Comment on: "Even-odd behavior of conductance in monatomic sodium wires"
In this comment, we give a simple analytical proof for the even-odd behavior of the conductance of atomic wires.
Materials Literature
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Étude de l'effet du mouvement relatif cristal/liquide sur la croissance d'un cristal dendritique dans un liquide en surfusion
Ce travail experimental vise a mesurer l'impact du mouvement relatif solide / liquide sur la croissance de grains equiaxes en chute libre. Pour cela, nous avons developpe un dispositif rendant possible le suivi tridimensionnel et in situ de cristaux equiaxes sedimentant dans un liquide surfondu. Les experiences ont et…
Toxicity and hazardous properties of solvent base adhesive wastes
In this work, the hazardous properties of solvent base adhesive wastes generated in the footwear manufacturing process have been studied. The characterisation procedures and criteria used are those contained in the legal documents European Union Council Decision 94/904/CE and October 13th Spanish Ministerial Order. Th…
Application of Brightness of Scanning Electron Microscope Images to Measuring Thickness of Nanometer-Thin SiO2 Layers on Si Substrates
When a surface of a silicon wafer, on which a nanometer-thin SiO 2 layer is selectively formed, is observed by a scanning electron microscope (SEM), the brightness of the SEM image at the SiO 2 portion is stronger than that of the bare Si portion, and the brightness increases with the increasing thickness of the SiO 2…
Thermoplastic Elastomers 4. Poly(ether-ester-imide)s Derived from Trimellitic Anhydride, 1,6 Diaminohexane,1,4-Dihydroxybutane and Poly(ethylene oxide)
Four thermoplastic elastomers having the structure of poly(ether-ester-imide)s, PEEIs, were prepared and characterized. The hard segments were synthesized from 1,4-dihydroxybutane and from an imide dicarboxylic acid based on 1,6-diaminohexane and trimellitic anhydride. Poly(tetramethylene oxide)-1000, poly(ethylene ox…
Comportamento térmico do 8-quinolinol e seus nitro-derivados
<abstract language="eng">The compounds 5-nitro-8-quinolinol and 5,7-dinitro-8-quinolinol were obtained by nitration of the chelant 8-quinolinol. The compounds were characterized through EA, MNR, XRD, IR, TG, DTA and DSC. It was verified through thermal analysis that the compounds show consecutive processes of sublimat…
Effect of Reducing Atmosphere on Electrical Properties of Sol–Gel-Derived Pb(Zr,Ti)O3 Ferroelectric Films on Textured LaNiO3 Electrode
Reducing-atmosphere treatment at 400°C for 10 min was performed on sol–gel-derived Pb(Zr,Ti)O 3 (PZT) thin films, which were spin-coated on a LaNiO 3 /Pt/Ti/SiO 2 /Si substrate and annealed. The reducing atmosphere does not produce any significant change of the preferred orientation perovskite structure of these ferro…
Preparation of Heteropoly Acid Entraped in Nano Silica Matrix
Heteropoly acid entraped in nano silica matrix was prepared by the microemulsions method. The primary particle size was less than 400nm and it decreased with the content of the heteropoly acid. When these silica particles were blended with sulfonated polyethersulfone, the HPA could be effectively immobilized in aqueou…
Condensed State Molecular Dynamics in Sorbitol and Maltitol: Mobility Gradients and Conformation Transitions
Molecular mobility in sorbitol and maltitol is studied in order to understand their differences near the junction between the α and β relaxations. The molecular dynamics simulations performed on the polyols in their bulk state give support to the 13C NMR results and imply that the mobility of a carbon atom located at…
Supramolecular side chain liquid crystalline polymers assembled via hydrogen bonding between carboxylic acid-containing polysiloxane and azobenzene derivatives
Supramolecular side chain liquid crystalline polymers were prepared from poly(3-carboxypropylmethylsiloxane) (PSI100) and azobenzene derivatives through intermolecular hydrogen bonding (H-bonding) between the carboxylic acid groups in the PSI100 and the imidazole rings in the azobenzene derivatives. The existence of H…
Effect of Oxygen Content on the Electrical Transport Properties of La0.4Ca0.6MnO3?y
The effect of oxygen content on the electrical transport properties of La0.4Ca0.6MnO3—y was studied. Upon decreasing oxygen content, the lattice parameters a, b and c of the samples increase and the electrical resistivity of the samples also increases abruptly, contradicting what is expected in terms of Mn4+/Mn3+ rati…
Study of crack growth in solid propellants
The stress and displacement fields in an edge‐cracked sheet specimen made of a solid propellant and subjected to a uniform displacement along its upper and lower faces was studied. The solid propellant was simulated as a hyperelastic material with constitutive behaviour described by the Ogden strain energy potential.…
Surface Segregation Study of Transparent ZnGa2O4 Films by XPS
Sol-gel colloidal suspensions were used to elaborate ZnGa2O4 films by spin coating on glass and MgO substrates. Those films were annealed at 600 °C (10°/min) for l h in air and showed good mechanical resistance as well as very good transparency. XPS spectra recorded from 0 to 1200 eV indicated that the films contained…
Interactions between stainless steels and sulphur anions in liquor mixtures typical of kraft pulp digesting
Interactions of certain stainless steels (UNS S30400, S31603 S32205, S32304, hard chromium plated S31603 as well as hard chromium plated S32205) and sulphur anions in concentrations typical of kraft liquors were investigated using wave length dispersive X-ray fluorescence (WDXRF) and contact electric resistance (CER)…
Synthesis and pyrolysis of polysilazane precursors containing linear–cyclic structures for Si/N/C‐based ceramics
Abstract A new kind of polysilazane precursor containing linear–cyclic structure was synthesized from the de‐lithium chloride condensation reaction of hexamethylcyclotrisilazane lithium salts (D ) and 1,3‐dichlorotetraorganodisilazanes [(ClR 1 R 2 Si) 2 NH]. Pyrolyses of these precursors and some comparable linear pol…
Residual Stress Behavior in Methylsilsesquioxane-Based Dielectric Thin Films
Residual stress of methylsilsequioxane film, which was spin-coated on silicon substrate and followed by soft-baking, was measured in-situ during curing and subsequent cooling with varying processing conditions. The thickness and refractive index of the cured films were measured using ellipsometry. Their structure was…
The interrelationship between fabric crease recovery and pressing performance
Creases are marks that are created and left in a fabric during garment wear. Pressing is a process to flatten garment panels and sharpen garment edges and pleats. To minimize crease, the fabric should recover after pressing without creating a creased edge. Whereas, good pressing performance means the creased edge stay…
On the Stokes shift of the Ce3+5d4f luminescence in inorganic crystals
The Stokes shift between the 2F5/2 → 5d absorption and the 5d → 2F5/2 emission of Ce3+ is known for at least 230 different inorganic compounds. Compounds with an anion coordination polyhedron around the Ce3+ ion either in the form of a tri-capped trigonal prism, Edshammer polyhedron or in the form of a (anti)-cuboctah…
Phase stratification in the Nd1 − xBaxCoO3 − δ (0.3 ≤ x ≤ 0.54) system
Slowly cooled Nd 1 − x Ba x CoO 3 − δ samples were two-phase in the concentration interval 0.3 ≤ x ≤ 0.46. One of the phases had O -orthorhombic lattice distortions ( Pbnm ) characteristic of ferromagnetic samples with x ≤ 0.3, and the other phase had tetragonal distortions ( P 4/ mmm ) characteristic of samples with…
Determination of optical constants of thin films and multilayer stacks by use of concurrent reflectance, transmittance, and ellipsometric measurements
Using measurements of reflectance, transmittance, and the ellipsometric parameter D, we have determined the thickness, refractive index, and the absorption coefficient of various thin films and thin-film stacks. (D, the relative phase between the p- and s-polarized components, is measured for both reflected and transm…