Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModifying role of alkali-metal cations in borate glass networksE. I. KamitsosCite this: J. Phys. Chem. 1989, 93, 4, 1604–1611Publication Date (Print):February 1, 1989Publication History Published online1 May 2002Published inissue 1 February 1989https://pubs.acs.org/doi/10.10…
The first measurements of the d.c. electrical conductivity and the low-frequency (static) dielectric constant of samarium phosphate glasses (in the composition range 5 to 25 mol% Sm2O3) are reported. A break in the slope of the Arrhenius plot divides the conductivity data into two temperature regimes, the conductivity…
The step-like change of the temperature at the field-induced first-order phase transition in the lead scandium tantalat (PST) ceramic is used for the electrocaloric refrigeration. The high values of the electrocaloric effect δT = 1.4 − 1.8 K at E = 15 − 25 kV/cm confirm a high efficiency of energy transformation in PS…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared and x-ray diffraction studies of a semirigid polyurethaneS. K. Pollack, D. Y. Shen, S. L. Hsu, Q. Wang, and H. D. StidhamCite this: Macromolecules 1989, 22, 2, 551–557Publication Date (Print):February 1, 1989Publication History Published online1 May 2002Published in…
Bacillus sphaericus 2362 is pathogenic for mosquito larvae and is being considered for large-scale production as a larvicide. The inability of the bacteria to metabolize carbohydrates requires that they be grown on proteinaceous media. This bacterium was found to be unable to transport glucose or sucrose into the cell…
Microphase separation in semidilute solutions of block copolymers in nonselective good solvent is analyzed. The swelling due to the presence of solvent is taken into account. The solvent effects on the thermodynamics in the disordered region and in the ordered region in the weak segregation limit are discussed. It is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA simple route to hexacarbonyldiiron complexes containing a bridging thiolate and an organic bridging ligand by means of [(.mu.-RS)(.mu.-CO)Fe2(CO)6]- intermediatesDietmar. Seyferth, Gary B. Womack, Colin M. Archer, and John C. DewanCite this: Organometallics 1989, 8, 2, 430…
The grain‐boundary mobility in magnesium aluminate spinel (MgO · nAl 2 O 3 ) of magnesia‐rich ( n < 1) and alumina‐rich ( n > 1) compositions has been measured from normal grain growth in dense, hot‐pressed samples. Over the temperature range 1200° to 1800°C, the mobility in magnesia‐rich compositions is found t…
Tungsten bronze ferroelectrics which have a morphotropic phase boundary (MPB) can have a number of enhanced dielectric, piezoelectric, and electrooptic properties compared to more conventional ferroelectric materials. The structural and ferroelectric properties of several MPB bronze systems are presented, including da…
The specific crude oil present is shown to have a major effect on the corrosion of steel in crude oil/brine production environments. The addition of crude oil to a brine (chloride-containing water) lowers the measured corrosion rate of steel exposed to the mixture, but different crude oils can have significantly diffe…
Highly conductive thin films of ZnO have been prepared by conventional electron beam evaporation on glass substrates. The Al 2 O 3 content of 0–5 wt% was added as dopant into ZnO to decrease resistivity of ZnO films. An Al-doped ZnO film with a resistivity of 1.0 × 10 -3 Ωcm is obtained at a substrate temperature of 3…
Concepts of the diffuse FE phase transitions are discussed and further developed. Frozen dipole moments, size of the polar regions, distribution of the FE moment inside of these regions, “FE-cluster” and “macrodomain” states, as well as the transition between them, phase transition of unknown nature and peculiarities…
The infrared spectra of silica gels made from alkoxides are different from those made from fumed silica, and from the infrared spectra of other amorphous silicas in which the SiO 2 network is relatively complete. One important feature of these spectra is the occurrence of an absorption band at 960 cm −1 due to the vib…
A coaxial air line was constructed to connect a radio-frequency impedance analyzer and a temperature-stabilized sample holder. It is suitable for dielectric measurements in the frequency range 1 MHz–1 GHz and at temperatures between 10 and 450 K. The dielectric dispersion of Fe-doped BaTiO3 and Na-doped KCN is present…
Perfluorooctylbromide: a new contrast agent for CT, sonography, and MR imagingRF MattreyAudio Available | Share
For most optical systems it is typically assumed that the transmitted wavefront has uniform for Gaussian) amplitude and constant polarization state. This is the default assumption of geometrical optics. This paper considers methods suitable for analyzing systems for which this assumption is not valid. Such methods of…
In paper I [Groma, Ungár & Wilkens (1988). J. Appl. Cryst. 21 , 47–53] a theory was developed to interpret the asymmetric X-ray line broadening of plastically deformed crystals. It was shown that the dislocation structure can be described by five distinct parameters, namely the dislocation density, the mean quadra…
Amines can be obtained from amides, nitriles, and nitroalkenes, alcohols from carboxylic acids, and sulfides from sulfoxides in good yields by use of the reducing agent LiBH4/Me3SiCl. Even α-amino acids can be easily reduced to amino alcohols with retention of optical purity. Compounds 1, 3, and 5 are examples of star…
Among the various high temperature polymers, those based on aromatic units, such as poly(2, 6-dimethylphenylene oxide) (PPO), poly(pheny1ene sulfide) (PPS), poly(ether ether ketone) (PEEK), and poly(ether sulfone) (PES), have attracted much attention in the last few years due to their good thermal and chemical resista…
The present work investigates the dynamics of the one-dimensional, unsteady flow of a spherical bubble cloud subject to harmonic far-field pressure excitation. Bubble dynamics effects and energy dissipation due to viscosity, heat transfer, liquid compressibility and relative motion of the two phases are included. The…