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。
SUMMARY Hybrid buckypapers (HBP) were developed and showed potential as efficient fire‐retardant materials by implementing multiple fire retardance mechanisms. The fabrication of HBP was performed using multi‐walled carbon nanotubes (MWCNTs) and magnesium hydroxide (Mg(OH) 2 ) nanoparticles. The Mg(OH) 2 nanoparticles…
The self-assembly of a neutral meso-methoxyphenylporphyrin functionalized with a dipeptide glycilglycine substituent (MGG) in water and in water-ethanol mixtures was studied by absorption and fluorescence spectroscopy. In water, hydrophobic interactions and the noncovalent intermolecular hydrogen bonding between the t…
316L stainless steel in environments with high chlorine content suffers localised corrosion. In this study, hybrid sol–gel based anticorrosive protective coatings were developed and deposited on 316L stainless steel substrates. The effect of incorporating different compositions of silica in polymethylmethacrylate (PMM…
The soft magnetic composite material has merits of the low eddy current loss and the flexible machine design and assembly. This paper develops new brushless DC motors made of this material. The shape of the developed motor is similar to a hybrid type stepping motor, which utilizes three-dimensional isotropic ferromagn…
Abstract This study deals with the role of the different substrates on the microstructural, optical and electronical properties of TiO 2 thin films produced by conventional direct current (DC) magnetron sputtering in a mixture of pure argon and oxygen using a Ti metal target with the aid of X–ray diffractometer (XRD),…
This paper deals with the computation of hysteresis torque in electric machines by means of the hysteresis Preisach model in finite element methods. In most cases, core loss is divided into hysteresis loss and eddy current loss. However, this component experiences mostly hysteresis loss at low speed. This hysteresis l…
This paper investigates the electrical behavior of vias made by bundles of either single-walled or multiwalled carbon nanotubes (CNTs). The electronic transport in the CNTs is modeled through the kinetic inductance, the quantum capacitance, and the electrical resistance, which depend on the equivalent number of the CN…
To calculate the iron loss in an electric machine accurately, the anomalous eddy current loss generated by domain wall motion should be considered. A simple numeric modeling of anomalous eddy current loss by modifying the conductivity of steel plates is sometimes used. However, investigation on this method in detail h…
A homogenization method for analyzing eddy current fields and resultant loss in laminated ferromagnetic media is presented, where the equivalent conductivity tensor proposed in a previous paper is applied. In order to compute fields at various frequencies, the formulas for the effective skin depths along different dir…
Surface breakdown of oil-immersed solids chosen to insulate high-voltage, pulsed-power systems is a problem that can lead to catastrophic failure. Statistical analysis of the breakdown voltages, or times, associated with such liquid-solid interfaces can reveal useful information to aid system designers in the selectio…
The results of theoretical and experimental research on accelerated mass transfer involving the liquid phase in solids are analyzed. The kinetic regularities of mass transfer, the thermodynamics of grain-boundary wetting and the mechanisms of formation of liquid-channel grain boundary structure in polycrystalline mate…
A time-stepping finite element method combining analytical and numerical solutions for laminated-material homogenization is proposed to calculate 3-D magnetic leakage field and its structural parts stray losses in a 380 000 kVA/500 kV single-phase power transformer, and the high-order harmonics of field components can…
The goal of this work was to use molecular dynamics (MD) simulations to build amorphous surface layers of polypropylene (PP) and cellulose and to inspect their physical and interfacial properties. A new method to produce molecular models for these surfaces was developed, which involved the use of a "soft" confining la…
The term “swarm intelligence” is used to describe algorithms and distributed problem solvers inspired by the collective behavior of insect colonies and other animal societies. Particle swarm optimization (PSO) is a kind of swarm intelligence that is based on the social behavior metaphor. Furthermore, PSO is a stochast…
To study the reorientational motion of BH 4 groups in β and γ phases of Mg(BH 4 ) 2 and in α and β phases of Ca(BH 4 ) 2, we have performed nuclear magnetic resonance (NMR) measurements of the 1 H and 11 B spin–lattice relaxation rates in these compounds over wide ranges of temperature and resonance frequency. It is f…
The data on the preparation methods and applications of gold nanoparticles with coordinated metal ions on the surfaces are generalized. The currently available data on the interaction of metal ions with gold nanoparticles modified with organic (particularly, sulfur-containing) ligands comprising terminal chelating gro…
While Alvarez lens prototypes have recently been manufactured and tested for visible wavelengths, there is little discussion of these types of components for infrared applications in the published literature. We present and characterize a germanium Alvarez lens for infrared imaging. Mathematical analysis for determini…
An M-shaped SiC gas igniter was fabricated by a reaction sintering followed by nitrogen doping. The igniter showed both resistivity at room temperature and NTC to PTC transition temperature values that were lower than those of commercial igniters. It was deduced that the doped nitrogen reduces the electrical resistivi…
High-strength high-elastic-modulus dispersion-strengthened (DS) silver aluminum alloys are studied for sheathing Bi2Sr2CaCu2O8 + x(Bi2212) round wire. DS is an effective method for producing a fine grain metallurgical structure that is resistant to softening during high-temperature heat treatment. Here, DS Ag/0.5-wt.%…
A 4π phase modulator with an average gray-to-gray response time of ~ 400 μs is demonstrated based on sheared polymer network liquid crystal (SPNLC). This device exhibits a low scattering at 532 nm due to our new material set and shearing technique. We also discuss the application of SPNLCs for 3D display, such as lent…