Materials Literature
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There are two fundamental considerations in preparing samples for electron probe microanalysis (EPMA). The first one may seem obvious, but we often find it is overlooked. That is, the sample analyzed should be representative of the population from which it comes. The second is a direct result of the assumptions in the…
This paper presents detailed morphological descriptions of three small Navicula species that occur rather abundantly in the brackish Baltic Sea, and probably also in brackish waters elsewhere. Two of these, N. sjoersii and N. bossvikensis, are described as new taxa. A morphologically similar species, N. perminuta Grun…
Abstract In situ synchrotron radiation structure analyses of a light-induced radical pair from o-Cl-HABI were performed by using an X-ray vacuum camera at 23–70 K at the BL02B1 station of SPring-8. The combined results of X-ray analysis with theoretical calculation, IR, and UV-vis spectroscopy reveal that a slight con…
Cellulose membranes formed by Acetobacter xylinum under known cell density in a culture medium were characterized. A dead end testing unit was used for water flux and filtration of Chlorella sp. and bovine serum albumin (BSA). This study found that the cells formed membranes faster in sucrose supplemented coconut juic…
To study the strong magneto-volume effects observed in CrTe and MnAs with NiAs-type crystal structure, first-principle band calculations are carried out by a self-consistent linear muffin-tin orbital method within the atomic sphere approximation. The equilibrium volume of the unit cell is obtained as a function of the…
When complexed PSS/CTAB is coadsorbed onto silica, a long-range, predominantly electrosteric repulsion is measured which decays exponentially with surface separation. Adsorption is driven by locally hydrophobic, surfactant-rich regions along the PSS chain. These anchor the PSS chain to the surface, resulting in a clas…
The rheological behaviour and mechanical properties of the polycarbonate/high density polyethylene/glass fiber (PC/HDPE/GF) composites have been studied, along with fiber-resin interface behaviour. Maleic anhydride grafted low density polyethylene (LDPE-g-MAH) was used as a compatibilizer in the composites. A study of…
The failure of a viscoelastic material, such as solid propellant, is a complex phenomenon with a requirement to address the following two fundamental and complementary aspects in the failure criteria. First, what is the failure criterion for a solid propellant in stress–strain space, and what are the variations in fai…
This work proposes a new approach, based on the reaction Si 3 N 4 + 2B 2 O 3 + 9C → 3SiC + 4BN + 6CO, to synthesize an SiC–BN composite. The composite was prepared by reactive hot pressing (RHP), at 2000°C for 60 min at 30 MPa under an argon atmosphere, following a 60 min hold at 1700°C without applied pressure before…
Transverse sections of the (11–20) cuts of a 6H-SiC substrate-porous SiC layer-epitaxial 6H-SiC layer structure were studied using electron microscopy. An intermediate layer is revealed between pores and unetched SiC which consists of a damaged region containing two-dimensional defects and a completely amorphous regio…
The determination of nitroxide concentrations and distributions across plaques of polycarbonate/acrylonitrile-butadiene-styrene copolymer blend (PC/ABS) containing a high molecular weight hindered amine stabilizer (HALS) exposed to thermal and photochemical degradation treatments by EPR and EPR imaging (EPRI) is repor…
Ultrasonic irradiation in the presence of ozone was used to efficiently eliminate methyl tert-butyl ether (MTBE) from groundwater. The sonolytic degradation of MTBE was investigated in three different reactor configurations and frequencies: vibrating-plate reactor (VPR, 358 kHz), near-field acoustical processor (NAP 2…
An automobile bumper is a structural component, which contributes to vehicle crashworthiness or occupant protection during front or rear collisions. The bumper systems also protect the hood, trunk, fuel, exhaust and cooling system as well as safety related equipments. A brief description of bumper components and a cri…
In order to investigate the corrosion of pipeline materials in Seabed Sediment (SBS) environment, weight-loss and electrochemical measurements in saturated sand and mud cells with seawater were performed for a simulation. The used electrochemical measurements included linear polarization resistance (LPR) and potentiod…
Reflectivity spectra of HxWO3 and LiWO3 thin films were measured over the photon energy range from 0.4 to 4.2 eV. It was found that microcrystalline tungsten bronzes have reflectances of 8%-30% over the dopant concentration range x (0 < or = x < or = 0.25). Values for the real part of refractive index n were also dete…
Advanced experimental techniques to measure the spectral absorption and oxidation state of silicate glass melts are described. Exemplary results of the characterisation of industrial glass melts by these two methods are presented. The technological impact of the high-temperature optical properties and oxidation state…
Several of the fourteen rare-earth element (plus Sc and Y) orthophosphate standards grown at Oak Ridge National Laboratory in the 1980s and widely distributed by the Smithsonian Institution's Department of Mineral Sciences, are significantly contaminated by Pb. The origin of this impurity is the Pb2P2O7 flux that is d…
We study the formation of the icosahedral Al-Cu-Fe quasicrystalline phase in heat-treated elemental multilayers. Pure quasicrystalline films can be obtained in similar annealing conditions independently of the stacking sequence of the multilayers. Using synchrotron radiation diffraction, we study in real time the succ…
The renormalization of the elastic constants of a polymer-anchored membrane is investigated by means of systematic Monte Carlo simulations. Our results indicate that when polymers are grafted on both sides, and are in the brush regime, the excess bending rigidity scales as N 3 σ α ( N and σ being the number of statist…
The linear thermal expansion of lead halide (PbCl2, PbBr2, PbI2) crystals was measured between room temperature and their melting points. Using the temperature dependence of linear thermal expansion Δl/l, the coefficients of linear thermal expansion α and their temperature dependencies were calculated and the results…