Materials Literature
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Nanodielectrics have attracted the attention of many scientists and industrials as they may present superior dielectric properties compared to conventional dielectric composites. However, the success of these materials relies on a proper dispersion of the nanofiller within the matrix. In this work, the efficacy of hex…
This paper presents the results of thermal ageing of paper oil insulation at 140° C when DBDS and mercaptan sulphur are present in oil. It discusses the effects of simultaneous presence of DBDS and mercaptan sulphur at higher temperatures. It is observed that DBDS and Mercaptan sulphur increase copper corrosion. Diele…
The design, synthesis and characterization of magnetic-luminescent nanoparticles is now more and more studied since the last decade. However, optimizing the design of such materials requires a deep understanding of their physico-chemical properties. In this paper are reported extended investigations on luminescent and…
The endurance of components made of aluminum and aluminum alloys is often limited by their low yield strength and by their low wear resistance. The aim of this paper is to investigate the effect of different methods that can improve wear resistance of aluminum alloys. As a first approach, a highly wear resistant chrom…
Partial Discharge (PD) tests were performed in a metal-dielectric air gap between a spherical electrode and the surface of machine insulation, which consists of mica, epoxy resin and glass-fiber. The PD activities were investigated at three types of applied voltages: triangular, square and trapezoidal waveform. In the…
We present the design and implementation of a closed-loop control scheme for revolute joints actuated by SMA spring actuators in an antagonistic configuration. The proposed scheme employs a feedforward term, obtained as the inverse of the modified Prandtl-Ishlinskii (MPI) model of the system's response, in conjunction…
The adsorption of fibrinogen can be used as a quick indicator of surface haemocompatibility because of its prominent role in coagulation and platelet adhesion. In this work the molecular interaction between fibrinogen and a modified titanium oxide surface/platelet has been studied by quartz crystal microbalance with d…
Abstract A compact light guide plate (LGP) with special designed microstructures and dual collimated light sources was proposed to achieve an adjustable riming angle backlight for eco‐display. The micro‐prisms were utilized to guide the emitting rays toward normal viewing cones while a set of strip patterned diffuser…
The aging mechanism of an induction motor is observed using vibration signatures in this study. A wavelet based trending application is used through Multi Resolution Wavelet Analysis. The progress of aging is shown and interpreted based on the trends of different cases of the same induction motor. Aging region concept…
To assess the deterioration condition of stator insulation, diagnostic and AC dielectric strength tests were performed on five high voltage (HV) motors (2,000 HP, 6.6 kV) for boiler feed-water pump (BFP). Two HV motors for BFP were installed per unit. Following the long term rewinding program, the diagnostic test was…
Aluminum (Al) and Copper (Cu) have been used in graded density impactors. Al-Cu composites with different compositions have been prepared by hot pressing sintering. Intermetallic compounds were produced when the temperature was above 723 K, while they can’t be found at the temperature of 723 K. The relative density of…
Abstract We report the crucial role of solvent reservoir in drying under solvent atmosphere method on the growth of self-assembled micro- and nanowires from the solution of organic semiconducting N,N′-diperfluorophenyl-3,4,9,10-perylenetetracarboxylic diimide.
Silicon nanowires/nanoribbons (SiNW/SiNR) offer a highly sensitive and label free detection principle for biochemical applications, such as DNA and protein detection. The technique has potential both for low concentration detection as well as in scaling down the size of complete analysis systems required for rapid on-…
Nanosize Mg2+, Zn2+, Sr2+, and Na+ mono- and di-substituted calcium hydroxyapatites were synthesized using an aqueous precipitation route under controlled conditions. The chemical composition and the micro-structural features of the polycrystalline samples were characterized by chemical analysis, thermal analysis (TG/…
A significant amount of research has been published in recent years on Polarization - Depolarization Currents (PDC), although little has been published on simulating these processes in the laboratory. Over the past few years an ongoing project related to simple simulation models had been pursued and published. In this…
The influence of heat treatments in air on the surface and thermoelectric properties of polycrystalline silicon clathrate of nominal composition Ba8Al15Si31was investigated. The samples were prepared by combining arc melting and spark plasma sintering methods. Heat treatments were conducted in air at 873 K for 0-480 h…
Células a combustível de óxido sólido é uma tecnologia promissora de geração de energia limpa e utilizam zircônia estabilizada com ítria como eletrólito. Devido à alta temperatura de operação convencional, a busca por novos materiais de eletrólito tem sido feita e apontam a céria como um substituto. Entretanto, pós mi…
Abstract The paper reports the investigation of three umifenovir molecular complexes with dicarboxylic acids, prepared to improve the bioavailability of this drug. All three molecular complexes were investigated by powder X-ray diffraction, infrared spectroscopy, and solid-state nuclear magnetic resonance spectroscopy…
Filtering the wavelengths that do not generate electricity and the wavelengths that generate heat more than photonic current would reduce the photovoltaic (PV) module temperature and accordingly enhances its efficiency. In previous work, a wavelength-based thermoelectrical model for PV modules is proposed and experime…
PCBM is evaluated as a primary contact to CdTe due to its high valence band energy. PCBM films were characterized in terms of morphology, area coverage, thickness, electrical and optical properties, and used as a back contact for CdTe solar cells. PCBM solutions were developed by mixing PCBM with chloroform (CFM) and…