Materials Literature
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The hydration behavior at 25°C of β‐dicalcium silicate synthesized from hillebrandite (Ca 2 ,(SiO 3 )(OH) 2 ) at 600°C was studied over a period of 224 d. The hydration rate of the β‐dicalcium silicate having fibrous crystals with specific surface area of 7 m 2 /g is extremely rapid. For water/solids ratios of 0.5 and…
Summary This paper presents a reliable model for the solubility products of scale-forming minerals. Our model solubilities are in relatively good agreement (±5% to 10%) with the most reliable solubilities in aqueous solutions of up to twice the seawater concentration at temperatures of 20 to 150°C and pressures up to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntrinsic (gas-phase) basicity of some anionic bases commonly used in condensed-phase synthesisDeborah Thomas Grimm and John E. BartmessCite this: J. Am. Chem. Soc. 1992, 114, 4, 1227–1231Publication Date (Print):February 1, 1992Publication History Published online1 May 2002…
Aluminum-doped zinc oxide films were prepared on Corning 7059 by an inexpensive spray pyrolysis technique. Variation in structural, electrical and optical properties with doping concentration is investigated in detail. The films were highly transparent to the visible radiation and electrically conductive. X-ray diffra…
Abstract Bi 2 Se 3 single crystals were prepared in the electron concentration range from 1.8 × 10 19 to 5.6 × 10 19 cm –3 . At room temperature experimental values are given for the specific electrical resistivity, for the Hall and Seebeck coefficients, and the ir‐plasma reflectivity spectra were measured in the wave…
The ir amide bands of the triple-helical polytripeptides and collagens upon hydration of films are investigated. On the basis of our assignment of the amide I components, the formation of hydrogen bonds between the peptide backbone and structural water is studied. The C1O1--HOH hydrogen bonds are found more ordered th…
Samples from ferralitic soils of similar texture were immersed in water, placed in a pressure chamber and subjected to different soil suction pressures (pF: 2.0, 2.5, 2.8, 3.0, and 4.2). The Cie color values (intensity, hue and saturation) were taken as the spectral signatures of these soils and calculated from the di…
The electrical and optical properties of calcium and cerium-doped yttrium aluminum garnet (Ca,Ce:YAG) have been studied. Ca,Ce:YAG is a mixed ionic and electronic conductor with an ionic conductivity activation energy of 4.3 eV. Evidence of cluster formation with a consequent higher-than-expected activation energy is…
A vacuum‐pressure slip‐casting technique and hot isostatic pressing (HIPing) were used to prepare high‐strength and translucent alumina ceramics. A low‐viscosity and high‐solids‐content slurry (46 vol% solids) was prepared, and a dense green compact was formed. The samples were sintered and subjected to capsule‐free H…
The pharmacokinetic properties of the x-ray contrast medium, iodixanol, a new nonionic dimer, were investigated in a phase I study including 40 healthy male volunteers. Iodixanol (300 mg I/mL) was administered intravenously (i.v.) at four dose levels--0.3, 0.6, 0.9, and 1.2 g iodine (I)/kg body weight--and saline was…
The disposal of polymer solid waste by means other than landfilling is necessary. The various approaches-source reduction, incineration, degradation, composting, and recycling-all have their roles and must be employed in an integrated manner. Where appropriate, recycling has ecological advantages, but its application…
Diffuse scattering data have been collected on two crystal forms of lysozyme, tetragonal and triclinic, using synchrotron radiation. The observed diffraction patterns were simulated using an exact theory for simple model crystals which relates the diffuse scattering intensity distribution to the amplitudes and correla…
Electroluminescence in porous silicon at room temperature has recently been achieved. This is a crucial step in the realization of silicon‐based optoelecctronic devices but there is still work to be done, for example in improving the stability of the electroluminscence. The materials, the effect, and the potential of…
During germination of spores of Bacillus species the degradation of the spore's pool of small, acid-soluble proteins (SASP) is initiated by a protease termed GPR, the product of the gpr gene. Bacillus megaterium and B. subtilis mutants with an inactivated gpr gene grew, sporulated, and triggered spore germination as d…
It is shown that for relatively more stable metallic clusters (those with magic number of atoms) the chemical hardness (I-A) too is relatively larger. Thus the occurrence of magic numbers for metal clusters whose stability is determined by their electronic shell structure can be understood as a manifestation of the pr…
Dielectric relaxation was previously reported in ${\mathrm{BaTiO}}_{3}$ and ${\mathrm{BaTiO}}_{3}$:Fe single crystals at radio frequencies [M. Maglione et al., Phys. Rev. B 40, 11 441 (1989)]. We have measured the dielectric dispersion in four ${\mathrm{BaTiO}}_{3}$:Nb samples (${\mathit{x}}_{\mathrm{Nb}}$0.3 at. %) a…
Hydrophobically-modified, water-soluble polyelectrolytes have been prepared by a micellar technique from acrylamide, n-decylacrylamide, and a third monomer, sodium 3-acrylamido-3-methylbutanoate, sodium acrylate, or sodium 2-acrylamido-2-methylpropanesulfonate. These terpolymers exhibit rheological behavior dependent…
Abstract FTIR studies of six partially-deuterated montmorillonites (MS) reveal the presence of two O-D stretching bands, one between 2702–2728 cm -1 and another near 2680 cm -1 . For homoionic (Li, Na, Mg, Ca, or La) Wyoming-type MS, the position of the higher frequency band, designated as (O-D) h , is between 2714–27…
A transient technique is used to measure the effective thermal conductivity of textile fabrics containing varying amounts of water. Conductivity increases with water content and also depends on a fiber's sorption properties. Wool, which is a highly absorbent fiber, has better insulating properties under moist conditio…
When the yarn sett of a woven fabric is systematically increased, there is also a systematic increase in the frictional resistance to motion, and it is greater for weft-over-weft motion than for warp-over-warp. The greater warp crimp producing a “knuckle effect” could be the explanation, although the diminishing space…