Materials Literature
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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…
Licht-Jäger und -Sammler: Der Transfer von Anregungsenergie von der Titelverbindung auf Rhodamin B erfolgt nach Gelbildung ausschließlich von den selbstorganisierten Nanostrukturen aus (Pfad a im Schema), und nicht von einzelnen Molekülen (Pfad b). Die Emission des Farbstoffs lässt sich somit thermoreversibel an- und…
Abstract By solid‐state 13 C‐ and 31 P‐NMR, XPS, and FTIR, the chemical structure of activated carbon fiber–P (ACF‐P) and its reaction with phosphoric acid were studied. Even when activated at low temperatures, these fibers developed a graphitelike carbon structure with a certain amount of phenol groups as well as ace…
Describes the objectives of a project, which are to design artificial limbs that are lightweight, compact and dexterous, that mimic human anatomy and maintain a high lifting capability. The key to satisfying these objectives is the use of shape memory alloy (SMA) artificial muscles as actuators. A general methodology…
Partial discharge monitoring is an effective on-line predictive maintenance test for motors and generators at 4160 volt and above, as well as other electrical distribution equipment. The benefits of online testing allow for equipment analysis and diagnostics during normal production. Corrective actions can be planned…
Abstract Ethylene vinyl acetate rubber (45% vinyl acetate content, EVA‐45) and organomodified clay (12Me‐MMT) composites were prepared by solution blending of the rubber and the clay. A combination of X‐ray diffraction, scanning electron microscopy, and transmission electron microscopy studies showed that the composit…
Yttria–zirconia and ceria–zirconia mesoporous thin films adopt either a cubic or 2D hexagonal mesostructure (see picture) depending on the quantity of water employed during the post-processing of the films. The hexagonal films are thermally stable above 400 °C, while the cubic forms retain their integrity up to 700 °C…