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。
In this paper we report about investigations on coupled electrochemomechanical phenomena in polypyrrole (PPy) free-standing films. Quantitative measurements of isotonic length and relaxed elastic modulus changes are performed on PPy samples during cyclic voltammetry and square-wave amperometry. The link between dimens…
The machinability of a heterogeneous silicon carbide with weak interphase boundaries, elongated grains, and high internal stresses is evaluated relative to a homogeneous control material with a well‐bonded, equiaxed, and unstressed grain structure. Drilling and grinding rates for the silicon carbide are substantially…
This work presents further results on the use of fractal features for recognition of 3-D partial discharge patterns. Two fractal features, the fractal dimension and lacunarity were calculated from 3-D discharge patterns and their power to discriminate among various discharge patterns was analyzed. The results indicate…
In this paper one-dimensional Cahn–Morral systems, which are the multicomponent analogues of the Cahn–Hilliard model for phase separation and coarsening in binary mixtures, are studied. In particular, there is an examination of solutions that start with initial data close to the preferred phases except at finitely man…
The synthesis of mesogenic triphenylene-based porphyrazine complexes bearing sixteen decyloxy side-chains is described; the widely extended core-system present leads to an enhanced stability of the mesophases formed by these complexes.
Abstract The common formalism of quantitative XPS can be easily modified, with two additional correction factors β eff and Q x , to account for the elastic scattering effects. These corrections, for a given solid, depend on photolectron line, the radiation used and the XPS configuration. The database compiled in the p…
Abstract Expressions for the kinetics of grafting chains from a pure end‐functional polymer melt to a reactive interface are derived under the assumption that the free energy of reaction is very large and negative. Two cases are considered: a case where the grafting is controlled by diffusion of free end‐functional ch…
An insoluble catalytic assembly consisting of a silicate xerogel covalently modified with phenyl groups and quaternary ammonium–polyoxometalate ion pairs was used to catalyse the oxidation of alkenes with 30% aqueous hydrogen peroxide in the absence of an organic solvent.
Journal URL: http://www.societyofglasstechnology.org.uk/cgi-bin/open.cgi?page=%20PC/PC-00a&sessionid=85597106; http://www.societyofglasstechnology.org.uk/cgi-bin/open.cgi?page=journal&sessionid=85597106
Treatment of [Mr4O2(OAc)6(py)2(dbm)2]1(py = pyridine, Hdbm = dibenzoylmethane) in hot MeCN with Me3SiX (X = N3–, OCN –) yields [Mn4O3X(OAc)3(dbm)3] containing extremely rare η1, µ3-N3– or -OCN– groups; alternating-current magnetic susceptibility studies reveal unusual magnetic relaxation effects and indicate these spe…
The segmental bidentate–tridentate ligand L2 reacts with LnIII and ZnII in acetonitrile to give the first self-assembled heterodinuclear d–f triple-helical complexes [LnZn(L2)3]5+(Ln = La, Eu), as determined from solution-phase studies.
Abstract This article describes the results of laboratory batch solubility experiments with five chlorinated solvents (chloroform, carbon tetrachloride, 1,1,1-trichloroethane, trichloroethylene, and tetrachloroethylene) present alone or in binary or ternary mixtures. The measured aqueous solubility values of the pure…
The synthesis of mesoporous tin-silicates analogous to MCM-41 is reported, for which characterization studies indicate the incorporation of tin in the framework; the Sn-MCM-41 samples have excellent catalytic properties in the selective oxidation of aromatics and hydroxylation of phenol and 1-naphthol with peroxides.
Various aerobic Gram-negative bacteria have been examined for their ability to use 4-hydroxybutyrate and 1,4-butanediol as carbon source for growth. Alcaligenes eutrophus strains H16, HF39, PHB-4 and Pseudomonas denitrificans 'Morris' were not able to grow with 1,4-butanediol or 4-hydroxybutyrate. From A. eutrophus HF…
A new siliceous porous material of high BET surface area is derived from an intercalation of octylamine and tetraethylorthosilicate into the layered silicic acid of ilerite; the resultant pillared material has a BET surface area of over 1000 m2 g–1 at 600 °C and 580 m2 g–1 even at 900 °C.
Polymers deteriorate by a number of mechanisms. In the lifetime of a polymer, deterioration may proceed gradually or rapidly. During processing, a polymer is melted and formed to a desired shape; it undergoes some deterioration due to the extreme temperature and mechanical stress. For example, polymer chains may ruptu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTXANES Spectroscopic Studies of Evaporated Porphyrin Films: Molecular Orientation and Electronic StructureS. Narioka, H. Ishii, Y. Ouchi, T. Yokoyama, T. Ohta, and K. SekiCite this: J. Phys. Chem. 1995, 99, 4, 1332–1337Publication Date (Print):January 1, 1995Publication Histo…
The Cretaceous record of the diatoms presented here outlines our understanding of their early morphological development. Recent documentation of well preserved Lower Cretaceous (Aptian/Albian) diatom assemblages provides a window into the early history of the diatoms and serves as a base for comparing their subsequent…
Abstract
A new method is presented of partial discharge data analysis for the investigation of space charge and degradation phenomena in high-voltage insulation systems. The basic principles of the pulse-sequence-analysis (PSA) are illustrated and the characteristic differences with regard to standard procedures that have been…