Materials Literature
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The surface-enhanced Raman scattering (SERS) spectra of nicotinamide adenine dinucleotide (NAD + ) at different pH values and electrode potentials were investigated at a silver electrode. For comparison purposes, the spectra of adenine, N -methylnicotinamide, and nicotinamide mononucleotide were also recorded. Good qu…
Complicated deep-etched structures having multiple heights and vertical/slanted walls have realized by fully-silicon-based batch fabrication process, which only needs lithography on a flat surface. Arbitrary numbers of mask layers were laminated on the initial surface of a substrate and deep-RIE, LOCOS or anisotropic…
This contribution describes an off-line partial discharge (PD) detection technique for large power transformers in the substation environment. It is demonstrated that off-line PD-analysis is one of the most meaningful method to assess the insulation condition of large power transformers. Details of an advanced PD-dete…
The ligand neopentyl 2,6-bis[(1-methylbenzimidazol-2-yl)]pyridine-4-carboxylate (L12) has been synthesised to test the effect of the chiral neopentyl ester group in the 4-position of the pyridine ring on (i) the helical wrapping, (ii) the diastereomeric induction and (iii) the thermodynamic and photophysical propertie…
The excited triplet state conformations of zinc and free base 5,15-diaryloctaalkylporhyrins are studied by experimental and computational (density functional theory, DFT) methods. From the observations of an unusual triplet state dynamics, i.e., fast nonradiative and biexponential decay, it has been suggested that the…
The correct model for the electromigration failure distribution is a key issue in reliability methodology. Usually, the failure times of a sample are fitted by a single log-normal distribution. However, in some cases relevant deviations can be found. In this paper two types of non-log-normal distributions observed on…
Three new µ3-oxo(trifluoroacetato) complexes [FeIII2MII(μ3-O)(CF3COO)6(H2O)3]·H2O [M = Mn (1), Co (2), Ni (3)] have been prepared. Compounds 1 and 2 crystallize in the monoclinic space groups C2/c [a = 22.002(5), b = 13.647(3), c = 24.767(4) Å, β = 98.23(3)°] and C2/m [a = 21.426(4), b = 15.100(2), c = 14.815(3) Å, β…
The development of surfactant-templated mesoporous films grown at the air/water interface was investigated using specular and off-specular X-ray reflectivity techniques. The samples were prepared in acidic conditions using cetyltrimethylammonium bromide (CTABr, 0.075 M) and different concentrations (0.27−0.88 M) of te…
Sugar-containing copolymer networks of poly(methacrylic acid- co -methacryloxyethyl glucoside) were prepared by free-radical photopolymerization. Incorporation of the MAA in the polymer networks rendered the networks complex forming, in response to the environmental pH change. Using ATR−FTIR spectroscopy, the polymer…
Tetrahedral [Zn4O(OAc)6]-clusters grow in alcohol in the presence of ErIII and SiIV ions to self-similar tetrahedral ZnO nanocrystals (with sizes d=5–6 nm). The nanoparticulate ZnO films prepared from these colloids show green ErIII fluorescence. The Klafter–Blumen theory is used to fit the fluorescence decay data. Fr…
We investigate the effects of polyethylene cylinder domain orientation and thermal history on the micromechanical deformation and fracture properties of poly(cyclohexylethylene)−poly(ethylene)−poly(cyclohexylethylene) (CEC) triblock copolymer where the poly(cyclohexylethylene) (PCHE) blocks are unentangled. The proper…
Leakage and breakdown characteristics of low-k dielectrics are becoming increasingly important reliability issues for interconnects as they are scaled to 0.18 um and below. Several of the low-k dielectrics, integrated into a dual-damascene Cu process flow, are quite leaky and have difficulty in meeting a leakage spec…
To study the water tree suppression in polymeric insulating materials, experiments were conducted on LDPE and XLPE specimens applying voltage stress of 3kV/mm for up to 1000 hours in copper sulfate solution and sodium chloride solution. The results demonstrate that XLPE specimens containing lipophilic surfactants with…
A development study has been completed on autogenous electron beam and Nd-YAG laser welding of niobium-1% zirconium (Nb-1% Zr) and molybdenum-44.5% rhenium (Mo-44.5% Re) thin sheet material. Specimens 0.5 mm thick were welded using both processes in a butt joint configuration. Mechanical tests were performed on welded…
This paper presents results from a long-term study of two different room temperature vulcanizing (RTV) silicone rubber (SIR) coatings. The RTVs were applied to identical longrod porcelain insulators and energized under natural outdoor conditions for a period of about nine years. In addition to being energized with AC…
This paper describes a new technique for detecting faulty components such as cracked insulators and faulty surge arresters on power lines. The technique utilises radio frequency (RF) pulses emitted from the faulty components as the monitoring parameter. The high frequency radio pulses are captured using a biconical an…
Investigations of the dielectric properties of SF/sub 6/, N/sub 2/ and mixtures have been carried out using a full scale model of a gas-insulated busbar (GIB). The breakdown characteristics under clean conditions are similar to those in a uniform field gas gap. The breakdown voltage is the maximum in SF/sub 6/ and the…
Partial discharges (PD) in void and electrical treeing were measured by using a computer aided measurement system. The results showed that the magnitude and the occurrence of PDs in voids were different from that of treeing PDs. Pulse-sequence-analysis and the PD distribution revealed the role of the instantaneous and…
The 60 Hz insulation loss current measurements in high voltage cable insulation containing water trees are described. To isolate the small insulation loss current from the significantly larger, quadrature (capacitive) current, a current-comparator-based high voltage capacitance bridge was used. It is shown that water…
Pre-selection tests on enameled copper wires to be adopted for windings of inverter driven rotating machines are generally performed applying quasi-square wave voltages to suitable specimens. This work experimentally investigates the influence of the factor "dv/dt" (or of the rise-time) characteristic of such quasi-sq…