Materials Literature
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The ability of a silicone antifoam to retard foaming in a liquor prepared from potatoes is enhanced by the addition of ethoxylated nonionic surfactants. The enhancement is non-linear for surfactant concentration, with all 12 surfactants tested possessing a concentration at which foam heights strongly diminish, referre…
sn-Glycerol-1-phosphate dehydrogenase is responsible for the formation of the sn-glycerol-1-phosphate backbone of archaeal lipids. [4-3H]NADH that had 3H at the R side was produced from [4-3H]NAD and glucose with glucose dehydrogenase (a pro-S type enzyme). The 3H of this [4-3H]NADH was transferred to dihydroxyacetone…
A paramagnetic cobalt carbonyl cluster, [Co10P2(CO)23H]2−, containing two partially-encapsulated phosphorus atoms is synthesized through the reaction of [Co6(CO)15]2− and [Co(CO)4]− with PBr3 in THF.
Calcined powders were prepared for sintering of cubic Cs0.9Al0.9Si2.1O6 by calcining a mixture of Al2O3/SiO2 fine powder and CsNO3 powder at temperatures of 798 to 1123K for 20h in air. The amorphous phase produced in the case of a lower calcination temperature, while the crystallinity of the calcined powder increased…
The effect of gamma radiation on the permittivity ɛ and the electrical conductivity σ of TlGaS 2 crystals is investigated at frequencies of 0.1, 1, and 10 kHz and 1 MHz in the temperature range 200–370 K. It is shown that an increase in the temperature leads to an increase in the permittivity ɛ and the electrical cond…
The chlorine concentration in trichloroisocyanuric acid (TCI) solutions depended on the solvent used to apply the chlorination agent on the rubber surface and on the time after preparation of the solutions. In this study, methyl ethyl ketone (MEK) and ethyl acetate (EA) have been used as solvents for 2 wt% TCI in the…
Novel structured functional hybrid materials can be obtained by incorporating photoresponsive organic components into the silicate walls of periodic mesoporous silicates. Two such materials are described, containing either viologens or stilbene analogs. Thermal or photochemical activation of viologen units generates t…
The refractive index modification of polysilane films by the Ultra-Violet (UV) light irradiation was investigated. Poly(methylphenylsilane) (PMPS) and other polysilanes involving phenyl group attached directly to a silicone atom showed high refractive index (ninit ∼ 1.70) and very large refractive index reduction (Δn…
Hydrogen storage alloys are attracting worldwide attention as hydrogen suppliers to fuel cells. However, several kinetic problems remain to be solved before practical use is possible. A methodology to accelerate reactions of hydrogenation and dehydrogenation and to lower the reaction temperature is strongly required.…
Abstract The second‐order nonlinear optical (NLO) properties of a series of benzothiazole derivatives were studied by use of the ZINDO‐SOS method. These chromophores are formed by a donor‐π‐bridge‐acceptor system, based on a nitro group connected with benzothiazole as the acceptor and a hydroxyl‐functional amino group…
Dielectric constant measurements at low temperature and X-ray diffraction measurements at room temperature were carried out under high pressure up to 1.42 GPa and 10 GPa, respectively, for a hydrogen-bonded crystal CsH 2 PO 4 . By the dielectric measurements, we found a new antiferroelectric phase (AFE II), that is pr…
A new approach for the synthesis of a new type of ternary mesoporous La–Co–Zr mixed oxides with various atomic (La + Co/La + Co + Zr) ratios is reported. The synthesis method combines the advantages of the preparation of the clear soluble homogeneous metal oxides containing a cationic surfactant in acidic medium follo…
Age-hardening characteristics in a dental low-gold alloy composed of 40.0 wt% Au-35.0 wt% Ag-7.9 wt% Pd-7.0 wt% Cu-5.0 wt% In-3.5 wt% Zn-1.5 wt% Sn, were investigated by means of the hardness test, XRD study, SEM observations and EPMA. The following results were obtained. The age-hardening was characterized by a preci…
Micro- and nanomachining cutting tools are currently being developed in order to extend the range of manufacturing technologies available to the micro and nano engineer. Conventional diamond tools used for grinding operations have a number of problems associated with heterogeneity of the crystallites, decreased cuttin…
There are many alternatives for the refractory lining in the sole of an electric arc furnace that produces re-fined ferromanganese, Fe-Mn (80% with low carbon content, %C<1.5). Empiric approaches have usually been used for the design. Even though they allowed increasing the number of tapping, they are not base in a qu…
The synthesis of polyurethanes (PURs) from oligoetherdiol, two low molecular diols, castor oil and 4,4'-Methylenebis(cyclohexylisocyanate) is described. These polymers are characterized by measurements of the mechanical bulk and surface properties, preliminary investigation of compatibility with human blood and calcif…
Germano-silica and alumino-silica Erbium Doped Fibers have been fabricated through a new Nanoparticles Doping process with MCVD technology. These fibers have been characterized in WDM amplification experiments in both C and L band.
Originally, the demands in space technology played the decisive role in the development of ceramic matrix composite (CMC) materials. High mass-specific characteristics and extreme temperature resistance are important selection criteria for materials used in jet engines and thermal protection systems of new space-craft…
It has been well documented that bacteria will readily proliferate during the typical soaking process if left unchecked. Tanners are rightfully concerned about the extent of biological activity in their soaking process and the impact this can have on the grain integrity and strength of the resulting leather. However,…
Sequential interactions between several adhesion molecules and their ligands regulate lymphocyte circulation and leukocyte recruitment to inflammatory foci. Adhesion molecules are, therefore, central and critical components of the immune and inflammatory system. We review the evidence that tobacco smoking dysregulates…