Materials Literature
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Biosilicification in diatoms1 and sponges2 potentially pro-mises physiological, mild reaction conditions for controlling silica structures at the nanometer scale. Since Sumper et al. had isolated catalytic peptides (i.e., silaffins) from diatoms,3 a number of polymers bearing tertiary amine or ammonium groups have bee…
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Al(OH) 3 thin films were assembled on anionic polysulfonamide (PSA) fabrics by electrostatic self-assembly method to improve the mechanical, heat insulation, and flame retardant properties of PSA fabrics. PSA fabric surface was modified with a chemical reaction to build-up anionic charge known as anionization. Then a…
A pair of covalently linked molecular dyads is described in which two disparate boron dipyrromethene dyes are separated by a tolane-like spacer. Efficient electronic energy transfer (EET) occurs across the dyad; the mechanism involves important contributions from both Förster-type coulombic interactions and Dexter-typ…
The effect of an arc energy absorber installed in a wind turbine switch unit has been investigated by computational fluid dynamics simulations based on results of an internal arc test. The absorber is assembled from several layers of perforated plates. The compact switch unit consists of an SF6insulated switch tank, a…
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Primary and secondary wear in soft-ground tunneling using various types of shields has a major impact on machine operation, utilization, and tunneling costs. Wear occurs due to interaction between abrasive soils and cutters, as well as other components of the machine which come into contact with the muck. However, the…
We have studied$\hbox{Bi}_{2}\hbox{Sr}_{2}\hbox{CaCu}_{2}\hbox{O}_{8 + \delta}$(Bi-2212) thin films fabrication by a metal organic decomposition method. When the Bi-2212 thin films were prepared on c-cut sapphire substrates, the maximum critical temperature$(T_{\rm C})$was 25 K by 820$^{\circ}\hbox{C}$air annealing in…
To investigate the electrical instability mechanism under the application of gate bias stress and relaxation, the 1/f noise spectra of two different ZnO thin-film transistors (TFTs) were analyzed. In terms of gate bias dependence (S IDS/I DS), both devices followed a mobility fluctuation model based on the traps in th…
Cynanchum paniculatum (Bunge) Kitag.(Asclepiadaceae) grows in areas of Asia, such as China and Korea, and has been used in Chinese traditional medicine for treating snake bites and chronic bronchitis. 1 The root of this plant has been used as a diuretic in Korean folk medicine.2 Steroidal glycosides 3 and phenolic com…
The stress–strain behaviour of polypropylene fibres is evaluated for various tensile strain rates. Fibre samples are extracted from a thermally bonded nonwoven and fixed in a low-load tensile test machine. A methodology is introduced to implement a constant true strain rate at high strain tests for conventional tensil…
Carbon nanofiber aerogels can be fabricated on a large scale by using a low-cost biomass, bacterial cellulose, as a precursor, which can be produced industrially in a microbial fermentation process (see picture). As described by S. H. Yu and co-workers in their Communication on page 2925 ff., the aerogels are ultralig…
This chapter contains sections titled: Introduction Experimental Result and discussion Conclusions
In this paper, a novel model is proposed to predict stress behavior in the fibrous polymer composites under an applied tensile axial loading. Tangential stress is obtained by simulating between polymeric matrix flow (polyester) and fluid flow. In the other words, creep behavior of the petrochemical material or polymer…
采用光学浮区定向凝固炉,对Ti-43Al-3Si合金进行引晶定向生长研究.从直径70 mm铸棒中切取直径9 mm多晶棒为籽晶,在5 mm/h的速度下引晶生长出了微观片层平行于生长方向的定向合金.采用OM对获得试样的组织进行观察,结果表明,在开始凝固的L+α+β三相共存区中,多晶棒有效引晶并控制了心部α相,并在曲面生长条件下逐渐发展成为占据主导地位的组织结构.对实验中多晶籽晶的选取、三相共存及曲面生长原理进行了深入讨论.
To use mesoporous silicas as low-k materials, the pore entrances must be really small to avoid diffusion of metals that can increase the dielectric constant of the low-k dielectric. In this paper we present a new method to narrow the pores of mesoporous materials through grafting of a cyclic-bridged organosilane precu…
In Brief In this study, the construct validity of the moisture subscale of the Braden Scale for Predicting Pressure Sore Risk is partially supported by the significant inverse relationships between moisture subscale scores, the number of wet observations and soiled observations, brief changes, and differences among th…
Crystallization, commonly defined as a process of formation of a crystalline solid from a supersaturated solution, melt or vapor phase, is an old technique widely used in laboratory and in industrial processes to separate and purify substances. In various modern industries, crystalline forms with a certain habit, size…
Nanoparticles are a class of materials that have seen increasing use as friction and wear reducers in tribological applications. Amorphous carbon (a-C) films have been the subject of significant scientific and industrial interest for use as solid-state lubricants. Here, we present classical molecular dynamics simulati…
Abstract Thermal expansion of differently‐textured pyrolytic carbon matrices (pyrocarbons) of carbon/carbon composites was studied with a high temperature X‐ray diffraction at temperatures ranging from 25°C to 1400°C. The composites were synthesized by chemical vapor infiltration of a carbon fiber felt, using methane…