Materials Literature
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The behaviour of silica during the carbothermal reduction nitriding process at temperatures between 1300-1500°C was studied by means of X-ray diffraction and scanning electron microscope analysis. The experimental runs were allowed to proceed up to 1 h in presence of nitrogen flow. The following mechanism of reduction…
The Zn1−xMnxGa2Se4 system with 0.5<x<1, which represents a magnetic dilution of the tetragonal MnGa2Se4, retains the defective chalcopyrite structure of the parent compound. Neutron powder diffraction experiments and temperature dependent magnetic susceptibility measurements show that such dilution has a…
Cardiovascular-related syndromes are the leading cause of morbidity and mortality worldwide. Arterial narrowing and blockage due to atherosclerosis cause reduced blood flow to the brain, heart and legs. Bypass surgery to improve blood flow to the heart and legs in these patients is performed in hundreds of thousands o…
Ag nanoparticles were synthesized by using thermal decomposition of Ag + –oleate complex. The mean size of Ag nanoparticle was confirmed as 10 nm with transmission electron microscopy (TEM). The crystal structure and optical property of Ag nanoparticles were studied with X-ray powder diffraction (XRD) and UV–vis spect…
The structure and magnetic properties of magnetically ordered arrays of magnetic nanowires formed on the basis of porous aluminum oxide films have been investigated by the small-angle polarized-neutron scattering method. Small-angle scattering intensity patterns exhibit several diffraction maxima (up to the third refl…
Morphological transformations of amorphous vanadium oxide films obtained by the sol-gel method and polycrystalline V 2 O 5 films are studied during their low-temperature (295–623 K) reduction in a hydrogen electron cyclotron resonance plasma. The morphology of films is analyzed using atomic force microscopy and high-r…
The rheological properties of new partially aliphatic polyimides in N,N‐dimethylformamide were investigated at different concentrations and temperatures comparatively to their corresponding poly(amic acid)s. The rheological functions,i.e., dynamic viscosity, shear rate, elastic shear modulus, and viscous shear modulus…
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…