Materials Literature
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Studies were conducted on the effect of cold work on stress corrosion cracking (SCC) of API X52 steel. For comparison, measurements were made on specimens with no notch and that were not cold-worked. The time to failure of cold-worked specimens was always shorter than that of the as-received specimens. Hydrogen conten…
Abstract Dynamic mechanical analysis was used to study the viscoelastic properties of two novel highly filled phosphate glass‐polymer melt blends to accelerate efforts to optimize their melt processing. The melt of one blend was thermally stable while that of the other blend was not, as evidenced by modulus growth ove…
Abstract The crystallization kinetics of previously oriented poly(ethylene terephthalate) (PET) sheets have been studied under unconstrained conditions, as functions of stretch ratio, mode of extension, and crystallization temperature. Isothermal and dynamic crystallization conditions have been utilized for the determ…
A simple theoretical model for the origin of spontaneous polarization in nanocrystals is developed. We propose that the origin of the spontaneous polarization is in the boundary layer between “cap” and the nanocrystal, and the internal electric field in the dot is due to the piezoelectric effect caused by the strain e…
Abstract The porosity and the formation factor of water-saturated porous glass specimens made from sintered spherical grains are determined from the dielectric dispersion measurements of the specimens. This is done by fitting the Mendelson et al. theory for a water-saturated porous glass specimen to the experimental d…
The novel compounds K2AuPS4 (1), Tl2AuPS4 (2), K2AuAsS4 (3), and KAu5P2S8 (4) have been synthesized by direct reaction of the elements with a molten alkaline polythiophosphate(arsenate) flux at 550°C. The crystal structures of these compounds have been determined by single-crystal X-ray diffraction techniques. 1, 2, a…
Thianthrene - 2,3,7,8 - tetracarboxylic dianhydride - 5,5,10,10 - tetraoxide (TADATO), a dianhydride having two sulfonyls between two phenyl rings, was synthesized and polymerized with several diamines by a two-step method. Tough polyimide membranes were obtained with flexible diamines but not with rigid diamines. Mos…
Patterns of N mineralization and P release were determined in two characteristic soils of the Andean-Patagonian Region (Andisol) and the transitional zone to the steppe (xeric Mollisol) amended with fish residues and biosolids. Residues were applied to the soils at rates of 10–20 g kg-1 and incubated for 112 d under c…
Methods developed originally to analyze domain motions from simulation [Proteins 27:425–437, 1997] are adapted and extended for the analysis of X-ray conformers and for proteins with more than two domains. The method can be applied as an automatic procedure to any case where more than one conformation is available. Th…
Sulfonated manganese(III) tetraphenylporphyrin supported on Amberlite IRA-900 ion exchange resin (MnTPPS-Ad) has been found to be a highly active and stable catalyst for olefin epoxidation and alkane hydroxylation by sodium periodate.
There has been a longstanding debate and controversy in the literature with regard to the determination by XPS of the exact oxidation state of a molybdenum species commonly observed in the passive films of stainless steel. In this paper we have compared both the XPS and ESR analyses of molybdenum oxyhydroxides previou…
We introduce a semischematic mode-coupling model to describe the slow dynamics in molecular liquids, retaining explicitly only the description of the center-of-mass degrees of freedom. Angular degrees of freedom are condensed in a $q$-vector independent coupling parameter. We compare the time and $q$ dependence of the…
The sintering behavior of Sr x Ba 1− x Nb 2 O 6 (SBN) ( x = 0.5, 0.6, and 0.7) was studied. The densification rate increased and the evaluated activation energy of SBN decreased as the Sr:Ba molar ratio increased. Also, when SBN50 (SBN where x = 0.5) was sintered at <1300°C, the densification rate decreased as the…
In Acetonitril wurde aus AsCl3 und Natriumphenolat zuerst Cl2AsOPh erzeugt, das dann mit PPh4Se5 und schließlich mit Na2Se zu PPh4[Se5AsSe] umgesetzt wurde. Mit Na2S anstelle von Na2Se wurde PPh4[AsSe6–xSx] erhalten, wobei der Schwefelgehalt mit höherer Reaktionstemperatur und -dauer zunimmt (x = 0,21 bis 1,09). Mit P…
CdS nanocrystals were prepared in chelate polymer microparticles, and characterizations of the CdS/polymer hybrids were performed by absorption microspectroscopy, optical microscopy, and transmission electron microscope measurements. When CdS nanocrystals were prepared by the reaction of Cd 2+ −polymer beads with a di…
It is shown that HOPG electrochemically intercalated by mixtures of sulfuric and formic acids exfoliates at room temperature, leading to “pneumatic” expanded products, in which CO bubbles are trapped between graphene layers sewn at their edges by oxygen bonds.
A new system of recycling expanded polystyrene has been developed which uses limonene orange oil as a solvent to recycle high grade polystyrene. Life cycle assessment was applied to this system to simulate its effect on the environment. It is shown that the new system has a lower greenhouse effect (−30%), acidificatio…
Absorption, excitation, emission spectra and lifetime measurements of cerium doped calcium metaphosphate glass in the concentration range 3.83x10 18 -6.34x10 20 ions cm -3 are investigated. The ultraviolet absorption spectra reflects the 4f→5d transitions where the 5d state is split into five levels due to the cubic c…
Consolidation and fracture dynamics in nanophase amorphous Si3N4 are investigated using 106‐atom molecular‐dynamics simulations. At a pressure of 15 GPa and 2000 K, the nanophase system is almost fully consolidated within a fraction of a nanosecond. The consolidation process is well‐described by the classical theory o…
The structure of silicon boride, ${\mathrm{SiB}}_{3},$ is based on 12-atom, boron-rich icosahedra in which silicon atoms substitute for some boron atoms. Raman bands associated with vibrations of icosahedral atoms in ${\mathrm{SiB}}_{3}$ are quite broad, reflecting this substitutional disorder. Comparing the Raman spe…