Materials Literature
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Small amounts of Li 2 O result in sintering in the AIN‐Y 2 O 3 ‐CaO and AIN‐CaO systems at firing temperatures <1600°C. The effect is ascribed to reduction of the liquidus temperature. Furthermore, Li 2 O is removed by volatization at temperatures from 1300° to 1600°C, and its content decreases several ppm from the…
Small cylindrical tubes were sintered in a microwave‐ induced oxygen plasma, initiated and sustained inside a tunable, single‐mode cavity. Temperature and shrinkage measurements of the specimens were achieved using an optical‐fiber thermometer black‐body sensor and a dilatometer, respectively. Sintering experiments at…
We present a simple treatment of the depletion-driven demixing transition in isotropic and perfectly aligned binary hard-rod mixtures. The simplicity is mainly due to the fact that we use the second virial approximation to the Helmholtz free energy in combination with a convenient Legendre transform. This combination…
The corrosion behavior of nitrogen ion (N2+)-implanted AZ91D magnesium alloy (UNS M11916) in 5 wt% sodium chloride (NaCl) solution was investigated using weight-loss measurement and electrochemical techniques. Ion implantation improved corrosion resistance at doses &gt; 1 x 1016 ions/cm2 (6.5 x 1016 ions/in.2). At…
An equilibrium domain theory is used to calculate the thickness and temperature dependencies of relative domain populations in tetragonal ferroelectric thin films epitaxially grown on cubic substrates. The relative coherency strain between the film and substrate that governs domain configurations is evaluated with the…
Abstract Scale formation of calcium carbonate on tube walls is studied in a once‐through flow system under isothermal conditions. The effects of supersaturation ratio, flow velocity and liquid temperature on the deposition rates are investigated. For relatively small supersaturation ratios (in the range 3.5 to 8) the…
An off-lattice pseudocontinuous model for semiflexible polymerlike micelles with excluded volume interactions is presented. Expansion factors are determined for the radius of gyration squared and for three different characteristic point-point distances squared. They are found to scale with an exponent in agreement wit…
The electrochemical behavior of chemically vapor deposited tungsten films in solutions of interest to tungsten chemical mechanical polishing has been investigated using dc potentiodynamic polarization, linear polarization, and Tafel methods. It was found that in the absence of an oxidizer, the tungsten surface was pas…
The recent novel temperature modulated differential scanning calorimetry (MDSCTM TA Instruments Inc. USA) technique has been applied to the measurement of the thermal properties of chalcogenide glasses of the As-Se system in the glass transition region. All samples in this work were given the same thermal history by h…
Supramolecular wires and channels are one‐dimensional molecular materials capable of transporting charge, etc. in a predefined direction. Examples are given of wires and channels that have been formed by self‐assembly in the liquid‐crystalline state or in solution, for example from alkoxy‐substituted triphenylenes (se…
Abstract cis- and trans-bis(1-methyl-2-imidazolyl)tetraethyltetramethylporphyrin Mg complexes were prepared. 1H NMR, absorption, and fluorescence spectra suggest that Mg has a high tendency toward dimer formation through coordination from imidazolyl to metal in a similar way to Zn, and accepts further the sixth coordi…
Abstract We describe the synthesis of micro‐phase‐segregated block‐copolyesterurethanes from telechelic hydroxyterminated poly{[( R )‐3‐hydroxybutyric acid]‐ co ‐[( R )‐3‐hydroxyvaleric acid]} (PHB‐diol) as “hard segments” (i. e., crystallizable chain sections) and hydroxyterminated poly(ε‐caprolactone)‐diethylene gly…
To further investigate the ways in which proteins respond to changes in the length of the polypeptide chain, a series of 32 insertions and five deletions were made within nine different alpha-helices of T4 lysozyme. In most cases, the inserted amino acid was a single alanine, although in some instances up to four resi…
Electrical transport in zinc oxide varistors is simulated using two-dimensional Voronoi networks. The networks are assumed to contain randomly distributed grain boundaries of three electrical types: (1) high nonlinearity (i.e., ‘‘good’’) junctions; (2) poor nonlinearity (i.e., ‘‘bad’’) junctions; and (3) linear with l…
The rheological properties of nonaqueous silicon nitride powder suspensions have been investigated using steady shear and viscoelastic measurements. The polymeric dispersant, Hypermer KD‐3, adsorbed strongly on the powder surfaces, and colloidally stable, fluid suspensions up to a volume fraction of φ= 0.50 could be p…
A trichloroacetic-acid-soluble 14.5-kDa protein (p14.5) has been isolated from human mononuclear phagocytes (MNP) by a combination of trichloroacetic acid extraction, preparative electrophoresis and hydrophobic affinity chromatography; five tryptic peptides were subjected to protein sequencing. The full-length cDNA of…
The Curie temperature of normally sintered and hot‐pressed Pb 1‐x Ba x Nb 2 O 6 ( x = 0.30, 0.37, 0.41, and 0.50) was dependent on the sample preparation conditions. Samples with large amounts of pores and cracks had higher Curie temperatures than dense samples. Dense samples with fine grains had higher Curie temperat…
The tungsten divertor experiment at ASDEX Upgrade , R Neu, K Asmussen, K Krieger, A Thoma, H-S Bosch, S Deschka, R Dux, W Engelhardt, C García-Rosales, O Gruber, A Herrmann, A Kallenbach, M Kaufmann, V Mertens, F Ryter, V Rohde, J Roth, M Sokoll, A Stäbler, W Suttrop, M Weinlich, H Zohm, M Alexander, G Becker, K Behle…
, This paper addresses the development of an image analysis technique for direct tracking of fibers in an assembly. The algorithms are evaluated using simulated images presented in an earlier part of the series. The tracking method appears to be extremely efficient in determining fiber orientation distribution in nonw…
The purification and opening of carbon nanotubes via bromination is reported. Refluxing raw cathodic soot containing a mixture of nanotubes, nanoparticles, and amorphous carbon in liquid bromine, followed by oxidation in air, is shown to yield 10–20; w/w pure and opened nanotubes. The role of bromine in the purificati…