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。
Iron phosphate conversion coatings are used widely in the pretreatment industry to enhance paint adherence to metal substrates and therefore improve corrosion resistance. However, very limited nonproprietary literature describing the properties of iron phosphate coating is available, as compared to volumes dedicated t…
This paper is concerned with the prediction of goniophotometric curves (distribution curves of specularly reflected light) based on our mathematical model developed earlier for single-jersey knitted fabrics made from monofilament yarns. The theory is extended to include fabrics from multifilament yarns. Four physical…
We report dielectric breakdown experiments on electric-field-structured composites of high-dielectric-constant ${\mathrm{BaTiO}}_{3}$ particles in an epoxy resin. These experiments show a significant increase in the dielectric standoff strength perpendicular to the field structuring direction, relative to control samp…
To circumvent the high computational costs of modelling each lamination to compute the eddy current distribution in three dimensions in conducting laminations, a simple method has been developed. The laminar nature of the eddy currents due to the magnetic leakage field has been considered by applying an anisotropic co…
We have studied the effect of thickness on the structural, optical and electrical properties of In2O3:Sn (ITO) thin films. Two series of ITO thin films have been deposited onto glass substrates by DC sputtering at two partial pressures of oxygen (ppo): 4 × 10−4 and 4.75 × 10−4 mbar. Each series consists of samples wit…
Low-dimensional quantum antiferromagnets are among the best systems for studying effects of quantum fluctuations within interacting systems. The best ID S=1/2 Heisenberg antiferromagnetic system is Cu(pyrazine)(NO3)2, or CuPzN, since it has excellent 1D isolation and an exchange constant (2J/kB = −10.5 K) which permit…
Using the Co and Mn L-edges x-ray-absorption spectra, Park et al. [Phys. Rev. B 55, 11 072 (1997)] claim that the charge-compensating states for Co-doped ${\mathrm{LaMnO}}_{3}$ consist of a combination of rigidly divalent Co and tetravalent Mn. Comparing their spectra to the Co L edges of ${\mathrm{Li}}_{x}{\mathrm{Co…
Abstract It is shown that the covering approach with a single decagonal prototile can be transformed into a hexagon, boat and star tiling. Particularly, the atomic decoration recently proposed by Cockayne and Widom (Phys. Rev. Lett. 81 (1998) 598–601) as a structure model for the decagonal phase is investigated. There…
Experimental-theoretical studies were carried out of the electrical and magnetic properties of the antiferromagnetic semiconductor Cr 0.5 Mn 0.5 S in the temperature range 4.2–300 K. A magnetic antiferromagnetic-ferrimagnetic phase transition was observed along with a semimetalsemiconductor electronic transition. Mont…
Different batch cooling modes (quick and slow cooling with constant cooling rate, program-med cooling with nearly constant supersaturation) of copper sulphate aqueous solutions have been studied in order to find best conditions for the investigation of the effect of additives on crystallization. Three types of additiv…
An electrical-conducting polypropylene/polypyrrole (PP/PPy) composite was prepared by the chemically oxidative modification reaction of pyrrole on the surface of PP particles in suspension. Another type of PP/PPy composite was prepared by mixing the coated PP particles with noncoated PP particles at room temperature.…
The objective of this study is to formulate a simple, rational model for estimates of the penetration depth of rigid long rods through materials susceptible to microcracking. The proposed is based on the target resistance estimated using the particle dynamic simulations. All material parameters of the model can be ide…
Abstract Montmorillonite was modified by replacing the exchangeable cations with betaines (CH 3 ) 3 N + - (CH 2 ) n - COO - M + (n = 3, 5, 7, 10) The betaine derivatives delaminated in water and formed a colloidal dispersion. Air-drying of this material yielded hard pieces which were difficult to redisperse. The dried…
Polytetrafluoroethylene powder (PTFE) was exposed to electron beam radiation in presence of air. The irradiation mainly resulted in chain scission and induction of oxygenated groups and radicals as well as unsaturation. The thermal behavior of the irradiated PTFE and the fate of the radicals were studied comprehensive…
A promising technique for the fabrication of mullite ceramics and mullite‐matrix composites with low dimensional changes (“near‐net‐shape processing”) is reaction bonding using Si metal and α‐Al 2 O 3 as starting materials, because sintering‐induced shrinkage is compensated by Si‐oxidation‐induced volume expansion. A…
Simulations have been performed at 480 K for pure melts of atactic, isotactic and syndiotactic polypropylene chains with a degree of polymerization of 50 and composition C150H302, and also for the three 50:50 mixtures of two of these species. The simulations are performed on a high coordination lattice, with incorpora…
Two dynamical thermokinetic systems for simultaneous reaction models of polymer decomposition are compared. In the independent-parallel model, the common reactant is divided explicitly between the reactions, and in the competitive model the entire reactant mass is available to both reactions. Elementary bifurcation an…
Cet article fait le point sur les connaissances concernant l'implication des bactéries sulfurogènes dans la corrosion des aciers au carbone. Après la description de quelques cas récents tirés de l'industrie pétrolière, la physiologie des bactéries sulfurogènes qui jouent le rôle principal dans le mécanisme de la corro…
The fatigue of copper single crystals, orientated for single slip, has been studied using electron channelling contrast imaging in a scanning electron microscope. With the incident beam set at the Bragg condition, changes in the backscattered electron intensity occur as the beam is scanned over dislocations that cause…
Abstract For 40 years the copper polysilicate Cu[SiO 3 ], isotypic with the germanate prototype Cu[GeO 3 ], was considered non-existent. Recently however we discovered this compound as a metastable decomposition product of the silicate mineral dioptase, Cu 6 [Si 6 O 18 ] · 6 H 2 O. Its orthorhombic unit-cell was refin…