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 This paper is in four parts. The first is related to general considerations and experimental analyses, and each of the successive papers is related to different approaches to theoretical analyses of the mechanical behaviour of weft-knitted fabrics and weft-knitted reinforced composites made of glass fibre. Th…
Wood-plastic composites have emerged primarily in response to the need for moisture-durable wood-based materials. Although a great deal of research has addressed extruded composites and formulations, little work has addressed the use of thermoplastics to modify conventional particulate wood composites. This research i…
The flow behaviour and ductility of the Al-alloy AA7075, Mg-alloy AZ80 and Ti-alloy Ti-6Al-4V were investigated in quasi-static and dynamic compression tests at strain rates in the range 0.001 s -1 ≤e ≤5000 s -1 and temperatures between 20°C and 450°C. For strain rates e≤100 s -1 , the compression tests were carried o…
Undoped and phosphorus-doped diamond thin films grown by Microwave Plasma-enhanced Chemical Vapour Deposition (MPCVD) on Ib {111}-oriented diamond substrates have been studied by confocal micro-Raman spectroscopy and confocal Raman imaging. A distinct Raman peak, broader and 6 cm−1 lower than the zone-centre optical p…
A complex investigation of the dynamics of electronic excitations in potassium dihydrophosphate (KDP) crystals is performed by low-temperature time-resolved vacuum ultraviolet optical luminescence spectroscopy with subnanosecond time resolution and with selective photoexcitation by synchrotron radiation. For KDP cryst…
Degradation of water resources due to anthropogenic activities is a major problem all over the world. Monitoring changes in water quality is expensive but essential for management of water resources. Diatom assemblages can serve as useful indicators of changes in water quality. In order to determine changes in stream…
Abstract A near infrared (NIR) spectroscopy approach was undertaken to collect information on the Al cationic distribution in tetrahedral and octahedral sites in natural chlorite (clinochlore) samples. Structural formulae were established using electron microprobe and Mössbauer spectroscopy. A band located near 7115 c…
The process of polymers weathering and the methods of polymers weathering and accelerated ageing investigations were characterized. Accelerated ageing tests of polyethylene and polypropylene samples have been done in laboratory conditions. The ageing time (up to 400 h) influence, at various levels of ageing factors: U…
The soft magnetic property of FeCo films with thin NiFe or NiFeCr seed layers (saturation flux density of 2.4 T) is discussed in relation to lattice strain of the FeCo films. The coercivity along hard axis of magnetization (H/sub c//sup HA/) reduces as the Ar pressure during sputtering deposition decreases, and moreov…
Taylor impact tests were performed on ductile and brittle materials metals and the results indicate that failure is initiated by the coalescence of lateral release waves behind the incident shock formed upon impact. The failure process in the ductile materials involves nucleation and growth of voids and in the brittle…
Abstract We present a foam flow model for flow pattern prediction in the polyurethane foaming process that considers the flow caused by foam expansion due to bubble generation. The flow pattern in the cavity is calculated by taking into account the initial volume shape and the rate of foam expansion of a poured reacti…
A continuum model is employed to study systematically the optical response of hybrid-aligned nematic (HAN) liquid crystal cells under the application of an external electric field. The influence of the flexoelectric effect is discussed for a large range of anchoring strengths at the homeotropic alignment layer. It is…
Polycrystalline BaFe/sub 12-x/Al/sub x/O/sub 19/ powders (0.0/spl les/x/spl les/4.0) were fabricated by a wet chemical process. Magnetic properties and crystalline structure were investigated by using an X-ray diffractometer, vibrating sample magnetometer, and Mossbauer spectroscopy. The result of X-ray diffraction pa…
The stability of the magnetic properties of Sm/sub 2/Co/sub 17/-type magnets at high operating temperatures was investigated by magnetic measurements at room temperature (RT) and high temperatures (HTs). The coercivity at RT is changed by the HT measurement and starts to decrease after measurements above 400/spl deg/C…
Microstructural attributes such as grain size d and dislocation density /spl zeta//sub d/ affect the hysteretic magnetic properties of steels because they affect domain wall movement and pinning. In an earlier paper, a model was proposed for computing hysteresis loops based on the effect of grain size and dislocation…
In the present study, dynamic compression tests have been performed on polycarbonate (PC) specimen for strain rates in the range of 500 to 2000s -1 and on aluminum for a strain rate around 1300s -1 using a Split Hopkinson Pressure Bar (SHPB). Temperature measurement has been carried out using a fast response infrared…
One-phonon visible-range Raman spectra of a-C: H〈Cu〉 and a-C: H〈Co〉 composite films with comparable metal and carbon contents were studied in the frequency region 1200–1700 cm−1 including the carbon sp 2-bond vibrations. Broad bands G and D characteristic of unmodified a-C: H films, as well as some additional features…
Cobalt Y-type hexaferrites are of interest as high permeability /spl mu/ materials in the miniaturization of integrated circuits. We oriented particles of sintered Co/sub 2/Y-type hexaferrite with c-axis normal to the slab plane. We measured the magnetic properties of Co substituted Y-type hexaferrites (Co/sub 0.25/Zn…
Abstract In our multi‐frequency EPR study of Cr 3+ doped PbTiO 3 nanopowder samples with varying mean particle size, three paramagnetic Cr 3+ centres (C1, C2, C3) with different axial fine structure (FS) parameters are identified, with one of them (C1) being compatible with former literature measurements on bulk and c…
Activated carbon with a high adsorption capacity for the removal of organic compounds from aqueous solutions was made from phosphoric acid-activated peanut shells. Adsorption isotherms for the uptake of phenol, iodine, Methylene Blue and tannic acid were obtained at 22°C. Freundlich, Langmuir and previously developed…