28 research outputs found
Internet Engineering Task Force (IETF)
Abstract This document considers a VPN end user establishing an IPsec Security Association (SA) with a Security Gateway using the Internet Key Exchange Protocol version 2 (IKEv2), where at least one of the peers has multiple interfaces or where Security Gateway is a cluster with each node having its own IP address
Microstructural Features and Surface Hardening of Ultrafine-Grained Ti-6Al-4V Alloy through Plasma Electrolytic Polishing and Nitrogen Ion Implantation
This work studies a near-surface layer microstructure in Ti-6Al-4V alloy samples subjected to plasma electrolytic polishing (PEP) and subsequent high-energy ion implantation with nitrogen (II). Samples with a conventional coarse-grained (CG) structure with an average α-phase size of 8 ÎŒm and an ultrafine-grained (UFG) structure (α-phase size up to 0.35 ÎŒm) produced by equal channel angular pressing were used in the studies. Features of phase composition and substructure in the thin surface layers are shown after sequential processing by PEP and II of both substrates with CG and UFG structures. Irrespective of a substrate structure, the so-called âlong-range effectâ was observed, which manifested itself in enhanced microhardness to a depth of surface layer up to 40 ÎŒm, exceeding the penetration distance of an implanted ion he. The effect of a UFG structure on depth and degree of surface hardening after PEP and ion-implantation is discussed
X-ray diffractometric analysis of the size distribution of ultradisperse particles of nickel and magnesium oxides
RĂșssia nos BRICS: visĂŁo e interpretação prĂĄtica. Semelhanças e diferenças. Coordenação dos BRICS dentro das estruturas de instituiçÔes multilaterais
Luminescence of Eu 3+ ions in hybrid polymer-inorganic composites based on poly(methyl methacrylate) and zirconia nanoparticles
Spherical nanoparticles of ZrO2 with 2 and 10 mol% EuO1.5 up to 20 nm size were prepared by the method of hydrothermal synthesis for luminescent functionalization of the polymerâinorganic nanocomposites based on poly(methyl methacrylate). Surface modification of oxide nanoparticles was carried out by 3â(trimethoxysilyl)propyl methacrylate, dimethoxymethylvinyl silane and 2âhydroxyethyl methacrylate to provide uniform distribution and to prevent agglomeration of nanosized filler in the polymer matrix. Polymerâinorganic composites were synthesized by in situ free radical polymerization in bulk. Structuring of ZrO2âEuO1.5 nanoparticles in the poly(methyl methacrylate) was studied by veryâsmallâangle neutron scattering. According to the results, the dependence of photoluminescent properties of ZrO2âEuO1.5 nanoparticles on the content of lanthanide, the symmetry of the crystal field, surface treatment and the polymer matrix were established. A correlation was shown between Stark splitting in luminescence spectra of ZrO2âEuO1.5 nanoparticles and their phase composition. Using MMTâassay it was shown that composites based on poly(methyl methacrylate) and ZrO2âEuO1.5 nanoparticles do not have cytotoxic properties, which makes it possible to use them as prosthesis materials with contrasted and luminescent imaging properties