Materials Literature
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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…
A high-quality BaTiO 3 thin film on SrTiO 3 substrate was obtained by shutting off the oxygen supply during growth. Epitaxial growth of BaTiO 3 film was carried out with molecular-beam epitaxy (MBE) under extremely low oxygen partial pressure ( p O 2 <1×10 -8 Pa). Although only Ba and Ti metals were supplied withou…
The phase boundaries of the solid phases of the Ni-Ta system at 1473 K, 1373 K and 1173 K were determined using the diffusion couple and EPMA techniques. The Ni-Ta binary system was then assessed by means of the CALPHAD method. Considering the crystallographic and the phase stability information, a new model. (Ni. Ta)…
We present simulations of the transmission and reflection of narrow-extent pulses incident upon a chiral sculptured thin film (STF) along its axis of spirality, when the circular Bragg phenomenon is excited. Even though the frequency-domain reflection and transmission spectrums of a sufficiently thick chiral STF slab…
A new method is described in which raw materials prepared by mixing kaolin and concentrated acid are heated in a furnace at temperatures between 100 and 700°C. Experiments with HCl, HNO3, H3PO4, and H2SO4 showed that only H2SO4 gave high reaction yields, which grew steadily as reaction temperature was raised. Reaction…
We have investigated the exchange of deuterium (or protium) implanted into an oxide ceramic, SrCe 0.95 Yb 0.05 O 3-δ , for protium (or deuterium) due to exposure to H 2 O (or D 2 O) vapor at room temperature by means of the elastic recoil detection (ERD) technique. It is found that D is completely exchanged for H by e…
The DC operation of surface-channel metal-semiconductor field-effect transistors (MESFETs) using p-type conductive layers on hydrogen-terminated diamond surfaces is investigated by two-dimensional device simulation. As a result, a model to describe the surface semiconducting layer, in which acceptors are distributed t…
The field‐activated sintering technique (FAST) was applied to simultaneously sinter and react sol–gel amorphous powders to form Al 2 TiO 5 . Densities close to theoretical and conversion to Al 2 TiO 5 (to 92.5%) have been achieved using FAST at 1050°–1200°C for 10 min. Conventional sintering of the same powders at 130…