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 calculation of the IR absorbance of a powdered crystalline, ionic material, diluted in an appropriate IR-transparent matrix in a known proportion, is in principle possible, provided that the size and shape distributions of the particles, as well as the optical parameters of the bulk material, and those of the matr…
This book will be invaluable to anyone who is interested in understanding the physics of thermoluminescence (TL). Intended for use by TL dosimetrists, research workers and students, it includes information on glow curves, emission spectra, the mechanisms of TL production, trapping parameters associated with TL signals…
Various concentrations of molybdate (MoO42−) were added to the protein-containing and deproteinated exopolymers of the marine bacterium Deleya marina. Interaction was investigated using x-ray photoelectron spectroscopy (XPS) and electron spin resonance (ESR). MoO42− reduction was observed exclusively in the deaerated…
Abstract Chain transfer can be performed effectively by a mechanism of addition‐fragmentation with appropriately substituted allylic compounds, vinyl ethers and thionoesters. Selection of substituents allows the optimization of chain transfer activity and the preparation of macromonomers and other end‐functional polym…
The effect of substitutional disorder in a Fibonacci chain is studied. In particular it is shown that the presence of a single impurity affects all the states of the unperturbed system, reducing the fractal dimension of the spectrum. Resonant eigenstates are also observed. The consequences of the instability of the sp…
Conflicting information is available on the propensity different soil clays exhibit to dispersion. We therefore assessed the relative stability of the clay components of 12 soil samples, from various parts of South Africa, to predominantly physical disruption by a mild disruptive treatment [mechanical shaking for 5 mi…
Abstract Fine clays (<0.1 μm) extracted from an acid soil developed in a granite saprolite from the Massif Central, France, were characterized by X-ray diffraction (XRD) using a curve decomposition program, and high-resolution transmission electron microscopy (HRTEM) associated with a method of impregnation of mois…
Abstract The influence of temperature and type of initiator on the grafting efficiency of maleic anhydride onto isotactic poly(propylene) powder under solid‐state reaction conditions was investigated. The level of bonded maleic anhydride was found to be about 20% higher using aliphatic peroxide, such as lauroyl peroxi…
This paper presents the results of a study investigating the energy performance of three newly developed prototype electrochromic devices. The DOE-2.1 E energy simulation program was used to analyze the annual cooling, lighting, and total electric energy use and peak demand as a function of window type and size. The a…
Based on recent experimental results, a molecular model of the ferroelectric ordering in the induced smectic-${C}^{*}$ phase is proposed in terms of a coupling between dipole and quadrupole ordering of chiral molecules. The analysis of the correlations between the value and sign of the spontaneous polarization and the…
Relationships between abiotic oxidation and adsorption of phenolic acids added to soils and soil chemical properties were investigated by using 32 soil samples and ferulic, vanillic, and p-hydroxybenzoic acids. Soil properties studied were as follows: (as adsorption factors) contents of acid oxalate extractable Al (Al…
Wide-angle X-ray diffraction measurements were performed on polymer melts of isotactic and syndiotactic polypropylene (IPP and SPP), poly(ethylenepropylene) (PEP), polystyrene (PS), polyisobutylene (PIB), and polyethylene (PE), to study the dependence of the short-range structure of polymer liquids on chain architectu…
Other| December 01, 1996 Displacive phase transition in anorthoclase; the “plateau effect” and the effect of T1-T2 ordering on the transition temperature Stuart A. Hayward; Stuart A. Hayward University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom Search for other works by this author on: GSW G…
A mean-field theory of inhomogeneous polymer systems is developed in order to include the finite molecular weight effects. A general analytical expression for the conformational free energy providing a bridge between strong and weak segregation limits is derived. The general results are further employed to obtain the…
Templates for the arrangement of guest molecules—that is the role played by microporous crystalline SiO2 modifications in the insertion compounds presented. The electronic interactions between the guest species can be controlled by the dimensionalities of the void systems. When iodine is the guest component, this is d…
A high damping capacity is considered as one of the important functional properties of shape memory alloys. Those properties are related to a thermoelastic martensitic transformation. As a consequence of this transformation, the internal friction or damping can be investigated for three different states : 1. during th…
Abstract Ce/Al- and La/Al-pillared smectites were prepared by cation exchange of bentonite, saponite and laponite with hydrothermally treated (130–160 °C for 16–136 h) solutions containing mixtures of aluminumchlorohydrate (ACH) and Ce 3+ -/and La 3+ -salts. After calcination at 500 °C, the pillared products are chara…
The synthesis of some water-insoluble synthetic polyelectrolyte complexes formed between a weak polyanion and a strong polycation was followed. Sodium salts of poly(acrylic acid) and of some copolymers of acrylic acid with itaconic acid or maleic acid were used as anionic polymers. Cationic polyelectrolytes with quate…
We study the phenomena associated with the low-velocity impact of two solid discs of equal size using a cell model of brittle solids. The fragment ejection exhibits a jet-like structure the direction of which depends on the impact parameter. We obtain the velocity and the mass distribution of the debris. Varying the r…
This paper deals with optimization of a class of linear dynamic systems with n states and m control inputs, commanded to move between two fixed states in a prescribed final time. This problem is solved conventionally using Lagrange’s multipliers and it is well known that the optimal solution satisfies 2n first-order l…