Materials Literature
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In this work, the effects of neutron irradiations (1021 n/m2 and 1022 n/m2 doses) on photoluminescence of several fused silica grades with different OH contents are studied. Neutron irradiation induces three emission processes: at 4.2 eV with maximum excitation energy around 4.95 eV and halfwidth of 0.27 eV, at 1.9 eV…
A good approximation for the electron self-energy or the electron quasiparticle properties is needed for an accurate calculation of x-ray absorption spectra. The GW approximation (GWA) has been found to be relatively reliable in predicting the quasiparticle energies and lifetimes in a large variety of systems. For sol…
In this paper, two types of detectors, one with a coplanar and the other with a sandwich geometry using an identical CVD diamond film, were fabricated in order to investigate the effects of the film microstructure on the performance of diamond film alpha-particle detectors. An average charge collection efficiency of 4…
The molecular second-order nonlinear optical properties of planar (E)-4-[2-(4-(N-methyl-N-hexadecylaminophenyl)ethenyl]pyridine (L1) and [cis-Ir(CO)2ClL1] and of the significantly twisted new chromophores (E)-4-[(5,6,7,8-tetrahydro-5-isoquinolylidene)methyl]-N-methyl-N-hexadecylaniline (L2) and [cis-Ir(CO)2ClL2] are r…
We studied Langmuir and Langmuir–Blodgett (LB) films of several strong nonlinear optical (NLO) active amphiphilic derivatives of 1,3-indanedione-5,6-dicarboxylic acid. The surface pressure–area (π–A) isotherms at the air–water interface were investigated at different temperatures and pH values. Non-centrosymmetric Z-t…
The structure and morphology of a precipitation product in an Al–10Mg–0.5Ag (mass%) alloy aged isothermally at 240°C have been characterised using transmission electron microscopy and microbeam electron diffraction. A metastable T phase (Mg32(Al, Ag)49, b.c.c., a=1.41 nm) which is identified by the electron microdiffr…
Crevice corrosion was investigated in pure iron exposed to a strong acetate buffer solution. The specimens experienced the potential drop inside the crevice, which resulted in the formation of passive, active, and hydrogen evolution regions. The distribution of hydrogen evolution occurring inside the crevice was mappe…
A series of low-symmetry metal-free tetraazaporphyrin (TAP) derivatives, i.e. monobenzo-substituted (1H2), adjacently dibenzo-substituted (2AdH2), oppositely dibenzo-substituted (2OpH2), and tribenzo-substituted (3H2) TAP derivatives, has been investigated by the combined use of electronic absorption, MCD, and CI calc…
Xerogels containing thiol groups (1.0–2.7 mmol g– 1 ) and having high specific surface areas of 630–970 m 2 g– 1 were obtained by the sol–gel method using a structure-forming agent [1,2-bis(triethoxysilyl)ethane or 1,4-bis(triethoxysilyl)benzene] and a functionalising agent (3-mercaptopropyltrimethoxysilane).
Lanthanum stannate pyrochlores, La2Sn2O7 and La2SnMO7(M = Mn, Fe, Co, Ni, Cu), were successfully prepared by citric acid method and confirmed by XRD. TG and TPR characterizations showed that the introduction of transitional metals resulted in significant impacts on the structures and redox performances of prochlores.…
The effect of dielectric split-ring resonators (SRRs) on the transmitted signal of a microstrip line is evaluated. The ground plane of the microstrip line is modified with the inclusion of the SRRs. This technique leads to the design of a band-stop phenomenon. The frequency response measured in the X-band constitutes…
Sodium titanium orthophosphate NaTi2(PO4)3 crystals were synthesized and their luminescence properties were investigated. Luminescence spectra of this compound consist of two main bands in the green and red spectral regions. Maximum positions of the bands depend on temperature of the samples. At some conditions the re…
The paper presents the results of strain gauge experiments conducted in order to determine the strain and stress distributions in all groups of human tooth crowns in terms of the proper occlusal loadings. The features simulating masticatory loadings have not been considered. The results have been compared with the num…
Crash behaviour and light weight have become the major design criteria for car bodies. Modern high strength steels offer appropriate solutions for these demands. The prediction of the crash behaviour in simulation programs requires the information on materials behaviour during dynamic testing. The reduction of the sig…
Shaped silver nanoparticles with sphere, wire and dendrite were prepared by sonoelectrochemical deposition from an aqueous solution of AgNO3 in the presence of ethylenediaminetetraacetic acid disodium salt (EDTA) and polyvinylpyrrolidone (PVP). The diameter of spherical silver particles was about 30 nm. The diameter o…
Corrosive conditions in BWRs are determined mainly by hydrogen peroxide (H2O2). Then, a high temperature, high-pressure H2O2 water loop was fabricated to identify the effects of H2O2 on corrosion and stress corrosion cracking of stainless steel. By changing concentrations of H2O2 and O2, in situ measurements of electr…
Abstract Hydrotalcites (HTs) or layered double hydroxides (LDHs) are in the literature also described as anionic clays, due to their layered structure with a charge opposite to that of smectites. Most of the naturally occurring hydrotalcites are members of the pyroaurite-sjögrenite group. Manasse (1915)proposed in 191…
Un nouveau genre de diatomees, Labellicula, est decrit a partir de quelques echantillons de sol provenants de l'ile de la Possession (archipel Crozet, Subantarctique). Ce genre naviculoide presente certainesaffinites avec Brachysira, Diadesmis, Fistulifera, Neidium et Luticola mais presente aussi une combinaison de ca…
Mechanical milling (MM) process is applied to SUS316L austenitic stainless steel powder and a nano-duplex structure formation behavior is investigated. A nano grain structure with BCC phase forms in surface region of the powder milled for 720 ks. Those nano grains have the grain size of less than 20 nm. The (α+γ) nano…
We report on numerical simulations of the grain-boundary varistor behavior recently observed in -doped of high purity. The aim of this study is to disclose the nature of the nonlinear electrical properties of the grain boundaries in oxygen ion conductors. Under small voltages , the simulation shows a linear current-vo…