Materials Literature
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In this paper, a three-dimensional, fully-isotropic, broadband negative-refractive-index medium is proposed. The structure has a negative-index bandwidth of 24% and a simulated loss of 0.063dB/cell at the operating frequency of 1.5GHz (where n ≈ -1). The fabrication process for this metamaterial, which utilizes stereo…
Insulation materials deteriorate with time due to numerous operational and environmental influences. Owing to thermal and electrical ageing, moistening, etc., several chemical and physical deterioration processes in the insulation materials arise, which result in the decrease of the electrical strength and influence d…
With the continued miniaturisation of semiconductor devices, there is an increasing need for nanoscale characterisation. Dopant mapping in a Low Voltage Scanning Electron Microscope (LV-SEM) was identified as a potential technique to fulfil this need, provided that a small enough probe size (~0.1 nm) could be achieved…
The Environmental Scanning Electron Microscope (ESEM) differs from a conventional SEM in that a differential pumping system maintains a pressure of gas (typically H 2 O) in thespecimen chamber whilst the gun remains at high vacuum. Ionizing collisions between electrons and these gas molecules create positive ions whic…
The Scanning Electron Microscope (SEM) is the most widely used high performance microscope in all fields of science but it is now reaching the theoretical limits of its performance. While advances in sources, optics, and detectors, can result in some improvement in performance the ultimate resolution is limited by fun…
Temperature dependence of magnetic anisotropy of homologous nematic fluorinated phenyl bicyclohexane liquid crystals is measured by a magneto-electric method. The result shows that the diamagnetic property is slightly influenced by the positions and the numbers of fluorine atoms substituted at the phenyl ring. By inve…
A large amount of parameters related to both operating conditions and material design affects the electrical ageing of the low voltage rotating machine insulation. Accelerated ageing tests are usually undertaken in order to develop a theory to describe the electrical ageing process and to determine a lifetime model of…
The low density of magnesium alloys makes them attractive for lightweight constructions. However, creep remains an important limitation of Mg alloys. To gain a more detailed understanding of the correlation between microstructure and creep properties in Mg alloys, creep tests have been performed on MRI 230D samples fe…
State-of-the-art focused ion beam (FIB) instruments have an ion column for sample modification and an electron column for scanning electron microscopy (SEM). 3D reconstruction of a sample volume can be achieved by serial sectioning using the FIB in combination with high-resolution SEM imaging of each cross-section. Us…
Specimens of 2507 super-duplex stainless steel aging at 850°C for 5 min, 15 min and 60 min were investigated to evaluate the pitting corrosion resistance in 3.5% NaCl solution at 30°C and 50°C. The results are correlated with the microstructures obtained with different aging time. The precipitation of σ phase remarkab…
Mg of purity 99.8 wt% was deformed by High Pressure-Torsion at hydrostatic pressures 1 to 4 GPa and RT, up to plastic shear strains of 120. X-ray texture analysis showed up deviations from expected shear texture, which increased with increasing shear strain and hydrostatic pressure. According to TEM and SEM investigat…
Information about truck movements on our transportation system is important for understanding and supporting freight mobility. Unfortunately, there is relatively little information available on how different land uses generate truck trips. Such information is necessary as input into travel forecasting models as well a…
This paper proposes a ferrite left handed coplanar waveguide (LH CPW) phase shifter that makes no use of any active element. The ferrite substrate was designed to be biased by an external DC magnetic causing the ferrite substrate to be magnetized in the same direction as the applied DC magnetic bias. A horizontal DC m…
Statistics of acoustic emission accompanying plastic deformation and of stress serrations caused by the Portevin-Le Chatelier effect are studied during tension of an Al3%Mg alloy at room temperature. Power-law distributions of acoustic emission reflecting self-organization of dislocations and intermittency of plastic…
Extended abstract of a paper presented at Microscopy and Microanalysis 2010 in Portland, Oregon, USA, August 1 – August 5, 2010.
Basic regularities of the anodic dissolution and cathodic behavior of iron family silicides in acidic and alkaline electrolytes are considered. The effect of external and internal factors on the mechanism and kinetics of the anodic process is studied using a combination of electrochemical, analytical, and structural m…
Direct brazing is a well-known technique for joining ceramics either themselves or to metals, whereby the required costly active filler alloys are considered a handicap of this process. In this work the indirect brazing of zirconia to zirconia mechanically metallized with Ti was successfully achieved using conventiona…
The display of digitized PD pulses with respect to the power frequency AC cycle has been widely applied both in the laboratory measurement of PD, as well as within industrial PD measurement systems on equipment such as cables, transformers and rotating machines. Theory shows that PD will occur with a specific polarity…
Transparent polyethylene terephthalate (PET) substrates were coated with SiO 2 and ZrO 2 using thermionic vacuum arc (TVA) method for the first time. The melting point of PET is approximately 260°C. Transmittances, thickness, reflectance, and refractive indices of coated PET samples were measured by ultraviolet—visibl…
Extended abstract of a paper presented at Microscopy and Microanalysis 2010 in Portland, Oregon, USA, August 1 – August 5, 2010.