Materials Literature
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The low-cycle fatigue behaviour of copper and a-brass CuZn30 was investigated in uniaxial and biaxial tests. Planar biaxial fatigue tests were carried out using cruciform samples with proportional stain paths with and without phase shift between the two axes. Microcharacterisation was performed by electron microscopy…
Phase-change memory (PCM), although promising operative at room temperature, is struggling to achieve ten-year data retention over 100°C. We disclose here that a PCM device made of the composition Ga25Te8Sb67exhibits normal operation at 100°C for an endurance of at least 3 × 105cycles. At room temperature, the enduran…
Extended abstract of a paper presented at Microscopy and Microanalysis 2010 in Portland, Oregon, USA, August 1 – August 5, 2010.
The microstructure-mechanical properties relationship in ultrafine-grained Ti-Fe-Sn alloys with high strength and large plasticity was investigated. The alloys are mainly composed of a hypereutectic microstructure with micrometer-sized primary dendrites embedded in an ultrafine-grained eutectic matrix. The bimodal com…
Urea-based bis-silylated 2,2′–Bipyridine (bpy) organic–inorganic hybrids incorporating different lanthanide (Ln3+) ions (Eu3+, Gd3+, Tb3+ or Eu3+/Tb3+) were obtained by the sol–gel process. The structure and the emission characteristics of the hybrids were ascertained using X-ray diffraction, nuclear magnetic resonanc…
In pure Ti, the influence of shear deformation on the α to ω transformation and the development of texture in the ω-phase under high-pressure torsion (HPT) straining were investigated by means of X-ray and neutron diffractions. The fraction of ω-phase increased with strain in the ω-phase state. Bulk submicrocrystallin…
The atomic and magnetic structures of La0.5Ca0.5CoO3 cobaltite have been studied by the neutron diffraction technique at high pressures of up to 4 GPa in the 10- to 300-K temperature range. The pressure dependences of the structural parameters have been obtained. The Curie temperature increases with the pressure with…
It has been reported that the hydroxyl (OH) radical is produced by irradiating ultrasound to titanium dioxide (TiO2). On the other hand, infection at the exit site of catheter retained in the body has become a serious problem. Therefore, we are developing a novel anti-infective catheter system in which the exit site o…
The arc-discharge process is usually used to synthesize some kinds of metal nanocrystals or nanoparticles all with high melting temperature. Here, the carbon-coated Sn (with a low melting temperature) nanostructured materials with different shapes, such as carbon-coated Sn nanorods with diameter of about 100 and 50 nm…
This paper focuses on the optimal design of surface permanent magnet synchronous motors. A comparison between Hooke Jeeves method and genetic algorithm is presented. The mathematical model of motor is an analytical model based on the equivalent magnetic circuit considering magnetic saturation. The objective function i…
The present work focuses on the transformation of high-purity Ni powder blends of controlled volume fractions (40 and 60 %) of nanometre-sized (100 nm) and micrometre-sized (544 nm) particles into bulk samples as part of a strategy for producing ultrafine-grained materials usefully exhibiting both strength and ductili…
This paper mainly studies computer automatic measurement of cashmere diameter, and the method of cashmere fiber. Simulation experiment is carried out under the simulation environment of Matlab7.0 and the processing scheme which is suitable for the fiber images is confirmed, and finally, on the basis of the images afte…
We investigate the dynamics of charged states (polarons) in bulk heterostructures of polythiophene and fullerene derivatives by means of photoinduced absorption spectroscopy, and is compared them with those in pristine polythiophene thin films. Polaron lifetimes in the bulk heterostructure and in polythiophene thin fi…
It has been recognised previously that limiting the maximum energy of secondary electrons used for image formation in a scanning electron microscope (SEM) generates contrast not present in standard SEM images. Here we give examples how energy filtered SEM improve the usefulness of SEM in the characterisation of semico…
Extended abstract of a paper presented at Microscopy and Microanalysis 2010 in Portland, Oregon, USA, August 1 – August 5, 2010.
The dispersion relation for localized plastic deformation autowaves emerging at the easy glide and strain-hardening stages in metals and alloys is established experimentally and analyzed. The quadratic form of this relation and the form of the wavenumber dependence of the phase and group velocities of autowaves are ex…
A simple mechanism based model for fatigue crack growth assumes a linear correlation between the cyclic crack-tip opening displacement ( ΔCTOD ) and the crack growth increment ( da/dN ). The objective of this work is to compare analytical estimates of ΔCTOD with results of numerical calculations under large scale yiel…
Abstract A conjugate polymer poly[p‐(phenyleneethylene)‐alt‐(phenyleneazophenyleneethylene)] (PPEPAPE) containing azobenzene building block in the polymer backbone was synthesized via Sonogashira cross‐coupling of 4,4′‐diiodoazobenzene and 1,4‐diethynyl‐2,5‐didodecyloxybenzene. All the monomers and the resulting polym…
Recent work has identified that circumstances of equipment operation can radically change condition monitoring data. This contribution investigates the significance of considering circumstance monitoring on the diagnostic interpretation of such condition monitoring data. Electrical treeing partial discharge data have…
Proton and deuteron conductivities in the BaZr1 − x Y x O3 − δ system (x = 0.02–0.2) are investigated experimentally over the temperature range 600–900°C in reducing H2/H2O and D2/D2O atmospheres with pH2O = pD2O = 3.15 kPa.