Materials Literature
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The melting process of isotactic poly(propylene) (iPP) sample isothermally crystallized at 130°C for half an hour is carefully studied by means of variable-temperature FTIR spectroscopy and DSC. Based on the IR intensity changes of regularity and conformational bands vs. temperature, it is found that the helical struc…
Conventional computational fluid dynamics (CFD) methods for simulating the flow through automotive exhaust catalysts assume a monolith resistance based on one-dimensional laminar flow. This underpredicts the flow maldistribution in the monolith. Incorporation of an additional pressure loss accounting for entrance effe…
Abstract The hexadentate complex Mg[Ni(1,3-pdta)]•H2O (1,3-pdta = 1,3-propanediaminetetraacetate ion) was prepared and its structure established by X-ray crystallography. The complex salt crystallizes in the space group Pnna (# 52) of the orthorhombic crystal system with a = 13.251(2), b = 11.645(2), c = 13.818(3) Å a…
A particular class of Montgomery's self-imaging objects that we call continuously self-imaging gratings (CSIG's) is introduced. When they are illuminated by a plane wave, these objects produce a field whose intensity profile is a propagation- and wavelength-invariant biperiodic array of bright spots. The mathematical…
Abstract The low‐grade metasediments of the Cameros Basin, northern Spain, host a number of deposits of spectacular quality pyrite mineralization. These formed during regional metamorphism and the pyrite crystals exhibit a wide range of morphologies. On the basis of pyrite crystal habit, the deposits can be classified…
In nematic liquid crystal films doped with methyl-red dye or azobenzene liquid crystal, we have observed extremely efficient optically induced director axis reorientation effects, and refractive index change coefficients >> 1 cm2/W. The basic mechanisms involved are determined to be optically induced space charge fiel…
Calotropis procera (Family: Asclepiadaceae) is known to contain alkaloids, steroids and resinous substance. Different concentrations of its latex were topically applied to the 3rd stage larvae of Musca domestica. A dose of 3 ul (5% of the latex) killed and partially digested the larvae in three hours. The effect of th…
Scale and sludge deposits formed during oil production can contain elevated levels of Ra, often coprecipitated with barium sulfate (barite). The potential for sulfate-reducing bacteria to release 226Ra and Ba (a Ra analog) from oil-field barite was evaluated. The concentration of dissolved Ba increased when samples co…
This paper shows how to determine the electrode contour with the best insulation performance on the basis of an area effect and a volume effect in the breakdown field strength. Previous electric field optimization techniques have provided us only with an optimum electric field distribution, For the design of power app…
Abstract Plastomers are ethylene alpha‐olefin coplymers made from the single site metallocdene catalyst using a variety of polymerization processes. The key features are uniform intermolecular and intermolecular comonomer distribution, low extractables, comonomer dependent. meleting point, and low ashcontent. The unif…
The dielectric, piezoelectric properties, and electric-field-induced strains of the 0.2Pb(Mg1/3Nb2/3)O3–xPbZrO3–(0.8−x)PbTiO3 (x=0.30–0.50) compositions close to the morphotropic phase boundary (MPB) have been systematically investigated as a function of PbZrO3 content (x). The phase approached from the tetragonal tow…
BACKGROUND: To minimize thrombogeneity of small diameter PTFE grafts they are usually coated in vitro with endothelial cells under static culture conditions. The disadvantage of this technique is that a cell layer is formed that fails to withstand shear stress typical in normal blood flow. METHOD: Since the in vivo fu…
The potential global and regional as well as the local environmental effects of the biological treatment of biodegradable polymeric materials are described in this paper. The global effects could be summarised as a decreasing contribution of methane release into the atmosphere by controlled biological treatment of was…
Vanadium oxide has been found to be an effective sintering aid for preparation of dense Ni–Cu–Zn ferrite. The addition of a small amount of V 2 O 5 (1–2 wt%) in the Ni–Cu–Zn ferrite enhances the densification greatly, but reduces the activation energy of densification significantly. Moreover, the grain growth becomes…
The PHAs with different pendant units such as methyl, vinyl, epoxide and hydroxyl groups at the terminus were prepared by biosynthesis or chemical modifications following the biosynthesis. The thermal decomposition behavior of these PHAs have been studied by thermogravimetric analysis (TGA), differential thermal analy…
Brazilian textile mills import wastewater treatment technologies, performances of which are generally evaluated only on a physicochemical basis. Thus, a battery of bioassays was used to evaluate the performance of an ozonation system to treat textile effluents. Comparative toxicological profiles for bacteria (Vibrio f…
Experimental observations on steam generator tubes with a cold-worked surface layer (in as-received condition) and in the electropolished state (surface layer removed by electropolishing) showed a great influence of surface condition on stress corrosion cracking (SCC) initiation. The purpose of this work was to quanti…
The interrelation of physicochemical properties with biological interactions at the interface to understand blood compatibility of materials in contact with blood has been discussed. The bioethics for human experimentation and future research outlook has been projected.
The temperature dependences of Grüneisen parameters for layered crystals of the hexagonal crystal system are constructed. It is demonstrated that the Grüneisen parameters calculated in the framework of the model proposed by I.M. Lifshits for a strongly anisotropic crystal agree satisfactorily with those obtained from…
A new cyclic peptide 1 having an (LLLD)3 configuration pattern was designed that is capable of forming artificial transmembrane ion channels by self-assembly of planar peptide rings, with hydrophilic groups arrayed in the interior of the channel. Ion permeability in the presence of the synthetic peptide 1, cyclo[-Trp-…