Materials Literature
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Abstract We have performed a series of electron irradiation experiments with 300 keV electrons on thin (Mg1.8Fe0.2SiO4) olivine samples in situ in a transmission electron microscope. The irradiation-induced modifications occur in two distinct stages: firstly, stage 1 is the breakdown of olivine into small MgO crystall…
Abstract 1-Tetrathiafulvalenylferrocene and its derivatives have been synthesized in moderate to good yields employing palladium-catalyzed cross-coupling. The oxidation potentials of the title compounds revealed enhanced donor ability of the TTF unit, whereas the donor ability of the ferrocene moiety decreased markedl…
We present the frequency dependence of microwave-absorbing properties of La1−xSrxMnO3 (x=0.4, 0.5, 0.6, and 0.7) powders at room temperature. The absorbing properties change gradually with x in the frequency range of 8–12 GHz. The optimal absorption can be achieved for a x=0.4 sample and its microwave loss peak value…
Reaction of sodium with polycrystalline alumina (PCA) arc tubes in high‐pressure sodium lamps can limit lamp performance. The rate of degradation depends on the grain‐boundary diffusion of a reaction product, aluminum, through the PCA wall. The effects of sintering aids and other dopants on the sodium resistance of PC…
Abstract The K/Ar characteristics of 53 clay assemblages (Triassic–Cretaceous), representing the detrital, volcanogenic and arid-facies clay mineral associations, are interpreted in relation to their mineralogy, chronostratic age and geological origins. The K-bearing mineral components of the 1–2 μm, 0.2–1 μm and <…
Sheet aluminium 2024-T3 alloy was treated in a range of acid solutions. These acid solutions included HNO3, H2SO4, and H3PO4 alone, with HF, and with a combination of the oxidant sodium persulphate Na2S2O8 and HF. Changes in the surface chemistry and morphology of the matrix and intermetallics were characterised by sc…
A scanning vibrating electrode technique (SVET) was applied to make in-situ observations of stress corrosion cracking (SCC) in type 304 steel single crystals exposed to a 2.5 kmol m−3 H2SO4+0.4 kmol m−3 NaCl solution at room temperature. The three-dimensional (3-D) plots of corrosion current density during SCC can be…
The binding of rhBMP-2 to its receptors, the signal transduction cascade and the final responses of bone cells, osteoprogenitor cells and derived cell lines is of high fundamental and clinical interest. In this report concentration-response curves of the osteoblast cell line MC3T3-E1 under influence of rhBMP-2 was inv…
Se estudió la dinámica anual de las poblaciones de dos especies de anfípodos en un microambiente de agua dulce del arroyo Las Flores, afluente del río Luján. Hyalella (Mesohyallela) curvispina es un anfípodo herbívoro que se alimenta principalmente de las algas del fitobentos; Hyalella (Mesohyalella) sp. utiliza como…
Abstract Nanocomposites based on biodegradable poly(e-caprolactone) (PCL) and layered silicates (montmorillonite) modified by various alkylammonium cations were prepared by melt intercalation. Depending on whether the ammonium cations contain non-functional alkyl chains or chains terminated by carboxylic acid or hydro…
In our experiments, we investigate in situ three-dimensional crystals during free growth into pure undercooled liquid xenon. The undercooling Δ T is in the range of 80mK ⩽ ΔT ⩽ 168mK. We initiated morphological transitions of the growing crystal from dendrite to seaweed by a cooling step. The fact that such a transiti…
To develop the new-type poly(L-lactide)-based biomedical material having a wettable surface, the synthesis of poly(L-lactide) with one terminal D-glucose residue was investigated. After the hydroxyl group at 1-C of α-tetrabenzyl glucose, α-Glc(Bzl)4, was converted to the corresponding potassium alkoxide by using potas…
We have performed a series of electron irradiation experiments with 300 keV electrons on thin (Mg1.8Fe0.2SiO4) olivine samples in situ in a transmission electron microscope. The irradiation-induced modifications occur in two distinct stages: firstly, stage 1 is the breakdown of olivine into small MgO crystallites and…
Atomic environments in binary lead silicate and ternary alkali lead silicate glasses
A bismethacrylatesilane monomer (BMS) was prepared via selective Michael addition of aminopropyltrimethoxysilane (APTMS) to the acrylate groups of 2-methacryloyloxyethyl acrylate (ethyleneglycol acrylatemethacrylate, EGAMA). Sol–gel condensation of BMS in triethyleneglycoldimethacrylate (TGDMA) afforded in situ stable…
Although the macroscopic, bulk behavior of liquids wetting (or dewetting) can be adequately explained by viscous flow, the intricate details near the solid/liquid/fluid triple line (TL) are still not totally appreciated.These two aspects correspond to the bases of the hydrodynamic approach and of the molecular kinetic…
Using a previously developed simulation model we study the changes in morphology of two-dimensional chain crystals caused by annealing. A series of various intermediate crystalline states with different stability exhibiting a non-monotonous evolution of the internal energy and the degree of local order was found. This…
Abstract Two new linear tri‐nickel(II) complexes with an infinite polymeric chain, [Ni 3 (μ 3 ‐dpa) 4 (C 4 O 4 Me)](BF 4 ) 1 and [Ni 3 (μ 3 ‐dpa) 4 (N 3 )](PF 6 ) 2 , [dpa − = di(α‐pyridyl)amido anion], have been synthesized and their structures were determined by X‐ray diffraction. Compound 1 crystallizes in the mono…
Short-chain alcohol dehydrogenases (SCAD) constitute a large and diverse family of ancient origin. Several of its members play an important role in human physiology and disease, especially in the metabolism of steroid substrates (e.g., prostaglandins, estrogens, androgens, and corticosteroids). Their involvement in co…
Oxygen 18 O tracer diffusion in Czochralski‐grown mullite single crystals is investigated along [010] and [001]. Oxygen diffusion coefficients range between ∼5 × 10 −20 m 2 /s (1250°C) and ∼9 × 10 −18 m 2 /s (1525°C). The data does not show any significant anisotropy. The values of the activation enthalpy (4.5 eV) and…