Materials Literature
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A data set from the serine protease porcine pancreatic elastase was collected at atomic resolution (1.1 A) with synchrotron radiation. The improved resolution allows the determination of atom positions with high accuracy, as well as the localization of H atoms. Three residues could be modelled in alternative positions…
The corrosion behavior of mild steel in acetic acid (CH3COOH) solutions was studied by weight loss and potentiostatic polarization techniques. The variation in corrosion rate of mild steel with concentrations of CH3COOH, evaluated by weight loss and electrochemical techniques, showed marked resemblance. From both tech…
The results of experimental and theoretical investigations of nonlinear acoustic phenomena (nonlinear losses, shift of resonance frequency, generation of the third harmonic, and nonlinear sound-by-sound damping) in polycrystalline zinc nonannealed and annealed resonating rods are presented. The measurements were carri…
In the present paper, the effect of the addition of fine particles 1%wt BaTiO/sub 3/ to plain low-density polyethylene (LDPE) on the short-term dc breakdown strength of LDPE is investigated. The Weibull plots are used to analyze the breakdown test results. This indicates that the addition of BaTiO/sub 3/ to LDPE has r…
The jump of the heat capacity in chalcogenide glasses during glass transition is estimated using the number of floppy modes as a free energy. A comparison with experimental data shows good agreement, without using any free parameter. This result allows a determination of the change of the glass fragility and excess th…
The physical, chemical, and biochemical factors that accelerate skin aging have been proposed to activate a self-maintained microinflammatory process, one of the expected end results of which is an imbalance in the turnover of macromolecules in the dermis. Surface peroxides are recognized as controllable factors of sk…
Interfacial properties such as space charge accumulation and breakdown characteristics in crosslinked polyethylene (XLPE)/ethylene propylene diene terpolymer (EPDM) laminates were investigated. Homocharge is observed in EPDM containing 1,4-hexadiene while heterocharge is observed in EPDM containing 5-ethylene-2-norbor…
The ultra-low-frequency (Hz region) elastic behaviour of SrTiO 3 has been examined over a wide temperature range including the cubic-tetragonal transition at T c = 105 K and the quantum paraelectric region ( T < 40 K) using a three-point–bending method. A giant elastic softening has been found in the tetragonal phase.…
Valence-band and core-level x-ray photoelectron spectroscopy (XPS) studies of sulfate and bisulfate ions are reported. Sulfate and bisulfate ions cannot be distinguished in their core XPS spectra. The valence band region shows a significant difference in the relative intensity and separation of two prominent peaks, an…
In order to examine the influence of the dilution of magnetic ions on the crystal and magnetic structure of NixZn1—xO (x = 1, 0.90, 0.80, 0.70) solid solutions we have performed neutron diffraction experiments on each sample at seven temperatures between 10 and 295 K. To determine the Néel temperatures, the magnetic s…
In order to explain and analyze the corrosion process of AISI 304 L stainless steel in the presence of nitric acid condensates, the reduction mechanism of nitric acid was studied on a platinum electrode in various nitric acid solutions (4 mol·L−1, 8 mol·L−1 and 12 mol·L−1) at 100 °C. Classical electrochemical techniqu…
Abstract New inorganic/organic hybrid coating containing epoxidized soybean oil were prepared. Three sol‐gel precursors [titanium (IV) i ‐propoxide, titanium (IV) di‐ i ‐propoxide bis‐acetoacetonate, and zirconium n ‐propoxide] were utilized as the inorganic phase. Various coating properties, including adhesion, hardn…
The corrosion inhibition of steel in phosphoric acid by thiosemicarbazide derivatives has been studied using different chemical and electrochemical techniques. The observed order of increasing inhibition efficiency was correlated with changes in the molecular structures of the inhibitors. Potentiodynamic polarization…
We have studied the critical behavior in ${\mathrm{La}}_{0.5}{\mathrm{Sr}}_{0.5}{\mathrm{CoO}}_{3}$ near the paramagnetic to ferromagnetic transition temperature. We have analyzed our dc magnetization data near the transition temperature with the help of the modified Arrot plot, Kouvel-Fisher method. We have determine…
Pseudomonas lemoignei is equipped with at least five polyhydroxyalkanoate (PHA) depolymerase structural genes (phaZ1 to phaZ5) which enable the bacterium to utilize extracellular poly(3-hydroxybutyrate) (PHB), poly(3-hydroxyvalerate) (PHV), and related polyesters consisting of short-chain-length hxdroxyalkanoates (PHA…
Emission properties of 2.0 μm fluorescence and the energy transfer between Ho 3+ and Tm 3+ in 57PbO·25Bi 2 O 3 ·18Ga 2 O 3 (mol%) glass codoped with Ho 3+ and Tm 3+ were investigated. Cross‐relaxation rates in Tm 3+ increased approximately 5 times when the Tm 2 O 3 concentration was increased from 1.0 to 1.5 wt%. Coef…
Thin films of polymers (polysiloxanes, polycarbosilanes, and polysilazanes) and alkoxide‐derived siloxane gels, precursors for SiC, SiCN, SiOC, and SiOBC ceramics, were irradiated with increasing fluences of C or Au ions to study the kinetics of their conversion into ceramics. Ion beam analyses showed that the main ef…
The effect of heal treatment on the evolution of reactivity of a highly porous pure synthetic char was studied with the aid of Raman scattering measurements. Two sets of experiments were carried out. A) Samples were oxidized in air at 600°C without heat treatment and Raman spectra were measured as a function of conver…
Multi-arm star block copolymers based on ε-caprolactone have been prepared by a core-first approach using propoxylated hyperbranched polyglycerol P(G52PO3) as a polyfunctional initiator. Various monomer/initiator ratios were employed in the Sn-catalyzed polymerization in order to vary the length of the caprolactone ar…
This paper summarises the results obtained in the MICAT (Mapa Ibero-Americano de Corrosão Atmosférica (Latin American Map of Atmospheric Corrosion)) atmospheric corrosion project (an Iberoamerican project on atmospheric corrosion, involving 14 countries and 75 atmospheric test sites) for zinc specimens exposed in the…