Materials Literature
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Short C−H⋅⋅⋅halogen distances in the crystals and remarkably low-field shifts of the 1H NMR signals of the bridging hydrogen atoms are the characteristic features of the intramolecular C−H⋅⋅⋅halogen hydrogen bonds that are exhibited by several new (1,4-diaza-1,3-diene)titanium and -niobium halides (the structure of 1…
Resistance to sulfur, long life, and high activity are characteristic of silver-containing zeolite catalysts with Brønsted acid centers, which can be used for the reduction of NO2 to N2 in the presence of hydrocarbons [Eq. (1)]. In the proposed reaction mechanism, N2 formation proceeds via intermediate nitro, amino, a…
Analysis of hard a-C:H films with low stress prepared by methane plasma decomposition is reported. Films with hardness as high as 14 GPa and stress as low as 0.5 GPa were obtained. These films have a high Raman Id/Ig ratio (∼1.0), and small Tauc’s band gap (∼0.4 eV). This letter also supplies strong evidence that the…
A very large positive magnetoresistance (MR) has been discovered in a Fe3O4/SrTiO3/ La0.7Sr0.3MnO3 heterostructure for the transport perpendicular to the layer planes and applied magnetic field in the film plane. The observed MR features do not show any obvious correlation with the hysteresis behavior of the ferromagn…
The static value of the effective dielectric constant in a thin film capacitor is simulated by means of the local field theory. The value of it shows a sharp decrease as the film thickness is decreased in an ultrathin film geometry. This phenomenon is due to the size effect intrinsic to a thin film structure and has n…
Using Kohn-Sham wave functions and their energy levels obtained by density-functional-theory total-energy calculations, the electronic structure of the two c(2x2) phases of Na on Al(001) are analysed; namely, the metastable hollow-site structure formed when adsorption takes place at low temperature, and the stable sub…
Optical temperature sensing using upconversion fluorescence emission in Er3+/Yb3+-codoped Ga2S3:La2O3 chalcogenide glass excited at 1.06 μm is reported. Temperature measurements in the region of 20–225 °C with a resolution of approximately 0.5 °C using excitation powers of a few tens of milliwatts were obtained. The t…
Sensitive CaSO<inf>4</inf>:Dy and CaSO<inf>4</inf>:Tm thermoluminescent (TL) phosphors, meeting the criteria for TL dosimetry, were produced using the mineral gypsum (CaSO<inf>4</inf>2H<inf>2</inf>O) of Iran. The results of the optimisation of concentrations of the activ…
During catastrophic processes of environmental variations of a thermodynamic system, such as rapid temperature decreasing, many novel and complex patterns often form. To understand such phenomena, a general mechanism is proposed based on the competition between heat transfer and conversion of heat to other energy form…
Infrared reflectance of alpha'-NaV2O5 single crystals in the frequency range from 50 cm-1 to 10000 cm-1 was studied for a, b and c-polarisations. In addition to phonon modes identification, for the a-polarised spectrum a broad continuum absorption in the range of 1D magnetic excitation energies was found. The strong n…
cis-Dichlorophthalocyaninato(2–)metall(IV) von Zirconium und Hafnium reagiert mit überschüssigem Tetra(n-butyl)ammoniumfluorid-Trihydrat zu Tetra(n-butyl)-ammonium-cis-trifluorophthalocyaninato(2–)metallat(IV), (nBu4N)cis[M(F)3pc2–] (M = Zr, Hf). (nBu4N)cis[Hf(F)3pc2–] kristallisiert monoklin in der Raumgruppe P21/n (…
Two approaches to 3‐D magnetic field calculations for low‐power special transformers are presented in the paper. The application of fast calculation procedures based on the finite difference method, to direct solving of the Poisson and Laplace equations is given. The calculated example deals with the three‐phase leaka…
Dielectric measurement characteristics such as the dissipation factor, relative permittivity and conductivity as a function of temperature and frequency have been achieved on composite materials based on different epoxy resins filled with alumina inclusions. The analysis of the results show the presence of porosity an…
The corrosion inhibition efficiency of a ω-benzoyl alcanoic acid model compound was studied and compared to that of benzoic acid. Electrochemical tests showed that the electrolyte can significantly influence the performance of corrosion inhibitors. A theoretical model that is able to describe the influence of anion an…
Abstract The process of laser-induced electropolymerization of aniline was studied by in situ surface-enhanced Raman scattering (SERS) spectroscopy and cyclic voltammetry (CV). Formation of p-coupled aniline oligomers was confirmed at an electrode potential below the oxidation potential of aniline, and the oligomers w…
Pergularia daemia (Forsk.) Chiov. (Asclepiadaceae), a wild plant of the arid zone of Rajasthan, hasdemonstrated significant antiinflammatory, antipyretic and analgesic activities including the release of prostaglandin. © 1998 John Wiley & Sons, Ltd.
A photoinduced change in the magnetic resonance parameters is observed in trilayer films of the system Fe/Si/Fe. The shifts of the resonance field and the character of the interlayer interaction are investigated as functions of the temperature, illumination of the films, and thickness of the silicon interlayer. It is…
Given any self-similar quasicrystal Λ in Rn with inflation θ&gt;1, we construct bases of L2(Rn) having the following structure: θnj/2ψλ(θjx−λ), λ∈Λ\θΛ, j∈Z, where the mother wavelets ψλ, λ∈Λ\θΛ, are smooth and with exponential decay or compact support. We also show that wavelets ψλ constitute a relatively compact…
Abstract We found out a new family member of hydrogen molybdenum bronze, HxMoO3. The phase exhibited the monoclinic system and appeared as a single phase in the region of 0.45 &gt; x &gt; 0.25. Its interlayer spacing varied largely depending on the hydrogen content.
The catalytic incineration of ethyl mercaptan over a MnO/Fe2O3 fixed bed catalytic reactor was studied. The effects of operating parameters including inlet temperature, space velocity, C2H5SH concentration and O2 concentration were characterized. Three kinetic models, such as power‐rate law, the Mars and Van Krevelen…