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 etching characteristics of CVD (chemical vapour deposition) diamond films processed with an ECR (electron cyclotron resonance) oxygen plasma are investigated. The etching rate increases linearly with increasing microwave power in the range from 100 to 300 W. For any value of microwave power, the etching rate first…
In this work, we have studied bismuth telluride (Bi2Te3) thin films on Si(100) and SiO2/Si(100) substrates grown by Hot Wall Epitaxy (HWE) technique. The morphology of the surface was controlled by Atomic Force Microscopy (AFM). Reflection and transmission experiments in the mid-infrared (MIR) spectral range were perf…
Surface phonons, electronic structure and chemical reactivity of the diamond (100)(2 ×1) surface have been studied using electron energy loss spectroscopy (EELS), thermal desorption spectroscopy (TDS) and low-energy electron diffraction (LEED). Vibrational losses are observed at ∼80, 92, 123, 135, 147 and 165 meV for…
A constitutive law to model the strain-rate-dependent compression behavior of concrete is proposed. It is derived from a mechanical model, where inertia effects influence damage formation. To verify this model an experimental method based on the split Hopkinson bar (SHB) technique is described, one that considers the…
The compounds tetrakis(trimethylsilyl)methane C[Si(CH(3))(3)](4) (TC) and tetrakis(trimethylsilyl)silane Si[Si(CH(3))(3)](4) (TSi) have crystal structures with the molecules in a cubic closed-packed (c.c.p.) stacking. At room temperature both structures have space group Fm{\bar 3}m (Z = 4) with a = 13.5218 (1) Å, V =…
The electrochemical behavior of a soluble polyimide (Tani-polyimide) derived from an aniline trimer was investigated. Similar to processes observed in polyaniline, two typical redox processes involving protonation and ion insertion were observed. Due to the presence of an isolated, short quinonediimine or N,N′-dipheny…
The structure of monodisperse and bimodal brushes consisting of poly(ethylene oxide) (PEO) at the air/water interface is investigated with neutron reflectivity, and the results are compared with the structure predicted by the Scheutjens−Fleer self-consistent-field lattice model. The monomer density profile of a monodi…
Abstract The thermal behavior of blends of nylon 6,6, with an amorphous polyamide, Trogamid‐T, and a semicrystalline polyamide, nylon 6,12, was studied. The blends were prepared both by solution blending and by melt blending, using a Maxwell extruder and a twin screw extruder. The concentration of the blends ranged fr…
A new structure is proposed to improve the external quantum efficiency of porous silicon (PS) light emitting diodes (LED). It is based on a heterojunction between n-type doped silicon and PS. The heterojunction is formed due to the doping selectivity of the etching process used to form PS. The improvement of the propo…
An ab initio linear augmented-plane-wave (LAPW) calculation of the zone-center phonon frequencies of SnO has been performed. ${E}_{g}$ symmetry has been ascribed to the mode observed at $113 {\mathrm{cm}}^{\ensuremath{-}1}$ in Raman measurements, discarding a previous ${B}_{1g}$ assignment. The other phonon modes meas…
A group of magnesia‐graphite and magnesia‐graphite‐aluminum materials, the compositions of which represent a wide range of graphite contents (~10‐16.4 wt%), aluminum contents (0‐5.2 wt%), and MgO and graphite qualities, were fabricated, using standard commercial practices. Chemical analysis and determination of room‐t…
We have designed and built a static tester around a commercially available polarized light microscope. This device employs two semiconductor laser diodes (at 643- and 680-nm wavelengths) for the purpose of recording small marks on various media for optical data storage and for the simultaneous monitoring of the record…
α- und β-BaCu2S2, wie auch die entsprechenden isotypen Selenide, wurden bei 480 °C in einer Kaliumthio- beziehungsweise Kaliumselenocyanatschmelze als Kristalle erhalten. Die Darstellung des goldgelben α-BaCu2S2 war bisher in reiner Form nicht gelungen [1]. Einkristallstrukturuntersuchungen von allen vier Substanzen b…
1. Eggshell pieces (1 cm2) were decalcified using a solution of EDTA (200 g/litre, pH 6.9 to 7.0) in paraformaldehyde (2 g/litre) and glutaraldehyde (0.5 g/litre) in phosphate buffer. 2. They were prepared for transmission electron microscopy (TEM). 3. TEM identified a vertically aligned matrix associated with the ver…
Abstract Triple-decker sandwich complexes, which consist of two cerium ions and three strip-like diarylporphyrins, have been synthesized and their spectroscopic and electrochemical properties and mesomorphism are reported and compared with those of the corresponding double deckers and the parent monomers. The Soret ba…
Acinetobacter baumannii BL54, a silver (Ag) resistant micro-organism was isolated from clinical samples collected at the Armed Forces Medical College hospital in Pune, India. The strain BL54 removed a high quantity of silver (2.85 mg/g biomass) from photographic wastewater effluent. Treatment of the cells with 10 mM E…
Abstract Adsorption and the mechanism of adsorption of the herbicide glyphosate [N-(phosphonomethyl) glycine] by hydrotalcite (HT) and by hydrotalcite calcined at 500°C (HT500) was studied. The values of the Freundlich K constant of the adsorption isotherms and the distribution coefficients, Kd, depend on the pH of th…
The thermal expansion of the orthorhombic \ensuremath{\gamma} phase of ${\mathrm{ZrW}}_{2}{\mathrm{O}}_{8}$ has been measured using neutron powder diffraction from 4.6 to 410 K, where it transforms to the cubic \ensuremath{\alpha} phase. At low temperature, $\ensuremath{\gamma}{\ensuremath{-}\mathrm{Z}\mathrm{r}\mathr…
We give a detailed analysis of the scanning electron microscope mirror method for studying a cloud of charge stored near the surface of an insulator, paying particular attention to the approximations that are often made. We discuss the effect of the finite size of the experimental chamber, of the thickness of the samp…
The application of peptide recognition sequences of elastase to fibers of wound dressings is a possible route to inhibiting high levels of destructive elastase in the chronic wound. For this reason we have synthesized the elastase recognition sequence Val-Pro-Val on both cotton cellulose, and carboxymethylated cellulo…