Materials Literature
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We report on the realization of wide band gap (5–6 eV), single-phase, metastable, and epitaxial MgxZn1−xO thin-film alloys grown on sapphire by pulsed laser deposition. We found that the composition, structure, and band gaps of the MgxZn1−xO thin-film alloys depend critically on the growth temperature. The structural…
We considered the trans → cis photoisomerization dynamics of the S 2 -excited azobenzene derivatives in terms of the potential energy gap between the n-π* (S 1 ) and the π-π* (S 2 ) state. The photoisomerization dynamics of trans -4-aminoazobenzene ( trans -4-AAB) which has an energy gap (3000−4000 cm -1 ) rather smal…
The specific surface area of amorphous Aerosil 200 and silica particles with 270 nm diameter prepared by the Stoeber method was investigated by a variety of experimental methods: nitrogen adsorption at 77 and 253 K; adsorption from ethanol/cyclohexane mixture; heats of wetting measurements; small-angle X-ray scatterin…
Supported transition metal oxides and vanadium-containing multi-metallic oxides were investigated to develop new catalysts for the catalytic destruction of highly toxic polychlorinated aromatic pollutants such as polychlorinated benzenes, polychlorinated dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs), and/or bipheny…
Silver nanoparticles with an average size of ∼5 nm were deposited on the surface of preformed silica submicrospheres with the aid of power ultrasound. Ultrasound irradiation of a slurry of silica submicrospheres, silver nitrate, and ammonia in an aqueous medium for 90 min under an atmosphere of argon to hydrogen (95:5…
Relationship among Wigner crystal, charge order and Mott insulator is studied by the path-integral renormalization group method for two-dimensional lattices with long-range Coulomb interaction. In contrast to Hartree-Fock results, the solid stability drastically increases with lattice commensurability. The transition…
This paper proposes a method to analyze a magnetic frequency tripler using the Preisach model. Waveforms of the triple-frequency output voltage and the input current are calculated. The calculated results are in good agreement with the measured ones under both open circuit condition and loading condition. The proposed…
Abstract Energy calibration in an Auger electron analyser has been studied using elastically backscattered primary electrons (BPEs), with a feasibility of 15 meV(σ) for the kinetic energies of 10–1200 eV in which our improved cylindrical mirror analyser (CMA) has been used. An electron gun with a special tungsten cath…
The current-voltage (I-V) characteristics of PbGa2Se4 single crystals grown by the Bridgman-Stockbarger method with a resistivity of 1010–1012 Ω cm were measured. The value of the majority carrier mobility μ=14 cm2 V−1 s−1, calculated by the differential method of analysis of I-V characteristics, makes it possible to…
We study the dynamics of the Na atoms in amorphous Na2O-4SiO2 by means of molecular dynamics computer simulations. We find that at low temperatures the preferential pathways of these atoms form a well-connected network of pockets and channels that is quickly explored by each atom. We show that even for long times the…
Tetramethylammoniumcyansulfit zersetzt sich in SO2 bei -70 °C in HCN, [(CH3)4N]+HSO4- � SO2 und [(CH3)4N+]2S2O72- �2SO2. Eine Reaktionsfolge der Zersetzung wird diskutiert. Die gebildeten Salze werden durch Infrarot- und Ramanspektroskopie sowie durch Einkristallröntgenstrukturanalyse charakterisiert. [(CH3)4N]+HSO4-…
Abstract An experimental study of the characterization melt spinning cyclopolyolefins is presented. The shear and complex viscosities were measured and the data was found to fit the Cox-Merz relation. The birefringence of the melt-spun filaments was determined and correlated with spinline stress. These were found to b…
A novel method to reduce eddy currents within the iron pole plates of a 0.3 T NdFeB MRI magnet is presented. Using an ANSYS code the effect of the eddy currents on build-up of the gradient fields is firstly investigated. Based on the simulated analysis, a couple of eddy current suppressing layers are designed to be di…
The correlation of deposition parameters with output functions when using a novel rotating cryostat (RC) system to produce magnetic materials has been investigated here. In order to do this, an orthogonal design technique was applied for magnetic material production using a resistively heated furnace. The results of o…
End amino functional groups of the hyperbranched aromatic polyamide were chemically modified with acryloyl chloride or methacryloyl chloride. Self-crosslinking reactions of the acryloyl and methacryloyl functionalized hyperbranched aromatic polyamides were carried out in the DMF solution containing AIBN at 100 'C for…
Photoluminescence of porous silicon with different nanostructure morphologies and silicon monocrystalline wafers used as substrates was studied comparatively. The photoluminescence intensity of mesoporous and nanoporous silicon was established to be related to the excitation intensity by the quadratic and linear depen…
Using the Mott–Littleton approach we examine the energies of a number of fundamental optical transitions, as well as those involving self-trapped holes of Mn4+ and O− in LaMnO3 lattice. The reasonable agreement with the experiment of our predicted energies, linewidths and oscillator strengths leads us to plausible ass…
Edible coating based on carboxymethyl cellulose (CMC) and stearic acid were applied on green bell peppers (Capsicum annuum L.) samples in order to investigate its effects as protecting agent to enhance natural characteristics of products. Samples were submitted to three lots according to: (T1) uncoated; (T2) coated in…
In the present work, diamond nanoparticles with sizes of ∼2–70 nm have been produced by Ar+ ion irradiation at the fluence of ∼1022 cm−2. With the help of transmission electron microscope, electron diffraction, and Raman spectroscopy, these nanoparticles’ shape and size were determined and their crystal structure was…
Using monolithic alumina ceramics as the reference, the thermal shock behavior of the hot‐pressed alumina matrix ceramics with 3 mol% neodymium titanate was investigated. The thermal shock resistance of the materials was evaluated by water quenching and a subsequent three‐point bending test to determine the flexural s…