Materials Literature
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In our studies of the stability constants of metal complexes, we have investigated a number of macrocyclic ligands with pendant donor groups. The ligands are characterized by the fact that they have nitrogen donors in the macrocyclic ring and oxygen or sulfur donors in the pendant arms. These ligands represent seven d…
Analog zur Synthese von MCM–41 kann aus Zirconiumsulfat, das in Lösung mit Alkyltrimethylammoniumverbindungen versetzt wird, ein mesostrukturiertes Produkt (schematisch im Bild rechts) hergestellt werden. Nach Stabilisierung mit Phosphorsäure ist dieses Material calcinierbar, ohne daß die Struktur kollabiert. Das resu…
All the tert-butyl groups of [Er{N(tBu)[Si(CH3)2(H)]}3] (structure shown on the right) reside on the same face of the N3 plane, whereas all SiCH3 groups are rotated toward the periphery of the molecule. This results in ErH interatomic distances of 231.7–236.7 pm for the SiH moieties folded in toward the metal cente…
Possible point groups and elastic properties are discussed for a solid with two-dimensional quasiperiodic and one-dimensional periodic structures. The point groups and Laue classes are given for such structures with Fourier modulus of rank 5. The numbers of independent second-order elastic constants are calculated and…
The influence of microstructure of CuCr contact materials on dielectric strength in a vacuum is investigated. Experimental results show that breakdown selectively occurs on dielectrically weak phases. For the Cu50Cr50 alloy, it first takes place on Cr particles, and for the CuCr50Sel alloy, on the Cu/sub 2/Se phase. A…
Nutrients were extracted from samples of two Ohio soils derived from Wisconsin‐age glacial till, a Crosby silt loam (Aerie Ochraqualfs, fine, mixed, mesic) and a Hoytville silty clay (Mollic Ochraqualfs, fine, illitic, mesic) using the Mehlich‐3 extractant, and also using Bray‐1 for phosphorus (P) and ammonium acetate…
The quark delocalization and color screening model is used to study the N-N interaction of spin-isospin (00) and (11) channels. The predicted $^{1}$${\mathit{p}}_{1}$ phase shifts qualitatively fit the phase shift analysis of scattering data. The $^{3}$${\mathit{p}}_{\mathit{ls}}$ phase shifts are enhanced by the quar…
We have investigated the preparation concentration dependence of the polymer volume fraction and the elastic modulus of the equilibrium swollen polydimethylsiloxane networks in toluene. The networks were prepared by the end-linking method in solution with a wide range of concentration. The network samples were attempt…
High-resolution x-ray-diffraction data of natrolite at room temperature give by multipolar refinement an analytical expression of the electron density which permits the calculation of net atomic charges and electrostatic potential. The observed net charges show that the structural formula of natrolite may be written $…
The melting, crystallization and dynamic mechanical behaviour of blends of bacterially produced poly[D(–)-3-hydroxybutyrate] (PHB) and poly[D(–)-3-hydroxyvalerate] (PHV) have been investigated. Results showed that melt-pressed PHB–PHV blends contained phase-separated domains in the melt which subsequently crystallized…
Low temperature (<270 °C) plasma enhanced chemical vapor deposition (PECVD) of SiO2 thin films using tetraethylorthosilicate (TEOS) and O2 plasma was investigated. Depositions were carried out in a PECVD reactor with a helical resonator discharge source. Transmission infrared spectroscopy, spectroscopic ellipso…
The atomic structures of 25° and 45° asymmetric [001] tilt boundaries in SrTiO3 have been determined experimentally using the unique combination of high-resolution Z-contrast imaging and simultaneous electron-energy-loss spectroscopy in the scanning transmission electron microscope. These complementary techniques perm…
The aim of this investigation is the evaluation of DNA interaction of with tetraruthenated porphyrin (TRP) and of DNA damage in the presence of light. Direct-fluorescence and electronic absorption measurements after incubation of DNA with TRP indicate strong binding between pBR322 DNA or calf thymus DNA with the modif…
The present work was initiated in order to obtain a better understanding of the nucleation mechanism of cube oriented grains during recrystallisation of hot deformed aluminium. Investigations included: the stability aspect of cube oriented grains during deformation, a characterisation of cube oriented areas in the as…
This work presents an exhaustive mathematical model for the high pressure polymerization of ethylene in tubular reactors of configuration similar to that encountered in the industry. Multiple injection of monomer, mixtures of initiators and chain transfer agents are considered together with realistic flux configuratio…
Oxidation of the heteropolyanion [Mn4II(H2O)2(PW9O34)2]10− (0) with potassium persulphate yielded mixed valence MnII,III products reproducibly isolated as the green potassium salt of [Mn4(H2O)2(PW9O34)2]9− (1) and the brown potassium-caesium salt of [Mn4(OH)2(PW9O34)2]9− (2). Coulometric and single crystal X-ray struc…
To investigate in vitro platelet adhesion to hydrogels, using electron-beam irradiation, polymer reaction, and radical polymerization, hydrogels were synthesized to have a wide range of water content. The nonionic synthesized hydrogels include polyacrylamide (PAAm), poly(vinyl alcohol) (PVA), poly(ethylene glycol) (PE…
This study reports our first-year experience in the immunocytochemical staining of specimens prepared by the ThinPrep processor. The avidin-biotin-complex technique was applied to smears of 70 cytological specimens, including fine-needle aspiration samples from various sites (56 specimens), body fluids (13 specimens)…
Composite electrodes for solid oxide fuel cells were modeled by three‐dimensional resistor networks. The networks were generated on a computer by identifying neighbors in either cubic lattices randomly occupied by electrolyte or electrode particles, or in random packings generated by sequential deposition of such part…
Abstract The cure kinetics of an unsaturated polyester resin were studied by differential scanning calorimetry (DSC), and different dynamic and isothermal procedures were compared. It was established that the isothermal kinetic analysis through the isoconversional adjustment ln t = A + E/RT is the method that offers t…