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 consider the essential electronic excited states in parallel chains of semiconducting polymers that are currently being explored for photovoltaic and light-emitting diode applications. In particular, we focus upon various type II donor-acceptor heterojunctions and explore the relation between the exci…
The coupling constant dependence is derived in time-dependent {\em current} density functional theory. The scaling relation can be used to check approximate functionals and in conjunction with the adiabatic connection formula to obtain the ground-state energy from the exchange-correlation kernel. The result for the un…
We determine the phase diagram of liquid supercooled water by extensive computer simulations using the TIP5P-E model. We find that the transformation of water into a low density liquid in the supercooled range strongly enhances the solubility of hydrophobic particles. The transformation of water into a tetrahedrally s…
We report an experimental study of diffusion in a quasi-one-dimensional (q1D) colloid suspension which behaves like a Tonks gas. The mean squared displacement as a function of time is described well with an ansatz encompassing a time regime that is both shorter and longer than the mean time between collisions. The ans…
It is theoretically predicted that the Nernst coefficient is strongly suppressed and the thermal conductance is quantized in the quantum Hall regime of the two-dimensional electron gas. The Nernst effect is the induction of a thermomagnetic electromotive force in the $y$ direction under a temperature bias in the $x$ d…
We report results on the interrelation between driving force, roughness exponent, branching and crack speed in a finite element model. We show that for low applied loadings the crack speed reaches the values measured in the experiments, and the crack surface roughness is compatible with logarithmic scaling. At higher…
Abstract Summary: This paper aims to discuss and review developments in plasma surface modification techniques which have been seen over the past few years, with particular emphasis on low energy or soft plasma assisted surface polymerisation processes. While early work focussed mainly on protective coatings and surfa…
We have studied the crystal and magnetic structures of the magnetoelectric materials $R{\mathrm{Mn}}_{2}{\mathrm{O}}_{5}$ $(R=\mathrm{Tb},\mathrm{Ho},\mathrm{Dy})$ using neutron diffraction as a function of temperature. All three materials display incommensurate antiferromagnetic ordering below $40\phantom{\rule{0.3em…
The well-ordered aluminum oxide film formed by oxidation of the NiAl(110) surface is the most intensely studied metal surface oxide, but its structure was previously unknown. We determined the structure by extensive ab initio modeling and scanning tunneling microscopy experiments. Because the topmost aluminum atoms ar…
Self-assembly is an effective strategy for the creation of periodic structures at the nanoscale. However, because microelectronic devices use free-form design principles, the insertion point of self-assembling materials into existing nanomanufacturing processes is unclear. We directed ternary blends of diblock copolym…
The research has conducted to investigate the possibility of corn cobs utilization in particleboards production . Forty two boards were manufactured within two experiments . At the first one 18 boards produced to test the effect of two factors ; particle size ( 3 levels ) , and resin content ( 2 levels ) on the board…
Abstract Clay materials play a key role in determining the retention capacity of a soil, and are widely used in waste treatments. One of the most commonly used clays is palygorskite. The aim of this research is to determine the chemical species formed by Zn when retained in a palygorskitic clay material. Adsorption is…
Phosphate glasses were prepared by melting quenching process, and glass formation and dissolution properties were studied. The glass forming region in the K₂O-CaO-P₂O 5 system is quietly agreed with the report by Mazurin OV et al. with M₂O-M'O-P₂O 5 system (M : monovalent cation, M'divalent cation). Conditionally thes…
Se realizó un estudio taxonómico de carpóforos de macromicetes recolectados entre los meses de junio y noviembre de 2005 en áreas urbanas y semi rurales de la zona central de Chile. Este trabajo es un reporte preliminar de las especies determinadas (entre ellasSchizophyllum commune) con notas sobre algunos aspectos ec…
Structural changes were induced in a polyurethane elastomer by irradiating the film with UV light and the effects were monitored through birefringence measurements, thermal analysis and infrared spectroscopy. UV irradiation induces two competing effects: i) weakening and breaking of hydrogen bonding between the uretha…
Optical recording by smectic layer rotation is proposed and demonstrated. Smectic layer rotation is induced by the application of asymmetric voltage pulses, and the use of an amorphous silicon layer as a photoconductor allows the area for rotation to be selected by partial irradiation of the cell. The anisotropy of sm…
NiO-doped sodium metaphosphate glasses (NaPO 3 ) 1−χ (NiO) χ (0.008 ≤ χ ≤ 0.30) show a color shift from yellow to orange-brown with increasing NiO concentration. XANES and EXAFS spectra of these glasses suggest the presence of [Ni II O 6 ] groups as chromophores. EXAFS (Ni K-edge) analysis of the NiO-doped phosphate g…
In a nematic liquid crystal (LC), the excitation energy of an ultraviolet light (360 nm) is efficiently transferred to yellow fluorescent dye via blue fluorescent sensitizer, to enhance yellow fluorescence of the dichroic dye. The LC can emit white fluorescence when yellow and blue fluorescent dyes are mixed at suitab…
The tensor of the elastic stiffness constants Cij of potassium thiocyanate (KSCN) has been measured in the temperature range 290 K to 420 K, including the order-disorder phase transition at 415 K, by the ultrasonic pulse echo overlap method at frequencies f = 20 MHz. Using the measured values for Cij the isothermal el…
Abstract Porous silicon multilayer formation was observed by in situ monitoring of the reflectivity spectra in the visible range. In order to reproduce the formation process optical model simulation was carried out. For demonstration of this method a 24‐layer microcavity structure was selected. Although in this low wa…