Materials Literature
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A linear zone plate named multilayer laue lens (MLL) is fabricated using a depth-graded multilayer structure.The lens shows considerable potential in focusing an X-ray beam into a nanometer scale with high efficiency.In this letter, a depth-graded multilayer consisting of 324 alternating WSi2 and Si layers with a tota…
The vibrational spectrum of hydrogen and the parameters of H jump motion in the rhombohedral Th(2)Zn(17)-type compound Ce(2)Fe(17)H(5) have been studied by means of inelastic and quasielastic neutron scattering. It is found that hydrogen atoms occupying interstitial Ce(2)Fe(2) sites participate in the fast localized j…
The single-UV-photon (227–243 nm) dissociation of ${\rm CS}_2^ + (\tilde X{}^2\Pi _{g,3/2,1/2})$ CS 2+(X̃2Πg,3/2,1/2) into the S+(4S)CS(X1)Σ+ channel was investigated by means of time-sliced velocity map imaging technique. In the high-energy region of the $\tilde B{}^2\Sigma _u^ +$B̃2Σu+ state, a rather subtle photodi…
Cryogenic tensile and fracture properties of carbon nanofiber (CNF)/poly-dicyclopentadiene (poly-DCPD) composites have been investigated experimentally. Flat tensile specimens and single-edge notched tensile (SENT) specimens of CNF/poly-DCPD composites with 0.25, 0.5, and 1.0 vol% CNFs were fabricated by an ultrasonic…
This work focuses on the fatigue behaviour of notched Ti-6Al-4V titanium alloy in inert environment. V-notched flat samples were cycled under axial fatigue (R = 0.1) under inert conditions by immersion in paraffin oil. A step-loading technique was used to determine the fatigue limit at the complete fracture for a cons…
This paper deals with calculation procedure for lifetime determination of a large three-row roller slewing bearing. First, the contact force distribution between the rollers and the bearing raceway is determined both analytically and numerically. Then, the position and the magnitude of the maximum contact force are id…
In recent years, Zinc oxide (ZnO) nanowhiskers, with good functional and mechanical properties, have been used for the preparation of structural and functional composites. However, the reinforcement mechanism of ZnO nanowhiskers in the composites is not fully understood. In this study, three-point bend tests have been…
Experiments have been carried out to develop multifunctional composites with improved properties and structure for using in air turbines, ballistic armor, cutting tools and atomic reactors. For optimization of sintering process, microstructure improvement and viscosity increase we used MgO,Y 2 O 3 additives. Carbon fi…
Loading frequency effects on FCGR and fracture surface morphology were investigated on pre-strained low carbon steel in high FCGR range. Loading frequency effects showed the different trend between internal hydrogen and environmental hydrogen. The effects of combined condition hydrogen revealed similar tendency of env…
Abstract 93Nb ${1 \over 2}$ → −${1 \over 2}$ NMR line shape and spin–lattice measurements show that microcrystalline PbMg1/3Nb2/3O3 (PMN) powder is dynamically disordered at room temperature, whereas nanocrystalline PMN powder is orientationally frozen out and long‐range ordered at room temperature. The dynamical diso…
The magnetic susceptibility of Ce(1-x)La(x)Os(4)Sb(12), with x ≈ 0.2, exhibits a pronounced maximum at T(m) = 80 K. This T(m) coincides roughly with the temperature below which a small gap, believed to be a hybridization gap, is observed in spectroscopic measurements in undoped CeOs(4)Sb(12). However, a similar anomal…
In order to investigate the effect of radical nitriding on fatigue strength of spheroidal graphite cast iron FCD400, rotating bending fatigue tests were carried out at room temperature. Fatigue strength was increased by nitriding. Fracture started from microshrinkages or abnormal graphites in the same manner as that o…
Hypervelocity impacts on spacecraft in low earth orbit by meteoroids and space debris poses a threat to space missions, and the use of a shield can significantly decrease the probability of a catastrophic failure. Tests have identified that metallic foams have a good shielding performance against hypervelocity impact…
The microbiological influenced corrosion (MIC) behavior of the low alloy steel with granular-Zn-epoxy and flaky-Zn-epoxy coating in the sulfate-reducing bacteria (SRB) solution was investigated with electrochemical impedance spectroscopy (EIS), X-rays diffraction (XRD), scanning electron microscope (SEM) etc. Results…
Nano-Ni/Al 2 O 3 hybrid materials have the crack-healing function by thermal oxidation process such as 1200°C for 6 h in air. In this hybrid material system, crack was filled up by an oxidation product, NiAl 2 O 4 , via outward diffusion of cations along grain boundaries of Al 2 O 3 matrix. Ni/Al 2 O 3 with Y 2 O 3 do…
Silicon nitride (Si 3 N 4 ) ceramics had been produced through pressureless sintering and hot-pressing sintering with MgSiN 2 -Y 2 O 3 or only MgSiN 2 as sintering aids. The influences of the amount of MgSiN 2 and Y 2 O 3 and sintering methods on the properties of Si 3 N 4 ceramics were investigated. The results show…
In this paper, the properties of carbide ceramics (SiC, and B 4 C) from aqueous gelcasting and pressure-less sintering were studied systematically. The optimized sintering process was achieved via a series of experiments with effective control of grain size and microstructure for developing high performance ceramics.…
Ultra-high performance concrete (UHPC) is a new generation of concrete developed through microstructure enhancement techniques for cementitious materials. UHPC exhibits extremely high compressive and flexural strengths exceeding 180 and 30 MPa, respectively, and remarkable durability compared to normal concretes. The…
This study aimed to evaluate borate:amine:copper derivatives in wood for fungal decay protection as well as the permanence of copper and boron in wood. Each of four derivatives of borate: amine:copper prevented fungal decay in wood. Disodium tetraborate decahydrate (borax):amine:copper derivatives with 0.61-0.63% rete…
The application of a multistage drug-delivery system comprising biodegradable nanoporous silicon particles that allow for a site-specific delivery of different imaging or therapeutic nanoparticles is presented by Mauro Ferrari and co-workers on page H278. The image shows a silicon particle that releases a therapeutic…