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。
Duplex stainless steel is widely used in various service conditions due to its high mechanical properties and high corrosion resistance. However, there have been few studies on the corrosion resistance of duplex stainless steel in highly oxidizing nitric acid, such as hot nitric acid containing Cr6+ ions. In this stud…
The dynamic-compression properties of carpet are expected to play an important role in their mechanical performance, but it is difficult to measure these properties at frequencies and pressures corresponding to those occurring in carpet wear. A new vibration technique has been developed which enables the dynamic modul…
Structural data have contributed greatly to the understanding of the oxide superconductors. However, it is increasingly clear that a knowledge of the average structure is not sufficient. Structural defects, which are present in essentially all of these systems, have a profound effect on the superconducting properties.
Abstract The magnitudes of the peak intensities in a powder diffraction pattern are not uniformly distributed as a function of diffraction angle. The Lorentz-polarization factor, X-ray form-factor and the thermal vibration parameters all conspire to progressively decrease the intensities of the peaks as sinθ/λ increas…
Experiments in which 25- mu m-thick films of tetrafluoroethylene-per-fluoromethoxyethylene copolymer (Teflon PFA) were charged positively and negatively with a constant-current corona at different temperatures and subsequently discharged are discussed. The time behaviors of surface potential, total current, and conduc…
Infrared spectra of adsorbed dinitrogen on Ru metal supported on Al2O3 and MgO are observed for the first time at 2214 cm–1 for Ru/Al2O3, at 2168 cm–1 for Ru/MgO and at 1910 cm–1 for Ru–CsOH/MgO.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiffusion of bis(2-ethylhexyl) phthalate above and below the glass transition temperature of poly(vinyl chloride)Robson F. Storey, Kenneth A. Mauritz, and Brian B. ColeCite this: Macromolecules 1991, 24, 2, 450–454Publication Date (Print):January 1, 1991Publication History P…
The complexes [Co(pc)(NO2)(py)]·dce, [Co(pc)(NO2)(py)]·thf, and [Fe(pc)(NO2)(py)](pc = phthalocyaninate, py = pyridine, dce = 1,2-dichloroethane and thf = tetrahydrofuran) have been isolated as stable crystalline materials. Their molecular and electronic structures have been investigated by IR and UV/VIS spectra, X-ra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrodynamic properties of polystyrene in dilute n-butyl chloride solutionMichael E. Lewis, Shouyan Nan, and Jimmy W. MaysCite this: Macromolecules 1991, 24, 1, 197–200Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 J…
Various organocobalt(III) porphyrins have been synthesized in good yields through the hydrometallation of a hypothetical hydridocobalt(III) porphyrin intermediate.
The state of CuO deposited on alumina depends on the copper loading: at low loadings (CuO content smaller than 6 wt%), copper is present in the form of Cu2+ ions formed by exchange with the hydrogen atoms of the alumina hydroxyl groups, whereas at high loadings, the formation of bulk copper oxide is observed and the h…
Gastropod apertures reflect expanded states of their mantle edge under variable boundary conditions. The apertures are divided into two groups: apertures without distinct overlap zones (e.g., whorl overlap) and those with overlap zones. Each group follows a unique morphological rule. Apertures without overlap zones ar…
5,10,15,20-Tetrakis(para-substituted phenyl)porphyrinatoiron(III) chloride complexes catalyse the reduction of styrene with NaBH4 to ethylbenzene and 2,3-diphenylbutane and the precursor is assumed to be the σ-alkyl complex (Xtpp)FeIII–PhCHMe.
Present works describe the improvement of the magnetic properties of Sm(Fe, Ti)12 melt-spun ribbons with ThMn12-type structure. In order to increase the remanence, the Ti content was decreased and the heat treatment temperature and time were lowered and shortened, respectively. As a result, the maximum energy products…
Abstract Samples of polyaromatic amines were synthesised by chemical and electrochemical methods, using different amounts of electrolytes for the purpose of doping the polymer. These polymers were found to show electrical conductivity in the range 10 −12 –10 −6 S/cm. A study of conductivity at various temperatures ind…
Abstract Crystallization behaviour of isotactic polypropylene/linear low density polyethylene (iPP/LLDPE) blends has been investigated by optical microscopy and DSC. Crystallization of iPP depends upon blend composition and thermal history. When blended with LLDPE, the crystallization temperature of iPP, T c , decreas…
Abstract Relying on a semiempirical Pariser‐Parr‐Pople (PPP) model, it is shown that classical valence bond (VB) theory, using only a few covalent structures, can provide highly correlated energies and wave functions and thus a useful description of a molecular electronic structure, assuming that it is based on approp…
Abstract The technique of dynamic mechanical thermal analysis (DMTA), operated in the dual cantilever mode, was used to characterize the effects of frequency, crystallinity, molecular weight (MW) and the extent of thermal oxidation on the dynamic mechanical response of poly(ethylene oxide) (PEO). The glass transition…
A new interpretation of the reflectance spectra of weathered or silica-coated soda-lime glass between 1250 and 900 cm<sup>-1</sup> is suggested. Traditionally, the presence and intensity of each spectral band observed were attributed to the concentration of a given chemical species in the film. Contributions due to th…
This report describes the results of VAMAS international round robin test for evaluating fracture toughness of ceramics. Thirteen laboratories in Japan, France, Germany, UK, Canada, Belgium and CEC (JRC Petten) took part in the test. The values of fracture toughness obtained by the SEPB, the IF and the IS methods were…