Materials Literature
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The results are given of calculations of temperature fields in a plane layer of Al 2 O 3 crystal under conditions of combined radiative-conductive energy transfer under fast heating by concentrated radiation of a CO 2 laser with the formation of a thin layer of melt on the surface. Experiments are performed in the hea…
Extended abstract of a paper presented at Microscopy and Microanalysis 2007 in Ft. Lauderdale, Florida, USA, August 5 – August 9, 2007
International audience
High-resolution transmission electron microscopy (HRTEM) images of dioctahedral 2:1 phyllosilicates (muscovite, paragonite, pyrophyllite, etc.) acquired by intense electron radiation may not record the natural state but rather the dehydroxylate phase, e.g., NaAl 2 Si 3 AlO 11 in the case of paragonite, NaAl 2 Si 3 AlO…
Periploca sepium Bunge (Chinese silk vine) is a woody climbing vine belonging to the family Asclepiadaceae. It originally comes from Northwest China. Periploca resembles the Para-rubber tree, Hevea brasiliensis, regarding a similar body plan to produce a milky exudate containing rubber latex. The Periploca plant was a…
The results of my latest research into molten halides of alkali and alkaline-earth metals by a method of Raman spectroscopy are reviewed. A dynamic criterion for the formation of complexes in melts is considered. The results that testify to the existence of instantaneous and short-lived autocomplexes in these liquids…
The hypothetical protein TTC0263 of Thermus thermophilus HB27 is a thermophilic tetratricopeptide repeat (TPR)-containing protein. In the present study, the TPR region (residues 26-230) was resolved at 2.5 A with R-factors of R/Rfree = 23.6%/28.6%. TTC0263 consists of 11 helices that form five TPR units. Uniquely, it…
Abstract Summary: In this study, two samples of multiwalled carbon nanotubes (MWNT) were synthesized by CVD of acetylene over Fe 2 Co catalysts supported by CaCO 3 using different temperatures. The material produced at 660 °C (MWNT600) shows slightly better performance as evidenced by lower mean tube diameter and bett…
The crystal structure of the synthetic compound Ni 9.54 Pd 7.46 S 15 has been solved and refined to an R-factor of 3.3_. It belongs to the space group Pm 3 m , with a cell edge a of 9.872 A. It is isostructural with the published structures of Pd 17 Se 15 and Rh 17 S 15 . In the structure of Ni 9.54 Pd 7.46 S 15 , Pd…
Extended abstract of a paper presented at Microscopy and Microanalysis 2007 in Ft. Lauderdale, Florida, USA, August 5 – August 9, 2007
Large scale simulation of the colossal magnetoresistance effect in manganites using spin-fermion models is often hampered due to the high computational cost associated with computing the eigenvalues of each of the successive Hamiltonian matrices. Consequently, current spin-fermion model simulations contain no more tha…
BACKGROUND: The de novo design of peptides and proteins has recently surfaced as an approach for investigating protein structure and function. This approach vitally tests our knowledge of protein folding and function, while also laying the groundwork for the fabrication of proteins with properties not precedented in n…
Electrical conductivity, σ(T), of liquid Pb-Bi alloys of eutectic and near eutectic compositions was investigated in the "melting-solidification" temperature region. The revealed discrepancies between the heating and cooling σ(T) curves as well as a hysteresis observed in course of heating-cooling cycles suggest a met…
Aluminotaramite, ideally Na(CaNa)(Fe 3 2+ Al 2 )(Si 6 Al 2 )O 22 (OH) 2 , and alumino-magnesiotaramite, ideally Na(CaNa)(Mg 3 Al 2 )(Si 6 Al 2 )O 22 (OH) 2 , occur in retrogressed eclogites in the Liset kyanite-eclogite pod, near Selje, Vestlandet, Norway. Fluoro-alumino-magnesiotaramite, ideally Na(CaNa)(Mg 3 Al 2 )…
Oxynitride glasses are effectively alumino-silicate glasses in which nitrogen substitutes for oxygen in the glass network, resulting in increases in glass transition and softening temperatures, viscosities (by two to three orders of magnitude), elastic moduli and microhardness. Calcium alumino-silicate glasses contain…
Unidirectional isora fibre reinforced epoxy composites were prepared by compression moulding. Isora is a natural bast fibre separated from Helicteres isora plant by retting process. The effect of alkali treatment on the properties of the fibre was studied by scanning electron microscopy (SEM), IR, thermogravimetric an…
Pressureless sintering of hexagonal boron nitride (BN) with and without additives was performed using a powder which was previously nitrided at 900oC and then heat treated at 1400oC. Sintering additives were B2O3 (2, 4, 6 wt %) and Y2O3 (2, 4, 6 wt %) and sintering temperatures was 1900oC. Sintered samples were charac…
For a singularly perturbed parabolic equation in two dimensions, the formation of a solution with a sharp transition layer from a sufficiently general initial function is considered. An asymptotic analysis is used to estimate the time required for the formation of a contrast structure. Numerical results are presented.
Amorphous silicon carbon nitrogen (SiCN) films deposited on stainless steel by radio frequency magnetron sputtering are annealed at different temperatures in hydrogen to investigate the phase transformation kinetics and the impact on film hardness. The SiCN films with polycrystalline structure are formed after anneali…
In situ X-ray photoelectron spectra (XPS) of metal–octaethylporphyrin [Pd(OEP), Cu(OEP), and Zn(OEP)] and C 60 alternative-deposited films on a silicon substrate are presented for the fabrication of high-performance organic thin-film photovoltaic (PV) cells. XPS results indicated that only Zn(OEP) and C 60 alternative…