Solubility of carbon dioxide in molten alkali-metal nitrates
The solubility of CO 2 in the series of molten alkali-metal nitrates is volumetrically measured on improved equipment, and the thermodynamic characteristics of dissolution are calculated.
Materials Literature
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Structural and Thermodynamic Properties of Wurtzitic Boron Nitride from First-Principle Calculations
Using ab initio plane-wave pseudopotential density functional theory method, we have studied the structural and thermodynamic properties of the wurtzite boron nitride (w-BN). Through the quasi-harmonic Debye model, in which the phononic effects are considered, the dependencies of the normalized lattice parameters a /…
Characteristics of Rubber/Sodium Montmorillonite Nanocomposites Prepared by a Novel Method
In order to enhance the fine dispersion of hydrophilic sodium montmorillonite (Na‐MMT) in the matrix of hydrophobic rubber, the hydrophobic modification of Na‐MMT was carried out via an in situ method in the melt compounding process using the modifiers poly(ethylene glycol) monooleate or poly(ethylene glycol) diacryla…
Molecular Dynamics Simulations of Graphite at High Temperatures
Graphite, a key structural and moderator material in the proposed Generation IV roadmap, is expected to experience irradiation at temperatures up to 1800 K. In this study, a molecular dynamics (MD) code is developed for the purpose of performing atomistic simulations of high-temperature graphite. The MD computations a…
Foaming of Polymer Blends – Chance and Challenge
The foaming behaviour of polymer blends was systematically investigated using carbon dioxide as a blowing agent. Two batch-processing techniques were used to prepare specimens of different size. Various binary mixtures over a wide compositional range were selected as reference materials, in particular including immisc…
A Soft Computing Model for Predicting Yarn Tenacity
A soft computing model for predicting yarn tenacity from fiber properties and yarn parameters is developed. Because the number of samples is limited, the artificial neural network to be established must be a small-scale one. This soft computing model includes two stages. Firstly, the fiber properties and yarn paramete…
Work Function Increase of Al-Doped ZnO Thin Films by B+ Ion Implantation
The work function of an Al-doped ZnO (AZO) thin film can be increased via B+ ion implantation from 3.92 eV up to 4.22 eV. The ion implantation has been carried out with the ion dose of 1 x 10(16) cm(-2) and ion energy of 5 keV. The resistance of the B+ implanted AZO films has been a bit raised, while their transmittan…
Metal–insulator transition and colossal magnetoresistance: relevance of electron–lattice coupling and electronic phase separation
In this article, we review the insulator–metal transition and the colossal magnetoresistance effect in manganites. The relevance of electron–lattice coupling and the resulting Jahn–Teller polaron is elaborated. The general features of electronic phase separation, which results from disorder and strain effects, are dis…
Synthesis of lipophilic tetraphenylporphyrins to design lipid-porphyrin ensembles
Synthesis of symmetrical meso-arylsubstituted porphyrins with long chain hydrophobic substituents in the phenyl rings was achieved. The lipoporphyrins can be used to design supramolecular lipid ensembles of nanometer size.
Some fatty acid oxadiazoles for corrosion inhibition of mild steel in HCl
Inhibition effect of some fatty acid oxadiazoles on the corrosion of mild steel (MS) in aqueous solution containing 1 N HCl was investigated by weight loss, potentiodynamic polarization technique, electrochemical impedance spectroscopy and scanning electron microscopy. The adsorption of these compounds was found to ob…
Finite Element Modelling of the Warp Knitted Structure
The finite element modelling of the Charmeuse warp knitted fabrics is the main subject of this paper. The proposed model consists of a three-dimensional representation of the warp knitted fabric microstructure and a mechanical analysis of the defined unit cell. An iterative calculation procedure was used for the defin…
Molecular Mobility of Unfilled and Carbon-Black-Filled Isoprene Rubber: Proton NMR Transverse Relaxation and Diffusion
Abstract In an effort to understand the effect of ultrasound on the devulcanization of gum and filled isoprene rubber vulcanizates, solid state NMR 1 H transverse relaxation (T 2 ) was employed to analyze rubber molecular mobility. The T 2 relaxation decay of the unfilled and the black filled IR was successfully descr…
Iron(II) complexes of hexaphenyl(1,2,5-thia/selenadiazolo)-porphyrazine: the direct replacement of Se by S in the 1,2,5-selenadiazole ring
Iron(II) complexes of hexaphenyl(1,2,5-thia/selenadiazolo)porphyrazines have been prepared as bis(pyridine) adducts [Py2Fe(XN2)PAPh6] (X = S, Se) from the corresponding MgII complexes obtained by template co-cyclotetramerization of diphenylfumarodinitrile with 1,2,5-thia/selenadiazolo-3,4-dicarbonitriles, and the unus…
Application of RF Varactor Using BaxSr1-xTiO3/TiO2/HR-Si Substrate for Reconfigurable Radio
In this paper, the potential feasibility of integrating Ba(x)Sr(1-x)TiO3 (BST) films into Si wafer by adopting tunable interdigital capacitor (IDC) with TiO2 thin film buffer layer and a RF tunable active bandpass filter (BPF) using BST based capacitor are proposed. TiO2 as a buffer layer is grown onto Si substrate by…
Kinetics and mechanisms of Cl2 or HCl plasma etching of copper
An investigation by experiment and computer simulation is reported into the kinetics and mechanisms of the interaction between copper and impinging reactive species as the former is etched with a chlorine or a hydrogen chloride plasma. It is established that the manner in which etching proceeds is substantially the sa…
EUNOTIA ARIENGAESP. NOV., AN EPILITHIC DIATOM FROM BRAZILIAN AMAZON
Eunotia ariengae, an epilithic diatom from an acidic spring in Barcarena County, northern Brazil, was described. This taxon forms branched chains united at the poles and attaches to substrates by mucilage pads. It is morphologically similar to tropical species E. dacostae Metzeltin & Lange-Bertalot, but it can be clea…
Nature of active sites in a Fe-Beta catalyst for NOx selective catalytic reduction by NH3
A correlation is observed between the rate of NO x selective catalytic reduction by NH 3 over Fe-Beta and the number of isolated FeIII species characterised by an ESR signal at g ≈ 4.3, which is a function of total Fe loading and Si/Al ratio.
Degradation of X‐Ray Contrast Media Compounds by Combined Ozone and Ultrasound
The aqueous degradation of iodinated X-ray contrast media (ICM) by the combination of ozone and ultrasound has been studied. Experiments were conducted at a constant ultrasound frequency of 20 kHz, at five power densities up to 0.235 W/mL, and various ozone centrations. In experiments involving dissolved ozone in solu…
Dependence of the heat capacity of La1−x Ag x MnO3 manganites on the Ag content
The heat capacity of La1−x Ag x MnO3 manganites with x = 0.1, 0.15, and 0.2 is measured in the temperature range 77–350 K. An analogy between the effect of doping and the effect of a magnetic field on the temperature dependence of heat capacity of the La1−x Ag x MnO3 system is revealed. As lanthanum is replaced by sil…
Influence of Coupling Agent on Properties of Carbon Black-Reinforced SBR and NR/SBR Vulcanizates
Influence of the coupling agent on properties of carbon black-reinforced rubber compounds and vul- canizates was studied. Four styrene-butadiene rubber (SBR) compounds with different SBR types and five NR/SBR blend compounds with different rubber compositions were compared. Bis-(3-(triethoxysilyl)-propyl)-te- trasulfi…