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。
Y 2 O 3 , Er 2 O 3 and Nd 2 O 3 doped polycrystalline silicon nitride ceramics were prepared by hot press sintering method at 1850°C and 30 MPa pressure. 1 wt.% of each rare earth oxides (REO) were sintered with 3 wt.% MgO, 9 wt.% AlN and 87 wt.% α-Si 3 N 4 .The optical, mechanical and tribological properties of REO d…
In this paper we address a theoretical calculation of the electronic spectra of an Si-Ge atomic chain that is arranged in a Fibonacci quasi-periodic sequence, by using a semi-empirical quantum method based on the Hückel extended model. We apply the Fibonacci substitutional sequences in the atomic building blocks A(Si)…
Using the Otto geometry, prism coupling of microwave radiation to a metamaterial surface that supports a bound transverse-electric-polarized surface mode is demonstrated. The dispersion of this surface mode is characterized experimentally for incident radiation beyond the critical angle of the prism, and its resonant…
Reactive plasma spraying (RPS) has been considered as a promising technology for in-situ formation of aluminum nitride (AlN) thermally sprayed coatings. To fabricate thick A lN coatings in RPS process, controlling and improving the in-flight nitriding reaction of Al particles is required. In this study, it was possibl…
New ballistic protection systems based on alternative materials have been recently developed. One of the industry’s objectives is to develop lighter and stronger defensive systems, which allow higher mobility and safety for both vehicles and humans. This work studies the behavior of an aerospace protection against a p…
In this Letter, we present a new experimental approach to investigate the effective temperature concept as a generalization of the fluctuation-dissipation theorem (FDT) for nonequilibrium systems. Simultaneous measurements of diffusion coefficient and sedimentation velocity of heavy colloids, embedded in a Laponite cl…
NITE-SiC, SiC/SiC qualification of environmental resistance in various conditions is on-going toward early utilization in advanced energy and aero-space systems. Multi-layered SiC/SiC composites for preventing environmental attacks to pyrocarbon interphase was provided. Thermal exposure test in air and liquid metal(Pb…
Various types of SiC such as nanowires, thin films, foam, and continuous fibers have been developed since the early 1980s, and their applications have been expanded into several new applications, such as for gas-fueled radiation heater, diesel particulate filter (DPF), ceramic fiber separators and catalyst/catalyst su…
Highly purified preparations of thymidylate synthase, isolated from calf thymus, and L1210 parental and FdUrd-resistant cells, were found to be nitrated, as indicated by a specific reaction with anti-nitro-tyrosine antibodies, suggesting this modification to appear endogenously in normal and tumor tissues. Each human,…
In this paper, the characteristics of the nitride-based blue light-emitting diode (LED) without an electron-blocking layer (EBL) are analyzed numerically. The emission spectra, carrier concentrations in the quantum wells (QWs), energy band diagrams, electrostatic fields, and internal quantum efficiency are investigate…
Micro-optics is an indispensable key enabling technology (KET) for many applications today. The important role of micro-optical components is based on three different motivations: miniaturization, high functionality and packaging aspects. It is obvious that miniaturized systems require micro-optics for light focusing,…
Effect of high humidity on growth mechanism of a fatigue crack was investigated for an extruded bar of an age-hardened Al alloy 7075-T6 which had the marked texture of plane (111). Fracture in high humidity occurred by the growth of a shear mode crack under high stress levels, though a crack propagated in a tensile mo…
Die Aufnahme von Gold-Nanopartikeln durch Krebszellen kann über die Art der Hexapeptidliganden an der Partikeloberfläche gezielt manipuliert werden. Bereits 5 % eines Tryptophan- oder Serin-terminierten Peptids in der Ligandenmischung genügen, um eine solche Feinabstimmung herbeizuführen. Die Partikelaufnahme wird dur…
ABSTRACT The aim of this study was to describe the behaviour of a shock machine designed for testing hip prostheses. A microseparation between head and cup occurs inducing a shock of several times the body weight, leading to fracture of ceramic femoral components. Femoral heads and cups of diameter 32 mm manufactured…
We present a method for laser lithography of cell-adhesive arrays on a fluoropolymer surface. The method is based on 172 nm excimer-lamp photomodification in ammonia atmosphere followed by microstructuring by laser ablation. The improved wettability of the polymer is caused by new chemical groups on the surface after…
We report here on the fabrication of a guided-mode resonant III-nitride grating reflector on a silicon substrate. In addition to compensating the residual stress of III-nitride layers, hafnium oxide (HfO2) film also serves as a hard mask during inductively coupled plasma reactive ion etching of III-nitride layers. The…
Ceramic-Matrix Composites (CMCs) consist of a ceramic fiber architecture in a ceramic matrix, bonded together through a thin interphase. The present contribution is limited to non-oxide CMCs. Their constituents being oxidation-prone, they are protected by external coatings. We state here that CMCs display a hybrid fea…
The sensitization features in Ferritic Stainless Steel (FSS) welds are discussed in the present work. The welds were produced on a 1.5mm thick plate of 16wt%Cr FSS conforming to AISI 430 commercial grade, using TIG torch in argon environment at a heat flux between 1008W and 1584W and speed between 2.5mm/s and 3.5mm/s.…
Abstract This article presents an overview on oxygen permeation, oxidative activation of light hydrocarbons and splitting of various molecules (H2O, N2O, NOx) containing oxygen in a hollow fiber catalytic membrane reactor made of BaCoxFeyZrzO3–δ (BCFZ, x+y+z = 1) which is used to separate oxygen from oxygen containing…
Until recently, no medicinal uses were recorded for the South African Erythroxylaceae species, although, this family is used world wide in traditional medicine. This study reveals for the first time that Erythroxylum delagoense and Erythroxylum pictum roots were used to treat dysentery and diarrhoea and that Erythroxy…