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。
This article describes particulate fouling experiments performed on small-scale and full-scale plate heat exchangers for three different corrugation angles (30 deg, 45 deg and 60 deg). The velocity effect has been studied as well as the particle type and concentration effects. The test duration ranges between 20 and 1…
Effect of the chiral dopants molecular structure on the kind of the temperature dependencies of the induced cholesteric helical pitch has been studied for LC systems on the base of 4-pentyl-4′-cyanobiphenyl or 4-methoxybenzylidene-4-butylaniline including chiral S,α-phe-nylethylamine and E-1R,4R-2-(4-phenylbenzylidene…
Results obtained by the indirect zonal isotropic uniform random (IUR) estimation were compared with those obtained by the direct point and interception counting methods on vertical (VS) or IUR sections in a stereological study of bovine articular cartilage collagen fibrils at the ultrastructural level. Besides compari…
The physical aging behavior of an isotropic amorphous polyimide possessing a glass transition temperature of approximately 239°C was investigated for aging temperatures ranging from 174 to 224°C. Enthalpy recovery was evaluated as a function of aging time following sub-Tg annealing in order to assess enthalpy relaxati…
On reaction with organolithium compounds, N-substituted metalloporphyrins gave mixtures of mono-β-alkylated chlorins and hydroxychlorins, whereas free-base porphyrins give meso- + β- mono- and dialkylated products. Reduction of N-substituted porphyrins with tosylhydrazine or sodium tetrahydroborate opened new routes t…
In a prospective cladding material for the long-life core of the Liquid Metal Fast Reactor, our efforts are taken into the oxide dispersion strengthened (ODS) ferritic steels, which have more swelling resistance than austenitic steels and are expected to have superior creep strength at elevated temperature of 973 K.It…
Using finite difference calculations in continuum equations and using deterministic kinetic equations for calculations in a discrete lattice, the problem of the asymmetry, related to the strong concentration dependence of the diffusion coefficient in the diffusional mixing of binary multilayers, was investigated assum…
Previous studies have reported the existence of a green photoluminescence (PL) band in oxygen-deficient silica glass when exposed to ultraviolet (UV) light. Oxygen deficient defects (Eδ′) were thought to be the origin of this PL band. In this article, we describe the characteristics of a green PL band in oxygen-surplu…
Crystals of triglycine sulphate (TGS) doped with orthonitroaniline (ONA) irradiated with different doses of gamma-radiation were used to investigate gamma-radiation effect on electrical and optical parameters. The absorption coefficient and the reflectance were measured and hence the extinction coefficient, the optica…
The electrical behavior of commercial ZnO varistor devices has been examined with voltage contrast microscopy and point contact dc electrical measurements. Nonlinear voltage‐dependent behavior has been observed across both of the major crystalline boundary types present in the system: Bi 2 O 3 layer containing ZnO gra…
Three novel quaternary selenoarsenates could be synthesized by the solventothermal reaction of [AsSe 3 ] 3 - anions with AgBF 4 in the presence of the respective alkali metal cation. Orange crystals of K 3 AgAs 2 Se 5 ·0.25MeOH ( I ) are formed after reaction in MeOH at 130 °C for ∼2 h. Its structure is built up of ψ-…
Abstract The title compound, a new terphenoquinone derivative, shows a dynamic redox behavior upon cyclic voltammetry and a reversible, photochemical-thermal isomerization between the quinone and diradical forms, both phenomena involving restricted conformational change.
This work studies the ternary Si-C-N phases ${\mathrm{SiC}}_{2}{\mathrm{N}}_{4}$ and ${\mathrm{Si}}_{2}{\mathrm{CN}}_{4},$exploiting an analogy between the NCN and O groups. Starting from the molecular model of ${N,N}^{\ensuremath{'}}\ensuremath{-}\mathrm{bis}(\mathrm{trimethylsilyl})\ensuremath{-}\mathrm{carbodiimide…
Poly(3-hydroxyalkanoate)-g-poly(ethylene glycol) crosslinked graft copolymers are described. Poly(3-hydroxyalkanoate)s containing double bonds in the side chain (PHA-DB) were obtained by co-feeding Pseudomonas oleovorans with a mixture of nonanoic acid and anchovy (hamci) oily acid (in weight ratios of 50/50 and 70/30…
Serendipity has been a major player in most dye discoveries, and phthalocyanines are no exception. The true account of their discovery in 1928 is given using information provided by one of the individuals involved (Ron Greig). One of the inventors, Drescher, after making a key observation as to the nature of the insol…
It has been shown before by (31)P NMR that Ras bound to the nonhydrolyzable GTP analogue guanosine 5'-O-(beta, gamma-imidotriphosphate) (GppNHp) exists in two conformations which are rapidly interconverting with a rate constant of 3200 s-1 at 30 degrees C [Geyer, M., et al. (1996) Biochemistry 35, 10308-10320]. Here w…
Abstract Mechanisms by which organic bases are adsorbed on hydrated smectite surfaces were investigated. Three Ca-saturated reference smectites (Otay, SPV, and Panther Creek) were dispersed in distilled water containing 5 μmol of pyridine or 3-butylpyridine. The pH was adjusted to between 7.5 and 3 using 0.01 M HCl. A…
Infrared spectroscopy is used to investigate the electronic structure and charge carrier relaxation in crystalline films of ${\mathrm{CrO}}_{2}$ which is the simplest of all half-metallic ferromagnets. Chromium dioxide is a bad metal at room temperature but it has a remarkably low residual resistivity $(<5 \ensurem…
Abstract Some A 2 + B 3 and A 3 + B 3 reagent pairs have been used for the direct polyamidation reaction leading, besides the network formation, to hyperbranched aramid structures. Depending on the chosen experimental conditions, variable amounts of a sol fraction having close similarities with the hyperbranched arami…
As type IX collagen is a minor cartilage component, it is difficult to purify sufficient amounts of it from tissues or cultured cells to study its structure and function. Also, the conventional pepsin digestion used for fibrillar collagens cannot be utilized for purifying type IX collagen, because it contains several…