Mica
A paper describing several micas, which have been used in the insulation systems of high power rotating machines for many years.
Materials Literature
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CO3 substitution in apatite further insight from new crystal-chemical data of Kasekere (Uganda) apatite
The vibrational and structural characteristics of a CO3-rich apatite from an extrusive carbonatite in Kasekere, Uganda, were studied by infrared and Raman spectroscopy, single-crystal X-ray diffraction and electron microprobe analysis. Electron microprobe analysis provided, based on Σ(large cations) = 10, a cation con…
Enzymatically catalyzed synthesis of photocrosslinkable oligophenols
The HRP-catalyzed oligomerization of cinnamoyl-hydroquinone-ester and cinnamoyl-4-hydroxyanilide led to the formation of soluble polyphenols. The oligomers were synthesized in water/1,4-dioxane and in water/acetone mixtures and characterized by NMR, FTIR and SEC. Upon UV-treatment of the homogenous films the polypheno…
Comprehensive ESR study of the antiferromagnetic ground states in the one-dimensional spin systems (TMTSF)2PF6, (TMTSF)2AsF6, and (TMTTF)2Br
Detailed electron spin resonance experiments have been performed on single crystals of $(\mathrm{TMTSF}{)}_{2}{\mathrm{PF}}_{6},$ $(\mathrm{TMTSF}{)}_{2}{\mathrm{AsF}}_{6},$ and $(\mathrm{TMTTF}{)}_{2}\mathrm{Br}.$ These low-dimensional organic compounds undergo transitions to incommensurate and commensurate antiferro…
A Room-Temperature Discotic Nematic Liquid Crystal
Das Einführen verzweigter Alkylketten am Phenylkern des Substituenten R bei Hexaalkylbenzolen (siehe Formelbild) erwies sich als Schlüsselschritt bei der Synthese des ersten bei Raumtemperatur diskotisch-nematischen Flüssigkristalls. Eine Flüssigkristallanzeige mit diesen Eigenschaften bietet gegenüber herkömmlichen A…
Stress distribution in thin heteroepitaxial diamond films on Ir/SrTiO3 studied by x-ray diffraction, Raman spectroscopy, and finite element simulations
The residual stress in thin diamond films with a strongly improved heteroepitaxial alignment has been studied by x-ray diffraction and micro-Raman spectroscopy. The measurements have been compared with the predictions from finite element simulations. The diamond films have been deposited by microwave plasma chemical v…
Synthesis and Characterization of Organotin Substituted Heteropolytungstophosphates and Their Biological Activity
Organotin‐substituted Keggin or Dawson tungstophosphates [(CH3OOCCH2CH2Sn)3–(PW9 O34)2]9−, [(CH3OOCCH2CH2Sn)PW11O39]4−, [(CH3OOCCH2CH2Sn)P2 W17O61]7−, [(CH3OOCCH(CH3)CH2Sn)3(PW9 O34)2]9−, [(CH3OOCCH(CH3)CH2Sn)PW11O39]4− and [(CH3OOCCH(CH3)CH2Sn)P2W17 O61]7− have been prepared by reactions of the β–methoxycarbonylethyl…
Magnetic properties of Sm- and Cu-doped oriented SmCo5 ribbons prepared by melt spinning
Oriented melt-spun ribbons with composition Sm1+Y(Co1−XCux)5 (X=0–0.3 and Y=0–0.2) were fabricated with a wheel speed of 5 m/s, followed by annealing in the temperature range of 600–1000 °C for 30 min. Our results show that a high degree of texture, in which the c axis is parallel to the longitudinal direction of the…
Carbon Nanotubes as Nanoreactors for Boriding Iron Nanowires
Iron boride nanowires are synthesized here by reaction of Fe-filled carbon nanotubes with boron oxide vapor. The thus formed FexB nanowires are encapsulated within the nanotubes (see Figure) and their diameter is approximately that of the starting material, demonstrating that the reaction is confined within the nanotu…
Nature of self-diffusion and viscosity in supercooled liquid water
The nature of the simplest transport processes in water, namely, self-diffusion and shear viscosity, is analyzed on the basis of a version of the microinhomogeneous structure model. The study predicts the existence of locally ordered groups of molecules, taking into account considerations of acoustic properties, light…
Investigation of the structure of tungsten oxide films obtained by chemical vapor deposition
Thin amorphous and polycrystalline tungsten oxide films have been prepared by Chemical Vapor Deposition (CVD) from metallorganic precursor − tungsten hexacarbonyl − at atmospheric pressure. The dependence of the composition and the structure of tungsten oxide films on the technological conditions has been investigated…
Selection of the wavenumbers k using an optimization method for the inverse Fourier transform in 2.5D electrical modelling
Abstract An optimization method is used to select the wavenumbers k for the inverse Fourier transform in 2.5D electrical modelling. The model tests show that with the wavenumbers k selected in this way the inverse Fourier transform performs with satisfactory accuracy.
Study of Occupational Sites and Dielectric Properties of Ho–Mg and Ho–Mn Substituted BaTiO3
The effect of re-oxidation treatment on the solubility in dopants and the dielectric properties of Ho–Mg- and Ho–Mn-substituted BaTiO 3 was investigated. The lattice parameter and electrical resistivity results indicated that the predominant occupational sites of Ho ions changed from A -sites to B -sites by increasing…
Fragipan Degradation and Nodule Formation in Glossic Fragiudalfs of the Lower Mississippi River Valley
Glossic Fragiudalfs comprise several million hectares of agronomically important soils within the silty uplands of the lower Mississippi River Valley (Major Land Resource Area [MLRA] 134). These soils are typified by a fragipan within 100 cm of the surface overlain by a 5‐cm‐thick, or more, glossic horizon containing…
Insulation integrity of GIS/GITL systems and management of particle contamination
An investigation of particle contamination in uniform and coaxial fields.
Lipase-catalyzed polymerization of diethyl carbonate and diol to aliphatic poly(alkylene carbonate)
Diethyl carbonate (DEC) and diols, such as 1,3-propanediol and 1,4-butanediol, were polymerized by a lipase at a temperature between 40 and 80°C to yield the corresponding aliphatic polycarbonates in a successive two-step polymerization. Bulk polymerization, especially at a temperature between 70 and 75°C, and prefera…
Atomistic simulation of shear in a martensitic twinned microstructure
Molecular-dynamics simulations are used to apply shear to the twinned microstructure of an hcp metal, represented by a Finnis-Sinclair-type potential for zirconium. The twinned microstructure results from a simulated martensitic phase transition from the high-temperature phase, and hence contains some boundary defects…
A powder diffraction study of the phase transition in LaAlO3
The structure of LaAlO 3 has been investigated around the phase transition at T c ≈ 800 K by neutron powder diffraction in vacuum and by X-ray powder diffraction under nitrogen atmosphere as well as by a very high resolution synchrotron experiment in air. The results were analysed in frame of the Landau theory using t…
Solubility behavior of water in haploandesitic melts at high pressure and high temperature
The solubility of H 2 O in three melt compositions along the haploandesite join Na 2 Si 4 O 9 - Na 2 (NaAl) 4 O 9 (0, 3, and 6 mol% Al 2 O 3 ) was determined as a function of pressure and temperature from 0.8 to 2.0 GPa and 1000 to 1300 °C. Water solubility is a linear (or near-linear) positive function of pressure (1…
Wave front control systems based on modal liquid crystal lenses
We describe two electro-optical systems for adaptive focusing of linearly polarized light. The aperture size is 5 mm and the focal length can be varied from 1 to 4 m for wavelengths from 0.663 to 0.85 μm. The first is a commercially available system including a PC compatible control unit and software, and an adaptive…