Materials Literature
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Ultrasonic irradiation in the presence of ozone was used to efficiently eliminate methyl tert-butyl ether (MTBE) from groundwater. The sonolytic degradation of MTBE was investigated in three different reactor configurations and frequencies: vibrating-plate reactor (VPR, 358 kHz), near-field acoustical processor (NAP 2…
An automobile bumper is a structural component, which contributes to vehicle crashworthiness or occupant protection during front or rear collisions. The bumper systems also protect the hood, trunk, fuel, exhaust and cooling system as well as safety related equipments. A brief description of bumper components and a cri…
In order to investigate the corrosion of pipeline materials in Seabed Sediment (SBS) environment, weight-loss and electrochemical measurements in saturated sand and mud cells with seawater were performed for a simulation. The used electrochemical measurements included linear polarization resistance (LPR) and potentiod…
Reflectivity spectra of HxWO3 and LiWO3 thin films were measured over the photon energy range from 0.4 to 4.2 eV. It was found that microcrystalline tungsten bronzes have reflectances of 8%-30% over the dopant concentration range x (0 < or = x < or = 0.25). Values for the real part of refractive index n were also dete…
Advanced experimental techniques to measure the spectral absorption and oxidation state of silicate glass melts are described. Exemplary results of the characterisation of industrial glass melts by these two methods are presented. The technological impact of the high-temperature optical properties and oxidation state…
Several of the fourteen rare-earth element (plus Sc and Y) orthophosphate standards grown at Oak Ridge National Laboratory in the 1980s and widely distributed by the Smithsonian Institution's Department of Mineral Sciences, are significantly contaminated by Pb. The origin of this impurity is the Pb2P2O7 flux that is d…
We study the formation of the icosahedral Al-Cu-Fe quasicrystalline phase in heat-treated elemental multilayers. Pure quasicrystalline films can be obtained in similar annealing conditions independently of the stacking sequence of the multilayers. Using synchrotron radiation diffraction, we study in real time the succ…
The renormalization of the elastic constants of a polymer-anchored membrane is investigated by means of systematic Monte Carlo simulations. Our results indicate that when polymers are grafted on both sides, and are in the brush regime, the excess bending rigidity scales as N 3 σ α ( N and σ being the number of statist…
The linear thermal expansion of lead halide (PbCl2, PbBr2, PbI2) crystals was measured between room temperature and their melting points. Using the temperature dependence of linear thermal expansion Δl/l, the coefficients of linear thermal expansion α and their temperature dependencies were calculated and the results…
The electromechanical and electric‐field‐induced strain properties of x Pb(Yb 1/2 Nb 1/2 )O 3 · y PbZrO 3 ·(1− x − y )PbTiO 3 ( x = 0.12, 0.25, 0.37; y = 0.10–0.40) ceramics have been studied systematically as a function of Pb(Yb 1/2 Nb 1/2 )O 3 (PYN) content and PbZrO 3 /PbTiO 3 (PZ/PT) ratio. In addition, the effect…
Manganites of the Sm 1− x Sr x MnO 3 system ( x =0.33, 0.4, and 0.45) possess giant negative values of the magnetoresistance Δρ/ρ and the volume magnetostriction ω near the Curie temperature T C . In the compound with x =0.33, the isotherms of Δρ/ρ, ω, and magnetization σ exhibit smooth variation and do not reach satu…
On the basis of absorption spectroscopy data the temperature evolution of Cu2+ ion environment in the layered compounds (CnH2n+1NH3)2CuCl4 (n=2, 3) was studied. For the detailed analysis of experimental data the special program package CrysTool 1.0 based on quantum mechanical models using normalized spherical harmonic…
The vibrational density of states (VDOS) and the heat capacities of amorphous SiO 2 and several (Na 2 O) x (SiO 2 ) 1− x , x = 0.2, 0.333, 0.5, silicate glasses have been calculated using computer models generated by molecular dynamics and the reverse Monte Carlo method. Significant changes in the VDOS upon addition o…
The morphology of Chaetoceros tenuissimus Meunier, a little-known species, has been studied for the first time with electron microscopy. C. tenuissimus has been placed as a synomyn of C. simplex Ostenfeld since approximately 1930, and has been misidentified or neglected in routine phytoplankton counts. The cells are v…
Directive 96/82/EC on the control of major-accident hazards involving dangerous substances, so-called Seveso II Directive, requires inventorying of dangerous substances which are believed might be generated during loss of control of an industrial chemical process. In the present work a nitration process that has under…
Single‐ and double‐walled carbon nanotubes were produced in high yield using the selective reduction of solid solutions of Mg 1– x Co x O in a methane and hydrogen atmosphere at 1000°C. The solid solutions were prepared using combustion synthesis with urea as the fuel. The BET surface areas ranged from 10 to 65 m 2 /g…
Abstract The precipitation of CaCO3 in the absence or the presence of the G4.5 PAMAM dendrimer was carried out by a “carbonate diffusion method”. Formation of crystalline CaCO3 at different feed ratios of the G4.5 dendrimer to calcium ions was studied with the concentration of calcium ions kept at 0.1 M. Although calc…
We have studied corrosion of a stainless steel in nitric acid solution containing neptunium. Using type 304L stainless steel, corrosion tests in boiling neptunium nitrate solution were conducted under immersion and heat-transfer condition. By the weight loss measurement of stainless steel and the quantitative analysis…
The chlorination of uranium metal or uranium oxides in chloride melts offers an acceptable process for the head-end of pyrochemical reprocessing of spent nuclear fuels. The reactions of uranium metal and ceramic uranium dioxide with chlorine and with hydrogen chloride were studied in the alkali metal chloride melts, N…
Nitrided phosphate glasses are characterized by tetrahedral units P(O,N) 4 in which nitrogen atoms have substituted for both bridging and non-bridging double bonded oxygen atoms. 31 P magic angle spinning (MAS) nuclear magnetic resonance (NMR) shows that PO 4 , PO 3 N and PO 2 N 2 tetrahedra may coexist within the gla…