Materials Literature
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Moisture has strong influence on insulation performance of oil-pressboard system in power transformer. Moisture in oil and pressboard can be obtained from Oommen paper oil equilibrium curves under constant temperature condition. Temperature of power transformer is related to its load and the atmospheric temperature. I…
In order to guarantee reliable industrial power supply, predictive maintenance for generator becomes highly necessary. This measure is expected to reduce disruptive generator due to degraded insulation of its stator winding. Partial discharge (PD) is responsible for this disadvantage condition. The objective of this p…
Partial discharge (PD) monitoring plays an important role in the online maintenance of the gas insulated switchgear (GIS). In recent years, the ultra high frequency (UHF) method for PD detection arouses great interest of many researchers because of the high sensitivity and anti-interference capability. The coupling of…
This paper deals with PD current pulse waveforms of environmental friendly gases such as N2, CO2, dry air, and CF4gas that were measured with the SHF_PDPW (Super High Frequency wideband PD current Pulse Waveform measurement) system. This specially developed system enables us to obtain accurately PD current pulse wavef…
ZnO varistors are used extensively as the surge suppressor in the form of surge arresters in the power protection against lightning, temporary over-voltages, switching surges, transients, etc. In this research, DC degradation process at 50 mA/cm2for 115 hours and restorability by heat-treatment at 800 oC for 24 hours…
This paper is devoted to a comparative study of partial discharge (PD) characteristics initiated in pressboard/mineral oil and pressboard/vegetable oil insulating systems. We mainly analyze the average number N and maximum apparent charge qap.maxof discharges versus the voltage. The results are discussed with respect…
Partial discharge (PD) measurements can be regarded as an effective and reliable tool for on-line condition monitoring and asset management of high voltage (HV) apparatus. Recently, a novel application is observed in the monitoring of falling trees on covered-conductor (CC) overhead distribution lines. In this paper,…
We studied how to measure the secondary electron emission (SEE) of metal and insulating materials used for satellite thermal insulation or other such purposes. SEE yield measurement is very important for analyzing charge accumulation on the satellite surfaces due to the space environment because electron emission for…
Power transformers are considered to be one of the most critical components of a power system. Due to ageing the majority of transformer populations are at or approaching their anticipated design lives, causing growing concerns over possible consequential impacts to system reliability. It is essential for utilities to…
In this paper, a new designed acoustic emission (AE) wideband amplifier and waveguide are used to locate the partial discharge (PD) signal in cast-resin dry-type transformer. When PD events occur in a cast-resin dry-type transformer, it is often accompanied by electromagnetic and ultrasonic signals. The AE method can…
A novel amphiphilic copolymer, folate-poly (PEG-cyanoacrylate-co-cholesteryl cyanoacrylate) (FA-PEG-PCHL) was synthesized as liposomal modifying material with folate receptor targeting and long circulating property. FA-PEG-PCHL-modified docetaxel-loaded liposomes (FA-PDCT-L) were prepared by organic solvent injection…
Using a spin-forming-extended method, which is one of the template grain growth methods, one-directional grain-orientation control was performed in (Sr,Ca)2NaNb5O15(SCNN) ceramics. Rod like templates were prepared by the one-step flux method using the mixed salts of KCl and NaCl. In order to obtain the SCNN templates…
Amorphous SiO2 powders having two kinds of medium range order (MRO) were subjected to pulse laser ablation in water (PLAL) for X-ray diffraction, transmission electron microscopy and spectroscopy characterization. The powders fragmented down to 10-20 nm in size are mainly hydrogenated amorphous phase retaining Si-2nd…
Nanofibers with ordered inorganic nanoparticles inside are great interesting for their potential applications in biomedical and photonics. In this work, yardlong-bean shaped nanofibers were fabricated by the combined technology of surface-initiated atom transfer radical polymerization (ATRP) and coaxial electrospinnin…
A preliminary study of the magnetic phenomenology of Fe and Fe90Co10 nanospindles with axial ratio equal to 5 is presented. These nanospindles are constituted by single-domains single-crystals coated by oxide surface layer and assembled in chains into the nanospindle. The thermal dependence of the coercive field and t…
The research and development of rare earth catalytic materials will greatly promote the high-efficiency utilization of abundant rare earth elements, such as La and Ce. Rare earth elements have under-filled 4f orbits and lanthanide contraction, resulting in their unique catalytic performances when used as an active com…
Quantum Dots have shown remarkable potentials in biomedical research. Herein, we reported the effects of CdTe quantum dots (QDs) and CdTe@SiO2 nanoparticles (NPs) on human embryonic kidney 293 (HEK 293A) cells with the aim of investigating their in vitro cytotoxicity. The CdTe@SiO2 particles were prepared by reverse m…
Background Cyclosporine A (CsA), a potent immunosuppressive agent, has several adverse effects. Mild myelotoxicity and splenic toxicity has been reported after the administration of CsA. Fucoidan (FU) is a sulfated polysaccharide extracted from marine algae, and it has numerous biological activities, acting as an anti…
Potassium niobate-based ceramics with 0.1 wt % MnCO 3 , K (1+ x ) NbO 3 +MnCO 3 0.1 wt % (KN10000 x +Mn, x = 0.0000–0.0010), were fabricated using KHCO 3 powder as a starting material. The KN10000 x +Mn ceramics were basically fabricated using a conventional ceramic fabrication process and MnCO 3 powders were added at…
Introduction Infection of endoprostheses is a serious complication in orthopedic surgery. As silver is known for its antibactierial effects, silver-coated endoprostheses have gained increased attention to decrease infection rates. However, cytotoxic effects of silver on bone cells have not been investigated in detail.…