Materials Literature
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An approach to plotting hysteresis curves of soft magnetic materials using a personal computer assisted measuring system is presented. The resulting hysteresis curves provide enough detail to allow determination of the parameters required for a simulation with PSPICE (Jiles-Atherton model) or the Hodgdon/Carpenter mod…
Thin films of CdSe were deposited by a chemical bath technique from citratocadmium(II) or tartratocadmium(II) complex ions and N,N-dimethylselenourea. The final thicknesses of the films were from the citrate bath and from the tartrate bath, when the depositions were made at room temperature. The films are uniform and…
The plasma characteristics of a new arc mode on carbon referred to as the ‘‘stationary cathodic arc’’ are reported. Particularly, optical emission spectroscopy, probe and ion energy distribution measurements are used to compare the properties of the stationary arc with the normal ‘‘random cathodic arc’’ on carbon. The…
For near-α titanium alloys IMI 834 and TIMETAL 1100 oxidation behaviour was investigated as a function of microstructure. Isothermal thermogravimetry was performed at 750°C for 100 h in air. The morphologies and compositions of the scales produced were examined using scaninng and analytical electron microscopy and X-r…
Eight-coordination and identical ligand environments have been unequivocally established in the pair of stable iron(II) and iron(III) complexes shown on the right. The synthesis, structures and electrochemical properties of these iron complexes are presented here, together with some Mössbauer spectroscopic data on the…
Abstract A previously developed mathematical wetting model is generalized and applied to the following two closely related situations: the spreading of a liquid over a prewet solid surface and the receding contact‐line motion with a microscopic residual film, remaining behind the contact line. An analytical expression…
Abstract Here we report on investigations that have revealed for the first time that the Cs + ion templates the same metal germanium sulfide open‐framework as (CH 3 ) 4 N + (TMA + ), and that metal complexing agents enhance crystal size by at least two orders of magnitude. The synthesis, structures and thermal propert…
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…