Materials Literature
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Abstract The formation of polyelectrolyte complexes of glycol chitosan (GlChi) with sodium salts of dextran sulfate (DS), carboxymethyl cellulose (CMC), polygalacturonic acid (GalUA) n , and alginic acid (AlgA) has been studied. The number of ionizable groups per pyranose ring and the degree of dissociation as a funct…
<div class="htmlview paragraph">The purpose of this paper is to describe the advantages and validity of substituting the high-performance zinc casting alloys, ZA-12 and ZA-27, for bronze in selected low-speed, medium temperature bearing and bushing applications.</div> <div class="htmlview paragraph">…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase-dependent stereochemistry and chemical activation in the thermal decomposition of 2,3-diazabicyclo[2.1.1]hexeneMoon Ho Chang and Dennis A. DoughertyCite this: J. Am. Chem. Soc. 1982, 104, 4, 1131–1132Publication Date (Print):February 1, 1982Publication History Publishe…
The ground-state transition is observed in the double-charge-exchange reaction $^{48}\mathrm{Ca}$($^{18}\mathrm{O}$, $^{18}\mathrm{C}$) $^{48}\mathrm{Ti}$ at 100 MeV. A mass excess of 24.82 \ifmmode\pm\else\textpm\fi{} 0.30 MeV is measured for $^{18}\mathrm{C}$.NUCLEAR REACTIONS $^{48}\mathrm{Ca}$($^{18}\mathrm{O}$, $…
A statistical experiment has been conducted to investigate the influence of silica fillers on the mobility of poly(vinyl chloride -co-vinyl acetate) molecules as reflected in glass transition temperatures. Measurement of glass transitions was made graphically from DSC curves. The data showed that the glass transition…
The effect of applied potential on the Intergranular stress corrosion cracking (IGSCC) of sensitized Type 304 stainless steel has been studied in deaerated dilute Na2SO4 solution at 285 C using constant deflection (single and double U-bend specimens) and constant load (as polished and preoxidized specimens) techniques…
Theoretical packing densities are derived for dense random packing of hard spheres for single‐valued and for multivalued particle diameters. The optimum particle‐size distribution for maximum density is calculated. The results are compared with packing densities for close‐packed arrangements. The results may be useful…
The effect of copper (metallic and up to 1 ppm. dissolved in solution), temperature (60 C to 90 C), and pH (6 to 9) on hydrogen formation from mild steel in oxygen free water was investigated. The formation rate was found Independent of temperature not only up to 90 C, but a comparison with work elsewhere indicates th…
The crystallization of Bombyx mori L. silk fibroin was carried out from a regenerated solution maintained in contact with air under a steady-state flow. The nucleation occurs at first close to the solution surface after a few seconds of stirring and then a fibrillar crystal propagates. The nucleation was considered to…
It is shown that semiflexible polymers exhibit lyotropic liquid crystallinity once a threshhold solution concentration is surpassed. These polymers, namely polyisocyanides, polyorganophosphazenes, polyacenaphthylene, and cellulose derivatives, are characterized by persistence lengths or characteristic ratios experimen…
Heteroepitaxial films of GaP were grown on Si (100) substrates by molecular beam epitaxy (MBE). The GaP films were single crystalline in the growth temperature range from 300°C to 590°C. These films had a tendency to have flat surfaces at lower growth temperatures. Sn was doped as n-type dopant of GaP films in the car…
Abstract The elastic modulus E l of crystalline regions of poly(butylene terephthalate) in the direction parallel to the chain axis has been measured by the x‐ray diffraction method. Values of E l for the ( 1 04) planes of the α‐ and β‐form crystal modifications were 13.5 X 10 4 and 21.0 X 10 4 kg/cm 2 , respectively.…
Oxorhodoporphyrin dimethyl ester, a porphyrin containing electronegative groups in opposite pyrrolic rings, has been synthesized by the oxidative cyclization of a bilene- b . Rhodoporphyrin and its 2-vinyl analogue, two important degradation products of chlorophyll a, and the phaeopor- phyrin derivative of bacteriochl…
The modification of polymer surfaces by gas plasma treatment is reviewed. The two regimes of major interest are radio-frequency at low pressure (about 1 torr) and corona discharge at atmospheric pressure. The reactions produced by plasmas at polymer surfaces are due to both radiation and chemically active species crea…
<div class="htmlview paragraph">This paper describes the performance and emissions of a spark-ignited engine using a dual-Fuel mixture of petrol and a small flow rate of hydrogen. Such an engine can be run at all speeds with a wide-open throttle and the specific fuel consumption and B.T.E. figures indicate a gre…
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…