (e.g., diamete…
Four silicas, two fumed silicas (one hydrophilic and one hydrophobic) and two precipitated silicas (one hydrophilic and one hydrophobic), were added as filler to solvent-based polyurethane (PU) adhesive formulations. In general, the addition of silica increased the viscosity, the storage and loss moduli of the PU adhe…
Plywood and oriented strand board (OSB) are being used increasingly in the construction of upholstered furniture frames. Yet there is little information available concerning the holding strength of various fasteners, and, in particular, dowels in these materials. A study was conducted accordingly, to obtain basic info…
Polarization ordering in Pb1−xLax(Zr0.65Ti0.35)0.98O3 ceramics for x=8%, 9% and 9.5% (PLZT x/65/35) was detected from the temperature dependence of the averaged second harmonic generation (SHG) intensity. In PLZT 8/65/35 it shows two drops near the freezing transition (at about 50 °C) and slightly below the Burns temp…
Aluminum-lithium alloy 1420, which, after equal-channel angular pressing, has a grain size of about 3 µm, is shown to possess superplasticity in a temperature range of T=320–395°C upon tension at a constant relative strain rate of 10−2–10−3 s−1. The axial deformation at fracture can exceed 1800%. The data processing a…
The initial growth of GaAs films on a Si/porous Si/Si (SPS) substrate has been investigated using reflection high-energy electron diffraction. The morphology and the thickness have been examined by a Nomarski optical microscope and scanning electron microscope, respectively. The results of the low temperature photolum…
In the reaction‐bonded aluminum oxide (RBAO) process, attrition‐milled Al/Al 2 O 3 powder compacts are reacted in air to form Al 2 O 3 ‐based ceramics. Typically, ZrO 2 powder is added to control the final microstructure and properties, resulting in fine‐grained, high‐strength materials. In this study, the effects of…
Abstract Gallium(I) tetrachlorogallate(III) Ga[GaCU] was prepared in quantitative yield by thermal decomposition of dichlorogallane [HGaCl 2 ] 2 , which is readily available from Et 3 SiH and [GaCl 3 ] 2 . The reaction of catechol with solutions of this gallium(I) tetrachlorogallate(III) in tetrahydrofuran leads to t…
We report Raman scattering studies of the graphitization process in a series of carbons produced by the pyrolysis of saccharose and anthracene and then annealed at 1000, 1900 and 2300°C. Using 488 nm light, the first- and second-order Raman spectra of six samples have been examined in the range 50-4000cm−1. The low-fr…
The atomic structure of the Zn6Mg3Ho icosahedral quasicrystal has been studied by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) with Z-contrast (Z: atomic number). We demonstrate that in particular Z-contrast imaging is quite powerful for specifying heavy atom positions in the qu…
Properties of sputtered polycrystalline Ni ferrite (NiO: Fe 2 O 3 ) films were studied in detail. All these films were sputtered on Al 2 O 3 polycrystalline substrates. The coercivity of the films drastically increased from 5 to 800 Oe as the deposition temperature was raised from 60 to 600°C. Polycrystalline ferrite…