Materials Literature
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For studying certain boiling phenomena of superheated liquids, new methods for deactivating nucleation sites were developed. They were based either on the local cooling of the test liquid in contact with the solid surfaces to subcooled or nearly saturated conditions or on replacement or covering of the vapor cavities…
Photoinduced visible light emission from porous silicon can be reversibly quenched by a wide variety of chemical species. The growth of a thin layer of oxide on the porous silicon surface disrupts the quenching ability of most species, narrowing down the number of quenchers to include primarily those which act as Brön…
MoS2 intercalated with Mn, Co, Ni, and Ru species, prepared from single layer MoS2 dispersions in water, were studied by x-ray absorption spectroscopy. M. K-edge EXAFS results (M = Mn, Co, Ni) are consistent with an alternating MoS2-M(OH)2 layered structure. For the Mn and Co intercalates the MoS2 layers were found to…
The Na2O-rich region of the phase diagram of Na2O-Al2O3-H2O system has been re-investigated. The triple points and solubility curves involving two sodium aluminate hydrates have been determined at 30 °C. The Na2O-rich aluminate hydrate is identified to be 4Na2O · Al2O3 · 12H2O by a tracer method. The phase diagram has…
The conditions of the existence and transformations of surface electromagnetic waves (SEWs) on metals (surface plasmons) and dielectrics (phonon-polaritons) are discussed. Interferometric SEW experiments provide the possibility for the direct determination of the real and imaginary parts of the dielectric constants at…
The influence of bulk conductivity on the PTC effect of Nb‐doped barium titanate is investigated. Both macroscopic and microscopic resistance measurements are performed as a function of temperature. The macroscopic measurement refers to the whole sample while the microscopic one, obtained by photolithography technique…
A method is proposed on the basis of electronic structure calculations to predict the substitution behaviour of alloying elements in TiNi compounds. The electronic structures of 36 elements occupying both Ti and Ni sites in TiNi are calculated using the discrete variational-X a cluster method. A diagram is drawn using…
The idea of stimulating a cooperative Jahn-Teller effect in undercritical electronic systems using an external stress, which does not belong to the symmetry of the quadrupolar ordering, was recently suggested theoretically. The rare-earth oxide compound ${\mathrm{TmPO}}_{4}$ (tetragonal zircon structure) is discussed…
The diffusion of implanted Sn in α-Ti has been studied in the 873–1073 K temperature range using the Rutherford back-scattering spectrometry technique. For this purpose we have implanted Sn in α-Ti samples with two different impurity contents. The measurements in those with a lower level of impurities show that the di…
The appearance of the skin is dependent on the optical properties of the various layers of tissue and the presence of pigments. In order to reproduce the lifelikeness of the skin in developing digital prostheses, a multiple layered moulding technique was utilised. The prosthesis was moulded in two coloured layers, an…
Inhibitors of collagen such as cis-4-hydroxy-L-proline (cHyp) may ameliorate bleomycin (bleo)-induced pulmonary fibrosis. An alternating polymer of poly(ethylene glycol) (PEG)-lysine (PEG-Lys) with cHyp attached as a pendant side chain was prepared for intratracheal delivery with bioinactive trans-Hyp (tHyp) polymer a…
Enzymatic polymerization of alkyl phenols derived from a renewable resource, viz., cashew nut shell, has been carried out in a dioxane-water mixture. The reaction and reaction products have been characterized by a number of spectroscopic, microscopic, and thermometric methods. These monomers have also been copolymeriz…
Intrinsic failure of a knitted Dacron aortic bifurcation graft 19 years after implantation is reported. Failure was due to inability of the dilated and deteriorated left graft limb to hold anastomotic sutures. Numerous transverse cracks and breaks were detected in the Dacron filaments, in addition to small holes throu…
The tensile properties of high- and low-purity Fe–9, –18 and –30Cr alloys irradiated by neutrons up to a dose of 5 × 1024 n/m2 (E >1 MeV) at 613, 673, or 763 K have been examined. The yield strength and the ultimate strength are increased and the elongation is decreased by irradiation. The enhancement of these strengt…
The reported study of charge density waves at low temperatures is based on a microscopic theory. One feature of a charge density wave at low temperatures is a large shift in the chemical potential near its defects, such as solitons, dislocations, and pinning centers, which leads to a higher conductivity of material al…
EPR analysis shows that the anion radical of 2,6-dinitrotoluene (DNT) in liquid ammonia exists with the counterion (either K(+) or Na(+)) associated with one of the two nitro groups. This tight association (-NO(2)(*-)M(+)) persists after solvent removal, and it renders the anion radical very susceptible to loss of met…
DMe-DCNQI forms highly-ordered ultrathin films on various single crystal surfaces. NEXAFS reveals flat lying molecules for all investigated film thicknesses (up to 40 layers) on nearly all substrates under investigation (Ag(111), Ag(100), Cu(100), Cu(111)). The C1s and N1s NEXAFS spectra of these condensed layers show…
The effects of the variations in concentrations of hydrogen (0−480 mol/m 3 ) and 1-butene (0−380 mol/m 3 ) on the gas-phase copolymerization of ethylene and 1-butene over a MgCl 2 /SiO 2 -supported Ti catalyst were investigated using a semibatch reactor operated at 70 °C. Polymers were characterized by size exclusion…
The temperature dependence of transmission loss for IR-transmitting chalcogenide glass fibers of sulfur (S)-based, selenium (Se)-based and tellurium (Te)-containing glasses were investigated above room temperature. The influence of temperature on transmission loss significantly depended upon the kind of chalcogen elem…
The charge-voltage (Q-V) relationship of ferroelectric capacitors experiencing arbitrary applied voltages is investigated both theoretically and experimentally. The complex behavior and history dependence of a ferroelectric capacitor in response to arbitrary voltage patterns can be well described by a parallel-element…