Materials Literature
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A despolimerização de poli (tereftalato de etileno) -- PET - em água pura e em soluções aquosas 7,5M de ácido acético, ácido sulfúrico, acetato de sódio e hidróxido de sódio foi testada a 100ºC e pressão atmosférica, com o objetivo de obter ácido tereftálico. Foram ainda quantificadas diferenças relativas à influência…
Abstract We present the first package of Java classes specifically aimed at the handling of structural and biophysical problems. To enable object-oriented programming a basis of fundamental Java classes is required which deals with basic operations of vectors, matrices, amino acid sequences, crystal symmetries and PDB…
Dibenzo[g,p]chrysene, a new π-conjugated polycyclic aromatic hydrocarbon, has been found to function as the core fragment for the preparation of discotic liquid crystals. First two derivatives of this novel core were prepared by a palladium-catalyzed annulation reaction of diphenylacetylenes with 2-iodobiaryls, follow…
The crystal structure and magnetic analysis of a cyclic tetranuclear copper(II) complex with formula [Cu4(phen)4(glyOH)4](NO3)4·2H2O, where phen = 1,10-phenanthroline and glyOH = glycolate are described. Copper atoms are connected through bridging carboxylate groups from chelated glycolate units, forming a butterfly-t…
Fuel cell hybrid power systems have potential for the highest electrical power generation efficiency. Fuel cell gas turbine hybrid systems are currently under development as the first step in commercializing this technology. The dynamic interdependencies resulting from the integration of these two power generation tec…
Dynamic birefringence and dynamic viscoelasticity of polystyrene/tricresyl phosphate solutions were measured over a wide reduced frequency region from the rubbery to the glassy zone for concentrations ranging from 0.20 g cm -3 to bulk. The rubbery (polymeric) component of the modulus whose molecular origin is attribut…
The effectiveness of the combination of thermosensitive liposomes of plumbagin and hyperthermia is described. Small-sized, thermosensitive liposomes were prepared by thin film hydration and subsequent sonication. The liposomes were characterized for size, phase transition temperature, in vitro drug release and stabili…
A model previously shown to provide physically meaningful interpretation of a wide range of polymer−penetrant relaxation-induced non-Fickian (including case II) sorption kinetics, is used here as a basis for a deeper understanding of fundamental case II kinetic features. In particular, we report and discuss model calc…
The first generation of molecular engineering studies whereby a one-dimensional bipolar donor–acceptor conjugated system had served, since the early 1970s, as a quasi-exclusive template, had failed to take into account the tensorial dimension attached to the β quadratic hyperpolarizability tensor. We review here the o…
Most EPDM applications require cross-linking, which is commonly achieved via accelerated sulphur vulcanization. Co-agent-assisted peroxide cure is applied for improving the thermal stability and/or the compression set of EPDM. Activated resol cure is only used for the dynamic vulcanization of PP/EPDM blends, i.e. for…
Temperature dependence of the electrochemical and hydrogen transport kinetic performance of metal hydride electrode have been systematically investigated in the temperature range to The results show that temperature has pronounced effects on a series of characteristics of the electrode. With the increase of temperatur…
The nuclei of spheroidal graphite (abbreviated SG) were studied using an FE-SEM and an EDS. Many kinds of SG irons with different sulfur contents were prepared for the observation of the nucleus-like core materials. The Mg-treated SG iron was cast into a thin CO2 sand mold and a chilled test piece that is usually used…
SiC/SiC continuous fiber-reinforced ceramic matrix composite (CFCC) combustor liners having protective environmental barrier coatings (EBCs) applied to the liner working surfaces have been field-tested in a Solar Turbines’ Centaur 50S SoLoNOx engine at the Chevron, Bakersfield, CA engine test site. This latest engine…
This paper describes tensile properties of a peak-aged Mg–4Y–3RE alloy at room temperature to 823 K with 10−5–10−1 s−1. The Mg alloy exhibited high strength (> 250 MPa) at room temperature to 473 K . However, the strength rapidly decreased at 573 K . It is suggested that a large decrease in strength at 573 K is attrib…
The crystal structure of a new Cu(III) complex with the ligand pds2− (pds, pyrazine-2,3-diselenolate) shows a unique packing pattern with segregated stacks of complex molecules interconnected through the pyrazine N coordination to Na counterions, which complete their coordination environment with four water molecules.
The asymmetric di-aminic compartmental ligands HL5–HL7 form pentanuclear nickel(II) complexes in which the core is assembled from two dinuclear [Ni2L] units which are each linked to the third Ni atom by bridging μ3-hydroxo groups; the crystal structure of [Ni5(L5)2(OAc)6(OH)2], 1 [HL5 is the proligand 2-{[(2-dimethyla…
Postirradiation microstructure examinations of Zr-2.5Nb pressure tubes removed from service in CANDU™ reactors have shown clear trends in the dislocation structure and the state of the β-phase, as a function of operating temperature, neutron flux, and time. These microstructural parameters correlate well with changes…
A new bending device was developed which allows continuous change of the bending radius of the BSCCO tape sample at 77 K and a simultaneous measurement of the critical currents. The samples are mounted free between two clamps. The special geometry of the arrangement insures over the whole range a sample shape with hom…
Histomorphometric and histopathological evaluations of the effects of fresh leaf extract of Calotropis procera on the reproductive organs of male wistar rats given 20mg\\gm body weight of the extract once daily, orally, for varying number of days showed varying degrees of desquamation of seminiferous epithelial cells,…
There are numerous reasons for which film coatings are applied to pellet formulations; for example, controlled release, taste masking, and improved stability. The aim of this paper was to study the influence of pellet shape on the deposition of film coatings in a fluid-bed process by monitoring the pellet shape as a f…