Materials Literature
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Partial discharge measurements performed at 0.1, 20, 50 and 300 Hz and at different voltage levels are compared with simulations based on models available in literature. It is shown that these models need to be improved to be able to fully extrapolate PD behavior at different frequencies. A solution based on a time-de…
We present a new method to characterize in-situ the optical thickness of porous alumina films by the use of photoluminescence-induced Fabry-Pérot-interferences. Additionally we show, that the use of different electrolytes yields different photoluminescence pattern. A second experiment allows to determine the degree of…
An experimental study of the crystal structure and the magnetic and elastic properties of the manganites Bi1−xSrxMnO3 is carried out. The following phase transformations are found: ferromagnet (x<0.15)–spin glass (0.15⩽x⩽0.25)–charge-ordered antiferromagnet (0.35⩽x⩽0.8). The ferromagnetic state corresponds to o…
Some of the problems facing partial discharge (PD) measurements in rotating machines, especially during online measurements are: i) calibration of the measurements; ii) high noise levels interfering with both the measurement system and the winding under the test; as well as iii) attenuation and distortion of PD signal…
The optical properties of vanadium oxide nanotube dispersions have been characterized using visible and near infrared absorption spectroscopy, Fourier transform infrared spectroscopy, Raman spectroscopy, and nonlinear transmission of optical intensities in the visible and near infrared. Using transmission electron mic…
Abstract A qualitative scheme that leads to the step‐by‐step construction of the band structure and Fermi surface of molecular conductors is developed based on a simple analytical treatment as well as some fundamental symmetry and overlap ideas and the concept of folding . This treatment is valuable in that it provide…
Abstract Based on the corrosion behaviour of stainless steels in fresh water and on the electrochemical properties of higher manganese oxides, the mechanism “Microbially influenced corrosion by manganese oxidizing microorganisms” (MIC by MOMOs) is presented as the consequence of biomineralized manganese oxides in cont…
One of the most promising tools for future applications in science and medicine is the use of nanotechnologies. Especially self-assembly systems, e.g., polyelectrolyte (PE) capsules prepared by means of the layer-by-layer technique with tailored properties, fulfill the requirements for nano-organized systems in a sati…
In this paper, existing domain‐switching criteria are briefly reviewed and the predictions based on these domain‐switching criteria are compared with the available experimental data for 180° and 90° domain switchings in lead lanthanum zirconate titanate (PLZT) and lead zirconate titanate (PZT), respectively. It is fou…
We report on the characterization of bulk and epitaxial ZnO films doped by nitrogen. The ZnO thin films were grown on GaN templates and on ZnO single crystals by vapor phase deposition using Zn and NO2/N2O as precursors. Nitrogen was introduced in the epitaxial films by a mixture of ammonia in the total N2 flow and by…
A systematic study of five different, symmetric bent-core liquid crystals in Langmuir thin films at the air/water interface is presented. Both the end chains (siloxane vs hydrocarbon) and the core (more or less amphiphilic) are varied, to allow an exploration of different possible layer structures at the interface. Th…
Abstract Silsesquioxanes are employed as ligand backbones for the synthesis of novel phosphite compounds with 3,3′‐5,5′‐tetrakis( tert ‐butyl)‐2,2′‐dioxa‐1,1′‐biphenyl substituents. Both mono‐ and bidentate phosphites are prepared in good yields. Two types of silsesquioxanes are employed as starting materials. The mon…
ABSTRACT Response surface methodology was employed to study the functional properties of starch acetate foams blended with 0, 7.5, and 15% wood, oat, and cellulose fibers. The blends were extruded with 14, 17, and 20% ethanol as a blowing agent, using a twin‐screw extruder with 160°C barrel temperature and 225 rpm scr…
Expansion of cellular polypropylene by the application of increased and consecutively reduced gas pressure was shown to result in samples which can be poled to significantly higher piezoelectric coefficients compared to untreated samples. In the present work, such pressure-treated samples were studied by quasistatic a…
The mirostructure and mechanical properties of duplex stainless steel (DSS) weldments, consisting of parent material type 2205 UNS S31803 welded using 22Cr - 3Mo - 8Ni filler, were studied after different aging treatments, over the temperature range 450 to 1050 ° C. The results showed that the welded specimens, genera…
Abstract Summary: A model system, consisting of a linear polymer dissolved in a bifunctional monomer/co‐monomer solvent, was selected to test the applicability of the Flory‐Huggins (FH) theory in the absence of the usual assumptions present in the analysis of modified thermosetting polymers. Solutions of two almost mo…
Fructose-1,6-bisphosphate (FBP) aldolase is an essential glycolytic enzyme that reversibly cleaves its ketohexose substrate into triose phosphates. Here we report the crystal structure of a metallo-dependent or class II FBP aldolase from an extreme thermophile, Thermus aquaticus (Taq). The quaternary structure reveals…
Random copolymers composed of diallyldimethylammonium chloride (DADMAC) and acrylamide with varying contents (8-100 mol %) of the cationic DADMAC component were alternated with polyanionic, fully charged poly(styrenesulfonate) to form multilayer thin films. UV-vis spectrophotometry, FTIR spectroscopy, and quartz-cryst…
SUMMARY The auxosporulation of Licmophora communis is allogamous and dioecious. Pairing between sessile, shortstalked cells of compatible clones is followed by meiosis and gametogenesis, to form two gametes in each gametangium. The behavior of the gametes differs between the gametangia. In the male gametangium, the ga…
Abstract Porous cyclic silsesquioxane (CSSQ) thin films containing nanopores (∼ 2 nm) with low dielectric constant ( k < 2.2), have been prepared by using various kinds of cyclodextrin (CD) derivatives as porogenic materials. The pore structure, including average pore size and interconnectivity, can be…