Materials Literature
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Electrical conductivity and dielectric relaxation studies with a wide range of compositions of lithium ion conducting glasses belonging to the ternary glass system Li2SO4-Li2O-B2-O3- have been carried out over the temperature range 150-450 K and between 10 - 10(7) Hz. DC conductivities exhibit two different activation…
Dissipative dynamics of a tunneling, methyl-like rotor, whose spatial coordinate is weakly coupled to a thermal bath, are described using the reduced density matrix (RDM) approach. It is found that, owing to selection rules imposed on thermally induced transitions by the symmetrization postulate, there are two sorts o…
Copolymers of styrene and ethyl acrylate are prepared by radical polymerization and analysed with respect to microstructure by means of nuclear magnetic resonance. Using 13C NMR, the compositional styrene- and ethyl acrylate-centered triads can be determined and compared to theoretical values. Good agreement between e…
A practical‐scale cell with a trickle‐bed electrode was developed for on‐site electrochemical production of hydrogen peroxide by the cathodic reduction of oxygen. Terminal voltage and current efficiency were affected by the dispersions of liquid and oxygen gas in the trickle‐bed cathode and by the current density. Cur…
Metalloproteins perform a wide variety of biological functions and, in doing so, in many cases exploit the redox properties and the coordination chemistry of the metal atom. The structural changes associated with the different coordination and redox changes can be quite small and can only be visualized at a very high…
The new bimetallic nickel(II) compound (PPh4)4[Ni2(2)]·6H2O (3), where H8[2] stands for N,N′,N′′,N′′′-1,2,4,5-benzene-tetrayltetrakis(oxamic acid), has been synthesized and its crystal structure determined by single-crystal X-ray diffraction. The structure of 3 consists of [Ni2(η4:η4-2)]4– anions, tetraphenylphosphoni…
Aesthetic appearance is one of the most important criteria used by consumers in judging clothing wear performance. Bagging is a kind of three-dimensional residual deformation that deteriorates garment appearance during wear and causes dissatisfaction. To understand the psychophysical mechanisms of fabric bagging perce…
Electropolymerized cobalt salen compounds on pyrolytic graphite electrodes were first tested as oxygen reduction catalysts in aqueous solutions of various pH. N,N '‐Bis(salicylidene)ethylenediaminocobalt(II) [abbreviated Co(salen)] and its analogs were polymerized on a basal plane of pyrolytic graphite electrode by el…
In x-ray diffraction spectrometry as well as in the many other scientific, engineering and medical disciplines involving photon radiation, x-ray attenuation coefficients are required as input data. Within a very few years after the discovery of x-rays by Röntgen in 1895, the transmission of a narrow (parallel) beam of…
Simulations based on Cahn-Hilliard spinodal decomposition theory for phase separation in thermally quenched polymer/solvent/nonsolvent systems are pre- sented. Two common membrane-forming systems are studied, cellulose acetate (CA)/ acetone/water, and poly(ethersulfone) (PES)/dimethylsulfoxide (DMSO)/water. The ef- fe…
Imidazole-, 2-methylimidazole- and benzimidazole-blocked hexamethylene diisocyanate and isophorone diisocyanate have been prepared and characterized by elemental analyses, IR and NMR spectroscopy. The structure–property relationship of these adducts has been established by reacting with hydroxyl-terminated polybutadie…
In this investigation, a sugarcane agroecosystem at a coastal tableland, in the northeast of Brazil, was screened to obtain bacteria strains able to synthesize poly-<FONT FACE="Symbol">b</font>-hydroxyalkanoates (PHA), using sucrose as the main carbon source. The potential to synthesize PHA was tested qual…
An alloy series of single-phased polycrystalline ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Na}}_{x}{\mathrm{MnO}}_{3+\mathrm{\ensuremath{\delta}}} (0<~x<~0.15)$ has been synthesized in order to study the effect of disorder on the electronic properties of mixed valence manganites. The synthetic variables allow on…
Molecular dynamics (MD) simulation of lithium phosphate (Li 2 O−P 2 O 5 ) glasses with varying Li 2 O content has been carried out. Two different P O distances corresponding to phosphorus coordination with bridging oxygen (BO) and non-bridging oxygen (NBO) were identified in the simulated glasses. NBO−BO interconversi…
The total-energy calculations using a full-potential first-principles method have been performed for three displacive phase transformation modes in Cu. The structural and elastic properties of the ground-state (fcc) and higher-energy phases (bcc and $9R)$, as well as the energy barrier for sliding of ${111{}}_{\mathrm…
The genus Muelleria (Frenguelli) Frenguelli is considered in taxonomic, systematic, and biogeographic contexts. Muelleria is a small genus composed of 15 known species. In the present report, four species are newly described (M. algida S.A. Spaulding et Kociolek sp. nov., M. luculenta S.A. Spaulding et Kociolek sp. no…
High-yield single-wall carbon nanotubes (SWCNTs) have been produced in large quantity using a Y-Ni alloy composite graphite rod as anode in a dc arc discharge. Termination of the tubes was found to be the most common defect in the arc-discharge-produced SWCNTs. A comparison is made with samples produced by laser ablat…
A homologous set of alkylsilane-modified glass surfaces with chain lengths ranging from methyl to octadecyl was prepared in order to examine the influence of alkyl surface chemistry on macrophage adhesion and foreign body giant cell (FBGC) formation. Contact angle and X-ray photoelectron spectroscopy analysis confirme…
This paper treats the flow of an electrically conducting liquid in an insulating cylinder with a spatially uniform, transverse, rotating magnetic field. The frequency of the externally applied magnetic field is sufficiently low that this field penetrates throughout the liquid. Previous researchers have treated the ste…
ZnO thin films have been obtained by the sol-gel method from a Zn(OOCCH3)2 precursor on soda lime glass and silicon wafer substrates. The films, obtained by a single dipping procedure, were characterized by Fourier transform infrared (FTIR) and ultraviolet-visible (UV-vis) spectroscopies, atomic force microscopy, x-ra…