Materials Literature
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By considering the intermediate scattering function for simple liquids and suspensions of colloidal particles, we discuss and refute the idea that the short-time collective behavior of such systems is dominated by ’’free-particle’’ motions.
SYNOPSIS A glossary of Scottish mineral species, listing some 443 mineral names, and containing 399 valid species has been Compiled to fulfil a long recognized need. Wherever possible x-ray diffraction and chemical data have been used in the selection of the species. Entries for the glossary have been derived from an…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text Richard N. Brown, Bernard Bendow, Martin G. Drexhage, and Cornelius T Moynihan, "Ultraviolet absorption edge studies of fluorozirconate and fluorohafna…
Na 2 O· 3 SiO 2 glasses of high water content were prepared under high‐pressure, hydrothermal conditions. The sodium diffusion coefficient, DNa , in these glasses measured at 100°C depended strongly on H 2 O content. With increasing H 2 O content, DNa . at 100°C decreased initially to a minimum at 3∼4 wt% H,O and then…
The high‐temperature electrical conductivity in Fe 1−x O is analyzed at constant thermoelectric coefficient rather than at constant x. Small polaron conduction is p‐type with an activation energy of 15.4 kJ/mole (0.16 eV), independent of composition. The electrical properties are consistent with the clusters known to…
Abstract The polymerization of dissolved silica in aqueous solutions up to 100°C and containing up to 1 M NaCl has been studied experimentally, and theoretically. In this paper, the results of this work are presented in a form suitable for practical use in interpreting and predicting the chemistry of silica in geother…
Abstract The fluorescence lifetime of trans‐stilbene in solution was measured in the temperature range 300–80 K by three different methods. The decay was found to be mono‐exponential throughout, but prone to falsification by impurities, which may be responsible for the bi‐exponential decays reported by some authors. A…
<div class="htmlview paragraph">Six-component aerodynamic force and moment data are compared from tests of four 1/10-scale truck models at four wind tunnels on the North American Continent. Each model was tested in both a standard and a fuel saver configuration.</div> <div class="htmlview paragraph">…
The optical transmission loss spectrum of an arsenic sulphide glass fiber was measured in a wavelength region between 1.0 and 5.5 µm. Minimum losses of 92 dB/km at 1.85 µm, 78 dB/km at 2.4 µm and 164 dB/km at 5.3 µm were obtained in the fiber with a small tail on the band edge absorption. The fiber was drawn from a hi…
The susceptibility of sensitized Type 304 stainless steel and ASTM A508 Cl 2 steel to SCC in high temperature oxygenated water, as determined using constant extension rate tests, is found to depend upon the velocity of the fluid flowing past the gauge section. This work has demonstrated that in both cases, the failure…
Abstract Die Verbindungen M 4 [Ag 4 O 4 ] mit M LiCs und M 4 [Cu 4 O 4 ] mit M LiRb wurden erneut dargestellt; die Kristallstruktur wurde am K 4 [Ag 4 O 4 ] überprüft. Entgegen unserem ersten Befund [2, 3] (I 4 ) liegt in I 4 m2 zwar die Gruppe [Ag 4 O 4 ] 4− vor, doch sind je zwei O 2− (trans‐Stellung) etwas (0…
Nonferroic phase transitions are defined as the structural transitions occurring with a breaking of translational symmetry within the same crystal class. They involve no new macroscopic tensor components below the transition point, and they are generally identified experimentally through the onset of superlattice refl…
Sodium ion, cesium ion, and water self‐diffusion coefficients in a perfluorinated carboxylate polymer film have been measured. Results are compared to those obtained for a perfluorinated sulfonate polymer, Nafion. Both cation and water diffusion coefficients are very large in these materials in relation to the equilib…
Carbonate-containing apatites prepared from aqueous and non-aqueous media were investigated by ESR, IR, and X-ray diffraction. A typical asymmetric signal at g = 2.0, which many workers have observed in irradiated calcified tissues, is interpreted in terms of CO3(3)- and Co-2 and the trapped electron center, The CO3(3…
Abstract A series of interpenetrating polymer networks, IPN's, and semi‐1 IPN's of poly(n‐butyl acrylate) and polystyrene were prepared. The glass transition behavior via dynamic mechanical spectroscopy (DMS) and the morphology via transmission electron microscopy (TEM) were studied as a function of composition ratio…
Abstract Model hard segments having different chain length and chain terminating groups, such as methyl, ethyl, octyl, and octadecyl, have been synthesized from diphenyl‐methane diisocyanate (MDI) and butanediol and studied by DSC. In the case of short chain ends (i.e., methyl, ethyl, and octyl), hard segments having…
Effect of a transverse magnetic field on the suppression of thermal convection was investigated in a vertical column of melt under a destabilizing temperature gradient (β). The melt height and β were 2.5 cm and 16°C/cm, respectively. At , a turbulent thermal convection occurred as measured by a thermocouple inserted i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPyrazolyl-bridged iridium dimers. 2. Contrasting modes of two-center oxidative addition to a bimetallic system and reductive access to the starting complex: three key diiridium structures representing short nonbonding and long and short bonding metal-metal interactionsA. W.…
The kinetics of laser and furnace-induced solid phase epitaxial crystallization of As-implanted amorphous layers (∼0.16 μm) on Si (100) substrates was studied using a time-resolved optical reflectivity technique. Epitaxial rates from 10−10 to 0.2 cm/sec were measured over a temperature range from 750 to 1550 °K at two…
Abstract A synthesis of studies on the photocatalytic oxidation of various compounds (isobutane, propene, alkyltoluenes, butanols, ammonia, halide ions in aqueous solution) is presented, TiO 2 being the main photocatalyst. Comparisons are also made with other n‐type semiconductors: ZrO 2 , V 2 O 5 , Sb 2 O 4 , ZnO, Sn…