Materials Literature
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Four poly(oxymethyleneanthrylene)s were prepared by polycondensation of 9,10-diacetoxyanthracene (and a substituted analogue) with α,ω-dibromoalkanes. Two model compounds were also synthesized by the same procedure. Although non-conjugated the polymers could be doped with iodine. The redox reaction of doping was confi…
Silicon nitride–silicon carbide (Si 3 N 4 –SiC) nanocomposites were fabricated by a process involving reaction bonding followed by superplastic sinter‐forging. The nanocomposites exhibited an anisotropic microstructure, in which rod‐shaped, micrometer‐sized Si 3 N 4 grains tended to align with their long axes along th…
Flux and iron loss distributions of three-phase reactor are analyzed using the finite element method considering 2-D B-H curves and iron losses in arbitrary directions which are measured up to high flux density. It is shown that the total iron loss of reactor yoke does not change so much by the yoke dimension, althoug…
A recently developed method for fitting a Monte Carlo computer simulation model to observed single-crystal diffuse X-ray scattering has been applied to (h0l) scattering data obtained for the disordered compound p-methyl-N-(p-chlorobenzylidene)aniline, C14H12ClN (ClMe), at 295 K. Each molecular site is occupied by a mo…
Electron beam interactions with specimens in the scanning electron microscope (SEM) can lead to increased surface temperatures and damage. These changes may have significant consequences in the analysis of bone tissue. An investigation was performed to measure the surface temperature changes associated with the electr…
Although titanium alloys have been widely used for aerospace applications, they have seldom been used in armor systems. In an effort to provide increased information to armored vehicle designers, the U.S. Army Research Laboratory (ARL) and the U.S. Department of Energy's Albany Research Center (ARC) performed a joint…
Transparent blend films were prepared from poly(vinyl alcohol) (PVA) and polysarcosine (PSA), i. e. poly(N-methylglycine). Miscibility between PVA and PSA was investigated by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and scanning electron microscopy (SEM). It was revealed that PVA is…
We theoretically analyze the performance of optical thin-metal-clad waveguide polarizers with emphasis on the effect of dielectric-cover-layer (i.e., superstrate) thickness. We show that the polarization extinction ratio can be theoretically made infinite by selection of metal film thickness and polarizer length for a…
A critical review of former investigations on the cationically induced oligomerization of N -vinylformamide points out that some of the results are not in agreement with the model of an cationic propagation mechanism. Special attention in the discussion of the results is given on the chain structure of the oligo( N -v…
Most studies about lime requirement and the pH buffering capacity of soil have either calibrated buffer solutions to soil-CaCO3 reactions or have correlated pH buffering with soil properties such as clay and organic matter content. A different approach is to address two fundamental questions: where do OH− ions react w…
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The microstructural changes that occur during hot deformation of Ti-6A1-4V alloy with β transformed (βt) and equiaxed α+β ((α+β)e) starting microstructures have been modeled in the temperature range 750-1100°C and strain rate range 0.0003-10 s-1. The stress-strain behavior, the kinetic parameters, and the processing m…
E-Z photoisomerizable chiral dopants are a class of materials that can be used to prepare birefringent optical components with patterned optical properties. Two new photoisomerizable chiral dopants have been synthesized and analysed. The materials were derived from nopinone and camphor. The properties of these compoun…
Europium doped Al2O3 photoluminescent coatings have been prepared by an ultrasonic spray pyrolysis process, using a solution of 0.05M of AlCl3 · 6H2O as starting material and EuCl3 as doping. These films were deposited on Pyrex glass substrates at atmospheric pressure using purified air as a carrier gas. All films wer…
We show that the transition temperature ${T}_{c}$ of Nb-doped strontium titanate thin films grown in vacuum by pulsed laser deposition is similar to bulk and that these films follow a similar dependence of ${T}_{c}$ on the carrier density as bulk. We have measured the temperature dependence of the upper critical field…
The syntheses of the first examples of aromatic thiazole-containing porphycene analogues 3 have been accomplished by oxidation of the corresponding 3,20:10,13-diepithio-6,9:16,19-diimino-1,11-diaza[20]annulenes 9 with DDQ. Compounds 9a−c have been synthesized by McMurry coupling reaction of the diformylated 2-(1H-pyrr…
Electrostrictive ceramics based on Pb(Mg(1/3)Nb(2/3 ))O(3) have demonstrated promise as low-frequency active materials. They broaden the range of design options by providing a mix of properties unavailable in traditional piezoceramics. Typical properties are: 1000 microstrain on the interval 0-1 MV/m with a k(33) of 0…
A flow reactor for evaluation of low surface area, model catalysts has been designed. The aim is to measure catalytic activity at atmospheric pressure on nanofabricated model catalysts, primarily made by the electron-beam lithography (EBL) technique. This is a challenge because of the low attainable active surface are…
Investigations of the Fermi surface of a new organic metal: (BEDT-TTF)4[ Ni(dto)2] , M. Schiller, W. Schmidt, E. Balthes, D. Schweitzer, H.-J. Koo, M. H. Whangbo, I. Heinen, T. Klausa, P. Kircher, W. Strunz
Orotidine-5'-monophosphate decarboxylase (ODCase) from Methanobacterium thermoautotrophicum has been crystallized with and without the inhibitor 6-azaUMP by the vapour-diffusion method. In the absence of the inhibitor, the protein crystallizes in space group P4(1)2(1)2 (unit-cell parameters a = b = 56.9, c = 124.5 A)…