Materials Literature
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The separation of hydrogen isotopes is an essential element for tritium processing systems. A new process invented at the Savannah River Site, has been developed at Valduc facility: Thermal Cycling Absorption Process. This system uses palladium packed in a column to absorb a stream of hydrogen isotopes. By repeated he…
Baumstarkite is a new mineral found coating miargyrite from the San Genaro mine, Huancavelica Department, Peru. It is triclinic and the third naturally occurring modification of AgSbS 2 besides monoclinic miargyrite and cubic cuboargyrite. The composition is usually close to the ideal formula. However, some grains of…
Perovskite-type complex ferrite La1—xSrxFeO3 (x = 0–0.3) nanoparticles of different particle sizes were prepared using the sol–gel method. The influence of the Sr content and particle size on the microstructure and magnetic properties has been investigated. Increasing Sr content and increasing particle size lead to la…
Five new organic volatile corrosion inhibitors (VCI) were synthesized using 1,6-diaminohexane with various acids such as cinnamic acid (C9H8O2), nitrobenzoic acid (C7H5O4N), phthalic acid (C8H6O4), maleic acid (C4H4O4), and orthophosphoric acid (H3O4P), and their inhibiting action on corrosion of aluminum, zinc, and m…
Inhibition of cubic‐rhombohedral phase transformation and low‐temperature sintering at 1000°C were achieved for 10‐mol%‐Sc 2 O 3 ‐doped cubic‐ZrO 2 by the presence of 1 mol% Bi 2 O 3 . The powders of 1‐mol%‐Bi 2 O 3 –10‐mol%‐Sc 2 O 3 ‐doped ZrO 2 were prepared using a hydrolysis and homogeneous precipitation technique…
Atomistic computer modeling methods are used to investigate the surface structures and stabilities of magnesite MgCO 3 and dolomite MgCa(CO 3 ) 2 in comparison with calcite, CaCO 3 . The surfaces are generally more stable than magnesite, but less so than calcite. Upon hydration, the magnesite {101̅4} surface becomes m…
NMR determinations of fluorine environments in transparent oxyfluoride glass‐ceramics were made to learn about the crystallization of LaF 3 , as well as to ascertain the structural role of fluorine in the surrounding glassy matrix. The fraction of fluorine in LaF 3 was measured as a function of heat treatments, demons…
The study of a diffractive device for polarimetric applications is reported. The device consists of a diffraction grating recorded by two interfering opposite circularly polarized beams and is based on a Langmuir–Blodgett film of an azo-compound material. This material provides long-time stability and high photoinduce…
Abstract Baked products lose quality by loss of moisture, staling and mould growth. The objective of this study was to determine the possibility of reducing mould growth during bread storage through interaction with active packaging film. Cellulose acetate films containing 0%, 2% and 4% sodium propionate were prepared…
Redistribution reactions are used in the synthesis of several preceramic polymers. Moreover, redistributions play a major role in the pyrolysis of these precursors. Examples of thermal redistributions involving the exchange of Si—O/Si—X bonds (X = O, H, C, …) in polysiloxanes, precursors to silicon–oxygen–carbon ceram…
In conventional structure refinement, the discrepancy between the calculated magnitudes and those observed in X-ray experiments is attributed to errors inherent in preliminary assigned values of the model parameters. However, the chosen set of model parameters may not be adequate to describe the structure factors prec…
This article describes the admittance-frequency feature of a class of SnO2⋅CoO-based polycrystalline ceramics with high nonlinear current–voltage characteristics (nonlinear coefficients above 50). Broad relaxation peaks caused by the presence of deep trap states were characterized based on the admittance response of d…
Gray scale image analysis is used to evaluate visual features of wrinkles in plain fabrics made from cotton, linen, rayon, wool. silk, and polyester. The angular second moment, contrast, correlation, and entropy extracted from the gray level co-occurrence matrix are measured as visual feature parameters. The fractal d…
UNLABELLED: ENDscript is a web server grouping popular programs such as BLAST, Multalin and DSSP. It uses as query the co-ordinates file of a protein in Protein Data Bank format and generates PostScript and png figures showing: residues conserved after a multiple alignment against homologous sequences, secondary struc…
The effect of a strong electric field on the metal-insulator phase transition in vanadium dioxide was studied. It was found that the field application to a silicon-silicon oxide-silicon nitride-vanadium dioxide (Si-SiO 2 -Si 3 N 4 -VO 2 ) heterostructure shifts the critical temperature of this transition toward lower…
The water detritiation system (WDS) of tritium plant for the International Thermonuclear Experimental Reactor (ITER) was designed. The concept of the Combined Electrolysis Catalytic Exchange (CECE) process was selected for the WDS. The design conditions are (a) tritium concentration of waste water: 3.7 × 1010∼3.7 × 10…
Polymerization of tyrosine derivatives has been carried out by using two enzymes, peroxidase and protease, as catalyst to give poly(tyrosine)s with different structures. Tyrosine ester hydrochlorides were oxidatively polymerized by a peroxidase in a buffer. Using a high buffer concentration produced the polymer in goo…
Flexural creep tests were performed on sisal-fiber-PCL (polycapro-lactone)-starch composites at different temperatures. The creep compliance increased with the increase of temperature and with the decrease of the fiber content. However, the fragmentation of the polymer macromolecules and the natural fiber fragmentatio…
A pyridoxamine equivalent, 9-aminothioxanthene 10,10-dioxide, has been designed that is capable of affording transamination in good to excellent yields of natural as well as artificial amino acids. Amidines and guanidines in catalytic amounts were capable of performing [1,3]-proton transfer in the imines under mild co…
A crystalline salt has been synthesized that contains H(+) and Na(-) rather than the usual hydride oxidation states of H(-) and Na(+). The key is irreversible encapsulation of H(+) within the cage of 3(6)adamanzane (Adz). The internal proton is kinetically inert to reduction by Na(-) in solution in NH(3)-MeNH(2) mixtu…