Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The pressure wave propagation method has previously been used to obtain a direct measurement of space charge injection into an epoxy resin at high divergent electric fields. Here we report the results of a series of experiments designed to investigate the extraction dynamics of such injected charge by following the de…
In the paper a possibility to determine the iron losses building factor is proposed. The used methodology, which has to be intended as a first approach to the problem, is based on a full experimental approach. Four wound cores, having the same geometrical dimensions, have been assembled as the addition of different nu…
Partial Discharges (PD) cause the degradation of insulating materials and govern the lifetime of high-voltage power apparatus and cables. Therefore, it is important to understand the PD behaviors in the aging process. In this paper, partial discharges and their current shapes of low-density polyethylene (LDPE) with a…
Topside metal helps spread the heat dissipated by HBTs and reduces both the thermal resistance at a given temperature, and its temperature dependence. In this paper we describe new methods for including topside metal cooling effects in both an electrical method of extracting HBT temperature and a geometry-based method…
Stator winding failures are generally attributed to groundwall or turn insulation failures. The failure mechanism involves the gradual development of a weakness in the insulation. This weakness is usually caused by a trapped void that is continuously enlarging due to ever increasing corona or partial discharge activit…
SrAl 12 O 19 :Pr phosphors have been investigated under ultraviolet/vacuum ultraviolet (5–20 eV) synchrotron radiation at room and near liquid He temperatures. The excitation of 1 S 0 → 1 I 6 and 3 P 0 → 3 H 4 emission of Pr 3+ in SrAl 12 O 19 occurs in a 1 eV wide region originating from the interconfiguration 4f 2 →…
The effect of corona discharge on the hydrophobicity of polydimethylsiloxane (PDMS) used as high-voltage (HV) insulation and the subsequent recovery of hydrophobicity when exposure ceases is now a well-known phenomenon. Surface characterization studies have established that corona exposure in the laboratory forms a br…
Much progress had been made during the last two decades of acoustic and optical methods for measuring charge distributions in dielectrics. A review on this topic is given, which covers mainly the past research activities associated with that at our laboratory. For acoustic methods, we will discuss and compare the PEA…
Reverse-Water-Gas-Shift reaction (RWGSR) was carried out over the ZnO, <TEX>$Al_2O_3,\;and\;ZnO/Al_2O_3$</TEX> catalysts at the temperature range from 400 to 700 ℃. The ZnO showed good specific reaction activity but this catalyst was deactivated. All the catalysts except the <TEX>$ZnO/Al_2O_3$</TEX> catalyst (850 ℃) s…
Abstract Syntheses of ten new tetranuclear complexes containing the [M A (μ 3 ‐O) 2 M B ] 8+ butterfly core [M A = M B = Fe III ( 1 and 2 ), M A = M B = Mn III ( 3 and 4 ) and M A = Fe III , M B = Mn III ( 5 − 10 )] using 1,4,7‐trimethyl‐1,4,7‐triazacyclononane (L) as the capping ligand, salicylaldoximato dianion (sal…
The decomposition of benzene was carried out using a plasma reactor packed with a mixture of BaTiO/sub 3/ and zeolite pellets, the zeolite-hybrid reactor. The reactor performance was characterized by measuring CO/sub x/ formed during plasma discharge and CO/sub x/ adsorbed on the solid surface. The decomposition effic…
Ferroelectric random access memories are non-volatile, low voltage, high read/write speed devices which have been introduced into the market in recent years and which show the clear potential of future gigabit scale universal non-volatile memories. The ultimate limit of this concept will depend on the ferroelectric li…
Abstract The results of in‐situ energy‐dispersive X‐ray diffraction under solvothermal conditions performed on isostructural, layered thioantimonates Mn 2 Sb 2 S 5 ·L (L = amine) demonstrate the great potential of the method. When the synthesis was carried out at low temperatures with L being 1,3‐diaminopropane (DAP),…
This paper introduces the project ADIAC (Automatic Diatom Identification and Classification), which started in May 1998 and which is financed by the European MAST (Marine Science and Technology) programme. The main goal is to develop algorithms for an automatic identification of diatoms using image information, both v…
Unprecedented metal-core architectures are exhibited by the title palladium cluster compounds, the structures of which consist of twinned cuboctahedral units. The Pd30 core (see picture) consists of two Pd13 fragments that form a Pd20 bicuboctahedron (blue) with six common atoms, in addition to six face-capping (orang…
Abstract New fluoro‐modified thermoplastic polyurethanes containing perfluoropolyether (PFPE) blocks were synthesized by the reaction of a fluorinated macrodiol with a hydrogenated prepolymer based on poly(tetramethylene glycol) and 4,4′‐methylene‐ bis ‐phenylisocyanate, followed by subsequent chain extension with 1,4…
The research into new materials with good thermoelectric properties has revealed new compounds consisting of metallic elements (Bando Y, Suemitsu T, Takagi K, Tokushima H, Echizen Y, Katoh K, Umeo K, Maeda Y and Takabatake T 2000 J. Alloys Compounds 313 1–6, Ghelani N, Loo S, Chung D, Sportouch S, Nardi S, Kanatzidis…
Dimethyl ether (DME) has received attention as an alternative, clean diesel fuel due to its thermal efficiencies equivalent to traditional diesel fuel, lower NOx emission, near-zero smoke and less engine noise.1,2 Consequently, the process of direct synthesis of DME from syngas has been investigated since Haldor Topso…
This paper proposes an approach to incorporate stray capacitances into a dynamic circuit model of high frequency transformers. The measuring techniques for stray capacitances in high frequency transformers and inductors are presented. A 500 W transformer in a full bridge inverter operating at 25 kHz has been simulated…
Electromigration in on-chip plated Cu damascene interconnections has been investigated for metal line widths from 0.24 /spl mu/m to 1.3 /spl mu/m. Void growth at the cathode end and protrusions at the anode end of the lines have been found to be the main causes of failure. The failure lifetime was found to decrease li…