Materials Literature
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Abstract Blown film properties depend on the thermo-mechanical history experienced by molten polymer during biaxial deformation. In this study on-line birefringence measurements along the length of the bubble in film blowing of a linear low density polyethylene (LLDPE) were carried out in order to assess the stress le…
Abstract Irradiation of either o-hydroxphenyldiazomethane or benzofuranone in argon matrix at 10 K generates benzoxetene which is in photoequilibrium with o-quinone methide.
A study was carried out to detect partial discharge signals generated in a gas-insulated substation (GIS) subjected to an insulation spacer method (internal electrode method), and to determine whether or not partial discharges were generated and then locate them with a pattern recognition method using a neural network…
The Cu 2P 3/2 photoelectron spectra were acquired to study the coordination state and oxidation state of Cu in ZSM-5 in the NO reduction by propene in the presence of excess oxygen. Two peaks at higher binding energy (937 eV) and lower binding energy (934.3 eV) were found to be changed in intensity depending on the tr…
The use of ammonium nitrate as an oxidizing agent in hydrothermal oxidation of organic compounds was investigated. The oxidation of model compounds, methanol, acetic acid, and phenol, was studied at 500 °C and 345 bar. High organic, ammonia, and nitrate removal was achieved at stoichiometric concentrations. The oxidat…
NPT Monte Carlo simulations of racemic mixtures were performed on a simplified model for the enantiomers. The molecules were spheres of equal size, interacting via a modified LennardJones potential. The interaction strength and the optimum distance between heterochiral molecules (D and L) differed (by a factor e and a…
The reflectance spectra of the superionic glasses x CuI·(1 − x )Cu 2 MoO 4 ( x = 0.4, 0.5) have been measured in the mid- and far-infrared range to investigate the structure of the oxyanion matrix and the nature of sites hosting the charge carrier copper ions. The analysis of the mid-infrared spectra revealed the pres…
In the Pantocsek Collection, slides with material from tertiary deposits include some cyclotelloid species belonging to the family Thalassiosiraceae. They are distinguished from other genera in the family by a combination of characters, some of them present in either Stephanodiscus, Cyclostephanos, Cyclotella or Plioc…
New multicomponent InF3-based bulk glasses have been investigated. The molar composition of the base glass is 28% InF3–20% ZnF2–16.5% BaF2–12% GaF3–9% PbF2–6% NaCl–5% SrF2–3% CaF2–0.5% PrF3. A number of variations of the base glass were prepared and their refractive indices and densities measured. Resistance to crysta…
Samples of PVC cling films were taken at importers, wholesalers and retail shops, and their overall migration to the alternative food simulant iso-octane was measured, after establishment of a correlation between overall migration to olive oil at 40 degrees C in 10 days and to iso-octane in 2 h. Results of the migrati…
The Flory–Huggins interaction parameters χ for 23 gases (He, Ne, Ar, Kr, Xe, H2, N2, O2, N2O, CO2, CH4, C2H4, C2H6, C3H6, C3H8, 1,3-C4H6, four C4H8's, n-C4H10, iso-C4H10, and n-C5H12) in five rubbery polymers (1,2-polybutadiene (PB), poly(ethylene-co-vinyl acetate)) (EVAc), polyethylene (PE), polypropylene (PP), and p…
The tungstorhenate(V) heteropolyanion [W(9)ReO(32)](5)(-) has been isolated as guanidinium and cesium salts from reaction of [ReO(2)(PPh(3))(py)(3)](+) with sodium tungstate. Crystallographic analysis of black Cs(5)[W(9)ReO(32)].3H(2)O [triclinic, P1 or P&onemacr;; a = 10.194(1), b = 11.503(2), c = 9.682(1) Å; alpha =…
Theoretical values for the thermomechanical properties of poly(ethylene terephthalate) (PET) are determined self-consistently using the pcff force field to compute the potential energy and quasiharmonic lattice dynamics to determine the vibrational free energy. Complete sets of lattice constants, thermal expansion coe…
The effect of oxygen vacancy on the enhancement of activity of CO−NO−O 2 reaction over yttria-stabilized zirconia (YSZ)-supported CuO catalyst was investigated in the present study. The catalysts were prepared by the impregnation method, and their characteristics were studied by temperature-programmed reduction. The c…
To clarify the effects of glass composition and heat‐treatment conditions on phase separation and crystallization, time–temperature–transformation (TTT) diagrams for the system (65 − x )SiO 2 ·25B 2 O 3 ·(10 − y )Na 2 O· y CaO· x ZrO 2 , which is used for fabricating alkali‐durable porous glasses, were determined. The…
Navicula gibbula Cleve and its allies have a number of morphological characters which are visible under the light microscope and distinguish them from taxa included in Navicula Bory sensu stricto. These include proximal raphe ends which are sharply and unilaterally hooked and often extend beyond the central area, as w…
The order−disorder transition has been studied in two AB 3 miktoarm stars of styrene and isoprene with SAXS and rheology. A mean-field theory has been developed to treat the most general case of miktoarm stars: A m B n ( m ≠ n ) which provides the phase stability criteria and the static structure factor in the disorde…
Supersaturated Fe-Pd solid solutions were prepared by mechanical alloying. X-ray diffractometry showed that the as-milled alloys were bcc from 0--26 at. % Pd. Saturation magnetization measurements and M\"ossbauer spectrometry measurements were performed on these powders. Consistent interpretations of both sets of meas…
The interfacial chemistry of solvent cast films of block copolymers of poly(ethylene oxide) (PEO) and poly(lactic and glycolic acid) (PLGA) have been investigated over a wide range of compositions. X-ray photoelectron spectroscopy (XPS) and static secondary ion mass spectrometry (SSIMS) were utilized to provide both e…
The deformation mechanisms active in the eta- and alpha-lamellae of a Ti2 48 at.%Al alloy during room-temperature and 800 C tensile loading have been determined by transmission electron microscopy. A marked change in the plastic behaviour of the alpha-phase has been detected between room and elevated temperature, wher…