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。
Quantitative prediction models for the corrosion of cathodically protected line pipe steel under a disbonded coating were presented. The optimization plot for the cathodic protection (CP) of crevices beneath a disbonded sleeve applied at the girth weld joint was presented using the multiple quadratic regression analys…
A novel, colourless, water soluble, anionic cross‐linking agent, 2,4‐diacrylamidobenzenesulphonic acid, has been synthesised, applied to lyocell by a pad–steam method and the wet abrasion resistance measured. The agent furnished cross‐linked lyocell fibres with good wet abrasion resistance and stable lyocell–agent bon…
The composition-temperature-pressure phase diagram of pyrope-grossular solid solutions, in which Mg and Ca are guest species in a highly rigid aluminosilicate framework, is predicted using simple models for the mixing enthalpy and the vibrational excitations. The models are expected to elucidate general phase separati…
During the last three decades, several techniques have been proposed for signal-to-noise ratio (SNR) and noise variance estimation in images, with different degrees of success. Recently, a novel technique based on the statistical autoregressive model (AR) was developed and proposed as a solution to SNR estimation in s…
The luminescence properties of a Pr3+-doped gadolinium gallium garnet (GGG, Gd3Ga5O12) nanocrystalline host were investigated. Dominant blue/green emission was observed emanating from the 3P0 --> 3H4 transition after excitation using a wavelength of 457.9 nm. Continuous wave excitation into the 1D2 level of the Pr3+ i…
The resistance fluctuation properties of a family of conducting polymer blends, poly(aniline)/poly(methyl methacrylate), are investigated as a function of conducting phase mass fraction. The blends exhibit $1∕f$ noise according to Hooge's empirical formula. The noise amplitude scales with the conducting phase mass fra…
Abstract Polyimide/silica hybrids were prepared by a sol‐gel process and were evaluated in terms of curing behaviour, morphology and mechanical properties. The spectroscopic examination showed that the presence of the inorganic phase accelerates the imidization of the polyamic acid. Two types of morphology for the sil…
The taxonomie position of Cyclotella andina Theriot, Carney et Richerson, a tropical freshwater planktonic diatom originally identified from Lake Titicaca, is modified based on morphological characters. The presence of striae arranged in discrete fascicles on the valve- face, coupled with the placing of fiilto- and ri…
Calorimetry, conductivity, IR and Raman studies of the two ionic-protonic conductors Rb2SeO4·Te(OH)6 (RbSeTe) and Rb1.12(NH4)0.88SO4·Te(OH)6 (RNST) have been recorded and analyzed. These compounds crystallize in the monoclinic system, the space groups being, respectively, P21/c and P21/a for (RbSeTe) and (RNST) with f…
Abstract Graft copolymer of glycidyl methacrylate and styrene onto natural rubber latex was synthesized by emulsion polymerization using cumene hydroperoxide and tetraethylene pentamine as a redox initiator. The effects of initiator and monomer concentration, reaction temperature and time on grafting efficiency and mo…
Optical second harmonic generation (SHG) has been measured for plasma-deposited thin films of hydrogenated amorphous silicon (a-Si:H) at different polarization states for pump photon energies between 1.0 and 1.7eV. Distinct resonance peaks are observed in this energy range and it is shown that the SH signal originates…
Thin diamond membranes and free-standing sheets are of interest for a variety of potential applications. This article describes the film nucleation, microwave plasma-assisted chemical-vapor-deposition synthesis, and subsequent processing steps required to make free-standing strong and flexible diamond foils of several…
It is expected that a protein depletion zone and an impurity depletion zone are formed around a crystal during protein crystal growth if the diffusion field around the crystal is not disturbed. The growth rate of the crystal may be decreased and the impurity uptake may be suppressed to result in highly ordered crystal…
We studied the structure of interfaces in layered ferroclectrics comprising two different ferroelectric materials with first and/or second order transitions. The layered structure is described using the Landau-Ginzburg theory by including a bilinear coupling at the interface between the two neighboring layers. The int…
A multitechnique investigation of the determination of the order of magnitude of the second and third order NLO response of [5-[(4-dimethylaminophenyl)ethynyl]-15-[(4-nitrophenyl)ethynyl]-10,20-diphenylporphyrinato]nickel(II) (1) is reported with the aim to produce self consistent evidence for a significant NLO respon…
Oxidations of a trigonal-bipyramidal, high-spin Ni(II) dithiolate complex of a pentadentate, N3S2-donor ligand, N1,N9-bis(imino-2-mercaptopropane)-1,5,9-triazanonane) nickel(II), and the structurally analogous Zn(II) complex, lead to oxidations of the ligand. Oxidation of the Ni(II) complex with I2 produces a novel Ni…
We report a low temperature procedure for the fabrication of highly luminescent silicon nanoparticles in silicon-rich oxide films. A number density over 1012∕cm2 has been achieved for silicon particles of about 3nm in size by plasma-enhanced chemical vapor deposition at a substrate temperature of 30°C. Such deposits,…
Temperature-induced reversible unfolding and refolding of the three-stranded alpha-helical coiled coil, Lpp-56, were studied by kinetic and thermodynamic methods, using CD spectroscopy, dynamic light scattering, and scanning calorimetry. It was found that both unfolding and refolding reactions of this protein in neutr…
One of the challenges in characterization of strain-induced transformations is to create uniform pressure. In this letter, conditions for nearly homogeneous pressure distribution are predicted and achieved experimentally. Compared to hydrostatic loading, plastic shear generally reduces the transformation pressure sign…
1,9-Diacyldipyrromethanes are important precursors to porphyrins, yet synthetic access remains limited owing to (1) poor conversion in the 9-acylation of 1-acyldipyrromethanes and (2) handling difficulties because acyldipyrromethanes typically streak upon chromatography and give amorphous powders upon attempted crysta…