Materials Literature
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The static electronic longitudinal polarizability (α) and second hyperpolarizability (γ) of all-trans planar polyacetylene chains have been computed at different levels of approximation by varying the bond length alternation (BLA) along the conjugated backbone. Although the restricted Hartree–Fock (RHF) and second-ord…
The preparation and characterization of microparticles produced from a new class of functionalized, biodegradable, comblike graft copolymers is presented. The copolymers are polyester-polyamino acid hybrids, composed of a poly(L-lactic acid-co-L-lysine) (PLAL) backbone, and poly(L-lysine), poly(D,L-alanine) or poly(L-…
Zirconia, titania, titania–alumina and silica–alumina supported and unsupported MnOx catalysts were prepared and characterized by X-ray diffractometry and photoelectron spectroscopy, infrared spectroscopy and nitrogen sorptometry. Their catalytic activities were tested towards total oxidation of carbon monoxide and me…
The concept of molecular switching within a cyclic four-stage process is introduced on the basis of two structurally fused photochromic systems (A–D). The synthesis of 1,8a-dihydro-2,3-bis(2,5-dimethyl-3-thienyl)azulene-1,1-dicarbonitrile (open/closed A) is described; irradiation with UV light leads to an equilibrium…
Niobia-supported cobalt catalysts were prepared by incipient wetness impregnation and were characterized by X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), temperature-programmed reductioon (TPR) and magnetic measurements. At least two different types of cobalt…
Broader usage of biodegradable plastics in packaging and disposable products as a solution to environmental problems would heavily depend on further reduction of costs and the discovery of novel biodegradable plastics with improved properties. As the first step in our pursuit of eventual usage of industrial food waste…
Superconducting samples with to line T c values as high as 126 K were obtained in the Ba-Ca-Cu-O system by means of high-pressure synthesis. The X-ray powder diffraction pattern obtained for the as-synthesized 126 K phase was indexed with a tetragonal unit cell and lattice parameters, a=3.85 Å and c=28.3 Å. When expos…
Two new candidates for nonlinear optical (NLO) materials, [MoOS3Cu3(SCN)(Py)5] (1) and [WOS3Cu3(SCN)(Py)5] (2), were synthesized. They show nest-shaped skeletal structure. The crystal structure of compound (1) was characterized by X-ray diffraction. The NLO properties of 1 and 2 were determined through the Z-scan tech…
The EPR investigations of Cu 2+ doped K 2 Zn(SO 4 ) 2 .6(H 2 O) and (NH 4 ) 2 Zn(SO 4 ) 2 .6(H 2 O) Tutton salts in a temperature range of 4.2-300 K are reported. The analysis of the temperature dependences of the g -factors points to significant differences between Jahn-Teller Cu(H 2 O) 6 2+ complexes in the ammonium…
Capacitive couplers are widely used as sensors for in-service/online partial discharge (PD) measurement in rotating machines. They are permanently installed in operating generators and motors to detect partial discharges. The capacitive couplers traditionally used for PD detection on rotating machines have been 80 pF.…
Dominique Laurier, Denis Bard; Epidemiologic Studies of Leukemia among Persons under 25 Years of Age Living Near Nuclear Sites, Epidemiologic Reviews, Volume 21
In methanol, the sodium complex of the monovacant Lindqvist-type nitrosyl polyoxomethoxomolybdate [Mo5O13(OMe)4(NO)]3– reacted with a number of divalent or trivalent cations, including Ca2+, Sr2+, Ba2+, Ce3+, Eu3+ and Bi3+, to yield 2∶1 complexes of the type [X{Mo5O13(OMe)4(NO)}2]n– which have been isolated as tetrabu…
The hydrothermal syntheses, crystal structures and thermal behaviours of three new 3-D framework molybdenum(VI) oxide hybrid materials, [MoO 3 (pyz) 0.5 ] 1 (pyz=pyrazine), [{Cu(pip) 0.5 }MoO 4 ] (pip=piperazine) 2 and [H 2 Mo 2 Cu 3 O 10 ] 3, are presented. 1 and 2 that are hybrids of inorganic oxide layers and bridg…
The influence of the synthesis route of Mg 2 Co hydrogen-storage alloy has been studied. It is shown here that mechanical alloying (MA) allows one to obtain crystallized products after milling for 100 h. It seems to crystallize in a face centered cubic structure (a=1.153 nm). However, when the milling is continued bey…
Chromium and boron compounds have potential for structural applications which require high temperature strength because of their high melting point, chemical stability, hardness and strength. Ball-milling of elemental powder mixtures without external heat application has been processed as a mechanism for the mechanoch…
An effective model is presented for the evaluation of the electric field dynamics inside electrical components, using nonlinear stress grading materials. The model, implemented in a numerical procedure, permits the solution of the Laplace equation and the diffusion equation by adopting the Galerkin method. Two-dimensi…
The robustness of density functional theory cluster model predictions for a variety of adsorbate complexes in Cu-exchanged zeolites is tested via systematic comparisons of four different models. Results for O, O2, OH, CO, N2, NOx, and SOx binding, obtained using an Al(OH)4 representation of the zeolite support (Z), ar…
Several new ferrocene-functionalised porphyrins and a ruthenocene-functionalised porphyrin have been synthesized and studied using electrochemistry, electronic absorbance and resonance Raman spectroelectrochemical techniques. The porphyrin and ferrocene are observed to have limited effect on each other with the proper…
Flatband potentials of boron‐doped polycrystalline and single crystal chemical vapor deposition and high‐temperature, high‐pressure diamond electrodes were estimated by three photoelectrochemical methods (i) as the photocurrent onset potential, (ii) from the dependence of photopotential on the light intensity, and (ii…
Curve fitting analysis of Al K-edge XANES is employed as a novel characterization method for the quantitative estimation of tetrahedral and octahedral Al in various aluminas.