Materials Literature
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Brittleness is the main technical limitation on a wide use of advanced ceramic materials. To overcome this problem, ceramic-metal composites are commonly applied. A principal advantage of ceramic-metal composite materials is their higher resistance to brittle fracture. An increase of fracture toughness depends on the…
Over the last few decades decatungstate-mediated reactions have been explored extensively and have found widespread applications in catalysis. In particular, decatungstate has been successfully used as an efficient catalyst in many oxidative chemical transformations, via free radical pathways, and to a lesser extent u…
We present a theoretical investigation of the evaporation of a liquid on a solid substrate into the atmosphere of its pure vapor. The evaporation is provoked by the overheating of the substrate above the saturation temperature. At partial wetting, the liquid forms a wedge ending at the triple liquid-vapor-solid contac…
A previous study has shown that the current low frequency harmonics, even with low amplitudes, have a strong influence on the global vibrations of a wound rotor synchronous machine. Therefore an harmonic dedicated regulation of the machine currents, allowing to manage in a low cost way their harmonic content, can dras…
The structures of the heptazine-based graphitic C 3 N 4 and the S-doped graphitic C 3 N 4 are investigated by using the density functional theory with a semi-empirical dispersion correction for the weak long-range interaction between layers. The corrugated structure is found to be energetically favorable for both the…
A compliant 2-DOF nanopositioning stage with a novel concept of dual-mode driven is proposed in this paper aiming to improve the scanning performance of the Atomic Force Microscope (AFM). The stage is featured with nanoscale positioning precision, high bandwidth, long scanning range and fully decoupled structure, whic…
This paper describes three implementation alternatives of a multiplicative general parameter finite impulse response filter (MGP-FIR) used as a precise current reference generator for shunt-type active power filters. Compared to the traditional techniques that use fixed digital or analogue filters, the MGP-FIR is an a…
Cu-poor Cu 2(1- x ) ZnSnSe 4 powders were prepared from elemental powders. The crystal structure of Cu-poor Cu 2(1- x ) ZnSnSe 4 was examined by X-ray diffraction (XRD) and X-ray absorption fine structure (XAFS) analyses. Kesterite-type Cu 2(1- x ) ZnSnSe 4 could be prepared in the range of 0≤ x ≤0.0750. The lattice p…
The impact of defects on the performance of p- and n-side illuminated microcrystalline silicon solar cells is investigated. The absorber layer spin density NS is controlled over some two orders of magnitude by electron bombardment and subsequent annealing steps. At increased NS (between 3 × 1016 and 1018 cm−3), perfor…
The NTN-SNR FB2 test rig was developed 40 years ago with the objective to assess the rolling contact fatigue (RCF) life of steels. The aim was to get a relatively quick and cheap evaluation of the performance of steels and processes, on simple rings, under well controlled operating conditions, compared to full scale t…
A Tm3+ doped nanoparticulate silicon thin film and subsequent surface waveguides fully fabricated by using femtosecond (fs) pulsed laser are reported. The thin film exhibits strong room temperature fluorescence peaked at 2.04 μm when using an 808 nm diode laser. The fs-pulsed laser deposited film was then processed us…
Abstract The photocatalytic properties of titanium dioxide depend not only on its electronic properties, but also on the material size and shape, which can increase interactions between the reactants and catalyst. Most studies to date show that reducing the particle size down to the nanoscale increases photocatalytic…
This paper presents the growth conditions of In0.27Ga0.73N/Si(111) thin film with thickness of 110 nm prepared using plasma-assisted molecular beam epitaxy technique. Indium mole fraction of 0.27 was calculated using X-ray diffraction and Vegard’s law. Some ridges on the film were observed on the as- grown surface mor…
Despite these recent advancements in preparing the surface of Cd(Zn)Te devices for detector applications, large asymmetries in the electronic properties of planar Cd(Zn)Te detectors are common. Furthermore, for the development of patterned electrode geometries, selection of each electrode surface is crucial for minimi…
A practical concern with implementing the fixed band hysteresis current control in active power filters (APF) is its variable switching pattern that results in increasing the risk of occurrence of resonance in power systems. To avoid this situation, adaptive hysteresis current control methods with the variable hystere…
In producing the Si heterojunction interdigitated backcontact solar cells, we investigated the feasibility of applying amorphous Si emitter having considerable crystalline Si phase at the facing to transparent conducting oxide (TCO) layer. Prior to evaluating electrical property, we characterized material nature of hy…
BaTiO3/hyperbranched polyester/methacrylate core-shell nanoparticles were studied by varying the shell thickness and the methacrylate ratio. We demonstrated that coalescence typically observed in traditional composites employing polymer matrices is significantly reduced. By modifying the shell thickness, the equivalen…
Diagnosis of electrical equipment, particularly distribution and power transformers, which are considered as the heart of the electric power grid, has been quite important for quite a long time. Transformer diagnosis methods have been introduced and employed to recognize transformer internal defects since many years a…
The vast and rugged protein energy surface can be effectively represented in terms of local minima. The basin-hopping framework, where a structural perturbation is followed by an energy minimization, is particularly suited to obtaining this coarse-grained representation. Basin hopping is effective for small systems bo…
In northeastern North America, Zygiella atrica often build their orb webs near the ocean. We analyzed individual field-built Z. atrica webs to determine if organic low-molecular-mass solutes (LMM) in their sticky droplets showed any unusual features not previously seen in orb webs of other species living in less salty…