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 spectral band profiles of the Ē→4A2g and 2Ā→4A2g transitions of Cr3+ in Al2O3, i.e., the commonly known ruby 6943 Å (R1) and 6929 Å (R2) emission lines, in the temperature range 10–300 K were recorded and deconvoluted numerically with excellent accuracy into a Lorentzian (homogeneous) component and a Gaussian co…
The review deals predominantly with a description of martensitic phase transitions on the basis of Landau theory, using the strain of a crystal as the order parameter and the expansion of energy in powers of the strain and its gradients. The important role of compatibility equations for strain tensor components in min…
Hydrogen (H) ingress into two copper (Cu)-nickel (Ni) alloys — a commercial 77% Cu-15% Ni alloy (aged) and alloy K-500 (UNS N05500, aged and unaged) — was studied using a technique referred to as hydrogen ingress analysis by potentiostatic pulsing (HIAPP). Anodic current transients obtained for these alloys in an acet…
Pure Ta has been cold rolled and annealed at various temperatures. The crystallographic textures were studied by measuring X-ray pole figures and subsequently calculating the orientation distribution function. The microstructure was investigated via optical microscopy. The rolling textures were explained by dislocatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIron(II)-.alpha.-Amino Acid Complexes from Nonprotic Solutions: Reactions of [Fe(Mes)2(phen)] with .alpha.-Amino Acids and the Structures of Bis(L-Prolinato)(1,10-phenanthroline)iron(II) and Bis(D-prolinato)(1,10-phenanthroline)iron(II)C. Philippe Magill, Carlo Floriani, Ang…
Abstract A number of different approaches were used to enhance the toughness of tri‐ and tetrafunctional epoxies and of unsaturated polyester resins. In the case of epoxies, tough, thermally stable, engineering thermoplastics, namely a bisphenol‐A polycarbonate and a thermoplastic poly(ether imide) (Ultem 1000) were e…
NaNiO2 exhibits a layered structure made of NiO2 slabs between which Na+ ions are inserted in octahedral environment. Trivalent nickel ions in the low spin state (t2 6e1) exhibits a Jahn-Teller effect which leads to a distortion of the NiO6 octahedra and hence to a macroscopic lattice distortion. The partial substitut…
Air-jet texturing is a versatile process for producing a range of synthetic yarns with a spun-like appearance, which are widely used for apparel and furnishing fabrics and industrial textiles. There is no universal nozzle capable of processing any supply yam of any linear density. The role played by nozzle geometry is…
Abstract The fracture mode of poly(vinyl chloride)/methyl methacrylate/butadiene/styrene (PVC/MBS) polymer blends can change from ductile to brittle in accordance with the changes in shape of the test specimen or test conditions. Therefore, the mechanisms of impact energy absorption and the main cause of stress whiten…
The coatings used on telescope mirrors and other optical interfaces can have a marked effect on an optical system's image quality. We describe the wave-front aberrations, particularly the defocus and on-axis astigmatism, that are induced by the s- and p-phase shifts of coatings. These coating-induced wave-front aberra…
The structural parameters of friction spun yams are investigated using an image processing system. Attempts are made to use data obtained from this analysis to explain differences in yam strength. In particular, the influence of production speed on yarn tenacity is paralleled by changes in the observed migrational cha…
Cavitation in a liquid is known for its deleterious effects, namely erosion, noise and loss of performance. In a mechanical heart valve, stresses generated by cavitation could lead to catastrophic failure. These deleterious effects are directly connected to the dynamics of pre-existing microscopic nuclei in the liquid…
Dielectric, elastic and piezoelectric measurement was performed on Li 2 B 4 O 7 in the temperature range from 4 K to 900 K. Superionic properties along the c -axis above 400 K were reconfirmed by dielectric measurement. Temperature dependences of the elastic compliance coefficients s 11 and s 22 , the elastic stiffnes…
Abstract A dynamic model of a seeded batch crystallizer is used to investigate the process‐dependent aspects of nucleation and growth kinetic parameter estimation by computer simulation. The satisfactory identification of all parameters in power‐law‐type kinetics with respect to supersaturation requires the use of non…
Although duplex stainless steels (SS) exhibit good performance in many severe corrosive environments, their corrosion resistance can be hampered by precipitation of chromium (Cr)- and molybdenum (Mo)-rich phases during heat treatments. The influence of aging treatments on intergranular corrosion (IGC) of a commercial…
Study of charge trapping and conduction in pure and iodine doped biaxially oriented polypropylene (BOPP) is presented. Structural and chemical modifications induced by iodine were investigated using X-ray, optical and infrared methods. Optical spectra of doped BOPP show absorption at 290 nm from charge transfer comple…
Polypropylene sheet composites were produced by both the melt consoli dation and slurry deposition processes. The resulting composites had comparable flexural properties, based on the efficiency of the glass fiber reinforcement, but dissimilar impact strengths. The impact strength of the composites was found to be rel…
The classical method of integral equations was applied to determine the electrostatic field distribution on an insulator coated with a thin homogeneous surface layer. Results of calculations of the electric potential and the electric field on both uniformly and nonuniformly polluted model insulators coated with layers…
Polymer distribution in rigid PU foams is a complex, position de pendent parameter which can be described in terms of: 1) the overall density and density distribution, 2) the average cellsize and cellsize distribution, 3) cell elonga tion and orientation and 4) the material distribution between struts and windows with…
A grain rotation model first described by Jeffery is applied to quantitatively predict texture development and texture heterogeneity in hot‐worked β‐Si 3 . Comparison of model predictions and experimental results indicates that such models can successfully priedict the texture developed in β‐Si 3 N 4 with significant…