Materials Literature
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The theory of the torque balance method for azimuthal anchoring energy measurements is investigated in detail under a general case of anchoring strength relationships between two substrates and a generalized relationship equation is deduced. As an example, azimuthal anchoring energies of several polyimide (PI) materia…
Abstract Complexes of vinylene-bridged bis- and tris(octaethylporphyrin)s (bis(OEP)–M and tris(OEP)–M) with d8 transition-metal ions (M = Ni(II), Pd(II), and Pt(II)) were synthesized. Metalation of (E)-bis(OEP)–H2 was carried out under the same conditions as for the corresponding octaethylporphyrin complex (OEP–M), to…
Photovoltaic devices remain an important aim for thin films of conjugated polymers. Here is reported the construction of devices with improved photovoltaic performance, which is achieved by blending elongated CdSe nanocrystals (see Figure) with regioregular poly(3-hexylthiophene). Improved transport arising from dense…
A finite two-dimensional (2D) foam sample bounded by walls contains inner bubbles (I-bubbles) and peripheric or edge bubbles (E-bubbles). We derive equations for the rate of area change of both types of bubbles, which depend linearly on the number of neighbours of a bubble but are. in general, not scale independent. F…
Control over surface texture in thin film production is necessary for preparing smooth films (e.g., for optical surfaces), but also where some roughening of the surface is required (e.g., patterning for liquid-crystalline display devices). These authors have found a way to control nanoscale roughening by adsorbing neg…
The prooxidant/antioxidant imbalance in familial adenomatous polyposis (FAP) is suggested by (i) the intimate connection between APC and prostaglandin H synthase-2 genes, (ii) the increase of the free radical-generating enzyme xanthine oxidase, and (iii) the decrease of antioxidant defences. In this research work we e…
A study of variations in IR absorption characteristics of fabrics with moisture regain and fiber type is discussed. Infrared spectral absorptivities of fabrics are measured over the range of wavelengths from 0.7 to 25 microns. These values are used with the normalized emission characteristics of blackbody emitters to…
Spectroscopic investigations of Cr3+ doped ZAPH are carried out. From the nature of optical absorption bands and their splittings at the liquid nitrogen temperature, the site symmetry of the Cr3+ in ZAPH is attributed to orthorhombic distortion.
Two linepipe steels with carbon mass contents of 0.09 and 0.15% were subjected to steady state unidirectional solidification in a special apparatus. The specimens were positioned in alumina tubes of 15 mm internal diameter, and were pulled downwards at a constant rate, R , from the high temperature furnace. The temper…
Glyceraldehyde-3-phosphate dehydrogenase was purified from Clostridium acetobutylicum by sequential ammonium sulfate precipitation, gel filtration and anion-exchange chromatography (to a specific activity of 27 U mg-1). The enzyme had a molecular mass of 40 kDa as determined by SDS-PAGE and a native molecular mass of…
One series of two-ring and two series of three-ring liquid crystal compounds, all containing omega, alpha, alpha-trihydroperfluoroalkoxy terminal tails, were prepared and characterized by IR, NMR, MS and elemental analysis. Their phase transition behaviour was investigated by DSC and polarizing optical microscopy. Bip…
By analyzing experimental data in the literature, the activation energy H for slip in body-centered cubic metals is found to approximately obey the simple relation H≈0.1 μb3(1−t)2, where t is the applied stress normalized by the zero-temperature Peierls stress, μ is the 〈111〉 shear modulus, and b the 1/2〈111〉 Burgers…
Indium-doped zinc oxide (ZnO:In) films were prepared by simultaneous r.f. and d.c. magnetron sputtering. The structural, optical and electrical properties of the films have been obtained by x-ray diffractometry (XRD), Rutherford backscattering spectrometry (RBS), spectrophotometry and atomic force microscopy (AFM) tog…
Article LETTERS. Thermal expansion of silicate liquids: Direct determination using container-based dilatometry was published on July 1, 1999 in the journal American Mineralogist (volume 84, issue 7-8).
Abstract A unidirectional continuous carbon fiber reinforced polyimide composite is fabricated using the PMR‐15 polyimide as a matrix. Mechanical and dynamic mechanical properties of the composite are studied. The effect of variation of the fiber content ranging from 55% to 70% by volume on the properties of the compo…
A method for the design of cutoff filters is proposed that is based on the use of light at nonnormal angles of incidence and on the use of coating materials with a large dispersion of the optical constants. The optical constants are presented of several films made from indium tin oxide--a material that satisfies this…
It was found that the sintered , which was not perovskite‐type but fluorite‐type, permeated hydrogen under atmosphere at 1050–1800 K. Three tube‐shaped specimens (ϕ 0.287 × 0.894 cm) (SP I, SP II, SP), the lengths of which were 1.40, 0.37, and 1.45 cm, were prepared. The nonexistence of micropores in specimens was con…
Recent developments in our understanding of the relative importance of temperature-dependent charge transfer and luminescence recombination probability in quartz have shown the latter to be the dominant effect in experiments using a heat treatment (preheat) before optically stimulated luminescence (OSL) measurement. T…
A one‐chamber solid oxide fuel cell (working in a methane‐air mixture) with yttria‐stabilized zirconia (YSZ) electrolyte was modified by adding oxide to the anode (Pt) and cathode (Au). It was determined that the addition of MnO 2 to both electrodes significantly improved the cell discharge characteristics. The short‐…
Tyrosine aminotransferase catalyzes transamination for both dicarboxylic and aromatic amino-acid substrates. The substrate-free Escherichia coli tyrosine aminotransferase (eTAT) bound with the cofactor pyridoxal 5'-phosphate (PLP) was crystallized in the trigonal space group P3(2). A low-resolution crystal structure o…