Materials Literature
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Synthetic models of the photosynthetic antenna complexes must achieve long-range 3-dimensional order encompassing a large number of porphyrinic pigments with limited direct contact of the pigments. In order to develop solid-state antenna complexes, we have synthesized porphyrins bearing benzyloxy groups projecting ove…
The majority of polyurethanes are crosslinked thermoset polymers, which cannot be recycled by melting and extrusion processes without excessive degradation. Sev eral recycling techniques for polyurethanes have been described in technical and scientific literature and are used industrially, such as rebonding of flexibl…
A new method for predicting the deformation behaviour and the related mechanical properties of weft-knitted fabrics is presented. A two-dimensional hexagonal mechanical model is derived, which is based on the geometrical structure of plain-stitch fabric. An analytical method of converting the experimental data of the…
α-Aluminum bronze (Copper [Cu]-7% Al) (UNS C61400) was found to be susceptible to stress corrosion cracking (SCC) in 3.4% NaCl under relatively high anodic potentials (≥ 300 mVNHE), i.e., greater than 200 mV more positive than the free-corrosion potential. The time to failure and stress ratio (σ soln/σ air) were mildl…
This paper elaborates on a new approach introduced in an earlier paper for the steady-state and transient analysis of synchronous machines and demonstrates the validity and accuracy of this model for system studies. The approach is based on developing an equivalent flux linkage circuit model from the dimensions and ma…
The first well-characterised example of a heteropolymetalate involving palladium, [Pd2W10O36]8–, contains two W5O186–‘ligands’, each bridging between two four-coordinate palladium(II) ions in square-planar environments, defined by an X-ray crystal structure analysis.
A novel conjugated polyelectrolyte, poly(propynyltriphenylphosphonium bromide) has been synthesised using transition metal catalysts in quantitative yield.
We have developed theoretical models for analysis of X-ray diffuse scattering from protein crystals. A series of models are proposed to be used for experimental data with different degrees of precision. First, we propose the normal mode model, where conformational dynamics of a protein is assumed to occur mostly in a…
This paper concerns transient sorption measurements in two intervals (54 to 75% and 75 to 84% relative humidity) made on samples of pine, spruce, ash, aspen, cherry, and willow, with the flow in different directions.In the lower interval, the sorption behavior is quite Fickian; but in the higher interval, it is largel…
Chemical stabilization of β‐cristobalite has been achieved using two methods: (1) incorporating “stuffing” cations Na, Ca, Cu, and Sr into the cavities in the tectosilicate framework, as previously reported, and (2) without “stuffing” cations, by substituting AlPO 4 into the framework. XRD, TEM, FTIR, DSC, and solid‐s…
The layered compounds, KMP2Se6(M = Sb, Bi), have been prepared by the reaction of Bi(Sb) with a molten alkali-metal polyselenophosphate flux.
Within the local spin density approximation (LSDA) of density functional theory, calculations of both the diagonal and off-diagonal conductivity of NiMnSb and PtMnSb are presented. The similar electronic structures of these two materials yield similar diagonal conductivities while the larger spin-orbit coupling of Pt…
With a view to studying the optical, structural and magnetoelectric properties, single crystals of the hausmannite CuCr2O4 have been grown by a high temperature solution method, based on the thermal decomposition of K2Cr2O7 in the presence of CuO. X-ray powder refinements at room temperature indicate that the crystal…
Soils suppressive to Thielaviopsis basicola typically have low pH values and high levels of exchangeable aluminum (Al). A series of experiments was conducted to determine the sensitivity of T. basicola to Al. All experiments were conducted in Al-amended carrot agar medium buffered at pH 5.0, except for experiments to…
The problem of modifying the harmonic power flow analysis to permit the inclusion of nonlinear anisotropic transformers and computation of their iron-core (and copper) losses are discussed. The nonlinear model used for transformers is capable of simulating saturation of iron-cores, anisotropy of laminations, and the i…
The syntheses of four chiral laterally fluoro-substituted propiolate esters are described, along with transition temperatures, ferroelectric properties, phase diagrams and related data. The position of the fluoro-substituent was found to influence dramatically the formation of twist grain boundary (TGB A* and TGB C*)…
Silicon nitride was produced via direct nitridation of silicon powder, using nitrogen with 10–40 vol% hydrogen, in a fluidized‐bed reactor, 55 mm in diameter, operated at temperatures in the range of 1200–1390°C. Hydrogen enhanced the nitridation of silicon toward its completion. The overall conversion of silicon as w…
Abstract The crystal structures of two complexes of the 9-(9H-fluoren-9-ylidenephenylmethyl)-9H-fluoren-9-yl stable radical with benzene (BDPA–Bz) and acetone (BDPA–Ac) have been determined by X-ray diffraction at room temperature. They are an isostructure of a monoclinic system with a space group of P21/n. For BDPA–B…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew mono- and dinuclear titanium(III) complexes. The crystal structure of and exchange coupling in [{LTiIII(NCO)2}2(.mu.-O)] (L = 1,4,7-trimethyl-1,4,7-triazacyclononane)Peter Jeske, Karl Wieghardt, and Bernhard NuberCite this: Inorg. Chem. 1994, 33, 1, 47–53Publication Date…
Any discussion about “mesophases” and, especially, about “liquid crystals” might be thought of as dealing with only a marginal field of science. However, liquid crystals have in actuality become a consumer product with many everyday applications, substantiated by several examples in Chapter 6 as well as in Section 4.7…