Materials Literature
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Biomaterials derived from ex vivo tissues offer a viable alternative to synthetic materials for organ replacement therapies. In this study, we describe the use of a tissue engineering scaffold derived from ex vivo arterial tissue to assess vascular cell adhesion within a three-dimensional perfusion bioreactor. With th…
Abstract Degradable segmented poly(ether‐ester‐urethanes) of variable segment chemistry and content were synthesized and characterized. Polycaprolactone diol, a series of poly(ether‐ester) block copolymers, and a diisocyanate giving non toxic degradation products were used to form the prepolymer. Cyclohexane dimethano…
Paclitaxel (Taxol) has demonstrated clinical activity in non-small-cell lung cancer (NSCLC), but its use has not led to marked improvements in survival. This ineffectiveness can in part be attributed to inadequate delivery of effective drug levels to the lung via systemic administration and to drug resistance mechanis…
A Power-electronic interface for supercapacitive-storage based substation in DC-transportation networks is proposed, which allows to feed as a current-source in any voltage conditions of the line. The system has been designed as a com-Pensation-substation to be placed at weak points like end-of-line stations, and can…
Abstract Three crystallographic phases have been observed for LiKSO 4 crystals between room temperature and the melting point. The study of these phases has involved many researchers for more than two decades of intense experimental investigations. Many publications with controversial results are found in the literatu…
Laser pump and X-ray probe core-level photoemission experiments probe surface photovoltage transients on p-type Si(111) surfaces. The data are consistent with a picture where the dynamics of mobile surface charge dominate the photovoltage shift, with changes in the surface-states charge density of only secondary impor…
The kinetics of the reaction of the tetrakis(1-methylpyridium-4-yl)porphyrin tetracation, [ H 2 ( TMPyP )] 4+ , with gold(III) ions were studied along with equilibria of gold(III) species in aqueous medium at 25°C, I = 0.10 M ( NaNO 3 ). The equilibrium constants for the formation of [ AuCl 4-n ( OH ) n ] - ( n = 0,…,…
Vickers indentation cracks are an appropriate tool to determine the crack‐tip toughness K I0 of brittle materials as ceramics from the total crack opening displacements. In addition, the residual stresses occurring in the surrounding of an indentation can be evaluated. The fracture mechanics procedure is described in…
The effect of adsorption of the donor and acceptor molecules on the spectra of photoluminescence and electron spin resonance (ESR) of microporous silicon is studied. It is found that photoluminescence of microporous silicon is quenched, the photoluminescence peak shifts to shorter wavelengths, and the intensity of the…
A theoretical model for the chain modes' contribution to the depolarized light scattering (DLS) spectrum of polymers is developed. It is shown that the frequency dependence of the DLS susceptibility spectrum is similar to that of the shear loss modulus. Specifically, the contribution of chain modes to the DLS spectrum…
The results of studying the dose dependences of the decay kinetics of phosphorescence excited by X-ray radiation in luminescent ZnS-Cu ceramic material before and after irradiation with 50-MeV protons are considered. An anomalous variation in the exponent of the hyperbolic phosphorescence curves was observed experimen…
Berkeleya adeliensis Medlin is a tube-dwelling diatom commonly associated with the bottom level of land-fast ice and the underlying unconsolidated layer or “platelet ice”, in Antarctica, particularly in Adélie Land. This taxon often accounting for a great proportion of the biomass (up to 108 cells 1−1) exhibits a colo…
Abstract Plastic deformation of metallic materials up to large strains is, in many cases, characterised by the activation of different deformation modes and the formation of complicated, locally inhomogeneous substructures, which give rise to both significant lattice strains and rotations. A suitable tool for the inve…
In order to understand the single-step molten state reactivities of a diaromatic isocyanate (4,4’ dPDhenylmethane diisocyanate MDI), the mechanisms and reaction kinetics were modelled using a monofunctional aromatic isocyanate (para-tolyisocyanate p-TI) and hydroxytelechelic polyols (polyethylene glycol PEG) (polyprop…
An acoustic attenuation spectroscopy as a powerful technique is used to study the relaxation processes in phosphate glasses containing Cu+ conductive ions of the system CuI-CuBr-Cu2O-P2O5 with respect to ion transport mechanisms. The acoustic attenuation spectra exhibit several distinctive peaks, corresponding to tran…
Photoluminescent fibers with a sheath-core morphology are produced to impart good mechanical properties. Both photoluminescent and mechanical properties are examined for these fibers with respect to photoluminescent pigment concentrations in the core, draw ratios, and polymer types. The photoluminescent pigment concen…
The crystal structure of the beryllium-rich cordierite [(Na0.28Ca0.19)(H2O)0.92](Mg1.86Fe 0.14 22− ) · { Al3.39Be0.61Si5O18} was established by X-ray diffraction analysis (IPDS Stoe diffractometer, λMoKα radiation, graphite monochromator, 2θmax = 65°, R = 0.0186 for 1378 reflections): a = 16.850(3), b = 9.729(2), and…
Abstract The precipitation and deposition of calcium sulfate dihydrate (gypsum) on brass heat exchanger surfaces from aqueous solutions has been studied using a highly reproducible technique. It has been found that gypsum scale formation takes place directly on the surface of the heat exchanger without any bulk or spo…
In this study, we examine, in detail, the synthesis of single wall carbon nanotubes (C-SWNTs) with a plasma torch, using molecular sources for both carbon and catalyst (typically a carbon-containing gas such as ethylene and ferrocene for the metal catalyst). A comparison of the results obtained by Raman spectroscopy,…
Oxygen-deficient La 0.67 Sr 0.33 MnO 3−α solid solutions have been studied. A comparison is made with the results obtained in an earlier study of a similar lanthanum-calcium manganite series. The physical characteristics of both series are accounted for as being due to a change in the Mn 3+ /Mn 4+ ratio caused by oxyg…