Materials Literature
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The microstructural evolution of the CuZnAl shape memory alloys was studied by indirect techniques relating to the atomic migration rate of grain boundaries. Addition elements were used in a Cu-15,5Zn-8,0Al alloy to provide a comparison with the same alloy without microelement additions. The alloys were melted in an i…
The optimization of the energy generated by a MagnetoHydroDynamic (MHD) channel using a superconducting magnet demands the optimization of the magnetic field of the system and of the critical points on the magnet winding. This work must include the development of a high performance superconductor wire suitable for thi…
Molasses containing sucrose, pectins, water and alcohol interacts with lime to form homogeneous blends. Rheological studies indicate that they exhibit viscoelastic behaviours as entangled polymers. Elastic modulus in these blends is much higher than for sucrose/lime/water model system. This difference is attributed to…
A rheological approach of muddy debris flows is presented for environmental engineering and risk assessment purposes. The debris flow is viewed as a hyperconcentrated suspension of non brownian solid particles. Experimental and theoretical studies are presented versus the concentration. The experimental work generally…
CBN grinding wheels are superabrasive tools, with cutting ability higher than the conventional ones, specially used for grinding DTG (Difficult to Grind) materials. Due to the higher hardness and thermal conductivity of the CBN superabrasive grains, when compared with conventional abrasive grains, the use of CBN tools…
The total current-induced force on atoms in a Cu wire containing a vacancy are calculated using the self-consistent one-electron density matrix in the presence of an electric current, without separation into electron-wind and direct forces. By integrating the total current-induced force, the change in vacancy migratio…
The basal transcription machinery of archaea corresponds to the core components of the eucaryal RNA polymerase II apparatus. Thus, archaea possess a complex multi-subunit RNA polymerase, a TATA box-binding protein and a protein termed transcription factor B (TFB), which is a homologue of eucaryal transcription factor…
In this work we use x-ray photoelectron spectroscopy (XPS) to analyze the principal core levels of a ZrO2 thin film deposited on glass using Zr(OPri)3(dpm) (OPri=isopropoxy; hdpm=2,2,6,6-tetramethyl-3,5-heptanedione) as precursor. Besides the general survey, charge corrected binding energies for the Zr 3d5/2, Zr 3d3/2…
We have demonstrated that the population feeding from the I11/24 level to the 1.5 μm fluorescence emitting I13/24 level of Er3+ ions in low phonon energy glass hosts can be enhanced by codoping with Ce3+ under optical pumping at 980 nm. The nonradiative energy transfer Er3+: 4I11/2; Ce3+: 2F5/2→Er3+: 4I13/2; Ce3+: 2F7…
The behavior of cellulose in molten salt hydrates, e. g., LiClO4*3 H2O, ZnCl2*4 H2O, LiCl*5 H2O and mixtures of thiocyanates was investigated. Melts, which give rise to a swelling or dissolution of the cellulose were the focus of interest. The melt composition and species, the water amount and the structure of the coo…
Vacuum ultraviolet absorption measurement was carried out in silica glass over a wide temperature range from 4 to 1900 K, and structure of the absorption edge and its origin have been elucidated. The main factor that determines the Urbach tail of silica glass is the thermal vibration rather than the structural disorde…
We study the effect of inhomogeneities of the lattice in the $S=1/2$ bond-alternating chain by using a quantum Monte Carlo method and an exact diagonalization method. We adopt a defect in the alternating order as the inhomogeneity and we call it ``bond impurity.'' Local magnetic structures induced by the bond impuriti…
The overview of the literature for a 25-year period on the combustion and fire-retardant performance of major commercial aliphatic nylons is presented. It is shown that aliphatic nylons are relatively easily ignitable materials which support combustion and are therefore required to be fire retarded for some applicatio…
For the purpose of grain refinement, development of the microstructure of coarse grain, high purity aluminium during cold asymmetric rolling has been studied by electron backscatter pattern (EBSP) analysis, as well as optical and transmission electron microscopy, and compared with that developed during conventional ro…
Abstract A white calcium bentonite (CaB) from the Kütahya region, Turkey, contains 35 wt. % opal-CT and 65 wt. 9c Ca-rich montmorillonite (CaM). Samples were heated at various temperatures between 100–1300°C for 2 h. Thermal gravimetric (TG), derivative thermal gravimetric (DTG), and differential thermal analysis (DTA…
When pure alumina is sintered at 1620°C, normal grain growth occurs with equiaxial grains and curved grain boundaries. When 100 ppm of SiO 2 together with 50 ppm of CaO is added, abnormal grain growth (AGG) occurs with large grains elongated with straight grain‐boundary segments in the direction of the basal planes. S…
We examined the effects of the transparent fibroin film (silk film) on full-thickness skin wounds. Full-thickness dermatotomies (15 mm x 9 mm) were prepared on the dorsal wall of CRJ:CD-1 nu/nu (ICR nu/nu) mice. The area of the wounds dressed with silk film was reduced to 10% of that made by the dermatotomy 14 days af…