Materials Literature
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A system for the automated detection and location of partial discharge (PD) in substations is proposed. The system comprises a network of self-calibrating radiometers and an algorithm that locates the PD source by using information in the spatial distribution of the sources radiated power. Two particular algorithms ar…
The influence of sintering temperatures on solution-processed cadmium telluride (CdTe) nanocrystal films is studied in order to maximize the performance of CdTe/Al Schottky nanocrystal solar cells. The best overall performance of 2.67% efficiency at air mass 1.5 was achieved from devices with CdTe films sintered at 35…
Ni-YSZ (YSZ - yttria-stabilized zirconia) films were fabricated by the reactive magnetron co-sputtering of Ni and Zr-Y targets. The maximum deposition rate was 6 μm·h-1. The oxygen flow and the DC power supplied to the Ni target were tuned to study the effect of the deposition conditions on the film properties and to…
Monitoring the contents of decomposed components of SF6in order to identify the internal insulation faults of electrical equipment with SF6dielectric is a common practice. Partial discharges (PDs) can lead to the decomposition of the SF6dielectric. The new reactions also cause the final decomposed components to differ…
A facile and efficient strategy for the synthesis of graphene-ZnS nanosheets composite (G-ZnS) is demonstrated for the first time. Firstly, functional graphite oxide (GO) was fabricated by the layer-by-layer (LBL) self-assembly of poly (diallyl dimethyl ammonium) chloride (PDDA) and poly (styrene sulfonic acid) sodium…
I compositi a base di schiuma d’alluminio sono materiali molto interessanti per l’applicazione nel settore dei trasporti. In particolare, i sandwich realizzati tramite legame metallurgico con due pelli in alluminio e il core in schiuma d’alluminio (AFS), si candidano all’impiego in componenti strutturali grazie alla l…
Graphene is a 2D - one-atom thick - carbon-based crystal, fabricated for the first time in 2004 through graphite exfoliation [1]. Its unique properties [2], such as the ambipolar field effect and high mobility due to low phonon scattering, soon captured a significant amount of research interest, primarily towards the…
We present a low voltage driven polymer-stabilized blue phase liquid crystal (PS-BPLC) device by in-plane and fringe field inner cell. The combined electric field between the slit electrodes can penetrate deeply and induce higher birefringence in LC layer. Thus, high transmittance in our PS-BPLC device was obtained un…
Defects are central to any understanding of material characteristics. They determine a host of material properties, including strength, ductility, resistivity and opacity. Positron annihilation spectroscopy (PAS) is a well-established high-sensitivity technique for detecting defects in solids. In this work, we study t…
Aggregation of 4-[5-(4-hydroxyphenyl)-3-oxopenta-1,4-dienyl]benzoic acid (chromophore) and its potassium salt in optically neutral polymeric matrices was studied. The dependence of the third-order nonlinear optical properties of the chromophore-polymer composites on the aggregate size was determined.
Lu2O3:Pr,Hf ceramics were prepared by means of high temperature sintering and their thermoluminescent characteristics were investigated. After stimulation with X-rays or deep-UV photons strong thermoluminescence bands peaking at around 110°C, 220°C and 310°C were observed. The lowest temperature peak was found to fade…
Kurzfassung Die Kenntnis der Deformations- und Schädigungsmechanismen beim langsamen Risswachstum in Polyethylen (PE)-Rohrwerkstoffen ist im Hinblick auf ihre Lebensdauervorhersage von besonderer Bedeutung. Eine etablierte Möglichkeit der Simulation und Vorhersage des langsamen Risswachstums ist der Full-Notched Creep…
Herein, we report on the modification of silica nanoparticles with the molecule 7-amino-4-methylcoumarin (AMC) via a hydrophilic dextran linker using reductive amination chemistry. The AMC-functionalized nanoparticles were shown to aggregate in response to irradiation by 350 nm UV light. The aggregation of the particl…
The breakdown characteristics of any given insulation is determined by its voltage-time (v-t) characteristics. The superior characteristics of compressed air will mitigate the use of SF6 gas in Medium voltage circuit breakers and indoor design gas CB. In order to analyze the performance of compressed air experiments a…
We analyze the properties of electromagnetic metamaterials with anisotropic constitutive parameters. Particularly, we analyze the so-called Radial Photonic Crystals, which are radially periodic structures verifying the Bloch theorem. This type of crystals can be designed and implemented in acoustics as well as in elec…
Introduction During the process photodynamic therapy (PDT), bleaching of photosensitizer induced by irradiation and generation of reactive oxygen species (ROS) can provide some information concerning the efficiency of treatment. Since gold nanoparticles (GNPs) have been highlighted as efficient drug delivery systems,…
Ageing behaviors and microstructural characterization by aging condition of Ti-Al-Mo-Fe alloy was investigated. Due to the formation of ω phase, it occurs a drastic change in mechanical properties of β alloys. There is large increasing in hardness and yield strength, accompanied with serious ductility reduction. Howev…
Micro solid oxide fuel cells (μ-SOFCs) based on MEMS fabrication processes have become an increasingly attractive development for portable power generation applications, due to their high power density and their compatibility with hydrocarbon fuels. For system packaging, the silicon-based fuel cell membrane module nee…
The aluminized 8407 steel was room temperature hard anodized for 60 min at sulfosalicylic acid concentration of 50 g/L, and current density of 2.5 A/dm2. Cross section microstructure of the oxide film and the combination status between the film and the substrate were observed with metallographic microscope. Surface mo…
This paper presents an approach for calibration of ultra-high-frequency (UHF) partial discharge (PD) signals in high voltage direct current (HVDC) transformer. A linear relationship between the amplitude of the UHF PD signal and PD apparent charge was obtained through the theoretical analysis. The finite-difference ti…