Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The thermal behavior of NO on (flat) Pd(111) and (stepped) Pd(112) has been investigated by temperature programmed desorption (TPD), high resolution electron energy loss spectroscopy (HREELS), and Auger electron spectroscopy (AES) techniques. NO is shown to adsorb molecularly on both Pd(111) and Pd(112) in the tempera…
Ultrasonic foam processing of polyurethane for reaction injection moulding (RIM) was studied experimentally to investigate feasibility of ultrasonic bubble nucleation in polyurethane. Bubble nucleation was also studied theoretically to predict the rate of nucleation. Classical nucleation theory and cluster theory have…
Abstract Nonisothermal curing kinetic data obtained from differential scanning calorimetry (DSC) for a rubber compound are corrected for the effects of temperature lag between the DSC sample and furnace. The method of Eder and Janeschitz-Kriegl, which is based on experimental data alone without reference to any kineti…
A new projection description for a cubic quasiperiodic crystal (CQC), including a projection matrix, diffraction-intensity calculation and a linear phason matrix, has been proposed. The simulated electron diffraction patterns with appropriate phason parameters agree well with the experimental ones obtained for a rapid…
Abstract Results of a high‐temperature Raman spectroscopic investigation up to 522 K carried out at ambient pressure on an antiferroelectric PbHfO 3 multi‐domain single crystal are reported. The changes in the Raman spectral features show that temperature‐induced phase transitions occur at 435 ± 1 and at 484 ± 1 K. Th…
Abstract Chain scission was observed during the crystallization of p‐xylene in dilute polystyrene solutions. Degradation yields were determined by gel permeation chromatography, as a function of the number of freeze‐and‐thaw cycles, polymer concentration, and initial polymer molecular weight ( M ). The rate constant f…
The fatigue behavior of a silicon carbide fiber reinforced glass ceramic matrix composite, SiC/CAS subjected to tension-compression cycling was investigated. Two laminate lay-ups were studied—cross—ply, [0/90] 2 s and unidirectional, [0] 16 . At first, the fatigue limit based on one million cycles was established for…
General corrosion tests of Type 304SS, Alloy X750 and Stellite #6 used for BWR primary component materials were performed under various conditions of simulated BWR primary water. The authors' interest was focused on the corrosion behavior, such as metal release and the buildup of corrosion oxide film. It was possible…
Abstract The low frequency dielectric properties of polymeric blends of polycarbonate (PC) and acrylonitrile‐butadiene‐styrene (ABS) were studied in the temperature interval of 100 to 170°C. Attention was focused on a 60/40 (m/m) PC/ABS blend. The results were compared with dynamic mechanical measurements in torsion a…
Abstract The presence of a fragipan horizon in the soil profile restricts plant growth and limits nonagricultural uses. This is of special concern in the Piemonte region, in northwestern Italy, where the soil of numerous areas is reported to have a fragipan. Four sites were selected for this study with the aim of asce…
Crystals of CsMgCl3 containing Gd3+ and Er3+ exhibit UV emissions from excited Gd3+ ions when the 4S3/2(E) (546-nm) and the 2H11/2(F) (522-nm) states of Er3+ are pumped by pulsed laser excitation. The Gd3+ long-lived emissions that appear at 281 nm (τ = 6 ms) and 313 nm (τ = 3 ms) are assigned to the 6I7/2(C) and the…
A grating interferometer that uses all-reflecting optical components has been developed for operation in the extreme and far UV. The instrument uses a V-groove, ruled grating as its beam splitter and has no moving parts. A self-compensating optical design is employed that makes it tolerant to small misadjustments of o…
Fibrous monolithic ceramics were fabricated in the alumina/nickel system. The microstructure consists of high‐aspect‐ratio polycrystalline cells of alumina separated by thin cell boundaries of nickel. The nickel content in the material is 3 to 8 vol%. The fibrous monolith with uniaxially aligned cells fails noncatastr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh Modulus and High Tg Thermally Stable Polymers from Di-p-ethynylbenzoyl Ester Monomers: Synthesis, Solid State Polymerization; Processing, and Thermal PropertiesAnastasios P. Melissaris and Morton H. LittCite this: Macromolecules 1994, 27, 10, 2675–2684Publication Date (…
Currently, applications of conducting polymers look promising because of the significant advances made in improving the stability and processing characteristics of these materials. The author discusses some of the developments which have taken place and looks at several applications, including power equipment, light e…
A monoclinic crystal of hen egg lysozyme (HEL, E.C. 3.2.1.17) was obtained at 313 K from a 10%(w/v) NaCl solution at pH 7.6 containing 5%(v/v) 1-propanol. Cell dimensions were a = 27.23, b = 63.66, c = 59.12 A and beta = 92.9 degrees, and the space group was P2(1). The unit cell contains four molecules (V(m) = 1.79 A(…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterfacial Free Energy between Hard-Sphere Solids and FluidsD. W. Marr and A. P. GastCite this: Langmuir 1994, 10, 5, 1348–1350Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published inissue 1 May 1994https://pubs.acs.org/doi/10.1021/la00…
Abstract It was found that at low residual strains, the modulus of double network rubbers can be less than that of an isotropic elastomer of equal crosslink density. At higher residual strains, the equilibrium modulus is higher for the double network. This aspect of the behavior of networks was investigated using two…
Slow strain rate tests of cold-worked X-52 carbon (C) steel showed stress corrosion cracking (SCC) could be induced in dilute aqueous sulfate solutions at 50°C. The crack growth rate was of the same order of magnitude reported previously for carbonated solutions. Cracking susceptibility increased for potentials more a…
Significant discrepancies were generally reported in the dynamics of BaTiO 3 between results deduced from various experimental techniques. Here dielectric and quasi-elastic light scattering measurements are investigated on high-quality BaTiO 3 crystals. We show that two relaxators have to be introduced below the soft-…