Materials Literature
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The UKAEA Prototype Fast Reactor at Dounreay had a liquid sodium-cooled core. Following its shutdown in 1994, the liquid metal is being removed from the reactor and other vessels by means of specialized equipment and reacted with an aqueous solution of sodium hydroxide in a special vessel. The reaction products are ne…
Abstract Acceleration of the biodegradation of poly( L ‐lactide) (PLA) was studied. We found that the degradation rate of high molecular weight (1.3×10 5 ) PLA film was greatly increased by the addition of gelatin into the culture medium of the microorganisms. 100 mg of PLA film was almost completely degraded by the f…
Abstract Poly[( R )‐3‐hydroxybutyrate)], P(3HB), is the most common member of polyhydroxyalkanoates, the natural biopolyesters of intrinsic biodegradability and biocompatibility. Abiotic hydrolysis of P(3HB) was investigated in acid and base media by monitoring the formation of two monomer products, 3‐hydroxybutyric a…
This paper reports the successful design and operation of a system to remove highly radioactive cesium from the sodium coolant of the BN-350 reactor in Aktau, Kazakhstan. As an international effort between the United States and the Republic of Kazakhstan, a cesium-trapping system was jointly designed, fabricated, inst…
Abstract First-principle full valence complete active space calculations (CASSCF) are reported for the electronic states of the D 2 h and C 2 v planar isomers of B 4 , B 4 + and B 4 − . This approach is found to reproduce well the experimentally known transition energies for the two lowest excited triplet states of th…
Abstract Mixed transition‐metal oxide spinels exhibit high electrical conductivity and enhanced infrared transmissivity resulting from the presence of small polarons in the NiCo 2 O 4 lattice. Polarons are formed as a result of judicious choice of component metal cations and attendant resident cation charge states. Su…
The molten salt Flibe, a combination of lithium and beryllium fluorides studied for molten salt fission reactors, has been proposed as a breeder and coolant for fusion applications. The melting points of 2LiF-BeF2 and LiF-BeF2 are 460°C and 363°C, but LiF-BeF2 is rather viscous and has less lithium for breeding. In th…
This paper describes the preliminary results of corrosion protection of AZ91D Mg alloy coated with a micro-arc oxidation (MAO) coating. The corrosion behavior of coated substrates was evaluated by means of immersion and electrochemical tests in 5 wt.% NaCl solution. The immersions tests include weight loss measurement…
Abstract Metabolic engineering strategies have been developed based on ever increasing molecular and genetic information of polyhydroxyalkanoate (PHA) biosynthesis in natural PHA producing bacteria, and used for developing recombinant Escherichia coli strains with enhanced PHA biosynthesis activity. Recently, systems…
The orientation dependences of the converse longitudinal piezoelectric coefficient d 33,f are calculated for epitaxial Pb(Zr x Ti 1–x )O3 films with different compositions. This calculation showed that the substrate clamping plays an important role on determining the piezoelectric properties of ferroelectric thin film…
The synthesis and mesophase properties of partially fluorinated alkoxy‐substituted benzoic alkyl and succinimidyl (NHS) esters with one, two and three perfluoroalkyl alkoxy chains are reported. The mesophases were studied using differential scanning calorimetry (DSC), polarizing optical microscopy and X‐ray diffractio…
In this paper attention is given to different parameters playing a role in megasonic cleaning, which is based on gaseous cavitation such as gas type and concentration, acoustic drive pressure and their influence on sonoluminescence, the motion of a void, particle removal efficiency, uniformity and damaging. The cavita…
This paper presents theoretical and experimental results concerning a feedback control system employing a Terfenol-D-based smart actuator. Such magnetostrictive devices exhibit significant hysteresis, which, under some conditions, can generate self-sustained periodic oscillations in the control loop. The paper propose…
Abstract Two mixites from Boss Tweed Mine, Tintic District, Juab County, Utah and Tin Stope, Majuba Hill, Pershing County, Nevada, USA, were analysed by scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) analysis and by Raman spectroscopy. The SEM images show the mixite crystals to be elongated fibr…
63Cu NMR spectroscopy has been used to detect metastable Guinier–Preston–Bagaryatsky (GPB) zones and nanoscale precipitates of equilibrium S-phase (Al2CuMg) in dilute alloys of aluminium containing copper and magnesium with compositions which lie in the α + S phase field. The GPB zones are observed to form rapidly at…
Milotaite, chemically PdSbSe, is a new palladium mineral species discovered in a low-temperature selenium-rich assemblage at Předbořice, Czech Republic. It was observed in only one polished section, where it occurs as rare subhedral grains not exceed-ing 25 m in size. It is embedded in eucairite and tiemannite, and…
Abstract This paper intends to present applications of experimental charge density research in physics, chemistry and biology. It describes briefly most methods for modelling the charge density and calculating and analyzing derived properties (electrostatic potential, topological properties). These methods are illustr…
Abstract The kinetics and thermodynamics of O 2 addition to Co II complexes containing the simple triamine ligand (L) diethylenetriamine (= N ‐(2‐aminoethyl)ethane‐1,2‐diamine; dien) or N , N″ ‐dimethyldiethylenetriamine (= N ‐methyl‐ N′ ‐[2‐(methylamino)ethyl]ethane‐1,2‐diamine; dmdien) in the aprotic solvent dimethy…
Austenitic stainless steel has good weldability but is sensitive to hot cracking such as solidification and liquation cracking. In the present study, specimens of dissimilar metals made from austenitic stainless steel and Al brass were welded by the GTAW process using four different filler metals. Cracks were detected…
A film of polypyrrole/γcyclodextrin (PPY/γCD) was synthesized at a gold electrode by the simple electropolymerization of a 1∶1 mixture of γCD and pyrrole monomer in aqueous solutions. Different voltammetric behaviors were obtained between PPY/γCD and PPY during the electrosynthesis process. Electrochemical impedance s…