Materials Literature
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Corrosion inhibition of steel in phosphoric acid (H3PO4) by thiosemicarbazide derivatives was studied using different chemical and electrochemical techniques. Protection efficiency up to 99% was obtained with small amounts (10−4 M) of cinnamaldehyde thiosemicarbazone (CTSCN). The order of increasing inhibition efficie…
Abstract Sorptive properties of organoclays may be greatly influenced by the physicochemical properties of organic sorbates. Hexadecyltrimethylammonium(HDTMA) clays were prepared using a high-charge smectite (HDTMA-SAz-1), a low-charge smectite (HDTMA-SWy-2), and an illite (HDTMA-ILL). The resultant organoclays were u…
The effects on microbiologically induced corrosion (MIC) of carbon steel resulting from the presence of corrosion products in the biofilm of sulphate reducing bacteria (SRB) have been investigated. The SRB were isolated from the Changqing oilfield in China. Electrochemical impedance spectrometry and a hydrogen monitor…
Atomic structures and macroscopic translation states for ∑5(310)[001] symmetrical tilt grain boundaries in the body-centred cubic transition metals Nb. Ta, Mo, and W have been calculated in the local-density-functional theory by means of total-energy and force calculations with an ab initio mixed-basis pseudopotential…
We have performed an evaluation of calculated and measured electron inelastic mean free paths (IMFPs) for selected materials and for electron energies between 50 eV and 10 000 eV. This evaluation is based on IMFPs calculated from experimental optical data and on IMFPs measured by elastic-peak electron spectroscopy. Th…
A new pathway to synthesize poly(hydroxyalkanoic acids) (PHA) was constructed by simultaneously expressing butyrate kinase (Buk) and phosphotransbutyrylase (Ptb) genes of Clostridium acetobutylicum and the two PHA synthase genes (phaE and phaC) of Thiocapsa pfennigii in Escherichia coli. The four genes were cloned int…
The synthesis of aligned, monodispersed boron carbide nanofibers has been achieved by the 1025 °C pyrolysis of the compound 6,6‘-(CH2)6(B10H13)2 absorbed into a porous alumina matrix, followed by dissolution of the alumina with aqueous HF. SEM studies show that the nanofibers are ∼45 μm in length with diameters of ∼25…
Two different types of BaTiO 3 seed particles, normal and twinned seeds of ∼30 μm on the average, were prepared from crushed sintered specimens. Normal seeds were obtained from the usual BaTiO 3 sintered compacts, while twinned seeds containing a double twin were obtained from BaTiO 3 compacts sintered with 2 mol% of…
Aromatic amino acid aminotransferase (ArATPh), which has a melting temperature of 120 degrees C, is one of the most thermostable aminotransferases yet to be discovered. The crystal structure of this aminotransferase from the hyperthermophilic archaeon Pyrococcus horikoshii was determined to a resolution of 2.1 A. ArAT…
It is shown that lattice disorder induced by Nb and Ca substitution has a strong influence on the dielectric and relaxational properties of ${\mathrm{KTaO}}_{3}.$ Both substituents are believed to occupy off-center positions at the Ta site, and the difference in valence between the ${\mathrm{Ca}}^{2+}$ and ${\mathrm{T…
Electronic and magnetic properties of the perovskitelike compounds of ${R}_{0.5}{A}_{0.5}{\mathrm{MnO}}_{3}(R=\mathrm{Gd},$ Dy, Ho, Er; $A=\mathrm{Sr},$ Ca) have been studied by measuring lattice parameter, electrical resistivity, magnetic susceptibility, and magnetization. All the Sr-doped compounds show a transition…
Ultrafine (<0.1 μm) high‐purity θ‐Al 2 O 3 powder containing 3–17.5 mol%α‐Al 2 O 3 seeds was used to investigate the kinetics and microstructural evolution of the θ‐Al 2 O 3 to α‐Al 2 O 3 transformation. The transformation and densification of the powder that occurred in sequence from 960° to 1100°C were characteri…
MOTIVATION: Crystallographers were motivated 10 years ago to develop a simple and consistent data representation for the exchange and archiving of data associated with the crystallographic experiment and the final structure. As this process evolved (and the data grew at near exponential rates) came the recognition tha…
Den vermeintlichen Nachteil nutzen: Die eher enttäuschende Reaktivität der Metall-Stickstoff-Bindung im Vergleich zur Metall-Kohlenstoff-Bindung ließ die Amidometallchemie nach ihrer Blüte Ende der sechziger, Anfang der siebziger Jahre etwas in Vergessenheit geraten. Heute nutzt man genau diesen Nachteil, um durch Ami…
Temperature dependence of heat capacities of organic superconductors, $\ensuremath{\kappa}\ensuremath{-}{(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\ensuremath{-}\mathrm{T}\mathrm{T}\mathrm{F})}_{2}{\mathrm{Cu}[\mathrm{N}(\mathrm{CN})}_{2}]X (X=\mathrm{Br}$ and Cl), was measured by chopped-light ac calorimetry between 1…
Fluorescence recovery after photobleaching was used to measure in-plane dye-probe diffusion coefficients, D, in thin films of monodisperse polystyrene supported on fused quartz substrates. The substrates were prepared with a high density of surface hydroxyl groups which interact favorably with repeat units of the poly…
The dilatometric properties of polymer films near and above their glass-transition temperatures were explored using capacitive high-frequency detection in temperature ramping as well as in harmonic temperature cycling experiments. The broad applicability of capacitive scanning dilatometry is demonstrated by the invest…
This paper addresses the modeling of strains and forces generated by magnetostrictive transducers in response to applied magnetic fields. The magnetostrictive effect is modeled by considering both the rotation of magnetic moments in response to the field and the elastic vibrations in the transducer. The former is mode…
Phase-change optical disk technology in the early days dealt with three issues: cyclability, erase characteristics and sensitivity. These were resolved by materials development, and disk layer structure technologies. This paper shows the high (carrier to noise ratio) C / N recording characteristics of a multi-level ph…
In metallic manganites with low Curie temperatures, a peculiar softening of the magnon spectrum close to the magnetic zone boundary has experimentally been observed. Here we present a theory of the renormalization of the magnetic excitation spectrum in colossal magnetoresistance compounds. The theory is based on the m…