Materials Literature
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A study was made on plasma-initiated emulsion polymerization and kind of ultra-high molecular weight poly(methyl methacrylate) (PMMA) was obtained. The viscosity-averaged molecular weight M η of this PMMA is over 1×10 7 in the measurement of viscosity by using Butanone as solvent. Its glass transition temperature T g…
The effects of nitrogen (680 and 1600 ppm) on the microstructure and electrochemical behaviour of thermally aged type 316LN stainless steels is discussed. Electrochemical potentiokinetic reactivation tests indicated a decrease in chromium depleted regions with increasing nitrogen addition in austenitic stainless steel…
The kinetics of the graft polymerization of acrylamide onto some lignosulfonate products in a continuous external magnetic field was studied. The registered magnetokinetic effects were correlated and associated with the conditions of the classic reaction. The grafting process of acrylamide onto the macromolecular chai…
A survey of operating problems and failure mechanisms on LV aerial bundled cables is presented. Previously unknown failure modes are identified and new test procedures are given. The influence of moisture ingress, corrosion, wind, flora, fauna, weathering and overloads is identified and discussed.
The influence of the gravity and interface kinetics on interface shape and interfacial concentration distribution was numerically investigated by using Galerkin finite element method. A boundary mapping technique was used for dealing with free boundary problem. A two-dimensional steady-state model of TGS crystal growt…
Preparative chromatography is a potential application for mesoporous silica due to its high surface area. Mesoporous spheres (MSs) have been prepared quickly from acid solution (see Figure), and their properties with regard to liquid chromatography and high-performance liquid chromatography (HPLC) explored. A new chro…
A model for fatigue crack propagation based on sliding wear of bridging grains is analyzed for polycrystalline ceramics. Taking into account damage development and crack tip energy balance, we have obtained rigorous solutions for equilibrium and compatibility equations in the crack wake under monotonic and cyclic load…
Copolymers of vinylidene chloride (VDC) and acrylates or methacrylates were investigated by calorimetric (DSC) and infrared spectroscopic methods to determine glass transition temperature and crystallization behavior. The final crystallinity of some annealed copolymers of VDC and methyl acrylate (MA) or methyl methacr…
Solid oxide fuel cells (SOFCs) offer many advantages over conventional methods of electrical generation, including higher efficiencies and lower emissions. The environmental benefits of the use phase of SOFCs have been extensively reported, but it is important that the total environmental burden is evaluated. This art…
This paper indicates the possibility of assessing the failure of a strip biaxial tension specimen from the non-linear stress-strain behaviour of a uniaxial tension specimen which is useful for characterizing the propellant material. In order to examine the adequacy of the analytical and finite element methods, test da…
The elastic modulus El of the crystalline regions in the direction parallel to the chain axis was measured by X-ray diffraction for polyimide derived from polyamic acid (biphthalic dianhydride and p-phenylene diamine). These specimens were cured by two different routes: curing at 200 °C, and at 400 °C for 1 h, respect…
Results of an experimental and theoretical study of the optical absorption spectra of spherical quantum dots based on PbS and PbSe are presented. A rigorous theoretical analysis of the energy spectra and optical transitions is performed within the framework of the four-band k·p approximation with full account of the e…
The magnetic couplings between a Ni(II) center in an octahedral environment and two nitroxides in its coordination sphere are calculated by ab initio methods. The system is well described by a Heisenberg model. Fully variational calculations (DDCI2) give results similar to those of combined variational/perturbative ca…
Summary Two sequential extractions with unbuffered 0.1 m BaCl 2 were done to study the release of salt‐exchangeable H + and Al from mineral horizons of five Podzols and a Cambisol. Released Al was found to have a charge close to 3+ in all horizons and in both extractions. This finding was supported by the near‐equalit…
In this paper we present a systematic study of the effect of the substitution pattern in the starting monomers on the resulting properties of some electrodeposited polydidodecylterthiophenes. The compared characterization of p-doping processes in regioregular electropolymerized poly-3‘,4‘- and 3,3‘ ‘-didodecyl-2,2‘:5‘…
The field of protein crystallography inspires and enthrals, whether it be for the beauty and symmetry of a perfectly formed protein crystal, the unlocked secrets of a novel protein fold, or the precise atomic-level detail yielded from a protein-ligand complex. Since 1958, when the first protein structure was solved, t…
The ${}^{27}\mathrm{Al}\mathrm{}\mathrm{NMR}$ spectrum and the spin-lattice relaxation rate of an icosahedral ${\mathrm{Al}}_{72.4}{\mathrm{Pd}}_{20.5}{\mathrm{Mn}}_{7.1}$ quasicrystal were studied in the temperature range from 300 to 4 K at two magnetic fields. The results are compatible with the hypothesis that a sc…
High-transparency, low-electrical-resistivity indium-tin-oxide (ITO)thin films were prepared on quartz substrates using synchrotron radiation ablation at room temperature. The films had a low resistivity (ρ=1.3×10 -4 Ω·cm) and high-transparency properties in the visible region ( T = 83% at 550 nm). X-ray diffraction p…
The effect of divalent substitution into lanthanide sites in La0.7Sr0.3-xCa x MnO3 oxides has been studied. In this system the average size (rA) of the A site cations is systematically varied while keeping the Mn3+ /Mn4+ ratio fixed at 7/3. Polycrystalline samples of La0.7Sr0.3-xCaxMnO3 were prepared using solid-state…
Abstract Oxidation of a dilute aqueous solution of a model azo dye pollutant (Orange II) was studied in batch and continuous well‐mixed (CSTR) reactors. Both reactors operate at 200–250°C, and total pressures up to 50 bar and at oxygen partial pressure from 10 to 30 bar. The model pollutant concentrations were in a ra…